US3655244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact driven tool with replaceable cutting point
Assignee: INT TOOL SALES
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Filing: 1970-07-30
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Granted: 1972-04-11
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Expires: 1990-07-30
Abstract
Abstract The shaft and replaceable cutting point of an impact driven tool utilize half an ellipse as the outline of both the external cross-sectional configuration of the driving end of the shaft and the internal cross-sectional configuration of the recess in the tip. The tip is frictionally retained on the shaft driving end for effecting a driving connection therewith.
Inventors
- 👤 James A Swisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:54
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/02; F; F16; F16B; F16B2200/00; F16B2200/10; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17957; Y10T279/17965
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
An impact driven tool comprising an elongated shaft having a driving end with a single substantially continuously curved conical surface formed by revolving a curve, and a cutting point having a recess with a single substantially continuously curved conical surface formed by revolving a curve concentrically frictionally interengaging the shaft end surface such as to provide total mating of said surfaces relative to each other and to effect a positive driving connection between said shaft and said cutting point.
Claim 2
Dependent Claim
79 words
An impact driven tool comprising an elongated shaft having a driving end with a single substantially continuously curved conical surface formed by revolving a curve, and a cutting point having a recess with a single substantially continuously curved conical surface formed by revolving a curve concentrically frictionally interengaging the shaft end surface such as to provide total mating of said surfaces relative to each other and to effect a positive driving connection between said shaft and said cutting point.
Claim 3
Dependent Claim
39 words
The tool as define in claim 1, wherein said driving end has a substantially semi-elliptical external cross-sectional configuration and wherein said recess has a substantially semi-elliptical internal cross-sectional configuration substantially corresponding to said external configuration of said driving end.
Claim 4
Dependent Claim
25 words
The tool as defined in claim 1, wherein said surfaces of said recess and said driving end include base portions and vertexes interengaging each other.
Claim 5
Dependent Claim
80 words
The tool as defined in claim 1, wherein said cutting point includes a wall area surrounding said driving end, said wall area including a relatively thin-walled portion impactively slightly stretched by said driving end for effecting radial compressive forces that frictionally retain said cutting point on said driving end, and including a relatively thick-walled pOrtion cooperating with an adjacent portion of said driving end for the transmission of percussive forces from such adjacent drive end portion to said thick-walled portion.
Claim 6
Dependent Claim
42 words
The tool as defined in claim 4, wherein said thick-walled portion of said wall area includes the innermost end portion of said recess, and wherein said adjacent drive end portion includes the apex of said driving end abutting said innermost end portion.
Claim 7
Dependent Claim
40 words
The tool as defined in claim 1, wherein said cutting point includes an outer peripheral surface having a base portion at one end and terminating into an apex at the opposite end, and said apex constituting a blade-shaped cutting edge.
Claim 8
Dependent Claim
27 words
The tool as defined in claim 1, wherein said cutting point includes a hardened point area and a relatively less hardened wall area surrounding said driving end.
Claim 9
Dependent Claim
62 words
The tool as defined in claim 1, wherein said shaft includes an extended hexagonal portion adjacent said driving end, said extended portion having a core diameter larger than the largest diameter of said driving end, and wherein said shaft further includes a gradual upset portion intermediate said extended portion and said driving end to ease the abrupt transition between such varying diameters.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |