JPH0637474U - Locking device - Google Patents

Abstract

(57) [Summary] [Purpose] To propose a simple device for retracting the latch bolt from the bolt hole. [Structure] A latch bolt 13 attached to a door 3 is biased toward a bolt hole 11 by a compression spring 14. Fixed frame 2
The lower surface 22B of the bolt hole 11 provided in the
A wing piece 23 that can swivel in the direction of the upper surface 22A is provided by 6. When the bolt 13 retreats from the bolt hole 11, the wing piece 23
Turns to block the entrance 21 of the bolt hole 11,
Block 3 re-entry.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a locking device including a latch bolt for locking a door and a bolt hole.

[0002]

[Prior art]

 Conventionally, in order to lock the door to the fixed frame, a latch bolt is attached to the door, a bolt hole is provided in the fixed frame, and the latch bolt is spring-biased in the direction of the bolt hole so that the lever is pushed from the outside of the door. It is well known that the bolts can be moved in and out of the bolt holes by operating the and knobs.

[0003]

[Problems to be solved by the device]

 In the above-mentioned known technique, when opening the door, the lever or the knob must be held by hand and the latch bolts interlocking with them must be held in the retracted state from the bolt hole. If the door is tall, it is preferable to lock the door at multiple locations.However, in the above-mentioned known technology, in order to keep the individual latch bolts retracted, the levers at multiple locations should be touched at the same time. There was a problem that this technology could not be used in practice.

Further, although it is possible to interlock each latch bolt with one lever, in this case, the mechanism is complicated for interlocking, and a large amount of space is required for mounting. There is a problem.

In view of this, the present invention retreats a plurality of ratch bolts one by one by providing a wing piece for a stopper capable of preventing re-entry of a latch bolt that has once retreated into the bolt hole. It is an issue to solve the above-mentioned problems by making it easy to keep the above condition.

[0006]

[Means for Solving the Problems]

 This invention is premised on solving the above-mentioned problems by operating the latch bolt on the inside of the door from the outside to enter / retract the bolt hole provided in the fixed frame to lock and unlock the door. The locking device is composed of a latch bolt and a bolt hole.

Under such a premise, the latch bolt is biased by the first biasing spring in the direction of entering the bolt hole. On the other hand, the bolt hole has a free end portion that swivels from the lower surface side to the upper surface side of the bolt hole under the action of the first biasing spring as the bolt retracts, and extends outward from the bolt entrance of the bolt hole. A wing piece capable of closing the bolt hole by engaging with the entrance edge is provided, and the revolving wing piece prevents re-entry of the retreated bolt to enable the door opening. Further, when the door is closed, the tip of the bolt is brought into pressure contact with the extended free end to push back the pivoted winglet, and the bolt can be re-entered into the bolt hole. Is.

[0008]

[Action]

 In the locking device configured as described above, when the latch bolt is once retracted from the bolt hole, the wing pieces swivel to close the bolt hole and act as a stopper that prevents the latch bolt from re-entering. When opening the door, retract the latch bolts one by one in this way. When the door is closed, the tip of the latch bolt, which is in the forward position due to the action of the first biasing spring, presses against the free end of the winglet extending from the bolt hole entrance and pushes back the winglet that has swung, Allows the latch bolt to re-enter the bolt hole.

[0009]

【Example】

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

FIG. 1 is a perspective view of a switchboard 1 using a locking device 4 according to the present invention. In the switchboard 1, a door 3 is attached to a fixed frame 2 so as to rotate and open and close. This switchboard 1 is high in height, and doors 3 are provided with locking devices 4 at upper and lower positions, and a handle 5 is fixed between them. The door 3 can be locked to the fixed frame 2 only at one place in the middle of its length, but when the length is high, it is preferable to lock it at two or more places as shown in the drawing. In such a case, the use of the locking device 4 facilitates the door opening operation.

FIG. 2 is a sectional view taken along the line AA in FIG. 1, in which the locking device 4 is in the locked state in (A) and is in the unlocked state in (B). The locking device 4 includes a latch bolt assembly 10 attached to the door 3 and a bolt hole 11 provided in the fixed frame 2. The assembly 10 includes a housing 12, a latch bolt 13, and a compression spring 14. The latch bolt 13 is slidable in the housing 12 inside the door 3 in the left-right direction, and the bolt 13 A compression spring 14 interposed between the housing 12 and the housing 12 biases the bolt 12 toward the bolt hole 11. The bolt 13 can be moved in the direction of retreating from the bolt hole 11 against the compression spring 14 by using the operation knob 15 provided on the upper surface thereof and extending from the through hole 12A of the housing 12 to the outside of the door 3. it can. The tip portion 16 of the bolt 13 is wedge-shaped and has an inclined surface 17 which rises to the right.

The bolt hole 11 is provided with upper and lower surfaces 22 A and 22 B, an entrance 21 through which the latch bolt 13 can advance and enter to the right, a wing piece 23, and a torsion spring 24 for biasing. ing. The wing piece 23 is rotatably attached to the attachment plate 25 fixed to the lower surface side 22B of the bolt hole 11 on the back side opposite to the entrance 21 via the turning shaft 26, and the free end portion 27 is Irrespective of the turning angle, it is extended to the outside of the entrance 21. The tip of the free end portion 27 has a cam surface 27A that smoothly bends inward. The torsion spring 24 is located between the lower surface 22B and the wing piece 23, and biases the wing piece 23 so as to rotate in the direction of the upper surface 22A as indicated by the arrow Y.

When the latch bolt 13 is in the bolt hole 11 (see FIG. 2A), the blade piece 23 pressed against the lower surface of the bolt 13 is lying down. When the knob 15 is manually operated to retract the bolt 13 (see FIG. 2 (B)), the wing piece 23 released from the pressing turns in the direction of the arrow Y, and the free end portion 27 causes the free end portion 27 to reach the upper edge of the entrance 21. And the entrance 21 is closed. When the bolt 13 is released from the knob 15, the tip 16 of the bolt 13 is pressed against the blade piece 23 from the inside by the biasing force of the compression spring 14, but cannot be re-entered into the bolt hole 11. If the door 3 is moved in this state in the opening direction, the tip portion 16 of the bolt 13 becomes a cam follower, and the bolt 13 moves in the retreating direction by sliding on the cam surface 27A of the free end portion 27 of the wing piece, and eventually the tip portion 16 is removed. Is disengaged from the wing pieces 23 and the resistance due to sliding is eliminated, and the door opening operation becomes easier.

FIG. 3 is a sectional view similar to FIG. 2, showing movements of the latch bolt 13 and the wing piece 23 in the door closing operation. When the door 3 is moved in the closing direction, the inclined surface 17 of the bolt moves in contact with the guide plate 29 and comes into pressure contact with the free end 27 extending from the entrance 21. On the other hand, the free end portion 27 serves as a cam follower on the outer side of the cam surface 27A, and the inclined surface 17 serves as a cam surface, and the inclined surface 17 slides downward. When the door 3 is further closed, the swirled wing 23 is pushed back, the bolt 3 enters the bolt hole 11 and returns to the state of FIG. 2 (A), and the door 3 is locked.

[0015]

[Effect of device]

 In the locking device configured as described above, since the latch bolt does not re-enter the bolt hole once it retreats, the door opening operation is easy even if multiple devices are used for one door.

Since such a device can be formed only by spring-biasing the latch bolt and providing a wing piece for a stopper in the bolt hole, the mechanism is simple and does not require much mounting space. .

[Brief description of drawings]

FIG. 1 is a perspective view of a switchboard using a locking device.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing (A) a locked state and (B) an unlocked state.

FIG. 3 is a sectional view similar to FIG. 2 showing a state when the door is closed.

[Explanation of symbols]

 2 Fixed frame 3 Door 4 Locking device 11 Bolt hole 13 Latch bolt 14 First biasing spring (compression spring) 21 Entrance 22A Upper surface 22B Lower surface 23 Wing piece 24 Second biasing spring (torsion spring)

Claims (1)

[Scope of utility model registration request] 1. A locking device comprising a latch bolt and a bolt hole for locking and unlocking the door by operating a latch bolt on the inside of the door from the outside to move the latch bolt into and out of a bolt hole provided in a fixed frame. While the latch bolt is urged by a first urging spring in an approaching direction to the bolt hole, the bolt hole lower surface side is acted on by a second urging spring in the bolt hole as the bolt retreats. A wing piece capable of closing the bolt hole by swiveling from the above to the upper surface side and engaging a free end of the bolt hole extending outward from the bolt entrance to the entrance edge, The swirled wing piece prevents reentry of the retracted bolt to allow the door to open, and at the time of closing the door, the bolt tip is pressed against the extended free end to swirl the wing. Push back the piece to re-enter the bolt hole. The locking device described above.