JPS5845419Y2 - locking device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a locking device that allows a cover of equipment to be easily attached to and removed from the equipment body.

A conventional locking device is shown in FIGS. 1 and 2.

FIG. 1 is a perspective view for explaining the locking device before the cover is attached to the device body, and FIG. 2 is a perspective view for explaining the locking device after the cover is attached, in which 1 is a cover, 2
indicates a frame of the main body of the device, and a square hole 3 is provided in the frame 2.

Next, the internal structure and operation of the locking device will be explained.

4 is a holding metal fitting, 5 is a thumb screw, 6 is a movable piece, 7 is a coil spring, and 8 is a locking device such as an E-ring.

To assemble this, insert the male thread 5a of the thumb screw 5 into the holding metal fitting 4, pass it through the coil spring 7, screw it into the female thread 6a of the movable piece 6, and then attach the locking tool 8, so that the thumb screw 5 is attached to the holding metal fitting 4. It is held rotatably.

The axial movement of the thumbscrew 5 is restricted by the flange portion 5b of the thumbscrew 5 and the locking tool 8.

The locking device assembled in this manner is fixed to the cover 1 with screws or the like using the mounting holes 4a provided in the holding fitting 4.

To attach the cover 1 to the frame 2, first rotate the thumb screw 5 counterclockwise as shown in FIG. Place the cover 1 in a predetermined position relative to the frame 2.

In FIG. 2, when the thumbscrew 5 is rotated clockwise, the movable piece 6 is always pressed backward by the coil spring 7, so it follows the rotation of the thumbscrew 5, and the movable piece 6 turns sideways, with its tip end facing the frame body. It goes into the square hole 3 provided in the.

When the thumbscrew 5 is further rotated, the movable piece 6 moves forward with one side edge in contact with the lower wall 4b of the holding fitting 4, and stops when its tip is pressed against one side 3a of the square hole 3.

This completes the attachment of the cover 1 to the frame 2.

To remove the cover 1 from the frame 2, rotate the knob screw 5 counterclockwise, and the movable piece 6 will move rearward with the other side edge in contact with the upper wall 4C of the holding bracket 4. When the movable piece 6 moves to the end of the upper wall 4C, the direction of the movable piece 6 changes upward and returns to the state shown in FIG. 1, and the lock is released.

Such conventional locking devices have a large number of component parts and the shapes of the individual parts are complicated, so there are limits to miniaturization and cost reduction.

Also, since the elasticity of the coil spring was used, a large amount of force was required to rotate the knob screw.

Furthermore, under normal use conditions, it is normal to not be able to see the inside, and the position of the movable piece cannot be determined when viewed from the front of the cover, leading to operational problems such as forgetting to tighten a knob screw. There were drawbacks.

This invention was made to solve these drawbacks.
To provide a locking device which is characterized in that the number of parts is kept to the minimum necessary for functionality, and in addition to the rotation of a knob screw, the locking device can be moved from side to side.

The purpose is to reduce cost, miniaturize and prevent operational errors.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

3 to 5 show a first embodiment of the present invention, and FIG. 3 is a perspective explanatory view showing the structure of each member.

In the figure, 11 is a cover, 12 is a frame of the main body of the device, and the frame 12 is provided with a square hole 13.

14 is a round hole 14a made in the cover 11.
, and the square hole 14b.

15 is a knob screw, 16 is a metal fitting, and 17 is an E-ring.

To assemble these, first, while inserting the male threaded portion 15a of the knob screw 15 into the round hole 14a of the irregularly shaped hole 14, screw it into the female thread 16a provided on the metal fitting 16.

At this time, the guide part 16b of the metal fitting 16 is inserted into the square hole 1 of the irregularly shaped hole 14.
Insert into 4b.

Next, the E-ring 17 is engaged with the groove 15b provided at the tip of the thumb screw 15, and the assembly is completed.

In other words, put the cover 11 between the knob screws 15 and the metal fittings 1.
6 will be screwed on from the front and back.

The operation of the lock device thus assembled will be explained with reference to FIGS. 4 and 5.

4 and 5 are cross-sectional views taken along arrow A shown in FIG.
FIG. 4 shows the state of the locking device before the cover 11 is attached to the frame 12, and FIG. 5 shows the state after the cover 11 is attached.

First, turn the knob screw 15 counterclockwise and pull it toward you to move it to the left.

At this time, the guide portion 16b of the metal fitting 16 is inserted into the square hole 1 of the irregularly shaped hole 14.
4b, the metal fitting 16 does not rotate following the rotation of the thumb screw 15, but moves in the axial direction of the thumb screw 15.

At this time, the metal fitting 16 is restricted from retreating by the E ring 17.

Also, the diameter of the male threaded portion 15a of the knob screw 15 is the square hole 14.
It must be smaller than the width of b.

In this state, as shown in FIG. 4, place the cover 11 in a predetermined position with respect to the frame 12, and move the knob screw 15 to the right. Enter 13.

Next, when the knob screw 15 is rotated clockwise, the metal fitting 16
The tongue portion 16C is pressed against one side 13a of the square hole 13, and the installation of the cover 11 is completed.

The state is shown in FIG.

Here, the thumb screw 15 is formed with a tapered portion 15C, and by making the maximum diameter of the tapered portion 15C slightly smaller than the diameter of the round hole 14a of the irregularly shaped hole 14, the cover 11 can be attached. The position of the metal fitting 16 can always be kept constant.

When removing the cover 11 from the frame 12, the above procedure may be reversed.

As explained above, in the first embodiment, the number of parts can be reduced by half and the shape can be simplified, so that a compact and extremely inexpensive locking device can be obtained.

In addition, the assembly procedure was conventionally a two-step process of first assembling the lock device and attaching it to the cover, but with the present invention, the lock device can be assembled and attached to the cover at the same time. It is possible to save labor in assembly work.

Furthermore, since the locking device according to the present invention is operated by two operations: rotating the thumbscrew and moving it left and right, it is possible to determine the state of the locking device from the outside based on the position of the thumbscrew, and it is possible to prevent problems such as forgetting to tighten the thumbscrew. This has the advantage of preventing operational errors.

In the first embodiment, the taper portion 15C was provided on the knob screw in order to keep the position of the metal fitting constant when the cover was attached.
A similar effect can be obtained by providing a stepped portion 18 as shown in the figure.

At this time, the diameter of the stepped portion 18 is made to match the maximum diameter of the tapered portion 15C in the first embodiment.

Further, in the first embodiment, an E-ring was used to limit the retreat of the metal fitting when the thumbscrew was rotated counterclockwise, but as shown in FIG. 7A, a recess 19 was provided at the tip of the thumbscrew. As shown in FIG. 7B, the same effect can be obtained even if the flange portion 20 is formed by applying plastic working such as spatula turning after screwing the metal fitting to the thumb screw.

As described above, the locking device according to the present invention has a simple structure consisting of a combination of a knob screw and a metal fitting, so it is inexpensive and easy to operate. It can also be used as a locking device.

[Brief explanation of the drawing]

1 and 2 are perspective explanatory views of a conventional locking device, FIG. 3 is a perspective explanatory view of components showing an embodiment of the locking device according to the present invention, and FIGS. 4 and 5 are illustrations of its operation. Explanatory diagram,
FIG. 6, FIG. 7A, and FIG. 7B are explanatory diagrams showing other embodiments of the present invention. 11...Cover, 12...Device body frame, 14...Irregular hole, 15...Knob screw, 16...Metal fittings, 17... E-ring, 18... Step portion, 19... Concave portion, 20... Flange portion.

Claims (4)

[Scope of utility model registration request] (1) In a locking device for attaching and detaching the cover of equipment to and from the equipment body, the cover 11 has an irregularly shaped hole 14 formed by a combination of a round hole 14a and a square hole 14b, and a male screw part 15a.
and a tapered portion 15C, the thumb screw 15 is inserted into the irregularly shaped hole 14 from the surface of the cover 11, and a guide portion 16b is movable in the axial direction of the thumb screw 15 as the thumb screw 15 rotates. The cover 1 has a tongue portion 16C formed perpendicularly to the guide portion 16b.
1 and a metal fitting 16 inserted into the irregularly shaped hole 14 from the back side of the locking device. (2) The locking device according to claim 1, which is a registered utility model, characterized in that a groove portion 15b is provided at the tip of the male screw portion 15a. (3) The locking device according to claim 1, which is a registered utility model, characterized in that a four part 19 is provided at the tip of the male screw part 15a, and a flange part 20 is formed by plastic working such as spatula turning. (4) The locking device according to claim 1, wherein the knob screw 15 is provided with a stepped portion 18.