US3710787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermittent traction apparatus
Assignee: Medidyne Inc
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Filing: 1971-06-24
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Granted: 1973-01-16
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Expires: 1991-06-24
Abstract
Abstract An intermittent traction apparatus is provided having an electric motor which pivots on its own shaft in such a manner that when the motor is running in a forward direction and traction is being applied to the patient, the motor itself pivots in order to close a normally open switch. When the motor is directed to turn in a reverse direction, the direction of its torque pivots the motor away from the switch, permitting the switch to open thus cutting off the circuit and stopping the rotation of the motor. An electric circuit is provided which includes a separate circuit for causing the motor to apply tension to the patient and another circuit releasing such tension, and a gate circuit controlled by a timer switches from the one circuit to the other in a manner to apply the traction intermittently.
Inventors
- 👤 R Rabjohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:35
CPC Classifications
A; A61; A61H; A61H1/00; A61H1/02; A61H1/0218
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
191 words
In an intermittent traction device, the combination which comprises: a. a support, b. a winch mounted on said support, c. flexible elongated tensioning means arranged to be wrapped around said winch and connected to apply tension to the patient, d. an electric motor operable forwardly and in reverse connected to rotate said winch, e. circuit means including an electric circuit connecting electric current to drive said motor, f. control means in said electric circuit for controlling the amount of electric current conducted to said motor to control the amount of torque applied by said winch to said flexible elongated tensioning means, g. means turnably mounting said motor on said support whereby said motor has capacity to turn physically to and fro about its axis in response to exertion and release of torque by said winch, h. switch means arranged to close said circuit in response to said turning movement of said motor in said forward direction, i. means for reversing said motor to release said torque, and j. means whereby said motor is turned and said switch means is actuated to open said circuit in response to release of said torque.
Claim 2
Dependent Claim
191 words
In an intermittent traction device, the combination which comprises: a. a support, b. a winch mounted on said support, c. flexible elongated tensioning means arranged to be wrapped around said winch and connected to apply tension to the patient, d. an electric motor operable forwardly and in reverse connected to rotate said winch, e. circuit means including an electric circuit connecting electric current to drive said motor, f. control means in said electric circuit for controlling the amount of electric current conducted to said motor to control the amount of torque applied by said winch to said flexible elongated tensioning means, g. means turnably mounting said motor on said support whereby said motor has capacity to turn physically to and fro about its axis in response to exertion and release of torque by said winch, h. switch means arranged to close said circuit in response to said turning movement of said motor in said forward direction, i. means for reversing said motor to release said torque, and j. means whereby said motor is turned and said switch means is actuated to open said circuit in response to release of said torque.
Claim 3
Dependent Claim
21 words
The intermittent traction device defined in claim 1, wherein said motor is mounted for rotation bodily around its own drive shaft.
Claim 4
Dependent Claim
21 words
The intermittent traction device defined in claim 1, wherein means are provided for continuously urging said switch toward its open position.
Claim 5
Dependent Claim
41 words
The intermittent traction device defined in claim 1, wherein said circuit includes a holding circuit which energizes said motor to produce torque, and a rest circuit which releases the application of energy to said motor to reduce or release said torque.
Claim 6
Dependent Claim
27 words
The intermittent traction device defined in claim 4, wherein gate circuitry is provided for automatically switching back and forth between said holding circuit and said resting circuit.
Claim 7
Dependent Claim
34 words
The intermittent traction device defined in claim 4, wherein a timer is connected to said gate circuitry in a manner to control the duration of effectiveness of said holding circuit and said resting circuit.
Claim 8
Dependent Claim
31 words
The intermittent traction device defined in claim 4, whereing a torque control circuit is provided in combination with the holding circuit for controlling the amount of torque applied by the motor.
Claim 9
Dependent Claim
65 words
The intermittent traction device defined in claim 7, wherein a normally open switch is provided in said torque circuit, and is closed by the motor under the influence of its own torque, and wherein means are provided for reversing the direction of the motor, whereby the motor releases said normally open switch and the traction connection to the patient is relieved automatically of its tension.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |