JPH0519982Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention consists of a rod-shaped lock member, a guide groove provided in a first casing for guiding the axial movement of this lock member, and a lock member. a fitting hole provided in the second housing to be engaged with one end of the locking member protruding from an opening disposed at one end of the guide groove when the locking member is moved in the axial direction; Regarding the locking mechanism for locking the first casing and the second casing, it is suitable for application to, for example, a device for coupling and fixing the radio cassette body and the speaker box in a separate three-piece radio cassette. It is something.

[Summary of the idea]

The present invention is designed to prevent the lock member from escaping from the housing when the lock member, which is the sliding member of the lock mechanism, is molded from synthetic resin in a lock mechanism for a device that connects and fixes two housings. Claws of,
The housing of the lock member is formed by integrally molding the protrusion formed at the tip of the claw and for holding the lock member, and the beam portion for elastically supporting the claw, with the lock member main body. This eliminates the need for any parts for integration into the body, reducing assembly man-hours and costs.

[Conventional technology]

For example, as shown in Figure 1, a three-piece radio cassette whose speakers can be separated from the main body consists of a radio cassette main body (hereinafter simply referred to as the main body) 1, and a pair of left and right speaker boxes (hereinafter simply referred to as the speakers). 2).

These main body 1 and speaker 2 are connected to the second
As shown in the figure, they are engaged with each other by a pair of protruding pieces 3 and 4, respectively, and are coupled to be slidable up and down.

Therefore, in order to connect the speaker 2 to the main body 1, insert the speaker 2 into the main body 1 from above and insert the protruding piece 3 into the main body 1.
and 4 are engaged with each other, and then the locking member 5 as shown in FIG. It is inserted.

By the way, as shown in FIGS. 3 and 4, the conventional locking member 5 has a click protrusion 8 on the side sliding surface and a long hole 9 passing through in the longitudinal direction. Then, the elongated hole 9 is inserted into the protrusion 10 of the speaker 2 from above, and the lock member 5 is fitted into the guide groove 11.

Next, hold down plate 1 whose size is larger than the width of long hole 9.
2 is fixed to the protrusion 10 with a screw 13 to prevent the lock member 5 from coming off in the upward and sliding direction in FIG.

Then, when the locking member 5 is slid in the direction of arrow a or b, the protrusion 8 moves into the recess 14a or 1 of the guide groove 11.
4b, this causes a click feeling and the lock member 5 is stopped at this click position, thereby attaching and detaching the lock member 5 to the main body 1.

[The problem that the idea aims to solve]

However, in the conventional method described above, the locking member 5
The mounting requires a holding plate 12 and screws 13, which are separate parts, and also requires screwing in the screws 13, which is one of the causes of high costs.

In view of the above points, this invention reduces the number of parts and
The present invention provides a locking mechanism that enables a significant reduction in cost by reducing assembly man-hours.

[Means to solve the problem]

The present invention includes a rod-shaped lock member, a guide groove provided in the first casing for guiding the axial movement of the lock member, and a guide groove provided at one end of the guide groove for guiding the axial movement of the lock member. and a fitting hole provided in the second housing to be engaged with one end of the locking member protruding from the opening of the locking member, and the first housing and the second housing are connected to each other. In the locking mechanism, the locking member made of synthetic resin is integrally provided with a knob having a narrower width than the locking member and a pawl held through a beam having low bending rigidity, and the guide groove a slot extending from the opening along the axial direction of the guide groove and slidingly contacting the knob to guide the knob; a recess into which the pawl of the locking member is loosely fitted; In order to lock the member, a small recess is formed on the bottom surface of the recess and is fitted with the arcuate tip of the pawl, and the locking member is inserted from the other end into the opening of the guide groove. When the lock member is assembled into the first casing, the knob of the lock member is guided into the slot, and the pawl of the lock member is brought into sliding contact with the guide groove by the deflection of the beam. After the lock member is retracted and assembled into the first housing, the claw protrudes due to the elasticity of the beam portion and is fitted into the recess of the guide groove, thereby causing the lock member to be assembled into the first housing. The locking mechanism was configured to prevent the device from escaping from the casing.

〔Example〕

An embodiment in which the present invention is applied to a three-piece radio cassette will be described below with reference to FIGS. 1, 2, and 5 to 7. 1 and 2, the explanation thereof will be omitted since the same as already described in the "Prior Art" section can be obtained by simply replacing the reference numeral 31 for the locking member 5.

As shown in FIGS. 5 to 7, the lock member 31
is a nearly rectangular rod-shaped body, and is an integrally molded product made of synthetic resin. The central portion 20 of the main body is relatively thin, and upper and lower rims 17, 18 are disposed to surround the central portion 20, thereby supplementing the bending rigidity of the main body in the vertical direction.

Of the central portion 20, elongated holes 19a and 19b are provided on both sides of the protruding portion of the claw 32, which will be described later.
18 is insulated. Therefore, the central portion 20 sandwiched between the elongated holes 19a and 19b is
The beam portion has vertical bending rigidity set to a desired low value.

Next, the pawl 32 that protrudes downward from the locking member 31 has a right-angled surface 32a that is substantially orthogonal to the sliding direction of the locking mechanism 31, and a tapered surface 32 that forms an inclined surface.
b, and an arcuate surface 32C connecting these two surfaces. Note that from the central portion 20, a locking member 31 is inserted.
A narrower knob 6 projects upward.

Next, on the upper edge of the side wall of the guide groove 25 in which the locking member 31 is accommodated and slides therein, there is a pair of holes extending horizontally from the upper end so as to cover the upper part of the guide groove 25, as shown in FIG. Projecting pieces 26a, 26b are provided to protrude, and between the pair of projecting pieces 26a, 26b, the space extends from an opening provided at one end of the guide groove 25 along the axial direction of the guide groove 25. A slot for slidingly contacting the knob 6 and guiding the knob 6 is formed.

Next, as shown in FIG. 7, a recess into which the pawl 32 is loosely fitted is provided at the bottom of the guide groove 25, and the bottom surface of the recess is such that the bottom surface 35 of the recess is sandwiched in the center. A pair of small recesses 33, 3
4 are provided.

The cross-sectional shape of these small recesses 33 and 34 is similar to that of the claw 3.
When the claw 32 fits into one of these small recesses 33 and 34, the locking member 31 is fixed in that position. Furthermore, when a force is applied to the locking member 31 in the direction of arrow a or b in FIG. 6, the claw 32 easily escapes from one of the small recesses because the bottom surface 35 of the recess is much lower than the bottom surface of the guide groove. , fits into the other small recess.

When assembling the locking member 31 configured as described above into the speaker (first housing) 2, first insert the rear end of the locking member 31 (on the side where the claw 32 is provided) into the opening of the guide groove 25. (end) from the direction of arrow b shown in FIG. As the insertion progresses, the knob 6 of the locking member 31 is guided by the slot and moves.

Further, the claw 32 has a tapered surface 32b that is connected to the guide groove 2.
When the claw 32 contacts the opening of the locking member 31, it is pushed upward, and the displacement of the claw 32 caused by this pushing up is absorbed by the deflection of the beam 20 of the locking member 31. Therefore, the tip of the claw 32 comes into sliding contact with the bottom surface of the guide groove 25, and does not interfere with the above-mentioned insertion operation of the locking member 31.

When the tip of the pawl 32 reaches the edge of the recess provided in the bottom of the guide groove 25, the pawl 32 protrudes due to the elasticity of the beam 20 and is loosely fitted into the recess, as shown in FIG. Ru. In this case, the claw 32
Since the tip of the button fits into the small recess 33, a click feeling can be obtained.

Then, when the lock member 31 is pushed deeper,
The tip of the claw 32 comes out of the small recess 33, slides on the bottom surface 35 of the recess, and then fits into the small recess 34. At this point, you will feel a click again, and the locking member 3
1 to the speaker 2 is completed with this operation. That is, the locking member 31 occupies the position indicated by the dashed line in FIG. At this time, even if the locking member 31 is pushed further, the rear end surface will not touch the guide groove 25.
Since it comes into contact with a stopper 29 provided on the rear wall of the housing, further movement is impossible.

Next, the operation of the lock member 31 constructed as described above will be explained. When the lock member 31 is grasped by the knob 6 and pulled in the direction of arrow a from the position shown by the dashed line in FIG.
After removing the small recess 3 and sliding on the bottom surface 35 of the recess,
Inserted into 3. Thus, the front end of the locking member 31 (the end on the side where the knob 6 is provided) protruding from the opening of the guide groove 25 is fitted into the fitting hole 7 of the mating body 1, as described above. The speaker 2 and the main body are thus locked.

In this case, since the pawl 32 is engaged with the small recess 33, the locking member 31 can move freely, so that the lock will not be released unexpectedly. Further, even if an attempt is made to move the locking member 31 further in the direction of arrow a, the right-angled surface 32a of the claw 32 comes into contact with the substantially perpendicular edge of the recess, so that the locking member 31
There is no possibility that the guide groove 25 will move in the direction of arrow a and come out of the guide groove 25.

Next, when the lock member 31 is pushed in the direction of arrow b in FIG. 7 from this state, the pawl 32 slips out of the small recess 33 and engages with the adjacent small recess 34. At this time, a click feeling is obtained, and the locking member 31 is held in place at this position, as in the case of movement in the direction of the arrow a.

[Effect of idea]

Since the present invention has the above-described structure, unlike conventional locking mechanisms, no separate parts are required for assembling the locking member into the first casing. Therefore, assembly man-hours and costs are reduced.

Furthermore, in the case of the present invention, the protrusion for securing the locking member is provided at the tip of the claw that prevents the locking member from slipping out. There is no need to provide it separately. Further, it is also possible to elastically support the protrusion and the pawl with one beam. Therefore, the shape of the lock member is simplified, and the range of bending rigidity of the beam portion can be selected from a wider range from the viewpoint of the structure of the lock member, which is advantageous in terms of design.

[Brief explanation of the drawing]

Fig. 1 is a front view of a three-piece type radio cassette, Fig. 2 is an enlarged partial sectional view taken along the - arrow in Fig. 1, Fig. 3 and Fig. 4 show a conventional example, and Fig. 3 shows the main body side. FIG. 4 is a cross-sectional view taken along the - line in FIG. 3 with the exception of FIG. 5 to 7 show an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the - line in FIG. 6, and FIG. 6 is a sectional view of FIG. 2 excluding the main body side. −
A sectional view taken along the line (corresponding to Fig. 3), Fig. 7 is a sectional view of Fig. 6
FIG. 4 is a sectional view taken along the line - in the figure (corresponding to FIG. 4). In addition, in the symbols used in the drawings, 1...
Radio cassette main body (second housing), 2...Speaker box (first housing), 6...Knob, 7
... Fitting hole, 25 ... Guide groove, 31 ... Lock member, 32 ... Claw, 33, 34 ... Small recess.

Claims (1)

[Claims for Utility Model Registration] Rod-shaped lock member 31 and this lock member 31
a guide groove 25 provided in the first housing 2 to guide the axial movement of the lock member 31; A locking mechanism comprising a fitting hole 7 provided in the second casing 1 to be engaged with one end of the member 31, and locking the first casing 2 and the second casing 1. In this method, the lock member 31 made of synthetic resin is integrally provided with a knob 6 having a narrower width than the lock member 31 and a claw 32 held via a beam portion having low bending rigidity, and the guide groove is 25 includes a slot extending from the opening along the axial direction of the guide groove 25 and slidingly contacting the knob 6 to guide the knob 6; and a recess into which the pawl 32 of the locking member 31 is loosely fitted. Small recesses 33 and 34 are provided on the bottom surface of the recess to engage the arcuate tip 32C of the claw 32 in order to lock the locking member 31 in a predetermined position, and the opening of the guide groove 25 is provided. The lock member 31
When assembling the lock member 31 into the first housing 2 by inserting the lock member 31 from the other end, the lock member 31
The knob 6 is guided into the slot, and the pawl 32 of the locking member 31 is moved back to a position where it slides into contact with the guide groove 25 due to the deflection of the beam, and the locking member 31 is guided into the first slot. After being assembled into the casing 2, the claw 32 protrudes due to the elasticity of the beam and is fitted into the recess of the guide groove 25, whereby the locking member 31 is inserted into the first casing 2.
A lock mechanism that prevents escape from the device.