DE8229832U1 - Working cylinder - Google Patents

Description

9285

Working cylinder

The innovation concerns a working cylinder with a movable piston on a non-self-locking thread a rotatable spindle.

Working cylinder of the type mentioned in which the piston ■ 'on a rotatable and with a non-self-locking

Threaded spindle is arranged and the KoI- ' ben can be locked in any position

known.

For example, DE-AS 20 39 296 discloses a working cylinder with mechanical support in which

, at one end of a threaded spindle

-. Del a piston and a support foot is arranged at its other end.

The piston is locked in every position in that the longitudinally displaceable spindle under load Ί brings the support foot into frictional engagement with the Bo <i <»: i of the working cylinder. until> by supplying pressure medium into a recess in the bottom, the frictional engagement is canceled again by lifting the support foot. As a result, the spindle can be rotated again and the piston can be moved again because of the non-self-locking thread.

In this cylinder required for dio locking the piston accurate adjustability is thus ^Ä of the supporting foot very difficult to achieve the permissible longitudinal displacement of the spindle and 'and

In addition there is the danger that the _t extended piston furled under load again ,, since no co

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if provided are those by a direct attack Prevent the piston from rotating ι

It is the task of the NeUerUngj ^{to create a working cylinder 1} in which the piston can be locked in any position with or without load by simple means and remains locked in its respective position even under heavy load.

The task is through the in the characterizing part of the Protection claim listed features solved.

An embodiment of the innovation is in the drawing shown and described in more detail below.

Show it

1 shows a schematically simplified longitudinal section through a working cylinder,

Figs 2 show a section along the line A-A in schematic form Depiction.

According to Fig; 1 is in a working cylinder 1 a piston 2 with an internal thread, not shown, on a non-self-locking external thread 3 of a Spindle 4 arranged. On the piston 2 is on its circular end face 5 and eccentric to their In the middle 6 a force application fitting 7 is attached.

At the end 8 of the spindle 4 remote from the piston, it is rotatably mounted in a bearing 9 and has a brake disc 10 provided. Perpendicular to the brake disc 10 are in chambers 11, 12 of the working cylinder 1 brake pistons 1.3, 14 arranged, which are equipped with brake linings 15, 16

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are equipped and loaded by means of disc springs 17, 18 act on the brake disc 10.

On the brake pistons 13 and 14, pressure plates 19, 20 are provided in the chambers 11, 12, against which the plate springs IJ, 18 are supported on one side and which can be acted upon by a pressure medium on the other side.

As can be seen from Fig. 2, runs in the working cylinder 1 between the brake piston 13, 14 and thus between the chambers II, 12 a bore 21. This Bore 21 is via a further bore 22 extending parallel to the spindle 4 with an entry line 23 for the piston 2 connected. In the working cylinder there is also one leading into a further chamber 24 Extension line 25 is provided for extending the piston 2.

At the end 8 of the spindle 4 remote from the piston, this is provided with a polygonal one extending out of the working cylinder 1 Pin 26 is provided for manual actuation of the spindle 4.

The working cylinder according to the innovation works as follows:

By means of the in the chambers 11, 12 on the brake piston 13, 14 and therefore cup springs 17, 18 acting against the brake disk 10 of the spindle 4, the piston 2 is in can be locked in any position.

To extend the piston 2, in addition to the supply of pressure medium such as pressure oil via the extension line 25 also pressurized medium of the entry line 23 into the further chamber 24 and thus via the further bore 22

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and the bore 21 is fed to _{the chambers 1I 1 12.}

Due to the difference in size of each thus applied surfaces of the pressure medium acts ael · retraction line 23 against the urging force of the plate springs 17j 18 to the printing plates 19, 20 of the brake piston 13 ₃ 14 · This dissolve the brake pistons 13, 14 from the brake disk 10 of the spindle 4 and release this for a rotary movement so that it can extend piston arranged on its non-self-locking thread 3.

When the piston 2 is retracted, it is therefore sufficient to release the brake piston 13 »14 if the pressure medium only the entry line 23 is supplied.

An automatic retraction of the piston 2 on the spindle 4 under a load is ensured by the eccentric Arrangement of the force introduction fitting 7 on the end face 5 of the piston 2 is prevented.

The advantages achieved with the innovation are iris specific in that the piston can be operated manually and is reliable in any position regardless of the load can be locked because by means of the eccentric introduction of force on the piston, this also under cannot retract automatically under high loads. Keben the necessary pressure medium for the retraction and extending the piston are also no further means of energy or energy supplies to the working cylinder required for locking or loosening the plunger.

Claims (1)

re · » a aft »· M ο- "· 2I.IO.I982 BTOl Ka / th em 9285 Working cylinder Claim to protection Working cylinder with a movable piston on a non-self-locking thread of a rotatable spindle, characterized in that the piston (2) has a force introduction fitting (7) eccentrically to the center (6) of its circular end face (5) and that on the spindle (4) A brake disc (10) is attached to its end (8) remote from the piston, to which perpendicular spring-loaded brake pistons (13> 14) provided with brake linings (15, 16) are arranged, with a bore (21) between the brake pistons (13> 14) in the working cylinder (1) is provided, which is connected via a further, parallel to the spindle (4) extending bore (22) with an entry line (23) arranged in this for the piston (2).