JPH0425895Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a simple lock particularly useful as a lock for a switchboard.

(Prior Art) FIG. 7 shows a typical conventional switchboard lock.

The lock B prevents the rotary body 51 from coming out backward in the outer cylinder 50 by storing a ball 54 extending between the hole 52 of the outer cylinder 50 and the annular groove 53 of the rotary body 51, and preventing the ball 54 from coming off from the hole 52. This is achieved by closing the opening of the hole 52 with a cover 55.

By the way, this type of lock B is attached to the door C with a nut 56, and the key K also serves as a handle for opening and closing the door. Therefore, especially the insertion force when inserting the key K and the pushing force when closing the door are applied to the ball 54 through the rotating body 51,
As the load is impactful and repeated, the caulked portion of the cover 55 becomes loose, the cover 55 comes off, the ball 54 flies out, and the rotating body 51 itself falls off, causing a structural problem. That is, a hole 52 for inserting a ball 54.
However, when the cover 55 that closes the hole 52 comes off, it becomes an opening for the ball 54 to fall out.

(Problems to be Solved by the Invention) The problems to be solved by the invention are to provide a robust structure in which the rotary body does not fall off even when subjected to a strong and repeated impact load.

(Means for Solving the Problems) The means taken by the present invention to achieve the above-mentioned problems is to attach the rear end of the coaxial hole to the large diameter shaft hole after the front key insertion opening in the outer cylinder. A rotatable floating body with a key guiding groove and a rotating body having a key fitting groove that matches the front key guiding groove are inserted from the opening, and a pin hole is inserted into the rotating body around the rotation axis in the shaft hole. A spring is provided in the pin hole, and a shaft pin is biased by the spring and the tip of the pin is loosely fitted into the annular groove. It is characterized by

(Function) The shaft-like pin is embedded between the pin hole on the rotating body side and the annular groove on the shaft hole surface on the outer cylinder side, and there is no part that can protrude outside the outer cylinder, and The shearing strength, that is, the ability to withstand more than a common sense load, prevents the rotating body from coming off from the outer cylinder, and this relationship of preventing it from coming off is maintained by the force of the spring.

(Example) An example of implementing the present invention will be described in detail below.

A in the figure is a simple lock, and this simple lock A has outer cylinder 1.
A lid 12 is pivotally supported on the front surface where the key insertion opening 2 is formed, and the key insertion opening 2 is exposed by swinging the lid 12 along the same surface. A large-diameter shaft hole 3 after the key insertion opening 2 has a floating body 4 having a key guiding groove 5 from its rear end opening, and a rotating body having a key fitting groove 7 on the front side that matches the front key floating groove 5. A pin hole 8 is provided in the rotating body 6 so as to radially coincide with an annular groove 9 provided around the rotation axis in the shaft hole 3. The pin tip 11 a is biased by the spring 10 and has a shaft-shaped pin 11 loosely fitted in the annular groove 9 so that the floating body 4 and the rotating body 6 can rotate, respectively, and the shaft hole 3 This prevents it from slipping out backwards through the rear end opening.

The pin hole 8 has a bottomed shape or a through shape as shown in the drawing,
In the latter case, an axial pin 1 biased by a spring 10
1 and 11 have their pin tips 11a loosely fitted into the annular groove 9, so that the pushing force applied through the floating body 4 is evenly distributed and applied to both shaft-like pins 11, 11. ing.

Further, the lock A is provided with an element for regulating the rotation angle of the rotating body 6, that is, the lock piece 14, which is integrally attached to the rear end of the rotating body 6 with a nut 13, to be able to swing between the locked position and the unlocked position. Specifically, a stepped portion 15 is recessed at an angle of approximately 90 degrees along the rear end opening edge of the shaft hole 3, and the protrusion 16 of the rotating body 6 is inserted into the stepped portion 15.
The rotation can be restricted by contacting stoppers 15a, 15a at both ends of the stepped portion 15.

The lock A is also provided with an element that temporarily locks the rotating body 6, that is, the lock piece 14, into a locked state in which the key can be inserted and removed. The engaging groove 17 is recessed and the engaging groove 17 is recessed.
The ball 20, which is biased by a spring 19 in the ball hole 18 in the rotating body 6, engages releasably with the rotation of the rotating body 6 due to the unlocking operation, thereby locking the rotating body 6. The key can be inserted into and removed from the matching groove 7, and the lock piece 14 is temporarily locked in the locked state.

Figure 6 shows an example of the use of the simple lock A of the present invention installed on the door C of a switchboard, which eliminates the problem of the rotating body 6 falling out backwards as in the conventional product (Figure 7). In addition, the conventional product (Fig. 7) has a door C that allows the rotating body 6 and the lock piece 14 to be inserted and removed with the key and temporarily locked in the locked state.
This is a completed product with a temporary locking function, which eliminates the trouble of interposing a spring 58 between the nut 56 and the lock piece 57 at the installation stage.

(Effect of idea) Therefore, the present invention has the following advantages.

Since the shaft pin is installed inside the pin hole and the annular groove without an exit, there is no risk of it falling off, and the rotating body has a robust structure that will not come off unless the pin is sheared. .

Since the shaft pin has a high shear strength, it can withstand rough handling and is useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing one embodiment of the simple lock of the present invention. FIG. 2 is a rear view with the lock piece etc. removed. Third
The figure is a front view with the lid removed. FIG. 4 is a longitudinal sectional view taken along the - line. FIG. 5 is a longitudinal sectional view taken along the - line. Figure 6 is a usage diagram of the lock of the present invention installed on the door of a switchboard. FIG. 7 is a longitudinal sectional side view showing a conventional product. In the figure, 1 is the outer cylinder, 2 is the key slot, 3 is the keyhole, and 4
5 is a floating body, 5 is a key guide groove, 6 is a rotating body, 7 is a key fitting groove, 8 is a pin hole, 9 is an annular groove, 10 is a spring, 11 is a shaft pin, and 11a is a pin tip.

Claims (1)

[Scope of utility model registration request] A rotatable floating body that has a key guiding groove from the rear end opening of the coaxial hole to the large diameter shaft hole after the front key insertion opening in the outer cylinder, and a key fitting groove on the front that matches the front key guiding groove. A pin hole is provided in the rotating body so as to radially coincide with an annular groove provided around the rotation axis in the shaft hole, and a spring and a spring biased by the spring are provided in the pin hole. A simple lock with a shaft-shaped pin that loosely fits into an annular groove at the tip of the pin.