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WO1993012346A1 - Mecanisme de crampage de securite pour fortes charges pour poteaux de support extensibles telescopiques - Google Patents

Mecanisme de crampage de securite pour fortes charges pour poteaux de support extensibles telescopiques Download PDF

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Publication number
WO1993012346A1
WO1993012346A1 PCT/US1992/010749 US9210749W WO9312346A1 WO 1993012346 A1 WO1993012346 A1 WO 1993012346A1 US 9210749 W US9210749 W US 9210749W WO 9312346 A1 WO9312346 A1 WO 9312346A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner tube
locking plate
clutch mechanism
frictional
insert
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1992/010749
Other languages
English (en)
Inventor
Darrell A. Schoenig
Jonathan P. Workman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ultimate Support Systems Inc
Original Assignee
Ultimate Support Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ultimate Support Systems Inc filed Critical Ultimate Support Systems Inc
Publication of WO1993012346A1 publication Critical patent/WO1993012346A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/20—Undercarriages with or without wheels
    • F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
    • F16M11/26—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by telescoping, with or without folding
    • F16M11/28—Undercarriages for supports with one single telescoping pillar
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2/00—Friction-grip releasable fastenings
    • F16B2/20—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening
    • F16B2/22—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material
    • F16B2/24—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal
    • F16B2/241—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal
    • F16B2/245—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal external, i.e. with contracting action
    • F16B2/246—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal external, i.e. with contracting action the clip being released by tilting the clip or a part thereof to a position in which the axis of the openings surrounding the gripped elements is parallel to, or coincides with, the axis of the gripped elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M2200/00—Details of stands or supports
    • F16M2200/02—Locking means
    • F16M2200/025—Locking means for translational movement
    • F16M2200/027—Locking means for translational movement by friction

Definitions

  • This invention relates to safety clutch mechanisms for use with telescoping poles, and particularly to safety clutch mechanisms with controllable release.
  • the disclosed invention relates to high-load safety clutch mechanisms having a means for controlling the rate of compression of an inner telescoping pole within an outer pole.
  • performance stages are repeatedly being erected and broken down. This includes not only the stages, lighting and instrument stands, but also the sound equipment as well. While the bulk of this sound equipment can be positioned at or below the stage level, it is very important for sound quality that speakers be placed at various key points, and at various heights. Sometimes these heights are well above stage level.
  • the speakers used for concert events, or other stage performances may weigh as much as 150 pounds. These heavy loads make it no small task for the person or persons charged to raise or lower them to the desired position.
  • the hoisting process can be particularly dangerous as one considers that these poles typically have smooth outer surfaces and a firm grip is sometimes lost.
  • the cramp brake is designed such that under a load the downward motion of the inner telescoping tube causes the brake to lock the descent of the pole. This is an important safety feature when the load is to be raised.
  • the poles must also at some time be lowered in order to compact the equipment for storage or transport. This can be done in prior art devices by disengaging the cramp mechanism and lowering the speaker. Because of the way the cramp is designed to work the person lowering the speaker must either permanently disengage the cramp during lowering, as with the designs shown in Hammond et al. and U.S. Patent No. 1674081 to Adams, or with one hand holding the cramp in a disengaged position while lowering with the other hand, as shown in U.S. Patent No. 3480247 to Waner. Either process may work well with very light loads, as is the case with the Hammond, Adams and Waner inventions, but under heavy loads the process is much more difficult and the operator can be put at great risk.
  • the present invention has solved this problem to the degree that the operator may, with one hand, begin the slow descent of the heavy load and walk away returning to the speaker only after it has safely descended.
  • the present invention addresses and solves this problem by allowing the operator to lock the telescoping element in position.
  • the present invention in its various embodiments, recognizes and addresses these problems and overcomes the limitations perceived by those skilled in the art by presenting a design which, among other aspects, allows for slow continuous compression of a telescoping pole.
  • This element alone may allow a single operator to descend each telescoping pole in less time than a crew of three.
  • Those skilled in the art of telescoping support poles and clutch mechanism design have long been aware of the problems of operator safety without controlled descent. Yet no commercially acceptable solution has been available in spite of the fact that the necessary arts and elements for implementing the disclosed invention have existed for sometime.
  • the patents cited show that cramp mechanisms, as they are commonly called, have existed for over 100 years. Improvements have come in the way of greater locking and load ability, and widespread adaptation to uses in various fields.
  • DISCLOSURE OF INVENTION i ⁇ e present invention discloses a safety clutch mecnanism ⁇ o opera ⁇ e in conjunction with a telescoping pole, such as used in supporting sound system speakers at a live stage performance.
  • the device provides a reliable and effective means for safely lowering even a heavy load attached to the top of a telescoping pole.
  • the present invention utilizes techniques which were not previously considered to achieve leaps in performance compared to the prior art.
  • This invention serves to optimize safety for the operator by requiring less interaction and handling of the heavy loads during descent, to optimize the labor costs required by allowing less operators to lower even the heaviest of suitable loads, and to optimize equipment life by providing reversible features on highly stressed components.
  • the invention involves various embodiments of a safety clutch mechanism. Many of the elements of this device achieve several different objects which, when combined, act to achieve the mentioned leaps in performance.
  • the invention discloses an insert made of a polyamide for producing numerous degrees of frictional engagement with the inner telescoping pole to allow controlled load descent by a single person.
  • the device may also feature a damping mechanism which permits the telescoping pole to be hand carried horizontally without accidental extension, and also prevents the characteristic "chatter" which may occur as the cramp bounces during compression.
  • Still other features of the present device include an incremental adjustment mechanism which allows for the realization of the numerous degrees of frictional engagement of the frictional insert.
  • the invention breaks from several time-honored traditions in clutch mechanisms. While drawing from some of the important conditions demanded of these devices for providing an effective locking mechanism, the invention expands upon these conditions in an effort to provide a safe and reliable device during compression.
  • the present invention provides a high load safety clutch mechanism which allows slow continuous compression of a telescoping pole.
  • the stated safety clutch acts to frictionally engage the inner telescoping pole to restrict compression while allowing expansion to occur if so desired.
  • the safety clutch includes a replaceable snap-fit frictional insert which is capable of providing numerous degrees of frictional engagement with the inner telescoping pole.
  • the insert is reversible within an axially symmetric locking plate, in order to increase the amount of use possible from the insert.
  • the inner surface of the insert is radiused. To control the rate of compression of the telescoping pole the angle of inclination which directly relates to the amount of frictional engagement is incrementally adjusted until the desired rate is achieved.
  • One object of the present invention is to provide a design which provides increased operator safety in the compression mode. It is therefore an object for the present invention to allow the operator to set a desired compression rate of the telescoping poles. It is also an object to avoid disengaging the locking mechanism completely during compression. This provides single hand operation to activate the compression mode. It is also an object that the operator be permitted to activate the compression mode of the invention and leave the invention to compress automatically with no further interaction by the operator.
  • Another object of the present invention is that it be designed to permit horizontal or even inverted locking with no external applied load. It is an object that the device maintain a locked condition while compressed without inadvertently expanding during transport. It is also an object that the present invention should perform in a locking fashion during expansion mode. Similarly, it is an object that the present invention provide a design which is capable of locking the telescoping feature to permit removal of the load.
  • a further object of the present invention is that it be designed in a manner to allow maximum cost effectiveness, without compromising safety. Such cost effectiveness can be achieved through use of molded and snap-fit components. It is also an object that the present device be designed to permit quick and easy assembly. This will help to minimize cost of manufacture as well. It is still another object of the invention to minimize possible erroneous assembly. By designing components which cannot be put in backwards or upside down assembly is made much simpler.
  • Figure 1 is a cross section of one embodiment of the disclosed invention in a locked position.
  • Figure 2 is a top view of the locking plate and frictional insert.
  • Figure 3 is a cross section of the frictional insert showing the preferred radiused inner edge.
  • Figure 4 is an exploded view of a similar embodiment as that shown in figure
  • Figure 5 is a graph illustrating the rate of compression of the present invention compared with prior art devices.
  • Figure 1 shows a cross section of device (10) attached to outer tube (41 ) of telescoping pole (40), and engaging inner tube (42) to lock the extended position.
  • the basic elements of the preferred embodiment include locking plate (1 1 ), base (12), and frictional insert (13). It should be understood that while the following discussion refers to the telescoping pole in terms of ascent and descent, or raising and lowering both of which would indicate a vertical telescoping arrangement the terms extension and compression, or the like which would include both a vertical and horizontal telescoping arrangement should be considered synonymous.
  • the present invention is designed to work in either orientation.
  • base (12) is provided with lip (21 ) as a means for retaining device (10) on telescoping pole (40).
  • Base (12) may be slipped over inner tube (42) and slid toward outer tube (41 ) until lip (21 ) abuts with the end of outer tube (41 ).
  • a portion of base (12) surrounds the end of outer tube (41 ).
  • clamp (22) is provided as an integral element. With the use of a nut and bolt assembly, clamp (22) may be tightened to engage outer tube (41 ) to prevent slippage of device (10).
  • clamp (22) is shown to be an integral member of device (10) it is certainly intended that the means for retaining may encompass any other device, separate or integral to device (10), suitable for the purpose of retaining device (10) onto pole (40).
  • the need for the means for retaining is necessitated by the fact that device (10) need not be an integral component of telescoping pole (40), as with most of the prior art devices. This is an important element because it allows the replacement of either pole (40) or device (10) if they should become damaged. More importantly, the detachability of device (10) allows damaged components to be repaired or replaced with little effort or expense. This will be discussed in more detail.
  • thumbscrew (14) providing the adjustable means for varying frictional engagement and threaded through base (12).
  • the distal end of thumbscrew (14) is provided with cap nut (23), which when moved to the lowermost setting of thumbscrew (14) engages locking tab (43) forcing it against inner tube (42).
  • dual posts members (44) are provided on the side of thumbscrew (14) opposite inner tube (42).
  • Thumbscrew (14) is held in position by machine nut (15).
  • the use and exact function of thumbscrew (14) and locking tab (43) will be more apparent in the discussion of operation.
  • Pivot member (16) serves to maintain one end of locking plate (1 1 ) elevated at a functional height. This functional height is very important and easily determined to the operation of device (10). If the height is set too low a proper locking inclination would not be provided.
  • Locking plate (11) is superiorly situated to base (12) and surrounds inner tube (42), functioning as a means for maintaining tube (42) in an extended position.
  • one side or end of locking plate (11 ) is held aloft by pivot member (16) while the opposite side or end is yieldingly biased downward by spring (17), in this embodiment.
  • spring (17) in this embodiment is thumbscrew (14). This side of locking plate (11 ) is biased downward until cap nut (23) of thumbscrew (14) is engaged, or until a locking position is attained.
  • locking plate (11 ) in this embodiment is somewhat oblong. This is not a necessitated shape, and certainly other shapes, such as circular, may be utilized with equal suitability.
  • insert (13) acts to create a slow, continuous movement or compression of inner tube (42) within outer tube (41 ).
  • radius (25) Through trial-and-error it is believed that a radius no more than .125 inches works best for this feature. This size requirement is not one of mere choice, but rather serves an important functional purpose. That is, larger radii tend to wedge onto inner tube (42) and release suddenly, creating the same effect as the prior art devices as illustrated in figure 5.
  • insert (13), in this embodiment, is snap-fitted within plate (1 1 ) to allow easy assembly, or even rotation as one inner edge may become worn.
  • Insert (13) could be designed, however, as part of locking plate (1 1 ), such that they are one-piece. Ultimately, when both inner edges of insert (13) are worn beyond sufficient functional requirements, insert (13) may be replaced.
  • the design of insert (13), is such that it will wear on the top surface of high end (A), and the bottom surface of low end (B) during use. By reversing the orientation of locking plate (1 1 ) low end (B) becomes high end (A), and vice versa.
  • the symmetry of insert (13), as shown in figure 2 simplifies assembly of device (10). That is, the assembler does not have to spend time figuring out the front and back of each piece as it practically cannot be improperly oriented within locking plate (1 1 ).
  • An advantage to the use of insert (13) with locking plate (1 1 ) is related to the materials of which they are made.
  • Prior art devices have not apparently given much thought to the use of polyamide materials for cramp mechanisms. This may be because of its inferior strength when compared to most metals, even though it may provide ideal frictional engagement. Additionally, polyamide materials have favorable wear characteristics.
  • the present invention has combined the advantages of each material to provide a strong locking mechanism with variable, and controllable, degrees of frictional engagement, and excellent wear characteristics. .
  • housing (18) is concealed by housing (18), as shown in figure 4.
  • Housing (18) is slipped over inner tube (42) and brought down to cover locking plate (11 ), and the other internal components.
  • Housing (18) also serves as the support surface which allows spring (17) to bias locking plate (1 1 ).
  • the interior height of housing (18) should be limited so as not to require too large a spring.
  • the present embodiment is designed such that housing (18) snap-fits onto base (12), as shown in figure 1. Several designs for this snap-fit are possible, as is well known by those skilled in the art.
  • Housing (18) may also be designed such that it is attached by other conventional means, such as, but not limited to nuts and bolts, machine screws, adhesives, clamps, or the like. The scope of the present invention is intended to cover such minor modifications. It has been anticipated that the exterior of housing (18) may provide adequate surface area for attachment of trademarks, operating instructions, and/or safety labels as well.
  • device (10) as it functions in operation.
  • the process for raising a high load secured to the free end of inner tube (42) can be understood.
  • high load it is meant that the present embodiment is designed to elevate objects greater in weight than that which the operator could normally lift with a single hand.
  • the embodiment, and particularly radius (25) could naturally be scaled down to function adequately for "light load” objects as well.
  • the safest way to extend inner pole (42) is to first insure locking plate (1 1 ) is sufficiently inclined to cause frictional engagement of insert (13) with inner tube (42). This may be accomplished by lowering thumbscrew (14) so that it is completely disengaged from plate (11 ). Then inner tube (42) may be raised in any conventional manner. Upon release of inner tube (42) the applied load will cause insert (13), which at this point is fully engaged with inner tube (42), to force locking plate (1 1 ) into a locked position.
  • Insert (13), of this embodiment is made of MoS 2 filled polyamide material. This material is believed to provide increased friction and wear resistance over a standard polyamide, such as nylon 6/6. It may also supply a smoother and more controllable performance by decreasing the differential between the static and dynamic coefficients of friction. Naturally, it is within the scope of this discussion to use other materials known to those skilled in the art which may have relatively close static and dynamic coefficients of friction. The closeness of these parameters is dependent on the materials ability to be adjusted to numerous degrees of frictional engagement between a completely locked position and a disengaged position.
  • thumbscrew (14) is such means, but obviously this means could be provided by a conventional screw, or some other adjustable member.
  • the threaded shaft of thumbscrew (14) gives it an infinitely adjustable range.
  • FIG 5 illustrates the present invention provides a great deal more control than that of any of the prior art devices.
  • Figure 5 illustrates the dramatic differences of performance between prior art devices and the present invention.
  • the solid line represents how minor interactions by the operator, as he turns thumbscrew (14) to engage locking plate (1 1 ), can begin a slow, and continuous compression rate of inner pole (42). Further interaction, through continued turning of thumbscrew (14) causes an increased compression rate, until finally locking plate (11 ) is fully disengaged or "free".
  • thumbscrew 14
  • interaction by the operator to bring the locking mechanism in a horizontal position typically begins and ends with a fast, uncontrolled descent of the load. This operation is illustrated by the broken line of figure 5.
  • the operator may wish to begin the load descent and then walk a safe distance from device (10). This may also be helpful in the case where there are a number of poles to descend, for instance at a live public concert with many speakers positioned around a stadium or hall. A single operator could begin the descent of each speaker without having to wait for its completion, saving on valuable man-hours and cost.
  • Another practice might be to set the compression rate to a slow descent, and then manually pull the load downward. Upon release after each pull the descent returns to its set compression rate. This allows the load to be brought down quicker, by a single person, safely and under complete control.
  • Spring (17) serves an important function in the descent mode. With many prior art devices, slippage of the cramp mechanism can occur. When this happens, of course, there is a rapid, often catastrophic descent of the inner tube. In addition, rather than the cramp locking again as it is designed to do, there can be a bounce between an engaged and disengaged position causing the inner tube to bounce downward in a choppy and erratic fashion. In the present invention, spring (17) prevents the bounce or chatter effect. If there is a frictional disengagement between insert (13) and inner tube (42) the descent is still smooth, continuous and typically very slow.
  • telescoping pole (40) after telescoping pole (40) has been relieved of its load a process which is more completely explained later and is to be carried to a truck or area of storage, it may be held in a downwardly slanted or completely inverted position without fear that inner tube (42) will fall out. This is possible because spring (17) maintains locking plate (1 1 ) in a locked position, even upside down. Of course, it is important that after complete descent thumbscrew (14) be disengaged from locking plate (1 1 ).
  • the present invention may act as a two-way clutch which permits the locking of inner tube (42) from either descending as explained above or ascending through use of locking tab
  • thumbscrew (14) By turning thumbscrew (14) to its lowest position, locking tab (42) is forced into frictional engagement with inner tube (42). The amount of frictional engagement is sufficient to prevent the ascent of inner tube (42) during removal of the load. As locking tab (43) presses against inner tube (42) it may be forced backwards against thumbscrew (14). In some cases this is sufficient to maintain the necessary frictional engagement of inner tube (14). In other instances thumbscrew (14) will become bound up, and the necessary frictional engagement may be lost. To counter this problem stationary dual post members (44) are molded adjacent thumbscrew (14) opposite inner tube (42). Post members (44) prevent lateral movement of locking tab (43) in the direction of thumbscrew (14) such that frictional engagement is maintained upon inner tube (42). Naturally, there is a limitless number of variations possible regarding locking tab (43) and dual post members (44). To the extent that any such modifications utilize the basic concept of frictionally engaging inner tube (42) they should be considered to fall within the breadth and scope of the present invention.
  • locking plate (1 1 ) is designed to be axially symmetric about line a-a. As such, each side then is a mirror image of the other. This allows locking plate (1 1 ) to be removed and turned 180° and reinserted when one side of insert (13) becomes too worn.
  • the seat (26) for spring (17) can be seen on both ends of locking plate (11 ), as the position of spring (17) must also be changed to the opposite end when locking plate (11 ) is turned.
  • This reversible feature allows the usable life of the insert to be essentially doubled.
  • Alternative designs might allow for a round locking plate to permit even greater increases of usable life. In such a design the locking plate might only be rotated 10° each time, thereby utilizing the full circumference of the inner edge of the insert.
  • device (10) is that it is designed as separate components, which can be removed individually or as an entire unit. This feature allows for the realization of maximum cost effectiveness in manufacturing, and ease of assembly.
  • the materials used for many of the components, such as base (11 ), and housing (18), in the preferred embodiment are of an impact resistant, dimensionally stable plastic. This material provides an adequate safety factor, as well as being cost effective. In spite of this, it is certainly possible for some of these components to become damaged during normal use or storage. In such an instance the damaged component may be easily replaced without discarding the entire device. This is also the case with the metal components as well. Naturally, should either device (10), or telescoping pole (40) be completely destroyed, each may be replaced without much trouble, or waste of good materials.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Toys (AREA)

Abstract

Mécanisme de crampage de sécurité (10) destiné à des supports tripodes à éléments extensibles télescopiques, chacun de ces éléments pouvant être déployé d'une certaine longueur et maintenu dans cette position contre une force contraire. Le mécanisme de crampage visé par cette invention permet en outre de rétracter de manière continue, régulière et contrôlée les éléments télescopiques, apportant ainsi un supplément de sécurité pour l'opérateur. Du fait qu'il peut être mis en ÷uvre d'une seule main, ce mécanisme de crampage allège la tâche de la personne qui doit effectuer seule la rétraction d'un dispositif multiple. Le mécanisme de crampage permet également de régler automatiquement la vitesse de rétraction souhaitée. On parvient à ce résultat en réduisant progressivement la force de frottement du mécanisme de manière à l'amener légèrement en deçà de celle induite par la force de gravité s'exerçant sur la charge opposée. Un accroissement de l'écart entre ces deux forces, en faveur de la force de gravité, aura tendance à accroître la vitesse de rétraction. L'enlèvement d'une charge sans extension inopinée s'effectue grâce à une fiche de verrouillage engagée à force dans le mécanisme d'extension afin d'interdire une telle extension au moment où une force dirigée vers le haut est appliquée à la charge. La configuration en composants multiples du mécanisme de crampage permet d'entretenir l'ensemble du dispositif en changeant au besoin, dans un souci de sécurité, seulement les éléments endommagés et non la totalité du dispositif.
PCT/US1992/010749 1991-12-13 1992-12-11 Mecanisme de crampage de securite pour fortes charges pour poteaux de support extensibles telescopiques Ceased WO1993012346A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80715391A 1991-12-13 1991-12-13
US07/807,153 1991-12-13

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WO1993012346A1 true WO1993012346A1 (fr) 1993-06-24

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TW (1) TW205087B (fr)
WO (1) WO1993012346A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5832671A (en) * 1995-02-22 1998-11-10 Vacant Property Security Limited Security closure
WO2002009632A3 (fr) * 2000-08-01 2002-04-04 Hill Rom Services Inc Ensemble support de dispositif medical
FR2821875A1 (fr) * 2001-03-08 2002-09-13 Smc Kk Mecanisme pour maintenir deverrouille un dispositif de verrou
FR2833052A1 (fr) * 2001-11-30 2003-06-06 Cera Systeme de deplacement et de blocage en translation d'une tige lisse, par arc-boutement d'une piece de blocage
US6704956B2 (en) 2001-08-23 2004-03-16 Hill-Rom Services, Inc. Hospital bed equipment support apparatus
NL1022805C2 (nl) * 2003-02-28 2004-09-21 R & S Techmedic B V Kleminrichting.
EP1662152A3 (fr) * 2004-11-30 2008-01-23 Bosch Rexroth Teknik AB Dispositif de verrouillage pour un vérin
CN108813925A (zh) * 2018-07-18 2018-11-16 佛山市合和兴科技实业有限公司 一种叶片式无级升降器
CN113715893A (zh) * 2020-12-28 2021-11-30 太仓市赛恩特精密机械有限公司 一种儿童车用的长度可调的伸缩管套结构
US11441589B1 (en) 2021-06-30 2022-09-13 Brent Ravnaas Locking device for a telescoping leg

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021423A1 (fr) * 1979-06-29 1981-01-07 Michel A. Pierrat Organe de blocage pour une fendeuse de bûches
FR2522743A1 (fr) * 1982-03-02 1983-09-09 Thomson Brandt Dispositif de verrouillage
WO1985003746A1 (fr) * 1984-02-23 1985-08-29 Keld Lundqvist Collier de serrage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021423A1 (fr) * 1979-06-29 1981-01-07 Michel A. Pierrat Organe de blocage pour une fendeuse de bûches
FR2522743A1 (fr) * 1982-03-02 1983-09-09 Thomson Brandt Dispositif de verrouillage
WO1985003746A1 (fr) * 1984-02-23 1985-08-29 Keld Lundqvist Collier de serrage

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5832671A (en) * 1995-02-22 1998-11-10 Vacant Property Security Limited Security closure
WO2002009632A3 (fr) * 2000-08-01 2002-04-04 Hill Rom Services Inc Ensemble support de dispositif medical
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CN108813925A (zh) * 2018-07-18 2018-11-16 佛山市合和兴科技实业有限公司 一种叶片式无级升降器
CN108813925B (zh) * 2018-07-18 2024-03-12 佛山市合和兴科技实业有限公司 一种叶片式无级升降器
CN113715893A (zh) * 2020-12-28 2021-11-30 太仓市赛恩特精密机械有限公司 一种儿童车用的长度可调的伸缩管套结构
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TW205087B (fr) 1993-05-01
AU3277493A (en) 1993-07-19

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