DE1426553A1 - Self-locking working piston activated by the pressure of a fluid medium - Google Patents

Description

Dipl.-Ing. Egon Prince

Dr. Gertrud Haussr Munich-Pasing, April 3rd

Un ^^ HU

Monkf. -. »N -. 'G

Ernsbcrgersfraße 19

PosJscheckWo. Monks 117078

Plessey-ÜK Limited, 56 Vicarage Lane

Ilford, Essex, England

Our sign; P 1683

Self-locking by printing a fluid medium "actuated work basket

The invention "relates to by the pressure of fluids Media "actuated working piston and aims to create a working piston arrangement to provide which has improved means of automatic locking or locking of the piston at either end of its stroke regardless of its presence to secure any pressure and around automatically the piston when a pressure is applied to the piston to unlock to move it to the opposite end of its stroke.

According to the invention, the working piston device has a Main piston, which is attached to a piston rod in such a way that it is in a cylinder between two end stops can move two sets of leather claws, which are effective at both ends of the piston stroke to "the piston

against

fei. ·

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to lock against movement to the other end, an auxiliary piston which is movable in the longitudinal direction of the cylinder by a limited distance relative to the main basket is and, v / enn this from one of its end positions relative is moved to the piston in the other, is effective to block the locking claw set at the end of a to move such a movement out of their engaged position, it being possible for the other locking claw set will lock the piston at the opposite end of its travel stroke. The auxiliary piston preferably has a sleeve that slides in the cylinder and seals surrounds the main piston in such a way that it forms an annular pressure surface at each end of the cylinder. The claws are preferably resiliently attached to each end of the cylinder. and designed and arranged in such a way that this is in a recessed Shoulder. Engage in a coaxial bore at the adjacent end of the piston. Preferably, "each claw ■ an outwardly extending thumb that resiliently or resiliently into the inner surface of the sleeve-shaped Engages auxiliary piston, which is provided with circumferential grooves, which oppose the thumbs of the resilient claws of each set when the piston is at the adjacent end of its stroke and when the auxiliary piston is at the end of its stroke relative to the main piston in the direction of the previous piston movement is »

if

80 980 9/02 7 6

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When. © in pressure is applied to the main valve to the other At the end of its stroke, the piston will begin to move a movement under the action of this pressure due to the engagement of the claws of a set in its recesses prevented and the auxiliary piston, however, can move and moves relative to the main piston. This will make the recessed sound out of its position in which the thumb is opposite the claws, so that the squatting effect the inner surface of the auxiliary piston on which the thumb pushes the claws out of engagement. This will the main piston is released so that it can perform its stroke of movement. Just before the piston stroke through the corresponding end stop is terminated, the claws pressed inwards at the opposite end of the cylinder by the inwardly leading chamfer at the end of the piston and can then snap into engagement with the recessed shoulders at the end of the piston stroke because their thumbs then face the recessed groove at the opposite end of the auxiliary piston.

An embodiment of the invention is shown in the figures of the drawing. Show it:

Fig. 1 is a partial axial view showing one end of the Working cylinder shows, with the piston sm the end of the The cylinder is locked in its position

' and

·· .. tfis · 2

■ * · BAD ORIGINAL

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Fig. 2 is a perspective view showing a spring claw set shows, which forms an "Ofanzes" with a mounting flange.

Reference is made to FIG. 1. A split piston 1 is by means of a spacer sleeve 3 and a sleeve nut 4 attached to a piston rod 2, the piston rod sliding in a sealed manner within the cylinder 5 and this sealing takes place by means of a carbon seal 6, The piston has a significantly smaller outer endurance than the inner diameter of the cylinder 5 so that an annular gap is left free. This gap takes one sleeve-shaped auxiliary piston 7. This auxiliary piston 7 has an inner flange 8, which is in a circumferential recess 9 of the piston 1 engages. This will make the route of the ' limited relative longitudinal movement. Carbon seals 10 and 11 are provided to provide a liquid tight seal between the sleeve 7 and the piston 1 on the one hand and the To create cylinder 5 on the other hand. The piston instructs at each end a coaxial bore 12 which defines a recessed shoulder 13 at each end of the piston. Farther is a set of spring claws 14 which are fitted with an assembly flange 15 form a whole, by screws 16 on each End of the cylinder 5 attached. The spacer sleeve 3 and the Nut 4 bind end stops with the cylinder end pieces work together and it can be seen that when the spacer sleeve 3 rests against the cylinder end, which

in

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is shown in Fig, 1 on the right side, the claws 14 of the "adjacent set of claws" engage in the recessed shoulder 13 at this end of the piston 1 the sleeve 7 is in the illustrated right position, in which one of the two Uockennuten 17, which is in the inner Surface of the sleeve are formed, a thumb 18 is opposite, which extends from each spring claw 14 to the outside extends. It is an advantage of the type of attachment described the spring jaw 14 by means of the flange 15, that it is thereby possible to increase the stroke of the piston in a simple manner shortened by placing a spacer or packing on the back of the flange, whereby the claws are kept further away from the end of the cylinder and this arrangement acts as an end stop for the The piston rod stops, so that the insertion of the spacer pieces matches the end of the piston stroke and the piston position at which the locking takes place is not affected. When pressure on the- shown right-hand end of the cylinder 5 is abandoned, this acts on the main piston 1 and the auxiliary piston 7 a. Initially, however, the main piston begins to move prevented by the engagement of the claws 14 in the adjacent shoulder 13 and only the auxiliary piston sleeve 7 can move to the left within the limits determined by the width of the hat 9. This movement of the auxiliary piston , 7 moves the lute 17 out of its aligned position with respect to the Thumb 18 of the claws 14. As a result, the claws 14 are pressed inward against the spring action. It follows that

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the claws release the recessed shoulder 13 and the Release main basket 1, which can now begin its movement. The same movement of the auxiliary piston relative to the The main piston has moved the second groove 17 into a position relative to the second recessed shoulder 13 that exactly corresponds to the position shown at the right end. Of the Piston can therefore be at the opposite end of its stroke locked and can therefore be held at this end until pressure is applied to the left end of the cylinder to move the piston back into the position shown.

Claims

80980 9/02 76

Claims (1)

a% * e η t talks 1, j Working piston actuatable by oil pressure of a fluid medium, characterized by a main piston which is attached to a piston rod for movement along a cylinder between two end stops, two sets of spring claws, which are effective at the ends of the piston stroke, around the piston to lock against a movement to the other end, an auxiliary piston, which is movable in the longitudinal direction of the cylinder by a limited distance relative to the main piston and which, when this is moved from one end position relative to the piston to the other, is effective to by a squatting effect to move the locking claw set at the end of this movement out of its engagement divisions, allowing the other locking claw set to lock the piston at the opposite end of its movement stroke _f 2. Device according to claim 1, characterized in that the auxiliary piston has a sleeve which is in the Cylinder slides and the sealing surrounds the main piston in such a way that this sleeve riiqef the pressure . presents in each cylinder end. 5, jlijartchtung according to claim 1 or 2, characterized in that the claws are in a resilient or resilient ^V ' ^{/ V} > ^ / manner 8 03 8 0 9/027 6 Way at each cylinder end "are attached and such are designed and arranged so that they are saved in a housing Engage the shoulder in a coaxial bore at the adjacent end of the piston. 4. Device according to one of the preceding claims, characterized in that each claw has an outwardly protruding thumb that is resilient or resiliently in the inner surface of the sleeve-shaped Auxiliary piston engages, which is provided with circumferential grooves that oppose the thumbs of the resilient claws of each set when the piston is on . neighboring areas of its stroke and if see the auxiliary piston at the end of its stroke relative to the main piston in the direction of the previous piston movement is located 80980S / Q276