US3699756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for manufacturing steel structural parts
Assignee: EVG Entwicklungs und Verwertungs GmbH
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Filing: 1971-11-29
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Granted: 1972-10-24
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Expires: 1991-11-29
Abstract
Abstract Disclosed is an electric welding machine including an endless chain of welding heads, each head supporting opposite electrode holders for longitudinal rods and grippers for transverse rods, and cam means operable for controlling the operative and inoperative positions of the holders and grippers.
Inventors
- 👤 Klaus Ritter
- 👤 Hans Gott
- 👤 Josef Ritter
- 👤 Gerhard Ritter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; B23K11/008; B23K11/0086; B21; B21F; B21F27/00; B21F27/08; B21F27/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A machine for manufacturing steel structural parts consisting of two parallel longitudinal rods connected together by welded transverse rods, the machine comprising means for feeding the two longitudinal rods convergently, means for introducing the transverse thrust rods between the longitudinal rods and electric resistance welding heads for welding the transverse rods to the longitudinal rods, wherein several welding heads are linked together to form an endless chain which is driven continuously so that the chain follows a closed path in the plane of symmetry between the two longitudinal rods, the path of the chain having a straight welding stretch extending parallel to the plane of the two longitudinal rods, each welding head having a gripper for receiving and holding in position a transverse rod and two welding electrodes one on each side of the gripper, the two welding electrodes being arranged to move towards and away from each other, thrust devices being provided for moving the welding heads towards each other and for applying the necessary welding pressures, a feeding device being provided, on the chain path, for feeding transverse rods to the grippers, and there being means for conducting electric current to the welding electrodes.
Claim 2
Dependent Claim
196 words
A machine for manufacturing steel structural parts consisting of two parallel longitudinal rods connected together by welded transverse rods, the machine comprising means for feeding the two longitudinal rods convergently, means for introducing the transverse thrust rods between the longitudinal rods and electric resistance welding heads for welding the transverse rods to the longitudinal rods, wherein several welding heads are linked together to form an endless chain which is driven continuously so that the chain follows a closed path in the plane of symmetry between the two longitudinal rods, the path of the chain having a straight welding stretch extending parallel to the plane of the two longitudinal rods, each welding head having a gripper for receiving and holding in position a transverse rod and two welding electrodes one on each side of the gripper, the two welding electrodes being arranged to move towards and away from each other, thrust devices being provided for moving the welding heads towards each other and for applying the necessary welding pressures, a feeding device being provided, on the chain path, for feeding transverse rods to the grippers, and there being means for conducting electric current to the welding electrodes.
Claim 3
Dependent Claim
81 words
A machine according to claim 1, in which each welding head has a base part equipped with parallel guides extending perpendicular to the length of the welding head chain, the guides guiding two electrode holders, electric conductors being provided on either side of the welding stretch, for example in the form of cam rails which act on thrust rollerS mounted on the electrode holders for advancing the welding electrodes into contact with the longitudinal rods, and for applying the welding thrusts.
Claim 4
Dependent Claim
69 words
A machine according to claim 2, in which each welding head is equipped, between its two electrode holders, with a gripper having jaws operable for gripping a transverse rod, one of said jaws being provided with a cam follower and additional cam rails extending along the path of the welding head chain in contact with said cam follower controlling the closing and opening of the jaws of the gripper.
Claim 5
Dependent Claim
46 words
A machine according to any one of claims 1 to 3, in which two or more intermittent transverse wire loaders are provided, together capable of simultaneously loading transverse wires to the same number of welding heads, the loaded welding heads subsequently all receiving welding current simultaneously.
Claim 6
Dependent Claim
28 words
A machine according to claim 4, in which there are three wire loaders and the three loaded welding heads each receive one phase from a 3-phase current source.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |