JP3929059B2 - Unlocking position restraint type latch device - Google Patents

Description

The present invention relates to a latch device that locks a door against a fixed frame body such as an electric equipment storage box.

In the conventional latch device that locks the door to the fixed frame body, a latch bolt is slidably accommodated in a case fixed to the door side, a lock hole is provided on the fixed frame body side, and the lock hole is engaged. The latch bolt is slid and biased by a spring in the direction, and by rotating the lever handle or knob from the front side of the door, the latch bolt is moved backward to the unlocked position. This is performed in a state where the latch bolt is constrained to the unlocked position.

When the height of the door is large, it is necessary to lock the door at several places. Until the last latch device is unlocked, all of the multiple latch devices that have been unlocked so far It is practically impossible for one person to place the latch bolt in the unlocked position by placing the hand on the lever handle or knob.

In order to improve the inconvenience in use, there has been proposed an unlocking position restraint type latch device that can restrain and hold the latch bolt at the unlocking position by a simple operation (for example, Patent Document 1).
reference).
However, in this latch device, the operation part of the lock lever for retracting and sliding the latch bolt to the unlocked position is projected on the front side of the case, so that a part of the body of the passerby and other objects When a part contacts the operation part, the lock lever is unintentionally driven, the latch bolt slides backward, and the locking of the door may be accidentally released.

In addition, even if someone other than the authorized person unlocks the latch device and opens the door, and even if any unauthorized operation is performed on the internal electrical equipment, the door is closed again and the latch bolt is locked. When you leave the position and leave, you cannot detect the unauthorized work early.

Japanese Patent No. 2623230

The problem to be solved by the present invention is to provide a stopper that can prevent unintentional backward sliding of the latch bolt when the latch bolt is in the locked position.
Unlocking position restraint type latch that can accurately move and release the movement of the latch bolt with a par.
Providing a device.

The main feature of the present invention accommodates a latch bolt 6 into the case 2 which is fixed to the door 1, the latch bolt 6 biased slide by a spring 3 in a direction to engage the locking holes 5 of the fixing frame 4 side And before
The lock lever 8 accommodating the separation grooves 7 of the serial latch bolt 6 is supported on retractable rotatably the latch bolt 6, with rotation by the spring 3 the locking lever 8 in the direction in which the tip is retracted into the separation grooves 7 was energized, the operation unit 11 provided on the locking lever 8, when the latch bolt 6 is retracted slide in unlocked position, those the tip surface 8a of the locking lever 8 in the hole edge portion 5a of the lock hole 5 It is configured to contact, housed in the cavity 41 of the stopper 40 to be moved in the transverse direction of the case 2 case 2 for restricting the backward movement of the latch bolt 6, of the La <br/> Tchiboruto 6 the stopper <br/> par 40 an elastic member by engaging the unlocking position restraining latch device odor which is adapted to hold at a position and a position releasing the該制stop arresting backward movement
And
A pair of elastic members in which the elastic member is integrally formed on the base end surface of the stopper 40 made of plastic.
The free end of the elastic arm 42 is an inner wall surface 48 of the hollow portion 41.
And is brought into pressure contact with the inner bottom surface of the guide groove 58 by being engaged with the guide groove 58 formed in
A long relief groove 43 in the sliding direction of the latch bolt 6 is formed on the front side of the base end of the latch bolt 6.
And the stopper 40 contacts one inner wall surface in the transverse direction of the cavity 41 of the case 2.
When the movement restriction release position that comes into contact is reached, the restraining projection 44 that faces the escape groove 43 is inserted into the strut.
A stopper 40 is formed on the back side of the hopper 40, and the stopper 40 is located beside the cavity 41 of the case 2.
When the movement restricting position comes into contact with the other inner wall surface in the cutting direction, the stopping protrusion of the stopper 40
The flange 44 faces the base end face 45 of the latch bolt 6 adjacent to the escape groove 43 so that the
While stopping the reverse slide of the bolt 6,
An operation window hole 46 is formed in the front wall portion of the cavity 41 of the case 1, and the stopper 40
Is present in the operation window hole 46 regardless of the movement restriction position or the movement restriction release position.
A groove-shaped operation receiving portion 47 is formed on the front side of the stopper 40, and the operation window hole 46 is passed through.
Then, the operation member is inserted into the operation receiving portion 47 and the stopper 40 is moved to the elastic arm 42.
It slides against the holding force,
The front side of the stopper 40 has a front side when the stopper 40 is in the movement restriction position.
A red circular recess 59 located in the operation window hole 46 is formed on one side of the operation receiving portion 47.
On the other hand, when the stopper 40 is in the movement restriction release position, it is located in the operation window hole 46.
The blue circular recess 60 is formed on the other side of the operation receiving portion 47 .

In the unlocking position restraint type latch device of the present invention, when the door 1 is opened, the latch bolt 6 protrudes from the case 2 at the tip, and the tip of the lock lever 8 is stored in the split groove 7 of the latch bolt 6. Has been. In the cavity 41 of the case 2, there is a strike that restricts the backward movement of the latch bolt 6.
The stopper 40 is accommodated, and the stopper 40 is exchanged with the moving direction of the latch bolt bolt 6.
The backward movement of the latch bolt 6 is restrained or released so as to advance or retreat in the direction to be inserted.
Therefore, the operation part 11 of the lock lever 8 is arranged to protrude from the front side of the case 2
However, when a part of a passer's body or other object comes into contact with the operation unit, it is unintentionally locked.
When the clever 8 is driven, the latch bolt 6 slides backward, and the door 1 is locked to the fixed frame 4.
Will not be released accidentally.
When the door 1 is rotated in the closing direction from the door open state , the latch bolt 6
Is in contact with the opening edge 4a of the fixed frame 4 or the guide plate fixed to the opening edge 4a on the cam slope 12 at the tip. When the closing rotation of the door 1 is further continued, the latch bolt 6 pressed against the cam slope 12 by the opening edge 4a or the guide plate once retracts into the case 2 against the bias of the spring 3.

At the moment when the door 1 is rotated to the fully closed position, the latch bolt 6 is moved to the case 2 by the sliding bias of the spring 3.
The door 1 is locked to the fixed frame 4 by engaging with the lock hole 5 of the fixed frame 4 as shown in FIG. In this locking position, the lock lever 8 is kept in the state where the distal end portion is stored in the split groove 7 of the latch bolt 6 by the rotation bias of the spring 3.

In order to unlock the door 1, as shown in FIG. 6, the latch bolt 6 is attached together with the lock lever 8 together with the spring 3 by pulling a finger on the tip rib 55 of the operation unit 11 sideways. The front end of the latch bolt 6 is made to escape from the lock hole 5 of the fixed frame 4 by sliding backward against the force. At the end of the backward operation of the latch bolt 6, when the operation portion 11 is pushed obliquely and the lock lever 8 is rotated, the tip end portion of the lock lever 8 protrudes from the split groove 7 of the latch bolt 6.

When the force of the fingertip is weakened while maintaining this protruding state, the latch bolt 6 moves slightly forward by the bias of the spring 3, so that the front end surface 8 a of the lock lever 8 is the hole edge 5 of the lock hole 5 of the fixed frame 4.
a. By this contact, the latch bolt 6 is held at a position where the tip portion does not re-engage with the lock hole 5, that is, an unlocked position.

When a plurality of latch devices are used for the door 1, the latch bolts 6 of the respective latch devices are sequentially restrained in this manner, and this restrained state is maintained until the last latch device is unlocked and the door 1 is opened. Is secured. When the door 1 is opened by putting the fingertip on the tip rib 54 of the finger hook portion 53 of the case 2 and the tip rib 55 of the operation portion 11 of the lock lever 8, the latch bolt 6 is instantaneously moved forward by the biasing of the spring 3. The part protrudes from the case. Further, the lock lever 8 is returned and rotated by the same spring 3 urging, and the tip portion is immersed in the split groove 7 of the latch bolt 6.

When the latch bolt 16 is in the locked position, the unlocking position restraint type latch device of the present invention
Plastic stopper 4 for accurately preventing unintentional backward sliding of the bolt 16
And a pair of bullets on the base end surface of the stopper 40 housed in the cavity 41 of the case 2.
The elastic arm 42 is integrally formed, and the free end of the elastic arm 42 is formed on the inner wall surface 48 of the cavity portion 41.
Engaged with the guide groove 58 and pressed against the inner bottom surface of the guide groove 58.
A long relief groove 43 is formed in the sliding direction on the front side of the base end portion of the latch bolt 6, and the stopper 40 is
When the movement restriction release position comes into contact with one inner wall surface in the transverse direction of the hollow portion 41, the clearance is released.
A stop projection 44 facing the groove 43 is formed on the back side of the stopper 40 so that the stopper 40
When the movement restricting position comes into contact with the other inner wall surface of the hollow portion 41 in the transverse direction,
The latch bolt 6 is made to face the base end face 45 of the latch bolt 6 adjacent to the relief groove 43.
While stopping the backward sliding of
An operation window hole 46 is formed in the front wall portion of the hollow portion 41, and the stopper 40 is in the movement restricting position.
And a groove-shaped operation receiving portion 47 that appears in the operation window hole 46 at any of the movement restriction release positions.
Is formed on the front side of the stopper 40, and further on the front side of the stopper 40
When the -40 is in the movement restriction position, the red circular recess 59 located in the operation window hole 46 is manipulated.
It is formed on one side of the receiving part 47, while it is operated when the stopper 40 is in the movement restriction release position.
Since the blue circular recess 60 located in the window making hole 46 is formed on the other side of the operation receiving portion 47,
The movement restriction of the latch bolt 16 by the stopper 40 and the release of the movement restriction can be accurately performed.

In the illustrated embodiment, the leading end portion of the latch bolt 6 provided with the cam slope 12 protrudes and appears from the opening portion 14 of the left side wall portion 13 of the box-shaped case 2. The spring 3 that is used for both the sliding bias of the latch bolt 6 and the rotational bias of the lock lever 8 is constituted by a compression coil spring, and one end of the spring 3 is a truncated cone spring on the right side of the base end of the lock lever 8. The other end of the spring 3 is fitted to the spring receiving part 10 having a substantially truncated cone shape on the right side wall part 16 of the case 2. A plate-like operation portion 11 formed integrally with the lock lever 8 protrudes from a guide slot 18 of the front wall portion 17 of the case 2.

A shaft portion 21 having a semicircular cross section is provided on the upper and lower side surfaces of the base end portion of the lock lever 8 so as to protrude from the operation portion 11. A bearing groove 22 having a U-shaped cross section is provided on the front surface of the intermediate portion of the latch bolt 6 so as to be positioned in front of the bottom surface 7 a of the receiving groove 7. Since the shaft portion 21 of the lock lever 8 is fitted in the bearing groove 22, the lock lever 8 moves forward and backward integrally with the latch bolt 6 and is supported rotatably with respect to the latch bolt 6. .

Stop protrusions 23 having a circular arc cross section project from the upper and lower side surfaces of the intermediate portion of the operation portion 11, and each stop protrusion 23 engages with an inner shoulder 25 of the wall portion 24 of the case 2, thereby The shaft portion 21 is prevented from escaping from the bearing groove 22 of the latch bolt 6.

As shown in FIG. 7, when the tip of the lock lever 8 is immersed in the split groove 7 of the latch bolt 6, the point of application of the spring receiving portion 9 on the lock lever 8 side is the same as that of the spring receiving portion 10 on the case 2 side. Since it is located on the front side with respect to a straight line connecting the point of application force and the center of the shaft portion 21 of the lock lever 8, the rotational urging force by the elastic force of the spring 3 is the direction in which the tip portion of the lock lever 8 is maintained to be immersed. Working.

As shown in FIG. 8, when the tip of the lock lever 8 protrudes from the split groove 7 of the latch bolt 6, the point of application of the spring receiving part 9 on the lock lever 8 side is the force of the spring receiving part 10 on the case 2 side. Since it is located on the straight line connecting the point and the center of the shaft portion 21 of the lock lever 8 or is located on the rear surface side with respect to the straight line, the rotational urging force by the elastic force of the spring 3 is applied to the tip of the lock lever 8. Working in the direction of maintaining the protruding state. In this projecting state, the front end portion of the lock lever 8 is in contact with the rear surface of the front wall portion 17 a that is retracted by one step in the case 2.

That is, the spring 3 functions as a spring of a so-called dead point mechanism, and slidably biases the latch bolt 6 in the protruding direction, and the lock lever 8 corresponds to the movement of the applied force point.
Is urged to rotate in the immersion direction or the protruding direction. The spring 3 is inserted into the through hole 37 of the latch bolt 6.

In the above-described embodiment, the case 2 is plastic-molded in a half-split state, and one half 2a and the other half 2b are connected by a connecting band plate portion 15 on the back side. On one joining end face of the upper half 2a and the lower half 2b, a joining recess 28 is formed at a position farthest from the connecting band plate portion 15, and a joining projection 29 is formed at the same position on the other half. The upper half a and the lower half 2 b that are bent and closed by the connecting band plate portion 15 are held in a closed state by the engagement of the bonding recess 28 and the protrusion 29.

The spring receiving part 10 on the case 2 side is also divided into two parts. A guide groove 30 is formed on the side surface of the latch bolt 6, and a guide protrusion 31 that engages with the guide groove 30 is provided in the left and right directions on the wall portion 24 and the wall portion 26 of the case 2.
An attachment plate portion 32 that is inclined upward toward the front surface is provided at the intermediate portion between the wall portion 24 and the wall portion 26 of the case 2.
The mounting plate portion 33 is cut and raised, and stepped locking projections 34 and 35 are provided at the tip portions of the mounting plate portions 32 and 33, respectively. When the case 2 is inserted into the receiving hole 36 of the door 1 from the front side,
The upper and lower mounting plate portions 32 and 33 are slightly elastically deformed inward with the root portion on the rear end side as the center, and when the front wall portion 17 of the case 2 comes into contact with the front surface of the door 1, the mounting plate portions 32 and 33 are The elastic projections are restored, and the locking projections 34 and 35 at the front end engage with the rear surface of the door 1 to prevent the case 2 from being pulled out.

In the above embodiment, the stopper 40 has a plastic flat plate shape, and a guide groove 56 is formed on the side surface portion on the distal end side. A guide protrusion 57 that engages with the guide groove 56 is formed on the inner wall surface of the cavity 41 of the case 2 that faces the inner wall surface 48. Stopper 40
The pair of elastic arms integrally formed on the base end surface constitutes an elastic member 42 for stopping and holding the stopper 40 in a fixed position, and the elastic arm 42 is a guide groove 58 formed on the inner wall surface 48. It is inserted in. Therefore, the stopper 40 does not move in both the front direction and the back direction, and slides only in the direction perpendicular to the forward / backward direction of the lock bolt 6. The base end surface 40 a of the stopper 40 is in contact with the inner wall surface 48 of the cavity 41.

Two relief grooves 43 projecting from the front side of the base end portion of the rock-balt bolt 6 are formed in parallel to the moving direction of the lock bolt 6 and correspondingly formed on the back side of the stopper 40. Two stop projections 44 are also arranged in parallel. As shown in FIG. 11, when the end face of the restraining projection 44 abuts on the base end face 45 of the lock bolt 6, the lock bolt 6 is prevented from sliding backward.

When the stopper 40 is slid against the holding force of the elastic member 42 until the stop projection 44 faces the escape groove 43, the lock bolt 6 is set in a state in which it can slide backward.
When the stopper 40 is in the movement restricting position of the lock bolt 6, the circular concave portion 59 with the red color on the upper surface of the stopper is located in the operation window hole 46. On the contrary, when the stopper 40 is in a position where the movement restriction of the lock bolt 6 is released, the circular concave portion 60 with the blue color on the upper surface of the stopper is located in the operation window hole 46.

As the operation member of the stopper 40, the tip of the driver is appropriately selected, and the stopper 4
A groove-shaped operation receiving portion 47 is provided on the upper surface portion of 0 at the intermediate position between the circular recesses 59 and 60. The operation receiving portion 47 appears in the operation window hole 46 regardless of whether the stopper 40 is in the position of movement restriction or restriction release.

The through hole 50 of the raised portion 49 formed in the front collar of the case 2 and the operation portion 11 of the lock lever 8
Since the sealing member 52 is inserted into the through hole 51, the lock bolt 6 is moved backward.
In order to unlock the door 1, the sealing member 52 can be broken and the lock lever 8 can be operated.
Must be in a state. Therefore, by observing the situation of this sealing member 52
, Can determine the presence or absence of unauthorized work on internal devices, etc.
Necessary countermeasures can be taken accurately. The raised portion 49 to which the sealing member 52 is applied is
It is formed on one side of the guide slot 18.
The finger hook portion 53 protruding from the front of the base end portion of the case 2 protrudes from a portion adjacent to the operation window hole 46. A tip rib 54 that warps outward of the operation portion 11 of the lock lever 8, and a finger hook portion 53.
The tip rib 55 that has warped outward is formed in a plurality of wave shapes so as to increase the friction with the fingertip, and the opening operation of the door 1 subsequent to the rotation operation of the lock lever 8 sufficiently exerts a gripping force.
It is done easily.

It is a front view of the state which performed the movement regulation of the latch bolt in the unlocking position restraint type latch device concerning one example of the present invention. It is a front view of the state which canceled the movement restriction | limiting of the latch bolt in the latch apparatus of FIG. It is a bottom view of the latch device of FIG. It is a right view of the latch apparatus of FIG. It is a bottom view of the locked state of the latch apparatus of FIG. It is a bottom view of the unlocking state of the latch device of FIG. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2. It is CC sectional view taken on the line of FIG. 1, and a stopper exists in the position which regulates a latch bolt. FIG. 3 is a cross-sectional view taken along the line DD of FIG. 2, and the stopper is in a position where the movement restriction of the latch bolt is released. It is a top view which shows the relationship position of a latch bolt and a stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door 2 Case 3 Energizing spring 4 of a latch bolt and a lock lever 4 Fixed frame 5 Lock hole 5a on the fixed frame side Hole edge 5b of the lock hole of the fixed frame body Inner wall surface 6 of the lock hole of the fixed frame 6 Latch bolt 7 Latch bolt split groove 8 Lock lever 8a Lock lever tip 9 Lock lever side spring receiving portion 10 Case side spring receiving portion 11 Lock lever operating portion 12 Latch bolt cam slope 21 Lock lever shaft 22 Latch Bolt bearing groove 23 Lock lever stop projection 40 Stopper 41 Cavity 42 Elastic member 43 Escape groove 44 Stop projection 45 Latch bolt base end surface 46 Operation window hole 47 Operation receiving portion 48 Cavity inner wall 49 Case bulge 50 Through-hole 51 in the raised portion 51 through-hole 52 in the operation portion Sealing member 53 Finger-hook portion 54 Tip rib 55 in the handle portion Tip rib in the finger-hook portion

Claims (1)

Accommodating the latch bolt 6 into the case 2 which is fixed to the door 1, the latch bolt 6 biases slide by a spring 3 in a direction to engage the locking holes 5 of the fixing frame 4 side, of the latch bolt 6 the lock lever 8 accommodating the split groove 7 is retractable rotatably supported on the latch bolt 6, rotationally urged the lock <br/> clever 8 tip by the spring 3 in the direction retracts the split groove 7 and, wherein <br/> the operating portion 11 provided on the locking lever 8, wherein when the latch bolt 6 is retracted slide in unlocked position, the hole edge of the lock hole 5 a front end face 8a of the locking lever 8 so as to abut against the 5a
Configured, housed in the cavity 41 of the stopper 40 to be moved in the transverse direction of the case 2 case 2 for restricting the backward movement of the latch bolt 6, the position and the arresting backward movement of the latch bolt 6 in the unlocking position restraining latch apparatus that the stopper 40 to lock held by an elastic member in releasing the stop position,
A pair of elastic members in which the elastic member is integrally formed on the base end surface of the stopper 40 made of plastic.
The free end of the elastic arm 42 is an inner wall surface 48 of the hollow portion 41.
And is brought into pressure contact with the inner bottom surface of the guide groove 58 by being engaged with the guide groove 58 formed in
A long relief groove 43 in the sliding direction of the latch bolt 6 is formed on the front side of the base end of the latch bolt 6.
And the stopper 40 contacts one inner wall surface in the transverse direction of the cavity 41 of the case 2.
When the movement restriction release position that comes into contact is reached, the restraining projection 44 that faces the escape groove 43 is inserted into the strut.
A stopper 40 is formed on the back side of the hopper 40, and the stopper 40 is located beside the cavity 41 of the case 2.
When the movement restricting position comes into contact with the other inner wall surface in the cutting direction, the stopping protrusion of the stopper 40
The flange 44 faces the base end face 45 of the latch bolt 6 adjacent to the escape groove 43 so that the
While stopping the reverse slide of the bolt 6,
An operation window hole 46 is formed in the front wall portion of the cavity 41 of the case 1, and the stopper 40
Is present in the operation window hole 46 regardless of the movement restriction position or the movement restriction release position.
A groove-shaped operation receiving portion 47 is formed on the front side of the stopper 40, and the operation window hole 46 is passed through.
Then, the operation member is inserted into the operation receiving portion 47 and the stopper 40 is moved to the elastic arm 42.
It slides against the holding force,
The front side of the stopper 40 has a front side when the stopper 40 is in the movement restriction position.
A red circular recess 59 located in the operation window hole 46 is formed on one side of the operation receiving portion 47.
On the other hand, when the stopper 40 is in the movement restriction release position, it is located in the operation window hole 46.
An unlocking position constraining type latch device characterized in that a blue circular recess 60 is formed on the other side of the operation receiving portion 47 .

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