JPH0139341Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a shutter that closes the entrance of a keyhole of a cylinder lock.

In the embodiment shown in FIGS. 1 to 5, 1 is a cylindrical cylinder case, into which a plug 2 is rotatably fitted and protrusions 3 at the rear end are inserted into small holes in a lock plate 4, and the protrusions are inserted into the small holes of the lock plate 4. Tighten to connect the lock plate and plug together. Reference numeral 5 denotes a flat keyhole drilled in the axis of the plug, and has a protrusion 6 extending the entire length in the center of the keyhole.When a key (not shown) is inserted, the protrusion 6 is inserted into a groove on the side and the key is inserted. invite. Numeral 7 is a tumbler piece, which is inserted one by one into several slits 8 cut in the upper and lower walls of the plug 2, and grooves 9 and 10 for the tumbler pieces are bored in the upper and lower inner walls of the cylinder case 1. Reference numeral 11 denotes a coiled spring inserted along the side edge of the slot 8. The upper end is pressed with a fixing pin 12 to caulk the edge of the slot, and the lower end is placed against the protrusion of the tumbler piece to push down the tumbler piece 7. Insert the lower edge of the tumbler piece into the lower groove 10 and plug 2.
prevent rotation. Reference numeral 13 denotes a through hole bored in the center of the tumbler piece 7, the vertical length of which varies depending on the tooth profile edge of the key. The above structure is almost the same as a known tumbler type cylinder lock, and when a key is inserted, each tumbler piece 7 is pushed up by the tooth profile edge of the key passing through the through hole 13, and its upper edge is inserted into the upper falling groove. It is known that after the plug is inserted into the lock plate 9, it descends due to the elasticity of the coiled spring 11 and aligns with the peripheral surface of the plug 2, and when the key is turned, the plug turns the lock plate 4 to lock or unlock it.

One embodiment of the present invention is such a cylinder lock in which the entrance of the key hole 5 is slightly expanded vertically and laterally as shown in FIGS. Receiving edges 15, 15 that are recessed in the shape of
7 and insert the coiled push spring 18.
Reference numeral 20 denotes a cover piece that closes the key hole 5. The cover piece 20 is placed in the entrance of the key hole 5, and both ends are inserted into the vertically expanding parts 14, 14. A short and small base piece 21 is protruded at a right angle from the rear end of the cover piece 20. The base piece and the lid piece have an L-shaped cross section, the front and back width of the base piece is made to fit in the lateral flared part 16, and the base piece is pushed onto the protrusion 22 provided on the back side of the base piece. Fit the tip of the spring 18. A cover 24 is fixed to the front surface of the plug 2, and a through hole 25 corresponding to the key hole 5 is cut out to cover the cover piece 20 and the push spring 18.

One embodiment of the present invention has the above-mentioned configuration. Normally, the cover piece 20 is brought into close contact with the inner surface of the cover 24 by the elasticity of the pressing spring 18 to close the through hole 25, and the tip 23 is pressed against the side surface of the key hole 5. Since the lid piece 20 is in close contact with the inner surface of the cover 24 and its tip 23 is slightly thick, dirt and water are reliably prevented from entering the key hole. As shown in FIG. 5, when the key K is inserted into the through hole 25 of the cover and the cover piece 20 is pressed, the tip 23 is inserted into the arc-shaped receiving edge 1.
5 and 15, the lid piece rotates around the corner end C as a fulcrum and moves to the flared portion 16, opening the key hole 5 in an inclined position as shown by the chain line 20'. Then, insert the key K all the way into the key hole 5, and use the key to plug the plug 2.
Turn to unlock.

When the key is removed after unlocking, the cover piece 20 is pushed by the spring 18 and returns to the entrance of the key hole 5, and at this time, the cover piece rotates about the corner end C as a fulcrum while being guided by the receiving edges 15, 15. , take a horizontal position as shown in FIG. 4 and close the key hole 5. This cover piece 20 is a push spring 18
Due to the elasticity of the cover 24, it comes into close contact with the inner surface of the cover 24,
3 is pressed against the side surface of the key hole 5.

In this embodiment, since the lid piece 20 is made to have an L-shaped cross section, this lid piece rotates about the corner end C as a fulcrum. As a result, even if a relatively weak push spring 18 is used, the cover piece 20 returns while rotating smoothly, so that the resistance when inserting the key K can be reduced. Figure 6 shows the deformation of the lid piece.
A base piece 26 wound in a ring shape is provided at the rear end of the cover piece 20, and the diameter of the base piece is made approximately equal to the front and rear width of the lateral widening part 16, and this cover piece is placed at the entrance of the key hole 5. It is stored and covered with the cover 24, and assembled in the same manner as the first embodiment to have the same effect.

The above describes one embodiment of the present invention and modifications of the lid piece, but the present invention is not limited to these, and the design can be changed within the gist of the invention.

Conventional cylinder lock shutters close the entrance of the key hole with a sliding or rotating cover piece.Sliding type shutters take up less space but do not ensure that the key hole is closed; Although the keyhole is reliably closed, it has the disadvantage that it requires a large amount of space because the lid piece must be rotated.

In the present invention, the entrance of the key hole 5 of the cylinder lock is widened vertically and laterally, and a receiving edge that is concave in the shape of an arc when viewed from the front side is provided in the vertically widened part, and both ends of the cover piece that closes the key hole are widened. The plug is inserted into the vertically flared part, the push spring of the lid piece is housed in the sideward flared part, a cover is placed over the plug, and a base piece is provided at the rear end of the lid piece to fit into the sideward flared part. The above-mentioned push spring brings the lid piece into close contact with the inner surface of the cover, and the tip of the lid piece is brought into close contact with the side surface of the cover.With these configurations, a sliding type and a rotating type are combined, so the keyhole can be reliably opened in a small space. It is extremely effective as a cylinder lock shutter. In addition, since the cover piece having an L-shaped cross section rotates smoothly using its corner end as a fulcrum, it has the advantage of weakening the push spring and reducing the resistance to inserting the key.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view of the embodiment, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a front view of the embodiment, and FIG. The drawings are a sectional view taken along line BB in FIG. 3, FIG. 5 is an enlarged sectional view when the lid piece starts to open, and FIG. 6 is a side view showing the deformation of the lid piece. In addition, 2 is a plug, 5 is a keyhole, 14 is a vertically flared part, 15 is a receiving edge, 16 is a lateral flared part, 18 is a push spring, 20 is a lid piece, and 21 and 26 are its parts. The base piece, 23 is a tip, and 24 is a cover.

Claims (1)

[Scope of utility model registration request] The entrance of the key hole drilled in the plug of the cylinder lock is expanded vertically and laterally, and a receiving edge that is concave in the shape of an arc when viewed from the front side is provided in the expanded vertical portion, and both ends of the lid piece that closes the entrance of the key hole are provided. The plug is inserted into the vertically flared part, the press spring of the cover piece is housed in the sideward flared part, a cover is placed on the front of the plug, and a short and small base piece is protruded at right angles from the rear end of the cover piece. , the front and back widths of the base piece are sized to fit in the lateral expansion part, and a protrusion is provided on the back surface of this base piece into which the tip of a pressure spring is fitted, and this pressure spring brings the lid piece into close contact with the inner surface of the cover. A cylinder lock shutter characterized by having its tip pressed against the side of the keyhole.