JP2008170372A - Hand-held type measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operability with simple structure, concerning the structure of a hand-held type measuring device. <P>SOLUTION: Assembling of a key top module 5 on an upper case 1 is performed by pivotally supporting a rocking shaft 55 by a bearing part 14 of the upper case 1, and by pressing and inserting two bosses 13 of the upper case 1 into two boss holes 53 of the key top module 5. In this case, in the state where the key top module 5 is assembled on the upper case 1 in this way, the upper surface of an operation key top 51 is arranged on a tapered part tilted downward toward the rear part of the upper case 1 approximately at the same height and approximately with the same inclination as the upper surface of the tapered part. The operation key top 51 rocks the rocking shaft 55 so that the rear part is moved downward as the rocking shaft 55 with a restoring force by an energizing force of a flexible part 54 corresponding to pushing-down operation by a user, and a projection 56 on an upper part for performing operation of a push switch is moved downward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the structure of a handheld measuring device.

As a hand-held measuring device, there is known a device in which various operation buttons of a hand-held measuring device and a display screen of a display device showing measurement results and the like are collectively arranged on the upper surface of the hand-held measuring device (for example, Patent Document 1).
JP 2006-214891 A

  According to the handheld measurement device described in Patent Document 1, since various operation buttons are provided in a form protruding from the upper surface of the handheld measurement device, when the handheld measurement device is carried in a pocket, In some cases, an unexpected button operation was performed. On the other hand, in order to suppress the occurrence of such an unintended button operation, if a hold switch configured so as not to be easily operated for prohibiting the acceptance of the operation is provided, the structure of the apparatus becomes complicated. At the same time, the operability at the start of use deteriorates.

  Moreover, since the handheld type measuring apparatus described in Patent Document 1 does not have a special structure for improving the grip performance when handheld, its operability is not always sufficient. Here, if a non-slip member or the like using an appropriate material is provided in a portion gripped by the user of the hand-held measuring device, the grip performance is improved, but this makes the device structure complicated. End up.

  Accordingly, an object of the present invention is to provide a hand-held type measuring apparatus that has good operability and simple structure.

  In order to achieve the above object, the present invention provides a handheld type measuring device that is operated in a hand-held manner in which a measurement function unit is accommodated in a substantially rectangular parallelepiped case, and a display surface is disposed on the upper surface of the case accommodated in the case. And the operation keys arranged on the upper surface of the case. However, the upper surface of the case is formed such that the height of the front part is higher than that of the rear part, and the front part and the rear part are connected between the front part and the rear part. And an inclined portion inclined downward toward the rear. The display surface is disposed in a front portion of the upper surface of the case, and the operation key is disposed on the inclined portion of the upper surface of the case, and the height and inclination of the upper surface of the operation key are the upper surface of the case. It arrange | positions so that it may align with the height and inclination of the said inclination part.

  According to such a hand-held type measuring apparatus, the operation key is arranged so that the upper surface thereof is aligned with the inclined portion of the upper surface of the case. Therefore, since the case of the operation key does not protrude, it is possible to prevent an unintended operation of the operation key top from being performed by any means when the measuring device is carried in a pocket or the like. In addition, since the operation key is provided on the inclined part that is inclined downward toward the rear of the case, the user grasps the rear part of the case and grasps it while looking at the display surface of the front part. The operation can be performed in a natural operation mode in which the operation key is pressed down to the surface of the rear portion.

Here, in such a handheld type measuring apparatus, the operation key is a switch housed in the case with the rear end swinging downward with the front end as a swinging shaft in response to a user's pressing operation. Providing it to operate is preferable for improving its operability.
When the second key disposed on the upper surface of the case is provided, the operation key and the second key may be integrally formed as a single key module. In this case, the key module includes a shaft portion provided at a front end of the operation key and extending in the left-right direction, a first flexible portion connected to a rear end of the operation key, and the first The fixed portion connected to the flexible portion, and the second flexible portion connected to the fixed portion and the second key, and the shaft portion is pivoted on the inner surface side of the upper wall of the case. A bearing portion to be worn and a fixing structure portion for fixing the fixing portion to the upper case may be provided.
By doing so, a plurality of keys can be configured easily and with a small number of parts.

  In order to achieve the above object, the present invention provides a pair of left and right handheld measuring devices each having a measuring function unit housed in a substantially rectangular parallelepiped case, which are secured to left and right side walls of the case. The grip member is included. However, the case is composed of an upper case that forms the upper part of the case and a lower case that forms the lower part of the case, and the left and right side walls of the upper case each have a plurality of rows arranged in the front-rear direction. A hole having a narrowed width in the front-rear direction is provided in the upper part, and a plurality of holes arranged in the front-rear direction are narrowed in the front-rear direction in the left and right side walls of the lower case. Is provided. A plurality of first arrays arranged in the front-rear direction are provided on the right side surface of the grip member fixed to the left side wall of the case, corresponding to each of the holes on the left side wall of the upper case. The upper part of the left side surface of the grip member that has a hook and is fixed to the right side wall of the case is provided corresponding to each of the holes in the right side wall of the upper case, and is arranged in the front-rear direction. A lower hook on the right side surface of the grip member that has a second hook and is fixed to the left side wall of the case is arranged in the front-rear direction provided corresponding to each hole in the left side wall of the lower case. A plurality of third hooks provided in the lower part of the left side surface of the grip member fixed to the right side wall of the case, corresponding to each of the holes in the right side wall of the lower case, And having a plurality of fourth hooks arranged in a row.

  In addition, a hook-shaped portion bent in the front-rear direction is formed at the tips of the first hook and the second hook, and the width in the front-rear direction of the hook-shaped portion of the first hook and the second hook is The lower portion of the corresponding hole is smaller than the width in the front-rear direction and larger than the width in the front-rear direction of the upper portion of the corresponding hole, and the hook-shaped portions of the first hook and the second hook are A hook-shaped portion bent in the front-rear direction is formed at the front and rear peripheral portions of the upper portion of the corresponding hole of the case, and the third hook and the fourth hook are bent in the front-rear direction. The hook-shaped portions of the hooks 3 and 4 have a front-rear width smaller than a front-rear width of an upper portion of the corresponding hole, larger than a front-rear width of a lower portion of the corresponding hole, and The hook-shaped portions of the third hook and the fourth hook are respectively formed on the lower case. It is what is hooked on the peripheral portion of the front and rear of the lower part of the response to the hole.

  According to such a measuring device, the grip member can be firmly and stably assembled to the left and right of the measuring device at a plurality of positions on both the upper and lower sides of the grip member with a simple structure, and the gripping property of the measuring device when handheld. Improvement can be realized. In addition, the grip member can also serve as a connection between the upper case and the lower case or as a cover for the joint, thereby simplifying the structure of the measuring apparatus. Furthermore, the hook-shaped portions of the first hook and the second hook of the grip member are inserted into the lower portions of the corresponding holes of the upper case, and the hook-shaped portions of the third hook and the fourth hook of the grip member are inserted. The upper case and the lower case are inserted into the upper portions of the corresponding holes of the lower case, and the upper case and the lower case are sandwiched by applying force from above and below, and the hook-shaped portions of the first hook and the second hook are respectively corresponding to the upper case. The hooks are hooked on the front and rear peripheral portions of the upper portion of the hole, and the hook-shaped portions of the third hook and the fourth hook are respectively hooked on the front and rear peripheral portions of the corresponding lower portion of the lower case. With this simple operation, the grip member can be securely assembled to the case.

  As described above, according to the present invention, it is possible to provide a handheld type measuring apparatus that has both good operability and simple structure.

Hereinafter, embodiments of the present invention will be described by taking application to a handheld optical tachometer as an example.
In FIG. 1, the external appearance of the tachometer which concerns on this embodiment is shown.
In the figure, a represents the front surface of the tachometer, b represents the top surface of the tachometer, c represents the rear surface of the tachometer, d represents the left side surface of the tachometer, e represents the right side surface of the tachometer, and f represents the bottom surface of the tachometer. In the figure, g represents the tachometer as seen from above.
As shown in the figure, on the upper surface of the tachometer, there are a measurement key top 51 as an operation part of a measurement switch, a command key top 52 as an operation part of two command switches, and a liquid crystal display device for displaying measurement results and the like. A display screen 61 and an indicator lamp 7 are provided. A throwing unit 8 is provided on the front surface of the tachometer for projecting light for rotation detection onto the object to be measured and for incident light reflected by the object to be measured.

  In the tachometer, functional units including a liquid crystal display device, an electric circuit board, and an optical system are accommodated, and these functional units perform the following operations. That is, when the measurement switch is pushed down by the user, the tachometer is turned on until a predetermined period elapses after the depression of the measurement switch is stopped. And while the measurement switch is pushed down by the user, light is generated and projected from the lens, and the number of rotations of the measured object is calculated according to the intensity change of the reflected light of the light incident on the lens, While displaying on the display screen 61 of a display apparatus, the presence or absence of the detection of reflected light is displayed by lighting of the indicator lamp 7. FIG. Further, when a command switch is operated during a period when the power is on, an operation corresponding to the operation content is performed.

Such a tachometer housing is composed of an upper case 1, a lower case 2, left and right grip members 3, and a battery lid 4.
FIG. 2 shows the structure of the upper case 1.
In the figure, a is the front surface of the upper case 1, b is the upper surface of the upper case 1, c is the rear surface of the upper case 1, d is the left side surface of the upper case 1, and e is the right side surface of the upper case 1. f represents the bottom surface of the upper case 1, and in the figure, g represents the upper case 1 as seen from above, and h represents the upper case 1 as seen from below.

As shown in the drawing, the upper case 1 has a generally box shape with the lower surface opened.
The upper wall of the upper case 1 has an opening for exposing the display screen 61 of the liquid crystal display device, the measurement key top 51, the two command key tops 52, and the indicator lamp 7 to the top surface of the tachometer. Here, the upper surface of the upper case 1 has a step shape in which the front portion is higher than the rear portion, and the step in the step shape is connected by a tapered portion having an inclination in which the rear portion is lower than the front portion. ing. An opening for exposing the display screen 61 of the liquid crystal display device and the indicator lamp 7 to the upper surface of the tachometer is provided in the front portion that is higher above, and the measurement key top 51 and two commands are provided in the tapered portion. An opening for exposing the key top 52 to the upper surface of the tachometer is provided.

  Further, the lower surface of the upper wall of the upper case 1 is provided with a projecting portion 11 having a female screw cut, two flanges 12, two bosses 13, and a bearing portion 14. Further, on the left and right side walls of the upper case 1, there are convex-shaped holes 15 which are convex-shaped holes, which are used for attaching the grip member 3 and whose width in the front-rear direction is narrowed at the top as shown in FIG. A plurality are provided.

Next, the structure of the lower case 2 is shown in FIG.
In the figure, a is the front surface of the lower case 2, b is the upper surface of the lower case 2, c is the rear surface of the lower case 2, d is the left side surface of the lower case 2, and e is the right side surface of the lower case 2. f represents the bottom surface of the lower case 2, and in the figure, g represents the lower case 2 as seen from above, and h represents the lower case 2 as seen from below.

As shown in the drawing, the lower case 2 has a generally box shape with an open upper surface.
The lower case 2 has a screw hole 21 through which a female screw provided on the protrusion 11 of the upper case 1 and a screw to be screwed pass. Further, on the upper surface of the lower wall of the lower case 2, there are provided two flange portions 22 that engage with two flange receivers 12 of the upper case 1. In addition, a concave shape portion 23 that accommodates a battery serving as a power source for the tachometer is formed on the lower surface of the lower case 2, and the battery lid 4 is attached so as to cover the concave shape portion 23.

Further, the left and right side walls of the upper case 1 are reverse convex holes, which are reverse convex holes that are used to attach the grip member 3 and have a narrow front and rear width as shown in FIG. A plurality of 24 are provided.
Next, the structure of the grip member 3 provided on the left and right side surfaces of the tachometer is shown. Here, since the grip member 3 provided on the left side of the tachometer and the grip member 3 provided on the right side have a bilaterally symmetric structure, here the grip member 3 provided on the right side is taken as a representative example. The structure of the member 3 is shown.

FIG. 4 shows the structure of the grip member 3 provided on the right side surface of the tachometer.
In the figure, a is the front surface of the grip member 3, b is the upper surface of the grip member 3, c is the rear surface of the grip member 3, d is the left side surface of the grip member 3, and e is the right side surface of the grip member 3. f represents the bottom surface of the grip member 3, and in the figure, g represents the grip member 3 as seen from the right, and h represents the grip member 3 as seen from the left.

As shown in the figure, the grip member 3 has a generally long plate shape and is made of an elastic material.
And the right surface of the grip member 3 has the shape provided with the uneven | corrugated shaped part 31 for slip prevention. In addition, a plurality of hooks 32 used for attaching the grip member 3 to the upper case 1 are arranged in the front-rear direction at the upper part of the left surface, and the hooks 32 used for attaching the grip member 3 to the upper case 1 are provided at the lower part of the left surface. A plurality of them are arranged in the front-rear direction.

Here, as shown in an enlarged view in FIG. 4J, each of the hooks 32 has a shape in which the tip is bent in a hook shape in the front-rear direction and the width in the front-rear direction is increased.
Now, the measurement key top 51 and the two command key tops 52 are integrally formed as a key top module 5 as shown in FIG.
In the figure, a is the front surface of the key top module 5, b is the top surface of the key top module 5, c is the rear surface of the key top module 5, d is the left side surface of the key top module 5, and e is the key top module 5. , F represents the bottom surface of the key top module 5, and in the figure, g is a perspective view of the key top module 5 from above, and h is a cross section of the key top module 5 taken along section line AA in FIG. Represents.

  As shown in the drawing, the key top module 5 is provided with two left and right boss holes 53, the left boss hole 53 and the rear left side of the measurement key top 51, the left boss hole 53 and the left command key top. The upper part of 52 is connected with the flexible part 54, respectively. Further, the right boss hole 53 and the right side of the measurement key top 51 are connected to the left side of the right part, and the right boss hole 53 and the upper part of the right command key top 52 are connected by a flexible part 54. In addition, a swing shaft 55 is provided at the front portion of the measurement key top 51.

Projections 56 are provided on the bottom surface of the measurement key top 51 and the bottom surface of the command key top 52 to push down the operation surface of each push switch used as a measurement switch or a command key switch.
Moreover, as shown in the cross section of FIG. H, the measurement key top 51 has a shape inclined downward from the front part toward the rear part.
Now, such a tachometer is assembled as follows.
First, assembling the key top module 5 shown in FIG. 5 to the upper case 1 shown in FIG. 2 is a cross-sectional view of FIG. As shown in FIG. 6 b, which shows a cross section taken along line BB, the swing shaft 55 of the key top module 5 is pivotally attached to the bearing portion 14 of the upper case 1, and the upper boss 1 is inserted into the two boss holes 53 of the key top module 5. This is done by press-fitting and inserting the two bosses 13.

  Here, in this state, the operation key top 51 and the two command key tops 52 of the key top module 5 each have a form in which the upper part is loosely fitted into the opening provided in the upper case 1 and the upper surface is exposed. Further, the flexible portion 54 between the operation key top 51 and the boss hole 53 bends according to the user's pressing operation of the operation key top 51 of the key top module 5, and the operation key top 51 is shown in FIG. 6c. As described above, while having a restoring force due to an urging force that resists the bending of the flexible portion 54, the swinging portion 55 is swung so that the rear portion moves downward with the swinging shaft 55 as a rotation shaft, and the protrusion 56 on the lower portion of the operation key top 51. Moves downward. Further, the flexible portion 54 between the command key top 52 and the boss hole 53 that has been pushed down bends in response to the user's push-down operation on the command key top 52, and the command key top 52 While having a restoring force due to an urging force that resists bending, the boss hole 53 is pivoted so that the rear part moves downward with the boss hole 53 as a fixed point, and the projection 56 below the command key top 52 moves downward.

  Here, in the state where the key top module 5 is assembled to the upper case 1 in this way, as shown in FIGS. 6B and 6C, the upper surface of the operation key top 51 is a tapered portion in which the rear portion of the upper case 1 is inclined downward. They are arranged at substantially the same height as the top surface and with substantially the same inclination. Therefore, when the tachometer is carried in a pocket or the like, an unintended operation of the operation key top 51 with some momentum is suppressed. Further, since the push-down key tops are provided at the tapered portion inclined downward toward the rear of the upper case 1, the user holds the tachometer while holding the rear portion of the tachometer. Each key top can be operated in a natural motion mode in which each key top is pressed down to the surface of the rear portion.

Next, the upper case 1, the lower case 2, and the two grip members 3 are assembled as follows.
That is, first, as shown in FIGS. 7a1-b1, the left side wall of the lower case 2 on which the liquid crystal display device 6, the circuit board 9 on which the push switch 81 used as a measurement switch, the push switch 82 used as a command switch, and the like are mounted. Each of the lower hooks 32 of the left grip member 3 is inserted into each of the reverse convex shaped holes 24, and the right grip member 3 is inserted into each of the reverse convex shaped holes 24 of the right side wall of the lower case 2. Each of the lower hooks 32 is inserted.

Here, in this state, the lower hook 32 of each grip member 3 is inserted into the wide portion in the front-rear direction width of the upper part of the inverted convex hole 24 on the side wall of the lower case 2 as shown in FIG. 7b2. It becomes a state.
Next, the upper case 1 assembled with the key top module 5 shown in FIG. 7c1 is arranged in parallel above the lower case 2 as shown in FIG. 7c2, and the convex hole 15 on the left side wall of the upper case 1 is formed. Each of the upper hooks 32 of the left grip member 3 is inserted, and each of the upper hooks 32 of the right grip member 3 is inserted into each of the convex holes 15 of the right wall of the upper case 1. .

  Here, in this state, as shown in FIG. 7c3 which is an enlarged view of the hook 32 part in FIG. 7c2 and FIG. 7c2, the hook 32 on the lower side of each grip member 3 is an inverted convex character on the side wall of the lower case 2. The hook 32 on the upper side of each grip member 3 is inserted into the wide portion of the upper portion of the shape hole 24 in the front-rear direction width, and the lower portion of the convex shape hole 15 on the side wall of the upper case 1 is wide. Is inserted.

  Then, next, as shown by an arrow in FIG. 7d1, the upper case 1 and the lower case 2 are sandwiched by applying force from above and below, and shown in FIG. 7d3 which is an enlarged view of the hook 32 portion in FIGS. 7d2 and 7d2. As described above, a portion having a narrow width in the front-rear direction of the base of the hook 32 on the lower side of each grip member 3 is pushed into a portion having a narrow front-rear width in the lower portion of the inverted convex hole 24 on the side wall of the lower case 2. A portion having a narrow width in the front-rear direction of the base of the upper hook 32 of the member 3 is pushed into a portion having a narrow width in the front-rear direction at the upper portion of the convex hole 15 on the side wall of the upper case 1. In addition, at this time, the flange portion 22 provided at the front portion of the lower case 2 is fitted into the flange portion 12 at the front portion of the upper case 1.

  Here, in this state, as shown in the relationship between the hook 32 and the upper case 1 / lower case 2 viewed from the vertical direction in FIG. A shape in which the side wall of the upper case 1 / the lower case 2 is sandwiched between the long plate-shaped portion of the grip member and the hook-shaped portion at the tip of the hook 32 by stopping on the periphery of the shape hole 15 / reverse convex shape hole 24 It becomes. In this form, each grip member 3 connects the lower case 2 and the upper case 1, and each grip member 3 is fixed to the lower case 2 and the upper case 1.

Finally, the male screw is screwed onto the female screw of the protrusion 11 of the upper case 1 from below the lower case 2 through the screw hole 21 of the lower case 2 to complete the assembly.
Here, according to the grip member 3 assembled to the upper case 1 and the lower case 2 in this manner, the connecting member between the upper case 1 and the lower case 2 and the role as a cover of the joint between the upper case 1 and the lower case 2 The grip member 3 can be firmly assembled to the tachometer with a simple structure that also serves as an improvement in grip performance when handheld.

The embodiment of the present invention has been described above.
Note that the structure of the grip member 3 and key module of the tachometer and the shape and arrangement relationship of each key and case shown in the present embodiment can be similarly applied to any handheld type measuring device other than the tachometer. .

It is a figure which shows the external appearance of the handheld tachometer which concerns on embodiment of this invention. It is a figure which shows the structure of the upper case of the handheld tachometer which concerns on embodiment of this invention. It is a figure which shows the structure of the lower case of the handheld tachometer which concerns on embodiment of this invention. It is a figure which shows the structure of the grip member of the handheld tachometer which concerns on embodiment of this invention. It is a figure which shows the structure of the key top module of the handheld tachometer which concerns on embodiment of this invention. It is a figure which shows the assembly | attachment structure to the upper case of the key top module of the handheld tachometer which concerns on embodiment of this invention. It is a figure which shows the assembly | attachment structure of the upper case of the handheld tachometer which concerns on embodiment of this invention, a lower case, and a grip member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Upper case, 2 ... Lower case, 3 ... Grip member, 4 ... Battery cover, 5 ... Key top module, 6 ... Liquid crystal display device, 7 ... Indicator lamp, 8 ... Throwing part, 11 ... Projection part, 12 ...鈎, 13 ... boss, 14 ... bearing part, 15 ... convex hole, 21 ... screw hole, 22 ... collar part, 23 ... concave part, 24 ... reverse convex part hole, 31 ... convex and concave part, 32 ... Hook, 51... Measurement key top, 52. Command key top, 53. Boss hole, 54. Flexible portion, 55.

Claims (4)

A hand-held type measuring device that is housed and operated, which contains a measuring function unit in a roughly rectangular parallelepiped case,
A display device housed in the case and having a display surface disposed on an upper surface of the case;
An operation key disposed on the upper surface of the case;
The upper surface of the case is formed such that the height of the front part is higher than that of the rear part, and the front part and the rear part are connected between the front part and the rear part. Having an inclined portion inclined downward toward
The display surface is disposed in a front portion of the upper surface of the case;
The operation key is arranged on the inclined portion of the upper surface of the case so that the height and inclination of the upper surface of the operation key are aligned with the height and inclination of the inclined portion of the upper surface of the case. A hand-held measuring device.
A handheld measuring device according to claim 1,
The operation key is provided so as to operate a switch housed in the case by swinging a rear end downward with a front end as a swing shaft in response to a user's push-down operation. Handheld measuring device.
The measuring device according to claim 2,
A second key disposed on the upper surface of the case;
The operation key and the second key are integrally formed as a single key module,
The key module includes a shaft portion extending in a left-right direction provided at a front end of the operation key, a first flexible portion connected to a rear end of the operation key, and a fixed connected to the first flexible portion. And a second flexible portion connected to the fixed portion and the second key,
On the inner surface side of the upper wall of the case, there are provided a bearing portion for pivotally attaching the shaft portion, and a fixing structure portion for fixing the fixing portion to the upper case. measuring device.
A hand-held type measuring device that is housed and operated, which contains a measuring function unit in a roughly rectangular parallelepiped case,
A pair of left and right grip members fixed respectively to the left and right side walls of the case;
The case is composed of an upper case that forms the upper part of the case, and a lower case that forms the lower part of the case,
The left and right side walls of the upper case are each provided with a plurality of holes arranged in the front-rear direction and having a narrowed width in the front-rear direction in the upper part,
The left and right side walls of the lower case are each provided with a plurality of holes arranged in the front-rear direction, the width of the lower part being narrowed in the front-rear direction,
A plurality of first hooks arranged in the front-rear direction provided corresponding to each of the holes in the left side wall of the upper case are provided on the upper side of the right side surface of the grip member fixed to the left side wall of the case. And a plurality of second arrays arranged in the front-rear direction provided corresponding to each of the holes in the right side wall of the upper case at the upper part of the left side surface of the grip member fixed to the right side wall of the case. A plurality of a plurality of hooks arranged in the front-rear direction at the lower part of the right side surface of the grip member fixed to the left side wall of the case, corresponding to each of the holes in the left side wall of the lower case. The grip member is fixed to the right side wall of the case, and is arranged in the front-rear direction at the lower portion of the left side surface of the grip member corresponding to each of the holes on the right side wall of the lower case. A plurality of fourth hooks,
A hook-shaped portion bent in the front-rear direction is formed at the tips of the first hook and the second hook, and the width in the front-rear direction of the hook-shaped portion of the first hook and the second hook corresponds to each other. Smaller than the width in the front-rear direction of the lower portion of the corresponding hole, larger than the width in the front-rear direction of the upper portion of the corresponding hole, and the hook-shaped portions of the first hook and the second hook are respectively formed on the upper case. It is hung on the front and rear peripheral parts of the upper part of the corresponding hole,
A hook-shaped part bent in the front-rear direction is formed at the tips of the third hook and the fourth hook, and the width in the front-rear direction of the hook-shaped part of the third hook and the fourth hook corresponds to each other. Smaller than the width in the front-rear direction of the upper portion of the corresponding hole, larger than the width in the front-rear direction of the lower portion of the corresponding hole, and the hook-shaped portions of the third hook and the fourth hook are respectively formed on the lower case. A hand-held type measuring device, which is hooked on the front and rear peripheral portions of the lower portion of the corresponding hole.