US3828652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-up locking cylinder
Assignee: Individual
•
Filing: 1972-12-15
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Granted: 1974-08-13
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Expires: 1992-12-15
Abstract
Abstract A compressed air or hydraulic fluid cylinder for attaching a back-up electrode in resistance welding operation containing two pistons with corresponding piston rods. Compressed air entering through a port in the cylinder holds the two pistons in the normal inactive position. When the pistons are activated, pressurized non compressible fluid acts upon the front piston and extends its piston rod until contact is made with the welding work. The pressure at the welding point is maintained by means of the rear piston which is activated by compressed air to lock the existing pressure against the front cylinder. For recycling the procedure is repeated.
Inventors
- 👤 D Beneteau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:07
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/31
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
236 words
A high pressure source operated cylinder for attaching a back-up resistance welding electrode thereto, comprising a cylinder; a front piston and piston rod, within said cylinder; a rear locking piston and piston rod terminating in a sealing washer, within said cylinder; a fixed separator block between said pistons within which said locking piston rod slides; a chamber within the separator block provided with an intake port in its wall for the entry of pressurized hydraulic fluid for providing the pressure for the downward stroke of the front piston, and exit port centrally located in the base of said separator block, being opened and closed by said sealing washer, through which the said hydraulic fluid passes to the front piston until shut off by said sealing washer; a fixed guiding block within said cylinder in which slides the front piston rod; a compressed air intake port in the wall of the cylinder located between the front piston and said guiding block, to provide pressure to the front piston for its return stroke; a mounting base at the rear of the cylinder containing therein a compressed air intake port which supplies the pressure to the locking piston for its downward locking stroke; and a manifold attached to the outer wall of the cylinder for transferring the pressurized air contained between the front piston and the guiding block, to the underside of the locking piston for its return stroke.
Claim 2
Dependent Claim
236 words
A high pressure source operated cylinder for attaching a back-up resistance welding electrode thereto, comprising a cylinder; a front piston and piston rod, within said cylinder; a rear locking piston and piston rod terminating in a sealing washer, within said cylinder; a fixed separator block between said pistons within which said locking piston rod slides; a chamber within the separator block provided with an intake port in its wall for the entry of pressurized hydraulic fluid for providing the pressure for the downward stroke of the front piston, and exit port centrally located in the base of said separator block, being opened and closed by said sealing washer, through which the said hydraulic fluid passes to the front piston until shut off by said sealing washer; a fixed guiding block within said cylinder in which slides the front piston rod; a compressed air intake port in the wall of the cylinder located between the front piston and said guiding block, to provide pressure to the front piston for its return stroke; a mounting base at the rear of the cylinder containing therein a compressed air intake port which supplies the pressure to the locking piston for its downward locking stroke; and a manifold attached to the outer wall of the cylinder for transferring the pressurized air contained between the front piston and the guiding block, to the underside of the locking piston for its return stroke.
Claim 3
Dependent Claim
32 words
A cylinder such as described in claim 1 in combination with a tank containing a hydraulic fluid under pressure, said tank being directly connected with the intake port of said separator block.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |