JP4170059B2 - Security thumb turn - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a security thumb turn attached later to cover an existing thumb turn used for a door locking / unlocking operation.
[0002]
[Prior art]
For example, a locking device provided on a door can be used to insert a dead key that has been advanced and retracted from the door end of the door by inserting a key into the keyhole of a cylinder lock that is exposed to the outside and turning it. Engage and disengage from the strike provided on the door to lock and unlock the door, and from the indoor side, simply rotate the thumb-turn knob to move the deadbolt forward and backward to easily lock and unlock the door. I am doing so.
[0003]
However, in recent years, there has been an increase in unauthorized unlocking that unlocks locking devices by inserting a rod or wire from a small hole opened by a post port or a machine tool, locking it to a thumb turn that is easy to rotate, and rotating it. Yes.
Prior art document information related to the invention of this application includes the following.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 4-40362 [0005]
For example, there is a thumb turn crime prevention cover disclosed in Patent Document 1 which prevents the thumb turn from being locked and rotated.
As shown in FIGS. 8 and 9, the security cover 1 has a fitting hole 3 into which the thumb turn 2 is fitted, and a portion covering the outer surface 2 a of the thumb turn 2 that draws a circular locus 2 b during rotation is circular. It is formed in a circular shape along the shape locus. Then, set screws 4 and 4 are provided which are screwed into the fitting holes 3 to come into contact with the side surfaces of the thumb turn 2 and are clamped from both sides.
[0006]
The security cover 1 having such a configuration is configured such that the thumb turn 2 is covered with the thumb turn 2 by inserting the thumb turn 2 into the insertion hole 3. Thereafter, the security cover 1 is fixed to the thumb turn 2 by screwing the set screws 4 and 4 into place. Therefore, it becomes difficult to lock the wire or the like by the crime prevention cover 1 placed on the thumb turn 2 and rotate it.
[0007]
Further, as another aspect of the above-described crime prevention cover, as shown in FIG. 10, a crime prevention cover 1 configured by an attachment portion 5 and a main body portion 6 is disclosed. The attachment portion 5 is formed so that the outer shape of the crime prevention cover 1 is easily operated by hand, and is provided with a locking projection 5a that the main body portion 6 locks. The mounting portion 5 can easily rotate the thumb turn 2 in a state where it is covered with the thumb turn 2. Moreover, the main-body part 6 has the latching | locking part 6a which can be latched to the latching protrusion 5a.
[0008]
By doing in this way, the crime prevention cover 1 can be attached or detached by a simple operation called a locking operation. Furthermore, when the main body 6 is idled by the locking portion 6a, it becomes impossible to lock and rotate the wire or the like.
[0009]
[Problems to be solved by the invention]
However, the security cover shown in FIGS. 8 and 9 has a thumb turn that covers the security cover by inserting the thumb turn into the insertion hole, so that the existing thumb turn has a T-shape or L-shape in plan view. In the case of the shape, the crime prevention cover becomes large and cannot be attached by interfering with the knob, so that the crime prevention property cannot be improved.
[0010]
Moreover, since the security cover shown in FIG. 10 is composed of a mounting portion that allows the thumb turn to rotate, and a main body portion that idles and is detachable with respect to this mounting portion, the security cover has been operated and detached. The storage management of the main body becomes complicated, and there is a possibility that the main body is lost.
[0011]
The present invention has been made in view of the above situation, and its first object is to provide a crime prevention thumb turn that can prevent rotation of the thumb turn by a wire, a rod, etc., and does not require a detachable member, thereby improving crime prevention. Is to plan. In addition, the second object is to provide a crime prevention thumb turn that can be mounted with a good appearance without interfering with the knob even if the existing thumb turn has a T-shaped or L-shaped lever shape in plan view, thereby improving the crime prevention performance. There is.
[0012]
[Means for Solving the Problems]
Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The crime prevention thumb turn 31 according to claim 1 of the present invention comprises a thumb turn attaching member 33 attached to the existing thumb turn 19,
A retrofit case 35 covering the lock box 13 protruding from the indoor surface 11a of the door 11 and exposing the existing thumb turn 19 on the surface together with the thumb turn attaching member 33;
A restricting plate 37 that is fixed to the retrofit case 35 and is disposed in a gap 59 between the existing thumb turn 19 at the locking position and the surface of the lock case 13 and restricts the dropout of the retrofit case 35 from the lock case 13; ,
A substantially columnar post-mount thumb turn fixed to the thumb turn adherence member 33 and fixed to the tip penetrating the post case 35 so as to be coaxial with the rotation center of the existing thumb turn 19;
It is characterized by comprising.
[0013]
In the crime prevention thumb turn 31, even if a wire, a rod, or the like is used, the rotational force input to the existing thumb turn 19 is blocked by the slip of the substantially cylindrical outer peripheral surface. And at the time of thumb-turn operation, it can pick up from an outer peripheral surface, and locking / unlocking operation becomes possible only by the same rotation operation as before. This eliminates the need for a detachable member and improves crime prevention and operability.
Then, the restriction plate 37 is inserted into the gap 59 between the lock box 13 and the existing thumb turn 19, so that it is not necessary to form a new screw hole in the lock box 13, and it is difficult to remove the retrofit case 35 in the locked state. And crime prevention is improved.
Further, since the thumb turn attaching member 33, the retrofit case 35, and the retrofit thumb turn are only attached to the existing lock device, the crime prevention property can be easily and inexpensively increased as compared with the case of replacing the lock device.
Furthermore, the existing thumb turn 19 is covered with the new retrofit case 35 and the retrofit thumb turn, the appearance of the existing lock device is improved, and the design is improved. And when moving out, only by removing, the attachment hole or the like is not left, and the original locking device is restored.
[0014]
The crime prevention thumb turn 31 according to claim 2 of the present invention comprises a thumb turn attaching member 33 attached to the existing thumb turn 19,
A retrofit case 35 covering the lock box 13 protruding from the indoor surface 11a of the door 11 and exposing the existing thumb turn 19 on the surface together with the thumb turn attaching member 33;
A restricting plate 37 that is fixed to the retrofit case 35 and is disposed in a gap 59 between the existing thumb turn 19 at the locking position and the surface of the lock case 13 and restricts the dropout of the retrofit case 35 from the lock case 13; ,
An operation disk 63 is fixed to the tip of the thumb turn adherence member 33 and penetrates the retrofit case 35 so as to be coaxial with the rotation center of the existing thumb turn 19, and a part of the operation disk 63 is represented. A retrofitting thumb turn 39 provided with a freely rotating idling member 65 that covers the operation disc 63.
It is characterized by comprising.
[0015]
In the crime prevention thumb turn 31, even if a wire, a rod, or the like is used, the operation disk 63 is prevented from slipping and the idling member 65 is prevented from being input to the existing thumb turn 19 due to idling. Then, during the thumb turn operation, the unlocking member 65 and the exposed operation disc 63 are picked, so that the locking / unlocking operation can be performed only by the conventional rotation operation. This eliminates the need for a detachable member and improves crime prevention and operability.
Then, the restriction plate 37 is inserted into the gap 59 between the lock box 13 and the existing thumb turn 19, so that it is not necessary to form a new screw hole in the lock box 13, and it is difficult to remove the retrofit case 35 in the locked state. And crime prevention is improved.
Further, since the thumb turn attaching member 33, the retrofit case 35, and the retrofit thumb turn 39 are only attached to the existing lock device, the crime prevention property can be easily and inexpensively increased as compared with the case of replacing the lock device.
Furthermore, the existing thumb turn 19 is covered with the new retrofit case 35 and the retrofit thumb turn 39, so that the appearance of the existing lock device is improved and the design is improved. And when moving out, only by removing, the attachment hole or the like is not left, and the original locking device is restored.
[0016]
The crime prevention thumb turn 31 according to claim 3 is the crime prevention thumb turn 31 according to claim 2,
An urging spring is provided between the thumb-turn adherence member 33 and the operation disc 63 so that the thumb-turn adherence member 33 and the operation disc 63 are separated from each other in the axial direction so that both can rotate relative to each other. And
Engagement means for engaging the thumb-turn attached member 33 and the operation disc 63 so as not to be relatively rotatable in a state where the operation disc 63 is pressed against the thumb-turn attached member 33 against the biasing spring. The thumb turn adhering member 33 and the operation disc 63 are formed.
[0017]
In this crime prevention thumb turn 31, in order to transmit the operating force of the retrofitted thumb turn 39 to the existing thumb turn 19, the retrofitting thumb turn 39 must be pushed and engaged with the thumb turn attaching member 33. Even if the user inserts a hand and tries to operate the post-attachment thumb turn 39 illegally, the user is forced to perform the rotation operation while pushing the post-attachment thumb turn 39, making the operation more difficult.
[0018]
The crime prevention thumb turn 31 according to claim 4 is the crime prevention thumb turn 31 according to claim 1, 2 or 3,
The existing thumb turn 19 has an operating collar portion 21 extending radially outward from the rotation center,
The retrofit case 35 has an existing thumb-turn housing portion 51 that protrudes in a shape that covers the rotation trajectory of the operating rod 21.
[0019]
In this crime prevention thumb turn 31, the retrofit case 35 has an existing thumb turn receiving portion 51 that covers the rotation trajectory of the existing thumb turn 19, so that it also looks nice with respect to the lever shaped thumb thumb 19 that is T-shaped or L-shaped in plan view. It can be installed well.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a security thumb turn according to the present invention will be described in detail with reference to the drawings.
1 is an exploded perspective view of a security thumb turn according to the present invention, FIG. 2 is a front view of the security thumb turn shown in FIG. 1, FIG. 3 is an AA arrow view of FIG. 2, and FIG. FIG. 5 is a front view of the retrofit case shown in FIG. 2, FIG. 6 is a cross sectional view taken along the line CC of FIG. 5, and FIG. 7 is a retrofit case shown in FIG. It is an exploded view showing the positional relationship.
[0021]
As shown in FIG. 1, a lock box 13 protrudes and is attached to the indoor surface 11 a of the door 11. In the present embodiment, the lock box 13 is formed in a flat cylindrical shape. The lock box 13 is provided with a latch bolt 15 and a dead bolt 17 shown in FIG. 2 and a lock box mechanism (not shown) for moving them back and forth. The dead bolt 17 is advanced and retracted from the side surface of the lock box 13 through the mechanism by rotating a cylinder lock (not shown) provided on the outdoor side surface of the door 11 with a key or by rotating an existing thumb turn 19 described later. . Further, the latch bolt 15 is advanced and retracted from the side surface of the lock box 13 through a mechanism portion by a rotation operation of a knob 23 described later. The dead bolts 17 and the latch bolts 15 protruding from the lock box 13 enter a strike and trolley provided on a door frame (not shown) to restrict the opening of the door 11.
[0022]
From the indoor side surface of the lock box 13, an existing thumb turn 19 that rotates around the central axis in the direction perpendicular to the surface protrudes. The existing thumb turn 19 has an L-shaped lever shape in plan view in which an operating rod portion 21 extends radially outward from the central axis. Note that the existing thumb turn 19 may have a T-shaped lever shape in plan view in which the operating rod portion 21 extends from the central axis outward in the diameter direction.
[0023]
Further, from the lock box 13, in the vicinity of the existing thumb turn 19, a knob 23 that rotates about the central axis in the same direction as the existing thumb turn 19 protrudes indoors and outdoors. The knob 23 has an L-shaped lever shape in plan view that extends radially outward from the central axis.
[0024]
Thus, the security thumb turn 31 according to the present embodiment is attached to the lock box 13 exposed on the indoor surface 11a of the door 11 from the indoor side. The security thumb turn 31 has a thumb turn attaching member 33, a retrofit case 35, a regulating plate 37, and a retrofit thumb turn 39 as basic components.
[0025]
The thumb turn attaching member 33 is formed in a substantially similar shape to the existing thumb turn 19 and has a fitting hole 41 shown in FIG. 3 into which the existing thumb turn 19 is fitted. Further, it has a mounting hole 43 (see FIG. 1) drilled coaxially with the central axis of the existing thumb turn 19, and as shown in FIG. 3, the post-attached thumb turn 39 is fixed by a screw 45 inserted into the mounting hole 43. It has come to be. The thumb turn attaching member 33 and the retrofitted thumb turn 39 are integrally fixed in advance so as not to rotate relative to each other by a screw 45 while passing through the retrofit case 35.
[0026]
A female screw 47 (see FIG. 1) penetrating through the fitting hole 41 is formed in the thumb turn attaching member 33, and a fixing screw 49 is screwed into the female screw 47. The thumb turn attaching member 33 is attached to the existing thumb turn 19 by fitting the existing thumb turn 19 into the fitting hole 41 and screwing the fixing screw 49 into the female screw 47. ing. Therefore, when the thumb turn attaching member 33 is attached to the existing thumb turn 19, the retrofit case 35 and the retrofit thumb turn 39 are attached at the same time. Note that the retrofit case 35 is attached to the lock box 13 side through the thumb turn attaching member 33, but is basically attached to the lock box 13 by the double-sided tape 50 attached to the lock box 13. .
[0027]
The retrofit case 35 covers the lock box 13 protruding from the indoor surface 11 a of the door 11 together with the thumb turn attaching member 33. In this retrofit case 35, an existing thumb turn accommodating portion 51 having a flat semi-cylindrical shape is formed so as to protrude from the surface of the retrofit case 35. The existing thumb turn accommodating portion 51 is formed in a semicircular shape that covers the operation lever portion 21 of the existing thumb turn 19, that is, the rotation trajectory of the thumb turn attached member 33. Thereby, the thumb turn attaching member 33 is housed in the existing thumb turn housing 51 so as to be rotatable from the unlocked position to the locked position.
[0028]
In this way, in the crime prevention thumb turn 31, since the retrofitted case 35 has the existing thumb turn accommodating portion 51 that covers the rotation trajectory of the existing thumb turn 19, the lever-shaped existing thumb turn 19 that is T-shaped or L-shaped in plan view is used. But it can be installed nicely.
[0029]
Further, as shown in FIG. 4, the retrofit case 35 has a notch 53 for exposing the dead bolt 17 and the latch bolt 15. Further, as shown in FIGS. 5 and 6, the retrofit case 35 has a knob hole 55 for allowing the knob 23 to pass therethrough. The knob hole 55 is formed in the case main body portion 35 a of the retrofit case 35. The case thumb 35a is provided with the above-described existing thumb turn accommodating portion 51 in a protruding manner. As shown in FIG. 6, a screw rotation hole 57 is formed on one side surface of the existing thumb turn accommodating part 51 protruding from the case main body part 35 a. The screw turning hole 57 is screwed by a tool with respect to the fixing screw 49 in a state in which the thumb turn attaching member 33 attached to the existing thumb turn 19 is in the unlocked posture (the posture in which the longitudinal direction is the vertical direction). It enables wearing / unscrewing.
[0030]
The restricting plate 37 is fixed to the back surface of the retrofit case 35 opposite to the knob hole 55. This fixing is performed by a fixing means such as a screw or an adhesive (not shown) in advance before attaching the retrofit case 35 to the lock box 13. As shown in FIGS. 1 and 7, the restricting plate 37 is disposed in a gap 59 between the existing thumb turn 19 and thumb turn attached member 33 in the locked position and the surface of the lock box 13, so that the lock box of the retrofit case 35 is provided. Dropping from 13 is regulated. That is, a space portion is formed in the retrofit case 35 by the restriction plate 37, and the restriction plate 37 is inserted into the gap 59 between the lock box 13 and the existing thumb turn 19, making it difficult to remove the retrofit case 35 in the locked state. It is becoming crime prevention.
[0031]
The retrofitting thumb turn 39 in the present embodiment includes a rotating shaft 61 shown in FIG. 3, an operation disk 63 fixed to the rotating shaft 61, and an idling member 65. The rotating shaft 61 is inserted into a through hole 67 formed in the existing thumb turn accommodating portion 51 and screwed to the screw 45 penetrating the thumb turn attached member 33. That is, the thumb turn attaching member 33, the retrofit case 35, and the retrofit thumb turn 39 are assembled together in advance.
[0032]
The retrofitting thumb turn 39 is fixed to the thumb turn attaching member 33 so as to be coaxial with the rotation center of the existing thumb turn 19, and an operation disk 63 is fixed to the tip penetrating the retrofitting case 35. The idling member 65 is formed with an outer diameter larger than that of the operation disk 63 and is rotatable about the rotation shaft 61 with the operation disk 63 sandwiched from the front and back sides, and as shown in FIG. It has the window part 69 to expose.
[0033]
Next, the operation of the security thumb turn 31 according to the present embodiment will be described.
First, the case of locking from the indoor side will be described.
An operator picks the idling member 65 from the inside. At this time, the picked finger also picks the peripheral edge 63a of the operation disc 63 exposed from the window portion 69 at the same time.
[0034]
When the picked hand is twisted and the operation disk 63 is rotated, for example, clockwise, the thumb turn attaching member 33 and the existing thumb turn 19 are also rotated accordingly. Then, for example, when it is turned 90 degrees, the inside of the lock box mechanism is operated by the existing thumb turn 19 and the dead bolt 17 advances to the side of the lock box 13. Thereby, the door 11 is locked from the indoor side.
[0035]
At the time of locking, when a small window provided in the door 11 or the like is split or a wire is inserted from the gap between the door 11 and the door frame to try to illegally operate the retrofitting security thumb turn 31 from the outside, Even if it is intended to be locked, the wire is slid in the circumferential direction because it has a disk shape and can be locked.
[0036]
Further, even if the wire is locked to the window portion 69, the idle member 65 itself is rotatable, so the idle member 65 only idles, and the operation disk 63 cannot be rotated, and the dead bolt 17 will not advance or retreat. Therefore, unauthorized unlocking can be prevented.
[0037]
When unlocking from the locked state, the idle member 65 is picked and the peripheral edge 63a of the operation disk 63 exposed from the window 69 is picked. When the operation disk 63 is rotated in the counterclockwise direction, the thumb-turn attaching member 33 and the existing thumb-turn 19 are rotated accordingly. When the operation disk 63 is rotated 90 degrees, the inside of the lock box mechanism is operated by the existing thumb turn 19, and the dead bolt 17 protruding from the end of the lock box 13 is retracted into the lock box 13.
[0038]
As described above, according to the above-described crime prevention thumb turn 31, even if a wire, a rod, or the like is used, the operation disk 63 is slipped and the idling member 65 is prevented from inputting rotational force to the existing thumb turn 19 due to idle rotation. Then, when the existing thumb turn 19 is operated, the unlocking member 65 and the exposed operation disk 63 are picked, so that the locking / unlocking operation can be performed only by the conventional rotation operation. This eliminates the need for a detachable member and improves crime prevention and operability.
[0039]
In addition to this, since the existing thumb turn accommodating portion 51 formed in a shape covering the rotation trajectory of the existing thumb turn 19 is provided in the retrofit case 35, the existing thumb turn 19 is a lever shape having a T shape or an L shape in plan view. Even if it exists, it can be attached and the conventional crime prevention cover becomes large, so that it does not interfere with the knob and cannot be attached.
[0040]
Since the restriction plate 37 is inserted into the gap 59 between the lock box 13 and the existing thumb turn 19, it is difficult to remove the retrofit case 35 in the locked state, and the crime prevention performance is improved.
[0041]
Further, since the thumb turn attaching member 33, the retrofit case 35, and the retrofit thumb turn 39 are only attached to the existing lock device, the crime prevention property can be easily and inexpensively increased as compared with the case of replacing the lock device.
[0042]
Furthermore, since the existing thumb turn 19 is covered with the new retrofit case 35 and the retrofit thumb turn 39, the appearance of the existing lock device is improved and the design is improved. And, when leaving, the original locking device can be easily restored without removing the attachment hole or the like only by removing it.
[0043]
As a modification of the above-described embodiment, the crime prevention thumb turn 31 according to the present invention, when it is desired to rotate the existing thumb turn 19, presses the rear thumb turn 39 by hand, and rotates the rear thumb turn 39 in this state. Thus, the existing thumb turn 19 may be rotated.
[0044]
In this case, the configuration is such that an energizing spring (not shown) that allows the thumb-turn attaching member 33 and the operation disc 63 to move away from each other in the axial direction to relatively rotate both, and the thumb-turn attaching member 33 and the operation circle. It is arranged between the plate 63 and the thumb turn member 33 and the operation disc 63 are engaged with each other so that they cannot rotate relative to each other while the operation disc 63 is pressed against the thumb turn member 33 against the biasing spring. The engaging means (not shown) to be formed can be realized by forming the thumb-turn attaching member 33 and the operation disc 63.
[0045]
According to this configuration, in order to transmit the operating force of the retrofitting thumb turn 39 to the existing thumb turn 19, the retrofitting thumb turn 39 must be pushed to engage the thumb turn attachment member 33. Even if the user inserts a hand and tries to operate the post-attachment thumb turn 39 illegally, the user is forced to perform the rotation operation while pushing the post-attachment thumb turn 39, making the operation more difficult.
[0046]
In the above-described embodiment, the structure of the retrofitted thumb turn is composed of the operation disk 63 and the idling member 65, and a structural example is described in which crime prevention is obtained by causing idling to an unauthorized operation. As a configuration of this retrofitted thumb turn, it may be configured as a substantially cylindrical member, or may be configured such that the tip of the cylindrical portion is formed in a spherical shape. With such a configuration, even if an illegal operation is performed using a wire, a rod, or the like, the outer peripheral surface slips, and the input of the rotational force is prevented. And it becomes possible to obtain the crime prevention property similar to the said embodiment.
[0047]
Furthermore, in the above-described embodiment, the example in which the shape of the lock box 13 is formed in a flat columnar shape and the shape of the retrofit case 35 is substantially the same outer shape has been described. The shape of the retrofit case 35 may be changed to other shapes as well.
[0048]
Further, in the above-described embodiment, the example in which the knob 23 has a substantially L-shaped lever shape in plan view extending radially outward from the central axis has been described. However, as a normal substantially cylindrical knob, Even if configured, the same effect as described above can be obtained.
[0049]
【The invention's effect】
As described above, according to the crime prevention thumb turn according to claim 1 of the present invention, the thumb turn adherent member is attached to the existing thumb turn, the lock case is covered with the thumb turn adherent member by the retrofit case, and the fallback case is dropped. Since a restricting plate that restricts the movement is provided in the retrofit case and a substantially cylindrical retrofit thumb turn fixed to the tip penetrating the retrofit case is provided, even if a wire or a rod is used, slippage of the substantially cylindrical outer peripheral surface It is possible to prevent the rotational force from being input to the existing thumb turn. And at the time of thumb turn operation, it can be locked / unlocked only by the same rotational operation by picking from the outer peripheral surface. As a result, the detachable member is unnecessary, and the crime prevention property and operability can be improved.
And since the regulating plate is inserted into the gap between the lock box and the existing thumb turn, it is not necessary to form a new screw hole in the lock box, and it is difficult to remove the retrofit case in the locked state, thereby improving the crime prevention. be able to.
Moreover, since only the thumb turn attaching member, the retrofit case, and the retrofit thumb turn are attached to the existing lock device, the crime prevention property can be easily increased at a lower cost than when the lock device is replaced.
Furthermore, since the existing thumb turn can be covered with a new retrofit case or retrofit thumb turn, the appearance of the existing lock device can be improved and the design can be improved. And when leaving the house, the original lock device can be restored by simply removing it without leaving an attachment hole or the like.
[0050]
According to the crime prevention thumb turn according to claim 2, the thumb turn attaching member is attached to the existing thumb turn, the lock case is covered together with the thumb turn attaching member by the retrofit case, and the regulation plate for restricting the fall off of the retrofit case is provided in the retrofit case. Since the operation disk is fixed to the tip that penetrates the retrofit case, and a retrofitting thumb turn that covers a part of the operation disk and covers it with an idling member is provided, the operation disk can be used even if a wire or a rod is used. The slipping member and the idling member can prevent the rotational force from being input to the existing thumb turn due to the idling. And at the time of thumb turn operation, it can be locked / unlocked by only rotating operation as in the prior art by picking the operation disk exposed together with the idling member. As a result, the detachable member is unnecessary, and the crime prevention property and operability can be improved.
And since the regulating plate is inserted into the gap between the lock box and the existing thumb turn, it is not necessary to form a new screw hole in the lock box, and it is difficult to remove the retrofit case in the locked state, thereby improving the crime prevention. be able to.
Moreover, since only the thumb turn attaching member, the retrofit case, and the retrofit thumb turn are attached to the existing lock device, the crime prevention property can be easily increased at a lower cost than when the lock device is replaced.
Furthermore, since the existing thumb turn can be covered with a new retrofit case or retrofit thumb turn, the appearance of the existing lock device can be improved and the design can be improved. And when leaving the house, the original lock device can be restored by simply removing it without leaving an attachment hole or the like.
[0051]
According to the crime prevention thumb turn according to claim 3, the biasing spring which makes the thumb turn attaching member and the operation disk separated from each other and relatively rotatable is disposed between the thumb turn attaching member and the operation disk, An engagement means for engaging the thumb-turn adherence member and the operation disc in a relatively non-rotatable manner with the operation disc pressed against the thumb-turn adhering member against the biasing spring, the thumb-turn adherence member and the operation disc In order to transmit the operating force of the retrofitted thumb turn to the existing thumb turn, it is necessary to push the retrofitted thumb turn and engage the retrofitted thumb turn with the thumb turn attached member. Even if the user inserts a hand and tries to operate the retrofitted thumb turn illegally, the user is forced to perform the rotary operation while pushing the retrofitted thumb turn, so that the illegal operation can be made more difficult.
[0052]
According to the crime prevention thumb turn of the fourth aspect, the existing thumb turn has the operation collar portion extending radially outward from the rotation center, and the retrofit case is provided so as to project the shape of the rotation locus of the operation collar portion. Since the existing thumb-turn housing portion is provided, it can be attached to the lever-shaped existing thumb turn that is T-shaped or L-shaped in plan view.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a security thumb turn according to the present invention.
2 is a front view of the security thumb turn shown in FIG. 1. FIG.
FIG. 3 is a view taken along arrow AA in FIG. 2;
4 is a BB arrow view of FIG. 2;
5 is a front view of the retrofit case shown in FIG. 2. FIG.
6 is a view taken along the line CC of FIG. 5;
7 is an exploded view showing the positional relationship between the retrofit case, the thumb turn attaching member and the regulating plate shown in FIG. 1; FIG.
FIG. 8 is a perspective view showing a state in which a conventional crime prevention cover is attached to a door.
9 is a cross-sectional view showing an internal state of the crime prevention cover shown in FIG.
10 is a partially cutaway side view showing another aspect of the security cover shown in FIG. 8. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Door 11a ... Indoor surface 13 ... Lock box 19 ... Existing thumb turn 21 ... Operation collar 31 ... Security thumb turn 33 ... Thumb turn attachment member 35 ... Retrofit case 37 ... Restriction board 39 ... Retrofitting thumb turn 51 ... Existing thumb turn accommodation part 59 ... Gap 63 ... Operation disk 65 ... Idle member

Claims (4)

A thumb turn member to be attached to an existing thumb turn;
A lock case that protrudes from the indoor surface of the door and exposes the existing thumb turn on the surface, and a retrofit case that covers the thumb turn attaching member;
A regulating plate that is fixed to the retrofit case and is disposed in a gap between the existing thumbturn at the locking position and the surface of the lockbox, and restricts the fallback of the retrofit case from the lockbox;
A substantially cylindrical post-mount thumb turn fixed to the thumb turn adherent member so as to be coaxial with the rotation center of the existing thumb turn and fixed to the tip penetrating the post case;
Crime prevention thumb turn characterized by comprising. A thumb turn member to be attached to an existing thumb turn;
A lock case that protrudes from the indoor surface of the door and exposes the existing thumb turn on the surface, and a retrofit case that covers the thumb turn attaching member;
A regulating plate that is fixed to the retrofit case and is disposed in a gap between the existing thumbturn at the locking position and the surface of the lockbox, and restricts the fallback of the retrofit case from the lockbox;
An operation disk is fixed to the tip of the thumb turn adherent member and penetrates the retrofit case so as to be coaxial with the rotation center of the existing thumb turn, and a part of the operation disk is exposed to perform the operation. A retrofitted thumb turn with a freely rotating idling member covering the disc,
Crime prevention thumb turn characterized by comprising. In the crime prevention thumb turn according to claim 2,
An urging spring that displaces the thumb-turn adhering member and the operation disc in the axial direction and relatively rotates both is disposed between the thumb-turn adhering member and the operation disc.
Engaging means for engaging the thumb turn adherence member and the operation disc in a relatively non-rotatable manner with the operation disc pressed against the thumb turn adherence member against the biasing spring, A security thumb turn formed over a landing member and the operation disk. In the crime prevention thumb turn according to claim 1, 2 or 3,
The existing thumb turn has an operating collar extending radially outward from the rotation center,
The crime prevention thumb turn characterized in that the retrofitting case has an existing thumb turn housing part projecting in a shape covering the rotation trajectory of the operation lever part.

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