The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 1986
Filed:
May. 15, 1985
James J Pancook, Tonawanda, NY (US);
Columbus McKinnon Corporation, Amherst, NY (US);
Abstract
A portable hoist or puller has two facing half shell members housing a chain sprocket rotatably affixed to a drive shaft supported for rotation by a pair of rollers. The first roller is slidably fixed for rotation with the drive shaft while the second is threaded to the shaft. The periphery of the threaded roller is serrated for engagement by a spring detent to inhibit its free rotation. Each roller has a hub portion extending outwardly of the housing to selectively receive a drive tool. A friction disc is disposed between each of the rollers and adjacent housing portion. To apply force to a load connected to the chain trained over the sprocket, the drive tool is coupled to the first roller and rotated causing the sprocket to feed the chain with the rollers pulled against the sprocket. If the drive tool released, the pull of the load tends to reversely rotate the shaft whereby the threaded arrangement causes the rollers to lock-up against the housing. To lower the load, the drive tool is coupled to the second roller and turned in the lowering direction. The shell members are retained together by a pair of upper bolts and single lower bolt. Attempts to overload the device cause elongation of the single lower bolt and resultant cocking of the housing shells so that the sides of the sprocket tend to dig into the housing to inhibit unsafe operation.