JPS5983810A - Cylinder stop device - Google Patents

Abstract

PURPOSE:To lock a rod at a low-price and in a compact structure by lengthwide dividing a cylinder, the outside diameter and the inside diameter of which are eccentric and piercing a cylinder rod therethrough, enclosing the cylinder with a housing, and rotating two divided half cylinders in the opposite direction. CONSTITUTION:A cylinder is lengthwise divided at the maximum thickness portion and the minimum thickness portion to form a brake discs 2, 2'', which are fixed in a housing 5. When force is applied to levers 3, 3'' in respective arrow directions 4, 4', the discs 2, 2' are turned in the opposite direction, so that as the center of the disc and a position are eccentric, the disc 2 is pushed downward, and the disc 2'' is pushed upward by storing force by principle of levers to lock the piston rod 1. In case of unlocking, the lebers are turned in the opposite direction to the arrows 2, so that a line connecting the maximum thickness portion and the minimum thickness portion is aligned with the center line of a cylinder 6 to be set free the piston rod 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for locking a cylinder rod in the middle.

Conventional cylinder rod stopping devices include a collet chuck method and a method of prying the cylinder rod, but both methods have problems with their service life. There is also a method of locking by generating hydraulic pressure, but although it is superior in terms of life, it has the drawback of high cost. There are also FIG. 1 (front view) and FIG. 2 (cross section) in a manner that is relatively similar to the present invention.

This method will be explained with reference to FIG. 1. When the screw rod 1' passes through the inner diameter of the eccentric brake disc 2', the piston rod 1' can freely slide. and Niroga,
When lever 3', which is directly connected to brake disc 2', is pushed in the direction of arrow 4' to apply rotational force to brake disc 2', the force of piston rod 1' is increased by the lever principle due to its eccentricity, and it moves in the direction of arrow 5'. It is pressed against the flaky knee 6' and locked by frictional resistance.

However, this method has the disadvantage that when the brake disc 2' rotates, a force is exerted that causes the piston and the rod 1' to rotate together. In addition, since the pushing point 5' and the resisting point 6' are far apart when locked, shearing force acts on the piston opening and door 1', which not only has a negative effect on the screw 1-rod 1' but also lengthens the brake section. There is.

The object of the present invention is to eliminate these drawbacks and provide a low-cost, long-life, and compact cylinder stop device.

Next, this invention will be explained based on the drawings. FIG. 3 is a front sectional view of the invention, and FIG. 4 is a cross sectional view thereof.

A piston rod 1 directly connected to a piston 7 built into a conventional general cylinder 6 protrudes outside, and slides without play on the inner diameter of brake discs 2, 2' which are eccentric to the piston rod 1 and divided into symmetrical parts. Penetrate the piston rod 1 as much as possible. Furthermore, brake disc 2,2"
The outer diameter and both ends of the brake housing 5 are surrounded by a brake housing 5 and fixed to the cylinder 6 so that the brake discs 2 and 2' can slide freely, and the levers 3 and 3'' are directly connected to the brake discs 2 and 2', respectively, and the levers 3 and 3'' are connected directly to the brake discs 2 and 2'. Lever 3°3″ protrudes to the outside.

Now, to explain the operation, when force is applied to the levers 3 and 3' in the directions of arrows 4 and 4 //, the brake disc 2
, 2' are applied with rotational forces in opposite directions. However, since the centers of the brake discs 2, 2' and the piston rod 1 are eccentric, the brake force is increased by the principle of leverage and pushed to the right.

Therefore, the piston rod 1 is locked between the brake discs 2 and 2''.

To release the lock, return the levers 3, 3' in the direction opposite to the arrows 4, 4h to free the brake discs 2, 2''.

Of course, rotational force also acts on the piston rod l, but since the rotational directions of the brake discs 2 and 2' are opposite, the rotational force is canceled out. Therefore, compared to the method shown in Figs. 1 and 2, not only does the piston rod 1 not rotate, but the pushing point and the drag point are opposite each other, so no shearing force is applied to the piston rod 1, and the braking section is also shortened. .

As explained above, this invention uses the lever principle to increase frictional force and apply a brake to the piston rod, but compared to conventional methods, this invention has a longer lifespan, is more compact, and is extremely inexpensive. This is a very good invention that can lock the cylinder piston rod.

[Brief explanation of the drawing]

FIG. 1 is a front cross-sectional view of a conventional structure similar to the present invention, FIG. 2 is a cross-sectional view of a conventional structure similar to the present invention, FIG. 3 is a front cross-sectional view of the present invention, and FIG. 4 is a cross-sectional view of a conventional structure similar to the present invention. Sectional view. l, 1'... Piston rod 2.2', 2'... Brake disk 3.3', 3
”...Lever 4, 4/, 4//...
...Arrow in the direction of pushing force 5, l--Brake housing 2nd figure 412

Claims (1)

[Claims] A cylinder with eccentric outer and inner diameters is vertically divided into the thickest part and the smallest part, and a cylinder rod that can slide without play is passed through the inner diameter of the cylinder, and the outer diameter and both ends of the cylinder are surrounded by a housing without play. A cylinder stop device that locks and releases a cylinder rod by rotating two divided semi-cylinders in opposite directions.