巴西专利BR102013004927B1 GAS CYLINDER ACTUATOR WITH OVERRIDE SAFETY DEVICE

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专利摘要:
gas cylinder actuator with safety device against overdrive a gas cylinder actuator (10) with safety device against overdrive, comprising a tubular housing (11) for charging gas which is hermetically closed at one end by a base (12 ), provided with a gas charging valve (13), and at the opposite end, by a head portion (14), which is provided with a hole for the passage of a rod (15) with a piston (16), the casing, the base and the piston forming a gas expansion and compression chamber (17). the head portion (14) comprises an annular body (18), which is fixed internally to the casing (11), and is provided with a central hole (19) for the passage of the rod (15), with the interposition of means of dynamic sealing (21) and static sealing means being interposed between the annular body (18) and the housing (11), and with an element (20) for controlling the downward movement of a slide(s) of a press with the which the actuator (10) is associated with being provided, and projecting from the annular body, or from the housing, the control element (20) being preset to selectively move, or brake, or deform, to brake or deform or render ineffective, in general static and dynamic sealing means.
公开号:BR102013004927B1
申请号:R102013004927-1
申请日:2013-02-28
公开日:2021-07-20
发明作者:Augusto Cappeller；Alessandro Cappeller；Dante Cappeller
申请人:Special Springs S.R.L.；
IPC主号:

专利说明:

[0001] The present invention relates to a gas cylinder actuator with safety device against overtaking.
[0002] Gas cylinder actuators are generally formed by a tubular housing, for gas charging, hermetically closed at one end by a base provided with a gas filling valve and, at the opposite end, by a head portion provided with a hole for the passage of a rod with a piston, which translates inside said casing; the casing, the base and the head portion form the piston stroke compartment, while said piston, with the casing and the base, forms the chamber for gas compression and expansion.
[0003] These gas cylinder actuators are typically, but not exclusively, used for devices such as punches, molding presses etc., in which they may be subject to high internal pressure or impact situations with associated parts of a press or a punch, so that they can be damaged; this damage may cause said gas cylinder actuator to become unusable, requiring replacement and shutdown of the machine or system in which it is put to work, but may be such as to cause injury to an operator in its vicinity, as in the case of explosion due to an uncontrolled increase in pressure.
[0004] One of the reasons that lead mainly to such damage is what is called piston overshoot, that is, a stroke of retraction of the rod with the piston that is greater than what is allowed from a constructive point of view for this specific gas cylinder actuator.
[0005] This overshoot can be caused, for example, by an unexpected increase in the load on the actuator stem, which forces said stem to retract into the actuator body over an unexpected length, causing an internal actuator overload that can be unsustainable for the actuator structure as a whole.
[0006] The actuator may thus bend or break at the connection points between its component parts, or its sealing elements may fail and, in all these cases, an unexpected, unwanted and dangerous rapid gas leak may to occur.
[0007] To prevent the occurrence of these dangerous situations of overtaking, gas cylinder actuators have been provided comprising safety devices designed for the controlled and safe escape of pressurized gas in case of overtaking.
[0008] For example, European patent EP 959,263B1 in the name of Orflam Industries, with priority dated May 22, 1998, discloses and claims a device with a compressible fluid comprising a compression chamber containing compressible fluid, and a piston which can be moved within said compression chamber in a first direction to compress said compressible fluid, and in a second direction, opposite to the first, in response to a force of the compressed fluid, the device comprising a safety element arranged in so as to be impacted by the piston if it makes an accidental displacement that exceeds a nominal preset displacement, said safety element being preset to cause the discharge of the compression chamber when impacted by the piston.
[0009] A safety device for gas cylinder actuators is described and claimed in Italian patent application PENDULUM 2007 A 378, dated November 3, 2007, in the name of the same Applicant of the present application, Special Springs s.r.l.
[0010] This safety device is characterized in that it comprises, associated with the base or casing of a gas cylinder actuator, a breakable partition subject to the pressure produced by the compressed gas inside a compression and expansion chamber of an actuator of gas cylinder, said breakable partition being associated with a longitudinally extended element that extends in said compression and expansion chamber in order to affect part of said piston during its descent, before it makes a displacement that exceeds the predefined displacement (ie an overdrive); the longitudinally extended element is supported by flexible support means which are adapted to allow, in the presence of a pre-set thrust of the piston on said longitudinally extended element, for it to move so as to break said partition, opening a path of outlet to the outside for gas.
[0011] Both safety systems cited for gas cylinder actuators, despite being effective, have disadvantages.
[0012] A first disadvantage is linked to the fact that both technical solutions provide the rupture of a part that is designed to allow the controlled escape of pressurized gas.
[0013] Therefore, to restore the full functionality of said gas cylinder actuator, the part needs to be replaced, consequently requiring labor and spare parts.
[0014] Another disadvantage lies in the fact that the provision of the aforementioned preset parts to break has to be extremely precise, since it is essential that these parts break exactly under the pre-set tension.
[0015] Otherwise, if the parts preset to break do not break in the presence of the design loads, if they break with loads less than the design values, the gas cylinder actuator would not be safe.
[0016] Furthermore, in said known gas cylinder actuators, the parts designed to break in the event of overtaking are arranged inside the gas cylinder actuator and, therefore, any breakage of them is not immediately visually detectable.
[0017] The purpose of the present invention is to provide a gas cylinder actuator with a safety device against overtaking, capable of eliminating the disadvantages revealed by gas cylinder actuators and safety devices that are very simple to be readjusted in the event of overtaking .
[0018] Another objective of the invention is to provide a gas cylinder actuator in which the activation of the safety device is easily visible, even from the outside of said gas cylinder actuator.
[0019] Another objective of the invention is to provide a gas cylinder actuator with safety device that is no less efficient and safe than known gas cylinder actuators.
[0020] Another objective is to propose a gas cylinder actuator with an overrun safety device that is structurally simple and easy to use and that can be manufactured with known systems and technologies at low cost.
[0021] In order for this and other objectives to become more apparent below, they are achieved by a gas cylinder actuator with a safety device against overtaking, comprising a tubular casing for gas containment, which is hermetically closed at one end by a base provided with a gas filling valve and, at the opposite end, by a head portion provided with a hole for the passage of a rod with a piston, said casing, said base and said piston forming the expansion chamber and gas compression, said gas cylinder actuator being characterized in that said head portion comprises an annular body, which is fixed internally to said casing, and is provided with a central hole for the passage of said rod, with the interposition of dynamic sealing means, static sealing means being interposed between said annular body and said casing, and an element for controlling the downward movement of a slide of a press with which the actuator is associated, being provided and projecting from said annular body or said casing, said control element being preset to selectively move or break or deform , so as to break or deform or render ineffective in general said static and dynamic sealing means.
[0022] Other characteristics and advantages of the invention will become more apparent by the description of seven preferred embodiments, but not exclusive, of the gas cylinder actuator, with safety device against overtaking of the invention, illustrated as non-limiting examples in the attached drawings , in which:
[0023] Figure 1 is a side view in section of a gas cylinder actuator according to the invention, in a first embodiment thereof;
[0024] Figure 2 is a view of a detail of Figure 1;
[0025] Figure 3 is a view of the actuator of Figures 1 and 2 in an overtravel situation;
[0026] Figure 4 is a view of a detail of Figure 3;
[0027] Figure 5 is a perspective view of some components of the gas cylinder actuator according to the invention, and its first embodiment;
[0028] Figure 6 is a side view in section of a gas cylinder actuator according to the invention, in a second embodiment thereof;
[0029] Figure 7 is a detail view of Figure 6;
[0030] Figure 8 is a view of the same detail as Figure 7 in an overstepping situation;
[0031] Figure 9 is a side sectional view of a portion of a gas cylinder actuator according to the invention in a third embodiment thereof;
[0032] Figure 10 is a detail view of Fig. 9;
[0033] Figure 11 is a view of the same detail as Figure 10, in an overdrive situation;
[0034] Figure 12 is a view of a detail of a gas cylinder actuator according to the invention in a variation of the third embodiment;
[0035] Figure 13 is a side sectional view of a gas cylinder actuator according to the invention in a fourth embodiment thereof;
[0036] Figure 14 is a detail view of Figure 13;
[0037] Figure 15 is a view of the same detail as Figure 14, in an overdrive situation;
[0038] Figure 16 is a side view in section of a gas cylinder actuator according to the invention in a fifth embodiment thereof;
[0039] Figure 17 is a view of a detail of Figure 16;
[0040] Figure 18 is a sectional side view of the gas cylinder actuator of Figure 16 in an overdrive situation;
[0041] Figure 19 is a view of a detail of Figure 18;
[0042] Figure 20 is a view of the gas cylinder actuator of Figure 16 in a different critical situation;
[0043] Figure 21 is a view of a detail of Figure 20;
[0044] Figure 22 is a cutaway view in perspective of a gas cylinder actuator according to the invention in a sixth embodiment;
[0045] Figure 23 is a sectional side view of a gas cylinder actuator according to the invention in a seventh embodiment;
[0046] Figures 24 and 25 are sectional and perspective views of a gas cylinder actuator according to the invention in a variation of the first embodiment.
[0047] With reference to the Figures, a gas cylinder actuator with overrun safety device according to the invention is designated, in its first embodiment shown in figures 1 to 5, by the number 10.
[0048] The gas cylinder actuator 10 comprises a tubular housing 11 for gas containment, hermetically closed at one end by a base 12 provided with a gas filling valve 13, and at the opposite end by a head portion 14, provided with a hole for the passage of a rod 15 with a piston 16.
[0049] The casing 11, the base 12 and the piston 16 form the gas expansion and compression chamber 17.
[0050] The head portion 14 comprises an annular body 18 fixed within the housing 11, with a central hole 19 for the passage of the rod 15 with the interposition of the dynamic sealing means 21, described in more detail below.
[0051] Static sealing means 22, also described in more detail below, are interposed between the annular body 18 and the casing 11.
[0052] An element 20 for controlling the downward movement of a slide S of a press with which the gas cylinder actuator 10 is associated protrudes from the annular body 18.
[0053] The control element 20 is designed to move into the gas cylinder actuator 10, under the thrust of the slide S, so as to render the static sealing means 22 ineffective.
[0054] In this first embodiment of the gas cylinder actuator, according to the invention 10, the dynamic sealing means 21 are constituted, for example, by a rod scraper ring 23, a gasket 25 and a band of orientation of the rod 24, each accommodated within a corresponding annular slot 26, 27 and 28.
[0055] The static sealing means 22 are constituted, again as a non-limiting example of the invention, by a static annular gasket 29.
[0056] The static annular gasket is arranged in a corresponding annular slot 30.
[0057] In this first embodiment of the gas cylinder actuator 10 according to the invention, the control element 20 is constituted by a rod, which has a conical or partially conical tip and is arranged in a complementary seated shape 31, which is formed between the annular body 18 and the casing 11 so as to protrude in the direction of the axis of the rod 15.
[0058] The seat 31 extends in the direction of the main shaft of the gas cylinder actuator 10, into the vicinity of the slot 30 to the static gasket 29.
[0059] The seat 31 and the slit 30 are separated by a relieved partition 32 which is designed to be pierced by a tip 33 of the control element 20 when the latter is pushed down by an improper descent of the slide S, as shown in the examples in Figures 3 and 4.
[0060] The detail of Figure 4 clearly shows that the tip pierces the divider 32, which, in turn, is pushed against the static gasket 29.
[0061] The static gasket 29 is thus pushed from a precise static sealing position, or damaged, producing an escape path for the overpressurized gas 25 within the chamber 17.
[0062] In a variation of the first embodiment, the relieved partition 32 is absent and the tip operates directly on the static gasket 29.
[0063] This variation is shown in Figures 24 and 25.
[0064] In Figure 5, the control element 20 has two side projections 34 and 35, designed to engage with the slot 30 of the static gasket 29, during the downward movement of the control element 20; the side projections 34 and 35, once they are inside the slit 30, prevent the control element 20 from returning upwards, subjected to the thrust of the pressurized gas impulse.
[0065] The backflow prevention allows the uninterrupted discharge of gas from chamber 17.
[0066] The annular body 18 is coupled with the housing 11 by means of a metal extraction prevention ring 40.
[0067] Figures 6 to 8 illustrate a second embodiment of the gas cylinder actuator according to the invention, generally designated by the reference numeral 110.
[0068] In this second embodiment of the gas cylinder actuator according to the invention 110, dynamic sealing means 121 are constituted, for example, by a rod scraper ring 123, a gasket 125 and a band of orientation of the rod 124, each accommodated within a corresponding annular slot 126, 127 and 128.
[0069] The static sealing means 122 are constituted, again, as a non-limiting example of the invention, by an elastic ring 129 which is arranged inside a corresponding annular slot 130.
[0070] In this second embodiment of the gas cylinder actuator 110, according to the invention, the control element 120 is constituted by a shutter that is screwed on the surface 141 of the housing 111 that is directed towards the direction of the slide S ; the control element 120 blocks a safety discharge hole 142, which is formed in the housing 111, and connects the chamber 117 with the outside.
[0071] The control element 120 has a cavity 143 that extends in the direction of the main axis of the shutter.
[0072] The cavity 143 substantially consists of a dead hole which ends in the head 145 of the obturator.
[0073] The cavity 143 substantially consists of the dead hole ending in the head 145 of the obturator.
[0074] The control element 120, once it is installed over the housing 111, extends in the direction of the overlying slide S.
[0075] The height H, with which the control element 120 projects from the housing 111, is such that it actually affects the slide S in its downward movement before causing the retraction of the piston rod 115 within of chamber 117, beyond the limits of the drawing.
[0076] The cavity 143 is intended to facilitate a disruption of the control element 120 when it is impacted by the downward slide S, and at the same time it is intended to promote the disruption, as shown in Figure 8, and connect the safety discharge hole 142 with the outside.
[0077] The discharge element 120 is of course designed to withstand the pressure of the gas that is present within the chamber 117.
[0078] Figures 9 to 12 illustrate a third embodiment of the gas cylinder actuator according to the invention, designated herein by reference numeral 210.
[0079] In this third embodiment of the gas cylinder actuator according to the invention 210, the dynamic sealing means 221 are constituted, for example, by a rod scraping ring 223, a gasket 225 and a band of rod orientation 224, each accommodated in a corresponding annular slot 226, 227 and 228.
[0080] The static sealing means 222 are constituted, again by way of non-limiting examples of the invention, by an elastic ring 229 arranged in a corresponding annular slot 230.
[0081] In this third embodiment of the gas cylinder actuator 210, according to the invention, the control element 220 is constituted by a shaped bushing, which is interposed between the piston rod 215 and the annular body 218, of the head portion 214 of gas cylinder actuator 210.
[0082] The shaped bushing has an end portion 250 which projects in the direction of the main axis of the gas cylinder actuator 210 towards the overlying slide S, from which excessive downward movement must be controlled.
[0083] The control element 220 is free to slide between the annular body 218 and the piston rod 215, towards the interior of the gas cylinder actuator 20.
[0084] The control element 220 has a first shoulder 251, for rest and compression of the sealing ring 252, which is pressed between the first shoulder 251 and the opposite second shoulder 253, formed in the annular body 218.
[0085] As shown in Figure 11, when the slide S pushes the control element 220 into the actuator of the gas cylinder 210, the first shoulder 251 moves down, and the sealing ring 252 is no longer compressed. between the two shoulders, the first 251 and the second 252, with the consequence that the over-pressurized gas within the chamber 217 can find an escape path, between the annular body 218 and the control element 220.
[0086] The seal ring 252, for example, is made of a vulcanized rubber.
[0087] The control element 220 is made of a metallic material or, alternatively, of a rigid plastic material.
[0088] In the present constructive example, the annular slots, 226, 227 and 228, for the dynamic sealing means 221, are provided with a shaped bushing, which forms the control element 220.
[0089] Figure 12 illustrates, by way of example, a variation of the mentioned third embodiment of the gas cylinder actuator, according to the invention, here designated by the reference number 310.
[0090] In this variation, the control element 320 is constituted by a shaped bushing, which is also made of non-metallic material, suitable for applying a dynamic seal on the piston rod 315.
[0091] The control element 320, for example, is made of a rigid plastic energized material.
[0092] In this way, the rod scraper ring, the gasket and the rod guide ring are not present as in the embodiments of the invention described above.
[0093] Figures 13 to 15 illustrate a gas cylinder actuator, according to the invention, in a fourth embodiment, herein designated by reference number 410.
[0094] In the gas cylinder actuator 410, the annular body 418 comprises a first upper part 418a and a second lower part 418b, which are shaped to accommodate an oscillating body 460 that is externally shaped as a spherical segment.
[0095] At least one point of the upper edge 461 of the oscillating annular body 460 is in contact with a control element 420, which is contoured to protrude at an angle from the head portion 414 to affect the cursor S, in case of an improper descent of the last one.
[0096] The inner surface 462m of the oscillating annular body 460 also has an arc-shaped cross section, which is convex towards the main axis of the gas cylinder actuator.
[0097] The static sealing means 442 are constituted by two sealing rings, a first outer 464 and a second inner 465, the first normally in contact with the inner surface of the housing 411, the second normally in contact with the outer surface of the inner portion 466 of the second lower portion 418b of the annular body 418.
[0098] The descent with passing of the slide S causes with the compression of the control element 420, which pushes a limited region of the oscillating annular body 460; said body tilts, due to the geometry of its outer surface and its inner surface, eliminating the sealing effect of the outer static sealing ring 464, and that of the inner static sealing ring 465, as shown in Figure 15.
[0099] The control element 420 is made of high-density polyurethane, and when compressed by the slide S, it deforms and enters the interstices, which are provided between the piston rod 415 and the parts 418a and 418b of the annular body 418 .
[00100] The disengagement of the sealing rings 464 and 465 causes the gas flow in over pressurization, and the protection of the gas cylinder actuator.
[00101] Figures 16 to 21 are views of a gas cylinder actuator, according to the invention, in a fifth embodiment, designated herein by reference number 510.
[00102] The gas cylinder actuator 510, with safety device against overtaking, comprises a tubular housing 511 for charging gas, which is hermetically closed at one end, by a base 512, provided with a gas filling valve 513 and, at the opposite end, with a portion 514, which is provided with a hole for the passage of a rod 515 with a piston 516, said housing and said piston forming a gas compression and expansion chamber 517.
[00103] The particularity of the mentioned gas cylinder actuator 510 lies in the fact that the static sealing means are located between the base 512 and the inner surface 570 of the housing 511, which surrounds the base 512.
[00104] The static sealing means are constituted by a sealing ring 571 which is accommodated in a corresponding annular slot 572 which is formed perimetrically with the base 512.
[00105] The attachment of the base 512 to the underside of the housing 511 is provided by means of a locking ring 573 which is partially inserted into a first slot 574, provided on the inner surface of the housing 511 and partially supported against the corresponding shoulder 575 provided on the outside of the base 512, said pull-out preventer shoulder 575 being adapted to retain the base 512 within the housing 511 when the gas cylinder actuator is loaded and thus in operation.
[00106] Proximal to shoulder 575, at the opposite end of locking ring 573, in an axial direction, is a relief slot 577 which is adapted to make shoulder 575 breakable.
[00107] The lower edge 580 of casing 511, which is resting on the contact, has a reduced cross section, so that it is capable of deforming in a controlled manner if subjected to a load by the slide S.
[00108] In this fifth embodiment the gas cylinder actuator according to the invention 510, the control element 520 is the housing 511 itself.
[00109] When the slide S overtakes in a downward movement, it impacts the casing 511, which is elastically deformed by the compression of its lower edge 580, which rests in the contact, while the base 512 remains in its original position.
[00110] The deformation by compression of the lower edge 580 causes the movement of the casing 511 and, therefore, of its internal surface 570, in relation to the base 512.
[00111] This movement causes, as shown in Figure 19, the separation, at least partially, of the sealing ring 571 from the inner surface 570 of the housing 511, with the consequent generation of an escape path, for the gas in over pressurization, inside the 510 gas cylinder actuator.
[00112] The fifth embodiment of the gas cylinder actuator 510 according to the invention also has an additional safety system for the case of a so-called uncontrolled return situation, i.e. with the rod pushed up abnormally.
[00113] If the shoulder of piston 516 of rod 515 impacts the corresponding point of contact to prevent extraction 590 inside casing 511, due to an excessively fast upward movement, this will cause, as shown in Figures 20 and 21, failure of the shoulder 575 in retaining the locking ring 573, with the consequent suspension of the casing 511 in relation to the base 512, and separation, at least partially, of the sealing ring 571 and the inner surface 570 of the casing 511, with the consequent generation of an exhaust path, for the over-pressurized gas, within the 510 gas cylinder actuator.
[00114] Figure 22 is a perspective view of a cutout of a gas cylinder actuator, according to the invention, in a sixth embodiment, which is here designated by the reference number 610.
[00115] In the aforementioned sixth embodiment, the control element 620 is constituted by a pointed rod, arranged in a complementary shaped seat, which is formed between the annular body 618 and the casing 611, so as to project in the direction of a shaft of the rod 615.
[00116] Said seat extends in the direction of the main shaft of the gas cylinder actuator 610, up to the vicinity of the slot 630 of the static gasket 629.
[00117] The seat and gasket 630 are separated by a relieved partition 632, designed to be pierced by the tip of the control element 620, when it is pushed down by improperly lowering the slide S.
[00118] In this embodiment, below the gasket 629, in the relieved partition 632 and on the opposite side to the latter, relative to the gasket 629, there is in the annular body 618 an opening 690 of the slot 630 that is directed downwards, and is adapted to expedite and extend the disengagement of the gasket 629 when it is subjected to the operation of the control element 620.
[00119] Gasket 629, pushed down by control element 620 in its downward movement, in fact deforms and enters, with one of its portions, opening 690, deforming more than in the absence of opening 690, creating, in this way, a larger escape path for the pressurized gas.
[00120] Figure 23 illustrates a gas cylinder actuator according to the invention in a seventh embodiment, here designated by reference number 710.
[00121] In this embodiment, below the inner surface band 791 of the housing 711, against which the gasket 729 is pressed, when the gas cylinder actuator is in operation, there is a perimeter inset 792, for example, a notch.
[00122] Perimeter inset 792 facilitates separation of gasket 729 from inner surface 791 when control element 720 becomes active and pushes gasket 729 downward.
[00123] In practice it has been found that the invention achieves its intended aims and objectives.
[00124] In particular, the invention provides a gas cylinder actuator with a safety device against overtaking, which is simple to be reconfigured if an overtake occurs. If the control element is intact, it is, in fact, sufficient to replace the gasket that was destroyed by it, or if the control element has been permanently deformed, or broken, it is sufficient to replace it, these operations being anyway , easy and cheap.
[00125] Furthermore the invention provides a gas cylinder actuator in which the activation of the safety device is easily visible from outside said gas cylinder actuator, such as, for example, in the case of the first mode of embodiment described above, in which the control element 20 has lateral projections 34 and 35, which, once being in the slit 30, prevent the return to the top of the control element 20, submitted to the thrust of the pressurized gas and, in this way, once the control element 20 has been pushed into the housing 11, it no longer leaves it, disappearing from view and providing a clear visual indicator that overtaking has occurred.
[00126] Furthermore, the gas cylinder actuator, according to the invention, if an associated press, or an associated mold, or other equipment, to which the gas cylinder actuator has been applied, impacts the actuator itself , causing ruptures in it, in order to allow an ejection of the piston rod, the aforementioned piston rod must have already been subjected, when the rupture occurs, to a relatively weak thrust, thanks to the fact that the gas in over pressurization, in the meantime, it bled through the escape paths produced by the fact of the intervening stagnation of the sealing means.
[00127] Furthermore, the present invention provides a gas cylinder actuator with a safety device that is no less efficient and safe than known gas cylinder actuators.
[00128] Last but not least, the invention provides a gas cylinder actuator with a safety device against overtaking, which is structurally simple and easy to use, and which can be manufactured using systems and technologies already known, and at low costs.
[00129] The invention conceived in this way is susceptible to various modifications and variants, all of which fall within the scope of the appended claims; all the details can also be replaced by other technically equivalent elements.
[00130] In practice, the materials used, as well as the shapes and dimensions, can be any, according to the requirements and the state of the art.

权利要求:
Claims (11)
[0001]
1. A gas cylinder actuator (10, 210, 610, 710) with an overrun safety device, comprising a tubular housing (11, 111, 411, 511, 611, 711), for containing gas, which is hermetically sealed in one end by a base (12, 512) provided with a gas filling valve (13), and at the opposite end by a head portion (14, 214, 414) which is provided with a hole for the passage of a rod (15, 115, 615) with a piston (16), said casing, said base, and said piston forming a gas compression and expansion chamber (17, 117), characterized in that the head portion (14, 114, 214, 414) comprises an annular body (18, 218, 418, 618), which is fixed internally in said casing (11, 111, 411, 511, 611, 711), and is provided with a hole center (19) for the passage of said rod (15, 115, 615) with the interposition of dynamic sealing means (21), static sealing means (22) being interposed between said co. annular rpo (18) and said casing (11), and a control element (20, 120, 220, 320, 420, 520, 620) for controlling the downward movement of a slide (S) of a press with which the actuator (10, 210,610, 710) is associated, being provided and projecting from said annular body or from said casing, being said control element (20, 120, 220, 320, 420, 520, 620) being a separate element from said annular body (18; 218; 418; 618) and being adapted to be pushed or held by said slide (S) and preset to selectively move or brake or deform, to brake or deform or render ineffective, in general, said static and dynamic sealing means.
[0002]
2. A gas cylinder actuator, according to claim 1, characterized in that the control element (20) is constituted by a rod that is arranged in a complementary shaped seat (31) formed between the annular body ( 18) and the casing (11), in order to project in the direction of the axis of the rod (15), reaching the mentioned seat (31) a slot (30) for a static sealing gasket (29), having the tip ( 33) of said control element (20) the purpose, when it is pushed down by the descent of a slide (S), to move the static gasket (29), from its precise static sealing position, to damage it, generating an escape path for the gas from the interior of the chamber (17).
[0003]
3. Gas cylinder actuator, according to claim 2, characterized in that said control element (20) has two side projections (34, 35), which are designed to engage the gasket slot (30) static (29), during the downward movement of the control element (20), preventing the rise of the latter and allowing the continuous discharge of gas from chamber (17).
[0004]
4. Gas cylinder actuator, according to claim 1, characterized in that said control element (120) is constituted by a shutter, which is screwed on the surface (141) of the casing (111) which is directed for a slide (S) of a punch or a press, with which the gas cylinder actuator is associated, said control element (12) blocking the safety vent hole (142) formed in the housing (111) , said hole (142) connecting the chamber (117) and the outside, said control element (120) having a cavity (143) extending in the direction of the main axis of said shutter, the height (H), by the which control element (120) protrudes from the casing (111), being such that it affects a slide (S) in its downward movement, before said slide causes a retraction of the piston rod (115) within the chamber (117), beyond the design boundary, the aforementioned cavity (143) having the purpose of to prevent the breakage of the control element (120) when it is impacted by the slide (S) and for the purpose of ensuring that the breakage connects the safety vent hole (142) with the outside.
[0005]
5. Gas cylinder actuator, according to claim 1, characterized in that said control element (220) is constituted by a shaped bushing, which is interposed between the piston rod (215) and the annular body (12) of the head portion (214) of the gas cylinder actuator (210), said shaped bushing having an end portion (250) which projects towards the main shaft of the gas cylinder actuator (210), at the direction of an overlying slide (S), said control element (22) being free to slide between the annular body (218) and the piston rod (215) towards the interior of the gas cylinder actuator (210), said control element (220) having a first compression and rest shoulder (251) for a sealing ring (252) which is designed to be pressed between the first shoulder (251), and opposite a second shoulder (253) , formed in the annular body (218).
[0006]
6. Gas cylinder actuator according to claim 5, characterized in that the annular slots (226, 227, 228) for the dynamic sealing means (221) are provided in the shaped bushing, which forms the element of control (220).
[0007]
7. Gas cylinder actuator, according to claim 5, characterized in that said control element (320) is constituted by a shaped bushing that is directly made of a non-metallic material adapted to provide a dynamic sealing of a piston rod (315).
[0008]
8. Gas cylinder actuator according to claim 1, characterized in that said annular body (418) comprises a first upper part (418a) and a second lower part (418b), which are shaped to accommodate a annular swinging body (460), at least one point of the upper edge (46a) of the annular swinging body (460) being in contact with a control element (420) which is shaped to protrude at an angle from the head portion (414) to affect a slider (S) in case of improper descent of the head; the static sealing means (422) comprises two sealing rings, a first outer (464) and a second inner (465), the first normally in contact with the inner surface of the housing (411), the second normally in contact with the outer surface of the inner portion (466) of the second lower part (418b) of the annular body (418), an overrunning descent of the slider (S) causing compression of the control element (420), which is adapted to push on a limited region is the oscillating annular body (460) which, by tilting, removes the sealing effect of the outer (464) and inner (465) static sealing rings.
[0009]
9. A gas cylinder actuator, according to claim 1, characterized in that it has static sealing means that are arranged between the base (512) and the inner surface (570) of the casing (511), which surrounds said base (512), said sealing means being constituted by a sealing ring (571), which is accommodated in a corresponding annular slot (572) formed perimetrically in relation to said base (512), fixing the base ( 512) in said lower part of the casing (511) being provided by means of a locking ring (573), which is partially inserted into a first slot (574), provided on the inner surface of the casing (511) and partially supported against a corresponding pull-out prevention shoulder (575), provided on the outer side of the base (512), said pull-out prevention shoulder (575) being adapted to retain the base (512) within the housing (511), the lower edge ( 580) of the casing (511), which is in standby contact so, having a reduced cross-section, in order to be able to deform in a controlled manner, when subjected to a load by the slide (S), said control element (520) being constituted by the casing itself (511), the deformation by compressing the lower edge (580) causing the movement of the casing (511) and, thus, of its inner surface (570) in relation to the base (512), with at least a partial separation of the sealing ring (571) of the inner surface (570) of the housing (511).
[0010]
10. A gas cylinder actuator according to claim 9, characterized in that, proximal to the shoulder (575), on the opposite side of the locking ring (573), in an axial direction, there is a relief slit ( 577), which is adapted to make the shoulder (575) breakable, the shoulder failure (575) to retain the locking ring (573) allowing the suspension of the casing (511) relative to the base (512), and the fur less partial separation of the sealing ring (571) from said inner surface (570) of the housing (511).
[0011]
11. Gas cylinder actuator according to claim 1, characterized in that said control element (620) is

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法律状态:
2015-06-23| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|

2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

2020-08-11| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

2021-06-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

2021-07-20| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/02/2013, OBSERVADAS AS CONDICOES LEGAIS. |

2021-10-19| B16C| Correction of notification of the grant [chapter 16.3 patent gazette]|Free format text: REF. RPI 2637 DE 20/07/2021 QUANTO AO QUADRO REIVINDICATORIO. |

优先权:

申请号 | 申请日 | 专利标题

ITPD2012A000057|2012-03-01|

IT000057A|ITPD20120057A1|2012-03-01|2012-03-01|GAS SPRING WITH SAFETY DEVICE FOR EXTRACTION|

IT000194A|ITPD20120194A1|2012-06-18|2012-06-18|GAS SPRING WITH SAFETY DEVICE FOR EXTRACTION|

ITPD2012A000194|2012-06-18|

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