JPH0571375U - Latch with lock mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the lock mechanism of the latch with lock mechanism and reduce the number of parts and the number of processing steps. A latch is composed of a frame member 5, a latch member 11 slidably fitted to the frame member 5, and a stopper member 13 rotatably fitted to the latch member 11, and the stopper member 13 has a cam surface. 14, the cam surface 14 and the frame member 5 are provided.
A cam follower 15 which also serves as an urging means of the latch member 11 is interposed between and. When the stopper member 13 is rotated within a predetermined angle range, the cam follower 15 approaches or separates from the frame member 5, and when the cam follower 15 approaches, the movement of the latch member 11 is locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a latch with a locking mechanism that can be incorporated in a flat handle.

[0002]

[Prior Art]

 Conventionally, flat handles have been widely used for doors of distribution boards. There are various restrictions on the mounting location of the flat handle, and various technologies have been proposed to reduce the size of the locking mechanism that locks the handle operation, rather than the flat handle itself. Japanese Utility Model Publication No. 3-54284, which is one of such proposals, has a relatively small size that can be incorporated into a flat handle mounting frame by simply increasing its length without changing its width and thickness. , A latch with a locking mechanism is disclosed.

[0003]

[Problems to be solved by the device]

 In this latch with lock mechanism, the sliding board integrally attached with the latch member has a structure in which the rear surface side of the flat handle mounting frame serves as a sliding surface and slides while being exposed. There is a problem that it bites and interferes with sliding. Further, in this latch, a spring for urging the metal ball toward the side wall of the fitting hole is embedded in the outer wall of the stopper which fits into the fitting hole of the latch member and rotates, while the side wall is not However, the stopper has a positioning mechanism that provides a moderation feeling by providing a fitting groove for fitting the metal ball, but it requires a large number of parts and processing man-hours, and there is a problem that the manufacturing cost increases. .

Therefore, according to the present invention, a blind plate is fixed to the rear surface of the frame member of the latch to cover the sliding member, and a cam surface is provided to the rotating stopper, and the sliding member is provided between the cam surface and the frame member. An object of the present invention is to solve the above-mentioned problem by forming a positioning mechanism that provides a moderation feeling by interposing a cam follower.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the gist of the present invention is as follows.

In this invention, a frame member having an operation window on the front side and a fitting groove on the rear side, and slidably fitted in the fitting groove to move forward and backward and lock the forward and backward movements. Based on the premise of a latch with a lock mechanism, which includes a latch member having a lock mechanism whose key insertion hole faces the operation window, and a holding means which holds the latch member in the fitting groove irremovably. ing.

In such a latch, a circular hole communicating with the key insertion hole is formed on the rear surface of the latch member, and the stopper member is rotatably fitted by the key operation. A cam follower that also functions as a biasing means in the latch forward direction is provided between the cam surface and the frame member, and a holding means for the fitting groove is fixed to the fitting groove. By using a blind plate, when the cam surface of the stopper member repeatedly rotates within a predetermined angle range by key operation, the cam follower repeatedly approaches and separates from the frame member, and when approaching, the latch is locked and separated. The feature is that the lock is released when you do.

In one of the preferred embodiments of the present invention, the cam surface is a part of a cylinder eccentric to the stopper member, and the tip of the cam follower under the action of the biasing spring is fitted into and disengaged from the cam surface. A possible fitting recess is provided to limit the rotation range of the cam.

In another preferred embodiment, the latch according to the present invention is used by being incorporated in a flat handle.

[0010]

[Action]

 In the latch according to the present invention, since the blind plate is fixed to the rear surface of the frame member after the latch member is slidably fitted in the fitting groove, foreign matter does not enter the fitting groove from the rear surface.

A cam surface formed of a part of a cylinder is provided at an eccentric position on the stopper member of the latch, and a cam follower which also serves as a biasing means in the latch forward direction is interposed between the cam surface and the frame member. When the cam follower is brought close to the frame member due to the movement of the cam surface, the cam follower acts as a pillar that prevents the latch member from retracting, and the movement of the latch is locked.

By providing the cam surface with the recesses into which the tips of the cam followers can be inserted and removed, at both ends of a predetermined rotation angle, a positioning means with a sense of moderation can be obtained.

[0013]

【Example】

 The details of the latch according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing a usage state of a flat handle 2 incorporating a latch 1 according to the present invention. In a distribution board consisting of a fixed frame 3 and a single-sided door 4, a flat handle 2 is attached to the door 4. The flat handle 2 is a frame member 5 fixed to the door 4, a handle 6 attached to the frame member 5 so as to be pivotable in the directions of arrows A and A ', and an insertion hole 8 for a key 50 in a front operation window 7 of the frame member. And the operating rib 9. The latch member 11 faces the operation rib 9, and the claw fitting 21 is attached to the rear surface of the frame member 5 from the inside of the door 4 so as to be rotatable. Corresponding to the turning of the handle 6 in the directions of arrows A and A ', the claws 21 turn in the directions of B and B', respectively, and engage or disengage from the inside of the fixed frame 3 to lock or lock the door 4. Although it can be unlocked, in FIG. 1, the state where the handle 6 is swung in the A ′ direction and the claw fitting 21 is detached is shown by a solid line, and the claw clasp when the handle 6 is swung in the A ′ to A direction is shown. The position of 21 is indicated by a virtual line.

2A and 2B are a cross-sectional view taken along the center line XX of FIG. 1 and a back view showing the details of the structure of the latch 1, but the handle 6 is A It is swung in the direction and is housed in the housing groove 22 of the frame member 5, and the tab 21 is not shown. The members constituting the ratchet 1 are slidably fitted in a frame member 5 which also serves as a frame member of the plane handle 2, and a fitting groove 23 provided on the rear surface side of the frame member 5 so as to move forward to the right and to the left. The latch member 11 that can be moved backward and backward, the stopper member 13 that rotatably fits into the circular hole 12 provided on the rear surface side of the latch member 11, and the stopper member 13 that is integrally provided on the rear surface side of the stopper member 13. The cam follower 15, which is interposed between the cam surface 14 and the end wall 24 of the frame member 5 and is urged by the urging spring 17 in the forward direction of the latch member 11, the latch member 11 and the like are removed into the fitting groove 23. It is a blind plate 16 or the like that is press-fitted in a fitting groove 23 for holding it disabled. However, in FIG. 2B, a part of the blind plate 16 is cut out.

The latch member 11 is biased in the forward direction by pressing the flange 32 of the cam follower 15 fitted in the groove 31 at the rear end thereof in the forward direction, and the latch engagement portion 33 provided at the front end of the latch member 11 of the handle 2. The handle 2 is locked by the locked portion 25 to lock the turning motion of the handle 2. Further, when the handle 2 is already turned in the A'direction, when the handle 2 is turned in the A direction, the tip end portion of the locked portion 25 pushes the latch locking portion 33 with the inclined surface portion 34, and the latch member 11 is pushed. While retracting against the biasing spring 17, the state of FIG. Further, when a fingertip is put in the operation window 7 and the operation rib 9 is moved leftward against the biasing spring 17, the latch member 11 is retracted, and the locking portion 33 is locked to the locked portion 25. The handle 2 can be unwound and swiveled in the A ′ direction.

The stopper member 13 has a guide protrusion 37 and a fitting groove 38 for the key 50 on the front surface side. When the key 50 is inserted into the key hole 8 of the latch member 11, the stopper member 13 is guided by the protrusion 37 and the key 50 and the key hole 8. The centers of the keys coincide with each other, and the tip of the key 50 fits in the fitting groove 38 (see also FIG. 1). When the key 50 is turned to the right, for example, the side wall 39 of the fitting groove 38 is pressed, and the stopper member 13 can be turned to the right (however, in the back view (b), left). On the rear surface side of the stopper member 13, there is a cam surface 14 formed of a part of a cylinder formed by stealing the meat, and the center of the cylinder is eccentric from the rotation center 40 of the member 13 on the center line XX. . When the stopper member 13 rotates and the cam surface 14 moves, the cam follower 15 moves forward and backward. As is apparent from FIG. 2B, the cam surface 14 is provided with V-shaped grooves 41 and 42 at the intersection with the center line XX so that the tip of the cam follower 15 can be fitted and the stopper member 13 is rotated. It stops at a certain position with a sense of moderation. In addition, the wall surfaces 43 and 44 of the stopper member 13 are adapted to abut against the cam follower 15 from the side when the stopper member 13 reaches a predetermined rotating position and stop the rotation.

The cam follower 15 has a front portion formed of a sharp end inserted into the side wall of the latch member 11 to contact the cam surface 14, and a biasing spring is provided between the flange 32 provided in the middle and the end wall 24 of the frame member 5. 17 is interposed. The flange 32 is pressed against the latch member 11 and biases the member 11 in the forward direction, and if the operating rib 9 is moved against this bias, the latch member 11 retracts.

The blind plate 16 is provided with an oval through hole 45, and a columnar protrusion 46 provided at the center of the stopper member 13 is inserted therethrough to abut the edge of the oval at each of the forward and backward positions of the member 13. By doing so, the forward / backward position of the latch member 11 is regulated.

FIG. 3 shows the latch 1 in the locked state by means of a sectional view (a) and a rear view (b) of the flat handle 2 as in FIG. In FIG. 3, the stopper member 13 and the cam surface 14 of FIG. 2 are in a state of being rotated 180 ° by the operation of the key 50. As the cam surface 14 rotates, the cam follower 15 retracts against the biasing spring 17, and when it rotates 180 °, the cam follower 15 makes a clicking sound and fits into the V-shaped groove 42, and almost simultaneously, the cam follower 15 becomes a stopper member. The wall surface 44 of the abutting member abuts against it, and the rotation stops. At this time, the rear end 47 of the cam follower 15 is close to the end wall 24 of the frame member 5 with a very small clearance, and even if the stopper member 13 is to be retracted, the rear end 47 is immediately adjacent to the end wall 24. And cannot be substantially retracted. Therefore, since the movement of the latch member 11 is in the locked state, the handle 2 is also in the locked portion 25. To unlock the latch member 11, the key 50 may be operated again to rotate the cam surface 14 in the opposite direction by 180 °. Since the key 50 is made symmetrical, and the keyhole 8 and the groove 38 are also made symmetrical, the key 50 can be freely inserted and removed each time it is rotated 180 °.

[0021]

[Effect of the device]

 In this invention, since the blind plate is fixed in the fitting groove of the frame member, there is no risk of foreign matter entering the fitting groove from the rear surface of the frame member, and the sliding of each member is not hindered.

Since the rotation range of the stopper member is regulated by the cam mechanism integrated with this member, the number of parts and the number of processing steps can be reduced and the manufacturing cost can be reduced as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of a flat handle incorporating a latch according to the present invention.

2 is a sectional view taken along the center line XX of FIG. 1 by (a), and a back view corresponding to (a) is shown by (b).

FIG. 3 is a sectional view (a) and a rear view (b) similar to FIG. 2 in which the latch member is locked.

[Explanation of symbols]

 1 Latch with lock mechanism 5 Frame member 7 Operation window 8 Key insertion hole 11 Latch member 12 Circular hole 13 Stopper member 14 Cam surface 15 Cam follower 16 Blind plate 23 Fitting groove 41, 42 Recessed part (V-shaped groove) 50 Keyed

Claims (3)

[Scope of utility model registration request] 1. A frame member having an operation window on the front side and a fitting groove on the rear side, and slidably fitted in the fitting groove to move forward / backward and lock the forward / backward movement. A latch with a lock mechanism, comprising: a latch member having a lock mechanism whose key insertion hole faces the operation window; and holding means for holding the latch member in the fitting groove irremovably. A circular hole communicating with the key insertion hole is provided on the rear surface of the member, and the stopper member is rotatably fitted by a key operation, and the stopper member is provided with a cam surface whose axis is a cam shaft. By interposing a cam follower, which also serves as a biasing means in the forward direction of the latch, between the cam surface and the frame member, the holding means for the fitting groove is a blind plate fixed to the fitting groove, The stopper member is operated by the key operation. When the cam surface repeatedly rotates within a predetermined angle range, the cam follower repeatedly approaches and separates from the frame member, the latch is locked when the cam member approaches the frame member, and the lock is released when the cam member separates from the frame member. The latch, wherein: 2. A fitting recess in which the cam surface is a part of a cylinder located eccentrically with respect to the stopper member, and the tip of the cam follower under the action of an urging spring can be fitted into and removed from the cam surface. The latch according to claim 1, wherein the latch is provided as a means for restricting the rotation range. 3. The frame member is integral with a frame member of a flat handle, and is used by being incorporated in the flat handle capable of locking the flat handle via the lock of the latch. The latch according to claim 1, wherein: