Auxiliary lock with an adjustable backset

• US 20040004360A1
• Filed: 07/08/2002
• Published: 01/08/2004
• Est. Priority Date: 07/08/2002
• Status: Active Grant

• Current Assignee: Taiwan FU Hsing Industrial Company Limited
• Original Assignee: Taiwan FU Hsing Industrial Company Limited
• Inventors: Wang, Juo-Chiao, Huang, Lan-Shi
• Granted Patent: US 6,764,112 B2
• Time in Patent Office: Days
• US Class Current: 292/337
• CPC Class Codes: E05B 63/0017 Locks with sliding bolt without provision for latching
• CPC Class Codes: E05B 63/06 with lengthwise-adjustable bolts ; with adjustable backset, i.e. distance from door edge
• CPC Class Codes: Y10T 292/06 Adjustable backset
• CPC Class Codes: Y10T 292/62 Bolt casings

Abstract

An auxiliary lock comprises a housing having a faceplate attached thereto. A casing includes a first end received in the housing and having two positioning slots for selectively engaging with a guide member of the housing. A deadbolt is received in the housing and slidable between a retracted position and an extended position. A connecting member is mounted to an end of the deadbolt. An end of a pull rod is mounted in the deadbolt and has two guide grooves each having a longitudinal section and two retaining sections transverse to the longitudinal section and communicated with the longitudinal section. When the connecting member is in the retaining sections, the deadbolt is not movable along the longitudinal direction of the housing. When the connecting member is in the longitudinal section, the deadbolt is movable along the longitudinal direction of the housing relative to the pull rod.

Claims

1. An auxiliary lock comprising:

a housing including a circular hole therein, a faceplate being attached to an end of the housing and including an opening, the housing further including a guide member;

a casing including a first end and a second end, the first end of the casing being received in the housing and including a first positioning slot and a second positioning slot, the second end of the casing including aligned pivot holes, the guide member being selectively engaged in one of the first positioning slot and the second positioning slot, wherein the housing is movable along a longitudinal direction of the housing when the guide member is disengaged from the first and second positioning slots of the casing, and wherein the housing is not movable along the longitudinal direction of the housing when the guide member is engaged in one of the first positioning slot and the second positioning slot;

a deadbolt assembly including a deadbolt, a connecting member, and a pull rod, the deadbolt being received in the housing and slidable between a retracted position in the housing and an extended position in which an end of the deadbolt is beyond the housing, the connecting member being mounted to another end of the deadbolt, the pull rod including a first end mounted in the deadbolt and a second end beyond the deadbolt, the first end of the pull rod including two guide grooves each having a longitudinal section and two retaining sections transverse to the longitudinal section and communicated with the longitudinal section, wherein when the connecting member is in the retaining sections, the deadbolt is not movable along the longitudinal direction of the housing, and wherein when the connecting member is in the longitudinal section, the deadbolt is movable along the longitudinal direction of the housing relative to the pull rod, the deadbolt and the opening of the faceplate being so configured that the deadbolt turns together with the housing when the deadbolt is in its extended position and that the deadbolt is not turnable when the deadbolt is in its retracted position; and

a drive wheel including a cylindrical portion that is rotatably held in the pivot holes of the casing, a drive arm extending from the cylindrical portion and having an end connected to the second end of the pull rod such that rotation of the drive wheel causes movement of the pull rod for moving the deadbolt along the longitudinal direction of the housing.

2. The auxiliary lock as claimed in claim 1, wherein the opening of the faceplate is not circular, the deadbolt including an enlarged portion to thereby forming a stop edge for preventing disengagement of the deadbolt from the housing.

3. The auxiliary lock as claimed in claim 1, wherein an inner periphery defining each said pivot hole of the casing includes two angularly spaced restraining edges for restraining pivotal movement of the drive wheel.

4. The auxiliary lock as claimed in claim 1, wherein the deadbolt including a compartment, further including a rigid reinforcing member mounted in the compartment.

5. The auxiliary lock as claimed in claim 4, wherein the rigid reinforcing member is partially received in the pull rod.

6. The auxiliary lock as claimed in claim 4, further comprising an elastic element having a firs tend attached to an end wall defining the compartment and a second end attached to an end face of the pull rod.

7. The auxiliary lock as claimed in claim 1, wherein one of the guide grooves is U-shaped and the other guide groove is inverted U-shaped.

8. The auxiliary lock as claimed in claim 1, wherein the guide grooves are symmetrically defined in two opposite sides of the pull rod, and wherein the deadbolt includes aligned transverse holes in which two ends of the connecting member are received.

9. The auxiliary lock as claimed in claim 1, wherein the casing including a circular hole portion allowing rotation of the deadbolt, the casing further including a non-circular hole portion preventing rotation of the deadbolt yet allowing longitudinal movement of the deadbolt.

10. The auxiliary lock as claimed in claim 1, wherein the second end of the pull rod includes a hole in which the end of the drive arm is engaged.

11. The auxiliary lock as claimed in claim 1, wherein the drive wheel includes a stop, the casing further including an elastic element mounted therein, the elastic element having a first end attached to the stop of the drive wheel and a second end fixed to the casing.

12. The auxiliary lock as claimed in claim 1, wherein the casing is comprised of two casing halves.