US3670541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending machine
Assignee: Individual
•
Filing: 1970-04-20
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Granted: 1972-06-20
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Expires: 1990-04-20
Abstract
Abstract A bending machine for bars, wires and sections of steel and like materials having a bending plate which supports a pair of bending tools and which is rotatable and drivable in controlled directions, there being also provided a setting member connected to the bending plate for setting various principal bending angles. At least one of the bending tools is provided with switch means which are sensitive to the load applied at the beginning of bending and after reaching the pre-determined principal bending angle keep the drive to the bending plate switched on until the bending plate has achieved an additional bending angle which corresponds to the angle of rotation of the bending plate from the beginning of switching-on until the response of the switch means.
Inventors
- 👤 Carl Ullrich Peddinghaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:08
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
187 words
A bending machine for bars, wires and sections of steel and like materials, having a bending plate which supports a pair of bending tools, and drive means for rotating said bending plate in either direction of rotation, there being also provided a setting member connected to the bending plate for setting various principal bending angles characterized in that at least one of said bending tools is provided with switch means which are sensitive to the load applied to said one bending tool at the beginning of a bend so as to be movable by such load from an initial, at rest, condition to a second condition, said switch means being connected to said drive means and being arranged to maintain said drive means in operation to continue rotation of said bending plate after the latter has reached a pre-set bending angle until said bending plate has rotated through an additional bending angle which corresponds to the angle it rotates through initially between the time said drive means is first actuated and the time when said switch means achieves said second condition consequent upon application of said load.
Claim 2
Dependent Claim
187 words
A bending machine for bars, wires and sections of steel and like materials, having a bending plate which supports a pair of bending tools, and drive means for rotating said bending plate in either direction of rotation, there being also provided a setting member connected to the bending plate for setting various principal bending angles characterized in that at least one of said bending tools is provided with switch means which are sensitive to the load applied to said one bending tool at the beginning of a bend so as to be movable by such load from an initial, at rest, condition to a second condition, said switch means being connected to said drive means and being arranged to maintain said drive means in operation to continue rotation of said bending plate after the latter has reached a pre-set bending angle until said bending plate has rotated through an additional bending angle which corresponds to the angle it rotates through initially between the time said drive means is first actuated and the time when said switch means achieves said second condition consequent upon application of said load.
Claim 3
Dependent Claim
21 words
A bending machine according to claim 1 characterized in that said setting member has setting elements which have a variable position.
Claim 4
Dependent Claim
35 words
A bending machine according to claim 1 characterized in that the setting member has setting elements, there being also provided a switch feeler which coacts with said setting elements and which has a variable position.
Claim 5
Dependent Claim
22 words
A bending machine according to claim 1 characterized in that said setting member has a variable position relative to the bending plate.
Claim 6
Dependent Claim
123 words
A bending machine according to claim 1 characterized in that said setting member includes impulse transmitters arranged to coact with an electrical impulse contact, there being also provided further impulse transmitters which are respectively associated with principal bending angles and with the initial position of the bending plate, the principal bending angle required being pre-settable by means of an electrical switch feeler to a number of impulses corresponding to said required principal bending angle, said switch feeler or a step-by-step switch associated with it being automatically switched to a greater number of impulses during a period from the time when said drive means is first actuated to a time when said switch means achieves said second condition consequent upon application of said load.
Claim 7
Dependent Claim
64 words
A bending machine according to claim 5 characterized in that the impulse transmitters are arranged only in intermediate connection with one principal bending angle as well as in the intermediate vicinity of the initial position of the setting member on both sides of the initial position of the setting member, no more impulse transmitters being provided than in connection with one principal bending angle.
Claim 8
Dependent Claim
30 words
A bending machine according to claim 1 characterized in that said switch means only achieve said second condition when a pre-set minimum bending strain of the bending tools is exceeded.
Claim 9
Dependent Claim
44 words
A bending machine according to claim 7 characterized in that the switch means are strain resistors connected to the bending tools, said strain resistors being components of resistance bridges, whose diagonal voltage is supplied to an amplifier and from there to a switch relay.
Claim 10
Dependent Claim
28 words
A bending machine according to claim 7 characterized in that said switch means comprise contacts which switch on a relayed circuit when compressive-loading of the bending tools occurs.
Claim 11
Dependent Claim
71 words
A bending machine according to claim 7 characterized in that said switch means consist of a magnetostrictive material forming the bending tools or contained in them, and of a coil acting on a relay circuit provided in the region of the support of the bending tools, the alterations of the value of the magnetic property which occurs with a compressive or bending strain bringing about an actuation of the switch relay.
Claim 12
Dependent Claim
144 words
A bending machine for bars, wire and profiles of steel and like materials having a bending plate which supports a pair of bending tools and drive means for rotating said bending plate in either direction of rotation, there being also provided a setting member connected to the bending plate for setting various principal bending angles characterized in that said drive means is connected to a tacho-generator, the potential of which is fed to a comparator circuit, which on failing to reach a pre-determined reference potential actuates a switch which switches off a storing circuit in which a value is stored, said value corresponding to the angle of rotation Of the bending plate from the switching-on of said drive means until the loading of said drive means at the beginning of bending, the value stored, corresponding to this angle, delaying the switching-off of the drive.
Claim 13
Dependent Claim
144 words
A bending machine for bars, wire and profiles of steel and like materials having a bending plate which supports a pair of bending tools and drive means for rotating said bending plate in either direction of rotation, there being also provided a setting member connected to the bending plate for setting various principal bending angles characterized in that said drive means is connected to a tacho-generator, the potential of which is fed to a comparator circuit, which on failing to reach a pre-determined reference potential actuates a switch which switches off a storing circuit in which a value is stored, said value corresponding to the angle of rotation Of the bending plate from the switching-on of said drive means until the loading of said drive means at the beginning of bending, the value stored, corresponding to this angle, delaying the switching-off of the drive.
Claim 14
Dependent Claim
27 words
A bending machine according to claim 11 characterized in that the stored value consists of impulses, the number of which is proportional to the angle of rotation.
Claim 15
Dependent Claim
25 words
A bending machine according to claim 11 characterized in that the stored value consists of a potential, which is proportional to the angle of rotation.
Claim 16
Dependent Claim
66 words
A bending machine according to claim 11 characterized in that the storage member is a switch feeler of a drive starting-switch, actuated by means of impulses or the potential, which then switches on the drive beyond the pre-set principal bending angle until an additional bending angle has been achieved which corresponds to the value of the angle of rotation stored at the beginning of the drive.
Claim 17
Dependent Claim
31 words
A bending machine according to claim 11 characterized in that the value stored changes the position of the setting elements on the setting member by a value of the same angle.
Claim 18
Dependent Claim
33 words
A bending machine according to claim 11 characterized in that the stored value changes the position of the setting member in relation to the bending plate, by a value of the same angle.
Claim 19
Dependent Claim
35 words
A bending machine according to claim 11 characterized in that the stored value changes the position of a switch feeler which can be co-ordinated with the setting elements, by an amount of the same angle.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |