Low impact spot welding cylinder with dual pistons

Electric heating – Metal heating – For bonding with pressure

Reexamination Certificate

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Details

C219S091200

Reexamination Certificate

active

11010622

ABSTRACT:
The present invention provides a weld cylinder having a dual piston arrangement. The cylinder has a middle separator separating the cylinder into two cavities. A retract piston assembly is arranged within one cavity. One of the pistons is arranged in the retract piston assembly and the other piston is arranged in the cavity without the retract piston assembly. The pistons support a rod that is moveable between home, intermediate, work, and advanced work positions. The rod moves rapidly from the home position to the intermediate position. However, the rod moves more slowly from the intermediate position to the work position to reduce the impact force. A cushion valve and cushion trip valve cooperate to increase the rate at which the rod moves from the work position to the advanced position so that the weld force increases rapidly to minimize increases in cycle time. The cushion valve is supported by the retract piston assembly, and the cushion trip valve is supported by the middle separator. With both the cushion valve and cushion trip valve moved from closed positions to open positions, the rate of fluid flow through the retract piston assembly increases to increase the rate at which the piston moves within the retract piston assembly.

REFERENCES:
patent: 2370009 (1945-02-01), Clark et al.
patent: 2831464 (1958-04-01), Lillquist
patent: 2851583 (1958-09-01), Sciaky
patent: 3150563 (1964-09-01), Carrigan et al.
patent: 3400242 (1968-09-01), Waller
patent: 3417221 (1968-12-01), Hayward
patent: 3585347 (1971-06-01), Needham
patent: 3609285 (1971-09-01), Scarpelli
patent: 3708648 (1973-01-01), Croucher et al.
patent: 4028522 (1977-06-01), Chihoski et al.
patent: 4135076 (1979-01-01), Beneteau
patent: 4183509 (1980-01-01), Nishikawa et al.
patent: 4296304 (1981-10-01), Defourny
patent: 4296679 (1981-10-01), Mattsson
patent: 4419558 (1983-12-01), Stiebel
patent: 4441006 (1984-04-01), Machida et al.
patent: 4447700 (1984-05-01), Cohen
patent: 4596917 (1986-06-01), Nied et al.
patent: 4700611 (1987-10-01), Kaneko
patent: 4861960 (1989-08-01), Haefner et al.
patent: 5174191 (1992-12-01), Leinweber et al.
patent: 5177337 (1993-01-01), Ward
patent: 5191825 (1993-03-01), Beneteau et al.
patent: 5194709 (1993-03-01), Ichikawa et al.
patent: 5275540 (1994-01-01), Brown
patent: 5349151 (1994-09-01), Eisbrenner et al.
patent: 5393950 (1995-02-01), Killian
patent: 5558785 (1996-09-01), Killian et al.
patent: 5587091 (1996-12-01), Kawagoe et al.
patent: 5623861 (1997-04-01), Ward et al.
patent: 5632912 (1997-05-01), Cecil
patent: 5808266 (1998-09-01), Cecil
patent: 6020569 (2000-02-01), Cecil et al.
patent: 6043449 (2000-03-01), Kanjo
patent: 6067696 (2000-05-01), Cecil et al.
patent: 6072145 (2000-06-01), Suita et al.
patent: 6118095 (2000-09-01), Nagano
patent: 6232572 (2001-05-01), Kanjo
patent: 6274840 (2001-08-01), Kanjo
patent: 6313427 (2001-11-01), Suita
patent: RE37607 (2002-03-01), Cecil
patent: 6408740 (2002-06-01), Holt et al.
patent: 6414259 (2002-07-01), Kanjo
patent: 6633015 (2003-10-01), Nguyen et al.
patent: 6722257 (2004-04-01), Yoh et al.
patent: 1398105 (2004-03-01), None
patent: 08-309552 (1996-11-01), None
International Search Report, Dec. 2, 2005.

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