JPH0529324Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to a mechanism for preventing unlocking of a lock with a knob.
The present invention relates to a mechanism for preventing unauthorized opening of a lock by operating a knob in a lock that can be locked and unlocked by operating a knob without using a key.

<Prior Art> For crime prevention reasons, ordinary building locks are designed so that they cannot be locked or unlocked from the outside without a key. However, many locks are designed so that they can be locked or unlocked from the inside by simply moving a knob without using a key, making it easier to lock and unlock from the inside. Specific examples of such locks are described in, for example, Japanese Utility Model Publication No. 57-47326,
There is a structure disclosed in, for example, Japanese Utility Model Publication No. 58-10851.

However, in the case of the conventional knob lock described above,
Even from the outside, if a hole is drilled in the door or window glass and a hand is inserted, it is possible to operate the knob on the inside of the room, which could lead to unauthorized unlocking, posing a major security problem.

In order to prevent unauthorized opening of the lock, it would be possible to install a key on the inside of the room, but the structure of the lock would be very complicated and the cost would be high. , a key is required each time, which is extremely inconvenient and impractical.

<Purpose> Therefore, the purpose of this invention is to provide an unlocking prevention mechanism for a lock with a knob, which makes unauthorized unlocking impossible, further enhances the crime prevention effect, and is easy to handle.

<Structure> The structure for achieving the above purpose includes an engagement part provided on the operating member that moves up and down in conjunction with the locking/unlocking mechanism inside the locking device, and an engagement part provided at the tip of the engaging/disengaging shaft of the knob. In a lock in which the operating member is formed so as to be able to engage with each other and the operating member is operable by a knob, the knob is formed separately from the slide member that moves up and down on the front side of the lock device. The knob is formed to be detachable by inserting the fitting/removal shaft into the insertion hole of the slide member, and the slide member has a locking mechanism that locks onto a fixed part of the locking device to prevent movement of the slide member. By providing a locking member and inserting the insertion/removal shaft of the knob into the insertion hole of the slide member, when the locking member is pushed in the direction opposite to the biasing force, the locking device is fixed. The locking member is configured to be able to release the locking on the side, and the locking member is made of a locking spring formed by bending a wire rod. a substantially arc-shaped pushing part;
The lower end of the inverted U-shape is bent and extended inward at right angles, and the tip of the extended portion is formed to form a locking protrusion that projects outward, and the pushing part is arranged in the insertion path of the fitting/disengaging shaft of the knob, It is characterized in that the locking protrusion is formed so as to be able to engage with a locking groove formed in a fixed portion of the lock device.

<Example> Next, an example of this invention will be described below with reference to the drawings.

In the illustrated embodiment, as shown in FIG. 7, among the sickle locks for sliding doors, only a locking device A equipped with a locking/unlocking mechanism such as a sickle piece K is shown, which is attached to a sliding door D on the indoor side. There is. Therefore, although not shown, when in use, the sliding door on the outdoor side is attached to a locking device into which a key can be inserted, and the key is inserted into this locking device to lock and unlock the door. , the sickle piece K of the locking device A on the indoor side can be operated. However, the structure of the locking device on the outdoor side can be implemented with the same structure as a conventional known locking device, so a description thereof will be omitted.

In the lock device A shown in FIGS. 1 to 6, 1 is a back plate part attached to the outdoor side of the sliding door D, and 2 is a front plate part attached to the indoor side. Then, as shown in FIG. 7, the top plate part 2 and the back plate part 1 are installed from both sides of the mounting hole h formed in the sliding door D so that the sliding door D is sandwiched between them, and the screw holes 20 of the top plate part 2 are inserted. The inserted mounting screws B are screwed into the screw holes 10 of the back plate portion 1 for fixed attachment.

A sickle piece K that rotates toward the outdoor side is attached to the back plate portion 1, and reference numeral 11 is an operating member that moves up and down in conjunction with the sickle piece K. As the interlocking mechanism between the actuating member 11 and the sickle piece K, a structure similar to that of a conventional sickle lock is adopted, and a detailed explanation will be omitted.

A screw member 12 for mounting adjustment is screwed onto the vertical back surface of the actuating member 11.
A square hole 13 for engagement is formed in the center. Then, by adjusting the amount of screwing of the screw member 12 into the operating member 11 and appropriately setting the amount of protrusion of the screw member 12 from the back surface of the operating member 11, the square shaft of the knob and the square hole 13, which will be described later, are adjusted. The engagement position is adjustable. This screw member 1
With the configuration 2, even if the thickness of the sliding door D to be attached differs, the operating member 12 can always be operated reliably from the knob side by adjusting the setting of the amount of protrusion of the screw member 12, which is preferable.

Next, as will be explained in detail in FIG. A rectangular window portion 22 smaller than the sliding groove 21 is formed through the sliding groove 21, and a rectangular plate-shaped sliding member 3 is inserted and attached to the inside of the sliding groove 21 so as to be slidable in the vertical direction. The slide member 3 passes through the window portion 22 and is exposed to the front side.

Reference numeral 4 denotes a holding plate that closes the back side of the slide member 3. The holding plate 4 is screwed to the back side of the top plate portion 2, and is closed to prevent the ride member 3 from falling out of the sliding groove 21. There is. Further, a rectangular window portion 40 is formed through the center of the holding plate 4 so that a holding piece of a locking spring, which will be described later, slides therethrough.

The knob 5 is held and moved up and down to lock and unlock the lock.
A protruding portion 51 is formed on the front panel 2, and the removable shaft 50 of the knob 5 is inserted through the through hole 30 formed in the slide member 3 from the front side of the front plate 2 through the window 22, so that the slide member 3 can be moved up and down by the knob 5. Furthermore, the tip of the removable shaft 50 of the knob 5 is formed in a square rod shape, and this square shaft 51 is
The screw member 12 of the back plate 1 is fitted with a square hole 13 of the back plate 1.
They are formed to engage with each other, and by matching the square shaft 51 of the removable shaft 50 with the square hole 13 of the screw member 12, the operating member 11 can be operated up and down simultaneously with the slide member 3 by moving the knob 5.

Next, 6 is a locking spring serving as a locking member, which is formed by bending a single linear spring material,
The whole has an inverted U-shape, and a pushing part 60 is formed in the center of the left and right opposite sides, and is curved and bulged outward in a substantially arc shape. In addition, the lower end of the inverted U-shaped portion is bent and extended inward at a substantially right angle,
The tips of the extension portions extend beyond the center of the inverted U-shape, intersect with each other, and extend to the outside of the opposing sides on the opposite side, forming locking protrusions 61, 61, as shown in FIG. With the upper end of the inverted U-shape as a fulcrum, the pushing parts 60, 60 on opposite sides of the inverted U-shape are formed to be elastically expandable to the left and right. However, the left and right pushing parts 6
0 expands, the locking protrusions 6 intersect with each other.
1 and 61 move inward in the direction opposite to the biasing force.

Reference numeral 7 denotes a holding piece, which is screwed onto the slide member 3 from the back side of the locking spring 6, and is locked when the pushing part 60 of the locking spring 6 and the insertion hole 30 of the slide member 3 are concentric. Attach the spring 6. In addition,
The holding piece 7 has a recess 70 into which the locking spring 6 can be inserted.
The shape of the recess 70 substantially follows the outer shape of the locking spring 6, and has a gap or margin that allows the pushing part 60 and the locking protrusion 61 of the locking spring 6 to expand and move. The locking projection 61 of the locking spring 6 is formed so as to be able to protrude to the left and right outer sides of the presser piece 7. Further, the presser piece 7 is also formed with an insertion hole 71 through which the insertion/removal shaft 50 of the knob 5 passes. Then, with the presser piece 7 attached to the slide member 3, the presser piece 7 is inserted into the window 40 of the presser plate 4, so that the presser piece 7 can be slid up and down.

Next, locking grooves 23 are formed on the left and right side walls of the sliding groove 21 in the top plate portion 2, and locking grooves 23 are formed on the left and right side walls of the sliding groove 21.
Locking protrusions 61, 61 protruding left and right are inserted and locked into this locking groove 23. And the locking groove 23
The formation position of the locking protrusion 61 of the locking spring 6 attached to the slide member 3 interlocking with the operating member 11 corresponds to the movement position of the actuating member 11 when locking and unlocking, respectively. so that it can be locked in the position of
Locking grooves 23 are formed at two locations, upper and lower, corresponding to the locked and unlocked positions.

Further, in the above-mentioned fitting/dismounting shaft 50 of the knob 5, a small diameter portion 52 slightly recessed from the outer circumference is provided at a position where the pushing portion 60 of the locking spring 6 comes into contact when the knob 5 is inserted into the slide member 3. The outer diameter of this small diameter portion 52 is made wider than the distance between the left and right pushing parts 60, 60 of the locking spring 6, so that the locking spring 6 can be expanded laterally. It is formed like this. Then, the locking spring 6 is temporarily attached to the small diameter portion 52.
When it is fitted and locked, the outer circumference of the surrounding fitting/unfitting shaft 50 is higher than the small diameter part 52, so the locking spring 6 is difficult to come off, and the knob 5 attached to the slide member 3 is prevented from coming out naturally. It's summery.

The usage status of the lock explained above is shown in Figures 7 to 9.
Shown in the figure.

First, the back plate part 1 and the front plate part 2 are placed on both sides of the mounting hole h of the sliding door D, and are tightened and fixed with screws B. In this state, the knob 5 is not attached to the top plate portion 2. In addition, the amount of protrusion of the screw member 12 attached to the operating member 11 is adjusted in advance according to the thickness of the sliding door D, and the square shaft of the knob 5 is inserted into the square hole 13.
1, so that they can be reliably engaged.

Then, the sickle piece K on the back plate part 1 side is activated to perform unlocking and locking operations, but in order to lock and unlock from the sliding door on the outdoor side, insert the key into the locking device of the sliding door on the outdoor side. Then, operate the locking device A on the indoor side and lock the sickle piece K.
All you have to do is activate it, and you can use it in exactly the same way as a conventional sickle lock.

However, on the indoor side, the slide member 3 exposed on the front side of the top plate part 2 only has an insertion hole 30, and the knob 5 for operating the slide member 3 is not attached. is, sickle K
cannot be activated.

Further, inside the top plate portion 2, the tips of the locking protrusions 61, 61 of the locking spring 6 are fitted and locked into locking grooves 23 formed on the left and right side walls of the sliding groove 21. Therefore, even if force is applied to move the slide member 3 up and down, the locking protrusion 61 and the locking groove 2
Due to the locking action with 3, the slide member 3 cannot be moved.

Next, when locking and unlocking from the indoor side, slide the knob 5 up and down through the sliding member 3 of the top plate 2 and engaging the square hole 13 of the back plate 1. to operate the actuating member 11.

That is, the fitting/disengaging shaft 50 of the knob 5 is inserted through the window 22 of the top plate 2 into the insertion hole 30 of the slide member 3, the center of the pushing parts 60, 60 of the locking spring 6, and the insertion hole 71 of the presser piece 7. A square shaft 51 at the tip of the insertion/removal shaft 50
is fitted and locked into the square hole 13 of the screw member 12,
The small diameter portion 52 of the fitting/disengaging shaft 50 contacts the pushing portions 60, 60 of the locking spring 6. Then, the pushing portions 60, 60 of the locking spring 6 are pushed open left and right by the small diameter portion 52 of the fitting/disengaging shaft 50 in the opposite direction to the urging force, so that the lower end of the locking spring 6 is locked. Stop projections 61, 61
The tip moves inward from the locking groove 23 and hides inside the slide portion 3 and the presser piece 7, and the engagement between the locking protrusion 61 and the locking groove 23 is released.

Then, the slide member 3 becomes movable inside the sliding groove 21, and by holding the knob 5 and operating it up and down, the slide member 3 is moved up and down, and at the same time, it is engaged with the square shaft 51 of the knob 5. square hole 1
3 and the operating member 11 can be moved up and down, and the sickle piece K can be operated.

In addition, a pushing part 60 of the locking spring 6 is attached to a small diameter part 52 of the knob 5 that is smaller than the front and rear mating shafts 50.
, the knob 5 is restricted from moving back and forth, and is prevented from falling off during operation or from coming out of engagement between the small diameter portion 52 and the pushing portion 60.

After performing the locking or unlocking operation as described above, while elastically deforming the locking spring 6,
If the fitting/disengaging shaft 50 is pulled out and the knob 5 is pulled out from the top plate part 2, the small diameter part 52 of the knob 5 and the locking spring 6 are removed.
is disengaged from the pushing part 60, the distance between the left and right pushing parts 60, 60 narrows, and the tips of the locking protrusions 61, 61 protrude to the left and right, so that the locking groove 23
, and the slide member 3 is again prevented from moving.

Therefore, in the locking device A described above, from the indoor side, only when the knob 5 is attached to the top plate part 2,
When the lock can be operated and the knob 5 is removed, the slide member 3 for operating the lock is prevented from moving, so the lock cannot be operated.

Among the unlocking prevention mechanisms described above, the locking device A includes not only the illustrated sickle lock in which the sickle piece K is rotated, but also various ordinary types having a structure in which bolt members, latch members, etc. are protruded and actuated as appropriate. It is sufficient that locking mechanisms can be freely installed and these locking mechanisms are linked to the actuating member 11 that moves up and down. In addition, as shown in the figure, in addition to the structure in which the back plate part 1 and the front plate part 2 are formed separately and are attached by sandwiching them from both sides of the sliding door D, there is also a structure in which the entire lock device A is formed in one piece. However, it is doable.

In the illustrated embodiment, in order to interlock the operating member 11 of the back plate portion 1 and the knob 5 attached to the front plate portion 2 side, the square shaft 51 on the knob 5 side and the square hole 13 of the operating member 11 are connected to each other. However, as long as the knob 5 and the actuating member 11 can move together, it can be changed to various known engagement structures such as fitting concavities and convexities as appropriate.

Further, in the illustrated embodiment, the square hole 13 on the operating member 11 side is formed in the screw member 12, and the screw member 12
By adjusting the amount of screwing into the actuating member 11, the screw member 12 and the square hole 13 can be made to protrude freely, and the distance between the front plate part 2 and the back plate part 1 can be changed, that is, the thickness of the sliding door D can be changed. However, the square hole 13 can also be formed directly in the actuating member 11.

Next, in the top plate portion 2, as the locking spring 6 for regulating the movement of the slide member 3, the illustrated inverted U
Approximately arc-shaped pushing parts 60, 60 are provided at the center of the letter-shaped portion.
The lower ends of the inverted U-shape are bent inward and extended at right angles to intersect with each other, and locking projections 61, 61 are formed protruding from the tips of the locking projections 61, 61.
61 is engaged with the locking groove 23 of the top plate portion 2 to prevent the slide member 3 from moving, which is preferable because it has a simple structure and can operate reliably.

In addition, locks equipped with the unlocking prevention mechanism of this invention include locks that are operated using a key from the outdoor side and a knob from the outdoor side, as well as locks that are operated only from the outdoor side or the indoor side. It can also be applied to temporary locks that are operated with a knob and do not use a key at all.

<Effects> According to the unlocking prevention mechanism of this invention configured as described above, only when the knob 5 is attached to the locking device A, the locking/unlocking operation can be performed from the side to which the knob 5 is attached. Once the knob 5 is removed after locking, it becomes impossible to operate the lock from this side, so there is no need to worry about unauthorized unlocking, which is extremely effective in terms of crime prevention.

That is, inside the locking device A, the operating member 11, which moves horizontally in conjunction with the locking mechanism, and the knob 5, which is detachable from the locking device A, are connected to the square hole 13 on the operating member 11 side and the square shaft on the knob 5 side. 52 so that they can be engaged with each other, and the actuating member 11 can be operated by moving the knob 5.
On the front side of the locking device A, the knob 5 is attached, and the slide member 3 that moves horizontally together with the knob 5 is attached to a locking spring 6 as a locking member provided on the slide member 3.
and a locking groove 23 formed on the fixed part side of the locking device A.
If the knob 5 is not attached, the slide member 3 is prevented from moving by engaging with the operating member 11, the lock mechanism, etc. It is completely impossible to operate the lock from the front side, thus preventing unauthorized opening of the lock.

Then, when the knob 5 is attached to the locking device A, that is, the slide member 3, for example, the insertion/removal shaft 5 of the knob 5
The locking spring 6 can be unlocked by pushing the locking spring 6 at the small diameter portion 52 which is a part of the locking mechanism 0, and the slide member 3 becomes movable, allowing unlocking operation using the knob 5. It becomes.

Therefore, by simply removing the knob 5 from the locking device A, unauthorized lock operation is prevented. For example, for a sickle lock that locks externally, with the knob 5 attached on the indoor side, the lock of this invention can be opened. If a prevention mechanism is provided, locking/unlocking operations can normally be performed extremely easily by operating the knob 5.

However, if you remove the knob 5 after locking the door, it is possible to remove the knob 5, which is a common method for burglary in the past.
Even if a part of the door to which the lock is attached is broken and a hand is inserted from the outdoor side to operate the knob 5 on the indoor side, the door cannot be unlocked because the knob 5 is missing. In addition, even if you try to directly operate the slide member 3 with an appropriate tool, the movement of the slide member 3 is blocked, so you cannot operate it, and unauthorized opening of the lock can be completely prevented, which is extremely effective in preventing crime. It is excellent.

Moreover, in the unlocking prevention mechanism of this invention,
Regarding the locking mechanism part of the locking device A, the combination structure of the ordinary sickle piece K and the actuating member 11 can be adopted as is, and it is very flexible in that it can be easily applied to various conventional known lock structures. It also has excellent properties.

[Brief explanation of the drawing]

The figure shows an example of this invention.
The figure is a perspective view of the entire locking device, Figure 2 is an exploded perspective view of the top plate, Figure 3 is a front view of the knob, Figure 4 is a back view of the presser piece, and Figure 5 is the back side of the top plate. Fig. 6 is a front view of the main part with the presser plate and presser piece removed in the above figure, Fig. 7 is a sectional view of the operating state, Fig. 8 is a horizontal enlarged sectional view of the knob part, 9th
The figure is a front view of the locking spring portion. A...Lock device, k...Sickle piece, 1...Back plate part, 1
1... Operating member, 13... Square hole, 2... Top plate part,
21... Sliding groove, 23... Locking groove, 3... Slide member, 5... Knob, 50... Fitting/disengaging shaft, 51...
... Square shaft, 52 ... Small diameter part, 6 ... Locking spring, 60
... Pushing portion, 61 ... Locking protrusion.

Claims (1)

[Scope of utility model registration request] The actuating member is formed by forming an engaging part provided on the actuating member that moves up and down in conjunction with the locking/unlocking mechanism inside the lock device and an engaging part provided at the tip of the engaging/disengaging shaft of the knob so that they can engage with each other. In a lock that can be operated by a knob, a separately formed insertion/removal shaft of the knob is inserted into an insertion hole of the slide member, which moves up and down on the front side of the lock device. Therefore, the knob is formed to be detachable, and the slide member is provided with a locking member that locks onto a fixed portion of the locking device to prevent movement of the slide member,
By inserting the insertion/removal shaft of the knob into the insertion hole of the slide member, the lock on the fixed side of the locking device can be released when the locking member is pushed in the opposite direction to the urging force. Further, the locking member is a locking spring formed by bending a wire rod, and the locking spring includes a substantially arc-shaped pushing portion formed by curving outward the middle of the opposing sides of the inverted U-shape. and the lower end of the inverted U-shape is bent and extended inward at right angles,
A locking protrusion is formed with the tip of the extension portion protruding outward, the pushing part is placed in the insertion path of the fitting/uncoupling shaft of the knob, and the locking protrusion is placed in the locking groove formed in the fixed part of the locking device. An unlocking prevention mechanism for a lock with a knob, characterized in that it is formed to be engageable.