| 摘要 |
724,329. Seats. DUCROT, A. March 30, 1953 [April 25, 1952; July 9, 1952; Dec. 31, 1952], No. 8742/53. Class 52 (2). A chair is arranged to act as a fixed upright chair, one in which the back rest is raised and adjusted angularly in a backwards direction and as one which serves as a rocking chair. Fig. 1 comprises a seat frame 7 and back rest frame 10 linked to an underframe 1 through, at each side, a side plate 4 pivoted at 13 to the underframe 1. As shown, each side plate is connected to the seat frame 7 by a link 5 and by an arm 11 of a bell-crank lever and connected to the back rest frame 10 by a link 8 and the other arm 12 of the bell-crank lever. Cross-members 2, 3 of the underframe 1 serve also as stops as do also projections 28, 29 and pin 30. In operation, the back rest 10 is raised causing it to incline somewhat to the rear, move the seat 7 forwardly through the bell. crank lever 11, 12 carrying with the seat the link 5. The chair is now in a position to be rocked by the occupant under the restraint of springs 14. Fig. 11 shows a modification in which a leg rest 45 is provided adapted to fold under the seat in out-of-use position or extended forwardly at any desired angle in which position it may be locked by pegs 47 engaging one of a series of holes 48 in a seat sector. The side plates 4 are provided at the front with bell-crank levers, one arm 5 of which linked by link 36 to one arm of the rear bell-crank levers 11, 12 which an arm 38 of the front bell-crank is connected with a corresponding arm on the other side of the seat by a crossbar 39 which consequently serves as a handle. The front part of the side plate 4 has an extension 40 to enable a system of springs 41 ... 44 to be mounted. As shown, the chair is in inclined position and may be rocked. To bring it to fixed upright position the bar 39 is raised, causing the rear bell-crank levers 11, 12, through links 36 to lower the back rest and incline it forwardly to more upright position. This action also brings a pin 51 on arm 5 beneath a projection 52 on the underframe to lock the seat and back. Fig. 17 shows a construction somewhat similar to that shown in Fig. 11 except that the underframe 32 is provided with arm rests 55 on which is mounted a locking handle 60 operating a bolt 58 co-operating with a rack 57 slidable on the underframe and linked by a link 65 to the side plate 4. |
