US3762200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tools for fixing tubular fasteners in position
Assignee: PSM International PLC
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Filing: 1971-10-08
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Granted: 1973-10-02
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Expires: 1991-10-08
Abstract
Abstract The disclosure provides a tool for crimping tubular internally screw-threaded fasteners by axially collapsing the fasteners to create a bulge, in which a screw carried by the tool is engaged with the fastener and is then held stationary and axially displaced, the screw being unscrewed from the fastener at the conclusion of the displacement, and these operations being effected by including a lost-motion device in the drive to the screw. The lost-motion device disclosed includes a pair of discs trapping a drive ball between them so that rotation of one disc rolls the ball around a cam track between the discs and separates the discs to provide the axial displacement, drive being resumed when the ball reaches the ends of the tracks.
Inventors
- 👤 L Still
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:24
CPC Classifications
B; B25; B25B; B25B27/00; B25B27/0007; B25B27/0014
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
239 words
A tool for axially collapsing tubular, internally threaded fasteners having a flange at one end, to trap an apertured sheet between the flange and a bulge created in the fastener by collapse thereof, said tool comprising a body portion in which is slidably and rotatably mounted a holder for a screw-threaded bit engageable with the fastener, wherein the improvement comprises a drive train for transmitting rotational movement to the holder from a power source, said drive train comprising an input portion adapted to be connected to the power source and an output portion fixed to the bit holder, which have a lost motion connection with one another, and which have cooperating inclined cam surfaces that cause relative axial movement of the input and output portions to extend the bit holder during lost motion at the start of rotational movement of the input portion in a first direction, and cause relative axial movement of the input and output portions to retract the bit holder during lost motion at the start of rotational movement of the input portion in the other direction, whereby the input portion of thE drive train may be driven in the first direction to screw the bit into a fastener until the body portion can be held against the work, and may then be driven in the other direction to retract the bit and thus axially collapse the fastener and then unscrew the bit from the fastener.
Claim 2
Dependent Claim
239 words
A tool for axially collapsing tubular, internally threaded fasteners having a flange at one end, to trap an apertured sheet between the flange and a bulge created in the fastener by collapse thereof, said tool comprising a body portion in which is slidably and rotatably mounted a holder for a screw-threaded bit engageable with the fastener, wherein the improvement comprises a drive train for transmitting rotational movement to the holder from a power source, said drive train comprising an input portion adapted to be connected to the power source and an output portion fixed to the bit holder, which have a lost motion connection with one another, and which have cooperating inclined cam surfaces that cause relative axial movement of the input and output portions to extend the bit holder during lost motion at the start of rotational movement of the input portion in a first direction, and cause relative axial movement of the input and output portions to retract the bit holder during lost motion at the start of rotational movement of the input portion in the other direction, whereby the input portion of thE drive train may be driven in the first direction to screw the bit into a fastener until the body portion can be held against the work, and may then be driven in the other direction to retract the bit and thus axially collapse the fastener and then unscrew the bit from the fastener.
Claim 3
Dependent Claim
59 words
A tool according to claim 1 comprising two opposed cam plates, each carried by one of the two portions of the drive train, having a cam track between them, and a ball in the cam track which spaces the plates and which rides in the cam track to provide lost motion and to change the spacing between the plates.
Claim 4
Dependent Claim
27 words
A tool according to claim 2 wherein the cam track is defined by arcuate grooves formed one in each of the adjacent faces of the cam plates.
Claim 5
Dependent Claim
26 words
A tool according to claim 3 wherein the grooves are of reducing depth from one end towards the other and extend circumferentially around the respective plates.
Claim 6
Dependent Claim
15 words
A tool according to claim 2 comprising spring means urging the plates towards one another.
Claim 7
Dependent Claim
29 words
A tool according to claim 2 comprising means for resisting rotation of the output portion during rotation of the input portion of the drive train in said other direction.
Claim 8
Dependent Claim
18 words
A tool according to claim 6 comprising spring means for biasing the bit holder in the extended direction.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |