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Load balancer

  • US 5,314,291 A
  • Filed: 09/10/1992
  • Issued: 05/24/1994
  • Est. Priority Date: 09/24/1991
  • Status: Expired due to Fees
First Claim
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1. A load balancer comprising an undercarriage (1), a turntable (9) capable of turning around a vertical shaft owing to a swing bearing (8) provided on a chassis frame (4) of said undercarriage (1), a horizontal pin (10) provided on said turntable (9), a weight sensing cylinder (11) connected pivotally to an intermediate portion of said horizontal pin (10) and extending substantially upward, a balance cylinder (13) provided with a piston (41) fitted in said weight sensing cylinder (11), a balance frame (14) fixed to the upper end of said balance cylinder (13) with a piston rod (16) of a balance piston (15) of said balance cylinder (13) passed therethrough, air brake cylinders (22) fixed to said balance frame (14) and positioned at the same distance on opposite sides of said balance cylinder (13), a pin (19) connected at an intermediate portion thereof to said piston rod (16) via a shaft, connected at the portions thereof which are on both sides of and equally spaced from said piston rod-connected portion to a lower arm (18) of a rhomboidal link (17) via shafts and connected at both end portions thereof via bearings to brake rods (21) passed through said air brake cylinders (22), swing arms (12) supported upright on said turntable (9) and connected to one end portion of each of an upper and said lower arms (25, 18) of said rhomboidal link (17), a support frame (27) connected at the portions thereof which are spaced at a distance equal to that between pivot pins (23, 24), via which said swing arms (12) and said upper and lower arms (25, 18) are connected together, to the other end portions of said upper and lower arms (25, 18), and an article support member (31) fitted around a vertical pin (30) fixed to said support frame (27).

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