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:
Apr. 03, 1990
Filed:
Feb. 19, 1988
Makoto Orii, Nagano, JP;
Katsuhiko Hayashi, Nagano, JP;
Kabushiki Kaisha Sankyo Seiki Seisakusho, Nagano, JP;
Abstract
A door check is disclosed which comprises a first arm pivotally attached at one end thereof to a door which is able to be opened and closed as desired; a second arm pivotally attached at one end thereof to the first arm, the other end of the second arm being pivotally attached to a door frame for supporting the door in such a manner that the door is able to be opened and closed as desired; a driving force storing spring retained by either the first or second arm and biased in response to the pivotal motion of the door in the opening direction so as to store force for driving the door in the closing direction; a gear train for transmitting the rotation of the door when opened to said driving force storing spring and also transmitting the driving force stored in the driving force storing spring to the door; a brake rotated by means of the force released from the driving force storing spring to apply a brake force to the force; and a speed increasing gear train coupled at its starting end to said driving force storing spring to transmit the force released from the driving force storing spring to the brake after increasing the speed thereof. The speed increasing gear train has a worm in the final stage thereof.