JPH0217292Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an instrument having a box-type case for accommodating an instrument body including a counter-based count display section, etc., and particularly relates to the storage groove structure of the instrument body.

When the box-type case that houses the instrument body is made of synthetic resin, the inside surface of the case has a taper necessary for die cutting during the molding process, so the cross-sectional area of the bottom of the case and the opening end are different. This poses a problem in that the instrument body housed in the case shakes. To solve this problem, special positioning means have conventionally been provided on the case or the instrument body, but with this structure, storing the instrument body is complicated, and it is also time-consuming to remove it for maintenance and inspection. There was a problem.

In particular, when the instrument body housed in the case described above has a count display section, etc., and a reading window is formed on the front plate side that is attached so as to close the case opening end, these The main body of the instrument must be stored and held in the case with the leading line of the instrument positioned, and a reliable means of positioning between both parts is required, and the positioning and assembly work is troublesome and complicated. It was hot.

The present invention was developed in view of these circumstances, and it positions the lower end of the instrument body by providing a positioning means on the inner surface of the bottom of the case, and also positions the lower end of the instrument body and the opening end of the case. The upper end of the instrument body is positioned by an engaging means provided to position and connect it to the front plate to be locked, and the front plate prevents the instrument body from floating up. To provide an inexpensive meter that has a simple configuration, allows the work of storing the main body of the meter in a case to be performed easily and reliably, and is also easy to remove.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 shows an embodiment in which the meter according to the present invention is applied to a non-reset type hour meter. In the figure, reference numeral 1 denotes a box type box made entirely of synthetic resin and formed into a substantially rectangular tube shape with a bottom. In the case 1, a motor section 2, a gearbox section 4 having a reduction gear group 3, and a counter mechanism section 5 as a count display section are assembled in a laminated state in a stacked manner, forming a mechanism as an instrument body. unit 6
is stored. In addition, the opening end 1a of this case 1
A front plate 7, which is entirely formed into a substantially flat plate shape from a transparent synthetic resin material, is engaged and fixed in place.
A decorative board 8 having a display window 8a serving as a reading window for exposing the display value of the counter mechanism section 5 is attached onto the front panel 7.

Here, to briefly describe each member constituting the above-mentioned mechanical unit 6, first, the motor section 2
This is a well-known synchronous motor, which includes a stator case 10a having a substantially bottomed cylindrical shape, a stator lid 10b placed over the open end of the stator case 10a, a rotor, a coil bobbin around which coil windings are wound, and a coil case assembled around the outer periphery of the coil bobbin. etc. (both not shown) are stored. In addition. In the figure, 11 indicates terminals 12a and 12b for connecting both ends of the coil winding to an external power source.
This terminal mounting part 11 is integrally formed with the coil case. Moreover, 13 in the figure is an output gear provided on the output shaft of the rotor.

On the other hand, the gearbox section 4 stacked on top of the motor section 2 has a pair of upper and base plates 14 and 15, as is clear from FIGS. 2a and 2b.
The reduction gear group 3 is pivotally supported between the two base plates 14 and 15. The output gear 13 of the motor section 2 faces through a hole 15a formed in the center of the base plate 15, and transmits rotation to the reduction gear group 3.

In this case, the entire base plate 15 is integrally formed from a synthetic resin material, and three rod portions 16 are provided on the upper surface of the base plate 15 to maintain a distance from the upper base plate 14. Hole 14a of main plate 14
A fitting stepped portion 16a that fits into the fitting step portion 16a and a protrusion portion 16b that protrudes further upward are formed. Further, three elastic pieces 17 having claw portions 17a for removably assembling the motor portion 2 are provided upright on the lower surface of the base plate 15.
and the motor section 2 are assembled in a stacked state. In addition, 20 in the figure is a cycle switching lever rotatably supported at one corner of the base plate 14, and this rotational operation is transmitted to the switching cam 21 via a pin 20a, and one of the pair of cycle gears 22a and 22b is transmitted. constitutes a part of the reduction gear group 3. In this case, pin 20
By sliding a on the chevron-shaped cam 23 on the base plate 15, a click action is applied to the switching lever 20. Further, the upper and lower ends of this switching lever 20 extend in the axial direction, and are connected to the front plate 7.
hole 24 and hole 25 on the bottom plate side of the case 1.
(See Fig. 4) It is configured to be able to be switched from both directions.

Further, as is clear from FIGS. 3a and 3b, the counter mechanism section 5 has a counter frame 30 consisting of a bottom plate section 30a and a pair of side plate sections 30b and 30e that protrude above the bottom plate section 30a. 30b,3
Two shafts 31a, 31 supported between 0c
A six-digit number wheel 32 and five pinions 33 responsible for raising the numbers are rotatably supported on b. In this case, the lowest digit number car 3
2a is for displaying quantiles, and the bottom plate part 3
It is formed integrally with a worm wheel 35 that meshes with a worm 34a on a worm shaft 34 supported on the worm shaft 34. In the figure, 36 is an input gear provided at the lower end of the worm shaft 34 and meshes with the reduction gear group 3, and 37 is an indicator indicating the operating state of the counter.

The counter mechanism section 5 is removably attached in a stacked state by fitting the hole 38 formed in the frame bottom plate section 30a into the protrusion section 16b on the gearbox section 4 side. In this case, the upper end of the switching lever 20 mentioned above protrudes upward from a slightly large diameter hole 38a formed in the bottom plate portion 30a. In addition, in this assembled state, the input gear 36 on the wormshaft 34
Needless to say, it is assembled so that it faces downward from the opening 39 of the upper base plate 14 and meshes with the reduction gear group 3 to receive rotational transmission from the motor section 2.

Now, according to the present invention, the mechanical unit 6 as the instrument body assembled in the above-described manner has its lower end positioned at the bottom inner surface of the case 1, and its upper end positioned at the open end of the case 1. Engagement means (protrusions 43a, 43b and fitting holes 44, which will be described later) are provided to position and engage the front plate 7 and the front plate 7 which are engaged and assembled.
a, 44b) so that they are assembled in a positioned state, and are housed and held in the case 1 while being prevented from floating by the front plate 7. With this configuration, even if the inner peripheral surface of the case 1 is a tapered surface necessary for die cutting, the mechanical unit 6 can be stably housed and held within the case 1. In addition, the storage operation and the removal operation can be performed easily and reliably.

To explain this in detail, the housing part 1b of the case 1 is formed according to the external shape of the mechanical unit 6, and on the inner surface of the bottom thereof there is a positioning protrusion 4 for positioning and supporting the motor part 2, which is the lowest layer of the mechanical unit 6.
0 is provided, and a receiving portion 41 for supporting the motor portion 2 is provided protruding from the bottom surface. In addition, 42 in the figure
is an opening corresponding to the terminal attachment part 11 of the motor part 2. With this configuration, the lower end of the mechanical unit 6 is reliably positioned and supported by the positioning means on the inner surface of the bottom of the case 1.

On the other hand, a pair of protrusions 43a, 43b are protruded from the upper ends of both side plate parts 31b, 30c of the counter frame 30 corresponding to the upper end of the mechanical unit 6, and a fitting hole 44a is provided in the front plate 7 opposite to this. ,44
b is bored, which allows the mechanical unit 6
An engaging means is configured to combine and connect the front plate 7 and the front plate 7 in a positioning state. The front plate 7 is formed so as to fit into the opening end 1a of the case 1, and is attached to the case 1 while being positioned at the periphery of the opening 1a. Further, the length from the inner surface of the front plate 7 to the bottom of the case 1 is formed to match the height of the mechanical unit 6.

In addition, in the figure, 45a and 45b are locking projections on the front plate 7 side that are locked in notch grooves 46a and 46b formed in the open end 1a of the case 1, and 47 is a locking projection when a reset type counter mechanism is used. This is a drilled hole corresponding to a zero return push button, and is covered with a decorative plate 8 when a non-reset type is used. Furthermore, an elastic locking piece 48 is formed on the side of the case 1 for inserting and mounting the hour meter into a mounting hole on the main device side.

In this way, case 1 of mechanical unit 6
unit 6 by simply inserting it into the housing 1b of the unit 6.
The lower end of the case 1 is engaged with the positioning means on the inner surface of the bottom of the case 1 to be positioned. and,
In this inserted state, the front plate 7 is attached to the open end 1a of the case 1.
When the mechanical unit 6 is positioned and locked on the case 1 and the perforated holes 44a and 44b, which are the engaging means, are engaged with the protrusions 43a and 43b on the upper end of the mechanical unit 6, the mechanical unit 6 is The upper end of the case 1 is positioned within the case 1, and is prevented from floating up, thereby allowing it to be stably stored and held. This state is shown in FIGS. 5a and 5b.

The structure in which the mechanical unit 6 is housed and held using the front plate 7 as described above has the advantage that the positioning of the front plate 7 and the leading line, etc., which is most necessary in this type of time meter, can be performed at the same time. The same holds true for the positioning of the indicator 37 and the window 8b of the decorative panel 8, as well as the push button and the drilled hole 48 in the case of the reset type.

In the embodiment described above, the projections 43a, 43b and the fitting holes 44a, 44 are used as engagement means for positioning the upper end of the mechanical unit 6 and the inner surface of the front plate 7.
b. However, the present invention is not limited to this, and the reverse may be used, and it goes without saying that various other known positioning engagement means may be provided between the two members.

Furthermore, in the above-mentioned embodiment, the case where an hour meter was used as the meter was explained, but the present invention is not limited to this, and any meter that stores and holds the meter body using a box type case can be used. It goes without saying that any type of instrument may be used.

As explained above, according to the present invention, the instrument body housed in a box-type case is positioned between the upper end of the instrument body and the inner surface of the front plate that is engaged with the opening end of the case. In addition to positioning and retaining the instrument using the mating means, the front plate prevents it from lifting up, making it possible to securely store and maintain the instrument body within the case despite its simple and inexpensive structure. It is easy to store and remove, and the reading part of the meter body can be positioned with respect to the front plate at the same time when it is stored, so it has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment in which the instrument according to the present invention is applied to a non-reset type hour meter, Figs. 2 a and b are a plan view and a front view of the gearbox portion thereof, and Figs. 3 a and 3 are Similarly, FIG. 4 is a plan view and a side view of the counter mechanism, FIG. 4 is a plan view of the case, and FIG. 5 is a front view and a side sectional view of the assembled hour meter. DESCRIPTION OF SYMBOLS 1...Case, 1a...Opening end, 1b...Storage part, 6...Mechanical unit (instrument body), 7...Front plate, 40...Positioning protrusion, 43a, 43b...
...Protrusion, 44a, 44b...fitting hole.

Claims (1)

[Scope of utility model registration request] A meter body having a count display section on the upper end side, a case formed entirely of synthetic resin into a substantially bottomed cylindrical shape to house the meter body, and assembled to the open end of the case by a locking means. a front plate that is fixed and has a reading window for the counter display, and a positioning means is provided on the inner surface of the bottom of the case to engage and hold the lower end of the instrument body. Engagement means are provided at the upper end and the inner surface of the front plate for positioning and engaging and holding them at a position where the count display section at the upper end of the instrument body faces the reading window on the front plate side, and The instrument is characterized in that the front plate is assembled and fixed to the open end of the case to prevent the instrument body from floating up.