JPH0715967U - Locking device with latch bolt - Google Patents

Abstract

(57) [Summary] [Purpose] To enable the latch bolt that retracts and unlocks to maintain its retracted position. [Structure] A latch bolt 15 for advancing / retracting with respect to the fixed frame 4 for locking and unlocking is provided at a front portion 15A and a rear portion 15.
The front portion 15A is pivotally supported by the rear portion 15B, and the front portion 15A is pivotable inward of the door 3 under the action of the first biasing spring 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a locking device with a latch bolt for locking a door to a fixed frame.

[0002]

[Prior art]

 Conventionally, a locking device with a latch bolt for locking a door to a fixed frame is well known. With regard to this type of device, in Japanese Utility Model Laid-Open No. 2-103704, when a latch bolt in a locked state is moved backward by spring operation and is retracted by operating a knob, the latch bolt remains stopped at the retracted position, A mechanism capable of maintaining a locked state is disclosed. If this mechanism is used, it is not necessary to manually hold the latch bolt in the unlocked state, so that it is possible to open the door even if multiple locking devices are used on a large door. No hassle.

[0003]

[Problems to be solved by the device]

 In the known locking device, one end of the rod-shaped engaging element provided on the door is pressed against the step portion provided on the fixed frame to compress the biasing spring of the engaging element, and the other end of the engaging element and the retracted latch bolt. When the recesses are aligned, they are engaged with each other to prevent the latch bolts from advancing. Therefore, in order to use this locking device, it is necessary to provide the fixing frame with at least a portion to be engaged with the advanced latch bolt and the step portion.

By the way, it is generally desired that the locking device has a mechanism that is as simple as possible according to the usage conditions. This is because if the operating mechanism and mounting mechanism are simplified, the number of parts will be reduced, the manufacturing cost will be reduced, maintenance and mounting will not be troublesome, and there will be great advantages for manufacturers and users.

Therefore, in this invention, the latch bolt is divided into front and rear parts, and the front part can be rotated by a required angle with respect to the rear part, so that the step part of the fixed frame which is indispensable to the known locking device is unnecessary. The challenge is to meet the general demand for simplifying the mechanism of the locking device.

[0006]

[Means for Solving the Problems]

 The points that this device uses as means for solving the above problems are as follows.

In this invention, a latch bolt for locking and unlocking by moving forward and backward with respect to the fixed frame that opens and closes the door, and an operation portion capable of retracting the latch bolt from the outside of the door are provided. It is premised on a locking device with a latch bolt, which comprises means for attaching the latch bolt to the door so that it can be moved forward and backward.

Under such a premise, the latch bolt is divided into a front portion and a rear portion, and the front portion is pivotable at a predetermined angle in the direction from the outside to the inside of the door under the action of the first biasing spring. It is a feature of the present invention that it is supported, and the rear portion thereof is provided with the operation portion, and can be advanced toward the fixed frame under the action of the second biasing spring.

[0009]

[Action]

 The locking device with a latch bolt thus constructed is attached to a door and used for a fixed frame having a latch bolt fitting port having an inner shape slightly larger than the outer shape of the latch bolt. When the operation part is retracted against the second biasing spring and the latch bolt is retracted from the fitting port, the front part of the latch bolt is swung toward the inside of the door by the action of the first biasing spring and the latch is latched. The bolt bends between the front and back. When the operation part is released, the latch bolt can move forward due to the action of the second biasing spring, but the swung front part comes into contact with the inlet of the fitting port, and further advance, that is, the entry into the fitting port. The locking device can be kept in the unlocked state.

[0010]

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

FIG. 1 is a perspective view of a distribution board 2 using a locking device 1 with a latch bolt. The distribution board 2 includes a door 3 and a fixed frame 4, and the door 3 can be opened and closed with respect to the fixed frame 4 via a hinge 5. The door 3 is provided with a handle 6 in addition to the two locking devices 1 used at the top and bottom. To open the door 3, the knob 12 of the locking device 1 is retracted to the left in the figure to unlock it, and then the handle 6 is pulled to the front side.

FIG. 2 is a view taken along the line XX of FIG. 1, showing the structure of the device 1 in the locked state. The locking device 1 is integrally formed with a housing 14 attached to the door 3 by a fixing member 13 described later, a latch bolt 15 slidably mounted in the housing 14 in the front-rear direction, and a latch bolt 15. 3 and an operation knob 12 extending outward, and a second urging spring 27 for urging the latch bolt 15 in the forward direction.

The housing 14 has four peripheries that are pressed against the outer surface of the door 3 and has a top plate 18 having a through hole 17 for operating the knob 12 in the center, a pair of opposing side plates 19 inside the door 3, and an end surface. It is composed of a plate 20 and a bottom plate 21. The end face plate 20 has a screw hole 24 for attaching the fixing member 13 with a screw 23. The housing 14 is made by abutting two members that are symmetrical to each other with respect to a center line (not shown) extending in the left and right longitudinal directions, and the set screw 25 laterally connects the two members. It is for fixing each other from the direction.

The latch bolt 15 is divided into a front portion 15A and a rear portion 15B. Between the two portions 15A and 15B, a shaft 26 that pivotally connects the front portion 15A and a front portion 15A around the shaft 26 are provided. 15B, and a first biasing spring 16 capable of rotating the door 2 from the horizontal state to the inside of the door 2 (downward in the figure) by a required angle. A cross section of the front portion 15A in the width direction perpendicular to the paper surface is rectangular, and a wedge-shaped protrusion 28 extends in the width direction at the lower portion of the front end. The rear end draws a substantially semicircle about the axis 26. At the starting point of the semicircle, there is a radial projection 29A, and when it comes into contact with the end wall 30 of the rear portion 15B as shown in the drawing, the front and rear portions 15A and 15B become horizontal. When the front portion 15A has swung inward by the required angle, the end point 29B of the semicircle abuts the bottom portion 13 of the rear portion 15B. The rear portion 15B is housed in the housing 14 so as to be slidable in the front-rear direction, and the operation knob 12 extends out of the top plate 18. There is a recess 31 at the rear end of the rear portion 15B, and one end of the second biasing spring 27 accommodated therein contacts the end face plate 20 of the housing to bias the rear portion 15B in the forward direction. Further, an oval through hole 32 extends in the width direction of the rear portion 15B, and a set screw 25 penetrates therethrough. The rear part 15B moves forward / backward and stops when the knob 12 contacts the front edge or the rear edge of the through hole 17.

The fixing frame 4 has a fitting port 35 having an inner shape slightly larger than the outer shape of the latch bolt front portion 15A, and the front portion 15A of the latch bolt 15 in the horizontal state is fitted therein. There is.

FIG. 3 is a side view similar to FIG. 2, showing a series of movements of the latch bolt front portion 15A when the door 3 is opened after unlocking the locking device 1. In the figure, only the front part 15A and a part of the fixed frame 4 are shown, and the other parts are omitted. The front part 15A moves sequentially from stage I to stage IV, and stage I represents the same locked state as in FIG. When the knob 12 is completely retracted in the stage I, the front portion 15A retreats from the fitting opening 35 of the fixed frame 4 and at the same time, the front portion 15A pivots by the action of the first biasing spring 16 and shifts to the stage II. 1 is in the unlocked state. In the stage II, the front portion 15A is in contact with the wall 4A of the fixed frame 4, and even if the knob 12 is released, the latch bolt 15 does not advance further and the unlocked state can be maintained. It Therefore, the door 3 is operated in the same manner with respect to the remaining locking devices 1 so that all of them are unlocked. Next, when the door 3 is started to open, the front portion 15A contacts the wall 4A by the action of the second biasing spring 27, reaches stage IV through stage III, and separates from the fixed frame 4. The arrows in the figure indicate the order of movement of the shaft 29A.

FIG. 4 is a side view similar to FIG. 3, showing a series of movements of the latch bolt front portion 15A when the door 2 is closed. The front part 15A returns from stage V to stage I via VI and VII and is locked. When the door 3 starts to be closed, the front portion 15A comes into contact with the fixed frame 4 and the stage V is set. When the door 3 is further closed, the front portion 15A descends along the wall 4A and moves slightly backwards against the second biasing spring 27, whereby the front portion 15A becomes horizontal and reaches the stage VII to VII. In the stage VII, the front portion 15A coincides with the fitting port 35, moves forward, and returns to the stage I. In the stage VI, the front end of the front portion 15A abuts on the wall 4A, while the protrusion 28 is located inside the fitting opening 35. In stage VII as well, the projection 28 is in the same state and is in contact with the bottom wall 35A of the fitting port 35, and when the front portion 15A is released from the contact with the wall 4A, the direction toward the inside of the door 3 is generated. Has prevented the turn. Due to such an action of the projection 28, even if the inner shape of the fitting port 35 is slightly larger than the outer shape of the front portion 15A, the front portion 15A does not rotate unnecessarily.

FIGS. 5A and 5B are a side view (A) and a rear view (B) showing how the locking device 1 is attached to the door 3. The locking device 1 is attached by sandwiching the door 3 between the top plate 18 and the fixing member 13. A ridge 40 is provided on the outer surface of each of the pair of side plates 19 of the housing 14, and a guide slope 41 is provided by utilizing the ridge thickness. The fixing member 13 is a U-shaped member that covers the pair of side surface plates 19 and the end surface plate 20 from the outside, has an engaging surface 42 for the inclined surface 41, and is attached to the housing 14 via the screw 23. It is attached. When the screw 23 is tightened, the fixing member 13 moves to the right at the clearance with the end face plate 20 and the engaging surface 41 slides on the slope 40, so that the outside direction of the door 3 (see FIG. Above). Thus, the fixing member 13 can hold the door 3 together with the top plate 18. In addition, the insertion hole of the screw 23 in the fixing member 13 is long in the vertical direction so as not to interfere with the movement of the member 13.

[0019]

[Effect of device]

 In the locking device according to the present invention, the front part of the latch bolt is pivotable with respect to the rear part. Therefore, once the latch bolt retreats from the fitting port of the fixed frame, the pivoted front part re-enters the fitting port. And the locking device can be kept in the unlocked state. Since the fixed frame only needs to be provided with a fitting port, the entire locking mechanism becomes relatively simple.

[Brief description of drawings]

FIG. 1 is a perspective view of a distribution board.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a schematic diagram showing the movement of the front portion of the latch bolt when the door is opened.

FIG. 4 is a schematic view showing the movement of the front portion of the latch bolt when the door is closed.

FIG. 5A is a side view showing a mounting state of the locking device,
(B) is a rear view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Locking device 3 Door 4 Fixed frame 12 Operation part (knob) 14 Housing 15 Latch bolt 15A Front part 15B Rear part 16 1st urging spring 27 2nd urging spring 28 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A latch bolt for locking and unlocking the door by advancing / retracting with respect to a fixed frame that opens and closes, an operation section capable of retracting the latch bolt from the outside of the door, and the latch. In a locking device with a latch bolt, which comprises a means for attaching a bolt to a door so that the bolt can be moved forward and backward, the latch bolt is divided into a front portion and a rear portion, and the front portion is acted on by a first biasing spring. The rear portion is pivotally supported by the rear portion so as to be pivotable by a required angle in a direction from the outside to the inside of the door, and the rear portion is provided with the operation portion and can be advanced toward the fixed frame under the action of the second biasing spring. The locking device described above.