TWI411721B - A lock handle assembly for doors - Google Patents

Abstract

A lock handle assembly for doors is capable of reducing parts of an automatic lock mechanism, simplifying structure and reducing cost of manufacture, a lower end part of an operation handle is orthogonally provided with a lock embedding part and a guide groove hole, an upper end part of a spring lock is provided with a lock claw clamped with and disconnected from a lock groove part arranged on a back face wall part of a housing, a lower end part of the spring lock is provided with a spring support part, a rear end part of a lock core of a lock unit is provided with a drive cam projection, a longitudinal dimension and a lateral dimension of a cam driven hole of an intermediate part of the spring lock are greater than a diameter of the drive cam projection, a cam bevel part slidingly contacted with the back face part of the lock claw on the back face wall part of the housing is arranged at a front side position of the lock groove part. A lower edge part of the cam driven hole is pressed by the drive cam projection, and the lock claw is divorced from the lock groove part. By means of applying an up pushing force of a spring component, a longitudinal dimension of the lock claw upwards projecting to the cam driven hole from the guide groove hole is less than the diameter of the drive cam projection.

Description

Door lock device

The present invention relates to a door lock device for locking a door to a fixed frame while embedding the handle in the case body.

It is known that there is a door lock device having a so-called automatic locking function, which automatically pushes the operating handle into a predetermined position of the front concave portion of the casing body after the door is locked and locked. The handle is locked to the case body (refer to Patent Document 1).

The door lock device of Patent Document 1 accommodates a latch body and a lock unit at one end portion of the case body, and the latch system is biased toward the front end portion of the operation handle by the spring, thereby causing the locking claw portion to be disengaged. In the locking receiving portion of the operating handle, the locking unit can be pushed in a direction crossing the latch body when the rotor is in the unlocked position, and cannot be pushed in when the rotor is in the locked position, and is pushed in when the rotor is in the locked position. The latch body retracts the driver in a direction in which the engagement of the locking claw portion and the locking receiving portion is released.

Further, a cam slope is provided on the inner wall surface of the base end side of the slot provided in the latch body, and an operation portion is protruded from the rear end portion of the lock unit so as to enter the slot, and the operation portion is The front end portion is provided with a driving slope that is slidably coupled to the cam slope of the latch body, and the rear end portion of the rotor is formed into a shape formed by a pair of long sides and a pair of short sides intersecting the two ends of the long sides a cross section, wherein the length of the long side is set to be longer than an opening width of the slot of the latch body, and the length of the short side is set to be smaller than an opening width of the slot, when the rotor is located relative to the lock unit In the locked position, the long side is disposed in a direction intersecting the slot, and when the rotor is located at an unlock position with respect to the lock unit, the long side is disposed in a direction of the slot.

In the conventional lock device for a door having an automatic locking function, since the lock unit is embedded on the side of the casing body, the overall length of the casing body becomes long, and the occupied area in front of the door of the machine is vainly enlarged. .

Further, in the door lock device of the conventional example in which the lock unit constitutes a button for latching the gymnastic action, since the number of parts of the automatic lock mechanism portion is large, the structure cannot be simplified, and the manufacturing cost increases.

(previous technical literature)

(Patent Document 1): Japanese Invention Patent No. 2883560

An object of the present invention is to provide a door lock device which is provided with an automatic lock mechanism portion at an end portion of the handle itself, so that the entire device can be easily miniaturized.

Further, an object of the present invention is to provide a door lock device which can reduce the manufacturing cost of the entire apparatus by reducing the number of parts of the automatic locking mechanism portion and making a simple structure.

Furthermore, it is an object of the present invention to provide a door lock device having an operational convenience which is one-handed without causing a burden on the tumbler and the lock of the lock unit. The fingertip simply and surely performs a series of operations of releasing the automatic locking mechanism and pulling out the handle.

The invention of claim 1 is a door lock device which accommodates an operation handle in a longitudinally long concave portion fixed to a door body of the door, and a bearing cylinder portion on the back side of the upper end of the case body is accommodated a lock shaft, the front end hub portion of the lock shaft and the head of the operating handle are coupled by a horizontal pivot, and are pulled out from the front recess by pivoting the operating handle about the horizontal pivot After the pivoting and pulling out, the operating handle is rotated around the locking shaft, thereby disengaging the fixing metal plate fixed to the locking shaft from the buckle portion on the fixed frame side to release the door The fixed frame body is locked; the door lock device is characterized in that a lock embedding portion is formed at a lower end portion of the operation handle toward a front-rear direction, and is formed in an up-and-down direction so as to be orthogonal to a rear end portion of the lock embedding portion. a guiding slot, the plate-shaped latch body is inserted into the guiding slot hole so as to be slidable in the up-and-down direction, and a locking groove portion of the rear wall portion of the shell body is formed at an upper end portion of the latch body Closing and decoupling claw portion, in the aforementioned latch body The lower end portion forms a spring support portion for pushing the elastic spring member on the latch body, a rectangular cam follower hole is formed in an intermediate portion of the latch body, and a fixed lock unit is embedded in the lock embedding portion, and the lock is locked a rear end portion of the rotor of the unit is inserted into the cam follower hole of the latch body with a driving cam protrusion formed eccentrically from the center of rotation; the longitudinal dimension and the lateral dimension of the cam follower hole are both formed to be larger than the driving cam protrusion a large diameter portion, a cam slope portion that is slidably coupled to a rear surface portion of the latch portion of the latch body at a rear wall portion of the housing body at a front side position of the lock groove portion; by a key hole inserted into the rotor a key that rotates the rotor and urges the latch body back to the guide slot by pressing a lower side portion of the cam follower hole at a side portion of the drive cam protrusion to cause the latch body to be forward The lock claw portion is detached from the lock groove portion of the case body. On the other hand, when the rotation of the rotor by the key is stopped, the aforementioned lock claw of the latch body is caused by the spring force being pressed on the spring member. a length of a difference between a longitudinal dimension of the cam follower hole and a diameter of the driving cam protrusion protruding from the guiding slot, and when the operating handle is pushed into the front recess of the housing body, due to the back of the claw portion The portion is pressed by the cam slope portion on the side of the casing body, and the latch body is pushed into the guide groove against the biasing force of the spring member.

According to a second aspect of the invention, in the invention of claim 1, the longitudinal dimension of the handle is set to be shorter than a longitudinal dimension of the front recess of the case body, and the longitudinal dimension is used. a difference in size, in a state in which the handle is embedded, a fingertip insertion portion is formed at a lower end portion of the front concave portion, and a fingertip hook portion for partitioning the upper side of the fingertip insertion portion is formed at a lower end portion of the operation handle .

In the invention of claim 1, in the state in which the door is locked and the fixed metal plate is engaged with the door of the socket portion, the operating handle is pushed into the front concave portion of the casing body, and the locking claw of the latch body The portion is engaged with the lock groove portion on the side of the casing body, whereby the operating handle is held in the buried position. The engagement state of the latch body and the lock groove is maintained by pushing the spring member received on the guide slot of the operating handle.

By rotating the key inserted into the key hole of the rotor and pushing the lower side of the cam follower by the side portion of the driving cam protrusion, the latch body is pulled back into the guide slot and by the latch body The locking claw portion is disengaged from the locking groove portion of the casing body, and the locking of the operating handle with respect to the casing body is released.

While holding the key in the initial rotational position, the handle is pulled diagonally (centering the handle) to the front side of the housing body centering on the horizontal pivot. Then, when the key is pulled out from the key hole of the rotor, the latch body is pushed up by the spring force on the spring member, and the claw portion protrudes from the guide slot. Then, by rotating the operating handle about the locking shaft, the engagement between the fixing metal plate and the socket portion is released, and the locking of the fixing frame by the door is released.

After the door is opened to complete the required work, the door is again locked, the handle is rotated counter-rotating around the locking shaft, and the fixed metal plate is engaged with the socket portion, whereby the door is locked again with respect to the fixed frame.

Then, when the operating handle is pivotally pushed to the front concave portion of the casing body centering on the horizontal pivot, in the terminal region of the push-in pivoting, the rear portion of the locking claw portion of the latch body and the rear wall of the casing body The cam slope of the part abuts. After the abutment, when the operating handle is pushed in again, the latch body is pushed down by the cam slope portion, and the locking claw portion enters the guiding slot. When the operating handle is correctly pushed into the front concave portion of the casing body and the guiding slot is opposed to the locking groove portion, the latching system moves upward by the biasing force of the spring member, and the locking claw portion and the locking groove portion Re-engaged.

Thus, the door lock device of the invention of claim 1 has an automatic locking function for locking the operating handle to the casing body by a single action of pushing the operating handle into the casing body, the automatic locking mechanism portion a locking unit embedded in the lower end of the operating handle, a plate-like latch body inserted into the guiding slot of the operating handle, a locking groove portion of the rear wall portion of the housing body, inserted at the bottom of the guiding slot and latched a spring member between the spring support portions of the body, a drive cam protrusion formed by eccentricity of the rear end portion of the rotor of the lock unit, and a cam slope portion of the rear wall portion of the case body, and a latch for driving the cam protrusion to be inserted The driven cam hole in the intermediate portion of the lock body is formed in a rectangular shape in which the vertical dimension and the lateral dimension are larger than the diameter of the drive cam projection. Therefore, the number of parts of the automatic lock mechanism portion is saved to the limit and the structure is simplified. The manufacturing cost of the device as a whole can be reduced.

Further, since the main portion of the automatic locking mechanism portion is built in the lower end portion of the operating handle itself, the length of the casing body can be shortened and the entire device can be miniaturized.

In the invention of claim 2, in addition to the effect of the first item of the patent application range, the longitudinal dimension of the handle is set to be shorter than the longitudinal dimension of the front recess of the casing body, and the longitudinal dimension is used. The difference in size is such that, in the embedded state of the operating handle, a fingertip insertion portion is formed at a lower end portion of the front concave portion, and a fingertip hooking portion for arranging the upper side of the fingertip insertion portion is formed near the lock unit embedded portion to form an operation handle The lower end portion is thus inserted into the fingertip insertion portion by inserting another finger of the same hand as the finger holding the key, and hooking the fingertip to the fingertip insertion portion, with only one hand The ease of operation of the handle can be pulled out of the housing body.

When approaching the lock unit embedding portion and the handle does not have the fingertip insertion portion, it is necessary to pull down to the front side in a state where the key is rotated to the lock release position, by using a disk-tumbler loaded in the rotor of the lock unit or The pin-tumbler is engaged with the lock to pivotally pull out the handle. However, the use of the key imposes an excessive burden on the lock cylinder and the lock, resulting in wear of the lock cylinder and the lock. damage.

The invention holds the fingertip in the position of the lock release position, hooks the fingertip on the fingertip hooking portion located near the lock unit, and pivotally pulls out the operation handle, so that the lock cylinder is not The contact portion of the lock contact and the lock itself cause an excessive burden.

In the embodiment of the drawing, the door 3 of the front opening 2 of the fixed casing 1 such as the machine storage box main body is opened and closed, and the door 3 is attached to the fixed casing 1 by a hinge (not shown) on the right side of Fig. 5 . The fixing opening 5 of the case body 4 is formed at the left end side of the door 3. The case main body 4 in which the fixing opening 5 is fitted from the front side of the door 3 abuts the outer peripheral flange portion 6 on the front surface of the door 3. The spacer body 7 of the U-shaped cross section is covered from the back side of the case body 4, and the two tapping screws 46 penetrating the through hole 8 of the gasket body 7 are screwed into the back wall portion 9 of the case body 4, thereby being interposed. The pad 10 locks the gasket body 7 to the back of the door 3.

The longitudinally-shaped front recessed portion 11 fixed to the casing body 4 of the door 3 in the above manner accommodates the operating handle 12 in an detachable manner, and the bearing cylinder portion 13 on the upper rear side of the casing body 4 houses the locking shaft 14 . In the outer peripheral groove portion 16 of the lock shaft 14, an O-ring 47 is housed. At the end hub portion 15 of the locking shaft 14, the head 16 of the operating handle 12 is coupled by a horizontal pivot 17, and the operating handle 12 can be pulled out from the front recess 11 about the horizontal pivot 17 (i.e., the handle 12 is operated When the lower end is pulled out, the upper end of the operating handle 12 is pivoted about the horizontal pivot 17 and the operating handle 12 is obliquely projected. Then, the operating handle 12 protruding obliquely from the casing body 4 is rotated around the periphery of the upper locking shaft 14, and the fixing metal plate 18 is detached from the buckle portion 19 on the fixed frame side, and the door 3 is released from the fixing frame 1. Locked.

The fixed metal plate 18 is fitted to the rear corner shaft portion 20 behind the lock shaft 14, and is fixed to the lock shaft 14 by the bolt 23 via the rotation angle restricting disk 21 and the washer 22. On the back surface of the head portion 16 of the operating handle 12, inclined faces 24, 25 which are inclined opposite to each other are formed. The end boss portion 15 is inserted into the expansion slot portion 26 extending through the slopes 24, 25 before the locking shaft 14. A spring plate 27 is fitted to the base portion of the front end boss portion 15, and the spring plate 27 is compressed by operating the head portion 16 of the shank 12. In detail, the intersection ridges of the two inclined faces 24, 25 of the head portion 16 are pressed against the front surface of the spring plate 27 at the point P, and when the operating handle 12 is correctly embedded in the front concave portion 11 of the case body 4, the foregoing The crimping point P is located on the upper side of the horizontal axis L of the locking shaft 14. Therefore, the elastic reverse force of the spring plate 27 acts in the counterclockwise direction around the horizontal pivot 17 in Fig. 7, and the operating handle 12 is held in the buried state.

The longitudinal dimension of the operating handle 12 is set to be shorter than the longitudinal dimension of the front recess 11 of the casing body 4, and the longitudinal dimension difference between the two is used in the buried state of the operating handle 12 at the lower end of the front recess 11 The fingertip insertion portion 28 is formed. A fingertip hooking portion 29 for partitioning the upper side of the fingertip insertion portion 28 is formed at the lower end portion of the operating handle 12.

The lock embedding portion 30 is formed in the lower end portion of the operating handle 12 in the front-rear direction, and the guide slot hole 31 is formed in the vertical direction so as to be orthogonal to the rear end portion of the lock embedding portion 30. A plate-shaped latch member 32 is inserted into the guide slot 31 so as to be slidable in the up-down direction. A claw portion 34 that engages and disengages with the lock groove portion 33 of the back wall portion 9 of the case body 1 is formed at an upper end portion of the latch body 32. A spring support portion 36 for urging the spring member 35 of the latch body 32 is formed at a lower end portion of the latch body 32, and a rectangular cam follower hole 37 is formed at an intermediate portion of the latch body 32. The lock unit that is embedded in the lock embedding portion 30 is a known cylinder lock type. At the rear end of the rotor 39 of the lock unit 38, a drive cam projection 40 is formed eccentrically from the center of rotation.

The latch body 32 into which the drive cam protrusion 40 is inserted is formed in a longitudinal dimension and a lateral dimension which are larger than the diameter of the drive cam protrusion 40. At the rear wall portion 9 of the case body 4, the latch body 32 is provided. The cam slope portion 42 that is in sliding contact with the back surface portion 41 of the lock claw portion 34 is formed at a front side position of the lock groove portion 33.

When the rotor 39 is rotated by a predetermined angle (140 degrees in the present embodiment) by the key 44 inserted into the key hole 43 of the rotor 39, the cam follower hole 37 is pressed by the side portion of the drive cam projection 40. The lower side portion 45 retracts the latch body 32 into the guide slot 31 and disengages the pawl portion 34 of the latch body 32 from the lock groove portion 33 of the case body 4.

After the operation handle 12 is unlocked in the above manner, the finger of the same hand other than the thumb and the index finger of the grasping key 44 (for example, the ring finger 45) is inserted into the fingertip insertion portion 38, and the fingertip is hooked. The operating handle 12 is pivotally pulled out from the case body 4 at the aforementioned fingertip insertion portion 29. The intersection ridge line of the two inclined faces 24, 25 of the head 16 of the operating handle 12 and the crimping point P of the spring plate 27 are at the moment when the point P faces the center axis L of the locking shaft 14 toward the lower side, and the spring plate 27 The direction of action of the elastic counter-pulling force is reversed, and the operating handle 12 is biased to the spring plate 27 to protrude from the casing body 4 to rotate.

Since the rotation operation of the key 44 and the pulling operation of the operating handle 12 can be performed by the same one-handed finger, it is easy to operate.

When the key 44 rotor 39 is stopped, the locking claw portion 34 of the latch body 32 protrudes from the guide slot 31 by the longitudinal dimension of the cam follower hole 37 due to the biasing of the spring member 35 formed by the compression spring. The length is different from the size of the diameter of the drive cam protrusion 40. At this stage, since the operating handle 12 is in a state of being obliquely protruded, it is impossible to cause an unintended re-engagement of the claw portion 34 and the guide slot 31.

After the door 3 is opened and the required work is completed, the door 3 is again locked, the operating handle 12 is rotated counterclockwise about the locking shaft 14, and the fixing metal plate 18 is engaged with the buckle portion 19, whereby the door 3 is opposed to The fixed frame 1 is locked again.

Then, the operating handle 12 is pivotally pushed to the front recess 11 of the case body 4 centering on the horizontal pivot 17, and in the terminal region of the pivoting push, the back portion 41 of the pawl portion 34 of the latch body 31 is The cam slope portion 42 of the rear wall portion 9 of the case body 4 is in contact with each other. After the abutment, when the operating handle 12 is pushed in again, the latch body 32 is pushed down by the cam ramp 42 and the pawl portion 34 enters the guiding slot 31. When the operating handle 12 is correctly pushed into the front recess 11 of the casing body 4 and the locking groove portion 33 faces the guiding slot 31, the latch body 32 is moved upward by the spring member 35, The lock claw portion 34 is again engaged with the lock groove portion 33. That is, the locking of the operating handle 12 and the housing body 4 is automatically established.

The back surface portion 41 of the lock claw portion 34 of the latch body 32 is formed as a curved surface. In the present embodiment, a cylinder lock of a known lock cylinder type in which the lock cylinder 48 is loaded in the rotor 39 is used. However, a lock cylinder of a known lock cylinder type may be used as the lock unit.

1. . . Fixed frame

2. . . Fixing the front opening of the frame

3. . . door

4. . . Shell body

5. . . Opening for fixing the shell body

6. . . Shell outer peripheral flange

7. . . Gasket body

8. . . Buckle hole for gasket body

9. . . The back wall of the shell body

10. . . pad

11. . . Front recess of the shell body

12. . . Operating handle

13. . . Bearing body of the shell body

14. . . Locking shaft

15. . . Locking shaft front end hub

16. . . Locking shaft outer peripheral groove

17. . . Horizontal pivot

18. . . Fixed metal plate

19. . . Fixing the side of the frame side

20. . . After locking the shaft, the end angle shaft

twenty one. . . Rotation angle limit disk

twenty two. . . washer

twenty three. . . bolt

24, 25. . . The slope of the head of the handle

26. . . Expansion slot of the handle

27. . . Spring plate

28. . . Finger tip insertion portion of front concave portion

29. . . Fingertip hook

30. . . Operating handle lock embedding

31. . . Guide slot for the handle

32. . . Latch body

33. . . Lock groove part of the shell body

34. . . Latch body locking claw

35. . . Spring member

36. . . Spring support

37. . . Cam follower hole of latch body

38. . . Lock unit

39. . . Lock unit rotor

40. . . Drive cam protrusion

41. . . The back part of the claw

42. . . Cam slope of the shell body

43. . . Rotor keyhole

44. . . key

45. . . Ring finger (lower side)

46. . . Tapping screw

47. . . O ring

48. . . Lock cylinder

L. . . Central axis of the locking shaft

P. . . Inclined ridges

Fig. 1 is a view showing a lock handle device for a pull-out operation type door according to an embodiment of the present invention.

Fig. 2 is a rear view of the door lock device of Fig. 1.

Fig. 3 is a left side view of the door lock device of Fig. 1.

Fig. 4 is a right side view of the door lock device of Fig. 1.

Figure 5 is a plan view of the door handle device of Figure 1.

Figure 6 is a bottom plan view of the door lock device of Figure 1.

Figure 7 is a cross-sectional view taken along line A-A of Figure 1.

Fig. 8 is an enlarged explanatory view showing an automatic locking mechanism portion of the door lock device of Fig. 1.

Fig. 9 is an explanatory view showing the operation of pivoting and pivoting of the operating handle.

4. . . Shell body

6. . . Shell outer peripheral flange

9. . . The back wall of the shell body

10. . . pad

11. . . Front recess of the shell body

12. . . Operating handle

28. . . Finger tip insertion portion of front concave portion

29. . . Fingertip hook

30. . . Operating handle lock embedding

31. . . Guide slot for the handle

32. . . Latch body

33. . . Lock groove part of the shell body

34. . . Latch body locking claw

35. . . Spring member

36. . . Spring support

37. . . Cam follower hole of latch body

38. . . Lock unit

39. . . Lock unit rotor

40. . . Drive cam protrusion

41. . . The back part of the claw

42. . . Cam slope of the shell body

46. . . Tapping screw

48. . . Lock cylinder

Claims (2)

A locking device for a door, wherein an operating handle is received in an elongated front recess fixed to the shell body of the door, and a bearing shaft is received on a bearing cylinder portion on the back side of the upper end of the shell body, the front end hub of the locking shaft And the head of the operating handle is coupled by a horizontal pivot, and is pulled out from the front recess by pivoting the operating handle about the horizontal pivot, and the operation is performed after the pivoting is pulled out The handle rotates around the periphery of the locking shaft, thereby disengaging the fixed metal plate fixed to the locking shaft from the buckle portion on the side of the fixed frame body to release the lock of the door to the fixed frame; the door The lock handle device is characterized in that a lock embedding portion is formed in a front end portion of the operation handle toward a front-rear direction, and a guide slot is formed in an up-and-down direction so as to be orthogonal to a rear end portion of the lock embedding portion, and a plate-like latch is formed. The lock body is inserted into the guide slot hole so as to be slidable in the vertical direction, and a latch portion that engages and disengages with the lock groove portion of the rear wall portion of the case body is formed at an upper end portion of the latch body. The lower end of the latch body forms a latch on the upper side of the latch body A spring-shaped support portion of the spring member forms a rectangular cam follower hole in the intermediate portion of the latch body, and a fixed lock unit is embedded in the lock embedding portion, and the rear end portion of the rotor of the lock unit is eccentric from the center of rotation The driving cam protrusion formed in the manner is inserted into the cam follower hole of the latch body; the longitudinal dimension and the lateral dimension of the cam follower hole are both formed larger than the diameter of the driving cam protrusion, and the back wall of the shell body is a cam slope portion that is slidably coupled to a rear surface portion of the latch portion of the latch body at a front side position of the lock groove portion; the rotor is rotated by a key inserted into a key hole of the rotor, and a side surface portion of the driving cam protrusion presses a lower edge portion of the cam follower hole, and the latch body is retracted to the guiding slot hole, and the latching claw portion of the latch body is removed from the lock groove portion of the shell body Disengagement, on the other hand, when the rotation of the rotor is stopped by the aforementioned key, the aforementioned claw portion of the latch body protrudes from the aforementioned guide slot by the above-mentioned spring member pushing the biasing force The length of the longitudinal dimension of the driven hole is different from the diameter of the diameter of the driving cam protrusion, and when the operating handle is pushed into the front concave portion of the casing body, the back surface portion of the claw portion is the cam slope of the casing body side. The portion pushes the latch body into the guide slot hole against the biasing force of the spring member. A locking device for a door, wherein an operating handle is received in an elongated front recess fixed to the shell body of the door, and a bearing shaft is received on a bearing cylinder portion on the back side of the upper end of the shell body, the front end hub of the locking shaft And the head of the operating handle is coupled by a horizontal pivot, and the operating handle is pivoted from the front recess by pivoting about the horizontal pivot, and the operating handle is opened after the pivoting Rotating around the locking shaft, thereby disengaging the fixed metal plate fixed to the locking shaft from the buckle portion on the side of the fixed frame body to release the lock of the door to the fixed frame; The lock handle device is characterized in that the longitudinal dimension of the handle is set to be shorter than the longitudinal dimension of the front recess of the casing body, and the size difference between the longitudinal dimensions of the casing is used, and in the buried state of the handle a fingertip insertion portion is formed at a lower end portion of the front surface concave portion, and a fingertip hook portion for arranging an upper side of the fingertip insertion portion is formed at a lower end portion of the operation handle, and a lock is formed at a lower end portion of the operation handle toward a front and rear direction Buried section, a guide slot is formed in the vertical direction so as to be orthogonal to the rear end portion of the lock embedding portion, and the plate-shaped latch body is inserted into the guide slot hole so as to be slidable in the up-and-down direction, and the latch body is a locking claw portion that engages and disengages with a locking groove portion of a rear wall portion of the casing body, and a spring support portion that pushes a spring member for biasing a spring on a latch body at a lower end portion of the latch body, a middle portion of the latch body forms a rectangular cam follower hole, a fixed lock unit is embedded in the lock embedding portion, and a drive cam protrusion formed at an end portion of the rotor of the lock unit at an end portion eccentric from the rotation center is inserted into the latch a cam follower hole of the lock body; the longitudinal dimension and the lateral dimension of the cam follower hole are both formed larger than a diameter of the drive cam protrusion, and the rear lock wall of the cover body and the latch body of the latch body a cam slope portion that is slidably attached to the back portion of the portion is formed at a front side position of the lock groove portion; the rotor is rotated by a key inserted into a key hole of the rotor, and is pressed by a side portion of the drive cam protrusion The lower side of the cam follower hole, the latch body is retracted to the guiding slot, and the latching portion of the latch body is disengaged from the latching portion of the housing body, and when stopped, When the key rotates the rotor, the spring member presses the spring member to cause the claw portion of the latch body to protrude from the guiding slot hole to a longitudinal dimension of the cam follower hole and a diameter of the driving cam protrusion. The length of the difference in size, when the handle is pushed into the front recess of the housing body, the latch body resists the spring member because the back portion of the pawl portion is pressed by the cam slope portion of the shell body side The push-pull is pushed up into the aforementioned guide slot.