FR2515276A3 - Hydraulic ram with spring returned rod - has spring fitted externally to cylinder to aid force applied - Google Patents

Hydraulic ram with spring returned rod - has spring fitted externally to cylinder to aid force applied Download PDF

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Publication number
FR2515276A3
FR2515276A3 FR8120280A FR8120280A FR2515276A3 FR 2515276 A3 FR2515276 A3 FR 2515276A3 FR 8120280 A FR8120280 A FR 8120280A FR 8120280 A FR8120280 A FR 8120280A FR 2515276 A3 FR2515276 A3 FR 2515276A3
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FR
France
Prior art keywords
spring
cylinder
rod
hydraulic ram
force applied
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
FR8120280A
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French (fr)
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FR2515276B3 (en
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to FR8120280A priority Critical patent/FR2515276A3/en
Publication of FR2515276A3 publication Critical patent/FR2515276A3/en
Application granted granted Critical
Publication of FR2515276B3 publication Critical patent/FR2515276B3/fr
Granted legal-status Critical Current

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Classifications

    • 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
    • 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
    • F15B15/1476—Special return means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The hydraulic ram (1) has a rod which is returned by a spring (4). There are two fixings along or spaced from the ram axis. One of these fixings is connected to a cylinder boss which carries its fluid feed (2). The other fixing (5) engages on a shoulder formed on the rod, via a threaded washer (6), when the outside of the rod (7) is threaded. The tension of the return spring is adjustable. The external spring is more powerful than one fitted internally.

Description

Verin hydraulique à rappel mécanique par ressort
La presente invention concerne les vérins hydrauliques et pneumatiques, du type simple effet, dont le rappel est réalisé mécaniquement au moyen d'un ou plusieurs ressorts.Hydraulic cylinder with mechanical spring return
The present invention relates to hydraulic and pneumatic cylinders, of the single-acting type, the return of which is carried out mechanically by means of one or more springs.

Dans les dispositifs connus de ce genre, le ressort interieur au cylindre du vérin est d'un diamètre inférieur au diamètre du cylindre. L'effort du rappel est faible et le ressort lui-même détériore les parois du cylindre. On connait également des dispositifs mettant en oeuvre 1 ou 2 ressorts exterieurs au cylindre. Dans le premier cas, l'effort de rappel est déporté par rapport à l'axe du vérin et provoque des frottements supplémentaires au niveau de la tige ou du piston.In known devices of this kind, the spring inside the cylinder of the jack is of a diameter less than the diameter of the cylinder. The return force is low and the spring itself deteriorates the walls of the cylinder. There are also known devices using 1 or 2 springs outside the cylinder. In the first case, the return force is offset relative to the axis of the jack and causes additional friction at the level of the rod or of the piston.

Dans le deuxième cas, les ressorts sont placés de part et d'autre de l'axe du vérin, ce qui nécessite la mise en oeuvre de deux fixations plus longues et donnant à l'ensemble vérin-ressort un encombrement important.In the second case, the springs are placed on either side of the axis of the jack, which requires the use of two longer fasteners and giving the jack-spring assembly a significant bulk.


Le dispositif, selon l'invention, permet d'éviter ces inconvenients,
Dans celui-ci , en effet, l'effort de rappel est important, sans mettre en oeuvre des fixations volumineuses et coûteuses.
The device according to the invention makes it possible to avoid these drawbacks,
In this one, in fact, the restoring effort is significant, without using bulky and expensive fasteners.

Le dispositif de l'invention comporte un vérin simple effet dont l'alimentation se fait par un bossage extérieur au cylindre. Le ressort de rappel, dont le diamètre intérieur est inférieur au diamètre du cylindre, épouse le cylindre lui-même. Le ressort comporte d'un coté une fixation latérale correspondant à l'alimentation du vérin et sur laquelle elle s'appuie, de l'autre coté une spire d'un diamètre inférieur au diamètre primitif du ressort et qui s'appuie sur un épaulement réalisé sur la tige du vérin ou sur rondelle taraudée permettant de tendre le ressort, lorsque la tige est filetée.The device of the invention comprises a single-acting cylinder whose supply is made by a boss outside the cylinder. The return spring, the inner diameter of which is less than the diameter of the cylinder, follows the cylinder itself. The spring comprises on one side a lateral fixing corresponding to the supply of the jack and on which it rests, on the other side a turn of a diameter less than the original diameter of the spring and which rests on a shoulder made on the cylinder rod or on a threaded washer to tension the spring, when the rod is threaded.

Le dessin annexe illustre à titre d'exemple un mode de réalisation du dispositif . Tel qu'il est représenté, le dispositif comprend le vérin (1) dont l'alimentation (2) sert de butée à la fixation (3)du ressort (4). La deuxième fixation {5) du ressort (4) stappuie sur la rondelle taraudée (6) solidaire en translation de la tige (7). Lorsque le piston du vérin (1) est soumis à une pression la tige (7) tend le ressort par l'intermédiaire de la rondelle (6), lorsque la pression est supprimée le ressort (4) rappelle la tige(7) solidaire du piston. The accompanying drawing illustrates by way of example an embodiment of the device. As shown, the device comprises the jack (1), the power supply (2) of which serves as a stop for fixing (3) the spring (4). The second fixing (5) of the spring (4) rests on the threaded washer (6) integral in translation with the rod (7). When the piston of the jack (1) is subjected to a pressure the rod (7) tightens the spring via the washer (6), when the pressure is removed the spring (4) recalls the rod (7) integral with the piston.

Le dispositif, objet de l'invention peut être utilisé dans tous les cas ou le rappel d'un vérin doit être précis, régulier et important. Il peut être utilisé dans toute l'industrie et tout particulièrement pour l'ouverture et la fermeture de vanne, ainsi que dans le freinage des véhicules industriels. The device which is the subject of the invention can be used in all cases where the return of a jack must be precise, regular and important. It can be used throughout the industry and especially for opening and closing of valves, as well as in the braking of industrial vehicles.

Claims (4)

REVENDICATIONS 1 - Le dispositif permettant de rappeler la tige d'un vérin1 - The device allowing to recall the rod of a jack par l'intermédiaire d'un ressort caractérisé par le by means of a spring characterized by fait qu'il comporte deux fixations rapprochées ou con fact that it has two fasteners close together or con fondues avec l'axe du vérin. melted with the cylinder axis. 2 - Dispositif selon la revendication (1) caractérisé par le2 - Device according to claim (1) characterized by the fait que l'une des fixations du vérin epouse le bossage causes one of the cylinder attachments to fit the boss du cylindre par lequel s'effectue l'alimentation du vérin. of the cylinder through which the cylinder is supplied. 3 - Dispositif selon la revendication (1) caractérisé par le3 - Device according to claim (1) characterized by the fait que l'autre fixation s'appuie sur un épaulement réa causes the other attachment to rest on a sheave shoulder lisé sur la tige. read on the stem. 4 - Dispositif selon la revendication (3) caractérisé par le4 - Device according to claim (3) characterized by the fait que l'autre fixation s'appuie sur une rondelle tarau the other fixing is supported by a tarau washer dée lorsque la tige extérieure est filetée, 5 - Dispositif selon la revendication (4) caractérisé par le dée when the outer rod is threaded, 5 - Device according to claim (4) characterized by fait que la tension du ressort est règleble.  fact that the spring tension is adjustable.
FR8120280A 1981-10-27 1981-10-27 Hydraulic ram with spring returned rod - has spring fitted externally to cylinder to aid force applied Granted FR2515276A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8120280A FR2515276A3 (en) 1981-10-27 1981-10-27 Hydraulic ram with spring returned rod - has spring fitted externally to cylinder to aid force applied

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8120280A FR2515276A3 (en) 1981-10-27 1981-10-27 Hydraulic ram with spring returned rod - has spring fitted externally to cylinder to aid force applied

Publications (2)

Publication Number Publication Date
FR2515276A3 true FR2515276A3 (en) 1983-04-29
FR2515276B3 FR2515276B3 (en) 1983-09-16

Family

ID=9263512

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8120280A Granted FR2515276A3 (en) 1981-10-27 1981-10-27 Hydraulic ram with spring returned rod - has spring fitted externally to cylinder to aid force applied

Country Status (1)

Country Link
FR (1) FR2515276A3 (en)

Also Published As

Publication number Publication date
FR2515276B3 (en) 1983-09-16

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ST Notification of lapse
AR Application made for restoration
BR Restoration of rights