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Class Information
Number: 267/119
Name: Spring devices > Fluid > Expansible-contractible chamber device > Press cushion
Description: Spring device for minimizing the force of impact in the shaping operation apparatus utilizing a high degree of impactive force (e.g., sheet metal drawing apparatus).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7287409 |
Die cushion device |
Oct. 30, 2007 |
| 7270318 |
Device at an energy accumulating piston-cylinder tool |
Sep. 18, 2007 |
| 7121538 |
Arrangement at a press tool for breaking the piston/piston rod of a gas spring |
Oct. 17, 2006 |
| 7083164 |
Cushion and cushion cylinder for ram or bolster of a press |
Aug. 1, 2006 |
| 6971303 |
Method and device at a piston-cylinder device |
Dec. 6, 2005 |
| 6941789 |
Die cushion device |
Sep. 13, 2005 |
| 6915879 |
Main shaft balancing device for machine tool |
Jul. 12, 2005 |
| 6749185 |
Cushion assembly and method |
Jun. 15, 2004 |
| 6729173 |
Hydraulic draw press arrangement |
May. 4, 2004 |
| 6663089 |
Hydraulic cylinder with boosting function |
Dec. 16, 2003 |
| 6516696 |
Sleeve-type gas spring |
Feb. 11, 2003 |
| 6491143 |
Low impact gas spring |
Dec. 10, 2002 |
| 6460396 |
Power press |
Oct. 8, 2002 |
| 6457702 |
Annular bellows unit for vehicle suspension |
Oct. 1, 2002 |
| 6412616 |
Energy dissipation system |
Jul. 2, 2002 |
| 6390457 |
Soft-start, soft-return gas spring |
May. 21, 2002 |
| 6332602 |
Vehicle suspension having annular air chamber |
Dec. 25, 2001 |
| 6322059 |
Low contact force spring |
Nov. 27, 2001 |
| 6237381 |
Power press ram force modulation and apparatus for use therewith |
May. 29, 2001 |
| 6170809 |
Delay return gas spring |
Jan. 9, 2001 |
| 6145819 |
Die cylinder and manifold and system |
Nov. 14, 2000 |
| 6131497 |
Gas cylinder with time delay |
Oct. 17, 2000 |
| 6068245 |
Apparatus and method for cushioning the action of draw dies operating in a stamping press and the like |
May. 30, 2000 |
| 6059273 |
Gas spring arrangement |
May. 9, 2000 |
| 6022004 |
Self-lubricating fluid cylinder |
Feb. 8, 2000 |
| 5813275 |
Safety circuit for press die cushion |
Sep. 29, 1998 |
| 5735201 |
Apparatus including mutually communicating hydraulic cylinders for even distribution of blank-holding force on pressing machine |
Apr. 7, 1998 |
| 5660379 |
Pneumatic spring |
Aug. 26, 1997 |
| 5623848 |
Pressing method and system wherein cushion platen is lowered by cooperation of shock absorbers and cylinders before holding of blank between die and pressure ring |
Apr. 29, 1997 |
| 5588641 |
Gas spring which after compression has a time delayed return to its original length |
Dec. 31, 1996 |
| 5549281 |
Liquid spring for punch press |
Aug. 27, 1996 |
| 5499525 |
Hydraulic drive for a sheet metal forming press |
Mar. 19, 1996 |
| 5480128 |
Gas spring with threaded mount and method of producing the same |
Jan. 2, 1996 |
| 5472071 |
Shock-absorbing strut for hydraulic wheel-drive unit |
Dec. 5, 1995 |
| 5465811 |
Self-contained gas cylinder |
Nov. 14, 1995 |
| 5454549 |
Spring device |
Oct. 3, 1995 |
| 5452883 |
Gas spring |
Sep. 26, 1995 |
| 5437436 |
Stand-alone gas spring |
Aug. 1, 1995 |
| 5435530 |
Gas spring which after compression has a time delayed return to its original length |
Jul. 25, 1995 |
| 5386975 |
Gas die cylinders |
Feb. 7, 1995 |
| 5344125 |
Gas spring with filler valve |
Sep. 6, 1994 |
| 5339932 |
Apparatus and method to cushion movement of a member |
Aug. 23, 1994 |
| 5318281 |
Self contained gas spring and die cylinder |
Jun. 7, 1994 |
| 5314172 |
High pressure die cylinder and manifold system |
May. 24, 1994 |
| 5299444 |
Hydraulic cushioning system for press, having hydraulic power supply including means for adjusting initial pressure to be applied to pressure-pin cylinders |
Apr. 5, 1994 |
| 5265852 |
Gas spring with gas passageways in the assembly housing and piston rod |
Nov. 30, 1993 |
| 5220820 |
Apparatus and method for cushioning movement of a member in a press |
Jun. 22, 1993 |
| 5197718 |
Self-contained gas springs interchangeable with coil springs |
Mar. 30, 1993 |
| 5172892 |
Self contained gas spring |
Dec. 22, 1992 |
| 5150598 |
Apparatus for scribing grain-oriented electrical steel strip |
Sep. 29, 1992 |
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