Patent GB-123568-A (GB)
Title: Improvements in or relating to Lifting Trucks.
Inventor: BARRETT ARTHUR MERRITT
IPC: B62B3/06
Filed: 1918-02-22
Abstract: 123,568. Barrett, A. M. Feb. 22, 1918. Hand-trucks with lifting-frames or platforms adapted to be run under the load. The horizontal pivot between the handle and the king-bolt of the fore-wheels is adapted to be moved to permit engagement of the handle with the lifting-frame for raising this frame. Special means for locking the frame in raised position, special link connexions between the lifting and under frames, and special connexions for the dash-pot are provided. The lifting frame 41 rides at its front end upon inclines fixed to the underframe 13. At the rear it is connected by a member comprising links or arms 48 pivoted upon the rear axle 15 and a cylindrical member 49 secured to the arms 48 and bearing against the transverse member 42 of the lifting frame, thus providing an extended support for the frame. The bearing surface of the member 42 may be rounded. The arms 48 may have a flat 51 to serve as a stop and support for the lifting frame in the lowered position. Bolts or pins 54, 55 on the member 49 pass through the side members 41 of the lifting-frame and the additional links 53. The under frame 13 is supported upon the front wheels by the member 20 centrally disposed in the front transverse member of this frame and socketed in the block 22 to which the axle of the fore wheels and the king bolt 25 are fixed. The upper part 18 of the member 20 is cup-shaped to accommodate the head 27 of the king bolt 25. The truck handle 34 is pivoted at 37 to a pair of links 38 pivoted at 39 to the head 27 between a pair of brackets 28 which have a curved surface 31 and end fingers 29, 30<a> so as to form a support and limiting means for the pivot 37 The truck handle 34 has a cranked and hooked end 35 adapted to engage a pin 58 on a member 57 fixed to the lifting frame 41. The pivot 37 of the handle assumes the forward position shown in broken lines when the truck is being propelled, and the handle can be also thrown up into a vertical out of service position as shown with the pivot in this position. To raise the lifting-frame 41, the pivot 37 is moved to the rear position, the hook 35 is engaged with the pin 58, Fig. 3, and the handle is pulled downwardly, Fig. 4. The means for locking the frame in the raised position comprises a latch 61 pivoted to the cross-head member 20 of the underframe 13 and adapted to engage the tooth 63 on the elevating frame as the frame reaches the raised position. After the latch has thus engaged, a member 64 pivoted at 65 upon the lifting frame comes into position over the latch 61, as shown in Fig. 4, and locks it in the engaged position. The member 64 can be swung out of engagement with the latch to permit lowering the frame, by a finger 69 pivoted at 62 and actuated by a foot-lever 71. The descent of the lifting frame is checked by a dash-pot 72 which has rounded bearing-members 74, 81, seating against the transverse members 77, 82 of the under and lifting frames. The member 74 is recessed at 76<a>, Fig. 7, to receive a bolt which passes through the frame member 77 and a spring 78 whereby the bearing is yieldingly held in position and wear is taken up. A similar spring connexion is provided between a lug 83 on the member 81 and the lifting frame.