JPS628714Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a locking device for a handle that opens and closes a valve.

A conventionally known locking device for a valve opening/closing handle, as shown in FIGS. 1 to 4, has a lock bolt 2 screwed into an output shaft 1 having a handle from a direction perpendicular to the axial direction, and the tip of the lock bolt 2 is output. The shaft 1 is pressed against the shaft 1 to lock it, and a lock lever 3 screwed into the lock bolt 2 is used to prevent the lock bolt 2 from loosening. When the lock lever 3 is tightened in the direction of the output shaft 1, internal stresses f ₁ and f ₂ act in the opposite direction between the lock lever 3 and the holder 4 into which the lock bolt 2 is screwed.
occurs as shown in FIG. This increases the frictional resistance of the contact surface 5 between the lock lever 3 and the holder 4, the contact surface 6 between the lock bolt 2 and the holder 4, and the contact surface 7 between the lock bolt 2 and the lock lever 3, and prevents the lock bolt 2 from loosening. is achieved.

However, in such a lock structure,
When the lock lever 3 is tightened, the tightening force acts on the lock bolt 2 in the opposite direction to the tightening force, resulting in a disadvantage that the locking force of the lock bolt 2 is reduced.

This invention is an attempt to eliminate such drawbacks found in conventional locking devices, and the technical problem is to provide a locking device that does not have the risk of reducing its locking force when activated. shall be.

The technical means devised to solve this technical problem is to freely rotate a circular hole of a lock lever having an inner diameter slightly larger than the outer diameter of the output shaft on the outer periphery of the output shaft having a handle for opening and closing the valve. Insert it into the
The output shaft and the center of the lock lever are arranged eccentrically so that the inner peripheral surface of the circular hole can collide with the outer peripheral surface of the output shaft by rotation of the lock lever, and the lock lever can be fixed with a lock bolt. shall be.

Such technical means work as follows. That is, since the center of the output shaft and the center of the lock lever are eccentric, the inner peripheral surface of the circular hole of the lock lever comes into pressure contact with the outer peripheral surface of the output shaft, thereby locking the rotation of the output shaft. Preventing the lock lever from loosening is accomplished by tightening the lock bolt to prevent rotation of the lock lever.

The present invention has the following unique effects.

Since the center of the output shaft and the center of the lock lever are eccentric, the rotation of the output shaft can be locked simply by rotating the lock lever, making locking operations extremely easy. The lock can be prevented from loosening simply by fixing it with the lock, the lock is securely prevented from loosening, and there is no risk that the locking force will decrease on its own.

Next, specific examples of the above technical means will be explained with reference to the drawings. Referring to FIGS. 5-10, the locking device includes an output shaft 10 having a handle.
A lock lever 1 with a circular hole 11' inserted into the outer periphery of the lock lever 1.
1, a lock bolt 12 for fixing the lock lever 11, and a lock block 13, and the center of the circular hole 11' of the lock lever 11 is located eccentrically with respect to the center of the output shaft 10. A long arc-shaped hole 14 is formed in the lock lever 11, and a lock bolt 12 is inserted through the long hole 14 and screwed into a lock block 13. lock bolt 12
When tightening, the lock lever 11 is pressed against the outer surface of the lock block 13 and is fixed. still,
Of course, the lock lever 11 may be fixed by means other than the lock bolt 12 inserted through the elongated hole 14.

The center of the output shaft 10 and the circular hole 1 of the lock lever 11
Since the center of the lock lever 1' is eccentric, when the lock lever 11 is rotated, the inner circumferential surface of the circular hole 11' of the lock lever 11 comes into pressure contact with the outer circumferential surface of the output shaft 10, and the output shaft 10 is locked. After locking, tighten the lock bolt 12 to fix the lock lever 11,
Prevent the lock from loosening.

Referring to FIG. 9, P is the center of the outer circle _C1 of the lock lever 11, and _P1 is the circular hole 1 of the lock lever 11.
1' is the center of the inner circle _C2 , _P2 is the outer circle of the output shaft 10
The inner circle _C2 of the lock lever ₁₁ and the outer circle _C3 of the output shaft 10 are not in contact with each other and are in an unlocked state.

As shown in FIG. 10, when the lock lever 11 is rotated by an angle α, the lock lever 11 rotates around the outer circle C ₁
Since the lock lever 11 rotates with respect to the center P, the center _P1 of the inner circle C2 of the lock lever ₁₁ moves to P _A with P as the center, with the eccentricity R as the radius. As the center _P1 of the inner circle _C2 of the lock lever 11 moves to P _A , the inner circle _C2 of the lock lever 11 comes into contact with the output shaft outer circle _C3 at the position of surface D, and the output shaft 11 is locked. . The locking force of the lock lever 11 can be increased by making the surface of the inner circle _C2 of the lock lever 11 a rough surface.

[Brief explanation of the drawing]

Figures 1 to 4 show a conventionally known locking device, with Figure 1 being a plan view, Figure 2 being a sectional view of the main parts, Figure 3 being a side view, and Figure 4 showing the relationship between the lock lever and the lock bolt. Figures 5 to 10 show a locking device according to this invention, and Figure 5 is a plan view;
FIG. 6 is a side view, FIG. 7 is a plan view of the main part, FIG. 8 is a side view of the main part, and FIGS. 9 and 10 are diagrams showing the relationship between the output shaft and the lock lever. 10...Output shaft, 11...Lock lever, 1
1'...Round hole, 12...Lock bolt, 13...
Lock block, 14... Long hole, C ₁ ... Lock lever outer circle, C ₂ ... Lock lever inner circle, C ₃ ...
Output shaft outer circle, P...center of lock lever outer circle,
P ₁ , P... Center of lock lever inner circle, P ₂ ... Center of output shaft outer circle, D... Contact surface.

Claims (1)

[Scope of utility model registration request] A circular hole of a lock lever having an inner diameter slightly larger than the outer diameter of the output shaft is rotatably inserted into the outer periphery of the output shaft that has a handle for opening and closing the valve, and the inner peripheral surface of the circular hole is output by rotation of the lock lever. A locking device for a valve opening/closing handle, characterized in that the output shaft and the center of the lock lever are arranged eccentrically so as to be able to freely collide with the outer peripheral surface of the shaft, and the lock lever can be fixed with a lock bolt.