JP3040325U - Unlocking position restricted type latch device - Google Patents

Abstract

(57) Abstract: To provide a latch device capable of restraining a latch bolt in an unlocked position by a simple operation. A lock lever (8) housed in a split groove (7) of a latch bolt (6) is rotatably supported by a latch bolt (6), and the lock lever (8) is inserted or projected from a split groove (7) in a direction in which the lock lever (8) is inserted or projected. When the latch bolt 6 is provided with an operating portion 11 by being urged to rotate by the spring 3 and the latch bolt 6 is slid back to the unlocked position, the tip surface 8a of the lock lever 8 protruding from the split groove 7 is locked in the lock hole. 5 is brought into contact with the hole edge portion 5a.

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch device that locks a door with respect to a fixed frame body such as an electrical equipment storage box.

[0002]

2. Description of the Related Art In a conventional latch device that locks a door with respect to a fixed frame, a latch bolt is slidably housed in a case fixed to the door side and a lock hole is provided on the fixed frame side. The latch bolt is slidingly biased by the spring in the direction to engage with the hole.By rotating the lever handle or knob from the front side of the door, the latch bolt is slid backward to the unlocked position, The unlocking operation is performed with the latch bolt held in the unlocked position.

When the height of the door is large, it is necessary to lock the door at several points. However, until the last latch device is unlocked, a plurality of latches that have been unlocked by that time are operated. It is virtually impossible for one person to hold the latch bolt in the unlocked position by holding the lever handle or knob on the entire device.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a latch device having a simplified spring structure and capable of restraining a latch bolt in an unlocked position by a simple operation.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] Hereinafter, referring to the reference numerals in the accompanying drawings, in an unlocking position restraint type latch device of the present invention, a latch bolt 6 is housed in a case 2 fixed to a door 1. , The latch bolt 6 is slidably biased by the spring 3 in the direction of engaging with the lock hole 5 on the fixed frame body 4 side, and the lock lever 8 housed in the split groove 7 of the latch bolt 6 is retractable so that the latch bolt 6 can rotate. The lock lever 8 is rotatably biased by the spring 3 in the direction in which the tip end is recessed in the split groove 7, the lock lever 8 is provided with an operating portion 11, and the latch bolt 6 is slid backward to the unlocked position. At this time, the tip surface 8a of the lock lever 8 is brought into contact with the hole edge portion 5a of the lock hole 5.

When the door 1 is open, the tip of the latch bolt 6 projects from the case 2, and the tip of the lock lever 8 is housed in the split groove 7 of the latch bolt 6. When the door 1 is rotated in the closing direction in this state, the latch bolt 6 is fixed to the opening edge 4a of the fixed frame body 4 or the opening edge 4a of the fixed frame body 4 at the cam slope 12 at the tip of the rotation end. Abut. 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 portion 4a or the guide plate retracts once inside the case 2 against the bias of the spring 3.

At the moment when the door 1 rotates to the fully closed position, the latch bolt 6 projects from the case 2 by the sliding bias of the spring 3 and engages with the lock hole 5 of the fixed frame body 4 as shown in FIG. Then, the door 1 is locked to the fixed frame body 4. In this locked position, the tip of the lock lever 8 is retained in the split groove 7 of the latch bolt 6 by the rotational bias of the spring 3.

In order to unlock and open the door 1, by pulling a finger hung on the operating portion 11 of the lock lever 8 sideways, the latch bolt 6 together with the lock lever 8 is resisted against the bias of the spring 3. Then, the latch bolt 6 is slid backwards and the tip portion of the latch bolt 6 is pulled out from the lock hole 5 of the fixed frame body 4. At the end of the backward operation of the latch bolt 6, when the operating portion 11 is pushed down obliquely and the lock lever 8 is rotated, the tip portion of the lock lever 8 projects 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 advances slightly due to the urging force of the spring 3, so that the tip surface 8a of the lock lever 8 is fixed to the fixed frame body as shown in FIG. 4 abuts on the hole edge portion 5a of the lock hole 5. By this abutment, the latch bolt 6 is held at the position where the tip end thereof does not re-engage with the lock hole 5, that is, the unlocked position.

When a plurality of latch devices are used for the door 1, the latch bolts 6 of each latch device are sequentially restrained in this way, until the last latch device is unlocked and the door 1 is opened. , This restrained state is secured. When the door 1 is opened, the latch bolt 6 is instantly advanced by the urging force of the spring 3, and the tip end portion projects from the case. Further, the lock lever 8 is returned and rotated by the same biasing force of the spring 3, and the tip end thereof is set in the split groove 7 of the latch bolt 6.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiment shown in FIGS. 1 to 11, the tip of a latch bolt 6 provided with a cam slope 12 protrudes and retracts from an opening 14 of a left side wall 13 of a box-shaped case 2. . The spring 3 which is used for both the biasing of the latch bolt 6 for sliding and the biasing of the rotation of the lock lever 8 is composed of a compression coil spring, and one end of the spring 3 has a truncated cone shape on the right side surface of the base end of the lock lever 8. The spring 3 is fitted in the receiving portion 9, and the other end of the spring 3 is fitted in the substantially frustoconical spring receiving portion 10 of the right side wall portion 16 of the case 2. A plate-shaped operating portion 11 integrally formed with the lock lever 8 projects from the 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 extension of the operation portion 11. A bearing groove 22 having a U-shaped cross section is provided on the front surface of the middle portion of the latch bolt 6 so as to be located 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 back and forth integrally with the latch bolt 6 and is rotatably supported by the latch bolt 6. There is.

Stop projections 23 having an arcuate cross-section are provided on upper and lower side surfaces of an intermediate portion of the operation portion 11, and each of the stop projections 23 includes an inner surface shoulder portion 25 of an upper surface wall portion 24 and a lower surface wall portion 26 of the case 2. By engaging the inner surface shoulder portion 27, the shaft portion 21 of the lock lever 8 is prevented from coming out of the bearing groove 22 of the latch bolt 6.

As shown in FIG. 7, when the tip of the lock lever 8 is recessed in the split groove 7 of the latch bolt 6, the force receiving point of the spring receiving portion 9 on the lock lever 8 side is the spring receiving portion on the case 2 side. Since it is located on the front side with respect to the straight line connecting the force application point of the portion 10 and the center of the shaft portion 21 of the lock lever 8, the rotational bias due to the elastic force of the spring 3 causes the tip end portion of the lock lever 8 to be retracted. Working to maintain.

As shown in FIG. 11, when the tip of the lock lever 8 is projected from the split groove 7 of the latch bolt 6, the force receiving point of the spring receiving portion 9 on the lock lever 8 side is the belt receiving portion on the case 2 side. Since it is on the straight line connecting the force application point of the portion 10 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 bias due to the elastic force of the spring 3 causes the lock lever 8 to rotate. It works in the direction of maintaining the protruding state of the tip of the. In this protruding state, the front end of the lock lever 8 is in contact with the rear surface of the front wall portion 17a that is retracted by one step from the case 2.

That is, the spring 3 functions as a spring of a so-called dead point mechanism. The spring 3 urges the latch bolt 6 to slide in the protruding direction, and the lock lever 8 is retracted in response to the movement of the force application point. It is urged to rotate in the direction or the protruding direction. In order to control the posture of the spring 3 and to clarify the movement of the force application point of the spring 3 with respect to the lock lever 8, a protrusion 20 is provided in the vertical diametrical direction at the root of the spring receiving portion 9 on the lock lever 8 side. The end of the spring 3 rests on the ridge 20. The spring 3 is inserted into the through hole 37 of the latch bolt 6.

Unlike the present embodiment, even when the tip portion of the lock lever 8 projects from the split groove 7 of the latch bolt 6, the force receiving point of the spring receiving portion 9 on the lock lever 8 side is the case. When it is set so as to be on the front side with respect to the straight line connecting the force application point of the spring receiving portion 10 on the side of the lock lever 2 and the center of the shaft portion 21 of the lock lever 8, the rotational bias by the elastic force of the spring 3 is The tip end surface 8a of the lock lever 8 is engaged with the hole edge portion 5a of the fixed frame body 5 in this direction. The lock lever 8 does not rotate in the retracted direction because it is obstructed by 5a.

When the latch bolt 6 is advanced to the locking position, the operating portion 11 of the lock lever 8 that has been integrally advanced comes into contact with the left inner wall surface 18a of the guide slot 18 at the left side surface 11a, and The stopper shoulder portion 19 on the front end side abuts on the left side wall portion 13 of the case 2. When the latch bolt 6 is retracted to the unlocked position, the right side surface 11b of the operating portion 11 contacts the right inner wall surface 18b of the guide slot 18.

Although the operating portion 11 of the lock lever 8 is projected to the front side of the case 2 in the above-described embodiment, the guide slot 18 is retracted further than the front surface of the case 2 so that the operating portion 11 does not get in the way. By providing it, the operating portion 11 can be housed in the case 2 as shown in FIG.

In each of the above-described embodiments, the case is plastically molded in the upper half 2a and the lower half 2b in a half-divided state, and the upper half 2a and the lower half 2b are connected by the connecting strip plate portion 15 on the back surface. . A joining concave portion 28 is formed at a position farthest from the connecting strip plate portion 15 on one joining end surface of the upper half 2a and the lower half 2b, and a joining protrusion 29 is formed at the same position on the other. The upper half a and the lower half 2b, which are folded and closed by the connecting strip plate portion 15, are held in a closed state by the engagement of the joining concave portion 28 and the projection 29.

The spring receiving part 10 on the case 2 side is also divided into two parts, and when closed for the above, the spring receiving part 10a on the upper half 2a side and the spring receiving part 10b on the lower half 2b side. Is closed to have a substantially circular cross section, and the end of the compression coil spring 3 is fitted into this, so that the upper half 2a and the lower half 2b of the case 2 are prevented from separating. Guide grooves 30 are formed on the upper and lower side surfaces of the latch bolt 6, and guide ridges 31 that engage with the guide grooves 30 are provided on the upper surface wall 24 and the lower surface wall 26 of the case 2 in the left-right direction. .

A mounting plate portion 32 and a mounting plate portion 33 which are inclined upward toward the front surface are cut and raised at an intermediate portion between the upper surface wall portion 24 and the lower surface wall portion 26 of the case 2, and each mounting plate portion 32, Stepped locking projections 34 and 35 are provided at the tip of 33. 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 inwardly around the root portion on the rear end side, and the front wall portion of the case 2 is formed. When 17 is brought into contact with the front surface of the door 1, the mounting plate portions 32 and 33 are elastically restored, and the locking projections 34 and 35 at the tip end are engaged with the rear surface of the door 1 to prevent the case 2 from coming off. .

The top wall 24 and the bottom wall 26 of the case 2 are provided with pressing protrusions 38, 39 on both sides of the mounting plate parts 32, 33 in the front-rear direction. Guidance slopes 38a and 39b are provided at the rear part. The pressing projections 38 and 39 engage with the inner wall surface of the receiving hole 36 of the door 1, whereby the upper half 2a and the lower half 2b of the case 2 are more firmly held in the closed state.

[0024]

As described above, in the latch device of the present invention, the lock lever 8 housed in the split groove 7 of the latch bolt 6 is rotatably supported by the latch bolt 6, and the tip end of the lock lever 8 is split groove. When the lock lever 8 is rotated and urged by the spring 3 in the direction of immersing or projecting from 7, and the latch bolt 6 is provided with the operating portion 11 and the latch bolt 6 is slid backward to the unlocked position, it projects from the split groove 7. Since the front end surface 8a of the lock lever 8 is brought into contact with the hole edge portion 5a of the lock hole 5, the latch bolt 6 can be accurately restrained in the unlocked position, and when a plurality of latch devices are used in parallel. The unlocking and opening operation of the door can be easily performed by one person.

Further, in the present invention, since the sliding biasing spring of the latch bolt 6 and the rotation biasing spring of the lock lever 8 are composed of a single spring, the internal structure is simplified and the manufacturing assembly is improved. Easy and cheap to stand up.

[Brief description of the drawings]

FIG. 1 is a front view of an unlocking position restraint type latch device according to an embodiment of the present invention in a locked state.

FIG. 2 is a rear view of the latch device.

FIG. 3 is a plan view of the latch device.

FIG. 4 is a bottom view of the latch device.

FIG. 5 is a left side view of the latch device.

FIG. 6 is a right side view of the latch device.

FIG. 7 is a sectional view taken along line AA of FIG. 1;

FIG. 8 is a sectional view taken along the line BB of FIG. 1;

9 is a cross-sectional view taken along the line CC of FIG.

10 is a cross-sectional view taken along line DD of FIG.

FIG. 11 is a cross-sectional view of a state in which a latch bolt of the latch device is restrained in an unlocked position.

FIG. 12 is a sectional view of an unlocking position restraint type latch device according to another embodiment of the present invention.

[Explanation of symbols]

 1 Door 2 Case 3 Spring for Energizing Latch Bolt and Lock Lever 4 Fixed Frame Body 5 Lock Hole on Fixed Frame Body 5a Hole Edge of Lock Hole on Fixed Frame Body 5b Inner Wall Surface of Lock Hole on Fixed Frame Body 6 Latch Bolt 7 Latch bolt split groove 8 Lock lever 8a Lock lever tip surface 9 Lock lever side spring receiving part 10 Case side spring receiving part 11 Lock lever operating part 12 Latch bolt cam slope 21 Lock lever shaft part 22 Latch Bolt bearing groove 23 Lock lever stop protrusion

Claims (1)

[Utility model registration claims] 1. A latch bolt 6 is accommodated in a case 2 fixed to a door 1, and the latch bolt 6 is slidably biased by a spring 3 in a direction to engage with a lock hole 5 on a side of a fixed frame 4 to latch the latch bolt 6. The lock lever 8 housed in the split groove 7 of the bolt 6 is rotatably supported by the latch bolt 6, and the lock lever 8 is rotationally urged by the spring 3 in the direction in which the tip portion is recessed in the split groove 7. 8, an operating portion 11 is provided, and when the latch bolt 6 is slid back to the unlocked position, the tip end surface 8a of the lock lever 8 is brought into contact with the hole edge portion 5a of the lock hole 5 .