• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a telescopic actuator comprising a cylinder (1) having a closed end (2) and an open end (3) for the passage of a hollow rod (4) mounted to slide axially in the cylinder. The actuator comprises a central support (10) which extends from the closed end of the cylinder inside the rod and which carries obstacles (15) movable radially between a retracted position leaving free sliding of the rod and a protruding position in which the obstacles are engaged in a groove (9) of the rod to axially lock the rod relative to the cylinder, the sides of the obstacles and the groove being shaped to prevent removal of obstacles by displacement of the rod, the obstacles being arranged at the end of elastic strips (14) extending longitudinally and arranged to recall the obstacles from the retracted position to the projecting position, the central support carrying controlled means (20) for bending the blades to cause removal of obstacles to the retracted position.
    公开号:FR3081237A1
    申请号:FR1854162
    申请日:2018-05-18
    公开日:2019-11-22
    发明作者:Gilbert LECOURTIER；Arnaud Le Breton
    申请人:Safran Landing Systems SAS；
    IPC主号:
    专利说明:

    The invention relates to a telescopic actuator with automatic locking.
    BACKGROUND OF THE INVENTION
    The invention relates to a telescopic actuator equipped with a device for locking in position two movable elements relatively to each other in an axial direction, for example a rod mounted to slide telescopically in a cylinder. Some actuators are fitted with a locking device in the rod position, in particular in the retracted or extended position.
    The claw locking devices comprise on the one hand a sleeve, most often installed on the rod, and the tubular wall of which is cut to form a certain number of elastically deformable claws which extend in cantilever in an axial direction being terminated by hooks, and on the other hand an anchoring part formed on the cylinder, comprising an annular recess to receive the hooks. The anchoring part includes a step to bend the claws when the step passes under the hooks of the claws. The step is followed by an annular withdrawal in which the hooks engage to allow the claws to return to the rest position once the hooks have passed the step. A locking piston which has been pushed against a return spring by the hooks when they pass over the step moves then axially to cover the hooks of the claws and thus prevent them from bending, so that the hooks are held captive in the annular recess, which locks the actuator rod in position in the cylinder.
    To unlock the rod, it suffices to move the locking piston back so as to allow the claws to bend again, and to move the anchoring part away from the sleeve. The locking piston is moved against the return spring by means of pressurized fluid, in concert with the displacement of the rod, without it being necessary to provide an individualized command.
    The segment locking devices have segments mounted radially movable on the cylinder between a retracted position in which the rod is free to slide in the cylinder and an engaged position in which the segments are pushed by a piston, itself pushed by a spring, to enter a housing provided on the rod or on the associated piston. Once the segments are engaged, the piston passes over the segments to prevent them from retracting, and thus lock in position the rod on the cylinder.
    In both cases, the locking depends on the movement of a locking piston. The disengagement of the locking members (hooks of the claws, segments) when the locking piston is moved back is allowed by slopes made on the parts in contact making it possible to push back the locking members when the rod is moved in the cylinder.
    In a few cases, it has been possible to observe malfunctions preventing the locking piston from covering the blocking member, making it impossible to positively block the rod on the cylinder.
    OBJECT OF THE INVENTION
    The invention aims to provide a telescopic actuator equipped with an automatic locking device without locking piston.
    PRESENTATION OF THE INVENTION
    With a view to achieving this goal, a telescopic actuator is provided comprising a cylinder having a closed end and an open end for the passage of a hollow rod mounted to slide axially in the cylinder. According to the invention, the actuator comprises a central support which extends from the closed end of the cylinder inside the rod and which carries radially movable obstacles between a retracted position allowing free sliding of the rod and a projecting position in which the obstacles are engaged in a groove of the rod to axially lock the rod relative to the cylinder, the sides of the obstacles and of the groove being shaped to prevent any removal of the obstacles by displacement of the rod, the obstacles being arranged at the end of elastic blades extending axially and arranged to recall the obstacles from the retracted position to the projecting position, the central support carrying controlled means for bending the blades to cause the removal of the obstacles towards the retracted position.
    Thus, the locking is ensured automatically by the simple engagement of the obstacles in the groove of the rod under the action of the blades, the obstacles being held in position by the blades without it being necessary to confirm this engagement by a locking piston. . Any attempt to move the rod will then be blocked by the cooperation of obstacles with the sides of the throat. Unlocking requires the prior ordering of the means of bending the blades, which disengages the obstacles, allowing the free movement of the rod.
    According to a preferred embodiment, the controlled means for bending the blades comprise an unlocking piston mounted axially sliding in the central support between a rest position in which the unlocking piston is away from obstacles, and an unlocking position in which a hollow end taper of the unlocking piston cooperates with fingers secured to each of the obstacles to cause the blades to bend and therefore the obstacles to be removed from the retracted position.
    protruding at position
    DESCRIPTION OF THE FIGURES
    The invention will be better understood in the light of the following description of a particular embodiment of the invention, with reference to the figures of the appended drawings, among which:
    - Figure 1 is a sectional view of a hydraulic actuator provided with a locking device according to the invention, the rod being illustrated in the locking position;
    - Figure 2 is a partial sectional view of the sleeve carrying the obstacles of the locking device;
    - Figure 3 is a view similar to that of Figure 1 showing the activation of the unlocking piston;
    - Figure 4 is a view similar to that of Figure 1, showing the rod retracted below the locking position;
    - Figure 5 is a view similar to that of Figure 1, showing the rod extended beyond the locking position.
    DETAILED DESCRIPTION OF THE INVENTION
    With reference to FIG. 1, the telescopic actuator of the invention comprises a cylinder 1 closed at one end by a sealed bottom 2 and at another end by a drilled bottom 3 to let pass a rod 4 secured to a piston 5 mounted for sliding sliding in the cylinder 1 along an axis X to define a hydraulic retraction chamber 6 and a hydraulic extension chamber 7. The displacement of the rod 4 relative to the cylinder 1 is obtained by pressurizing one or the other bedrooms. Here, the rod 4 and the piston 5 are hollow and define an internal axial housing 8 having, at the level of the piston 5, a groove 9 with sides substantially perpendicular to the axis X. The actuator further comprises a central support 10 which extends from the sealed bottom 2 in an axial direction and onto which is screwed a locking sleeve 11, more particularly visible in FIG. 2, which extends inside the axial housing 8 of the rod / piston assembly .
    The locking sleeve 11 has a generally tubular shape terminated on one side by a bottom 12 and on the other side by a threaded end piece 13 intended to be screwed onto the central support 10. The locking sleeve 11 has a tubular wall in which of the longitudinal blades 14 are cut to each have a first end integral with the locking sleeve 11 and a free end carrying an obstacle 15 which projects outwardly from the locking sleeve 11 when the blades 14 are rest state, as shown here. A finger 16 extends longitudinally from each obstacle 15 inside the locking sleeve 11. The blades 14 can flex towards the inside of the locking sleeve 11 so that the obstacles 15 are brought radially towards a retracted position in which they do not protrude from the external surface of the locking sleeve 11. The blades 14 then exert an effort to return the obstacles 15 to the projecting position.
    Returning to FIG. 1, it can be seen that the obstacles 15 of the locking sleeve 11 are engaged in the groove 9 of the piston 5, so that the rod 4 is locked in position in the cylinder 1. The sides of the obstacles 15 and the sides of the groove 9 are shaped to prevent any retraction of the obstacles by displacement of the rod 4, so that the position illustrated in FIG. 2 is a stable position.
    To unlock the rod 4, an unlocking piston 20 is slidably mounted in the central support 10 to define an unlocking chamber 21 which is pressurized to cause the unlocking piston 20 to move to an unlocking position in which a tapered hollow end 22 of the piston cooperates with the fingers 16 to force the blades 14 to bend and thus retract the obstacles 15, so that the rod 4 is released and can slide freely, as illustrated in FIG. 3. When the chamber unlocking 21 is not pressurized, a return spring 23 moves the unlocking piston 20 to a rest position in which the unlocking piston 20 is distant from the fingers 16, as illustrated in FIG. 1.
    It will be noted that the rod 4 is locked automatically as soon as it reaches the locking position in which the groove 9 faces the obstacles 15. In the case illustrated in FIG. 4 in which the rod 4 has been retracted and is found below the locking position, the obstacles 15 remain retracted by being pressed against the internal surface of the axial housing extension chamber 7 is until the obstacle blades 15 towards the position of the rod 4. When the pressurized , the rod 4 comes out bent repel the projecting n in the groove 9, as soon as the latter passes opposite the obstacles 15. In the case illustrated in FIG. 5 in which the rod 4 has been taken out and is located at beyond the locking position, the obstacles 15 have returned to the projecting position under the action of the blades, since the rod 4 and the piston 5 are no longer facing the obstacles 15. When the retraction chamber 6 is pressurized , the ti ge 4 enters, and the piston 5 has on its rear face an erasing cone 25 forcing the obstacles 15 to retract by bending of the blades 14, until passing under the internal wall of the rod 4. The blades 14 bent push the obstacles 15 towards the projecting position in the groove 9 as soon as the latter passes opposite the obstacles 15.
    The invention is not limited to what has just been described, but on the contrary encompasses any variant coming within the framework defined by the inventions.
    In particular, although here the invention has been described in application to a hydraulic actuator, the invention may also be applied to an electromechanical or hybrid technology actuator.
    The actuation of the unlocking piston could for example be ensured by a simple electromagnet.
    Although here the locking position is an intermediate position between the retracted position and the relaxed position of the actuator, the locking device of the invention can be used to ensure locking in one of these two extreme positions.
    权利要求:
    Claims (4)
    [1" id="c-fr-0001]
    1. Telescopic actuator comprising a cylinder (1) having a closed end (2) and an open end (3) for the passage of a hollow rod (4) mounted to slide axially in the cylinder, characterized in that the actuator comprises a central support (10) which extends from the closed end of the cylinder inside the rod and which carries obstacles (15) movable radially between a retracted position allowing free sliding of the rod and a position in projection in which the obstacles are engaged in a groove (9) of the rod to lock the rod axially relative to the cylinder, the sides of the obstacles and of the groove being shaped to prevent any removal of the obstacles by displacement of the rod, the obstacles being arranged at the end of elastic blades (14) extending longitudinally and arranged to recall the obstacles from the retracted position to the projecting position, the central support carrying controlled means (20) for bending the blades to cause obstacles to be withdrawn towards the retracted position.
    [2" id="c-fr-0002]
    2. Telescopic actuator according to claim 1, in which the controlled means of bending the blades comprise an unlocking piston (20) mounted axially sliding on the central support (10) between a rest position in which the unlocking piston is away from obstacles, and an unlocking position in which a conical hollow end (22) of the unlocking piston cooperates with fingers (16) integral with each of the obstacles (15) to
    provoke the bending of the blades and so the withdrawal of obstacles of position in projection at the position retracted.
    [3" id="c-fr-0003]
    3. An actuator according to claim 1, in which the rod (4) is associated with a piston (5), the groove (9) for receiving obstacles being produced at the level of the piston.
    [4" id="c-fr-0004]
    4. Actuator according to claim 1, in which the rod (4) is associated with a piston (5) which comprises a 5 erasing cone (25) forcing the obstacles (15) to be retracted by bending of the blades (14 ) when the rod retracts.
    类似技术:
    公开号 | 公开日 | 专利标题
    CA3043098C|2021-06-22|Automatic locking telescopic actuator
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    EP0401097B1|1992-12-23|Gripping device of a connector
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    FR2671371A1|1992-07-10|Anti-panic device for instantly unlocking a lock mechanism
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    同族专利:
    公开号 | 公开日
    CN110500336A|2019-11-26|
    CN110500336B|2021-04-27|
    CA3043098C|2021-06-22|
    US20190353187A1|2019-11-21|
    EP3569873A1|2019-11-20|
    EP3569873B1|2021-09-22|
    US10801530B2|2020-10-13|
    CA3043098A1|2019-11-18|
    FR3081237B1|2020-12-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2702024A|1950-07-24|1955-02-15|Electro Hydraulics Ltd|Automatic mechanical locking device for telescopic jacks|
    GB1032243A|1964-03-09|1966-06-08|Dowty Rotol Ltd|Telescopic fluid-pressure-operable jacks|
    US3315568A|1965-05-28|1967-04-25|Otis Eng Co|Operator devices|
    US2297902A|1940-05-28|1942-10-06|Siam|Mechanical locking device for pistons and the like|
    US2851995A|1955-07-20|1958-09-16|Cleveland Pneumatic Ind Inc|Lock mechanism|
    US3072105A|1961-07-05|1963-01-08|Lionel Pacific Inc|Lock for fluid pressure actuator|
    GB1078618A|1965-08-03|1967-08-09|Hydraulic Unit Specialities Co|Locking means for hydraulic control valves|
    US3415167A|1966-10-20|1968-12-10|Whitney J. Champagne|Locking cylinder|
    FR2248449B1|1973-10-18|1976-10-01|Outillage Air Comprime|
    FR2402790B1|1977-09-08|1980-12-26|Messier Hispano Sa|
    US4188860A|1978-01-03|1980-02-19|Shafco Industries, Inc.|Locking mechanism|
    DE4120455A1|1991-06-21|1992-12-24|Timmer Pneumatik Gmbh|Sliding piston gear with positive end stop - has locking clamp on piston rod and end position flange with release piston located between cylinder and flange|
    DE10207415B4|2002-02-21|2014-01-16|Narr Beteiligungs Gmbh|Hydraulic or pneumatic drive for a tool clamp|
    DE102004030007A1|2004-06-22|2006-03-02|Zf Friedrichshafen Ag|Actuator device for actuating a locking mechanism|
    CN101576102A|2009-06-08|2009-11-11|南京晨光集团有限责任公司|Mechanical self-locking hydraulic cylinder|
    CN201982411U|2011-01-17|2011-09-21|江阴市洪腾机械有限公司|External control type self-locking hydraulic cylinder|
    GB201109487D0|2011-06-07|2011-07-20|Goodrich Actuation Systems Ltd|Actuator with locking arrangement|
    DE102012004157A1|2012-03-05|2013-09-05|Svm Schultz Verwaltungs-Gmbh & Co. Kg|locking unit|
    CN203641170U|2013-09-27|2014-06-11|北京航天发射技术研究所|Steel ball lock and interference external lock combined locking type hydraulic cylinder|
    CN103775431A|2014-03-03|2014-05-07|沈阳工业大学|Hydraulic cylinder capable of being locked at any position by using elastic sleeve|
    CN104006032B|2014-05-09|2016-01-20|中船重工中南装备有限责任公司|The locked oil hydraulic cylinder of a kind of two-way mechanical|
    CN104006033A|2014-05-09|2014-08-27|中船重工中南装备有限责任公司|Powerful and mechanical automatic-locking hydraulic cylinder|
    CN104454781B|2014-11-04|2017-05-24|长沙中联消防机械有限公司|Locking derricking oil cylinder, oil cylinder control system and climbing fire-fighting truck or fire-fighting operation vehicle|
    CN104405726B|2014-11-17|2018-03-13|徐州耐克盾机械制造有限公司|A kind of self-locking oil cylinder|
    CN104500501B|2014-12-05|2017-01-25|四川凌峰航空液压机械有限公司|Hydraulic floatingsnap ring lock|
    CN108999835A|2018-09-21|2018-12-14|中冶赛迪工程技术股份有限公司|A kind of conical surface type mechanical interlocking hydraulic cylinder|CN111306139B|2020-03-16|2021-08-20|娄底市中厚机械制造有限公司|Multistage hydraulic cylinder|
    CN112566436A|2020-12-14|2021-03-26|湖南维创尚科技有限公司|5G communication equipment convenient to maintain|
    法律状态:
    2019-04-18| PLFP| Fee payment|Year of fee payment: 2 |
    2019-11-22| PLSC| Search report ready|Effective date: 20191122 |
    2020-04-22| PLFP| Fee payment|Year of fee payment: 3 |
    2021-04-21| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1854162|2018-05-18|
    FR1854162A|FR3081237B1|2018-05-18|2018-05-18|TELESCOPIC ACTUATOR WITH AUTOMATIC LOCKING|FR1854162A| FR3081237B1|2018-05-18|2018-05-18|TELESCOPIC ACTUATOR WITH AUTOMATIC LOCKING|
    CA3043098A| CA3043098C|2018-05-18|2019-05-10|Automatic locking telescopic actuator|
    US16/410,063| US10801530B2|2018-05-18|2019-05-13|Telescopic actuator with automatic locking|
    EP19175001.7A| EP3569873B1|2018-05-18|2019-05-16|Telescopic actuator with automatic locking|
    CN201910408909.3A| CN110500336B|2018-05-18|2019-05-16|Telescopic actuator with automatic locking|
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