JP4167821B2 - Cylinder lock keyhole shutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyhole shutter (hereinafter simply referred to as a shutter) of a cylinder lock used for a door of a building.
[0002]
[Prior art]
Generally, a shutter for opening and closing a keyhole is not provided in a door lock of a building entrance.
[0003]
The main reason is that it was difficult to incorporate a keyhole shutter into a small cylinder lock, although the doorway is under the eaves of the entrance and can usually prevent rain and snow from entering. That is why.
[0004]
On the other hand, recently, crimes called picking have frequently occurred in the door locks at the entrances and exits of buildings, resulting in tremendous damage.
[0005]
[Problems to be solved by the invention]
With regard to the cylinder lock at the door opening, even if rain does not enter the keyhole directly, it is often experienced that dust will enter the cylinder lock and the movement of the tumbler will be aggravated by long-term use. is there.
[0006]
Also, now that picking damage has increased, the development of a cylinder lock that can effectively prevent picking is desired.
[0007]
Accordingly, an object of the present invention is to provide a shutter that does not allow dust to enter the cylinder lock, to guarantee stable operation of the cylinder lock for a long period of time, and to effectively resist picking.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a cup shape as a whole, a cylinder cylinder that is attached to the outer surface of the door with the outer plate that is the bottom plate of the cup as the outside, and an inner opening that is open to the outer plate. The key stem is inserted in the center with a cylinder lock built in the cylinder cylinder with the tip of the inner cylinder inserted into the cylinder insertion hole and a shallow cup-shaped member disposed outside the cylinder cylinder. In addition to forming a sufficiently large opening, forming a circular inner recess on the back side, with the shallow cup opening on the outside, and inserting the tip of the cylinder lock cylinder into the inner recess , key and keyway, or by spline method or the like, and a holder coupled to the inner cylinder is constrained to the inner cylinder and the circumferential direction of the cylinder lock, which is fitted to the outside of the outer peripheral surface of the outer plate and the holder decoration And is symmetrical with each other in the holder. The plate-like blades are attached so as to be openable and closable with a surface parallel to the key hole of the inner cylinder or inclined at 30 ° as an engagement / disengagement surface, and the pair of engagement / disengagement surfaces are urged in a direction to be joined to each other. The front surface of the two blades is characterized in that a concave portion having a conical shape is formed in a normal state where the blades are closed.
[0009]
【Example】
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
As shown in FIG. 1, the cylinder lock 1 is usually attached to a lock box 3 via a cylinder cylinder 2.
[0010]
The cylinder cylinder 2 is, for example, a cup-shaped member having a pair of connecting pieces 4 projecting outside the opening edge, and each connecting piece 4 has an attachment hole 5 penetrating horizontally.
[0011]
Then, the cylinder lock 1 is housed in a state in which the inner cylinder 8 is viewed from the inner cylinder insertion hole 7 opened in the outer plate 6 (bottom plate of the cup) of the cylinder cylinder, and the retaining cylinder 9 is used to prevent the cylinder cylinder 2 from coming off. Is protruded outside through the side surface of the lock box 3 and the door 11.
[0012]
The opening edge of the cylinder cylinder 2 remaining in the lock box 3 is carried by the lock box 3 via mounting rods 12 and 12 that horizontally penetrate the attachment holes 5 of the connecting pieces.
[0013]
The mounting bar 12 is mounted so as to penetrate the lock box 3, and both ends thereof are carried by the lock box.
[0014]
In the figure, reference numeral 13 denotes a decorative ring having a perforated trapezoidal appearance, and this decorative ring 13 is usually formed by the elasticity of a ring spring 14 as a compression coil spring wound around the outer periphery of a cylinder cylinder. The opening base is mounted so as to be pressed against the outer surface of the door 11.
[0015]
A holder 15 is attached to the outer side of the outer plate 6 of the cylinder cylinder 2 (toward the left side) so as to be rotatable integrally with the inner cylinder 8.
[0016]
The holder 15 is a shallow cup-shaped member, and a circular inner recess 16 is formed on the back surface, and the tip of the inner cylinder is inserted, and the holder 15 and the inner cylinder 8 are connected to each other by a key and key groove or a spline method. Are connected to each other in a circumferential direction.
[0017]
Further, as shown in FIG. 2, an outer concave portion 17 is formed on the front surface of the holder to accommodate blades 21 and 22 of the shutter 20 described later.
[0018]
Furthermore, an opening 18 large enough to insert the key stem 40 is formed in the center of the holder 15 so as to connect the inner and outer recesses 16 and 17.
[0019]
On the other hand, the shutter 20 is composed of two thick plate-like blades 21 and 21 (see FIGS. 2, 3 and 4).
[0020]
Each blade 21 is a blade having a shape similar to a blade of a lens shutter having an arcuate outer surface 22 and a linear engagement / disengagement surface 23, and a conical recess having the center of the engagement / disengagement surface 23 as a vertex on the surface. 24 is formed to guide the insertion of the key stem (see FIG. 4).
[0021]
In addition, the direction of the engagement / disengagement surface 23 in the normal state where the shutter is closed can be easily understood by comparing FIG. 2 and FIG. 3. The engagement / disengagement surface 23 is opposite to the horizontal long side of the keyhole 41. It is inclined at an angle of about 15 degrees clockwise.
[0022]
Furthermore, a pin 25 protrudes from the rear side of the base end of each blade 21 and is fitted in a hole formed at one end of the holder. Therefore, each blade 21 rotates around the pin 25. It is supported so that it can move.
[0023]
In addition, an arc-shaped recess is formed at the base of each blade 21, for example, like a rotary disc tumbler. One end of a leaf spring 26 is attached to the recess, and the other end is formed on the inner surface of the recess 17 of the holder. It is in pressure contact.
[0024]
Due to the elasticity of the leaf spring 26, each blade 21 is urged counterclockwise in the drawing, that is, in a direction in which the pair of engaging / disengaging surfaces 23, 23 are in elastic contact with each other. Is closed (see FIG. 2).
[0025]
On the other hand, a thin cup-shaped decorative cylinder 32 is fitted to the outside of the outer peripheral surface of the outer plate 6 and the holder 15 via a spacer ring 31, and the vanes are prevented from falling off by this decorative cylinder 32. In addition, an opening 33 having a size sufficient for inserting the key stem 40 is formed at the center of the bottom surface of the decorative cylinder 32.
[0026]
The spacer ring 31 and the base 32 of the decorative cylinder are fixed to the outer peripheral surface of the cylinder cylinder 2 by caulking as shown by reference numeral 34.
[0027]
In the shutter according to the embodiment of the present invention configured as described above, in the normal state in which the shutter 20 does not insert the key stem 40, the engagement / disengagement surfaces 23 of the blades are in elastic contact with each other as shown in FIG. Closed in a state to prevent intrusion of rain, snow, dust, etc. from the outside.
[0028]
Here, as shown in FIG. 1, when the direction of the key stem 40 is aligned with the key hole 41 of the inner cylinder 8 and pushed in the direction indicated by the arrow, the tip of the stem is moved as shown in FIGS. 7 and 8. A horizontal component is generated by the wedge action generated between the two in contact with the conical recess 24.
[0029]
Due to this horizontal component force, each blade 21 is rotated clockwise around the pin 25 against the elasticity of the leaf spring 26, and the shutter is opened, and the stem is inserted into the key hole 41. Is done.
[0030]
When the stem 40 is inserted into the shutter, the engagement / disengagement surface 23 of the blade is substantially parallel to the direction of the stem 40 or the key hole 41, so that the insertion of the stem is easy.
[0031]
Here, when the key stem is rotated, both the inner cylinder and the shutter are rotated, and the tailpiece 19 is also rotated to perform the locking / unlocking operation.
[0032]
On the other hand, when trying to unlock this cylinder lock with a shutter by so-called picking, a thin tool for operating the tumbler from a small key hole and a tool for urging the inner cylinder in a certain direction are inserted, Picking is very difficult because it requires a tool or operation that keeps the blades open.
[0033]
On the other hand, considering the relationship between the direction of the engagement / disengagement surface 23 of the blade 21 and the key hole 41, in FIG. 9, the engagement / disengagement surface 23 is parallel to the key hole 41, and in FIG. In FIG. 13, the engagement / disengagement surface is formed to be inclined 15 degrees clockwise with respect to the keyhole.
[0034]
In the case shown in FIG. 9, there is an advantage that the insertion of the stem is easy because the inclined surface and the keyhole are parallel, but when the blades 21 and 21 are opened as shown in FIG. In order to incline clockwise with respect to the hole, it is necessary to increase the rotation angle of the blade.
[0035]
On the other hand, in the case shown in FIG. 11, the engagement / disengagement surface is greatly inclined with respect to the keyhole, so that the insertion of the stem is difficult as compared with the case of FIG. 9, and the blades as shown in FIG. When the is opened, the opening of the blade is formed to be inclined counterclockwise with respect to the key hole, so that the rotation angle of the blade needs to be increased.
[0036]
Further, in the case shown in FIG. 13, the engaging / disengaging surface 23 is inclined about 15 degrees counterclockwise with respect to the key hole 41, so that the insertion of the stem is somewhat difficult as compared with the case of FIG. As shown in FIG. 14, when the blade is opened, the opening of the blade is parallel to the keyhole, so that the rotation angle of the blade can be minimized.
[0037]
Accordingly, the case shown in FIG. 13 is practically optimal, but experiments have shown that the parallel case shown in FIG. 9 and the case tilted by 30 degrees shown in FIG. 13 can be practically used.
[0038]
【The invention's effect】
As is apparent from the above description, in the present invention, an openable / closable shutter consisting of two blades is attached to the front surface of the inner cylinder of the cylinder lock. It is possible to prevent intrusion and to make it difficult to perform unauthorized unlocking by picking, which has been frequently occurring recently.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a cylinder lock provided with a shutter according to an embodiment of the present invention.
FIG. 2 is a front view of the shutter shown with a decorative cylinder removed, showing a state in which the shutter is closed.
FIG. 3 is a front view of a shutter similar to that in FIG. 2 and shows a state in which the shutter is opened.
FIG. 4 is an external perspective view of shutter blades.
FIG. 5 is a front view of the cylinder lock, showing a state where the shutter is closed.
6 is a front view of a cylinder lock similar to FIG. 5, showing a state in which the shutter is opened. FIG.
FIG. 7 is an explanatory view showing a state where a key stem is inserted into a shutter.
8 is the same explanatory diagram as FIG.
FIG. 9 is a diagrammatic explanatory view showing the relationship between the direction of the engagement / disengagement surface of the shutter blade and the keyhole according to another embodiment of the present invention, and shows a state in which the shutter is closed.
FIG. 10 is a diagrammatic explanatory view similar to FIG. 9, showing a state in which the shutter is open.
FIG. 11 is a diagrammatic view showing the relationship between the direction of the engagement and disengagement surface of the shutter blade and the keyhole according to still another embodiment of the present invention, and shows a state where the shutter is closed.
12 is a diagrammatic explanatory view similar to FIG. 11, showing a state in which the shutter is open.
FIG. 13 is a diagrammatic explanatory view showing the relationship between the direction of engagement and disengagement of the blades of the shutter and the keyhole according to another embodiment of the present invention, showing a state in which the shutter is closed.
FIG. 14 is a diagrammatic explanatory view similar to FIG. 13, showing a state in which the shutter is open.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder lock 2 Cylinder cylinder 3 Lock box 6 Outer plate 8 Inner cylinder 15 Holder 16 Inner recessed part 17 Outer recessed part 20 Shutter 21 Blade 23 Engagement / disengagement surface 24 Recessed part 25 Pin 26 Leaf spring 40 Stem 41 Key hole

Claims (1)

The overall shape is cup-shaped, and the tip of the inner cylinder is inserted into the cylinder cylinder that is attached to the outer surface of the door with the outer plate that is the bottom plate of the cup facing outside, and the inner cylinder insertion hole that opens in the outer plate. With a cylinder lock built in the cylinder cylinder in a state and a shallow cup-shaped member disposed outside the cylinder cylinder, an opening large enough to be inserted into the center of the key stem is formed . A cylinder with a key and keyway, or a spline method, with a circular inner recess formed on the back side, with the shallow cup opening on the outside, and the tip of the cylinder lock inner cylinder inserted into the inner recess. An inner cylinder of the lock, a holder constrained in the circumferential direction and connected to the inner cylinder, and a decorative cylinder fitted to the outer side of the outer plate and the outer peripheral surface of the holder. Two symmetrical plate-like blades parallel to the inner cylinder keyhole A surface inclined at 30 ° is attached as an engagement / disengagement surface so as to be openable / closable, and the pair of engagement / disengagement surfaces are biased in a direction in which they are joined to each other. A keyhole shutter for a cylinder lock, wherein a conical recess is formed.

Images