JP2004339704A - Door lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door lock superior in safety which is not unlocked by operation of a wire inserted indoors from the outdoors. <P>SOLUTION: A cover 24 is rotatably fitted to an end part of a rotatably supported turn shaft 22 for advancing-retreating a dead bolt 4. A push button 36 is incorporated into a button inserting hole 35 arranged on the outer periphery of the cover 24, and a spring 39 for pressing the push button 36 outward is incorporated inside the cover 24. A projection piece 38 is arranged in the push button 36, and a plurality of detent grooves 42 are formed on the outer periphery of the turn shaft 22. The safety is secured, by locking/unlocking the door lock, by two operations of stopping rotation of the cover 24 to the turn shaft 22, by fitting the projection piece 38 to one of the detent grooves 42 by pushing-in of the push button 36, and rotating the cover 24 by holding the push button 36 in a pushing-in state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a door lock for locking a door in a closed position.
[0002]
[Prior art]
This type of door lock has a cylinder lock and a thumb turn, and the rotation of a key inserted into the key groove of the cylinder lock, or the rotation of the thumb turn causes the dead bolt to move between the locked position and the unlocked position. A device for moving forward and backward is conventionally known.
[0003]
[Problems to be solved by the invention]
By the way, in a door lock having a thumb turn, since the thumb turn has a flat plate shape, a through hole is formed in the door by a drill, a wire is inserted into the through hole, and a bent piece provided at the tip of the wire is inserted. When the wire is pulled while being engaged with the thumb turn, the thumb turn may be rotated and the door lock may be unlocked, and there is a problem in safety.
[0004]
In order to solve such a problem, it is extremely effective to cover the thumb-turn with a removable cover or to make the thumb-turn circular so that the wire is not engaged. On the other hand, in the safety device in which the thumb turn is made to be circular, slippage occurs when the thumb turn rotates, resulting in a disadvantage that operability is deteriorated.
[0005]
An object of the present invention is to provide a door lock excellent in safety, which can reliably prevent an unlocking operation by a wire inserted from outdoors to indoors.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a turn shaft is rotatably supported by a bearing protruding outward from a side plate of a lock case, and the dead bolt is moved forward and backward by rotation of the turn shaft. In the door lock, a cover is rotatably fitted to an end protruding outward from the bearing end surface of the turn shaft, and a push button is slidably incorporated into a button insertion hole formed on an outer periphery of the cover, and a cover is provided. An elastic body that presses the push button outward is provided inside, and a detent mechanism is provided between the push button and the turn shaft to prevent the cover from turning around the turn axis by pushing the push button. .
[0007]
With the above-described configuration, the rotation operation of the turn shaft for moving the dead bolt forward and backward requires two operations of pressing the push button and rotating the cover while maintaining the pressed state. For this reason, it is impossible to perform the above two operations with a wire inserted from the outdoors to the indoor, and it is possible to prevent the door lock from being unlocked unnecessarily, and to provide a door lock excellent in safety. Can be obtained.
[0008]
In the door lock according to the present invention, as a detent mechanism, the protrusion is provided on the push button, and includes a plurality of detent grooves provided on the outer periphery of the turn shaft. It is possible to adopt a configuration in which the protruding pieces are fitted into one to prevent the cover from rotating around the turn shaft.
[0009]
In the adoption of the detent mechanism as described above, a plurality of protrusions of the push button are fitted to the inner periphery of the shaft insertion hole into which the turn shaft of the bearing is inserted, while the push button is pressed outward. By forming the detent grooves at intervals in the circumferential direction, the cover can be held in a non-rotatable state by the engagement of the projecting piece and the detent groove on the bearing side in the released state of the push button. The safety of the lock can be further improved, and the relative positional relationship between the detent groove provided on the turn shaft and the protruding piece provided on the push button is kept constant. The operability can be improved by fitting into the non-rotating groove.
[0010]
Here, a fitting hole is provided on an end face of the cover, a display plate rotatably incorporated in the fitting hole is prevented from turning around a turn axis, and a display unit for displaying lock and unlock on the display plate is provided. With this arrangement, when the turn shaft rotates, the display plate also rotates, and it is possible to check whether or not the deadbolt is at the unlocked position by visually checking the display unit provided on the display plate.
[0011]
Here, if the display portion is a linear groove, the turn shaft can be rotated by engaging and rotating a driver or a coin in the linear groove, so that the parts of the cover such as the detent mechanism are damaged due to breakage of each part. The door lock can be unlocked even when the lock cannot be unlocked by rotation.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the rectangular lock case 1 has a front plate 2, and a pair of bolt insertion holes 3a and 3b are provided on the front plate 2 at the top and bottom, and dead holes are formed in the upper bolt insertion holes 3a. The bolt 4 is inserted, and the latch bolt 5 is inserted into the lower bolt insertion hole 3b.
[0013]
The lock case 1 is fitted into a concave portion (not shown) formed on the opening / closing side end surface of the door A, and is fixed to the door A by tightening screws 6 inserted into upper and lower portions of the front plate 2.
[0014]
On the other hand, a box-shaped receiving member C is attached to the vertical frame b of the door frame B at a position corresponding to the front plate 2, and a dead bolt 4 and a latch bolt are provided on a strike D provided at an opening of the receiving member C. 5 is provided with an engagement hole d that can be engaged.
[0015]
The latch bolt 5 is supported by the lower part of the lock case 1 and is protruded and retracted from the bolt insertion hole 3b by the swing operation of the operation levers 7 arranged on the outdoor side surface and the indoor side surface of the door A.
[0016]
As shown in FIG. 3, a cylinder cam 8 is provided on the upper inside of the lock case 1. The cylinder cam 8 is rotatably supported at a fixed position, and a pressing lever 9 is provided on the outer periphery thereof as shown by broken lines in FIGS. 4 (I) and (II) and FIG. The leading end of the pressing lever 9 faces between a protruding portion 10 formed at the upper end of the rear end of the dead bolt 4 and an end plate 11a of a U-shaped interlocking frame 11 provided at the rear end of the dead bolt 4, and the cylinder cam 8 When is rotated in the direction of the arrow in FIG. 1, the protruding portion 10 is pushed by the pressing lever 9, the dead bolt 4 advances, and the tip of the dead bolt 4 is engaged with the engaging hole d.
[0017]
On the other hand, when the cylinder cam 8 rotates in the direction opposite to the direction indicated by the arrow in FIG. 1, the end plate 11a of the interlocking frame 11 is pushed by the pressing lever 9, and the dead bolt 4 is retracted, and the tip end is moved from the engagement hole d. The dead bolt 4 moves forward and backward by a predetermined stroke in conjunction with the rotation of the cylinder cam 8.
[0018]
Here, the forward position where the tip of the dead bolt 4 engages with the engagement hole d is the locking position, and locks the door A in the closed position. On the other hand, the retracted position at which the tip of the dead bolt 4 comes out of the engagement hole d is the unlocked position, and the door A can be opened and closed by operating the operation lever 7.
[0019]
As shown in FIGS. 3 and 4, the cylinder cam 8 has a pair of end plates 8 a, and a pair of projecting portions 13 are provided at 180 ° intervals on the inner periphery of the engagement holes 12 formed in each end plate 8 a. Is provided.
[0020]
As shown in FIG. 3, a lock holder 14 is provided at an upper portion of one side of the lock case 1, and a bearing 15 is provided at an upper portion of the other side of the lock case 1.
[0021]
The lock holder 14 is connected to the lock case 1 in a state where one end thereof faces the inside from a fitting hole 16 formed in one side plate 1 a of the lock case 1. A cylinder lock 17 is supported by the lock holder 14, and a plate-shaped torque transmission piece 18 provided at the rear end of the cylinder lock 17 is inserted into one engagement hole 12 formed in the cylinder cam 8. Have been.
[0022]
The cylinder lock 17 has a key groove (not shown), and is rotated by a rotation operation of an operation key inserted into the key groove, and the rotation is transmitted to the cylinder cam 8 via a torque transmission piece 18.
[0023]
A connecting member 19 is connected to the rear end of the bearing 15 by screwing. The connecting member 19 is inserted into a fitting hole 20 formed in the other side plate 1 b of the lock case 1 and fixed to the lock case 1.
[0024]
A shaft insertion hole 21 is formed in the bearing 15 and the connection member 19 so as to penetrate both members, and a turn shaft 22 is inserted into the shaft insertion hole 21 and is rotatably supported.
[0025]
The turn shaft 22 has an engagement shaft portion 23 having a cross-shaped cross section at one end, and the engagement shaft portion 23 is inserted into the other engagement hole 12 of the cylinder cam 8 as shown in FIG. And is engaged with the projection 13. Therefore, when the turn shaft 22 rotates, the cylinder cam 8 also rotates.
[0026]
A cover 24 for rotating operation is fitted to the other end of the turn shaft 22. The cover 24 includes a cover main body 25, a guide block 26, and a connection cylinder 27. The cover main body 25 is provided with a rectangular space 28 that is open at the end face on the bearing 15 side, and the guide block 26 is incorporated in the space 28. Have been.
[0027]
As shown in FIG. 5, the guide block 26 has ridges 29 on both sides, and the ridges 29 are inserted into guide grooves 30 formed on both sides of the space 28 so that the guide block 26 is Prevents moving. The guide block 26 is provided with a support hole 31 for supporting the end of the turn shaft 22.
[0028]
As shown in FIG. 3, the connection cylinder 27 has a flange 32 at an end, and the flange 32 is abutted on the end face of the cover body 25 on the bearing 15 side, and is connected to the cover body 25 by screwing. .
[0029]
The connection cylinder 27 is rotatably fitted to the turn shaft 22 and is prevented from coming off by a flange 22 a provided on the turn shaft 22.
[0030]
As shown in FIGS. 3 and 7, a cylindrical outer surface 33 is formed on the cover body 25, and a plurality of fingertip engaging recesses 34 are provided on the cylindrical outer surface 33. Further, a button insertion hole 35 is formed in the cover body 25 so as to penetrate from the bottom surface of the fingertip engaging concave portion 34 at the upper periphery to the internal space 28, and a hemispherical push button 36 is slidably inserted into the button insertion hole 35. Has been inserted.
[0031]
The push button 36 has a rectangular pedestal 37 slidable in the space 28 of the cover main body 25, and a projection 38 is provided on one outer peripheral side of the pedestal 37.
[0032]
The push button 36 is provided with an outward projecting property by a spring 39 as an elastic body incorporated between the pedestal 37 and the guide block 26.
[0033]
As shown in FIGS. 3 and 6, the connection cylinder 27 is provided with an insertion hole 40 into which the protruding piece 38 of the push button 36 is inserted, while the inside of the hole 21 a of the bearing 15 into which the connection cylinder 27 is inserted. Four detent grooves 41 are formed around the circumference at 90 ° intervals.
[0034]
Further, on the outer circumference of the turn shaft 22, four detent grooves 42 are provided at 90 ° intervals on the outer circumference of a portion where the connection tube 27 is fitted.
[0035]
The protruding piece 38 of the push button 36 fits into the insertion hole 40 of the connection cylinder 27 and one of the detent grooves 41 of the bearing 15 in a state where the push button 36 is pressed outward by the spring 39, and the fitting covers the cover. Reference numeral 24 is detented by the bearing 15.
[0036]
When the push button 36 is pushed in, the protruding piece 38 is fitted into the insertion hole 40 and one of the detent grooves 42 of the turn shaft 22, and the fitting prevents the cover 24 from being rotated by the turn shaft 22.
[0037]
As shown in FIG. 3, a circular fitting hole 43 is formed in the end surface of the cover main body 25, and a circular display plate 44 is rotatably incorporated in the fitting hole 43. The display plate 44 is prevented from rotating around the end surface of the turn shaft 22 and rotates together with the turn shaft 22, and a display portion 45 formed of a linear groove is provided on the surface of the display plate 44.
[0038]
As shown in FIG. 1, the display unit 45 indicates that the dead bolt 4 is in the locked position in a vertically long state, and indicates that the dead bolt 4 is in an unlocked position in a horizontally long state.
[0039]
The door lock shown in the embodiment has the above-described structure, and FIG. 1 shows a locked state in which the tip of the dead bolt 4 is engaged with the engagement hole d of the strike D.
[0040]
When unlocking the door lock, the push button 36 is pushed in, the pressed state is maintained, and the cover 24 is rotated in the unlocking direction (the opposite direction indicated by the arrow in FIG. 1).
[0041]
Here, when the push button 36 is pushed in, the protrusion 38 provided on the push button 36 fits into one of the insertion holes 40 formed in the connection cylinder 27 and one of the four detent grooves 42 provided in the turn shaft 22. Then, the cover 24 is prevented from rotating around the turn shaft 22 by the fitting.
[0042]
When the cover 24 is rotated while the push button 36 is kept pressed, the turn shaft 22 rotates, and the rotation is transmitted to the cylinder cam 8 and the cylinder cam 8 also rotates in the same direction. At this time, the pressing lever 9 provided on the cylinder cam 8 presses the end plate 11a of the interlocking frame 11, so that the dead bolt 4 retreats and the tip comes out of the engaging hole d of the strike D, and the door lock is released. It is locked.
[0043]
In the unlocked state of the door lock, when the pressing of the push button 36 is released, the pressing of the spring 39 causes the push button 36 to move outward. The cover 24 is fitted to one of the four detent grooves 41 provided on the bearing 15, and the cover 24 is prevented from rotating with respect to the bearing 15. Therefore, even if a rotational force is applied to the cover 24, the cover 24 does not rotate, and the dead bolt 4 is held in the unlocked state.
[0044]
At the time of locking the door lock, the protrusion 38 is fitted into one of the four detent grooves 42 of the turn shaft 22 by pressing the push button 36 to lock the cover 24 on the turn shaft 22 as described above. Then, the cover 24 is rotated in the locking direction (the direction indicated by the arrow in FIG. 1) while the push button 36 is kept pressed. At this time, the projecting portion 10 is pressed by the pressing lever 9 of the cylinder cam 8 to which the rotation of the cover 24 is transmitted, and the dead bolt 4 advances, and the tip of the dead bolt 4 engages with the engagement hole d of the strike D. In this case, the door lock is locked.
[0045]
As described above, the locking and unlocking of the door lock requires two operations of pressing the push button 36 and rotating the cover 24 while keeping the push button 36 pressed.
[0046]
Therefore, even if a through hole is formed in the door by the drill and a wire is inserted into the through hole, the cover 24 cannot be rotated by the operation of the wire, and the door lock is unlocked by malicious mischief. Without this, a door lock excellent in safety can be obtained.
[0047]
Further, when the turn shaft 22 is rotated by the rotation of the cover 24, the display plate 44 stopped by the turn shaft 22 rotates together, and the display unit 45 provided on the display plate 44 is visually checked to lock the door. Can be checked whether the door is unlocked or locked, and the operation of checking whether the door is locked by opening and closing the door A can be omitted.
[0048]
【The invention's effect】
As described above, in the present invention, when the door is locked or unlocked, two operations of pushing the push button and rotating the cover in a state where the pushing is maintained are required. Even if the wire is inserted, the turn shaft interlocked with the dead bolt cannot be rotated, and a door lock excellent in safety can be obtained.
[0049]
In addition, since it is possible to confirm whether or not the door lock is locked by visually checking the display on the display plate that is prevented from rotating around the turn axis, the confirmation operation can be made unnecessary by opening and closing the door.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing an embodiment of a door lock according to the present invention. FIG. 2 is a left side view of the door lock shown in FIG. 1. FIG. 3 shows a main part of the door lock shown in FIG. FIG. 4 (I) and (II) are cross-sectional views showing the relationship between a dead bolt and a cylinder cam. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. 3 is a sectional view taken along the line VI-VI of FIG. 7; FIG. 7 is an exploded perspective view of each part shown in FIG. 3;
1 Lock case 4 Dead bolt 15 Bearing 21 Shaft insertion hole 22 Turn shaft 24 Cover 35 Button insertion hole 36 Push button 38 Protrusion piece 39 Spring (elastic body)
41, 42 Non-rotating groove 43 Fitting hole 44 Display plate 45 Display unit

Claims (5)

In a door lock in which a turn shaft is rotatably supported by a bearing protruding outward from a side plate of a lock case and a dead bolt is moved forward and backward by the rotation of the turn shaft, the door shaft is disposed outward from a bearing end surface of the turn shaft. A cover is rotatably fitted to the protruding end, a push button is slidably incorporated into a button insertion hole formed on the outer periphery of the cover, and an elastic body for pressing the push button outward is provided inside the cover. A door lock provided between the push button and the turn shaft, wherein a detent mechanism is provided between the push button and the turn shaft to prevent the cover from rotating around the turn shaft by pushing the push button. The detent mechanism comprises a projection provided on the push button and a plurality of detent grooves provided on the outer periphery of the turn shaft, and the projection is fitted into one of the detent grooves by pushing the push button. 2. The door lock according to claim 1, wherein the cover is prevented from rotating around the turn shaft. On the inner periphery of the shaft insertion hole into which the turn shaft of the bearing is inserted, a plurality of detent grooves into which the protruding pieces of the push button are fitted in the state where the push button is pressed outwardly are spaced circumferentially. 3. The door lock according to claim 2, wherein the door lock is formed. A cover provided with a fitting hole in an end face thereof, a display plate rotatably incorporated in the fitting hole is prevented from rotating around a turn shaft, and a display unit for displaying lock and unlock is provided on the display plate. Item 4. The door lock according to any one of Items 1 to 3. 5. The door lock according to claim 4, wherein the display section comprises a straight groove.

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