FR2538047A1 - Double-acting jack comprising an automatic device limiting the displacement of its shaft, and its application to lifting trucks - Google Patents

Double-acting jack comprising an automatic device limiting the displacement of its shaft, and its application to lifting trucks Download PDF

Info

Publication number
FR2538047A1
FR2538047A1 FR8221019A FR8221019A FR2538047A1 FR 2538047 A1 FR2538047 A1 FR 2538047A1 FR 8221019 A FR8221019 A FR 8221019A FR 8221019 A FR8221019 A FR 8221019A FR 2538047 A1 FR2538047 A1 FR 2538047A1
Authority
FR
France
Prior art keywords
rod
valve
jack
opening
passage
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.)
Granted
Application number
FR8221019A
Other languages
French (fr)
Other versions
FR2538047B1 (en
Inventor
Jacques Bouchet
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.)
Manitou BF SA
Original Assignee
Manitou BF SA
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 Manitou BF SA filed Critical Manitou BF SA
Priority to FR8221019A priority Critical patent/FR2538047B1/en
Publication of FR2538047A1 publication Critical patent/FR2538047A1/en
Application granted granted Critical
Publication of FR2538047B1 publication Critical patent/FR2538047B1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

Hydraulic double-acting jack comprising a fixed body in which a piston integral with the shaft can be displaced. The piston 12 comprises a passage 19 for connecting the two chambers 13, 14 of the jack, this passage 19 being closed in normal operation by two opposed ball valves 20, 21, the opening of one of the valves 21 being controlled by mechanical means carried by the shaft 8 of the jack, the second valve 20 opening under the pressure of the hydraulic fluid coming from the passage 19 after the opening of the first valve.

Description

L'invention concerne un dispositif de limita
tion automatique du déplacement de la tige d'un vérin à
double effet. Ce dispositif est plus particulierement
destine à être monté dans un tablier à double déplacement
latéral pour chariot élévateur.The invention relates to a limiting device
automatic displacement of the rod from a cylinder to
double effect. This device is more particularly
designed to be mounted in a double displacement deck
side for forklift.

Les chariots élévateurs effectuent des manuten
tions de plus en plus complexes, de sorte qu'ils sont pré;
vus pour recevoir de nombreux accessoires qui viennent en
remplacement ou en complément des fourches.Forklifts perform manuten
increasingly complex tions, so they are pre;
seen to receive many accessories that come in
replacement or addition to the forks.

Certains de ces accessoires comportent deux
outils mobiles latéralement ou verticalement, montés sur
le meme châssis, tels que les doubles tabliers à déplace
ment latéral, les doubles pinces, les translateurs, etc.Some of these accessories have two
tools movable laterally or vertically, mounted on
the same chassis, such as double shift aprons
lateral, double clamps, translators, etc.

Ces équipements présentent l'inconvénient que
la juxtaposition de deux outils mobiles sur le meme châs-
sis se traduit par des oppositions ou des chocs entre eux,
ce qui perturbe la manutention et provoque la détériora-
tion du matériel.This equipment has the disadvantage that
the juxtaposition of two mobile tools on the same frame-
sis results in oppositions or shocks between them,
which disrupts handling and causes deterioration
tion of the material.

Le but de l'invention est de remédier à cet
inconvénient et de procureur un dispositif qui limite auto
matiquement le déplacement de la tige du vérin à double
effet, qui pilote un premier tablier porteur d'un outil
monté sur le mat d'un chariot élévateur lorsque ledit
outil se trouve en course de collision avec un autre outil
porté par un second tablier monté sur le même mât.The object of the invention is to remedy this
inconvenience and prosecutor a device that limits self
matically moving the rod of the double cylinder
effect, which controls a first deck carrying a tool
mounted on the mast of a forklift when said
tool is in collision course with another tool
carried by a second deck mounted on the same mast.

Ce résultat est atteint en disposant dans le
piston du vérin un passage de communication entre les deux
chambres du vérin, fermé en fonctionnement normal par deux clapets à bille dont l'un est placé coaxialement à la tige du
vérin, l'ouverture dudit clapet étant commandée par une
tige secondaire coulissante, portée par la tige du vérin.This is achieved by having in the
piston of the cylinder a communication passage between the two
cylinder chambers, closed in normal operation by two ball valves, one of which is placed coaxially with the rod of the
cylinder, the opening of said valve being controlled by a
sliding secondary rod, carried by the cylinder rod.

Lorsque l'extrémité libre de la tige secondaire
faisant saillie à 1' extérieur de la tige principale, vient
en contact avec un obstacle, tel que par exemple le bord
d'un autre outil, son enfoncement provoque l'ouverture du
clapet à bille et le liquide hydraulique passe librement
d'une chambre à l'autre à travers le piston qui s'arrête. When the free end of the secondary rod
protruding outside the main rod, comes
in contact with an obstacle, such as for example the edge
another tool, its insertion causes the opening of the
ball valve and hydraulic fluid flows freely
from one chamber to another through the piston which stops.

L'invention concerne donc en premier lieu un vérin hydraulique à double effet constitué d'un corps fixe, dans lequel un piston solidaire d'une tige peut se déplacer, caractérisé en ce que le piston comporte un passage de mise en communication des deux chambres, fermé en fonctionnement normal par deux clapets à bille, l'ouver- ture d'un des clapets étant commandée par le déplacement d'un poussoir porté par la tige. The invention therefore relates firstly to a double-acting hydraulic cylinder consisting of a fixed body, in which a piston secured to a rod can move, characterized in that the piston has a passage for communicating the two chambers , closed in normal operation by two ball valves, the opening of one of the valves being controlled by the movement of a pusher carried by the rod.

L'invention concerne en second lieu, l'applica- tion d'un tel vérin comme dispositif anti-collision dans un double tablier à déplacement latéral pour chariot élé- vateur. Secondly, the invention relates to the application of such an actuator as an anti-collision device in a double apron with lateral displacement for a forklift.

L'invention sera mieux comprise à l'aide de la description ci-après, d'un exemple de réalisation en référence aux dessins annexés dans lesquels
La figure 1 est une vue schématique de face d'un mât télescopique de chariot élévateur portant un double tablier à déplacement latéral, muni du dispositif anticollision selon l'invention.The invention will be better understood with the aid of the description below, of an exemplary embodiment with reference to the appended drawings in which
Figure 1 is a schematic front view of a telescopic forklift mast carrying a double apron with lateral movement, provided with the anti-collision device according to the invention.

La figure 2 est une vue de profil selon la flèche A de la figure 1. FIG. 2 is a side view according to arrow A in FIG. 1.

La figure 3 est une vue de détail agrandie de la partie inscrite dans le cercle C de la figure 1. FIG. 3 is an enlarged detail view of the part inscribed in the circle C of FIG. 1.

La figure 4 est une vue en coupe agrandie d'un vérin commandant le déplacement d'un tablier. Figure 4 is an enlarged sectional view of a cylinder controlling the movement of an apron.

Le mat I est un mât télescopique classique monté de façon connue à l'avant d'un chariot élévateur. The mast I is a conventional telescopic mast mounted in a known manner at the front of a forklift.

Un châssis roulant 2 est disposé entre les montants du mât 1. Ce châssis est constitué par deux plaques latérales 3, portant des galets 4 et deux barres frontales 5 servant de support et de guide pour deux tabliers 6 sur lesquels viendront se fixer les outils, par exemple deux paires de fourches non représentées. Sur les barres frontales 5 du châssis 2, deux vérins à double effet 7 sont fixés par leurs corps 11. Les tiges 8 des vérins 7 sont fixées à des supports 9, 10, solidaires des tabliers 6. A rolling chassis 2 is disposed between the uprights of the mast 1. This chassis consists of two side plates 3, carrying rollers 4 and two front bars 5 serving as support and guide for two decks 6 on which the tools will be fixed, for example two pairs of forks not shown. On the front bars 5 of the chassis 2, two double-acting cylinders 7 are fixed by their bodies 11. The rods 8 of the cylinders 7 are fixed to supports 9, 10, integral with the aprons 6.

Le déplacement des tiges 8 entraînera le déplacement des tabliers 6 sur les barres 5.The displacement of the rods 8 will cause the aprons 6 to move on the bars 5.

Chaque tablier est indépendant, chaque vérin 7 étant commandé par un distributeur propre (non représenté) à partir de la cabine du chariot. Each deck is independent, each cylinder 7 being controlled by a clean distributor (not shown) from the carriage cabin.

Comme on le voit sur la figure 1, les deux vérins 7 sont fixés entre les barres 5, sensiblement dans le prolongement l'un de l'autre, mais avec un léger décalage dans le plan vertical qui les contient, de telle sorte que la tige de l'un soit située au-dessus de la tige de l'autre. As seen in Figure 1, the two cylinders 7 are fixed between the bars 5, substantially in the extension of one another, but with a slight offset in the vertical plane which contains them, so that the rod of one is located above the rod of the other.

Les courses de déplacement des tabliers 6 sont représentées sur la figure 1 par les segments Al + A2 pour le tablier de droite et par les segments B1 + B2 pour le tablier de gauche. La position neutre est représentée par les lignes A et B. L'écart D est inférieur aux courses respectives Al et B1. The displacement races of the aprons 6 are represented in FIG. 1 by the segments Al + A2 for the right apron and by the segments B1 + B2 for the left apron. The neutral position is represented by lines A and B. The difference D is less than the respective strokes Al and B1.

C'est dans la zone où leurs courses Al et B1 inter fèrent que se produisent les chocs néfastes, que l'invention permet d'éviter grâce à la constitution particulière du vérin 7 qui va maintenant être décrit plus en détail. It is in the zone where their strokes A1 and B1 interfere that the harmful shocks occur, which the invention makes it possible to avoid thanks to the particular constitution of the jack 7 which will now be described in more detail.

Sur la figure 4 est représentée une coupe partielle du vérin droit. Il va de soit que la construction du vérin gauche est symétrique. In Figure 4 is shown a partial section of the right cylinder. It goes without saying that the construction of the left cylinder is symmetrical.

Le vérin 7 est un vérin à double effet qui comporte un piston 12 définissant deux chambres 13 et 14. De part et d'autre du piston 12 sont fixées deux demi-tiges coaxiales opposées 8 et 81.  The jack 7 is a double-acting jack which comprises a piston 12 defining two chambers 13 and 14. On either side of the piston 12 are fixed two opposite coaxial half-rods 8 and 81.

Le corps 11 du vérin est fermé à ses extrémités par deux couvercles 15 et 16, chaque couvercle étant muni d'une ouverture centrale pour le passage des demi-tiges 8, 8'. The body 11 of the jack is closed at its ends by two covers 15 and 16, each cover being provided with a central opening for the passage of the half-rods 8, 8 '.

Le corps 11 comporte en outre deux ouvertures opposées 17, 18, qui permettent alternativement l'admission et le retour du liquide hydraulique dans le sens commandé par le distributeur (non représenté). The body 11 also comprises two opposite openings 17, 18, which alternately allow the admission and return of the hydraulic fluid in the direction controlled by the distributor (not shown).

Le piston 12 comporte un passage 19 qui permet de mettre en communication les deux chambres 13 et 14. En fonctionnement normal, le passage 19 est maintenu fermé par deux clapets à bille~20 et 21. Le clapet 21 est disposé dans le p-iston 13 entre les deux demi-tiges 8, 8' coaxialement à celles-ci.  The piston 12 has a passage 19 which allows the two chambers 13 and 14 to be placed in communication. In normal operation, the passage 19 is kept closed by two ball valves ~ 20 and 21. The valve 21 is placed in the p-piston 13 between the two half-rods 8, 8 'coaxially with these.

Un poussoir 22, contretenu par un ressort 23, est placé face au clapet 21. A pusher 22, supported by a spring 23, is placed opposite the valve 21.

La tige 8, située du côté du poussoir 22 est creuse et contient une tige secondaire 24 pouvant coulisser axialement par rapport à elle. The rod 8, located on the side of the pusher 22 is hollow and contains a secondary rod 24 which can slide axially relative to it.

La tige secondaire 24 comporte deux extrémités 25, 26, d'un diamètre plus petit que le reste de la tige 24. The secondary rod 24 has two ends 25, 26, of a smaller diameter than the rest of the rod 24.

L'extrémité libre 25 de la tige 24 fait saillie à l'extérieur de la demi-tige 8 à travers un couvercle 27 formant butée au déplacement de la tige 24 vers l'ex- térieur.  The free end 25 of the rod 24 projects outside the half-rod 8 through a cover 27 forming a stop for the displacement of the rod 24 towards the outside.

La demi-tige 8 comporte une première butée interne 28 pour le déplacement de la tige 24 en direction du poussoir 22 et une seconde butée interne 29 pour un ressort de rappel 30, disposé autour de l'extrémité 26 de la tige secondaire 24 dirigée vers le clapet 21. The half-rod 8 comprises a first internal stop 28 for moving the rod 24 in the direction of the pusher 22 and a second internal stop 29 for a return spring 30, disposed around the end 26 of the secondary rod 24 directed towards the valve 21.

On comprend que le déplacement de la tige secondaire 24 par rapport à la demi-tige 8 provoquera le déplacement du poussoir 22 et l'ouverture du clapet 21. Le liquide hydraulique vient alors ouvrir le clapet 20 et passe dans la chambre 13, ce qui stoppe le déplacement du piston 12, et des tiges 8, 8t qu'il porte. It is understood that the displacement of the secondary rod 24 relative to the half-rod 8 will cause the displacement of the pusher 22 and the opening of the valve 21. The hydraulic fluid then comes to open the valve 20 and passes into the chamber 13, which stops the movement of the piston 12, and of the rods 8, 8t which it carries.

Comme on le voit sur les figures 1 et 3, les supports 10 de l'extrémité de la demi-tige 8 qui porte la tige secondaire 24 sont disposés sur les tabliers 6, de manière à faire légèrement saillie à l'extérieur de ceuxci. Un trou 31, dans les supports 10, permet le passage de l'extrémité libre 25 de la tige secondaire 24, qui fait également saillie à l'extérieur du tablier 6 et du support 10. Lorsque les deux tabliers se déplacent selon une trajectoire convergente, l'enfoncement des extrémités 25 des tiges secondaires 24 ouvrira les clapets 21 et stoppera le déplacement des tabliers 6 avant que ceux-ci ne se heurtent.  As seen in Figures 1 and 3, the supports 10 of the end of the half-rod 8 which carries the secondary rod 24 are arranged on the aprons 6, so as to protrude slightly outside thereof. A hole 31 in the supports 10 allows the free end 25 of the secondary rod 24 to pass, which also projects outside the apron 6 and the support 10. When the two aprons move in a convergent path , the insertion of the ends 25 of the secondary rods 24 will open the valves 21 and will stop the movement of the aprons 6 before they collide.

Claims (5)

REVENDICATIONS 1. Vérin hydraulique à double effet, constitué d'un corps fixe dans lequel un piston solidaire d'une tige peut se déplacer, caractérisé en ce que le piston (12) comporte un passage (19) de mise en communication des deux chambres (13, 143 du vérin, ce passage (19) étant fermé en fonctionnement normal par deux clapets à bille (20, 21) opposés, l'ouverture d'un des clapets (21) étant commandée par des moyens mécaniques portés par la tige (8) du vérin, le second clapet (20) s'ouvrant sous la pression du liquide hydraulique en provenance du passage (19) après l'ouverture du premier clapet. 1. Double-acting hydraulic cylinder, consisting of a fixed body in which a piston secured to a rod can move, characterized in that the piston (12) has a passage (19) for communication between the two chambers ( 13, 143 of the jack, this passage (19) being closed in normal operation by two opposite ball valves (20, 21), the opening of one of the valves (21) being controlled by mechanical means carried by the rod ( 8) of the jack, the second valve (20) opening under the pressure of the hydraulic fluid coming from the passage (19) after the opening of the first valve. 2. Vérin hydraulique selon la revendication 1, caractérisé en ce que le clapet (21) dont l'ouverture est commandée par les moyens mécaniques, est disposé dans le piston (12) coaxialement à deux demi-tiges (8, 8') opposées, en ee que dans ledit piston (12) face audit clapet (21) est monté un poussoir (22) contretenu par un ressort (23) et en ce que la demi-tige (8) adjacente au poussoir est creuse et porte une tige secondaire (24) contretenue par un ressort (30) qui peut coulisser par rapport à ladite demi-tige (8) et dont l'extrémité libre fait saillie à l'extérieur de ladite tige. 2. Hydraulic cylinder according to claim 1, characterized in that the valve (21), the opening of which is controlled by mechanical means, is disposed in the piston (12) coaxially with two opposite half-rods (8, 8 ') , in that in said piston (12) facing said valve (21) is mounted a pusher (22) constrained by a spring (23) and in that the half-rod (8) adjacent to the pusher is hollow and carries a rod secondary (24) constrained by a spring (30) which can slide relative to said half-rod (8) and the free end of which projects outside of said rod. 3. Dispositif anti-collision entre deux accessoires montés sur le châssis d'un chariot élévateur, le déplacement desdits accessoires pouvant s'effectuer selon deux courses convergentes, chaque accessoire étant déplacé par un vérin à double effet commandé par un distributeur indépendant, les deux vérins étant montés symétriquement dans le même plan, caractérisé en ce que les vérins sont des vérins (7) selon la revendication 1 ou 2 et en ce que chaque accessoire ou son organe de support (6) comporte une butée (10) destinée à coopérer avec la tige (8) du vérin (7) pour commander l'ouverture du clapet (21), avant que lesdits accessoires n'entrent en collision. 3. Anti-collision device between two accessories mounted on the chassis of a forklift, the movement of said accessories can be carried out in two converging strokes, each accessory being moved by a double-acting cylinder controlled by an independent distributor, both cylinders being mounted symmetrically in the same plane, characterized in that the cylinders are cylinders (7) according to claim 1 or 2 and in that each accessory or its support member (6) comprises a stop (10) intended to cooperate with the rod (8) of the jack (7) to control the opening of the valve (21), before said accessories collide. 4. Dispositif anti-collision selon la revendication 3, caractérisé en ce que chaque vérin (7) est fixé par son corps (11) sur des barres frontales (5) montées sur le mât d'un chariot élévateur, en ce que les demitiges (8, 8') du vérin (7) sont fixées sur des supports (9, 10) solidaires d'un tablier (10) qui coopère avec l'extrémité libre (25) de la tige secondaire (24), portée par la demi-tige (8), est muni d'un trou (31) pour le passage de ladite extrémité libre (25). 4. Anti-collision device according to claim 3, characterized in that each cylinder (7) is fixed by its body (11) on front bars (5) mounted on the mast of a forklift, in that the half rods (8, 8 ') of the jack (7) are fixed on supports (9, 10) integral with an apron (10) which cooperates with the free end (25) of the secondary rod (24), carried by the half-rod (8), is provided with a hole (31) for the passage of said free end (25). 5. Dispositif anti-collision selon la revendication 4, caractérisé en ce que le support (10) fait légèrement saillie à l'extérieur du tablier (6) auquel il est fixé.  5. Anti-collision device according to claim 4, characterized in that the support (10) protrudes slightly outside the apron (6) to which it is fixed.
FR8221019A 1982-12-15 1982-12-15 DOUBLE-ACTING JACK COMPRISING A DEVICE FOR AUTOMATICALLY LIMITING THE MOVEMENT OF ITS ROD AND ITS APPLICATION TO LIFT TRUCKS Expired FR2538047B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8221019A FR2538047B1 (en) 1982-12-15 1982-12-15 DOUBLE-ACTING JACK COMPRISING A DEVICE FOR AUTOMATICALLY LIMITING THE MOVEMENT OF ITS ROD AND ITS APPLICATION TO LIFT TRUCKS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8221019A FR2538047B1 (en) 1982-12-15 1982-12-15 DOUBLE-ACTING JACK COMPRISING A DEVICE FOR AUTOMATICALLY LIMITING THE MOVEMENT OF ITS ROD AND ITS APPLICATION TO LIFT TRUCKS

Publications (2)

Publication Number Publication Date
FR2538047A1 true FR2538047A1 (en) 1984-06-22
FR2538047B1 FR2538047B1 (en) 1987-05-07

Family

ID=9280124

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8221019A Expired FR2538047B1 (en) 1982-12-15 1982-12-15 DOUBLE-ACTING JACK COMPRISING A DEVICE FOR AUTOMATICALLY LIMITING THE MOVEMENT OF ITS ROD AND ITS APPLICATION TO LIFT TRUCKS

Country Status (1)

Country Link
FR (1) FR2538047B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004013496A1 (en) * 2002-07-24 2004-02-12 Btm (Europe) Blechverbindungstechnik Gmbh Hydraulic cylinder
US7080589B2 (en) 2002-07-24 2006-07-25 Btm Corporation Hydraulic cylinder

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587182A (en) * 1950-06-19 1952-02-26 Bendix Aviat Corp Hydraulic motor cylinder with stroke limiting valve
US2614536A (en) * 1949-05-16 1952-10-21 Bendix Aviat Corp Adjustable stroke hydraulic motor
FR1125999A (en) * 1955-05-04 1956-11-12 Offray & Cie Device forming automatic pressure limiter and reducer by producing the end-of-stroke stop, for double-acting hydraulic cylinders
FR1365287A (en) * 1962-11-21 1964-07-03 Rivals Vertical hydraulic piston cylinder fitted with an auxiliary control piston
SU179894A1 (en) * 1965-01-22 1966-02-28 Донецкий государственный проектный , научно исследовательский PROMSTROY NI AND PROJECT »
US3760911A (en) * 1971-12-22 1973-09-25 Porter Co P L Hydraulic locking device
US4335992A (en) * 1980-01-07 1982-06-22 Towmotor Corporation Side shift fork adjustable carriage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614536A (en) * 1949-05-16 1952-10-21 Bendix Aviat Corp Adjustable stroke hydraulic motor
US2587182A (en) * 1950-06-19 1952-02-26 Bendix Aviat Corp Hydraulic motor cylinder with stroke limiting valve
FR1125999A (en) * 1955-05-04 1956-11-12 Offray & Cie Device forming automatic pressure limiter and reducer by producing the end-of-stroke stop, for double-acting hydraulic cylinders
FR1365287A (en) * 1962-11-21 1964-07-03 Rivals Vertical hydraulic piston cylinder fitted with an auxiliary control piston
SU179894A1 (en) * 1965-01-22 1966-02-28 Донецкий государственный проектный , научно исследовательский PROMSTROY NI AND PROJECT »
US3760911A (en) * 1971-12-22 1973-09-25 Porter Co P L Hydraulic locking device
US4335992A (en) * 1980-01-07 1982-06-22 Towmotor Corporation Side shift fork adjustable carriage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004013496A1 (en) * 2002-07-24 2004-02-12 Btm (Europe) Blechverbindungstechnik Gmbh Hydraulic cylinder
US7080589B2 (en) 2002-07-24 2006-07-25 Btm Corporation Hydraulic cylinder

Also Published As

Publication number Publication date
FR2538047B1 (en) 1987-05-07

Similar Documents

Publication Publication Date Title
EP0006076B1 (en) Lifting device with independently moving cage for climbing a mast
FR2769170A1 (en) SIDE TRAIL FOR THE LOWER CONNECTING ROD OF A TRACTOR
FR2538047A1 (en) Double-acting jack comprising an automatic device limiting the displacement of its shaft, and its application to lifting trucks
FR2559411A1 (en) WORKPIECE INSTALLATION, IN PARTICULAR FOR LOADING AND UNLOADING MACHINE TOOLS
EP0490798B1 (en) Crane, especially for handling
EP2678264B1 (en) Device for moving a load around by pushing and pulling and handling vehicle equipped with such a device
EP0688959B1 (en) Actuator
FR2747381A1 (en) DEVICE FOR TRANSFERING A LOAD BY PUSHING AND TRACTION IN THE SAME PLANE
EP0034999A1 (en) Means for mounting an auxiliary lifting device on the platform of an elevating truck, and truck for putting it into use
FR2783245A1 (en) Front loading pallet manipulation means, comprises width adjustable forks to manipulate pallets of varying widths or multiple pallet operation
FR2519621A1 (en) FORK DEVICE ON A LOAD TAKE-OFF SYSTEM FOR LIFTING MACHINES
EP1813542B1 (en) Container with hinged stacking T elements
EP0329584B1 (en) Frame-clamping device
FR2537120A1 (en) Container self-aligning device for a handling trolley.
EP0133105B1 (en) Electro-hydraulic height adjusting device for a motor vehicle
EP0133399B1 (en) Hydraulic security device for roll adjustment in rolling mills
FR2824741A1 (en) Gymnastic apparatus with counterweights and pneumatic cylinder with sliding piston and damping chamber
EP1849720B1 (en) Mobile vertical storage device
EP1176318A1 (en) Fluid actuator without friction
FR2891265A1 (en) ABSORBING BUMPER.
FR2670415A1 (en) Device for manoeuvring an industrial movable part
EP0733587B1 (en) Bottle transferring device
FR2836221A1 (en) Portable device for checking the pressure in a gas spring used in a frame or press, is configured so that it can be centered on the gas spring and used to measure the pressure without use of an overhead crane
FR2488233A1 (en) APPARATUS FOR LIFTING PAPER SHEETS SET INTO NOTEBOOKS, FOR MANUFACTURING BOOKS OR PERIODICALS
FR2519955A2 (en) Pressure operated tool support - has inflatable bellows with one end fixed and other carrying tool

Legal Events

Date Code Title Description
ST Notification of lapse