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Class Information
Number: 212/293
Name: Traversing hoists > Having snubber or boom backswing stop
Description: Subject matter wherein (a) a damper is provided to prevent sudden uncontrolled upward or backward movement of the boom* or (b) means are provided to limit upward or backward movement of the boom by direct contact.

Patents under this class:

Patent Number Title Of Patent Date Issued
8192129 Pipe handling boom pretensioning apparatus Jun. 5, 2012
7726929 Pipe handling boom pretensioning apparatus Jun. 1, 2010
6095349 Knock-down hoist Aug. 1, 2000
5676264 Hydraulic boom stop Oct. 14, 1997
5611177 Portable tower with tower member position detection system Mar. 18, 1997
5480041 Trailer-mounted crane Jan. 2, 1996
5064339 Backhoe boom lock Nov. 12, 1991
4997333 Backhoe boom lock Mar. 5, 1991
4557390 Suspended counterweight control system Dec. 10, 1985
4407629 Lifting apparatus for down-hole tubulars Oct. 4, 1983
4270663 Stop for crane boom Jun. 2, 1981
4169535 Crane Oct. 2, 1979
4043253 Boom cylinder stop for the lift cylinders of a skid steer vehicle Aug. 23, 1977
4005780 Boom stop and back hitch compensating system Feb. 1, 1977
4003474 Crane boom stop arrangement Jan. 18, 1977

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