JP2572142Y2 - Operation key unit mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation key unit mounting structure, and more particularly to an improvement of a detachable fixing structure.

[0002]

2. Description of the Related Art An electronic device such as a measuring device controlled by a microprocessor is generally provided with a plurality of operation keys for operating each part and setting various parameters. In many cases, these operation keys are integrated into an apparatus body as an operation key unit.

Conventionally, various methods of attaching such an operation key unit have been put into practical use, such as attaching with an adhesive tape (in the case of a sheet key unit), screwing, and opening and closing with a hinge mechanism and a latch mechanism.

[0004]

[Problems to be solved by the invention] However, these methods involve a change in the mounting state due to a decrease in the adhesive force. The assembly and adjustment work using a plurality of parts becomes complicated and the number of steps increases. There are problems such as a decrease in position repeatability due to the

An object of the present invention is to solve such a problem, and an object of the present invention is to realize an operation key unit mounting structure capable of obtaining a stable mounting state by a simple operation with a small number of parts.

[0006]

According to the present invention, there is provided a structure for detachably mounting an operation key unit incorporating a plurality of operation keys on a part of a main body. A plurality of mounting holes formed in the main body, a plurality of claws formed in a substantially L-shape on a surface facing the mounting portion of the main body of the operation key unit so as to engage with the mounting holes of the main body, and at least one of the main body. Integrated into the mounting hole
And a plurality of spring members that are displaced by the engagement of the claws with the mounting holes and latch so that the claws do not fall out of the mounting holes.

[0007]

When mounting the operation key unit, the claws formed on the operation key unit are engaged with a plurality of mounting holes formed on the mounting portion of the main body.
The spring member is displaced and latched so that the pawl does not fall out of the mounting hole. When removing the operation key unit, the spring member is displaced so as to release the latch state of the claw.

Thus, the operation key unit can be attached and detached with a simple operation, and a stable attachment state can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a main part of an embodiment of the present invention. In the figure, reference numeral 10 denotes an operation key unit, and reference numeral 20 denotes a main body frame to which the operation key unit 10 is detachably attached.

The operation key unit 10 includes a case 11 formed of a synthetic resin in a substantially rectangular parallelepiped shape, and a case 11 in which a key top is located on the surface of the case 11.
A plurality of (six in this embodiment) push-button switches 12 housed inside the case 11 and a substantially L-shaped plurality (this embodiment) formed so as to protrude from the back surface of the case 11 in the direction of extension of the side surface. In this case, four nails 13 are provided.
It is assumed that the switch 12 is mounted on one common printed wiring board.

The frame 20 of the main body is also integrally formed of a synthetic resin into a predetermined shape. That is, a plurality of (four in the present embodiment) mounting holes 21 with which the claws 13 formed on the operation key unit 10 are engaged are formed in the mounting portion facing the operation key unit 10. Further, a spring member 22 for latching the engaged claw 13 so that the claw 13 does not fall out of the mounting hole 21 is integrated with some of the mounting holes 21 of the mounting holes 21. Also,
The operation key unit 1 is attached to a mounting portion of the frame 20.
A plurality of protrusions 23 for preventing bending of the printed circuit board on which the switch 12 housed in the switch 0 is mounted due to the operation of the switch 12 are also integrated.

FIGS. 2A and 2B are explanatory views of attachment of the operation key unit in such a configuration, wherein FIG. 2A is a cross-sectional view of a main part before engagement, FIG. FIG. 4 is a cross-sectional view of the main part after engagement, and FIG. 4D is a rear view in the state of FIG.
First, the claw 13 of the operation key unit 10 is inserted into the mounting hole 21 of the frame 20 as shown by the arrow (A).
In this state, the claw 13 of the operation key unit 10 does not bias the spring member 22 of the frame 20 as shown in FIG.

Next, the operation key unit 10 is moved in the direction shown by the arrow (C) from the state in which the claw 13 of the operation key unit 10 is inserted into the mounting hole 21 of the frame 20,
The thick portion of the frame 20 is sandwiched between the L-shaped portions of the claws 13. At this time, the claw 13 of the operation key unit 10 is (D)
As shown in FIG. 5, the spring member 22 is slid on the tapered surface of the spring member 22 of the frame 20 to urge and displace the spring member 22 in the direction indicated by the arrow. Return to.

As a result, the claw 13 of the operation key unit 10
Will be latched by the spring member 22 while being engaged with the mounting hole 21 of the mounting portion of the frame 20, and the operation key unit 10 will be fixed to the mounting portion of the frame 20 in a stable state. Then, when the key top of the switch 12 is pressed in such a fixed state, the switch 1
2 is mounted on the printed circuit board.
The operation is regulated by the opposing projections 23, and a stable operation feeling can be obtained.

When removing the operation key unit 10 from the frame 20, the spring member 22 is displaced in the direction shown by the arrow in FIG. 2C, the state in which the thick portion of the frame 20 is sandwiched by the L-shaped portion of the claw 13 is released, and the operation key unit 10 is moved in the direction indicated by the arrow in FIG. Is moved to pull out the claw 13 from the mounting hole 21 of the frame 20.

With this configuration, the mounting state does not change due to a decrease in the adhesive force unlike the conventional fixing using an adhesive tape, and the number of parts is extremely reduced. Since there is no mechanism for rotating the operation key unit in terms of structure, the reproducibility of the mounting position of the operation key unit does not decrease due to wear of the mechanism.

Although the above embodiment has been described with reference to an example in which four claws and four mounting holes are provided, and two of the mounting holes are provided with spring members, the present invention is not limited to these combinations. Further, the shape of the projection is not limited to the embodiment, and various modifications are possible.

[0018]

[Effects of the Invention] As described above, according to the present invention,
An operation key unit mounting structure that can obtain a stable mounting state by a simple operation with a small number of parts can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory view for attaching the operation key unit of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Operation key unit 11 Case 12 Switch 13 Claw 20 Body frame 21 Mounting hole 22 Spring member 23 Projection

Claims (1)

(57) [Scope of request for utility model registration] An operation key unit incorporating a plurality of operation keys is detachably attached to a part of a main body, wherein a plurality of mounting holes formed in a mounting portion of the main body, a main body of the operation key unit. a plurality of claws formed on the substantially L-shaped so as to engage the mounting hole of the body to the mounting portion and the opposing surfaces of the pawl is engaged with the mounting holes are integrated into at least a portion of the mounting hole of the body And a plurality of spring members that are displaced by the latch and latch so that the pawl does not fall out of the mounting hole.