US3867988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power tools
Assignee: Porter Cable Corp
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Filing: 1973-02-02
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Granted: 1975-02-25
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Expires: 1993-02-02
Abstract
Abstract Power driven devices in which a tool is axially impacted by a driver mounted in a reciprocably driven piston. The tool can be intermittently rotated or not, as desired.
Inventors
- 👤 Heinrich P Koehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:31
CPC Classifications
E; E21; E21B; E21B6/00; E21B6/06; B; B25; B25D; B25D11/00; B25D11/06; B25D16/00; B25D16/006; B25F; B25F5/00; B25F5/001; B25D2211/00; B25D2211/06; B25D2211/062; B25D2211/064
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
217 words
A power driven device, comprising: a casing; a tool holder rotatably mounted in said casing; means which can be cycled through impacting and return strokes for imparting axial impacts to a tool mounted in said tool holder; means including a driving member and a driven member having means providing a drive connection therebetween for so connecting said impact imparting mechanism to said tool holder that said mechanism rotatably indexes said tool holder and the tool mounted therein during one of the strokes in each cycle thereof but does not effect rotation of the tool holder in the other of said strokes; and means selectively operable to effect a relative displacement between said driving and driven members which will interrupt the drive connection therebetween so that said tool can be axially impacted without rotating it, the last-mentioned means including a shaft rotatable in said casing about an axis normal to the path of relative movement between the driving member and the driven member, cam means extending from said shaft which is engageable with one of said driving and driven members, and an actuator located externally of the casing and rotatable with said shaft for turning said shaft and causing the cam means to displace the member engageable thereby relative to the other of said driving and driven members.
Claim 2
Dependent Claim
217 words
A power driven device, comprising: a casing; a tool holder rotatably mounted in said casing; means which can be cycled through impacting and return strokes for imparting axial impacts to a tool mounted in said tool holder; means including a driving member and a driven member having means providing a drive connection therebetween for so connecting said impact imparting mechanism to said tool holder that said mechanism rotatably indexes said tool holder and the tool mounted therein during one of the strokes in each cycle thereof but does not effect rotation of the tool holder in the other of said strokes; and means selectively operable to effect a relative displacement between said driving and driven members which will interrupt the drive connection therebetween so that said tool can be axially impacted without rotating it, the last-mentioned means including a shaft rotatable in said casing about an axis normal to the path of relative movement between the driving member and the driven member, cam means extending from said shaft which is engageable with one of said driving and driven members, and an actuator located externally of the casing and rotatable with said shaft for turning said shaft and causing the cam means to displace the member engageable thereby relative to the other of said driving and driven members.
Claim 3
Dependent Claim
83 words
The power driven device of claim 1, wherein said tool holder is integral with said driven member, wherein said driven member is fixed against axial movement relative to said casing, wherein the means for connecting the impact imparting mechanism to said tool holder includes means biasing said driving member toward said driven member to complete the drive connection therebetween, and wherein said cam is arranged to move said driving member away from said driven member against the force exerted by said biasing means.
Claim 4
Dependent Claim
93 words
The power driven device of claim 1, wherein the means for drive connecting the impact imparting mechanism to the tool holder includes a frictional indexing connection providing means capable of transmitting only forces up to a selected maximum magnitude operatively connected between said impact imparting mechanism and the driving member, whereby the drive connection between the impact imparting mechanism and the tool holder is effectivley interrupted while there is a rotation restraining force on said tool holder which exceeds the magnitude of the force which said frictional drive connection is capable of transmitting.
Claim 5
Dependent Claim
95 words
The power driven device of claim 1, wherein the means for drive connecting the impact imparting mechanism to the tool holder includes a ratchet means having said driving member as an input and said driven member as an output and means for rotating said driving member back and forth as said impact imparting mechanism moves through its impacting and return strokes, there being cooperating first and second means on said driving And driven members engageable when said driving member is rotated in one direction only to rotatably advance said driven member and said tool holder.
Claim 6
Dependent Claim
47 words
The power driven device of claim 1, wherein said impact imparting mechanism includes a cylindrical piston and a driver slidable in said piston and extendible therefrom into impacting relationship with a tool socketed in said tool holder as the impact imparting mechanism moves through its impacting stroke.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |