US-12618265-B2 - Cylinder lock and door

US12618265B2US 12618265 B2US12618265 B2US 12618265B2US-12618265-B2

Abstract

A cylinder lock is disclosed that is capable of preventing a driver pin from falling over inside a pin hole even when the driver pin has been shortened. The cylinder lock comprises an outer cylinder and an inner cylinder that rotatably fits into the outer cylinder. The outer cylinder and the inner cylinder each have a hole formed therein which connects to a key hole and into which the driver pin can be inserted. The diameter of the outer cylinder side of the driver pin is greater than the diameter of the inner cylinder side of the driver pin. An orientation-maintaining region having a prescribed length in the axial direction and a fixed diameter is preferably provided at the outer cylinder-side end of the driver pin.

Inventors

Fuminori AKIYAMA
Takashi Mitsuhashi

Assignees

LIXIL CORPORATION

Dates

Publication Date: 20260505
Application Date: 20221128
Priority Date: 20211201

Claims (9)

1 . A cylinder lock, comprising: an outer cylinder; and an inner cylinder rotatably engaging with the outer cylinder, wherein a hole is formed in the outer cylinder and the inner cylinder, in which the hole communicates with a keyhole, and a driver pin and a tumbler pin can be inserted through the hole, the driver pin includes a posture maintaining region on a side of the outer cylinder, the driver pin includes a communication region on a side of the inner cylinder, a diameter of the posture maintaining region is larger than a diameter of the communication region, a sum of an axial length of the driver pin and an axial length of the tumbler pin is not more than twice the diameter of the posture maintaining region, and the diameter of the posture maintaining region is substantially equal to a hole diameter of the hole formed in the outer cylinder.
2 . The cylinder lock of claim 1 , wherein the driver pin includes: a step between the posture maintaining region and the communication region.
3 . The cylinder lock of claim 2 , wherein an axial length/diameter ratio, which is a ratio of an axial length of the posture maintaining region to the diameter of the posture maintaining region, is 0.3 or more.
4 . The cylinder lock of claim 1 , wherein a length L 2 of a portion where the outer cylinder engages with the inner cylinder is shorter than a length L 1 of a portion where the inner cylinder engages with the outer cylinder, forming a clearance corresponding to a difference between L 1 and L 2 , and a difference between the diameter of the driver pin on the side of the outer cylinder and the diameter of the driver pin on the side of the inner cylinder is a length of at least as long as the clearance.
5 . A door comprising the cylinder lock of claim 1 .
6 . The cylinder lock of claim 1 , wherein the diameter of the posture maintaining region is constant over a certain length in an axial direction from an edge of the driver pin on the side of the outer cylinder.
7 . The cylinder lock of claim 1 , wherein the posture maintaining region includes a region which varies in diameter in an axial direction and in which the driver pin has a larger diameter at an edge on the side of the outer cylinder than at another edge on the side of the inner cylinder.
8 . The cylinder lock of claim 1 , wherein the posture maintaining region has a tapered shape in which the driver pin has a largest diameter at an edge on the side of the outer cylinder and gradually decreases in diameter towards the inner cylinder.
9 . The cylinder lock of claim 1 , wherein a clearance between the communication region and an inner peripheral surface of the hole formed in the inner cylinder is larger than a clearance between the posture maintaining region and an inner peripheral surface of the hole formed in the outer cylinder.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a national stage application under 35 USC 371 of International Application No. PCT/JP2022/043707, filed Nov. 28, 2022, which claims the priority of Japanese Application No. 2021-195253, filed Dec. 1, 2021. The entire contents of each priority application are incorporated herein by reference. FIELD OF THE DISCLOSURE The present disclosure relates to cylinder locks and doors. BACKGROUND OF THE DISCLOSURE Conventionally, cylinder locks installed in residential doors and similar applications are known. A cylinder lock includes an outer cylinder, an inner cylinder rotatably engaging with the outer cylinder, a driver pin that restricts the rotation of the inner cylinder, and a tumbler pin. The unlocking key corresponding to the cylinder lock includes protrusions and indentations formed in portions contacting the tumbler pin. When the unlocking key is inserted into the keyhole of the cylinder lock, and the contact surfaces of the driver pin and the tumbler pin are aligned with the shear line being the outer peripheral surface of the inner cylinder, the inner cylinder becomes rotatable (for example, refer to Japanese Unexamined Patent Application, Publication No. H9-170363). This enables the locking and unlocking of the cylinder lock. SUMMARY OF THE DISCLOSURE Problems to be Solved by the Invention In order to downsize the cylinder lock for space-saving and cost reduction purposes, the total length of the driver pin needs to be shortened. Meanwhile, a certain clearance is provided between the driver pin and the pinhole of the outer cylinder that accommodates the driver pin. Therefore, simply shortening the total length of the driver pin may cause the driver pin to topple over inside the pinhole. One approach to avoiding this situation may be to narrow the clearance between the driver pin and the pinhole. However, with this approach, the driver pin could not be inserted into the pinhole of the inner cylinder due to misalignment between the pinhole of the outer cylinder and the pinhole of the inner cylinder. Since the inner cylinder is rotatably fixed to the outer cylinder, it is impossible to completely eliminate the misalignment between the pinhole of the outer cylinder and the pinhole of the inner cylinder. The present disclosure has been made in light of the above, and aims to provide a cylinder lock that can prevent the driver pin from toppling over inside the pinhole, even when the driver pin is shortened. Means for Solving the Problems The present disclosure relates to a cylinder lock including an outer cylinder and an inner cylinder that rotatably engages with the outer cylinder, in which holes are formed in the outer and inner cylinders, the holes communicate with the keyhole, the driver pin can be inserted into the holes, and the diameter of the driver pin on the outer cylinder side is larger than the diameter of the driver pin on the inner cylinder side. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a perspective view illustrating a configuration of a cylinder lock according to the present embodiment; FIG. 2 is an exploded perspective view illustrating the configuration of the cylinder lock according to the present embodiment: FIG. 3 is a cross-sectional perspective view illustrating the configuration of the cylinder lock according to the present embodiment: FIG. 4 is a side view of an inner cylinder according to the present embodiment: FIG. 5 is a side view of an outer cylinder according to the present embodiment: FIG. 6 is a front view of a driver pin and a tumbler pin according to the present embodiment; and FIG. 7 is a front view of a door equipped with the cylinder lock according to the present embodiment. DETAILED DESCRIPTION OF THE DISCLOSURE Cylinder Lock As illustrated in FIG. 1, a cylinder lock 10 according to the present embodiment is used in conjunction with an unlocking key 5 capable of locking and unlocking the cylinder lock 10 in a locking device 1. As illustrated in FIGS. 1 and 2, the cylinder lock 10 includes an inner cylinder 2, an outer cylinder 3, a decorative member 4, a driver pin 61, and a tumbler pin 62. The inner cylinder 2 rotatably engages with the fixed outer cylinder 3. Inner Cylinder As illustrated in FIG. 2, the inner cylinder 2 is a substantially cylindrical member that rotatably engages with the outer cylinder 3. The material for the inner cylinder 2 is not particularly limited, and may be composed of metal such as brass, for example. An outer peripheral surface 20 being the sliding surface of the inner cylinder 2 contacts an inner peripheral surface 30 of the outer cylinder 3, and engages with the outer cylinder 3. A keyhole 21, into which the unlocking key 5 can be inserted, is formed in the inner cylinder 2 along the axial direction of the inner cylinder 2. As illustrated in FIG. 2, a plurality of pinholes 22 communicating with the keyhole 21 are formed in the outer peripheral surface 20 of the inner cylinder 2. At