JP2002357028A - Key handle insertion/extraction type locking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key handle insertion/extraction type locking device which can surely prevent the occurrence of situations, in which a locking shaft is kept in an unlocked state and in which a key handle cannot be inserted into a fixed body, by reversely utilizing back tension acting on the locking shaft. SOLUTION: When the locking shaft 5 is excessively turned from a normal locking position at an angle corresponding to loose play between the fixed body 1 and the locking shaft 5, an opening width of a groove 11 for identifying a location of the insertion/extraction of the fixed body 1 is set to be greater than a width of a protrusion 14 for pulling of the key handle 13 so that the protrusion 14 can be extracted from the groove 11, and a play space 32 corresponding to the loose play is set between a locking groove 10 of the locking shaft 5 and a locking pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device of a key handle detachable type used for a door of a device storage box such as a switchboard or a control panel.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. 55-29643, in a conventional key handle detachable locking device, a large-diameter shaft hole and a small-diameter shaft hole are formed forward and backward along the axial direction in a fixed main body. An inner flange portion is formed to project from the inner surface of the front end of the large-diameter shaft hole, and a locking shaft is rotatably inserted into the small-diameter shaft hole of the fixed body, and a pin receiving hole is formed around the small-diameter shaft hole in the fixed body. The lock pin is formed in the same direction as above, and a lock pin urged forward by a compression coil spring is inserted into the pin receiving hole, and the lock pin is disposed on the outer peripheral surface of the enlarged head of the locking shaft disposed in the large-diameter shaft hole of the fixed body. A part of the cross section forms a locking groove to be engaged. Then, a groove for insertion / removal positioning is formed in the inner flange portion of the fixed main body, and a cylindrical portion which is inserted / removed into the large-diameter shaft hole of the fixed main body and is fitted to the head of the locking shaft so as to be relatively non-rotatable in a specific positional relationship. At the tip of the key handle, a traction projection is formed on the outer surface of the cylindrical portion that passes through the insertion / removal positioning groove of the fixed body, and the front surface of the lock pin is pressed by the distal end surface of the cylindrical portion to fix the lock pin to the fixed body. The locking restraint of the locking shaft with respect to the fixed body is released by retracting the locking shaft into the pin receiving hole, and the locking shaft is rotated to the unlocking position by the key handle, so that the tow-out projection of the key handle is moved to the inside of the fixed body. It comes into contact with the back of the flange and is pulled by the key handle.

In the normal operation of the key handle insertion / removal type locking device configured as described above, when the retraction projection of the key handle is turned to a position aligned behind the insertion / removal positioning groove of the fixed body, the key handle is integrated with the key handle. The locking groove in the head of the rotating locking shaft is aligned with the pin receiving hole of the fixed body, and at that moment, the lock enters the locking groove by the urging of the compression coil spring, and the locking shaft is moved to the fixed body. It is supposed to be rotationally constrained.

[0004] However, the inner peripheral surface of the small-diameter shaft hole of the fixed main body is provided with a slight draft at the design stage in order to improve the removability at the time of die-casting. The clearance is set at the design stage between the inner peripheral surface of the small-diameter shaft hole and the outer peripheral surface of the locking shaft in order to smoothly perform the above, and the error is caused by an error at the time of forming the fixing body and the locking shaft. Due to the fact that the clearance tends to be larger than the design value, there is inevitably some play between the fixed body and the locking shaft.

[0005] The existence of such play is a major cause of malfunction of the lock device as described below. That is, despite the fact that the lock groove of the locking shaft is not yet aligned with the pin receiving hole of the fixed body, apparently the tow-out projection of the key handle is caused by the insertion / removal positioning groove of the fixed body due to the loose play. It is to come to a position aligned behind. The worker who visually confirmed that he had arrived at this position mistakenly recognized that locking had been achieved,
The key handle is pulled out of the fixed body.

However, at this stage, since the lock groove of the lock shaft and the pin receiving hole of the fixed body are not aligned, it is impossible for the lock pin to enter the lock groove, and the lock shaft is inserted into the fixed body. On the other hand, it is in an unlocked state that is not restricted by rotation. If the worker leaves as it is, the locking shaft may accidentally rotate in the unlocking direction due to the back tension caused by the biasing load of the locking plate or the locking rod connected to the rear end of the locking shaft. Yes,
This may lead to a dangerous situation in which the door of the device storage box is not locked to the box body. The cylindrical portion of the key handle is shaped so that it can be fitted to the locking shaft head only when the locking shaft comes to the normal locking position and the cylindrical portion can take a specific positional relationship with the locking shaft. (The fitting positioning protrusion formed on the head of the locking shaft and the fitting positioning groove formed on the inner surface of the cylindrical portion), and the key handle is fixed when the locking shaft is turned in the unlocking direction by the back tension. It becomes impossible to insert into the main body, and the lock device becomes unusable.

When the locking shaft is completely turned to the normal unlocking position by the back tension, the lock device itself cannot be used, but the door of the device storage box can be opened. However, when the rotation of the locking shaft in the locking direction stops halfway, the door cannot be opened because the door is still in the locked or semi-locked state. The only way to remove the door from the box body is to destroy it.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reversely use a back tension acting on a locking shaft so that the locking shaft is left in an unlocked state,
An object of the present invention is to provide a key handle insertion / removal lock device that can reliably prevent a situation where a key handle cannot be inserted into a fixed main body.

[0009]

Means for Solving the Problems Hereinafter, a description will be given by using reference numerals in the accompanying drawings. A key handle insertion / removal type lock device to which the present invention is applied is a large-diameter shaft hole 2 in a fixed main body 1.
And a small-diameter shaft hole 3 are formed forward and backward along the axial direction, an inner flange 4 is formed to project from the inner surface of the front end of the large-diameter shaft hole 2, and the locking shaft 5 is rotatable with the small-diameter shaft hole 3 of the fixed body 1. A pin receiving hole 6 is formed in the fixed main body 1 around the small diameter shaft hole 3 in the axial direction, and a lock pin 8 urged forward by a compression coil spring 7 is inserted into the pin receiving hole 6, and the fixed main body 1 is inserted. A lock groove 10 with which a part of the cross section of the lock pin 8 is engaged is formed on the outer peripheral surface of the enlarged head 9 of the lock shaft 5 disposed in the large-diameter shaft hole 2.

[0010] An insertion / removal positioning groove 11 is formed in the inner flange portion 4 of the fixed main body 1, and is inserted / removed into the large-diameter shaft hole 2 of the fixed main body, so that the head 9 of the locking shaft 5 cannot be relatively rotated in a specific positional relationship. A cylindrical portion 12 fitted to the key handle 13 is provided at the tip of the key handle 13, and a towing projection 14 that passes through the insertion / removal positioning groove 11 of the fixed body is formed on the outer surface of the cylindrical portion 12.
The front surface of the lock pin 8 is pushed by the front end surface 15 of the lock body 8 to retract the lock pin 8 into the pin receiving hole 6 of the fixed body 1, thereby releasing the rotation constraint of the lock shaft 5 with respect to the fixed body 1. 5 is rotated to the unlocked position, and the towing protrusion 14 of the key handle 13 is brought into contact with the back surface of the inner flange portion 4 of the fixed body 1 so as to be pulled by the key handle 13.

A feature of the present invention is that, in the locking device thus configured, the locking shaft 5 is excessively rotated from the regular locking position by an angle corresponding to the play between the fixed body 1 and the locking shaft 5. At the time, the towing protrusion 1 of the key handle 13
The opening width of the insertion / removal positioning groove 11 is set to be wider than the width of the traction projection 14 so that the insertion / removal 4 can be removed from the insertion / removal positioning groove 11 of the fixed body 1, and between the lock groove 10 and the lock pin 8 of the locking shaft 5. In addition, a play space 32 corresponding to the play is set.

[0012]

The fixed main body 1 is fitted into the mounting hole 17 of the door panel 16 of the equipment storage box from the front side so as to be relatively non-rotatable, and is fixedly fastened to the door panel 16 by the nut 19 fitted to the outer thread 18. At the rear end of the locking shaft 5 protruding to the rear side of the fixed main body 1, a stopper plate 22 which engages with the metal receiving portion 21 of the box main body 20 in accordance with the usage mode.
And a lock interlocking plate are fitted so as not to rotate relative to each other, and are fixedly fastened by bolts 23. The base end of the lock rod is connected to the lock interlocking plate, and a dead bolt or a spring-biased latch bolt that engages with the receiving hole of the box body 20 is connected to the distal end of the lock rod. Will be done.

As shown in FIG. 4, when the stopper plate 22 is engaged with the receiving portion 21 on the box body 20 and the door panel 16 is locked so as not to be opened with respect to the box body 20, The lock groove 10 of the lock shaft 5 is located at a position aligned with the pin receiving hole 6 of the fixed main body 1, and the front end of the lock pin 8 urged to move by the compression coil spring 7 enters the lock groove 10 by a predetermined depth. The front end surface of the lock pin 8 is pressed against the bottom surface on the front end side of the lock groove 10 of the lock shaft 5. Thereby, the locking shaft 5 is restrained from rotating with respect to the fixed main body 1.

Release the rotation constraint of the locking shaft 5 and release the locking plate 2
In order to turn the knob 2 to the unlocking position, as shown in FIG. 5, the pulling projection 14 of the cylindrical portion 12 of the key handle 13 is aligned with the insertion / removal positioning groove 11 of the inner flange portion 4 of the fixed body 1. ,
The cylindrical portion 12 is inserted into the large-diameter shaft portion 2 of the fixed main body 1. The cylindrical portion 12 fitted to the head 9 of the locking shaft 5 so as to be relatively non-rotatable at a specific relational position pushes the front surface of the lock pin 8 by the tip end surface 15 thereof, and the lock pin 8 is pressed against the bias of the compression coil spring 7. Is retracted into the pin receiving hole 6 of the fixed main body 1. As a result, the rotation of the locking shaft 5 with respect to the fixed main body 1 is released, so that the locking shaft 5 is rotated to the unlocking position by the key handle 13 and the stopper plate 22 is detached from the metal receiving portion 21 of the box main body 20. . Thereby, the lock of the door panel 16 with respect to the box main body 20 is released. At this stage, the towing projection 14 of the key handle 13 is in contact with the back surface of the inner flange portion 4 of the fixed main body 1, so that the door panel 16 is opened by towing the key handle 13 toward the user.

After the door panel 16 is closed, by turning the key handle 13 in the reverse direction, the key handle 13 and the lock shaft 5 rotate integrally, and the stopper plate 22
The door panel 16 is locked to the box body 20 by re-engaging with the key handle 1.
The reverse rotation of 3 is performed such that the normal locking position is overrun by an amount corresponding to the play between the fixed body 1 and the locking shaft 5. Even if the lock shaft 5 rotates excessively in this way,
The opening width of the insertion / removal positioning groove 11 of the fixed body 1 as viewed in the circumferential direction is set to be wider than the width of the towing projection 14 of the key handle 13 by the amount corresponding to the play, and the locking groove of the locking shaft 5 is also provided. Since a play space 32 corresponding to the play is set between the lock pin 10 and the lock pin 8, as shown in FIGS. 12 and 13, the tow projection 14 of the key handle 13 is moved in the excessive rotation position. The fixing body 1 can be directly removed from the insertion / removal positioning groove 11.

Immediately after removing the key handle 13,
When the lock shaft 5 is automatically corrected and rotated to the normal lock position by the action of the back tension, the lock groove 10 of the lock shaft 5 is aligned with the pin receiving hole 6 of the fixed body 1 as shown in FIG. In order to come to the regular locking position, the front end of the lock pin 8 moved and urged by the compression coil spring 7 enters the lock groove 10 and the locking shaft 5 is fixed to the fixed body 1.
Is constrained to rotate. On the other hand, when the locking shaft 5 does not automatically correct and rotate due to a large friction acting between the stopper plate 22 and the receiving portion 21 to overcome the back tension, as shown in FIG. The lock shaft 5 is left in a state where the lock groove 10 of the lock shaft 5 is not aligned with the pin receiving hole 6 of the fixed main body 1, and the locking of the lock shaft 5 with respect to the fixed main body 1 is not established.

In such an unlocked state, the towing projection 14 of the cylindrical portion 12 is not
Is immediately noticed by the operator's visual observation that he is not aligned behind. The worker who has confirmed that the lock has been unlocked, corrects and rotates the key handle by his / her own manual operation, so that the lock groove 10 of the lock shaft 5 is aligned with the pin receiving hole 6 of the fixed main body 1. Since the lock 8 engages with the lock groove 10, the lock of the lock shaft 5 with respect to the fixed main body 1 is established. Therefore, the locking shaft 5 is not left in an unlocked state.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a fixed body 1 is shown.
The four pin receiving holes 6 and the lock grooves 10 of the locking shaft 9 are formed at intervals of 90 degrees. Two insertion / removal positioning grooves 11 of the fixed main body 1 and two towing projections 14 of the key handle 13 are formed at 180-degree intervals. The shape setting so that the cylindrical portion 12 of the key handle 13 can be fitted to the head 9 of the locking shaft 5 only in a specific positional relationship is performed by fitting to the outer surface of the head 9 of the locking shaft 5. This is performed by forming four projections 24 at 90-degree intervals and providing four positioning grooves 25 at 90-degree intervals on the inner surface of the cylindrical portion 12. The fitting positioning protrusion 24 and the fitting positioning groove 25 also function as a transmission path of a rotational force from the key handle 13 to the locking shaft 5. This shape setting can also be performed by setting the head 9 to have a hexagonal cross section and setting the hollow section of the cylindrical portion 12 to be hexagonal.

As shown in FIG. 12, when the locking shaft 5 comes to the normal locking position, the width of one side half of the insertion / removal positioning groove 11 with respect to the reference line S where the center line R of the retraction projection 14 overlaps. Compared to the dimension L1, the width dimension L of the other side
2 is wider, and the difference between the two is commensurate with the play. A cap 2 for concealing the front opening of the large-diameter shaft hole 2 and the head 9 of the locking shaft 5 is provided in the fixed body 1.
6 are equipped. On the back side of the cap 26, a shaft cylinder portion 27 is formed so as to protrude at an eccentric position.
Is a shaft hole 28 penetrating the upper part of the large-diameter shaft hole 2 in the front-rear direction.
And is rotatably attached to the fixed main body 1 by screws 30 via a washer plate 29. The compression coil spring 31 fitted to the shaft cylinder portion 27 is compressed between the back surface of the cap 26 and the washer plate 29, and attracts the cap 26 to the front surface of the fixed main body 1.

[0020]

As described above, according to the lock device of the present invention, the angle corresponding to the loose play between the fixed body and the locking shaft is
Even when the locking shaft is excessively rotated from the regular locking position, the opening width of the insertion / removal positioning groove is adjusted so that the retraction projection of the key handle can be removed from the insertion / removal positioning groove of the fixed body. Since the play space corresponding to the play is also set between the lock groove and the lock pin of the lock shaft while the lock shaft is set wider, the lock shaft is actuated by the action of the back tension after the key handle is removed. By automatically correcting and rotating by the amount corresponding to the play, the lock groove of the lock shaft will return to the proper lock position aligned with the pin receiving hole of the fixed body, and the lock shaft will be left in the unlocked state Or the key handle cannot be inserted into the fixed body.

[Brief description of the drawings]

FIG. 1 is a front view of a lock device according to an embodiment of the present invention when a key handle is removed, showing a state in which a cap is in an open position and a locking shaft is properly rotationally restrained with respect to a fixed main body. ing.

FIG. 2 is a right side view of the lock device of FIG.

FIG. 3 is a rear view of the lock device of FIG. 1;

FIG. 4 is a cross-sectional view showing a mounting mode of the lock device of FIG. 1 to a door panel, which is cut along a line AA in FIG. 1, and a cap is in a closed state.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. 1 and shows a state in which a cylindrical portion of the key handle is fitted into a large-diameter shaft hole of the fixed main body.

FIG. 6 is a front view of the key handle of FIG. 5;

FIG. 7 is a left side view of the key handle of FIG. 5;

FIG. 8 is a sectional view taken along line BB of FIG. 6;

FIG. 9 is a front view of a lock shaft incorporated in the lock device of FIG. 1;

FIG. 10 is a right side view of the locking shaft of FIG. 9;

FIG. 11 is a rear view of the locking shaft of FIG. 9;

FIG. 12 is an enlarged sectional view of a main part when the locking shaft is excessively rotated by an amount corresponding to loose play from a regular locking position, and the key handle has not yet been removed from the fixed main body.

13 is a front view of the lock device immediately after the key handle is removed from the state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed main body 2 Large diameter shaft hole 3 Small diameter shaft hole 4 Inner flange part 5 Locking shaft 6 Pin receiving hole 7 Compression coil spring 8 Lock pin 9 Head of locking shaft 10 Lock groove 11 Insertion / extraction positioning groove 12 Tube part 13 Key handle 14 Towing protrusion 15 Lock pin pushing tip surface 16 Door panel 17 Mounting hole 18 Peripheral screw portion 19 Nut 20 Box body 21 Receiving portion 22 Clasp plate 23 Bolt 24 Fitting positioning protrusion 25 Fitting positioning groove 26 Cap 27 Shaft tube part 28 Shaft hole 29 Washer plate 30 Screw 31 Compression coil spring 32 Play space of lock groove

Claims (1)

[Claims] 1. A large-diameter shaft hole and a small-diameter shaft hole are formed in the fixed body in front and rear along the axial direction, and an inner flange portion is formed to project from an inner surface of a front end of the large-diameter shaft hole. A rotatable fitting is inserted into the small-diameter shaft hole, a pin receiving hole is formed in the fixed body around the small-diameter shaft hole in the axial direction, and a lock pin urged forward by a compression coil spring is inserted into the pin receiving hole. A lock groove is formed on the outer peripheral surface of the enlarged head of the locking shaft disposed in the large-diameter shaft hole of the fixed main body so that a part of the cross section of the lock pin is engaged with the lock flange, and is inserted into and removed from the inner flange portion of the fixed main body. A positioning groove is formed, and a cylindrical portion which is inserted into and removed from the large-diameter shaft hole of the fixed main body and is relatively non-rotatably fitted to the head of the locking shaft in a specific positional relationship is provided at the tip of the key handle. An outer surface is formed with a towing protrusion that passes through the insertion / removal positioning groove of the fixed body, and a distal end surface of the cylindrical portion. By pressing the front surface of the lock pin and retracting the lock pin into the pin receiving hole of the fixed body, the rotation constraint of the locking shaft with respect to the fixed body is released,
Rotate the lock shaft to the unlock position with the key handle,
In a key handle insertion / removal type locking device in which the towing projection of the key handle is brought into contact with the back surface of the inner flange portion of the fixed body to be pulled by the key handle, it corresponds to a loose play between the fixed body and the locking shaft. When the locking shaft is excessively rotated from the regular locking position by the angle, the opening width of the insertion / removal positioning groove is adjusted so that the retraction projection of the key handle can be removed from the insertion / removal positioning groove of the fixed body. A key handle insertion / removal type lock device, wherein the width is set wider than the width, and a play space corresponding to the play is set between the lock groove and the lock pin of the lock shaft.