Patent US4059978A successfully refreshed from Google Patents.
US4059978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube bending machine
Assignee: Individual
•
Filing: 1976-07-19
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Granted: 1977-11-29
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Expires: 1996-07-19
Abstract
Abstract Portable hydraulic tube bending machine adjustable for bend angle and adjustable to tubing with and without collars and straight and pre-bent tubes, whereby complicated bendings can be carried out at the place of use and with a minimum of space.
Inventors
- 👤 Paul Dettling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:37
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/02; B21D7/022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A tube bending machine having hydraulic drive including a hydraulic cylinder characterized by the following: a single hydraulic pressure cylinder means, a lever system, a bending roller, the lever being operative in a first partial stroke of its driving stroke so as to press a tube to be bent against the bending roller, a pivotally mounted bending arm having detent means associated therewith, and the lever system being operative in a second partial stroke to swing the pivotally mounted bending arm around the axis of rotation of the bending roller, the detent means normally restraining the bending arm and being released by the said lever system at the end of the said first partial stroke.
Claim 2
Dependent Claim
115 words
A tube bending machine having hydraulic drive including a hydraulic cylinder characterized by the following: a single hydraulic pressure cylinder means, a lever system, a bending roller, the lever being operative in a first partial stroke of its driving stroke so as to press a tube to be bent against the bending roller, a pivotally mounted bending arm having detent means associated therewith, and the lever system being operative in a second partial stroke to swing the pivotally mounted bending arm around the axis of rotation of the bending roller, the detent means normally restraining the bending arm and being released by the said lever system at the end of the said first partial stroke.
Claim 3
Dependent Claim
79 words
A tube bending machine in accordance with claim 1 characterized by the following: the bending arm being in the form of an angle having two legs and being pivotally mounted near the end of one of said legs, a lever of the said lever system being linked to one end of the second said bending arm leg, and a stop pin whereby the range of movement of the said lever with respect to the said second leg is limited.
Claim 4
Dependent Claim
66 words
A tube bending machine in accordance with claim 2 including the following: a pushrod operatively connected to the said piston rod of the hydraulic cylinder, said pushrod being connected at its other end with a second lever of the said lever system and wherein the said second lever is rotatably mounted approximately at the point of intersection of the two legs of the said bending arm.
Claim 5
Dependent Claim
59 words
A tube bending machine in accordance with claim 3 including the following: an eccentric pin having a bearing mounting, a forming rod being provided on the generated surface, the forming rod having a forming head on the end remote from the eccentric pin, said forming head being adapted to press a tube to be bent against said bending roller.
Claim 6
Dependent Claim
46 words
A tube bending machine in accordance with claim 3 characterized by the following: the said second lever having a self-latching detent means and an adjustable impact pin positioned to release the detent means whereby the swinging motion of the bending arm about its bearing is initiated.
Claim 7
Dependent Claim
28 words
A tube bending machine in accordance with claim 4 characterized by the following: detent means whereby the forming head is axially adjustable and settable in a selected position.
Claim 8
Dependent Claim
48 words
A tube bending machine in accordance with claim 4 characterized by the following: the forming head is provided with a multiplicity of forming surfaces, the forming head being rotatable with respect to the forming rod and detent means whereby the forming head is settable in a selected position.
Claim 9
Dependent Claim
37 words
A tube bending machine in accordance with claim 1 including the following: a bending gauge adjustable in accordance with the selected bending angle, said bending gauge including an adjustable parallel bar settable to a selected bending radius.
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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |