US3566228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-delay switch for pipe threader
Assignee: RAM TOOL CORP
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Filing: 1969-06-23
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Granted: 1971-02-23
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Expires: 1989-06-23
Abstract
Abstract A time-delay switch for a pipe threader which allows the length of threads to be cut by the pipe fitter to be adjusted and to automatically reverse the direction of the pipe threader after the desired length has been cut so as to remove the pipe threading die from the member being threaded. A time-delay is incorporated in the switch so that the drive motor may coast to a stop before reversal of the motor occurs.
Inventors
- 👤 Athanase N Tsergas
- 👤 Radames Ramirez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:22
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; H03K17/292; H02; H02P; H02P23/00; H02P23/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
212 words
A control circuit for connecting a driving means for a reversible power tool to a pair of power lines comprising, (a) first switch means connected in circuit with one power line, (b) second switch means connected in circuit with the other power line, (c) means for moving said first and second switch means to a first position to provide continuity of the power lines through said switch means, (d) latching means for holding the means for moving said first and second switch means in said first position, (e) third reversing switch means in series with the first switch in a first position and connected to one side of the driving means, (f) fourth reversing switch means in series with the second switch means in a first position and connected to the second side of the driving means, (g) a time-delay means connected to the first and second switching means, (h) a switch actuator connected to the time-delay means to actuate the third and fourth reversing switch means, (i) means for engaging the latching means to unlatch it driven by said driving means, and (j) a stop switch means connected in circuit with the motor means and engaged by the means for engaging the latching means to disconnect power to the driving means.
Claim 2
Dependent Claim
212 words
A control circuit for connecting a driving means for a reversible power tool to a pair of power lines comprising, (a) first switch means connected in circuit with one power line, (b) second switch means connected in circuit with the other power line, (c) means for moving said first and second switch means to a first position to provide continuity of the power lines through said switch means, (d) latching means for holding the means for moving said first and second switch means in said first position, (e) third reversing switch means in series with the first switch in a first position and connected to one side of the driving means, (f) fourth reversing switch means in series with the second switch means in a first position and connected to the second side of the driving means, (g) a time-delay means connected to the first and second switching means, (h) a switch actuator connected to the time-delay means to actuate the third and fourth reversing switch means, (i) means for engaging the latching means to unlatch it driven by said driving means, and (j) a stop switch means connected in circuit with the motor means and engaged by the means for engaging the latching means to disconnect power to the driving means.
Claim 3
Dependent Claim
43 words
A control circuit according to claim 1 wherein the third reversing switch means is connected in series with the second switch in a second position, and the fourth reversing switch means is connected in series with the first switch in a second position.
Claim 4
Dependent Claim
62 words
A control circuit according to claim 1 wherein said third and fourth reversing switch means each having movable contacts and a pair of stationary contacts, with the movable contact of the third reversing switch means connected to one side of the driving means, and the movable contact of the fourth reversing switch means connected to the second side of the driving means.
Claim 5
Dependent Claim
55 words
A control circuit according to claim 3 wherein one of the stationary contacts of third reversing switch means is connected to a first contact of the first switch means and the second statIonary contact of the third reversing switch means is connected to first contacts at the second switch means and the stop switch means.
Claim 6
Dependent Claim
57 words
A control circuit according to claim 3 wherein one of the stationary contacts of the fourth reversing switch means is connected to the first contacts of the second switch means and the stop switch means, and the second stationary contact of the fourth reversing switch means is connected to a second contact of said first switch means.
Claim 7
Dependent Claim
31 words
A control circuit according to claim 1 wherein said switch actuator comprises a relay having a coil and armature with the armature coupled to the third and fourth reversing switch means.
Claim 8
Dependent Claim
103 words
A control circuit according to claim 1 wherein said means for moving said first and second switch means in a first position comprises a push-to-start shaft, a housing in which said push-to-start shaft is movably mounted, a groove formed in said push-to-start shaft, said latching means comprising a locking pawl pivotally attached to said housing and engageable within said groove to lock said push-to-start shaft in a first position, and said means for engaging the latching means comprising a shaft for moving said locking pawl to move it out of said notch so that said push-to-start shaft will move to its initial position.
Claim 9
Dependent Claim
75 words
A control circuit according to claim 7 comprising a travel adjusting means mounted on said housing, comprising an adjusting shaft rotatably supported by said housing, a lug mounted on said adjusting shaft and movable to allow adjustment of travel, said shaft engageable with said lug to move the adjusting shaft relative to the housing, and a coupling pawl engageable with the locking pawl and movable by the adjusting shaft when the shaft engages the lug.
Claim 10
Dependent Claim
34 words
A control circuit according to claim 8 comprising first spring biasing means for biasing the locking pawl into said notch, and second spring biasing means for biasing the push-to-start shaft to its initial position.
Claim 11
Dependent Claim
37 words
A control circuit according to claim 9 comprising indexing means mounted on said housing and the position of the lug on the adjusting shaft relative to said indexing means indicating the length of travel of said shaft.
Claim 12
Dependent Claim
16 words
A control circuit according to claim 9 wherein said stop switch is engaged by said shaft.
Claim 13
Dependent Claim
19 words
A control circuit according to claim 11 wherein said shaft has an enlarged portion of its one end thereof.
Claim 14
Dependent Claim
18 words
A control circuit according to claim 1 wherein said time-delay means includes a charging circuit for a capacitor.
Claim 15
Dependent Claim
39 words
A control circuit according to claim 13 wherein said time-delay means comprises an electronic switch connected in circuit with the switch actuator, and said charging circuit connected in circuit with the electronic switch to control its time of actuation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |