The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1991
Filed:
Jun. 27, 1991
Cheng-Hsiung Chen, Taichung City, TW;
Other;
Abstract
A roller assembly includes an elongated casing with a shaft longitudinally provided within it. A U-shaped bracket with two opposed sides and a bottom connecting the two sides is fixed in the elongated casing. A threaded rod is sleeved on the shaft in such a way that it can rotate along with the shaft. A guiding block having a first face, a second face and an internally threaded through-hole is sleeved on the threaded rod. Each of the face have a guiding wheel. The block is sized and designed so as to sit flush on the U-shaped bracket and prevent the bracket from rotating with the threaded rod, but allowing instead the block to move axially along on the threaded rod. One end of a first string connects to one end of the threaded rod and winds on the same to a position adjacent to the first face whereat the first string is held straight between the guiding wheel on the first face and the threaded rod. A second string is also held straight between the guiding wheel on the second face of the block and the threaded rod in the same manner.