| 摘要 |
1,086,411. Hinges. T. V. MANNERHEIMO. Jan. 20, 1965 [Jan. 21, 1964], No. 2432/65. Heading E2F. A hinge, for retaining the seat and back or foot rest of a chair &c. in one of a plurality of relative angular positions, comprises a seat arm 15 and a back rest arm 16 each pivotally connected to and between two parallel connector links 17, by parallel pivot pins 18. In the form shown, back rest arm 16 is provided with a tooth 22 for engagement with a plurality of teeth 20 on seat arm 15. A spiral spring surrounds the pin 18 of arm 16 and acts between arm 16 and link 17 to urge the arm 16 in a counter-clockwise direction to engage tooth 22 in teeth 20, and for a shoulder 21 on arm 16 to abut a face 19 on link 17 to provide a stop for arm 16. The relative positions of the two arms is altered by firstly rotating arm 16 in a clockwise direction about link 17 to free arm 16 from arm 15. The arm 16 and link 17 are then rotated in unison to the desired position, and the arm is then rotated counter-clockwise to re-engage the two arms. Tooth 22 may be replaced by a double tooth (Fig; 7, - not shown) for increased strength. In a second embodiment (Fig. 8, not shown), the two arms engage indirectly through a pawl (30) slidably mounted on links 17, the mode of operation being similar. |
