JPS6237243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of a cylinder case with a cover and a piston, and seals the main hole of the piston chamber exhaust hole, which consists of a main hole and a throttle hole. This invention relates to a damping device that performs braking.

Such shock absorbers, which are often used, for example, in the door cylinders of door closing devices, are listed in document number 18 of Catalog Collection 18 of the production materials (Europe Catalog) of Wabko Wästeinghaus Gesellschaft Mituto Beschulenktel Haftsung GmbH.
422802 to 422808. These devices dampen the piston movement in the final stage by deflecting the cylinder exhaust by means of a radial packing through a throttle hole.

In order to better understand the operation of these known devices, a suitable device will be described in detail below with reference to FIG.

The door cylinder consists of a cylinder case 1 and a piston 2 provided in the cylinder case, the piston rod 3 of which is pivotally connected to the door (for example by a transmission rod). The piston rod 3 and the piston 2 are configured such that the piston rod 3 has a large diameter section 6 near the piston 2 and the piston 2 has a bolt 7 on the side facing the piston rod 3. The side walls 4 and 5 of the cylinder case 1 are thickened so that they carry the large diameter part 6 of the piston rod 3 on one side 4 and the bolt 7 on the other side 5 (both with a limited longitudinal piston stroke). direction) so that it can be stored. At the same time both walls 4 and 5 are connected to the restrictor screw 10
or 10' and a connection 11 or 11' for the intake and exhaust holes 8 or 8' and 9 or 9' as well as for the radial seal 12 or 12' and the bearing piece 36. When compressed air is applied to the piston 2 for the opening and closing process of the door, for example via the connection 11', the throttle hole 9' and the hole 8', this piston 2 moves to the left and the cylinder chamber 13 is filled with the piston. The thickened portion 6 of the rod 3 shuts off the exhaust air by sealingly engaging the radial seal 12 and is mainly restricted until the exhaust air is exclusively through the throttled hole 9. By exhausting the cylinder chamber 13 through the closed hole 8, a perceptible damping effect is provided, so that the door does not hit violently.

On the opposite side, the bolt 7 is attached to the radial packing 1
By sealingly engaging 2', the same damping stroke is performed in the opposite direction.

In this configuration, in order to accommodate the piston rod large diameter portion 6 or the bolt 7 as a shock absorbing means, space in the axial direction exceeding the normal piston stroke is required on the cylinder side walls 4, 5, and the total length of the cylinder is increased. It is disadvantageous. In addition, radial gaskets 12 and 1 have the role of sealing the exhaust holes 8 and 8' during exhaust.
2' is in sliding contact with the large diameter portion 6 of the piston rod or with the bolt 7, and therefore wears out each time the piston moves.

A damping device is also known which has an annular check valve slidably mounted on the piston rod, the check valve closing the exhaust hole by means of a cylindrical coil spring acting as a damping spring from a certain piston stroke. (Jitsukai No. 50-9692). This design also disadvantageously lengthens the cylinder due to the additional structural space required for the cylindrical helical spring and the check valve. Also, a radial packing is required as an additional wear part between the piston rod and the annular check valve which can be slid on it. Furthermore, there is a disadvantage that the movable mass becomes large due to the check valve, coil spring, etc. provided on the piston rod.

The object of the invention is therefore to provide a piston damper of the first type, which does not have the above-mentioned disadvantages, has a sufficient piston stroke even with a short overall length, and has a sealing element that does not wear out. .

In order to solve this problem, according to the present invention, the shock absorber provided on the cylinder end face has at least one
a spring element consisting of a conical coil spring and a leaf spring with a sealing element, the conical coil spring and the leaf spring are connected in series and engaged to transmit force, and the direction of action of these springs is determined by the movement of the piston. consistent with the direction.

Thus, according to the invention, the conical coil spring and the leaf spring holding the sealing element act as a buffer spring, so that the buffering effect of the spring is increased, and when compressed, the conical coil spring has all its windings removed. Due to the internal and external fit, the axial dimensions of the conical coil spring in the compressed state and hence the structural space are smaller than those of the cylindrical coil spring, making it possible to reduce the overall length of the cylinder.
The sealing element that closes the main hole serving as the exhaust hole is supported by the cylinder, which is a stationary part, together with the conical coil spring through the leaf spring, so these springs and the sealing element do not increase the movable mass of the piston. .

The present invention will now be explained in detail with reference to drawings showing embodiments.

The door cylinder shown in FIG. 2 consists of a cylinder case 21 with a cover 22 and a piston 23 arranged in this cylinder case, in which a piston rod 24 formed as a latch is adapted to mesh in a corresponding manner. It engages with the operating rod 25. On both sides of the range of motion of the piston 23, the case 2
1 to the end face 26 of this case and to the cover 22, respectively, are leaf springs 28 and 28', which retain sealing elements 27 and 27', respectively, which The elements are leaf springs 28 and 28', respectively.
is in such a position as to seal off the main exhaust holes 29 and 29' in the casing 21 and the cover 22, respectively, during the rebound. Main exhaust holes 29 on both sides
In addition to 29' and 29', when the main hole is closed, only a restricted exhaust is carried out which acts to dampen the final stroke of the piston, and the exhaust cross-section is changed by the throttle screw 31 shown in FIG. Get throttle exhaust hole 3
0 and 30' (Figure 4). According to the invention, each of the leaf springs 28 and 28' is one conical coil spring (hereinafter abbreviated as conical spring) 3.
2 and 32', which conical spring causes the piston 23 to close the sealing element 27 or 27' in the hole 29 or 2 via the conical spring 32 or 32' and the leaf spring 28 or 28' during the final movement.
It is located at a position where it presses against 9'.

Sealing elements 27 and 27' and conical spring 3
2 and 32' with leaf springs 28 and 2, respectively.
The manner of attachment to 8' is by snap attachment, with the conical springs 32 and 32' being such that all turns fit inside and out in a space-saving manner. The distance between the sealing elements 27 and 27' and the holes 29 and 29', respectively, must be so large that the holes are not automatically closed by the exhaust negative pressure of the sealing elements 27 and 27'.
By designing the bores 29 and 29' as stepped bores, the piston 23 can be retracted virtually without delay during air supply. Because Patsukin 2
This is because 7 immediately eliminates the gas pressure generated under this packing that resists the elasticity of the conical spring. Conversely, by selecting the size of the stepped hole, the piston can be retarded or advanced as desired.

FIG. 5 shows the adjusting screw 33 supporting the leaf spring 28.
shows an additional adjustment possibility of the buffer stroke.

After some free travel, the leaf spring 28 comes into contact with the adjustable support 33, thereby reducing the lever arm length of the leaf spring 28 relative to the conical spring 32, thus reducing the c- value is increased. By this measure, a greater deflection stroke is consumed in the conical spring 32 until the sealing element 27 contacts the hole 29. The advantage thereby obtained is a reduction in the remaining effective deflection and damping strokes.

Instead of the flat gaskets 27 and 27' attached to the leaf springs 28 and 28', gaskets provided annularly at the air supply and exhaust holes 29 and 29' are also attached to the case 21 and the cover 2, respectively.
Can be installed on 2.

The working cylinder, in which the piston rod is guided over a greater length because of the support 36 and the seal 37, provides an annular waste space 34 according to FIG.
This waste space is suitable for accommodating the shock absorber according to the invention without the need to extend the cylinder.

[Brief explanation of the drawing]

Figure 1 is the document number of the European Catalog of the Verabkove Estinghaus Gesellschaft Mitsut Beschülenkter Haftsung.
422808, FIG. 2 is a cross-sectional view of the shock absorber according to the present invention, and FIG. 3 is a cross-sectional view of the shock absorber according to the present invention.
4 is a partial sectional view of the throttle exhaust hole with a throttle screw of the device shown in FIG. 2, and FIG. 5 is a sectional view taken along line A, and FIG. Schematic representation of the conical spring arrangement; FIG. 6 is a partial sectional view of the actuating cylinder with an annular waste space; 21...Cylinder case, 22...Cover, 23...
Piston, 27... Sealing element, 28... Leaf spring, 29
...Main hole, 30...Aperture hole, 32...Conical spring.

Claims (1)

[Claims] 1. Consisting of a cylinder case 21 with a cover 22 and a piston 23, the main hole 29 of the piston chamber exhaust hole consisting of a main hole 29 and a throttle hole 30 is sealed to complete the piston stroke. In a shock absorber for an operating cylinder that brakes during motion, the shock absorber provided on the cylinder end face has at least one
The conical coil springs 32 and the plate springs 28 with the sealing elements 27 are connected in series and engage to transmit force, and the springs 32, A shock absorber for final braking of a piston, characterized in that the direction of action of 28 coincides with the direction of movement of the piston. 2. The leaf spring 28 is supported in the bending direction, the support part 33 is between the contact part between the conical coil spring 32 and the leaf spring 28, and the attachment part 35 of the leaf spring 28, and the support part 33 is formed as a screw. 2. The shock absorber according to claim 1, wherein the shock absorber is adjustable in height. 3. Shock absorber according to claim 1, characterized in that the sealing element 27 is arranged at the main hole 29 of the cylinder case 21 or the case cover 22. 4. The shock absorber according to claim 1, wherein the cross section of the throttle hole 30 is adjustable by a throttle screw 31.