Closure fasteners – Adjustable backset
Reexamination Certificate
1999-11-19
2001-11-20
Estremsky, Gary (Department: 3627)
Closure fasteners
Adjustable backset
C292S337000
Reexamination Certificate
active
06318769
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a backset adjustment structure of a dead bolt assembly provided to a door for locking the door which can adjust a backset distance to 60 mm or 70 mm in a convenient manner.
2. Discussion of Related Art
In order to provide a door lock to a door, an installation hole should be formed on the door, and a distance from the door's end to the installation hole's center is formed to one of two standards: 60 mm or 70 mm. Therefore, the dead bolt assembly has a backset adjustment structure, and according to a conventional structure disclosed in Utility Model Registration No. 83799 and Patent No. 104703 granted to the present applicant, a dead bolt and a bolt head are turned by about 45° and pushed or pulled, and then 45° turned to the original position for the backset adjustment. In another way, the screwy turning has been used for backset adjustment. However, these conventional structures are complicated to cause high production costs, and handling for backset adjustment is not easy and takes time thereby decreasing the yield in mass production. In addition, it is very hard for users to adjust the backset distance, thus requiring the more simple backset adjustment structure.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a backset adjustment structure of a dead bolt assembly for door lock which performs backset adjustment simply by extending or pushing the dead bolt assembly's front and rear portions while pushing a button that was made when manufacturing the dead bolt assembly.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the present invention provides a backset adjustment structure for a dead bolt assembly having a dead bolt connected with an operating plate, a support tube connected to support plates, and an operating lever operating the dead bolt, including cover plates enclosing the support plates and each having a hole for receiving the operating lever; a catch plate installed next to the operating plate to be moved along with the cover plates, and having catch grooves in which a given sized catch boss, provided to the operating plate, is fitted; the operating plate having a front end connected with the dead bolt by a pin and able to be turned down, and a space with a slant at its middle; and a button with a protruded slant formed on one of the cover plates, and operating to turn the operating plate down.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 4593542 (1986-06-01), Rotondi
patent: 4602490 (1986-07-01), Glass
patent: 4772055 (1988-09-01), Fang
patent: 4957315 (1990-09-01), Lin
patent: 5944366 (1999-08-01), Aramburu
patent: 5957510 (1999-09-01), Kuo
Estremsky Gary
Hyundae Metal Co., Ltd.
Jacobson & Holman PLLC
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