Patent US3777525A successfully refreshed from Google Patents.
US3777525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for bending concrete-reinforcing bars
Assignee: Individual
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Filing: 1971-08-30
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Granted: 1973-12-11
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Expires: 1991-08-30
Abstract
Abstract A machine for bending concrete-reinforcing bars and the like is provided with automatic electric sequence control means for performing a desired sequence of bending operations of selected predetermined bending angles. The machine has slip rings of angular extents corresponding to the selectable angles and a contact drum cooperating with these. On the drum are a series of sets of pairs of selectable contacts; each set corresponds to one bending operation and the selected contact pair in the set cooperates with a corresponding slip ring to determine the bending angle for that operation. The drum is stepwise rotated to effect the sequence of operations. To compensate for elastic relaxation of the bar after bending, the bending may be continued beyond the predetermined angle by a further angle determined by measurement of energy absorption, or current consumption, or a time interval, for bending in the elastic range of the bar material. Means for effecting such compensation automatically are described.
Inventors
- 👤 C Peddinghaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:32
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/12; Y; Y10; Y10S; Y10S72/00; Y10S72/702
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
142 words
A bending machine for bars, wire and sections of steel and the like materials including a bending platen which supports bending tools, said platen being rotatable and directionally controllably driven, setting means for different principal bending angles, said setting means having elements which correspond to the specified principal bending angles and which can be actuated in any desired sequence, and means comprising an electrically operated control system for automatically continuing a bending operation beyond a set principal bending angle to compensate for deviations between the actual bending angle achieve and the required bending angle which may otherwise occur, each individual principal bending operation being continued by a supplementary bending angle which is determined by measurement of at least part of the energy or current of a motor driving the bending platen in the elastic deformation range of the material to be bent.
Claim 2
Dependent Claim
142 words
A bending machine for bars, wire and sections of steel and the like materials including a bending platen which supports bending tools, said platen being rotatable and directionally controllably driven, setting means for different principal bending angles, said setting means having elements which correspond to the specified principal bending angles and which can be actuated in any desired sequence, and means comprising an electrically operated control system for automatically continuing a bending operation beyond a set principal bending angle to compensate for deviations between the actual bending angle achieve and the required bending angle which may otherwise occur, each individual principal bending operation being continued by a supplementary bending angle which is determined by measurement of at least part of the energy or current of a motor driving the bending platen in the elastic deformation range of the material to be bent.
Claim 3
Dependent Claim
53 words
The bending machine according to claim 1 wherein an electric control circuit is provided for each bending operation, adapted to trigger setting means elements corresponding to principal bending angles, specified as desired, each control circuit being associated with one bending angle, the whole of the control circuits corresponding to the bending sequence programme.
Claim 4
Dependent Claim
22 words
The bending machine according to claim 2 wherein the setting means is a disc which rotates in accordance with the bending angle.
Claim 5
Dependent Claim
33 words
The bending machine according to claim 3 wherein contactors, corresponding to the principal bending angles, are provided on the disc, said contactors being rendered operative or inoperative by the control circuit in use.
Claim 6
Dependent Claim
69 words
The bending machine according to claim 4 wherein the control circuits are variable in that a plurality of contacts and an adjusting switch, driven in steps, are provided by means of which the contacts corresponding to a specified individual bending operation may be connected with a control pulse voltage and that the contacts control the motor driving the bending platen by means of contactors disposed on the setting means.
Claim 7
Dependent Claim
114 words
The bending machine according to claim 1 wherein from the moment at which the motor is switched on to the time at which a given energy or current consumption in the elastic deformation range is reached, a control motor, constructed as synchronous motor or stepping motor, is driven and is then once again switched on, after the specified principal bending angle is reached, and is rotated in the reverse direction through the angle of rotation taken up by it during the period for which it was initially switched on, said control motor being adapted to retain the first named motor in the switched on condition until said control motor returns into its starting position.
Claim 8
Dependent Claim
63 words
The bending machine according to claim 1 wherein the energy or current consumption is differentiated with respect to the bending angle in the elastic deformation range of the material to be bent and said differential quotient is integrated with respect to the entire principal bending operation, the adjustment of the setting means being varied relative to the instantaneous value of the aforementioned integral.
Claim 9
Dependent Claim
41 words
The bending machine according to claim 1 wherein the motor is a synchronous motor, connected to measuring means for measuring the displacement angle between its rotor and stator poles and whose measured value is then stored during the entire bending operation.
Claim 10
Independent Claim
263 words
A method for bending bars, wire and sections of steel and like materials on a bending platen supporting bending tools, with the platen being rotatable and directionally controllably driven and having setting means for differEnt principal bending angles including elements corresponding to the specified principal angles and actuable in any desired sequence, and an electrically operated control system for automatically continuing a bending operation beyond a set principal bending angle to compensate for deviations between the actual bending angle achieved and the required bending angle which may otherwise occur, each individual principal bending operation being continued by a supplementary bending angle which is determined by measurement of at least part of the energy or current consumption of a motor driving the bending platen in the elastic deformation range of the material to be bent, with the energy or current consumption being differentiated with respect to the bending angle in the elastic deformation range of the material to be bent and the differential quotient being integrated with respect to the entire principal bending operation, and the adjustment of the setting means being varied relative to the instantaneous value of mentioned integral, the improvement comprising storing a quantity corresponding to the differential quotient of the energy or current consumption with respect to the bending angle as set value within a brief period of time, following onto at least the beginning of the bending operation and retained until the bending operation is completed and the specified principal bending angle reached, and maintaining the drive switched on for a period of time corresponding to the set value.
Claim 11
Independent Claim
263 words
A method for bending bars, wire and sections of steel and like materials on a bending platen supporting bending tools, with the platen being rotatable and directionally controllably driven and having setting means for differEnt principal bending angles including elements corresponding to the specified principal angles and actuable in any desired sequence, and an electrically operated control system for automatically continuing a bending operation beyond a set principal bending angle to compensate for deviations between the actual bending angle achieved and the required bending angle which may otherwise occur, each individual principal bending operation being continued by a supplementary bending angle which is determined by measurement of at least part of the energy or current consumption of a motor driving the bending platen in the elastic deformation range of the material to be bent, with the energy or current consumption being differentiated with respect to the bending angle in the elastic deformation range of the material to be bent and the differential quotient being integrated with respect to the entire principal bending operation, and the adjustment of the setting means being varied relative to the instantaneous value of mentioned integral, the improvement comprising storing a quantity corresponding to the differential quotient of the energy or current consumption with respect to the bending angle as set value within a brief period of time, following onto at least the beginning of the bending operation and retained until the bending operation is completed and the specified principal bending angle reached, and maintaining the drive switched on for a period of time corresponding to the set value.
Claim 12
Dependent Claim
75 words
The method according to claim 9 including increasing the set value at the same rate of change as in the brief period of time following on to the beginning of the bending operation and for the duration of the entire bending operation until the specified principal bending angle is reached, and after the specified principal bending angle is reached maintaining the drive switched on for a period of time corresponding to the increased set value.
Claim 13
Dependent Claim
51 words
The method according to claim 9 including terminating the determination of the quantity corresponding to the energy or current consumption or the displacement angle as soon as the electrical quantity or its differential quotient with respect to the bending angle deviates by a specified small amount from its initially determined value.
Claim 14
Dependent Claim
91 words
The bending machine according to claim 1 wherein there is provided a timer which is arranged to maintain the drive of the bending platen after a set principal bending angle has been reached for a period of time preset on said timer and defined for any given principal bending angle by a time dependent upon the no-load speed of the platen together with a supplementary time which is related to the velocity drop of the platen under load and to the amount of elastic deformation suffered by the material being bent.
Claim 15
Dependent Claim
39 words
The bending machine as claimed in claim 12 wherein the timer is so arranged that it is not switched on until the bending platen has turned through an angle of at least 3* from the zero or start position.
Claim 16
Dependent Claim
23 words
The bending machine as claimed in claim 12 wherein there is provided a limit switch for controlling the return of the bending platen.
Claim 17
Dependent Claim
31 words
The bending machine as claimed in claim 12 wherein there are provided further switches disposed on either side of the zero position of said bending platen for switching on the timer.
Claim 18
Dependent Claim
31 words
The bending machine as claimed in claim 17 wherein said further switches are actuable during the return traverse of the bending platen to switch off the drive of said bending platen.
References Cited (Backward Citations)
GB889179A
Cited
US3156287A
Cited
US3352136A
Cited
US3459018A
Cited
US3393543A
Cited
US3653251A
Cited
US3512383A
Cited
US3670541A
Cited
US3661002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |