US3812694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending machine for metal rods
Assignee: Individual
•
Filing: 1971-11-30
•
Granted: 1974-05-28
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Expires: 1991-11-30
Abstract
Abstract A bending machine for bending metal rods having a rotatable bending plate which carries a centrally disposed bending tool and at least one eccentric bending tool, means being provided for continuing angular movement of the rotatable bending plate beyond a nominal angular position in order to compensate for spring-back of a metal rod after a bend has been effected, there being impulse transmitting means actuable on rotation of the bending plate, means for counting impulses transmitted by said impulse transmitting means and means for comparing such transmitted impulses with a number of impulses pre-set in said counting means. The rotatable bending plate continues beyond the nominal bending angle by the provision of delay means which delay by a pre-selected variable period the moment at which the number of transmitted impulses corresponds to the number of impulses preset in the counting means. The period of said variable delay is proportional to the value of the nominal bending angle, the value of the ratio of the diameter of the centrally disposed bending tool to the diameter of the rod being bent and a factor, dependent upon the hardness of the rod, lying between 0.004 and 0.008.
Inventors
- 👤 P Peddinghaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/10; B21D11/12; B21D7/00; B21D7/12; Y; Y10; Y10S; Y10S72/00; Y10S72/702
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
232 words
A bending machine for bending metal rods having a rotatable bending plate which carries a centrally disposed bending tool and at least one eccentric tool, a series of electrical contact means rotatable with said bending plate and angularly spaced at positions corresponding to the nominal value of various required bends, impulse transmitting means actuable by said contact means on rotation thereof, a counter for recording impulses received from said impulse transmitting means and means for pre-setting, in said counter, a pre-determined number of impulses corresponding to any given required bending angle and means for reversing the angular movement of said bending plate so as to return it to a zero position at a moment when the number of impulses transmitted by said impulse transmitting means corresponds to the number of impulses pre-set in said counter, characterized in that, for any given nominal bending angle, means are provided for delaying, by a pre-selected variable period, the moment at which the number of impulses transmitted by said impulse transmitting means corresponds to the number of impulses pre-set in said counter, thereby permitting the bending plate to rotate through an angle greater than said nominal bending angle, the period of said delay being proportional to the value of the nominal bending angle, and the value of the ratio of the diameter of the centrally disposed bending tool to the diameter of the rod being bent.
Claim 2
Dependent Claim
232 words
A bending machine for bending metal rods having a rotatable bending plate which carries a centrally disposed bending tool and at least one eccentric tool, a series of electrical contact means rotatable with said bending plate and angularly spaced at positions corresponding to the nominal value of various required bends, impulse transmitting means actuable by said contact means on rotation thereof, a counter for recording impulses received from said impulse transmitting means and means for pre-setting, in said counter, a pre-determined number of impulses corresponding to any given required bending angle and means for reversing the angular movement of said bending plate so as to return it to a zero position at a moment when the number of impulses transmitted by said impulse transmitting means corresponds to the number of impulses pre-set in said counter, characterized in that, for any given nominal bending angle, means are provided for delaying, by a pre-selected variable period, the moment at which the number of impulses transmitted by said impulse transmitting means corresponds to the number of impulses pre-set in said counter, thereby permitting the bending plate to rotate through an angle greater than said nominal bending angle, the period of said delay being proportional to the value of the nominal bending angle, and the value of the ratio of the diameter of the centrally disposed bending tool to the diameter of the rod being bent.
Claim 3
Dependent Claim
59 words
The bending machine as claimed in claim 1 wherein said electrical contact means comprises a single contact at each of a plurality of angularly spaced positions corresponding to said nominal bending angles, the contacts being mounted on a disc rotatable with the bending plate and wherein said delaying means comprises means for angularly retarding said contacts on said disc.
Claim 4
Dependent Claim
108 words
The bending machine as claimed in claim 2 wherein each contact is mounted for movement in an arcuate slot formed in said disc and is engageable by one end of a radially extending lever pivotally connected intermediate its ends on said disc, the other ends of said levers being engageable by a rotatable adjusting member and the pivots of said levers being disposed at varying distances from the ends thereof engageable with said contacts whereby rotation of said adjusting member will simultaneously pivot said levers so that the contacts will be moved in their arcuate slots by different angular displacements dependent upon the positions of said lever pivots.
Claim 5
Dependent Claim
23 words
The bending machine as claimed in claim 3 wherein means are provided for adjusting the radial positions of the pivots of said levers.
Claim 6
Dependent Claim
60 words
The bending machine as claimed in claim 1 wherein a plurality of closely adjacent contacts are provided at each of a plurality of angular positions corresponding to a plurality of nominal bending angles and wherein said delaying means comprises means for increasing, by a pre-selected, variable amount, the number of impulses pre-set in said counter for any required bending angle.
Claim 7
Dependent Claim
39 words
The bending machine as claimed in claim 5 wherein said means for increasing the number of impulses pre-set in said counter comprises a rotatable setting member and an adjusting switch which are interconnected by means of a variable-ratio gear.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |