US3579793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power tool for thread inserts
Assignee: Microdot Inc
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Filing: 1968-09-24
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Granted: 1971-05-25
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Expires: 1988-09-24
Abstract
Abstract The power tool has a shaft which engages and advances an insert into an aperture of a workpiece in one direction of rotation and screws the threaded end of the shaft from the insert in the other direction of rotation. The distance of advancement of the insert and the threaded aperture of the workpiece is controlled by a stop collar that is adjustable on the exterior of the tool for causing cam means to interrupt the drive of the shaft when the insert has been advanced a required distance.
Inventors
- 👤 Charles A Williams
- 👤 Richard E Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:11
CPC Classifications
B; B25; B25B; B25B27/00; B25B27/14; B25B27/143; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53687; Y10T29/53691
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
167 words
In a motor driven power tool for applying an insert to a threaded aperture of a workpiece, a rotatable shaft having a threaded end and a slot in the end, a body having an internal thread engaged by said shaft thread, a sleeve slidable over said body which prevents the body from rotating, a threaded collar on the end of the body extending beyond a recessed portion in which the insert can be placed and through which the threaded end is advanced by said thread engagement until said end slot engages a tang on the forward end of the insert which is rotated and advanced therewith, an adjustable stop on said body engageable by the sleeve near the end of the advancement of the insert into the aperture of a workpiece, and a clutch at the end of the shaft opposite to that having the thread which disconnects the drive to the shaft as the shaft continues to advance after the advancement of the sleeve is interrupted.
Claim 2
Dependent Claim
167 words
In a motor driven power tool for applying an insert to a threaded aperture of a workpiece, a rotatable shaft having a threaded end and a slot in the end, a body having an internal thread engaged by said shaft thread, a sleeve slidable over said body which prevents the body from rotating, a threaded collar on the end of the body extending beyond a recessed portion in which the insert can be placed and through which the threaded end is advanced by said thread engagement until said end slot engages a tang on the forward end of the insert which is rotated and advanced therewith, an adjustable stop on said body engageable by the sleeve near the end of the advancement of the insert into the aperture of a workpiece, and a clutch at the end of the shaft opposite to that having the thread which disconnects the drive to the shaft as the shaft continues to advance after the advancement of the sleeve is interrupted.
Claim 3
Dependent Claim
48 words
In a motor driven power tool as recited in claim 1, wherein a reversible motor drives the shaft through said clutch, and means for reversing the motor to reengage the clutch and to drive the shaft in a reverse direction to screw the threaded end from the insert.
Claim 4
Dependent Claim
26 words
In a motor driven power tool as recited in claim 2, wherein an adjustable ring on the body limits the advancement of the sleeve relative thereto.
Claim 5
Dependent Claim
40 words
In a motor driven power tool as recited in claim 3, wherein upon engagement of the sleeve with the ring, the shaft continues to rotate and advance until the clutch is disengaged to interrupt the shaft rotation and its advancement.
Claim 6
Dependent Claim
37 words
In a motor driven power tool as recited in claim 4, wherein the interruption of the drive for the shaft by the clutch produces a clicking sound to apprise the operator of the completion of the operation.
Claim 7
Dependent Claim
47 words
In a motor driven power tool as recited in claim 1, wherein the threaded end moves out of engagement with the thread of the body upon the advancement of the insert within the thread of the aperture of the workpiece which continues the advancement of the sleeve.
Claim 8
Dependent Claim
74 words
In a motor driven power tool as recited in claim 6, wherein a head is provided on the end of the shaft adjacent to the motor, a spring beneath the head, and a releasable connection between the motor and shaft head which is released at the end of the advancement of the shaft by the insert after the thread of the shaft is disengaged from those of the body to complete the insertion operation.
Claim 9
Dependent Claim
69 words
In a motor driven power tool as recited in claim 7, wherein the head contains a slot and wherein the motor has a finger extending into the slot, cam means on the driving and driven sidEs of the finger and head which moves the head further downwardly to cam the fingers from the slot after the slot moves down with the head at the end of the insertion operation.
Claim 10
Dependent Claim
53 words
In a motor driven power tool as recited in claim 8, wherein the reversal of the motor provides connection with the ends of the wall of the slot and the finger portions having no cam thereon which reverses the rotation of the shaft and screws the threaded end thereof out of the insert.
Claim 11
Dependent Claim
66 words
In a motor driven power tool as recited in claim 9, wherein the head is retracted by the spring to reconnect the threaded end of the shaft with the thread in the body and move the slot in the head over the finger which drives the shaft in reverse rotation to advance the body to its initial position for receiving the next insert to be installed.
Claim 12
Dependent Claim
57 words
In a motor driven power tool as recited in claim 1, wherein the thread of the collar is located relative to the thread of the threaded end of the shaft by the insert therebetween, and means for securing the collar in fixed relation to the end of the body while the insert is positioned between said threads.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |