Patent GB-1049547-A (GB)
Title: Improvements in or relating to conveyor apparatus
IPC: B65G49/04
Filed: 1965-05-31
Abstract: 1,049,547. Conveying apparatus. UDYLITE CORPORATION. May 31, 1965 [June 5, 1964], No. 23144/65. Heading B7L. Conveying apparatus for electroplating operations comprises an elevator chassis 18 vertically movable in a framework 10, 12, 14, 16, work racks 62 suspended from work carriers 60 running on a rail straight (not shown) or a rail loop comprising rail sections 54, 76 on the chassis 18, and on fixed lower rail sections 56, Fig. 3 (not shown) on the framework, or on vertically movable, or fixed, upper rail sections 94 or 152 mounted on a frame 98, and a pusher mechanism comprising reciprocable pusher bars 66 slidable in shoes 68 attached to side channels 46 of the chassis 18 and pivoted pusher dogs 72 on the bars 66 engageable with the work carriers 60 during advancing movement of the bars, sector plates 78 rotatably mounted on the chassis and carrying pivoted pusher dogs 72, and a reciprocable pusher bar section 108 or 122, Figs. 5-9 (not shown) slidably mounted in shoes 104 suspended from the beam 16 of the framework and operable by the pusher bars 66 when the chassis is raised, and retracting means connected to the pusher bar section 108 or 132 and to the chassis and operable in response to vertical movement of the chassis for moving the pusher bar section 108 or 132 to a retracted position. The chassis 18 is raised and lowered by a hydraulic cylinder, counterweights 32, sprockets 38, 40, 44, and chains 36, guided by rollers 20 engaging framework columns 14, and aligned vertically with the rail sections 56, 94 by limit switches LS1, LS2, tripped by shoes 34, 28. A fluid-actuated cylinder 84 on the chassis rotates one sector plate 78 to the advanced position, the plate 78 being linked by guided arms 90 to pusher bars 66, so that the work racks are moved around the rail loop until halted by a limit switch LS4 and the pusher bars 66 and sector plates 78 are then retracted by the cylinder 84 until halted by a limit switch LS3 while the chassis is raised or lowered. The pusher bar section 108 is engageable by the pusher bar 66 when the chassis is raised to move the dogs 72. A retraction chain 116, Fig. 4 (not shown), is connected to the member 102 and passes via pulleys 120, 124 through an aperture 126 in a cross member 128 of the chassis and is secured to block 130 engageable by the member 128 in at least a portion of the chassis descent so that the section 108 is retracted. Gear trains may be employed to effect the retraction. In another embodiment, Figs. 5-9 (not shown), retraction of the pusher bar section 132 is effected by a bracket 150 fixed to a chain 146 driving via a sprocket 144 a shaft 142 round which a chain 138 is trained, a dog 140 on the chain 138 engaging a flipper dog 134 on the section 132 when the chassis is being raised. The rail section 152 is raised by a bracket 160 carried by a chain 158 engaging a block 162 on the rail section 152, the chain being driven from the shaft 142 and raising the section 152 as the chassis is raised. The section 152 is retained in the raisedp osition by an hydraulic cylinder 168 mounted between the framework and the section 152. Lowering of the section 152 may be effected manually, remotely or automatically by a timer energizing a solenoid valve 176 in the hydraulic circuit to allow the bleeding of fluid from the cylinder.