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Class Information
Number: 16/62
Name: Miscellaneous hardware > Checks and closers > Liquid > Spring and gear
Description: Devices in which the closing devices include springs and gear elements.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8186010 Retracting mechanism and fixing structure May. 29, 2012
8001654 Withdrawing mechanism Aug. 23, 2011
7815023 Drive device for opening or closing a door or similar Oct. 19, 2010
7364023 Device for slowing the movement of a drawer or similar movable member, having releasable locking means Apr. 29, 2008
7051403 Electromechanical swing leaf operator May. 30, 2006
7024725 Overhead door closer with slide arm assembly Apr. 11, 2006
7016492 Magnetic hinge apparatus Mar. 21, 2006
7007342 Door closer Mar. 7, 2006
6681525 Handicapped train-station gate Jan. 27, 2004
6618899 Door closer and method of producing a door closer Sep. 16, 2003
6510586 Door closer Jan. 28, 2003
6266847 Door operator and process for operation of a door operator Jul. 31, 2001
6262548 Door drive for a pivot-hung door Jul. 17, 2001
6154924 Door closer unit Dec. 5, 2000
6151753 Door closer to generate a sudden change in the transmission ratio during the closing phase Nov. 28, 2000
6047440 Non-rotating pinion cap Apr. 11, 2000
5943736 Door closer Aug. 31, 1999
5802670 Door closer Sep. 8, 1998
5553353 Door damping system Sep. 10, 1996
5535514 Method for making a hydraulic door closer having a one-piece molded housing body Jul. 16, 1996
5502874 Speed regulating valve for fluid filled door closers Apr. 2, 1996
5343593 Door closer Sep. 6, 1994
5272787 Overhead concealed door closer, mechanically, hydraulically operated Dec. 28, 1993
5265306 Automatic door closing device Nov. 30, 1993
5259090 Fluid door closer with means to permit entrapped gases to move Nov. 9, 1993
5219372 Door accessory with a hydraulic retarding device Jun. 15, 1993
5206971 Apparatus and method for increasing the efficiency of a door closer by reducing friction therein May. 4, 1993
5001809 Door apparatus with damper switch Mar. 26, 1991
4999872 Door closer Mar. 19, 1991
4979261 Variable position door closer Dec. 25, 1990
4967444 Device for damping the closing movement of a dual door spring-loaded or closure and closure control therefor Nov. 6, 1990
4937914 Door control device Jul. 3, 1990
4793023 Door closer and holder Dec. 27, 1988
4763385 Door closure transmission utilizing an eccentric pinion Aug. 16, 1988
4744125 Door closer transmission including an eccentric pinion May. 17, 1988
4686739 Door closer Aug. 18, 1987
4665583 Door closer piston assembly having separate head portions May. 19, 1987
4653229 Holding installation for double doors Mar. 31, 1987
4502180 Door control device having piston assembly with separately formed rack Mar. 5, 1985
4455708 Door closer having a braking mechanism comprising an elastomeric bag Jun. 26, 1984
4419786 Door closer assembly Dec. 13, 1983
4414703 Door closer and holder Nov. 15, 1983
4394787 Hydraulic door closer construction Jul. 26, 1983
4387482 Modular single or double action door closure system Jun. 14, 1983
4378612 Door closer delayed action speed control system Apr. 5, 1983
4339843 Door closer with assist or door operating features Jul. 20, 1982
4263694 Door closer Apr. 28, 1981
4234996 Automatic door closer constructed for releasably holding a door in a predetermined partly open position Nov. 25, 1980
4222147 Door closer with assist or door operating features Sep. 16, 1980
4160304 Hold-open accessory for a door closer Jul. 10, 1979

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