| 摘要 |
<p>1,190,366. Belt or chain tensioning devices. RENOLD Ltd. 11 May, 1967 [17 May, 1966], No. 21966/66. Heading F2Q. A belt or chain tensioning device comprises arms 13, 14 pivoted together on a hollow pin 15 and urged apart by a spring-pressed wedge member 23, the arm 13 carrying a slipper head 16 adapted to bear against the belt or chain, and the arm 14 bearing against a fixed structure. The wedge member 23 is slidably mounted on a spindle 21 attached to a bracket 22 which is mounted on pin 15. A rack 18 is secured to arm 13 and has serrations 19 which are engaged by serrations 27 formed on the wedge member 23. The surface of the member 23 contacting the arm 14 is curved. The device is bolted in position through hollow pin 15. In a modification, an arm 13a is formed with lugs 29, 31 having elongated holes through which a spindle 33 projects, and an arm 14a has a curved portion 34 so shaped that the wedging action is increased as the wedge member 23a moves closer to the head of spindle 33. Several modifications having means for cocking and locking the device in an energized state, i.e. with the helical spring fully compressed, are described. A pivoted tensioning strip may be utilized.</p> |
