Balanced lifting beam

• US 3,976,202 A
• Filed: 05/07/1975
• Issued: 08/24/1976
• Est. Priority Date: 10/22/1974
• Status: Expired due to Term

• Current Assignee: Rene Bauvin
• Original Assignee: Rene Bauvin
• Inventors: Bauvin, Rene
• Primary Examiner(s): Spar, Robert J.
• Assistant Examiner(s): Oresky, Lawrence J.
• Application Number:
  US05/575,373
• Time in Patent Office: 475 Days
• Field of Search: 212/10, 212/11, 212/13, 212/14, 212/18, 212/19, 212/20, 212/21, 212/23, 212/24, 212/25, 212/27, 212/97, 212/98, 254/175.5, 254/183
• US Class Current: 212/322
• CPC Class Codes: B66C 11/16 Rope, cable, or chain drives for trolleys; Combinations of such drives with hoisting gear
• CPC Class Codes: B66C 11/18 comprising endless ropes or cables

Abstract

A single beam traveling crane includes a trolley movable over the beam and a hoist block arrangement located on opposite sides of the trolley frame. The winch which controls the hoist block cable is mounted at one end of the beam rather than on the trolley itself which in combination with the split or divided arrangement of the hoist block on the trolley eliminates any torsional effort on the beam which permits a lighter beam structure.

Claims

1. In an overhead crane installation including spaced apart parallel rails mounted on a supporting structure, a single traveling beam spanning the space between said rails, said beam including spaced apart parallel rails, a carriage at each end of said beam, wheels mounted on said carriage and riding on said installation rails, a trolley mounted on said beam, said trolley including a frame, a pair of wheels mounted on each side of said frame and movable over the rails of said beam, a first rotatable drum mounted at one end of said traveling beam, a first cable having one of its ends secured to said first drum and the other end secured to said trolley, a pulley mounted at the opposite end of said beam, a second cable having one of its ends secured to said first drum, said cable returning around said pulley at the opposite end of said beam and having the other of its ends secured to the opposite end of said trolley, a hoist block mounted on said trolley frame, said hoist block comprising a pair of pulleys mounted on each side of said trolley frame, a transverse hoist beam including a pulley mounted at each end thereof and a hook suspended therefrom, a second drum mounted on one of said carriages at one end of said traveling beam, a pair of return pulleys mounted on the other of said carriages at the opposite end of said traveling beam, a third cable having one end fixed to said drum and passing over one pair of said hoist pulleys, then passing over one of said transverse hoist beam pulleys around each of said return pulleys and over the other pair of hoist pulleys and the other of said transverse hoist beam pulleys and connected at its opposite end to a fixed point on said carriage on which the second drum is mounted, and power means for rotating one of said drums to raise and lower said hook as required.

2. An overhead crane installation according to claim 1 wherein a pair of drums are mounted on one of said carriages and said third cable has one of its ends connected to one drum and the other of its ends connected to the other drum.