JP3556614B2 - Key handle removable locking device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lock device of a key handle removable type used for a door of an equipment storage box such as a switchboard or a control panel.
[0002]
[Prior art]
As disclosed in Japanese Utility Model Publication No. 55-29643, in a conventional key handle insertion / removal type locking device, 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. An inner flange portion is formed so as to protrude from an inner surface of a front end of the hole, a locking shaft is rotatably inserted into the small-diameter shaft hole of the fixed body, and a pin receiving hole is formed in the fixed body in an axial direction around the small-diameter shaft hole, A lock pin urged forward by a compression coil spring is inserted into the pin receiving hole, and a part of the cross section of the lock pin is provided on the outer peripheral surface of the enlarged head of the locking shaft disposed in the large-diameter shaft hole of the fixed body. Form a lock groove to be engaged.
Then, a groove for insertion / removal positioning is formed in the inner flange portion of the fixed body, and a cylindrical portion which is inserted / removed into the large-diameter shaft hole of the fixed body and which 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 retractable projection of the key handle is moved into the fixed body. It comes into contact with the back of the flange and is pulled by the key handle.
[0003]
In the normal operation of the key handle insertion / removal lock 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 rotated integrally with the key handle. The lock groove of the head of the lock shaft is aligned with the pin receiving hole of the fixed body, and at that moment, the lock enters the lock groove by the bias of the compression coil spring, and the lock shaft rotates with respect to the fixed body. It is to be restrained.
[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 during die casting, and the rotation of the locking shaft is smoothly performed. A 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 perform the operation, and the clearance is designed by an error in molding the fixed main body and the locking shaft. Because of the tendency to expand beyond the value , there is inevitably a clearance between the fixed body and the locking shaft that has a size that causes the locking shaft to move in the small-diameter shaft hole .
[0005]
The presence of such floating clearance is a major cause of the malfunction of the lock device as described below.
That is, even though 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 floating clearance . It comes to a position aligned behind. The operator who visually confirms that he has arrived at this position mistakenly believes that locking has been achieved, and removes the key handle from the fixed main body.
[0006]
However, at this stage, since the lock groove of the lock shaft and the pin receiving hole of the fixed body are not aligned, the lock pin cannot enter the lock groove, and the lock shaft rotates with respect to the fixed body. Unlocked and unlocked.
If the worker leaves as it is, the locking shaft may be accidentally rotated 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. There is a danger that 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.) When the locking shaft is turned in the unlocking direction by the back tension, the key handle is fixed. It becomes impossible to insert into the main body, and the lock device becomes unusable.
[0007]
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 locked or semi-locked, and the hinge portion of the door is not disassembled or disassembled. The only way to remove the door from the box body is to destroy it.
[0008]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to reverse the back tension acting on the locking shaft to ensure that the locking shaft is left in an unlocked state or that a key handle cannot be inserted into the fixed body. It is an object of the present invention to provide a key handle insertion / removal type locking device which can be prevented from occurring.
[0009]
[Means for Solving the Problems]
The key handle detachable locking device to which the present invention is applied will be described below with reference to the reference numerals in the accompanying drawings. A large-diameter shaft hole 2 and a small-diameter shaft hole 3 are provided in a fixed main body 1 in the axial direction. An inner flange portion 4 is formed on the inner surface of the front end of the large-diameter shaft hole 2 so as to protrude therefrom. A locking shaft 5 is rotatably inserted into the small-diameter shaft hole 3 of the fixed main body 1. A pin receiving hole 6 is formed 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 a locking shaft 5 disposed in the large-diameter shaft hole 2 of the fixed body 1. 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.
[0010]
Then, an insertion / removal positioning groove 11 is formed in the inner flange portion 4 of the fixed main body 1, is inserted / removed into the large-diameter shaft hole 2 of the fixed main body, and is fitted to the head 9 of the locking shaft 5 so as to be relatively non-rotatable in a specific positional relationship. A tubular portion 12 is provided at the tip of the key handle 13, and a towing protrusion 14 is formed on the outer surface of the tubular portion 12 so as to pass through the insertion / removal positioning groove 11 of the fixed body. To release the lock pin 8 into the pin receiving hole 6 of the fixed body 1 to release the rotation constraint of the locking shaft 5 with respect to the fixed body 1, and rotate the locking shaft 5 to the unlocking position by the key handle 13, 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 main body 1 so as to be towed by the key handle 13.
[0011]
The feature of the present invention resides in the locking device configured as described above , wherein the locking shaft 5 is provided between the inner peripheral surface of the small diameter shaft hole 3 of the fixed body 1 and the outer peripheral surface of the locking shaft 5. When defining a clearance having a size that causes movement in the hole 3 as a floating clearance,
When the locking shaft 5 is excessively rotated from the normal locking position by the angle corresponding to the floating clearance , the pulling projection 14 of the key handle 13 is pulled out from the insertion / removal positioning groove 11 of the fixed body 1. That is, the opening width of the groove 11 is set to be wider than the width of the pulling projection 14, and a play space 32 is set between the lock groove 10 of the locking shaft 5 and the lock pin 8 for an angle corresponding to the floating clearance. .
[0012]
Effect of the Invention
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 a 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 or a lock interlocking plate which engages with the metal receiving portion 21 of the box main body 20 is relatively provided depending on the usage. It is fitted non-rotatably and fastened and fixed 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.
[0013]
As shown in FIG. 4, in a state where the stopper plate 22 is engaged with the metal receiving portion 21 on the box body 20 side and the door panel 16 is locked so as not to be opened with respect to the box body 20, the locking shaft 5 Is located at a position aligned with the pin receiving hole 6 of the fixed 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 face of the lock pin 8 is pressed against the bottom face 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.
[0014]
In order to release the rotation restraint of the locking shaft 5 and turn the stopper plate 22 to the unlocking position, as shown in FIG. The cylindrical portion 12 is inserted into the large-diameter shaft portion 2 of the fixed main body 1 while being aligned with the insertion / removal positioning groove 11 of the portion 4. The cylindrical portion 12 fitted to the head 9 of the locking shaft 5 so as to be relatively non-rotatable at a specific relation 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 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 body 20. . Thereby, the lock of the door panel 16 with respect to the box main body 20 is released. At this stage, the tow projection 14 of the key handle 13 is in contact with the back surface of the inner flange 4 of the fixed main body 1, so that the key panel 13 is pulled to open the door panel 16.
[0015]
After closing the door panel 16, by turning the key handle 13 in the opposite direction, the key handle 13 and the locking shaft 5 rotate integrally, and the stopper plate 22 engages with the receiving part 21 again. The door panel 16 is locked to the box body 20, and the reverse rotation of the key handle 13 causes the normal locking position to overrun by the amount of the play clearance between the fixed body 1 and the locking shaft 5. Done.
Thus, even if the locking shaft 5 rotates excessively, the opening width of the insertion / removal positioning groove 11 of the fixed main body 1 as viewed in the circumferential direction is wider than the width of the retraction projection 14 of the key handle 13 by the amount corresponding to the play. Since the play space 32 is set between the lock groove 10 of the lock shaft 5 and the lock pin 8 for the angle corresponding to the floating clearance , as shown in FIGS. In addition, the towing protrusion 14 of the key handle 13 can be directly removed from the insertion / removal positioning groove 11 of the fixed body 1 at the excessive rotation position.
[0016]
Immediately after the key handle 13 is removed, 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 fixed to the fixed main body as shown in FIG. In order to come to a regular locking position at a position aligned with the pin receiving hole 6, the front end of the lock pin 8 moved and urged by the compression coil spring 7 enters the lock groove 10, and the lock shaft 5 It is restricted by rotation.
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.
[0017]
Such an unsuccessful locking state can be immediately noticed by the operator visually observing that the towing projection 14 of the cylindrical portion 12 is not aligned behind the insertion / removal positioning groove 11 of the fixed body 1. The worker who has confirmed that the lock is unlocked, corrects and rotates the key handle by his / her own manual operation, thereby aligning the lock groove 10 of the lock shaft 5 with the pin receiving hole 6 of the fixed body 1, whereby the lock pin 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]
BEST MODE FOR CARRYING OUT THE INVENTION
In the illustrated embodiment, four pin receiving holes 6 of the fixed main body 1 and four lock grooves 10 of the locking shaft 9 are formed at 90-degree intervals. Two insertion / removal positioning grooves 11 of the fixed main body 1 and two towing protrusions 14 of the key handle 13 are formed at intervals of 180 degrees. 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 positioning the fitting to the outer surface of the head 9 of the locking shaft 5. Four projections 24 are formed at 90-degree intervals, and four fitting positioning grooves 25 are provided 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.
[0019]
As shown in FIG. 12, when the locking shaft 5 comes to the normal locking position, the width L1 of one half of the insertion / removal positioning groove 11 with respect to the reference line S where the center line R of the pulling projection 14 overlaps. In comparison, the width dimension L2 on the other side is wider, and the difference between the two is in line with the loose play.
The fixed main body 1 is provided with a cap 26 for covering the front opening of the large-diameter shaft hole 2 and the head 9 of the locking shaft 5. On the back side of the cap 26, a shaft tube portion 27 is formed so as to protrude at an eccentric position, and the shaft tube portion 27 is fitted into a shaft hole 28 penetrating an upper portion of the large-diameter shaft hole 2 in the front-rear direction. It is rotatably attached to the fixed main body 1 by screws 30 via 29. The compression coil spring 31 fitted to the shaft cylinder 27 is compressed between the back surface of the cap 26 and the washer plate 29, and draws the cap 26 to the front surface of the fixed main body 1.
[0020]
【The invention's effect】
The lock apparatus of the present invention, as described above, the angle component corresponding to Yu dynamic play between the fixed body and the locking shaft, in case that was over-rotation of the locking shaft from the normal locking position is also towing projection of the key handle The opening width of the insertion / removal positioning groove is set wider than the width of the retraction protrusion so that the clearance can be removed from the insertion / removal positioning groove of the fixed body, and the floating clearance is also provided between the lock groove and the lock pin of the locking shaft. Since the play space for the angle corresponding to the angle is set, the locking shaft is automatically corrected and rotated by an amount corresponding to the floating clearance by the action of the back tension after the key handle is removed, so that the locking groove of the locking shaft is formed. The lock will return to the normal locking position aligned with the pin receiving hole of the fixed body, and the locking shaft will be left unlocked or the key handle will be locked. Generation of insertion impossible to become such a situation is reliably prevented.
[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 state of the lock device of FIG. 1 to a door panel, which is cut along a line AA of 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, showing a state in which a tubular 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 lock shaft is excessively rotated by an amount corresponding to loose play from a normal lock position, and the key handle has not yet been removed from the fixed main body.
FIG. 13 is a front view of the lock device immediately after the key handle is removed from the state of FIG. 12;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed main body 2 Large diameter shaft hole 3 Small diameter shaft hole 4 Inner collar 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 portion 13 Key handle 14 Towing protrusion 15 Lock pin pushing tip surface 16 Door panel 17 Mounting hole 18 Outer thread 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 portion 28 Shaft hole 29 Washer plate 30 Screw 31 Compression coil spring 32 Play space for lock groove

Claims (1)

A large-diameter shaft hole and a small-diameter shaft hole are formed in the fixed body in front and back along the axial direction, and an inner flange portion is formed to protrude on the inner surface of the front end of the large-diameter shaft hole. The pin is rotatably inserted, a pin receiving hole is formed in the fixed body in the axial direction around the small-diameter shaft hole, and a lock pin urged forward by a compression coil spring is inserted into the pin receiving hole. A lock groove in which a part of the cross section of the lock pin is engaged is formed on the outer peripheral surface of the enlarged head of the lock shaft disposed in the radial shaft hole, and a positioning groove is formed in the inner flange portion of the fixed body. At the tip of the key handle, there is provided a cylindrical portion which is inserted into and removed from the large-diameter shaft hole of the fixed body and is relatively non-rotatably fitted to the head of the locking shaft in a specific positional relationship. A tow projection that passes through the insertion / removal positioning groove is formed, and the lock pin is By pressing the front of the lock pin and retracting the lock pin into the pin receiving hole of the fixed body, the rotation restraint of the locking shaft with respect to the fixed body is released, and the locking shaft is rotated to the unlocking position by the key handle, and the key handle is rotated. In a key handle detachable locking device in which a tow projection is brought into contact with the back surface of the inner flange portion of the fixed body and pulled by a key handle, an inner peripheral surface of the small-diameter shaft hole of the fixed body and an outer periphery of a locking shaft are provided. When a clearance of a size that exists between the surface and the lock shaft and causes the lock shaft to move in the small-diameter shaft hole is defined as a floating clearance,
The opening width of the insertion / removal positioning groove so that when the locking shaft is excessively rotated from the normal locking position by an angle corresponding to the floating clearance , the towing projection of the key handle can be removed from the insertion / removal positioning groove of the fixed body. A key handle insertion / removal lock, wherein a play space for an angle corresponding to the floating clearance is set between the lock groove and the lock pin of the locking shaft, while setting a width wider than the width of the tow projection. apparatus.

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