JP2003129706A - Key-hole shutter for cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the penetration of rain, snow and dust into a key hole for a cylinder lock, and to simultaneously prevent an unlocking by a picking. SOLUTION: A holder 15 for a shallow cup lock capable of being rotated together with an internal cylinder is installed on the external surface of an internal cylinder 8 for the cylinder lock 1, directing an opening to the outside, and two blades 21 and 21 are mounted into the external recessed section 17 of the holder in an openable and closeable manner while conical recessed sections 24 are formed to the surfaces of the blades.

Description

Description: BACKGROUND OF THE INVENTION 1. Field 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. 2. Description of the Related Art A shutter for opening and closing a keyhole is not generally provided in a door lock at a doorway of a building. [0003] It is difficult to incorporate a keyhole shutter into a small cylinder lock, although the doorway is under the eaves of the entrance and it can usually prevent rain or snow from entering. That is a big reason. [0004] On the other hand, with regard to door locks at entrances and exits of buildings, crimes called picking have frequently occurred recently, causing enormous damage. [0005] Regarding the cylinder lock at the door opening, even if the rain does not directly enter the keyhole,
It is often experienced that dust enters the cylinder lock after a long period of use and the movement of the tumbler becomes slow. [0006] In addition, as the damage of picking has increased, there is a demand for the development of a cylinder lock that can effectively prevent the picking. SUMMARY OF THE INVENTION It is an object of the present invention to provide a shutter in which dust does not enter the cylinder lock, guarantee stable operation of the cylinder lock for a long period of time, and effectively resist picking. . [0008] In order to achieve the above object, the present invention is directed to a structure in which a cylinder lock having a built-in cylinder lock is rotatable integrally with an inner cylinder of the cylinder lock. A shallow cup-shaped holder is provided with the opening on the outside. In this holder, two symmetrical thick plate-like blades are opened and closed with the surface inclined parallel to the keyhole of the inner cylinder or inclined by 30 ° as a disengagement surface. At the same time, the pair of engaging and disengaging surfaces are urged in a direction in which the pair of engaging and disengaging surfaces are joined to each other.On the other hand, in the front of the two blades, a concave portion that is normally conical when the blades are closed is formed. Features. Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. As shown in FIG.
Is usually mounted on the lock box 3 via the cylinder tube 2. The cylinder tube 2 is a cup-shaped member having, for example, a pair of connecting pieces 4 protruding outside the opening edge, and each connecting piece 4 is formed with a mounting hole 5 penetrating it horizontally. ing. Then, the cylinder lock 1 is stored in a state where the inner cylinder 8 is seen through the inner cylinder insertion hole 7 opened in the outer plate (bottom plate of the cup) 6 of the cylinder cylinder, and the retaining ring 9 prevents the cylinder lock 1 from coming off. The cylinder cylinder 2 is made to penetrate the side surface of the lock box 3 and the door 11 and protrude outside the room. An opening edge of the cylinder cylinder 2 remaining in the lock box 3 is attached to the mounting rod 1 horizontally passing through the mounting hole 5 of the connecting piece.
It is carried on the lock box 3 via 2 and 12. The mounting rod 12 is mounted so as to penetrate the lock box 3, and both ends thereof are carried by the lock box. In the figures, reference numeral 13 denotes a decorative ring having a perforated trapezoidal outer shape.
Usually, the opening base is mounted on the outer surface of the door 11 by the elastic force of a ring spring 14 as a compression coil spring wound around the outer periphery of the cylinder cylinder. Outside the outer plate 6 of the cylinder tube 2 (on the left side), a holder 15 is attached so as to be rotatable integrally with the inner tube 8. The holder 15 is a shallow cup-shaped member. A circular inner concave portion 16 is formed on the back surface, and the tip of the inner cylinder is inserted into the holder. The cylinder 8 is connected to the cylinder 8 while being restricted in the circumferential direction. As shown in FIG. 2, an outer concave portion 17 for accommodating blades 21 and 22 of a shutter 20, which will be described later, is formed on the front surface of the holder. Furthermore, the inner and outer recesses 16,
In the center of the holder 15, an opening 18 large enough to allow the key stem 40 to be inserted.
Is formed. On the other hand, the shutter 20 is composed of two thick plate-like blades 21 (see FIGS. 2, 3 and 4). Each of the blades 21 is a blade having a shape similar to that of a lens shutter having an arcuate outer surface 22 and a linear engagement / disengagement surface 23. A shaped recess 24 is formed to guide the insertion of the key stem (see FIG. 4). The orientation of the engaging and disengaging surface 23 in a normal state in which the shutter is closed can be easily understood by comparing FIG. 2 and FIG. On the other hand, it is inclined at an angle of about 15 degrees counterclockwise. Further, a pin 25 is projected from the rear side of the base end of each blade 21. The pin 25 is fitted into a hole formed at one end of the holder. It is supported so that it can rotate around. The base of each blade 21 is formed with an arc-shaped concave portion such as a rotary disk tumbler. One end of a leaf spring 26 is mounted in this concave portion, and the other end is formed in the concave portion 17 of the holder. Is pressed against the inner surface of the By the elasticity of the leaf spring 26, each blade 21
Is a counterclockwise direction in the drawing, that is, a pair of
Are biased in a direction in which they are in elastic contact with each other, so that the engaging and disengaging surfaces 23 are normally closed (see FIG. 2). On the other hand, a thin cup-shaped decoration tube 32 is fitted outside the outer peripheral surfaces of the outer plate 6 and the holder 15 via a spacer ring 31, and the decoration tube 32 prevents the blades from falling off. An opening 33 having a size large enough to allow the key stem 40 to pass therethrough is formed in the center of the bottom surface of the decoration tube 32. Further, the spacer ring 31 and the base 32 of the decorative cylinder are fixed by caulking indicated by reference numeral 34 to the cylinder cylinder 2.
Is fixed to the outer peripheral surface. In the shutter constructed as described above according to an embodiment of the present invention, the shutter 20 has a key stem 4
In a normal state where 0 is not inserted, as shown in FIG. 2, the engaging and disengaging surfaces 23 of the respective blades are closed in a state of being in elastic contact with each other,
It prevents rain, snow and dust from entering from the outside. Here, as shown in FIG.
When the direction of 0 is pushed in the direction shown by the arrow in accordance with the key hole 41 of the inner cylinder 8, the tip of the stem comes into contact with the conical recess 24 as shown in FIGS. A horizontal component force is generated by the generated wedge action. Due to this horizontal component, each blade 21 is rotated clockwise around the pin 25 against the elasticity of the leaf spring 26, the shutter is opened, and the stem is in the keyhole 41. Inserted in. When the stem 40 is inserted into the shutter, the engaging / disengaging surface 23 of the blade is substantially parallel to the direction of the stem 40 or the keyhole 41, so that the stem can be easily inserted. Here, when the stem of the key is rotated, the inner cylinder and the shutter are both rotated, and the tail piece 19 is also rotated to perform the locking / unlocking operation. On the other hand, when the cylinder lock with shutter is to be unlocked illegally by so-called picking, a thin tool for operating the tumbler and a tool for urging the inner cylinder in a certain direction are inserted from a small keyhole. In this state, a tool or operation for keeping the blades open is required, so that picking becomes very difficult. On the other hand, considering the relationship between the engagement / disengagement surface 23 of the blade 21 and the direction of the keyhole 41, the engagement / disengagement surface 23 is parallel to the keyhole 41 in FIG. On the other hand, it is inclined 30 degrees clockwise, and in FIG. 13, the engagement / disengagement surface is formed inclined 15 degrees clockwise with respect to the keyhole. In the case shown in FIG. 9, there is an advantage that the stem is easy to insert because the inclined surface and the keyhole are parallel, but when the blades 21 are opened as shown in FIG. Since the opening is inclined clockwise with respect to the keyhole, it is necessary to increase the rotation angle of the blade. On the other hand, in the case shown in FIG. 11, since the engaging and disengaging surface is greatly inclined with respect to the keyhole, the insertion of the stem is not performed as shown in FIG.
12, and when the blade is opened as shown in FIG. 12, the opening of the blade is formed to be inclined counterclockwise with respect to the keyhole. It is necessary to increase the moving angle. In the case shown in FIG.
Is about 15 degrees counterclockwise with respect to the keyhole 41, the insertion of the stem is slightly more difficult than in the case of FIG. 9, but when the blade is opened as shown in FIG. Since the opening of the blade is parallel to the keyhole, the rotation angle of the blade can be minimized. Therefore, the case shown in FIG. 13 is optimal for practical use, but according to experiments, the case shown in FIG.
It has been found that there is no problem in practical use as well as those inclined at 30 degrees as shown in FIG. As is apparent from the above description, according to the present invention, an openable and closable shutter composed of two blades is mounted on the front surface of the inner cylinder of the cylinder lock. In addition, it is possible to prevent rain, snow and dust from entering the inside, and it is also possible to make unauthorized unlocking by picking that has frequently occurred recently difficult.

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 a shutter with a decoration tube removed,
This shows a state where the shutter is closed. FIG. 3 is a front view of the shutter similar to FIG. 2, showing a state where the shutter is opened. FIG. 4 is an external perspective view of a blade of a shutter. FIG. 5 is a front view of the cylinder lock, showing a state in which a shutter is closed. FIG. 6 is a front view of the cylinder lock similar to FIG. 5, showing a state where a shutter is opened. FIG. 7 is an explanatory view showing a state in which a key stem is inserted into a shutter. FIG. 8 is the same explanatory diagram as FIG. 7; FIG. 9 is a diagrammatic explanatory view showing the relationship between the direction of engagement and disengagement of a blade of a shutter and the direction of a keyhole according to another embodiment of the present invention;
This shows a state where the shutter is closed. FIG. 10 is a diagrammatic explanatory view similar to FIG. 9, showing a state in which a shutter is opened. FIG. 11 is a schematic explanatory view showing the relationship between the direction of engagement and disengagement of blades of a shutter and the direction of a keyhole according to still another embodiment of the present invention, showing a state in which the shutter is closed. FIG. 12 is a diagram similar to FIG. 11, showing a state in which a shutter is opened. FIG. 13 is a schematic explanatory view showing the relationship between the engagement and disengagement surfaces of the blades of the shutter and the direction of the keyhole according to another embodiment of the present invention, showing a state in which the shutter is closed. FIG. 14 is a diagram similar to FIG. 13 and shows a state in which a shutter is opened. [Description of Signs] 1 Cylinder lock 2 Cylinder cylinder 3 Lock box 6 Outer plate 8 Inner cylinder 15 Holder 16 Inner recess 17 Outer recess 20 Shutter 21 Blade 23 Engagement / removal surface 24 Recess 25 Pin 26 Leaf spring 40 Stem 41 Keyhole

Claims (1)

Claims 1. A shallow cup-shaped holder rotatable integrally with an inner cylinder of a cylinder lock is provided outside the outer plate of a cylinder cylinder having a cylinder lock therein, the opening being outside. In this holder, two symmetrically thick plate-like blades are attached so as to be openable and closable with a surface inclined parallel to the keyhole of the inner cylinder or at an angle of 30 ° as an engaging and disengaging surface. A keyhole shutter for a cylinder lock, wherein a concave portion which is normally conical with the blades closed is formed in the front of the two blades.