Latch

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a latch that locks or unlocks a door by pressing the front surface of the door.

【0002】

[Conventional technology]

As shown in FIG. 12, a striker 90 is attached to the door 88 of the audio device 86, and the striker 90 is locked or unlocked by a latch 92 provided on the audio device 86 side to open and close the door 88. It has become like.

【0003】

By the way, in such a latch 92, the trace pin 96 swingably attached to the latch body 94 engages with the recess 100A of the cam groove 100 formed in the housing 98, so that the latch body 94 is formed by the coil spring 104. It is designed to be locked (impossible to escape) against the urging force. At this time, the holder 102 that locks the striker 90 is located in the housing 98 in a tilted state and holds the striker 90.

【0004】

However, when the door 88 was open, the holder 102 was pushed by hand and the latch 92 was locked, and when the door 88 was closed strongly, the striker 90 and the holder 102 A head-on collision of the front 102A can damage either the striker 90 or the latch 92, making it unusable.

【0005】

[Problems to be Solved by the Invention]

In consideration of the above facts, it is an object of the present invention to make it possible to lock the striker without damaging the striker and the latch even if the striker is forcibly pushed in when the latch is in the locked state.

【0006】

[Means for solving problems]

In the invention according to claim 1, a circulation cam groove is formed in a latch body slidably housed in a housing. Then, when the latch body is pushed into the housing, the trace member provided in the housing circulates in the circulation cam groove, locks the circulation cam groove, resists the urging force of the urging means, and the latch body is released from the housing. Lock it so that it does not come out. Next, when the latch body is pushed into the housing, the trace member circulates in the circulation cam groove to release the locked state of the circulation cam groove, so that the latch body is pulled out of the housing by the urging means and unlocked. ..

【0007】

Here, in the state where the latch body is unlocked, the holder swingably connected to the extraction side of the latch body is pushed by the urging means and stands up from the housing. Therefore, when the door is closed, the hook portion of the striker hits the locking portion formed on the holder and pushes the holder into the housing while tilting it.

【0008】

Through such an operation, the hook portion of the striker is locked to the locking portion of the holder, and the latch body is locked in the housing.

【0009】

Here, it is assumed that the door is accidentally closed when the latch body is locked in the housing, that is, when the holder is tilted and located in the housing.

【0010】

Then, the hook portion of the striker hits the invitation surface of the holder, and the invitation surface escapes due to the function of the evacuation means. Then, while the invitation surface escapes, the hook portion of the striker is guided to the locking portion of the holder, and the hook portion is locked by the locking portion.

【0011】

In this way, even if the latch body is in the locked state, the invitation surface escapes and the locking portion locks the hook portion of the striker, so that the striker and the latch are not damaged even if the door is closed by mistake.

【0012】

In the invention according to claim 2, the retracting means is provided in the housing and is a space capable of swinging in the direction in which the holder allows the invitation surface to escape. Therefore, even if the latch body is located inside the housing, when the hook portion hits the invitation surface, the holder swings toward the space side to release the invitation surface and lock the hook portion to the locking portion. Can be done.

【0013】

In the invention according to claim 3, the retracting means has a configuration in which the tip end portion of the locking portion on which the invitation surface is formed can be bent. Therefore, even if the latch body is located in the housing, when the hook portion hits the invitation surface, the tip portion bends and the invitation surface is released, so that the hook portion can be locked to the locking portion.

【0014】

BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIGS. 1 and 2, the latch 10 according to the first embodiment includes a housing 12, a latch body 36 inserted into the housing 12, and a holder 14 pulled into the housing 12.

【0015】

The housing 12 is an elastic claw 16 formed on a side surface, and is fixed to a mounting port 20 bored in a panel 18 of an audio device. A door 22 is attached to the panel 18 so as to be openable and closable by a hinge (not shown). A striker 24 is provided inside the door 22. The upper surface of the striker 24 is recessed to form a hook portion 24A that is locked to the locking portion 26 of the holder 14.

【0016】

Further, an insertion hole 28 is formed in the bottom surface 27 of the housing 12. An elastic claw piece 30 is provided at the center of the insertion hole 28. Then, the tip of the trace member 32 having a substantially U-shape is inserted from the insertion hole 28 into the housing 12, and the base end portion is fixed by the elastic claw piece 30.

【0017】

Further, a columnar spring receiver 38 extends in the longitudinal direction from the bottom surface 27 to the inside of the housing 12. A circular elongated hole 40 penetrating in the longitudinal direction of the latch body 36 of a substantially rectangular parallelepiped is inserted through the spring receiver 38.

【0018】

A compression coil spring 42 is wound around the spring receiver 38. One end of the compression coil spring 42 is supported by the bottom surface 27 of the housing 12, and the other end urges the base 14A of the holder 14 which is swingably connected to the latch body 14 by a thin hinge 44. With such a configuration, the latch body 36 is urged in the direction of coming out of the housing 12 via the holder 14, and the holder 14 is pushed upward and stands up with the thin hinge 44 as a fulcrum.

【0019】

On the other hand, on the front and back surfaces of the latch body 14, substantially heart-shaped heart cams 46 and 48 having different shapes are projected. The circumferences of the heart cams 46 and 48 are the circulation cam grooves 50 and 52.

【0020】

In the circulation cam groove 50, the side surface of the trace portion 54 of the trace member 32 contacts the wall surface of the heart cam 46, while in the circulation cam groove 52, the side surface of the trace portion 56 of the trace member 32 contacts the wall surface of the heart cam 48. It circulates while.

【0021】

That is, since the trace portions 54 and 56 of the trace member 32 circulate in different positions, when the trace member 32 is twisted and separated from the wall surface of the heart cams 46 and 48, the twisting force is eliminated and the trace member 32 is constant without reversing. It circulates in the direction.

【0022】

During this circulation movement, when the recesses 58 and 60 of the heart cams 46 and 48 are locked to the trace portions 54 and 56, the latch body 36 is locked while being pushed into the housing 12 (see FIG. 3), and the trace portion is also used. When the 54 and 56 are separated from the recesses 58 and 60, the compression coil spring 42 (see FIG. 2) allows the latch body 36 to escape from the housing 12.

【0023】

A stopper 62 is provided so as to project from the latch body 36, and the stopper 62 moves in a guide hole 64 formed along the longitudinal direction to the upper wall of the housing 12. Then, when the latch body 36 comes out of the housing 12, the stopper 62 hits the end of the guide hole 64 to prevent the latch body 36 from coming off the housing 12.

【0024】

On the other hand, as shown in FIGS. 1 and 2, the holder 14 is formed with a U-shaped locking portion 26 having an opening at the bottom in a side view. The locking portion 26 includes a back wall 26A, a top wall 26B, and a wall 26C having a height lower than that of the back wall 26A. A guide portion 64 that rises toward the front is provided in the central portion of the front surface of the wall 26C, and the slope of the guide portion 64 is an invitation surface 64A that inclines toward the end of the wall 26C.

【0025】

Further, as shown in FIG. 3, a space S is provided between the top plate 12A of the housing 12 and the rib 14B of the holder 14, and even when the latch body 36 is housed in the housing 12, the space S is provided. As shown in FIG. 6, the holder 14 can swing toward the space S.

【0026】

Next, the operation of the latch 10 according to this embodiment will be described. As shown in FIGS. 1 and 2, in the normal use state, that is, in the state where the latch body 36 is unlocked and the holder 14 protrudes from the housing 12, the locking portion is locked when the door 22 is closed. The hook portion 24A of the striker 24 directly hits the back wall 26A of the 26, and as shown in FIG. 3, the holder 14 can be pushed into the housing 12 while tilting.

【0027】

As a result, the trace portions 54 and 56 of the trace member 32 circulate through the circulation cam grooves 50 and 52 while generating a twisting force, and reach the recesses 58 and 60. Here, when the pressing operation by the door 22 is stopped, the overstroke portion is eliminated by the compression coil spring 42, and the trace portions 54 and 56 lock the recesses 58 and 60. As a result, the latch body 36 is held in the housing 12 in a pushed state (see FIG. 3).

【0028】

At this time, the striker 24 is locked to the holder 14 and the closed state of the door 22 is maintained.

【0029】

Next, when the door 22 is pressed again, as shown in FIG. 4, the back wall 26A is pushed by the hook portion 24A, and the trace portions 54 and 56 of the trace member 32 are recessed 58 and 60 of the circulation cam grooves 50 and 52. The latch body 36 is released from the locked state. Here, the compression coil spring 42 pushes the latch body 36 in the extraction direction, and the latch body 36 is in the extracted state from the housing 12.

【0030】

At this time, the holder 14 is also pushed out from the housing 12, so that the striker 24 is released and the door 22 is opened as shown in FIG.

【0031】

On the other hand, as shown in FIG. 5, it is assumed that the latch body 36 is in the locked state, that is, the holder 14 is tilted and positioned in the housing 12, but the door 22 is closed.

【0032】

At this time, as shown in FIGS. 5 to 6, the hook portion 24A of the striker 24 hits the invitation surface 64A of the guide portion 64, and the holder 14 swings toward the space S around the thin hinge 44. Therefore, the hook portion 24A is guided to the locking portion 26 and locked to the locking portion 26 in a manner as if invited by the invitation surface 64A (see FIG. 3).

【0033】

Therefore, even if the door 22 is accidentally closed when the latch body 36 is in the locked state, the striker 24 and the latch 10 are not damaged.

【0034】

Next, the latch 68 according to the second embodiment will be described. In the second form, as shown in FIGS. 7 to 10, the locking portion 72 of the holder 70 swingably connected to the latch body 36 by a thin hinge 44 has a substantially U-shape when viewed from the side. , Back wall 72A, top wall 72B, and main wall 72C.

【0035】

The end of the wall 72C faces the back wall 72A so as to be folded back, and the hook portion 74A of the striker 74 bent in an L shape is locked by being sandwiched between the back wall 72A and the end of the wall 72C. It has become like. Further, as shown in FIG. 10, the wall 72C can be bent around the bent portion.

【0036】

In such a configuration, when the latch body 36 is locked, if the hook portion 74A hits the front surface of the wall 72C as an invitation surface, the wall 72C bends toward the top wall 72B and returns when the hook portion 74A passes. Then, as shown in FIG. 9, the hook portion 74A can be locked by the locking portion 72.

【0037】

Therefore, as in the first embodiment, when the latch body 36 is in the locked state, even if the door 22 is accidentally closed, the striker 74 and the latch 68 are not damaged. Further, by increasing the hardness of the wall 72C, the force for holding the door 22 in the closed state does not change.

【0038】

In the latch 76 according to the third embodiment, as shown in FIG. 11, the locking portion 80 of the holder 78 is composed of a back wall 80A and a side wall 80B extending from the widthwise end of the back wall 80A to the front surface. There is.

【0039】

A blade plate 82 extends diagonally downward from the upper part of the side wall 80B. The front side of the blade plate 82 is cut diagonally toward the back wall 80A to form an invitation surface 82A.

【0040】

In such a configuration, when the hook portion 74A of the striker 74 hits the invitation surface 82A while the latch body 36 is locked, the blade plate 82 bends toward the side wall 80B and guides the hook portion 74A to the locking portion 80. And lock. Therefore, as in the first embodiment, when the latch body 36 is in the locked state, even if the door 22 is accidentally closed, the striker 74 and the latch 76 are not damaged.

【0041】

In the latch of the present invention, it is not necessary to close the door with the striker after confirming the lock of the latch in the assembly line of the audio equipment or the like, so that the work procedure can be simplified.

【0042】

[Effect of the invention]

Since the present invention has the above configuration, the striker can be locked without damaging the striker and the latch even if the striker is forcibly pushed in when the latch is in the locked state.

[Simple explanation of drawings]

[Figure 1]

It is a perspective view of the latch which concerns on 1st form.

[Figure 2]

It is sectional drawing which shows the unlocked state of the latch which concerns on 1st form.

[Fig. 3]

It is sectional drawing which shows the state which the holder of the latch which concerns on 1st form has locked the striker.

[Fig. 4]

It is sectional drawing which showed just before the lock state of the latch which concerns on 1st form is released.

[Fig. 5]

It is sectional drawing which shows the state which pushed in the striker forcibly in the locked state of the latch which concerns on 1st form.

[Fig. 6]

It is sectional drawing which shows the state which the holder of the latch which concerns on 1st form escapes.

[Fig. 7]

It is a perspective view of the latch which concerns on the 2nd form.

[Fig. 8]

It is sectional drawing which shows the unlocked state of the latch which concerns on 2nd form.

[Fig. 9]

It is sectional drawing which shows the state which the holder of the latch which concerns on 2nd form has locked the striker.

[Fig. 10]

It is sectional drawing which shows the state which pushed in the striker forcibly in the locked state of the latch which concerns on 2nd form.

[Fig. 11]

It is a perspective view of the latch which concerns on 3rd form.

[Fig. 12]

It is sectional drawing of the conventional latch.

[Explanation of symbols]

12 housing 14 holder 26 Locking part 32 Trace member 36 Latch body 42 Compression coil spring (biasing means) 50 Circulation cam groove 52 Circulation cam groove 64A Invitation side 70 Holder (evacuation means) 72 Locking part S space (evacuation means)