JPH02649Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an instrument having a display section and a setting operation section on the surface of a front mask, and particularly relates to an instrument in which the front mask and its attached electronic circuit section can be pulled out as necessary.

A front mask with a display and setting operation section is exposed on the panel surface, an attached electronic circuit section is installed on the rear chassis, and this chassis section is inserted into the case for instrumentation. For items such as variable resistors and switches that need to be adjusted after instrumentation, the structure must be such that the chassis part housed in the case can be pulled out halfway. In this case, it is necessary for safety that the pulled-out chassis be reliably stopped at a certain position where internal operations are possible and locked at that position. Furthermore, since it may be necessary to remove the entire chassis for repair or maintenance purposes, it is desirable that the lock at this intermediate position can be released without complicated operations.

The object of this invention is to provide an instrument with a simple structure that can satisfy the above requirements.

Next, an embodiment of this invention will be described with reference to the drawings. 1 and 2, reference numeral 1 indicates a front mask, 2 a case, 3 a rear cover, 4 an upper frame, and 5 a lower frame, each of which is constructed by integrally molding a suitable plastic. ing. Further, numeral 6 indicates a printed wiring board, on which an electronic circuit section (not shown) is provided.

As shown in detail in FIGS. 3 and 4, the front mask 1 is a plate-shaped member to which any parts such as a display printed board, key switch, key cover, filter, etc. can be attached from the front side.
Upper frame 4 and lower frame 5 on its back
(Only the lower frame 5 is shown in FIGS. 3 and 4) is removably attached. That is, a pair of standing parts 5-1 facing each other are formed at the front end of the lower frame 5, and a hook 5-2 is provided on the front surface of the upper end of each standing part 5-1. 2 enters into the locking hole 1-1 formed on the back surface of the front mask 1, and is further slid downward relative to the front mask 1 to be engaged so that it will not come off. Further, a pair of mask connecting claws 5-3 are provided protruding from the front surface of the lower frame 5, and each mask connecting claw 5-3 is engaged with a locking claw 1-2 provided on the front mask 1. As a result, the lower frame 5 is attached to the front mask 1.
It will be firmly connected at four points. The structure of the upper frame 4 facing the lower frame 5 is as follows, except for the engaging part with the case 2, which will be described later.
Since it is the same as the lower frame 5, corresponding parts will be indicated by the same suffixes and symbols, and their explanation will be omitted. When attached to a predetermined position on the front mask 1, the upper frame 4 and the lower frame 5 face each other at a predetermined interval, and are engaged with grooves 4-4 and 5-4 provided in each. It is designed to support the printed wiring board 6.
The movable side structure is constructed by inserting the printed board 6 into a predetermined position and then attaching the rear cover 3. By inserting this into the case 2 from the front, the state shown in FIGS. 1 and 2 is formed. become.

Furthermore, a lock lever 5-5 is formed at the front end of the lower frame 5, and the tip thereof can be deflected in the vertical direction with appropriate elasticity. 2 into the engagement hole 2-1 of the case 2.
, and prevents the structure from being pulled out from the case 2. However, when the front end of the lock lever 5-1 is pushed up, the lock pawl 5-6 also rises and disengages from the engagement hole 2-1, allowing the structure to be pulled out from the case 2. Further, floating prevention claws 5-7 extending outward are formed on both sides of the rear end of the lower frame 5, and each slides into contact with the lower surface of the guide ribs 2-2 formed on both sides of the case 2. This prevents the rear end from lifting up during the process of the structure being pulled out from the case 2.

On the other hand, a pair of stop levers 5-8 are provided at the rear end of the lower frame 5, located on both sides thereof. This stop lever 5-8 is a plate-shaped member that extends rearward in parallel with the moving direction of the structure, and a claw 5-9 formed at its free end moves horizontally and vertically within a predetermined range. It has appropriate elasticity. And this nail 5
-9, as is clear from FIG. A vertical surface 5-9b that descends and a rear inclined surface 5-9c that slopes sequentially upward toward the rear from the lower end of the vertical surface 5-9b are formed.

In addition, in order to regulate the position of the claws 5-9 of each stop lever 5-8, the bottom of the case 2 has a stop hole 2-3, a stopper guide 2-4, and an escape hole, as shown in FIGS. 2-5 is formed, and a lock release pawl 2-6 is formed in the stop hole 2-3.
stands out. Each stopper guide 2-4 forms a protrusion that stands up from the bottom surface of the case 2 so as to extend in a direction substantially parallel to the moving direction of the structure, and its front end is connected to the stop hole 2-3, and its rear end is connected to the escape hole. 2
-5 respectively. The stopper guide 2-4 has a forward-slanting guide surface 2-4a which is located inside the rear end and has a forward-slanting guide surface 2-4a that becomes higher as it goes rearward, and an outwardly-inclined guide surface that gradually becomes higher as it goes forward from the rear end. A guide surface 2-4b is formed.

When the structure is housed in a predetermined position within the case 2, the pawl 5-9 is located within the escape hole 2-5, and the stop lever 5-8 is therefore in a free state. When the structure is pulled out from the case 2, the claw 5-9 also moves forward, and first the forward inclined surface 5-9a comes into sliding contact with the upper edge of the outward guide surface 2-4b of the stopper guide 2-4. At the same time, the stop lever 5-8 is elastically deformed so that its free end rises, thereby causing the pawl 5-9 to separate upward from the escape hole 2-5. When the pawl 5-9 moves further forward from this state, the pawl 5-9 moves toward the outer guide surface 2-4.
b, moves to the outside of the stopper guide 2-4, contacts the outer surface of the stopper guide 2-4, and presses the stopper
Move forward until you reach -3. and stop hole 2
-3 position, the pawl 5-9 moves to the stop hole 2.
-3, and further advancement is blocked at the position where the vertical surface 5-9b abuts the front edge of the stop hole 2-3, and the structure cannot be pulled out any further in this state. The lock release claw 2-6 is
The rear surface is the inclined surface 2-6a, and the front surface is the vertical surface 2-6b.
, so that the pawl 5-9 is connected to the stop hole 2-
3, the pawl 5-9 is simply pushed further outward against the restoring force of the stop lever 5-8, allowing it to pass by the side of the lock release pawl 2-6. This state makes the structure case 2
It can be pulled out halfway, making adjustments and other operations easier.

The vertical surface 5-9b of the claw 5-9 is the stop hole 2-3.
When the structure is pushed in slightly from the state in which it is in contact with the front edge, the pawl 5-9 retreats and moves back to the inclined surface 5-9.
It comes into contact with the vertical surface 2-6b of the lock release claw 2-6 at 9c, and is then pushed up. and nails 5-9
When the tip of the lock rests on the lock release claw 2-6,
The pawl 5-9 is moved inward by the restoring force of the stop lever 5-8.

When the claw 5-9 is on top of the unlocking claw 2-6, the structure cannot be pushed back to its original position.
Alternatively, it can be completely removed from case 2. That is, when the structure is pushed in, the claws 5-9 move inside the stopper guide 2-4 while sliding on the bottom surface of the case 2, and then move up along the forward tilting guide surface 2-4a, and then move toward the stopper guide 2.
-4 and then escape hole 2 from the rear end.
-5 and returns to the state before withdrawal.
Conversely, when pulling out the structure, the claws 5-9
slides on the inner surface of the case 2 without any restrictions, so the structure can be removed from the case 2. The movement path of the claw 5-9 by the above operation is the fifth
Shown in the figure with imaginary lines.

In the above embodiment, in the process of pulling out the structure, the claws 5-9 touch the outside of the stopper guide 2-4.
Furthermore, although a case is shown in which the stopper guides 2-4 are configured to pass through the inside during the pushing process, the arrangement of the left and right stopper guides 2-4 may be reversed so that they pass through the inside during the pulling process and the outside during the pushing process. Alternatively, if the structure is relatively small, one of the two sets of stop levers 5-8 and stopper guides 2-4 may be omitted. Further, if the lower frame 5 alone can support the electronic circuit section such as the printed wiring board 6, the upper frame 4 may be omitted.

As described above, according to this invention, when the structure is pulled out from the case to a halfway position for the purpose of adjusting the internal mechanism, it is possible to lock the structure so that it cannot be pulled out any further, and it is also possible to lock the structure so that it cannot be pulled out any further. After releasing the lock by simply pushing in the structure slightly and pulling it out again,
It is possible to push the structure back into place or to withdraw it completely. Therefore, operations such as adjustment, repair, and maintenance become easier and safety is improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of measurement according to an embodiment of this invention, Fig. 2 is a partially cutaway sectional view taken along line A-A in Fig. 1, and Fig. 3 shows a part of the front mask and lower frame. 4 is a perspective view of the front mask and lower frame seen from below, 5 is a perspective view showing part of the case, and 6 is an exploded perspective view.
The figure is a cross-sectional plan view thereof. 1...Front mask, 2...Case, 2-1
...Engagement hole, 2-2...Guide rib, 2-3...
Stop hole, 2-4...Stopper guide, 2-4
a...Forward tilting guide surface, 2-4b...Outward guide surface, 2
-5...Escape hole, 2-6...Lock release claw, 2-
6a... Inclined surface, 2-6b... Vertical surface, 3... Rear cover, 4... Upper frame, 5... Lower frame, 5-1... Standing part, 5-4... Groove, 5-5
... Lock lever, 5-6 ... Lock claw, 5-7
...Floating prevention claw, 5-8...Stop lever,
5-9...Claw, 5-9a...Anteriorly inclined surface, 5-9a...
...Vertical surface, 5-9c...Backwards inclined surface, 6...Printed wiring board.

Claims (1)

[Scope of utility model registration request] The frame includes a front mask and a frame that are connected to each other, and a case that removably houses the frame. The case has a stop lever that can be elastically deformed to move in a direction parallel to the bottom surface, and the case also includes a stopper guide that regulates the position of the claw while the frame moves within a predetermined range with respect to the case. , an escape hole for receiving the claw when the frame is inserted into the case to a predetermined storage position, and a relief hole for receiving the claw when the frame is pulled out to a predetermined position with respect to the case and placed in an intermediate position. The stopper guide has a stop hole that engages with the front edge of the pawl, and the stopper guide has a forward-slanted guide surface that guides the pawl into the relief hole during the movement of the case from the intermediate position to the storage position. , a guide surface for guiding the pawl into the stop hole in the process of the pawl moving forward from the relief hole; and a guide surface for guiding the pawl into the stop hole; An instrument characterized in that it is provided with a lock release claw for disengaging the claw from the stop hole when the instrument is moved slightly rearward.