| 摘要 |
599,194. Seats. DEHN, F. B. (Automatic Products Co.). Jan. 15, 1945, No. 1186. [Class 52(ii)] A pedestal type support for a seat has a fixed bearing mounted in the top of the pedestal, a guide box adapted to rotate in the bearing, and a seat-carrying slide assembly mounted on rollers on the guide box, the guide box being automatically locked against rotation except when the seat is fully retracted, and the seat-carrying slide automatically locking in position when fully extended. A spindle 17, rotatably held in the fixed bearing 11 by a set screw 19 engaging in an annular groove 18, has fixed to it the guide box 20 which comprises a top plate 21, a lower plate 22 and parallel side plates 23 spaced inwardly from the edges of the guide box to form tracks for rollers 43 carried on stud shaft 42 on side arms 39 which depend from a plate 38 and have secured to them spiders 40 which carry the seat S. The plate 38 is about half the length of the guide box and limits the sliding movement of the seat by abutting against upturned portions 45 and 46 of the top plate 21. A locking lever 29 carried on a pivot pin 31 has at one end a dog 34 guided by a bracket 36 through a slot 35 in the plate 22 and fitting in a notch 13 in a cap 12 on the bearing 11, thus normally holding the guide box against rotation, and at the other end a cam surface 32 which, whenever the seat is in the fully retracted position, is pressed down by the plate 38 against the action of a spring 33 and lifts the dog 34 to permit rotation of the guide box. On rotation, a lug 28 on the lower plate 22 moves a projecting end of a coil spring 27, the other end being held by a projecting pin 14 on the cap 12, the rotation being arrested after 90 degrees by abutments (not shown). In the fully extended position a spring 49 urges a finger 48 to overlap the upturned portion 45 and prevents withdrawal of the seat until a lever 47, loosely connected to the plate 38 by nuts 52, is lifted. |
