丹麦专利DK201670390A1 Bayonet coupling and machining unit with such bayonet coupling

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专利摘要:
Bayonet coupling for mounting a tool (1) on a drive shaft (2) of a machining unit. The drive shaft (2) is drivingly connected to the tool (1) via a bayonet coupling comprising two coupling parts. One coupling part is provided with a receiving groove (5) for an engagement pin (7) located on the other coupling part. Receiving grooves (5) have a first section (10) with an extension parallel to the axis of rotation and a second section (8) (9) with a transverse extension, preferably perpendicular to the axis of rotation, so that the tool (1) is driven via the engagement of the bayonet coupling. The bayonet coupling is special in that the second section (8) (9) of the receiving groove has an extension on each side of the first section such that a T-shaped receiving groove is formed and the bayonet coupling is provided with at least one locking tab (12) with barbs (13) for engagement with the corresponding tooth (11), so that, when rotating the tool, a locking engagement is established by engagement of the locking tabs (12) with the tooth (11). This results in a bayonet coupling that engages in locking action, regardless of the direction of rotation of the tool, and thus achieves higher security as the risk of the tool (1) falling off during use is minimized.
公开号:DK201670390A1
申请号:DKP201670390
申请日:2016-05-31
公开日:2017-05-22
发明作者:Poul Erik Jespersen
申请人:Kadicma Aps；
IPC主号:

专利说明:

Bayonet coupling and machining unit with such bayonet coupling The field of the invention
The present invention relates to a bayonet coupling for mounting a tool with tool elements on a drive shaft of a machining unit having a motor comprising a drive shaft for driving the tool about a rotary axis and the drive shaft being driven either directly or indirectly with the tool via a bayonet coupling comprising two coupling parts, one coupling part of which is provided with a receiving groove for an engagement pin on the second coupling member, said receiving groove having a first section having an extension parallel to the axis of rotation and a second section having a transverse extension, preferably perpendicular to the the axis of rotation so that the tool is driven via the engagement of the bayonet coupling.
BACKGROUND OF THE INVENTION
A machining unit is known in which different types of tool elements are mounted on different tools, and where said tools are easy to replace both in order to switch between different tools and to replace the tool in wear. An example of such a processing unit is described in WO2014 / 086367. For easy replacement, bayonet couplings are used between a drive plate and a base plate for the tool.
Furthermore, from US 4,661,009 A a bayonet coupling of the type mentioned initially is known, and which possesses all the features described in the preamble of claim 1. An L-shaped receiving groove is shown in this specification and it is not mentioned that the receiving groove can be have a T shape.
There is a desire to be able to handle tools where the rotation can be oriented clockwise or counterclockwise.
However, this will present a disadvantage for elements that are interconnected via a bayonet coupling, since the engagement pin only rotates in one direction with the other section of the receiving groove. Using a rotary processing unit in the opposite direction, the engagement pin will be in the first section of the receiving groove. There is a risk of the tool being detached from the drive shaft. Also, if the processing unit is used in one direction with rotation so that the engagement step engages with the second section of the receiving groove, there is also a disadvantage. When the motor is switched off, the tool of the machining unit can rotate to a position where the engagement pin is in the first section of the receiving slot due to the inertia. There is a risk of the tool being detached from the drive shaft.
The object of the invention
It is the object of the present invention to provide a tool in which these disadvantages are rectified.
It is a further object to provide a tool suitable for rotation in both directions without the risk of unintentionally triggering a bayonet connection between the engine and tool.
It is also an object that a machining unit can be easily used with different types of tool elements mounted on different tools and wherein said tools are easy to replace both to switch between different tools and to replace the tool by wear and tear.
Description of the Invention
This object is achieved according to the present invention with a bayonet coupling for mounting a tool with tool elements on a drive shaft of a machining unit having a motor comprising a drive shaft for driving the tool around a rotary axis and the drive shaft being driven either directly or indirectly with the tool via a bayonet coupling comprising two coupling parts, one coupling part of which is provided with a receiving groove for an engagement pin on the second coupling part, which receiving groove has a first section with an extension parallel to the axis of rotation and a second section with a transverse extension , preferably perpendicular to the axis of rotation, so that the tool is driven via the engagement of the bayonet coupling and which is characterized in that the second section of the receiving groove has an extension on each side of the first section so that a T-shaped receiving groove is formed. The bayonet coupling is provided with at least one locking tab with barbs for engagement with a corresponding tooth or a plurality of projections for establishing a locking engagement of the locking tabs with the toothing or projections upon rotation of the tool.
This results in the bayonet coupling being able to lock in both directions. The T-shaped groove ensures that the tool is attached to the drive shaft. Thereby, the bayonet coupling can engage independently of the direction of rotation of the drive shaft. Locking tabs and corresponding toothing or protuberance ensure that the tool is in locking engagement in the second section of the receiving groove. The locking engagement ensures that the tool and drive shaft, after being engaged in locking engagement, cannot rotate relative to each other. This prevents the engagement pin from getting back into the first part of the receiving groove, for example by a quick braking of the tool. This reduces the risk of the tool falling off during use.
This increases the safety of using a rotary tool machining unit. This is because, regardless of the direction of rotation, the tool cannot be detached from the drive shaft during use.
It is preferred that one or more teeth or projections are located on the hub part of a drive shaft and one or more corresponding locking tabs are placed in a bore in the tool for locking the bayonet mount parts against rotation.
This provides greater security when using the machining unit with a rotating tool. This is accomplished by the locking engagement between at least one tooth or the projections and one or more locking tabs holding the two parts of the bayonet coupling together. Thus, the tool cannot disengage from the drive shaft, for example when the machining unit is stopped and the rotation of the tool stops. Thus, the engagement pin cannot rotate back to the first section of the receiving groove, which prevents the tool from falling off the drive shaft.
The drive shaft of the processing unit is driven either directly or indirectly with the tool via the bayonet coupling.
In order to lock the tool on the drive shaft, the locking direction of the bayonet socket will be such that in the direction of rotation of the drive shaft at least one of the bayonet socket locking tabs will engage a corresponding tooth or protrusion. Attempts to rotate the bayonet mount parts in the opposite direction will be prevented by the locking engagement between at least one locking tab and the corresponding toothing.
The teeth or projections are preferably positioned so that at least one locking tab engages with a tooth or one of the projections regardless of the direction of rotation of the bayonet coupling locking direction.
This results in the same secure mounting of the tool on the drive shaft of the machining unit regardless of the direction of rotation of the tool.
The tooth or projections are preferably formed such that one face of the tooth or projections faces away from the locking tab (s) they are to engage when the engagement pin is in the first section of the receiving groove. All or part of the tooth or projections will engage the locking tabs after rotation of the first and / or second coupling members relative to each other when the engagement pin is in the second section of the receiving groove. The engagement between toothing or protrusion and locking tabs thus locks the bayonet socket coupling parts in a ratchet.
Each locking tab preferably comprises a line of weakness. This causes the locking tab to become damaged when the tool and hub portion of the machining unit drive shaft are separated.
By locking tab, a weakening line is obtained that the tool becomes easy to remove from the machining unit after use. This is done by at least one of the locking tabs breaking in or at the weakening line when the tool is removed, that is, by rotating the tool in the opposite direction on the drive shaft relative to the direction of rotation during the tool mounting. Thus, the at least one locking tab no longer engages the corresponding tooth or protrusion. Thus, the tool can again be rotated against the locking direction and separated from the machining unit.
The weakening line also results in the tool being unable to be mounted on the drive shaft. Thus, the tool is for single use, as there is destruction at the separation. This means that the tool cannot be recycled or, for example, tried separately to change grinding items. This increases the safety of the user of the tool and prevents the reuse of worn, defective or worn tools.
The at least one tooth or protrusion of the bayonet coupling is preferably located on a hub portion of the drive shaft. The locking tabs are preferably located in a bore in the tool where the bore is arranged to receive the hub portion. The at least one locking tab of the bayonet coupling thus locks against the corresponding tooth or protrusion on the hub portion when assembling the bayonet mount.
This ensures that the hub part of the drive shaft is not damaged when the tool and machining unit are separated. When separating tools and machining unit, it is preferably the locking tabs that are destroyed. Thus, it is the tool that is damaged and not the hub part.
The coupling portion with the receiving groove is preferably located on the hub portion with the receiving groove disposed on the outer circumference of the hub portion. The coupling part with the engagement pin is preferably arranged in a bore on the tool part, the bore being arranged to receive the hub part.
Alternatively, the coupling portion with the engagement pin is preferably a hub portion with the engagement pin located on the outer circumference of the hub portion. The coupling part with the receiving groove is preferably arranged in a bore on the tool part, the bore being arranged to receive the hub part.
Thus, the bayonet coupling can be constructed in two different ways. The hub portion may either have the coupling portion with the receiving groove, or the hub portion may have the coupling portion with the engagement pin, while the bore will have the opposite coupling portion with either the engagement pin or the receiving groove.
This provides flexibility in the structure of the bayonet coupling, so that the two different embodiments can be used to align the processing unit with the tool for a specific customer or task.
The design of the bayonet coupling with T-shaped receiving groove will in practice mean that both coupling parts have a T-shaped receiving groove and both coupling parts have at least one engagement pin. It is possible to design the two receiving grooves so that they appear identical in shape and size. Similarly, the coupling parts can be manufactured so that both coupling parts have an engagement pin that appears the same in shape and size. This makes it a choice which part is called receiving groove and which part is called interference loss. When the receiving groove of the coupling member is positioned on the hub portion, a tooth or projection is preferably placed in the second section of the receiving groove on each side of the first section. Thereby, the two coupling parts of the bayonet coupling are locked together, regardless of the direction of rotation they are clamped in. This ensures the same secure mounting, whether the machining unit rotates clockwise or counterclockwise.
The bayonet coupling is preferably arranged in that the engagement pin comprises two facing tabs facing each other. At least one of the locking tabs is intended to engage one of the receiving grooves or projections depending on the direction of rotation.
By the engagement pin of the bayonet coupling includes two facing tabs facing each other, symmetry is obtained such that there is a locking tab which engages the tooth or projections as the bayonet coupling is rotated in a clockwise direction and the second locking tab engages with the tooth or projections. , when the bayonet coupling is rotated counterclockwise. This results in the same locking effect, regardless of the direction the tool rotates.
Alternatively, the receiving groove is located in the bore of the tool and the engaging pin on the hub portion. The receiving groove is then preferably bounded by locking tabs on each side of the first section of the receiving groove, and the tooth or projections are arranged on the hub portion at the dorsal engaging surface of the engaging pin, i.e. the face of the engaging pin opposite the end face of the drive shaft.
The dorsal engaging surface of the engaging pin is the portion of the engaging pin facing away from the end of the hub portion and the drive shaft. The engaging surface is preferably flat, but may also be shaped differently, such as inclined or rounded.
As a result, when the bayonet clutch is assembled, at least one locking tab will engage a corresponding tooth or protrusion on the hub portion, whether the bayonet clutch is rotated clockwise or counterclockwise during the assembly of the bayonet socket, for example, during mounting of a tool on a drive shaft. This results in the same locking of the tool on the hub part of the drive shaft, no matter which direction the tool attaches to the hub part. In order to obtain a disposable tool, the coupling part with the locking tabs is located on the tool.
The one coupling part of the bayonet coupling is preferably provided with at least two receiving grooves. Similarly, the second coupling member is also preferably provided with at least two engagement pins so that the number of engagement pins is the same as the number of receiving grooves.
Hereby a bayonet coupling is obtained, where there are two locks between one part of the bayonet coupling and the other part of the bayonet coupling. Among other things, this helps to ensure a stable transfer of rotational force from the drive shaft to the tool. This also means that unwanted shaking does not occur because of only one attachment point. In addition, this helps ensure that the tool is locked to the drive shaft for at least two locking points. This also helps prevent a tool from unintentionally detaching from the drive shaft during a machining task and possibly being thrown out of the machining unit.
It is possible to have more than two receiving tracks, such as three, four, five or six. There may be the same number of intervention steps as the number of receiving tracks, or there may be fewer. For example, it is possible to have four receiving grooves, which are preferably rotationally symmetrically arranged on one part of the bayonet coupling, while the other part of the bayonet coupling has only two engagement pins which will cooperate with two of the four receiving grooves on the other part.
The bayonet coupling is preferably formed by having a collar or bottom at the bottom of the bore, the collar or bottom being oriented transversely, preferably perpendicular to the bore. This ensures that the coupling part of the hub part is mounted at the correct height in the coupling part of the bore, so that the assembly takes place easily. In addition, the collar or bottom ensures that the two coupling parts cannot be displaced axially relative to one another along the axis of rotation. The hub portion will interlock between the collar or bottom of the bore and an upper boundary in the bore, thus locking the two coupling parts together. This upper boundary is in one of the aforementioned variants the above mentioned engagement steps. In the second variant, the upper boundary is a wall around the second section of the receiving groove.
The second section of the receiving groove preferably has a size so that the engagement pin can slide therein without the risk of movement in the axial direction of the drive shaft.
This results in the tool not being able to move in an axial direction along the drive shaft, thereby changing the pressure exerted between the grinding, polishing or machining unit and the workpiece being processed with any subsequent changes in the grinding, polishing or polishing work. quality.
Preferably, the second section of the receiving groove is formed so that the upper side and / or lower side of the receiving groove slopes slightly against each other. Thereby, the second portion of the receiving groove becomes slightly wider, where it meets the first portion of the receiving groove relative to the inner end of the receiving groove. Hereby it is obtained that when the two parts of the bayonet coupling are rotated to engage, it is easier to ensure that the starting position of the two parts is opposite one another and then to ensure that increased friction is obtained in the bayonet socket by continued rotation to retain the two parts of the bayonet socket. in relation to each other.
Alternatively, the engagement pin is shaped with slightly wedge-shaped ends so that the end or ends of the engagement pin are narrower than the central portion of the engagement pin.
The bayonet coupling is preferably formed on the drive shaft in that the hub portion comprises a center shaft and a hub bushing interconnected, preferably by being cast or screwed together.
Alternatively, the center shaft may also comprise a collar provided with at least one guide hole cooperating with at least one guide pin on the hub bushing to establish a rotationally fixed connection.
The invention also relates to a machining unit with a bayonet mount, as described above, for mounting a tool on a drive shaft of a motor unit.
The tools of the machining unit preferably have means for grinding, polishing, polishing or similar tasks, which are referred to herein as tool elements.
For example, the machining unit may comprise a disk part which is attached to the drive shaft with the above-described bayonet mount so that the tool is attached to the disk part rather than directly to the drive shaft, thereby obtaining an indirect attachment of the tool to the machining unit as is already known.
In this way, the bayonet coupling can be used for various existing equipment which includes direct and indirect coupling to the processing unit.
The processing unit is, for example, equipped with the tool and the separate disc part being connected, the disc part being provided with first connecting means which releasably cooperate with corresponding second connecting means on the tool.
Preferably, the first and second connecting means are selected from carrier band connections and bayonet couplings. Preferably, the tool elements of the tool include means for grinding, polishing, polishing or similar tasks. Character description
The invention will be described in the following with reference to the drawings, in which
FIG. 1 shows a bayonet coupling for attaching a disposable tool to a drive shaft in a machining unit,
FIG. 2 shows a coupling portion of the bayonet coupling on a hub portion of a drive shaft;
FIG. 3a - 3d the hub part coupling part from different angles,
FIG. 4 shows toothing or protrusion on the hub portion,
FIG. 5 shows a tool with a spring-loaded drill bit, and
FIG. 6 shows details of the bore with springy tabs and a lower collar.
Detailed description of the invention
The invention is described with reference to a bayonet coupling with two couplings, wherein the coupling part with the receiving groove is located on the outside of a hub part which sits on a drive shaft while the coupling part with the engagement pin is located in a bore. Drilling is part of a tool. The bayonet coupling can be designed differently as described above.
FIG. 1 shows a tool 1 to be attached to a drive shaft 2. The drive shaft 2 is driven by a motor (not shown in the figures) for rotation about a rotary shaft 16. The tool has mounted tool elements 3, such as grinding elements or polishing elements. There is a hub part on the drive shaft. The hub portion is formed with two receiving grooves 5, with only one receiving groove visible in FIG. 1. The tool 1 has a bore 6 located centrally on the outer side of the tool 1. Down the bore are two engagement pins 7 (only one engagement pin is visible in Figure 1). As mentioned above, it is possible to have more or fewer receiving grooves and engagement steps.
The hub portion 4 has a T-shaped receiving groove 5, and when the hub portion 4 is inserted the bore 6, the tool 1 can be rotated both clockwise and counterclockwise, thus establishing a locking engagement in both clockwise and counterclockwise rotation. This ensures that the machining unit is securely attached to the drive shaft no matter which direction the tool rotates.
FIG. 2 shows a hub portion where the right and left sections respectively of the second section of two different receiving grooves 5.
FIG. 3a-3d show the receiving groove from different angles. On the shown hub portion 4, there are two receiving grooves, each having a first section and a second section, which second section is divided into a right portion 9 and a left portion 8.
FIG. 4 shows the hub portion 4 with the right portion of the second section of the receiving groove 9 and the left portion of the second section of the receiving groove 8. In both the right and left sections of the second section of the receiving groove, a toothing 11. The toothing away from the first section of the receiving groove is located. like a ratchet along with the bore locking tabs. The toothing ensures that the tool cannot rotate opposite the locking direction, for example if the rotation is stopped quickly and thus ensures that the tool does not fall off during use.
FIG. 5 shows the outermost part of the tool 1. The bore 6 is located centrally on the outermost part of the tool 1.1.
FIG. 6 shows the inner part of the bore. There are two engagement pins 7, each comprising two locking tabs 12, with the locking tabs facing each other. On the outermost part of the locking tabs, a barbell 13 is formed. The barbs of the locking tabs form the other part of the garbage together with the tooth 11 in the receiving groove 5 (Fig. 4). The locking tabs 12 further comprise a line of weakening 14. When the bayonet coupling is disassembled, the locking tabs 12 will be bent or broken, so that it is possible to rotate the two parts of the bayonet coupling opposite the rubbish. The use of weakening lines is preferably for single use of machining units. In the lower part of the bore 6 a collar 15 is placed perpendicular to the bore 6. The collar 15 means that the hub part 4 cannot pass through the tool 1, but that the hub part 4 is held at the height where receiving grooves 5 and engagement pins 7 have the right height so that they easily engage with each other. In addition, the hub portion will span between the engagement pins and the collar, thus ensuring that the tool does not move axially along the axis of rotation during use. 1. Tool 2. Drive shaft 3. Tool elements 4. Hub part 5. Receive groove. 6. Drilling 7. Stepping steps 8. Left section of second section of receiving groove 9. Right section of second section of receiving groove 10. First section of receiving groove 11. Tooth 12. Locking tabs 13. Barbs 14. Weak line 15. Collar 16. Rotary axis

权利要求:
Claims (10)
[1]
A bayonet coupling for mounting a tool (1) with tool elements (3) on a drive shaft (2) of a machining unit having a motor comprising a drive shaft (2) for driving the tool around a rotary axis (16), and wherein the drive shaft is operatively connected either directly or indirectly to the tool via a bayonet coupling comprising two coupling parts, one coupling part being provided with a receiving groove (5) for an engagement pin (7) on the other coupling part, which receiving groove (8.9, 10) has a first section (10) with an extension parallel to the axis of rotation and a second section (8,9) with a transverse extension, preferably perpendicular to the axis of rotation (16), so that the tool is driven via the engagement of the bayonet coupling, characterized in that the second section (8,9) of the receiving groove has an extension on each side of the first section so that a T-shaped receiving groove is formed and the bayonet coupling is provided with at least one locking tab (12) with barbs (1 3) for engagement with a corresponding tooth (11) or a plurality of projections for establishing a locking engagement of the locking tabs with the tooth (11) or the projections by rotation of the tool.
[2]
Bayonet coupling according to claim 1, characterized in that each locking tab comprises a weakening line (14), so that the locking tab (12) is damaged when the tool is removed from the hub (4) of the drive shaft.
[3]
Bayonet coupling according to any one of the preceding claims, characterized in that one or more teeth (11) or projections are located on a hub part (4) of the drive shaft and at least one locking tab (12) is placed in a bore in the host clothing. , and where the bore is arranged to receive the hub portion.
[4]
Bayonet coupling according to any one of the preceding claims, characterized in that the coupling part with the receiving groove (5) is the hub part (4), the receiving groove is arranged on an outer circumference of the hub part and the coupling part with the engaging pin (7) is arranged in the bore. on the tool.
[5]
Bayonet coupling according to claim 4, characterized in that the engagement pin (7) comprises two locking tabs (12) facing each other and the tooth (11) or the projections are arranged in the second section (8,9) of the receiving groove.
[6]
Bayonet coupling according to any one of claims 1-3, characterized in that the coupling part with the engagement pin (7) is a hub part (4), the engagement pin (7) being arranged on an outer circumference of the hub part and the coupling part with the receiving groove (8). , 9.10) is placed in the bore of the tool.
[7]
Bayonet coupling according to claim 6, characterized in that the delimitation of the receiving groove (8,9,10) comprises locking tabs (12) on each side of the first section (10) of the receiving groove and that the tooth (11) or the projections are arranged on the hub portion of the engagement pin. dorsal engaging surface.
[8]
Bayonet coupling according to any one of the preceding claims, characterized in that one coupling part is provided with at least two receiving grooves (8,9,10) and the other coupling part is provided with at least two engagement pins (7), so that the number of of receiving grooves is at least the same as the number of intervention steps.
[9]
Bayonet coupling according to any one of the preceding claims, characterized in that the second section (8,9) of the receiving track has a size so that the engagement pin (7) can slide therein without risk of movement in the direction of the axis of rotation.
[10]
A machining unit, preferably for grinding, polishing, polishing or similar tasks, wherein the machining unit comprises a bayonet coupling according to any one of claims 1-9 for mounting a tool (1) on a drive shaft (2) on a motor unit.

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引用文献:

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

DKPA201670390A|DK178917B1|2016-05-31|2016-05-31|Bayonet coupling and machining unit with such bayonet coupling|DKPA201670390A| DK178917B1|2016-05-31|2016-05-31|Bayonet coupling and machining unit with such bayonet coupling|

PCT/DK2017/050179| WO2017207007A1|2016-05-31|2017-05-31|Bayonet coupling and machining unit with such bayonet coupling|

EP17805914.3A| EP3463754A4|2016-05-31|2017-05-31|Bayonet coupling and machining unit with such bayonet coupling|

US16/305,601| US20200324384A1|2016-05-31|2017-05-31|Bayonet coupling and machining unit with such bayonet coupling|

CA3026310A| CA3026310A1|2016-05-31|2017-05-31|Bayonet coupling and machining unit with such bayonet coupling|

CN201780041133.5A| CN109789529B|2016-05-31|2017-05-31|Bayonet coupling and machining unit using same|

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