DE2502381A1 - DOUBLE-SIDED PNEUMATIC WORK CYLINDER WITH STEPLESS LOCKING - Google Patents

Description

Hanover, 10.1.1975 WP 1/75

Wabco Westinghouse GmbH, Hanover

Pneumatic working cylinder acting on both sides with stepless locking

The invention relates to a pneumatic working cylinder acting on both sides according to the preamble of the claim 1 .

Such working cylinders are used to actuate devices - such as opening and closing devices for Windows, ventilation, skylights and the like - steplessly operated. To establish facilities of this type in any To be able to hold a position, the piston of a working cylinder, which can be acted upon by compressed air on both sides, is equipped with a ..lock acting in both directions.

Such a pneumatic working cylinder is known from German patent application 2,157,569. The one here as an actuator designated working cylinder, the piston of which can be acted upon with compressed air on both sides and for its locking a lock acting in both directions is provided, which consists of two tilting, spring-loaded from the piston rod there is penetrated barrier plates and inside the cylinder in a through a partition from the working space of the

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Piston separated cylinder space is arranged in which by means of an auxiliary piston which is arranged on both sides of the locking plates and can be acted upon by compressed air on one side the lock is unlocked.

With all the advantages of this known embodiment one Adjustable and lockable working cylinder in any position This leaves a certain amount of effort to the extent that for the actuation of the release of the lock two additional auxiliary pistons are required, the chambers of which are connected to a control line via additional connections must be.

Furthermore, from the German patent specification 1 274 456 a Brake cylinder known, which has a one-sided lock. Here, too, there is an additional one for releasing the lock Piston necessary, the chamber of which must also be pressurized or vented via a control line.

The same applies to the locking device, which from the German patent specification 974 604 became known.

The invention was based on the object to find a way in a particularly simple construction, in which the purpose Loosening the lock dispenses with the expense of additional release pistons and / or additional control connections can be.

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The task is according to the invention by the in the characterizing Part of claim 1 listed features solved. Expedient refinements of the invention are set out in the subclaims refer to. . ·

The invention is described below using the principle drawing in the appendix, which shows one on both sides with compressed air beaui * 3heatable Arbeitsayl indians with the inventive in each position possible lock it represents, under construction and explained in more detail in the function.

The pneumatic working cylinder 1 has a piston rod 2 engaging via its free end on the relevant actuating device (not shown in the drawing), its double-acting piston 3, which is made up of parts 3a and 3a ', 3b and 3b' and between parts 3a / 3a · And 3b / 3b ¹ arranged conical rings 4 and 5 composed, within a cylinder 6 _? this dividing into 2 chambers 7 and 8 / can be acted upon with compressed air on both sides via the connections 9 and 10, respectively.

Between the two conical contact surfaces 11 and 12 of the Hinge 4 and 5 and the inner wall of the cylinder 6 are the Sperroljen 13 and 14 on the one hand against the piston surfaces 15 and 16, respectively, of the piston sub-piston 3a and 3b, respectively, and on the other wide by built-in between the conical rings 4 and 5 lyre plates 17 and 18 arranged to be freely movable to a limited extent.

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A spacer ring inserted between the spring plates 17 and 18 19, which can be a spring washer for the purpose of generating tension and simplifying assembly, enables a "certain deflection of these sheets 17 and 18 and thus a" limited axial movement of the rollers 13 and 14. On the other hand the spring plates 17 and 1d strive to make the touch contact the locking rollers 13 and 14 between the cylinder wall and the contact surfaces 11 and 12.

The arrangement of the sub-pistons 3a and 3b on the sub-pistons 3a ¹ and 3b ^! can be displaced in the area of a certain clearance 20 or 20 ', which ^{is limited by stops 21 and 22 on the partial piston 3a 1} or 3b' and by the rings 4 and 5 ..

If the piston 3 is to be moved to the right, for example by opening and closing a piston rod 2 To move the closing device, this is acted upon via the connection and the chamber 7 with compressed air. The partial piston 3a closes the clearance 20 and at the same time pushes the rollers 13 resting on its surface 15 to the right. Thus becomes prevents these rollers 13 from jamming between the conical contact surface during the rightward movement of the entire piston 3 11 and the inner wall of the cylinder 6 and thus an unwanted locking of the piston 3 occurs. After reaching the desired opening position, for example of the window of a greenhouse operated by the opening and closing device or of the covering members of a light dome, is the Compressed air supply blocked, d. H. the chamber 7 is vented.

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As a result of the weight of the window or the covering elements The resulting pressure is now due to the design in this example via the pull rod 2 on the piston 3 in transfer in the opposite direction, i.e. to the left, d. H. the pull rod 2 is pushed into cylinder 1. Here, the previously undesired during the clockwise movement of the piston 3 is now Jamming achieved by the rollers 14 between the Konischen.Anlauffläche 12 and the inner surface of the cylinder 6, which locks the piston in the desired position.

The locking of the piston 3 is automatically released when The chamber 8 is ventilated via the connection 10 and the piston 3 is acted upon by compressed air from this Geite. The plunger 3b pushes the rollers 14 resting on its surface 16 when the clearance 20 'is closed out of the jam and releases the piston 3 so that it can move to the left in any desired position. When venting the chamber 8 the piston is automatically locked 3-as before described - by jamming the rollers 14.

The locking of the piston 3 take over the rollers 13, if Due to the design, the weight of the actuators pulls the pull rod, d. H. if those is pulled out of the cylinder 1.

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Claims (5)

Claims ο r η ο ο ο ι. fr. 1. Pneumatic working cylinder for the stepless actuation of devices such as opening and closing devices for windows, ventilation, domed rooflights or the like with a piston rod engaging at its free inde on an actuating device, whose piston in the cylinder can be acted upon with compressed air on both sides and to lock it in both directions One lock each is provided, characterized in that the two locks each consist of a conical ring (4) or (5) and a plurality of locking rollers (13) freely movable between the conical contact surface (11) or (12) and the inner wall of the cylinder. or (14), the axial clearance (20) or (20 ¹ ) of the rollers (13) or (14) required for a locking position and a release position being provided on one side by the surface (15) or ( 16) of the partial piston (3a) or (3b) which can be displaced on the partial piston (3a ^{1 ) or (3b 1} ) is limited and on the other side the -limiting device which is elastic in a certain range ng is taken over by the spring plate (17) or (18). 2. Pneumatic working cylinder according to claim 1, characterized in that the two sliding surfaces of the sub-pistons (3a / 3a ·) and (3b / 3b ·), which are displaceable relative to one another within a certain tolerance range, are sealed ^{by means of a sealing ring (23) or (23 f)} . - 7 609831/0036 3. Pneumatic working cylinder according to claim 1 and 2, characterized in that the spacer ring (19) consists of one Spring ring "consists. 4. Pneumatic working cylinder according to claim 1 to 3, characterized in that all the individual parts of the piston (3) from one side onto the one that can be screwed to the piston rod (2) Shaft (24) can be mounted. 5. Pneumatic working cylinder according to claim 1, characterized in that that the shape of the locking rollers (13) and (14) to the inner diameter of the cylinder (6) and to the effective Diameter of the conical rings (4) and (5) are adapted. 609831/0036 Blank page