JP2920145B1 - Latch lock - Google Patents

Abstract

Kind Code: A1 The present invention provides a latch lock that can be handled by common parts and can be locked and unlocked, regardless of whether the door is opened left or right (or inside or outside). A ridge portion engageable with a latch guide is provided.
Are formed axially symmetrically on the upper surface and the lower surface of the latch head 3 about the central axis of the latch head 3 in the entering / exiting direction, and the latch head 3 is mounted upside down in accordance with the opening of the door D. In addition, a latch stopper 91 that protrudes into the latch housing portion 5 and prevents the latch head 3 from retreating.
And a lock lever 92 for causing the lock lever 92 to protrude and retract into the latch housing portion 5, and a thumb-turn connector 94 for operating the lock lever 92 in conjunction with the operation of a thumb-turn provided inside or outside the door D. 9 is provided in the lock case 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch lock, and more particularly to a latch lock, in which the latch head is closed while retracting in the same manner as a general latch lock. The present invention relates to a so-called reversing type latch lock in which a door is opened while reversing in a horizontal direction and retreating.

[0002]

2. Description of the Related Art As a reversing type latch lock, a latch lock described in, for example, Japanese Utility Model Publication No. 7-54504 is known.

[0003] A latch lock of this type includes a latch head having a substantially rhombic shape in plan view, a latch accommodating portion for accommodating the latch head so as to be able to enter and exit from the front surface of the lock case and being urged in a projecting direction, It comprises a latch guide that guides the head in and out to prevent the latch head from reversing, and a latch release mechanism that detaches the latch guide from the latch head in conjunction with handles and the like attached to the inside and outside of the door.

[0004]

However, due to the structure of the conventional reversing type latch lock, when the opening of the door is reversed inside or outside (or left and right), separate latches corresponding to each opening are used. Parts such as a latch head and a corresponding latch guide are required, which causes a problem that the manufacturing cost is high.

Accordingly, it is a first object of the present invention to provide a latch lock which can be handled by common parts regardless of whether the door can be opened inside or outside (or left and right).

In addition, since the conventional reversing type latch lock is operated by operating a latching / removing mechanism from both sides of the door, the door is always openable and closable, which causes inconvenience in the locking surface of the door. Was.

In view of the above, a second object of the present invention is to provide a latch lock which can be unlocked by incorporating a locking / unlocking mechanism which can prevent the latch head from retreating, separately from the latching / unlocking mechanism. The purpose is.

[0008]

In order to achieve the above object, a latch lock according to a first aspect of the present invention comprises a latch head having a substantially rhombic shape in plan view and a front portion of the latch head having a front surface of a lock case. A latch housing part that is housed so that it can be moved in and out, and is urged in a protruding direction via a latch push-out spring, and is always urged and engaged with the upper surface of the latch head to guide the latch head in and out. A latch guide that prevents the latch from reversing, and a latch release mechanism that releases the latch guide from the latch head in conjunction with the handle or switch of the door.When the door is closed, the latch head is guided by the latch guide and inserted into the latch housing. While the door is retracted and closed, when the door is opened, the latch guide is released from the latch head by the operation of the latch release mechanism, and the latch head is opened by the door opening force. In a reversing type latch lock in which the body is flipped in the horizontal direction and opened while retreating, protrusions which can be engaged with the latch guides are formed on the upper surface and the lower surface of the latch head, respectively, so that the door can be opened freely. By flipping the latch head up and down accordingly, the posture of the latch head is adapted to the opening of the door.

That is, the ridge portions engageable with the latch guide are formed on the upper surface and the lower surface of the latch head, respectively, so that the latch head can be turned upside down and mounted depending on the opening of the door. This makes it possible to use different types of doors with one kind of component.

In the latch lock according to the present invention, a latch play insertion hole through which a latch head can enter and exit is formed on a front surface of the lock case, and a lock face plate having substantially the same shape as the front surface is detachably attached. The lock face plate is characterized in that the lock face plate is formed with a latch inlet / outlet which can prevent the latch head from coming out by interfering with the ridges formed on the upper and lower faces of the latch head.

For this reason, even after the latch lock is attached to the door, the latch head can be pulled out of the lock case and turned upside down simply by removing the lock face plate from the front surface of the lock case. This makes it possible to change the opening of the door later.

Further, the latch lock according to the present invention is characterized in that the latch push-out spring has a front end and a rear end connected to a latch head and a latch housing, respectively.

Therefore, even when the lock face plate is removed from the front face of the lock case as described above, the latch head and the latch push-out spring do not protrude outside, and the loss of parts can be prevented.

According to a fourth aspect of the present invention, there is provided a latch lock, wherein the latching / unlocking mechanism moves up and down at least in association with a handle attached to the inside and outside of the door, and the latch guide is pushed up by the up / down lever. A push-up slider that lifts up, a push-down slider that is pushed down by an up-down lever, and a pivoting body that is rotatably supported between the push-down slider and the latch guide, and that rotates in conjunction with the downward movement of the push-down slider to push up the latch guide. It is characterized by having.

[0015] Thus, the door can be opened from both the inside and outside of the door by both the push-up operation and the push-down operation of the raising / lowering lever, and the components of the latching / unlocking mechanism are shared irrespective of the opening of the door. be able to. In addition, since the structure is also a compact configuration, the size of the entire latch lock can be reduced.

According to a fifth aspect of the present invention, there is provided a latch lock, wherein at least a latch stopper protruding from below into the latch housing to prevent the latch head from retreating, and one end of the latch lock is engaged with the latch stopper. A lever-shaped lock lever that is rotatably pivoted downward and that causes the latch stopper to protrude and retract into the latch housing portion by the rotation;
The lock lever is brought into contact with the other end of the lock lever, is connected to a thumb turn provided inside or outside the door, is rotatably supported by a shaft, and locks the lock lever by a locking projection formed on a part of the peripheral surface. A locking / unlocking mechanism comprising a rotating cam-shaped thumb-turn connector is provided in the lock case.

According to this, the lock lever is rotated by the operation of the thumb turn to cause the latch stopper to protrude into the latch accommodating portion, so that the retraction of the latch head is prevented and the door is locked. That is, separately from the latching / unlocking mechanism, the locking / unlocking mechanism operable from either inside or outside of the door is incorporated in the same lock case, so that the door can be locked, and the usability of the door becomes convenient. Further, since the structure is simple and compact, the latch lock can be incorporated in the lock case without particularly increasing the size.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the internal structure of the latch lock 1 of the present invention as viewed from the side. FIG. 2 shows the latch lock 1.
FIG. 3 shows the configuration of main parts housed in substantially the upper half of FIG.
Are the opening and closing directions of the door D provided with the latch lock 1 and the door frame F
3 shows an engaged state.

The latch lock 1 is accommodated in a lock case 2 composed of a lock case main body 2A and an upper lid 2B (see FIG. 4), and is embedded in the door D by engraving a prospective surface D1 of a vertical frame portion of the door D. . The lock case main body 2A is a metal box-shaped body having an open front side in FIG. 1, and has a side plate 21, a front plate 22, and a front plate 22 formed at the front, upper, lower and rear portions thereof, respectively, orthogonal to the side plate 21; Plate 23, bottom plate 24, and rear plate 25
And is formed from

The front plate 22 is provided with a square hole-shaped latch play insertion hole 26 substantially in the vicinity of the center thereof, so that a latch head 3 described later can freely enter and exit therefrom. Also,
The front plate 22 extends in the up-down direction, and has screw holes 27, 27 at its upper and lower parts, respectively. Further, on the front surface of the front plate 22, a lock face plate 4 made of a metal plate having substantially the same shape as the front plate 22 is stacked. This lock face plate 4
Also, the latch play insertion hole 26 and the screw holes 27 and 2 of the front plate 22 are provided.
7, a latch access hole 41 and screw holes 42, 42 are formed, respectively. And the lock face plate 4
The front plate 22 and the front plate 22 are overlapped and applied to the prospective surface D1 of the door D, and are fixed to the prospective surface D1 of the door D using the screw holes 27 and 42.

The latch head 3 is a metal pillar formed in a substantially rhombic shape in plan view, and is housed in a latch housing 5 provided in the lock case main body 2A. Latch housing 5
Is a box-shaped body made of resin having an open upper part and a front part. The inner surfaces of the bottom plate 51 and both side plates 52 guide the latch head 3 in and out. A side plate (not shown) on the front side in FIG. 1 of the latch housing portion 5 is formed so as to be separable in the front direction.

A latch push-out spring 53 composed of a compression coil spring is inserted between a rear portion of the latch head 3 and a rear plate 54 of the latch accommodating portion 5. As a result, the latch head 3 is always urged so that its front portion projects from the latch play insertion hole 26 provided in the front plate 22 of the lock case 2 and the latch access hole 41 provided in the lock face plate 4. I have. At the time of closing and opening the door, the latch head 3 moves the door frame F
The latch push-out spring 53 is compressed and retracted into the latch accommodating portion 5 while being brought into contact with the seat S (see FIG. 3) attached to the latch housing 5.

In FIG. 3, when the door D is opened in a direction indicated by an arrow OP and closed in a direction indicated by an arrow CL, the latch head 3 includes a front opening side surface 31 at a front portion and a door portion at a rear portion. The door-closing side surface 34 is made parallel to the door D surface, and the front door-closing side surface 3
2 and the rear opening side surface 33 of the rear part is housed in the latch housing part 5 in a state where the side is inclined with respect to the door surface in a normal state. An obtuse portion of the ridges formed by the side surfaces, that is, a continuous portion of the front opening side surface 31 and the rear opening side surface 33, the front closing side surface 32, and the rear closing side surface 34. Is processed into a loose curved surface. At a substantially center of the front door-closing side surface 32, a smooth surface resin 35 for smoothing contact with the lip portion S1 of the seat S is attached.

The rear portion of the latch head 3 is formed with a spring receiving portion 36 having a vertically central portion cut away from the rear door side surface 34 and the rear door side surface 33 at the rear. The front end of the aforementioned latch push-out spring 53 is inserted inside the spring receiving portion 36.
The front end of the latch pushing spring 53 is formed in a hook shape,
The latch head 3 is engaged with a spring receiving pin 37 inserted into the spring receiving portion 36 of the latch head 3 from above or below.
It is connected so that it does not separate from. The rear end of the latch push-out spring 53 is fitted to a spring mounting portion 55 protruding from the rear plate 54 of the latch housing 5 and is connected so as not to come off.

On the upper and lower surfaces of the latch head 3, elongated ridges 38,
38 are formed. These ridges 38 are formed exactly in the middle between the front door-side side surface 31 and the rear door-side side surface 34 so as to be parallel to the both side surfaces.

As described above, this latch head 3
The front portions of the latch case 3 protrude from the latch play insertion holes 26 of the front plate 22 of the lock case 2 and the latch access holes 41 of the lock face plate 4. The opening height of the latch head 3 so that the
It is formed slightly larger than the total height. On the other hand, the latch access hole 41 of the lock face plate 4 is
The opening height is formed slightly smaller than the opening height of the latch play insertion hole 26 so that only the forward part can be inserted. Therefore, in the latch head 3 urged in the protruding direction by the latch push-out spring 53, the upper and lower ridges 38 interfere with the upper and lower edges of the latch access hole 41 of the lock face plate 4 and cannot be further protruded. That is, these ridges 3
Reference numeral 8 denotes a stopper for preventing the latch head 3 from jumping out of the lock case 2. Also,
A latch stop frame 43 made of resin is attached to the back side of the peripheral edge of the latch access hole 41 provided in the lock face plate 4, whereby the protrusion dimension of the front part of the latch head 3 is adjusted, and The impact noise generated at the time of protrusion is also mitigated.

The protruding ridges 38 located on the upper surface among the above-described upper and lower protruding ridges 38 are engagement portions that engage with the latch guide 6. The latch guide 6 guides the ingress and egress of the latch head 3, prevents the latch head 3 from being turned in the horizontal direction, and maintains the attitude of the latch head 3. The latch guide 6 is constantly biased on the upper surface of the latch head 3. Contacted in state. Then, it is lifted by the operation of the latching / removing mechanism 7 described later, and is separated from the latch head 3.

The latch guide 6 is composed of a latch holding plate 61 having a substantially L-shape as viewed from the side by raising a rear portion of a horizontal plate body upward, and an elevating body 62 connected to the rear portion. . The latch holding plate 61 is made of metal, and the elevating body 62 is made of resin, and these are integrated by insert molding. A guide groove 63 is formed in a horizontal portion of the latch holding plate 61 so as to extend forward and backward in the center in the width direction. The guide groove 63 is formed to have a width that allows the protrusion 38 provided on the latch head 3 to be sandwiched therebetween, and the guide groove 63 is held in a state where the latch pressing plate 61 is in contact with the upper surface of the latch head 3.
Of the ridge 38 can be guided to move back and forth.

The elevating body 62 has a head portion 62a for supporting the rising portion of the latch pressing plate 61, and leg portions 62b extending below the head portion 62a. The leg portion 62b is housed between a resin partitioning member 81 provided in the lock case 2 and the rear plate 54 of the latch housing portion 5, and is guided up and down by the members. As shown in FIG. 4, a vertically long cutout portion 62c is formed on one side of the leg portion 62b, and a latch presser spring 64 made of a compression coil spring is inserted inside the cutout portion 62c. The latch holding spring 64 is inserted with its upper end in contact with a spring holding piece 82 attached to the partition member 81 and its lower end in contact with the leg 62 b of the elevating body 62. Is constantly biased downward. Thereby, the latch guide 6
Are always engaged with the upper surface of the latch head 3.

A latch release mechanism 7 for releasing the latch guide 6 from the latch head 3 includes two raising / lowering levers 71, 71 which move up and down in conjunction with handles (not shown) attached to the inside and outside of the door D; A push-up slider 72 pushed up by the lever 71, a push-down spring 73 for urging the push-up slider 72 downward, a push-down slider 74 pushed down by the up-down lever 71, and a push-up spring 75 for pushing up the push-down slider 74; And a rotating body 76 that pushes up the latch guide 6 in conjunction with the lowering of the pressing slider 74. These are accommodated at predetermined positions in a partition member 81 provided in the lock case 2, respectively.

The two raising / lowering levers 71 extend in directions opposite to each other and protrude inside and outside the door D. As shown in FIG. 3, at the center of the lock case 2 in the thickness direction, the tips of the lock cases 2 face each other in a chipped manner, and each can be moved up and down with a slight interval.

Push-up slider 72 and push-down slider 74
Are resin components having a substantially prismatic shape.
The bottom surface of the pressing slider 74 and the bottom surface of the pressing slider 74 are each formed with a bottomed round hole, into which a pressing spring 73 and a pressing spring 75 made of a compression coil spring are inserted, respectively. A latch guide lifting piece 72a protruding forward is formed on the upper part of the push-up slider 72, and this is in contact with the lower surface of a claw piece 62d formed on the head 62a of the lifting / lowering body 62 of the latch guide 6.

The rotating body 76 is connected to the leg 62 of the latch guide 6.
b is a lever-shaped resin component rotatably supported at a substantially intermediate position between the lower end of the push slider 74 and the lower end thereof, while the rear portion thereof abuts a cutout portion 74 a formed at the lower portion of the push slider 74. The front part is the leg part 62 of the elevating body 62 of the latch guide 6.
b is in contact with the lower end.

The operation of each part of the thus constructed latch lock 1 when the door is closed and when the door is opened is as follows.

First, at the time of closing the door, as shown in FIG. 5, the latch head 3 protruding from the lock surface of the latch lock 1 is provided on the door frame F with the front closing side surface 32 inclined. It contacts the seat S. Then, it is pushed into the latch housing portion 5 by the receiving seat S, and retreats while compressing the latch pushing spring 53 (omitted in FIG. 5). At this time, the latch holding plate 61 of the latch guide 6 is provided on the upper surface of the latch head 3.
And the guide groove 63 is engaged with the ridge 38 on the upper surface of the latch head 3, so that the latch head 3 retreats along the guide groove 63 while maintaining its posture. When the front end of the latch head 3 enters the latch hole S2 provided in the seat S, the latch head 3 projects again by the urging force of the latch pushing spring 53, and the latch hole S2
And the state shown in FIG. 3 is obtained. In this state, since the latch guide 6 is still engaged with the latch head 3, the latch head 3 does not change its posture even if the door D is pushed or pulled in the opening direction. Thus, the latch head 3 is caught by the latch hole S2, and the door closed state is maintained.

On the other hand, when the door is opened, a handle (not shown) such as a lever handle or a knob provided on the door D is moved, and one of the raising / lowering levers 71 connected thereto is operated. When the raising / lowering lever 71 is pushed up, the lifting slider 72 rises while compressing the pressing spring 73 mounted on the upper portion thereof, and is formed on the head 62a of the lifting / lowering body 62 of the latch guide 6 by the latch guide lifting piece 72a. The claw piece 62d is lifted. As a result, the latch guide 6 rises, and the latch pressing plate 61 is separated from the upper surface of the latch head 3. When the raising / lowering lever 71 is pressed down, the pressing slider 74 descends while compressing the push-up spring 75 inserted in its lower part, and pushes down the rear part of the rotating body 76. Then, the rotating body 76 rotates clockwise in FIG. 1, and lifts the elevating body 62 of the latch guide 6 at the front portion. As a result, the latch guide 6 rises, and the latch pressing plate 61 is separated from the upper surface of the latch head 3.

When the latch guide 6 is disengaged from the latch head 3 by pushing up or pushing down the raising / lowering lever 71, the latch head 3 is disengaged and its posture can be reversed in the horizontal direction. . When the door D is pushed or pulled in the opening direction in this state, as shown in FIG. 6, the latch head 3 is turned counterclockwise while the front side 31 on the opening side is pushed by the seat S, as shown in FIG. The door opening side surface 31 at the front is inclined. Door D
When the latch head 3 is to be opened, the latch head 3 retreats into the latch accommodating portion 5 with the posture as it is. When the door is opened, the front end of the latch head 3 is connected to the latch hole S2
When it comes out completely from, it is projected again by the urging force of the latch pushing spring 53 (omitted in FIG. 6). Here, when the handle is returned to the original position, the latch guide 6 is lowered and the latch head 3 is returned again.
And returns to the same posture as the state before the door is closed (FIG. 5).

As described above, the latch head 3 is formed with the ridges 38 on its upper and lower surfaces. These ridges 38 are formed exactly in the middle between the front door-side side surface 31 and the rear door-side side surface 34 so as to be parallel to both side surfaces. Therefore, when the latch head 3 is turned upside down and accommodated in the latch accommodating portion 5, the latch head 3 assumes a posture in which the front side 32 on the front side of the door is inclined toward the opposite side of the door D, and The protrusion 38 on the opposite side is the latch guide 6
Will be engaged. Thereby, the operation of the latch head 3 at the time of opening the door and at the time of closing the door is opposite to the vertical direction in the figure with respect to the posture shown in FIGS. 5 and 6, respectively, and the opening / closing direction of the door D can be reversed. it can. That is, without changing the configuration of the latch lock 1 or the shape of each part at all, simply selecting the posture of the latch head 3 by turning it upside down, the mounting state of the latch lock 1 to the door D can be freely opened. It can be adapted. This makes it possible to realize the common use of parts without being affected by the opening of the door D, and to reduce the manufacturing cost.

Further, as described above, the latch play insertion hole 26 formed in the front plate 22 of the lock case 2 is formed in a size that allows the latch head 3 to come out. Therefore, the operation of flipping the latch head 3 up and down is performed by removing the lock face plate 4 from the front plate 22 of the lock case 2, pulling out the latch head 3 forward from the latch play insertion hole 26, turning it over, and re-entering the latch play insertion hole 26 Therefore, even after the latch lock 1 is attached to the door D, the opening of the door D can be changed as necessary even after the latch lock 1 is attached to the door D.

The latch head 3 has a spring receiving portion 3
6 is connected to a latch push-out spring 53 by a spring receiving pin 37 provided on the latch receiving portion 5.
It is fitted so as not to come out of the spring mounting portion 55 provided on the rear plate 54. Therefore, even when the lock face plate 4 is removed from the front plate 22, the latch head 3 and the latch pushing spring 53 are removed.
Does not fly forward, and parts are prevented from being lost.

In the above-described embodiment, the ridges 38 provided on the upper and lower surfaces of the latch head 3 are provided.
It is formed just in the middle between the front door-opening side surface 31 and the rear door-closing side surface 34 so as to be parallel to the two side surfaces, but these ridges 38, 38 are provided as long as they can be turned upside down. It does not necessarily have to be in the middle between the two side surfaces. For example, the guide groove 63 provided on the latch pressing plate 61 is formed eccentric to one side, and the ridges 38 of the latch head 3 are also formed eccentric to the upper and lower sides correspondingly. May be. That is, when the latch head 3 is viewed from the front of the lock case 2, the upper and lower ridges 38, 38 may be formed so as to be symmetrical about the center of the front shape thereof.

The latch lock 1 of the present invention enables the door D to be opened and closed by such a configuration and operation.
A locking / unlocking mechanism 9 is also provided so that the door D can be locked from one side.

As shown in FIGS. 1 and 7, the locking / unlocking mechanism 9 is housed near the lower portion of the lock case 2 and has a latch stopper 91 for preventing the latch head 3 from retreating.
The lock lever 92 includes a lock lever 92 and a lock return spring 93 for engaging and disengaging the lock lever, and a thumb-turn connector 94 for operating the lock lever 92.

The latch stopper 91 is a metal elongated plate-like or rod-like part, and is held vertically movable in a state of being sandwiched in the partition member 81 below the latch housing 5. . Then, the bottom plate 51 of the latch housing 5
The upper portion of the latch head 3 is inserted into the latch housing portion 5 through the latch stopper access hole 56 provided at the first portion and is projected to the rear side of the latch head 3 to prevent the latch head 3 from retreating.

The raising and lowering of the latch stopper 91 is performed by the rotation of the lock lever 92. Lock lever 92
Is a lever-shaped resin component, which is rotatably supported in the vicinity of the lower center of the lock case 2. The front part of the lock lever 92 is engaged with the lower part of the latch stopper 91, and the rear part is in contact with the thumb-turn connector 94. A lock return spring 93 composed of a torsion coil spring is fitted on the pivotal support portion of the lock lever 92, and its two arms are provided with a spring retaining projection 92 a provided on the front side surface of the lock lever 92, and a lock. It is sandwiched between the partition member 81 above the lever 92. Thereby, the lock lever 92
Are biased counterclockwise in FIG. 1, that is, in the unlocking direction.

At the rear end of the lock lever 92, a thumb-turn connector 94 rotatably supported above is in contact with the lock lever 92 from above. The thumb-turn connector 94 is a cam-shaped metal part, and has a locking projection 94a formed on a part of its peripheral surface. When the thumb-turn connector 94 is rotated approximately 90 degrees counterclockwise in FIG. 1, the locking projection 94 a pushes down the rear part of the lock lever 92. In addition, the Samtern connector 9
Further, two positioning projections 94b, 9
4c are formed, and these are brought into contact with the claw pieces 83 provided on the partition member 81 to determine the rotation position of the thumb-turn connector 94 during unlocking and locking. A square hole 94d is formed in the center of the thumb turn connector 94, and a square core (not shown) is inserted therein. This square core is connected to a locking / unlocking thumb turn (not shown) provided on either one of the inside and outside of the door D, and by twisting the thumb turn, the thumb turn connector 94 rotates.

When the lock lever 92 rotates with the rotation of the thumb-turn connector 94, the latch stopper 91 projects into and out of the latch accommodating portion 5 in conjunction with the rotation, so that the retraction of the latch head 3 is prevented. , It becomes possible again. In this manner, the locking and unlocking of the latch lock 1 is performed. Since the structure of the locking and unlocking mechanism 9 is simple and compact, it is easily accommodated in the lower part of the lock case 2 and the size of the latch lock 1 itself can be prevented.

Incidentally, the latch lock 1 shown in the above embodiment is a part of the latch head 3, the latch holding plate 61, the latch stopper 91, the thumb turn connecting body 94, etc., where stress tends to concentrate at the time of opening and closing the door or at the time of unlocking and unlocking. In addition to the above-mentioned parts, the springs of each part and the lock case 2 being made of metal, resin parts are frequently used. As a result, the entire latch lock 1 is reduced in weight, the manufacturing cost is reduced, and the operating noise of each part at the time of opening and closing the door and at the time of locking and unlocking is also reduced.

[0050]

According to the latch lock of the present invention, the ridges engageable with the latch guide are formed on the upper surface and the lower surface of the latch head, respectively, so that the door can be opened inside or outside (or left and right). In either case, the latch head can be turned upside down and adapted, and the parts can be shared regardless of the door opening.

In addition to the latching / unlocking mechanism, a locking / unlocking mechanism for preventing the retraction of the latch head by projecting a latch stopper at the rear of the latch head is incorporated in the lock case, thereby enabling the door to be unlocked / unlocked. Become.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which the internal structure of a latch lock according to the present invention is viewed from a side by a partial cross-sectional view.

FIG. 2 is a partially cutaway perspective view showing a configuration of main components housed in a substantially upper half of the latch lock.

FIG. 3 is a schematic cross-sectional view showing an opening / closing direction of a door provided with the latch lock and an engagement state with a door frame.

FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1, showing the configuration of the vicinity of the lifting / lowering body of the latch guide.

FIG. 5 is a schematic cross-sectional view showing the movement of the latch head when the door is closed.

FIG. 6 is a schematic cross-sectional view showing the movement of the latch head when the door is opened.

FIG. 7 is a partially cutaway perspective view showing a configuration of a locking / unlocking mechanism housed in a substantially lower half of the latch lock.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Latch lock 2 Lock case 26 Latch play insertion hole 3 Latch head 38 Ridge part 4 Lock face plate 41 Latch access hole 5 Latch accommodating part 53 Latch push-out spring 6 Latch guide 7 Latch hook removal mechanism 71 Up / down lever 72 Push-up slider 74 Push-down slider 76 Rotating body 9 Locking / unlocking mechanism 91 Latch stopper 92 Lock lever 94 Thumb turn connecting body 94a Locking projection D Door

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-47-42000 (JP, A) JP-A 47-32797 (JP, U) JP-A 49-78397 (JP, U) JP-A 50-50 19898 (JP, U) Japanese Utility Model Hei 4-92971 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E05B 15/10 E05C 1/16

Claims (5)

(57) [Claims] 1. A latch head having a substantially rhombic shape in plan view, and a latch receiving portion for receiving the latch head so that a front portion thereof can enter and exit from a front surface of a lock case, and for urging the latch head in a protruding direction via a latch pushing spring. A latch guide which is constantly urged and engaged with the upper surface of the latch head and guides the latch head in and out, while preventing the latch head from reversing;
A latch release mechanism for disengaging the latch guide from the latch head in conjunction with the door handle or switch.When the door is closed, the latch head is retracted into the latch housing while being guided by the latch guide, and the door is closed. When the door is closed, the latch guide is disengaged from the latch head by the operation of the latching / unlocking mechanism, and the latch head itself is turned in the horizontal direction by the door opening force and is opened while retracting. Protrusions that can be engaged with the latch guide are formed on the upper surface and the lower surface, respectively, and by flipping the latch head up and down according to the opening of the door, the posture of the latch head is adapted to the opening of the door. Characteristic latch lock. 2. A front face of a lock case is formed with a latch play insertion hole through which a latch head can be inserted and removed, and a lock face plate having substantially the same shape as the front face is removably overlapped. 2. A latch lock according to claim 1, wherein a latch entrance / exit hole is formed which interferes with protrusions formed on an upper surface and a lower surface of the head to prevent the latch head from coming out. 3. The latch lock according to claim 1, wherein the latch push-out spring has a front end and a rear end connected to the latch head and the latch housing, respectively. 4. The latching / unlocking mechanism is at least pushed down by an up / down lever which moves up and down in conjunction with a handle attached to the inside and outside of the door, a push up slider which is pushed up by the up / down lever to lift the latch guide, and a down / up lever. 2. A push slider, and a rotating body rotatably supported between the push slider and the latch guide, the swing body being rotated in conjunction with the lowering of the push slider, and pushing up the latch guide. 4. A latch lock according to claim 3. 5. A latch stopper protruding from below into the latch accommodating portion to prevent retraction of the latch head, one end of which is engaged with the latch stopper and is rotatably supported below the latch accommodating portion so as to be rotatable. , A pivotable lock lever that causes the latch stopper to protrude and retract into the latch receiving portion by the rotation, and a pivot that is connected to a thumb turn provided on either the inside or outside of the door while being in contact with the other end of the lock lever. And a cam-shaped thumb-turn coupling body for pivoting the lock lever by a locking projection formed on a part of the peripheral surface. The latch lock according to any one of claims 1 to 4, wherein