JPH092166A - Operation part mounting and demounting mechanism - Google Patents

Abstract

PURPOSE: To provide an operation part mounting/demounting mechanism to improve reliably of operation part drop preventing performance, increase a discharge amount of an operation part as a manufacturing cost is suppressed, and capable of detaching smoothly an operation part. CONSTITUTION: An operation part mounting/demounting mechanism comprises a body case 1; an operation part 2 removabley mounted on the front of the body case 1; and a lock member arranged on the body case 1 side and performing release operation to separate lock operation to engage the operation part 2 and an operation part from each other. Further, a rotatable hook member 16 is arranged on the body case 1 side and a hook claw part 17 is formed at the hook member 16. The hook claw part 17 is longitudinally moved through rotation of the hook member 16. Further, a groove part 18 engageable with the hook claw part 17 is formed at the bottom part of the operation part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation portion attaching / detaching mechanism for obtaining an anti-theft effect by, for example, detachably providing an operation portion of an on-vehicle electronic device in a main body case, and particularly, the operation portion is attached to the main body case. This is a modification of the operation part attachment / detachment mechanism that has a structure that prevents the operation part from falling off when it is removed from the side.

[0002]

2. Description of the Related Art In recent years, in-vehicle electronic devices such as audio devices have tended to be upscaled. However, accompanying the frequent occurrence of theft accidents of these devices, it has become a problem.
Therefore, as an electronic device having an anti-theft effect, a device using an operation unit attaching / detaching mechanism has been widely used. The operation section attachment / detachment mechanism is a mechanism in which the operation section including the switch section of the electronic device is detachably attached to the main body case.By using this mechanism, the user can remove only the operation section when leaving the vehicle. Can be carried. Therefore, the electronic device becomes unusable, and it becomes impossible to determine from the appearance whether or not the device body is installed in the vehicle. As a result, a high anti-theft effect can be obtained. Further, since the operation unit removed from the main body case is small and lightweight, it is easy to carry, and since it does not have a heating member such as an amplifier, it is safe because it does not get burned even if it is removed immediately after using the device.

By the way, since the on-vehicle electronic device is usually incorporated in the console panel of the vehicle, it is easy to operate.
The operation unit is provided on the front surface of the main body case. Therefore, when the operation section attaching / detaching mechanism is adopted in the electronic device, the operation section is attached / detached on the front surface of the main body case.
Therefore, when the operating portion is removed from the main body case, the operating portion may fall off unless the operating portion is pressed. For the purpose of preventing such an accidental drop of the operating part, an operating part attaching / detaching mechanism having a structure for preventing the operating part from falling has been conventionally proposed.

Here, a conventional example of an operation portion attaching / detaching mechanism having a structure for preventing the operation portion from falling will be specifically described with reference to FIGS. 11 to 18. 11 to 14 are drawings for explaining the main configuration of the operation unit attachment / detachment mechanism, and FIGS. 15 to 18 are drawings for explaining the structure for preventing the operation unit from falling off.

(A) Main Structure of Operation Unit Attachment / Detachment Mechanism In FIG. 11, reference numeral 1 is a box-shaped main body case for accommodating the main body of an electronic device, and 2 is a thin box-shaped operation portion that can be attached to and detached from the front surface of the main body case 1. The main constituent members of the operation unit attaching / detaching mechanism are these two members, the lock member 6 and the pressing member 7.

First, the main body case 1 will be described. FIG.
As shown in FIG. 2, a recess 1 a is provided on the front surface of the main body case 1. The recessed portion 1a is formed so as to be mounted and housed on the back surface of the operation unit 2, and the depth dimension thereof is set to such an extent that the back surface of the operation unit 2 can be placed. As shown in FIG. 14, a convex portion 1b engageable with the operation portion 2 side is provided on the right end side of the concave portion 1a. The front surface of the recess 1a of the body case 1 is the inner panel 10 (see FIGS. 12 and 14).

Further, as shown in FIGS. 12 and 14, a pressing member 7 is provided on the left end side of the recess 1a. Further, two rectangular restriction ports 1c are provided near the left end of the recess 1a, and the base of the lock member 6 is provided on the back side thereof. As shown in FIG. 14, the inner panel 10
A fixed end portion 1d is formed on the back side of the restriction port 1c at the right end (viewed from the front) of the restriction port 1c so as to project inward.

Next, the lock member 6 will be described. The lock member 6 performs a locking operation for engaging the operating portion 2 and a releasing operation for releasing the operating portion 2, and is a member having an L-shaped cross section as shown in FIG. Two key portions 6a are provided on the front end portion of the lock member 6 so as to be vertically arranged. The portions protruding from the restriction port 1c in FIG. 12 are these key portions 6a. An inclined surface 6b is formed at the tip of the key portion 6a. A constricted portion 6c is provided behind the inclined surface 6b, and a part of the operation portion 2 is engaged with and disengaged from the constricted portion 6c. At the left end of the rear surface of the lock member 6, a moving end portion 6d is provided so as to project. One end of the tension coil spring 8 is engaged with the moving end 6d, and the other end of the tension coil spring 8 is engaged with the fixed end 1d of the main body case 1.

Such a lock member 6 is provided in the main body case 1
It is attached to the side as follows. That is, as shown in FIG. 12, the lock member 6 is attached to the back side of the inner panel 10 so as to be slidable left and right (in the longitudinal direction of the recess 1a), and the key portion 6a is provided so as to project forward from the restriction port 1c. Has been. Therefore, the key portion 6a can be slid to the left and right within the allowable range of the restriction port 1c. Further, since the tension coil spring 8 is engaged between the moving end portion 6d of the lock member 6 and the fixed end portion 1d of the main body case 1, the lock member 6 is placed on the right side of the restriction port 1c by the tension coil spring 8. Being energized.

Next, the pressing member 7 will be described. The pressing member 7 is a member that presses the operation unit 2 in the direction of detaching it from the main body case 1 when the lock member 6 performs the release operation. As shown in FIG. 12, the pressing member 7 is provided in a hole provided on the left side of the restriction opening 1c in the recess 1a so as to be movable back and forth, and the front end surface of the pressing member 7 projects from the inner panel 10. A compression coil spring 9 is installed behind the pressing member 7, and the compression coil spring 9 urges the pressing member 7 toward the front side.

On the other hand, the operating portion 2 has a rectangular parallelepiped front portion 2a,
It has a configuration in which it is combined with a rectangular parallelepiped rear surface 2b that is slightly smaller than the front surface 2a, and only the rear surface 2b is mounted and stored in the recess 1a of the main body case 1. A recess 13 is provided on the right side of the back surface 2b of the operation unit 2 so as to engage with the projection 1b on the right end side of the main body case 1. Further, in the figure, the rear surface of the front surface 2a is designated as 2c. The width dimension and height dimension of the back surface portion 2b of the operation portion 2 are set to be slightly smaller than those of the concave portion 1a. This is because some clearance is required between the concave portion 1a and the back surface portion 2b when the operation portion 2 is removed from the concave portion 1a.

Alternatively, the operating portion 2 is provided with a locked portion 11 and a release member 12 (see FIG. 14).
Of these, the locked portion 11 is formed of a hole provided near the left side (as viewed from the front) of the back surface of the operation portion 2, and the lock member 6 is engaged and disengaged here. The release member 12 is provided on the front side of the locked portion 11 so as to be slidable in the front-rear direction. The front end of the release member 12 is a button portion 12a protruding from the front surface of the operation portion 2. Further, an inclined portion 12b corresponding to the inclined surface 6b of the lock member 6 is provided at the rear end of the release member 12.

(B) Storing operation of the operating section 2 The operating section attaching / detaching mechanism having the above-described structure mounts and stores the operating section 2 on the main body case side as follows. First, the convex portion 1b of the main body case 1 is engaged with the concave portion 13 of the operation portion 2. In this state, by pushing the operating portion 2 backward, the operating portion 2 is rotated in the clockwise direction about the engaging portion between the concave portion 13 and the convex portion 1b as an axis. Then, the right side edge of the locked portion 11 comes into contact with the key portion 6a of the lock member 6, the lock member 6 withdraws to the left side against the biasing force of the tension coil spring 8, and then the right side edge of the locked portion 11. The constricted portion 6c of the key portion 6a is engaged with the portion, and the lock member 6 returns to the right side. As a result, the lock member 6 is engaged with the locked portion 11 of the operation portion 2, and the back surface portion 2b of the operation portion 2 is attached to the main body case 1.
You have locked it on your side.

As described above, the operation unit 2 is provided with the main body case 1.
It is mounted and stored in the concave portion 1a. When the operation unit 2 is housed in the main body case side, since the back surface of the operation unit 2 presses the pressing member 7, the pressing member 7 moves rearward against the biasing force of the compression coil spring 9. doing.

(C) Removal Operation of Operation Section 2 Next, the operation of removing the operation section 2 from the recess 1a of the main body case 1 will be described. That is, when the operating portion 2 is in the stored state, as shown in FIG.
The second inclined portion 12b faces the inclined surface 6b of the lock member 6. In this state, the button portion 1 of the release member 12
When 2a is pressed, the inclined portion 12b presses the inclined surface 6b rearward. Then, a force that moves to the left acts on the inclined surface 6 b, and the lock member 6 moves to the left against the biasing force of the tension coil spring 8. Therefore, the constricted portion 6c is disengaged from the right edge of the locked portion 11. That is, this means that the lock member 6 has performed the release operation to disengage the operating portion 2.

At this time, the back surface of the operating portion 2 is pressed by the pressing member 7 which is subjected to the urging force of the compression coil spring 9. Therefore, when the lock member 6 is disengaged from the locked portion 11, the pressing portion 7 pushes the operation portion 2 forward. Since the concave portion 13 of the operating portion 2 and the convex portion 1b of the main body case 1 are engaged with each other, the operating portion 2 rotates in the counterclockwise direction about the engaging portion as a shaft, and the left edge portion of the operating portion 2 is moved. A portion including the portion (about ⅕ of the longitudinal dimension of the operating portion 2) protrudes from the concave portion 1a toward the front side. When the operator pulls out the operation section 2 that has come out to the front in this way by hand, the recess 13 and the projection 10 are disengaged, and the operation section 2 is disengaged from the recess 1a.

(D) Fallout Prevention Structure The above-mentioned operation portion attaching / detaching mechanism has the following fallout prevention structure for the operation portion 2. That is, this fall prevention structure
As shown in FIGS. 15 to 18, it is composed of a groove portion 14 formed in the bottom surface portion of the operation portion 2 and a claw portion 15 formed integrally with the main body case 1. The groove portion 14 extends in the thickness direction of the operation portion 2. The claw portion 15 projects upward and is slidably engaged with the groove portion 14. In addition,
When the operation portion 2 is stored in the recess 1a, the claw portion 15
Comes into contact with the back surface portion 2c of the operation portion 2 front surface portion 2a (see FIGS. 15 and 17).

In such a structure for preventing the operating portion 2 from falling off, when the operating portion 2 is removed from the recess 1a of the main body case 1, when the operating portion 2 comes forward due to the pressing force of the pressing member 7, the claw portion is released. 15 abuts on the rear end of the groove 14 (see FIG. 1).
6, see FIG. 18). As a result, the rotation of the operating portion 2 in the counterclockwise direction about the engaging portion between the concave portion 13 and the convex portion 1b is stopped. In this state, the portion including the left side edge of the operating portion 2 only protrudes from the concave portion 1a, and about 4/5 of the longitudinal dimension of the operating portion 2 remains stored in the concave portion 1a. Therefore, most of the back surface portion 2b of the operating portion 2 remains in the recess 1a, and there is no concern that the operating portion 2 will fall out of the main body case 1. In addition, the concave portion 1a is formed by the claw portion 15.
When the operation unit 2 stopped at the time is removed from the recess 1a, it is necessary to remove the operation unit 2 while manually lifting the operation unit 2 to remove the claw portion 15 from the groove 14.

[0019]

However, the above-mentioned operation portion falling-off preventing structure of the operation portion attaching / detaching mechanism has the following problems. That is, the claw portion 15 for preventing falling off
Since the main body case 1 is integrally formed, the claw portion 15
May be deformed under the influence of thermal deformation of the body case 1. If the deformed claw portion 15 bites into the groove portion 14, the operation portion 2 cannot be removed from the main body case 1 side. On the contrary, when the claw portion 15 is deformed and easily comes off from the groove portion 14, it becomes impossible to fulfill the function of preventing the operating portion from coming off, and the operating portion 2 is pushed by the pressing member 7 to force the operating portion 2 to move. Fall from the side.

Further, in order to surely stop the movement of the operating portion 2 when the pawl portion 15 is pressed by the pressing member 7, the pawl portion corresponds to the portion where the operating portion 2 projects from the concave portion 1a of the main body case 1. It is necessary to form the position 15 near the left edge of the recess 1a in the figure. In this way, in order to achieve the original function of preventing falling off, the claw portion 15 can be provided only in a specific place of the main body case 1, and the discharge amount of the operation portion 2 is small. But,
In order to smoothly perform the operation of detaching the operation portion 2 from the main body case 1 side, it is desirable that the discharge amount of the operation portion 2 from the recess 1a be large. Nevertheless, operation unit 2
If it is attempted to increase the emission amount of, the mechanism will be complicated and the size will be increased, and the manufacturing cost will increase. That is, it is difficult to increase the discharge amount of the operation unit 2 while suppressing the manufacturing cost.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object thereof is to improve the reliability of the operation portion falling prevention performance, and
An object of the present invention is to provide an operation unit attaching / detaching mechanism capable of smoothly removing the operation unit by suppressing the manufacturing cost and increasing the discharge amount of the operation unit.

[0022]

In order to achieve the above-mentioned object, the invention of claim 1 has a main body case, an operation portion detachable from the front surface of the main body case, and the operation provided on the main body case side. In an operating portion attaching / detaching mechanism including a locking operation for engaging a portion and a releasing member for releasing the operating portion, a hook member movable in the front-back direction is provided on the main body case side, and a hook is attached to the hook member. It is characterized in that a claw portion is formed, and a groove portion engageable with the hook claw portion is formed on the operation portion side.

According to a second aspect of the present invention, the hook member is rotatably provided with respect to the main body case so that the hook claw portion moves in the front-rear direction.

According to a third aspect of the present invention, a hook stopper is provided for restricting the position of the hook member so that the hook claw portion engages with the groove portion when the operating portion is attached to the main body case. .

[0025]

According to the invention of claim 1 having the above-mentioned structure,
Since the hook claw portion of the hook member is engaged with the groove portion on the operation portion side, it is possible to prevent the operation portion from falling off from the main body case when the operation portion is removed from the main body case. Further, in the present invention, since the hook member is separate from the main body case, the hook claw portion is not affected by thermal deformation of the main body case side. Therefore, due to the deformation of the hook claw portion, the operating portion cannot be removed from the main body case side, and conversely, the operating portion does not drop off from the main body case side.

Further, according to the present invention, since the hook claw portion also moves back and forth as the hook member moves in the front-back direction, the discharge amount of the operation portion increases and the operation portion can be smoothly removed. Generally, when the discharge amount of the operating portion is increased, the conventional technology causes a mechanical complication, but in the present invention, the discharge amount of the operating portion is very simple because the hook member is provided so as to be movable in the front-rear direction. Therefore, the manufacturing cost can be suppressed.

According to the second aspect of the present invention, since the hook member is rotatably provided on the main body case, when the operating portion is removed while being rotated about one side edge of the operating portion, the hook member is It is possible to cope with the rotation operation of the operation unit. Therefore, it becomes possible to smoothly remove the operation unit.

By the way, in the present invention, since the hook claw portion is movable, after removing the operation portion from the main body case side,
The hook member may move carelessly due to vibration or the like, and the hook claw portion may not engage with the groove portion when the operation portion is attached to the main body case. Therefore, in the invention of claim 3, the position of the hook member is regulated by the hook stopper. Therefore, the hook claws do not enter the inner side of the main body case, and the hook claws can be always engaged with the groove when the operation unit is attached to the main body case. As a result, the hook member can surely fulfill the function of preventing the operating portion from falling off.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. This embodiment is an example of a vehicle-mounted electronic device provided with the operation portion attaching / detaching mechanism of the present invention. 1 and 2 are plan views of the present embodiment, FIG. 3 is a sectional view taken along the line AA of FIG. 1, FIG. 4 is a sectional view taken along the line BB of FIG. 2, and FIG. 6 is a sectional view taken along the line CC of FIG. 5, and FIGS. 7 to 10 are a front view, a plan view, a right side view and a left side view of the hook member alone. The same members as those in the conventional example shown in FIGS. 11 to 18 are designated by the same reference numerals and the description thereof will be omitted.
Further, in the present embodiment, the same main constituent members of the operating portion attaching / detaching mechanism are adopted as those of the conventional example shown in FIGS. 11 to 14. In FIGS. 1 to 4, the main constituent members of the operating portion attaching / detaching mechanism are shown. Illustration is omitted.

(1) Configuration of Embodiment The configuration of this embodiment will be described below. A hook member 16 is provided near the left end of the recess 1a of the main body case 1 (on the lower side in FIGS. 1 and 2). A bottom portion 16a is formed on the hook member 16, and the bottom portion 16a is protruded here to support the spindle 1
6b and a hook stopper 19 are provided. Further, a rising portion 16c is formed on the bottom surface portion 16a of the hook member 16, and a hook claw portion 17 is formed on the upper portion of the rising portion 16c so as to extend toward the front side and have its tip protruding upward.

Such a hook member 16 is used for the main body case 1.
It is attached to the concave portion 1a so as to be rotatable around a support shaft 16b. More specifically, the fitting groove 21 and the holding portion 22 are provided on the bottom surface of the recess 1a. Of these, the support shaft 16b of the hook member 16 is rotatably fitted in the fitting groove 21 (shown in FIGS. 3 and 4), and the hook stopper 19 is configured to abut on the rear side edge. (Illustrated in FIG. 6). Further, the holding portion 22 is configured to sandwich the bottom surface portion 16a of the hook member 16 from above and below and to have a space for ensuring the sliding operation of the bottom surface portion 16a when the hook member 16 rotates. Further, the contact portion 20 is provided at the end of the portion of the holding portion 22 that presses the bottom portion 16a from above.
Is provided. The hook member 16 is provided on the contact portion 20.
The start-up portion 16c of the above is abutted from the back side.

On the other hand, a groove portion 18 extending in the thickness direction of the operating portion 2 is formed on the bottom surface portion of the back surface 2b of the operating portion 2. The hook claw portion 17 is slidably engaged with the groove portion 18.

(2) Operation and effect of the embodiment In the present embodiment having the above-mentioned structure, the operation portion 2
The operation of detaching from the recess 1a of the body case 1 and the storing operation will be described. First, the detaching operation of the operation unit 2 will be described.

That is, as in the conventional example, when the operating portion 2 is pushed out from the recess 1a of the main body case 1 by the pressing member 7, the front end of the groove portion 18 of the operating portion 2 is hooked by the hook claw portion 17.
Hit. At this time, the hook member 16 is pulled out to the operation portion 2 side and rotated counterclockwise around the support shaft 16b up to the maximum movable range, and the hook member 16 is attached to the contact portion on the main body case 1 side. The rising portion 16c abuts and stops.
In such a detaching operation of the operation portion 2, since the hook claw portion 17 is engaged with the groove portion 18 on the operation portion 2 side, even if the operation portion 2 is pushed out from the concave portion 1a of the main body case 1, the operation portion 2 is operated from here. It is possible to prevent the part 2 from falling off.

In addition, the operating portion 2 is formed in the concave portion 1a of the main body case 1.
In the case of mounting and storing the operation unit 2 on the right side surface of the operation unit 2, the recess 13 on the right side surface of the operation unit 2 is hooked on the projection 1b on the main body case 1 side, and the left side surface of the operation unit 2 is pressed and stored. At this time, the hook claw portion 17 naturally fits in the groove portion 18 of the operation portion 2, and the hook member 16 is placed on the rear surface portion 2c of the operation portion 2 front surface portion 2a.
While being pushed by, it rotates clockwise about the support shaft 16b and returns to the initial position. At that time, the position of the hook member 16 is regulated by the hook stopper 19 hitting the inner side edge of the fitting groove 21 on the main body case 1 side, and the hook claw portion 17 may enter the back side of the main body case 1. Absent. for that reason,
When attaching the operation part 2 to the main body case 1, the hook claw part 1
Since it is possible to always engage 7 with the groove portion 18, it is possible to enhance the reliability of the fall prevention performance.

Further, in this embodiment, since the hook member 16 is a member separate from the main body case 1, the hook claw portion 17 is not affected by thermal deformation of the main body case 1 side. Therefore,
It is possible to prevent a problem that the hook claw portion 17 is not deformed, the operation portion 2 cannot be removed from the main body case 1 side, and conversely, the operation portion 2 falls off from the main body case 1 side. According to the present embodiment as described above, the operation unit 2
It is possible to further improve the reliability of the falling prevention performance.

Further, in this embodiment, since the hook claw portion 17 also moves in the front-back direction as the hook member 16 rotates, the discharge amount of the operating portion 2 increases compared to the conventional example in which the claw portion is fixed. . Therefore, the operation of removing the operation unit 2 can be smoothly performed. Generally, increasing the discharge amount of the operating unit 2 causes mechanical complexity and size increase.
In the present embodiment, this is realized by a simple structure in which the hook member 16 is rotatably provided. That is, the number of members is mechanically simple by increasing the number of hook members 16 by one. Therefore, it is possible to reduce the manufacturing cost while realizing the increase in the discharge amount of the operation unit 2.

(3) Other Embodiments The present invention is not limited to the above embodiments,
The specific material, shape, and arrangement position of each member can be appropriately changed. For example, an embodiment in which the hook member is provided so as to be linearly movable in the front-back direction with respect to the main body case is also included. Further, the hook stopper for restricting the position of the hook member may be provided not on the hook member itself but on the main body case side. Further, even if the hook member is movably provided on the operation portion side and the groove portion that engages with the hook claw portion is provided on the main body case side, the same operational effect can be obtained.

[0039]

According to the operation portion attaching / detaching mechanism of the present invention as described above, the hook member having the hook claw portion is provided on the body case side so as to be movable in the front-rear direction, and the groove portion engageable with the hook claw portion is provided. Since the hook claw part is a separate member from the main body case side, the reliability of the operation part drop-out prevention performance is improved without being affected by thermal deformation, and the operation part is simple. The discharge amount of can be increased and the operating section can be removed smoothly.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention (when the operation unit is stored).

FIG. 2 is a plan view of the present embodiment (when the operation portion is removed).

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a plan view of an essential part of this embodiment.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a front view of a single hook member.

FIG. 8 is a plan view of a single hook member.

FIG. 9 is a right side view of a single hook member.

FIG. 10 is a left side view of the hook member alone.

FIG. 11 is a perspective view of a conventional operation unit attaching / detaching mechanism (when the operation unit is stored).

FIG. 12 is a perspective view of a conventional operating portion attaching / detaching mechanism (when the operating portion is removed).

FIG. 13 is a perspective view showing a positional relationship between a release button and a lock member in a conventional operation portion attaching / detaching mechanism.

FIG. 14 is a plan cross-sectional view of a conventional operating portion attaching / detaching mechanism.

FIG. 15 is a plan view (when the operation portion is housed) for explaining the operation portion falling prevention structure in the conventional operation portion attachment / detachment mechanism.

FIG. 16 is a plan view (at the time of removing the operation portion) for explaining the operation portion falling prevention structure in the conventional operation portion attachment / detachment mechanism.

17 is a cross-sectional view taken along line DD of FIG.

18 is a cross-sectional view taken along line EE of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body case 1a ... Case front surface 1b ... Convex part 1c ... Restriction port 1d ... Fixed end part 2 ... Operation part 2a ... Locked part 2b ... Protrusion 3 ... Lock member 4 ... Cover part 4a ... Hole 5 ... Release member 6 ... Lock member 6a ... Key portion 6b ... Inclined surface 6c ... Constricted portion 6d ... Movement end portion 7 ... Pressing member 8 ... Tension coil spring 9 ... Compression coil spring 10 ... Inner panel 11 ... Locked portion 12 ... Release member 12a ... Button portion 12b ... Inclined portion 13 ... Recessed portion 14, 18 ... Groove portion 15 ... Claw portion 16 ... Hook member 16a ... Bottom portion 16b ... Support shaft 16c ... Rise portion 17 ... Hook claw portion 18 ... Groove portion 19 ... Hook stopper 20 ... Abutment portion 21 ... Fitting groove 22 ... Holding part

Claims (3)

[Claims] 1. A main body case, an operation section which is attachable to and detachable from a front surface of the main body case, and a lock member which is provided on the main body case side and which performs a locking operation for engaging the operation section and a releasing operation for releasing the operation section. And a hook member movable in the front-back direction is provided on the main body case side, a hook claw portion is formed on the hook member, and a groove portion engageable with the hook claw portion is provided in the operation portion attaching / detaching mechanism. An operation section attaching / detaching mechanism characterized in that it is formed on the section side. 2. The operating portion attaching / detaching mechanism according to claim 1, wherein the hook member is provided rotatably with respect to the main body case so that the hook claw portion moves in the front-rear direction. 3. A hook stopper for restricting the position of the hook member so that the hook claw portion engages with the groove portion when the operation portion is attached to the main body case. Alternatively, the operation unit attaching / detaching mechanism described in 2.