US3797497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill like driving device
Assignee: Stryker Corp
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Filing: 1972-02-28
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Granted: 1974-03-19
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Expires: 1992-02-28
Abstract
Abstract A driving device including a right-angle handpiece assembly having a casing containing an input shaft, an output shaft and means drivingly connecting same. A bone drill attachment is connectible to the handpiece assembly and includes a cylindrical extension mountable upon the output end of the casing and concentric inner and outer drill bits which project from said extension. The inner drill bit is connectible to the output shaft by a pair of clutch mechanisms which are normally spring-biased into a disconnected position. The outer drill bit normally rotates with the inner drill bit but is permitted to move axially and angularly relative to the inner drill bit through a predetermined distance. The cutting end of the inner drill bit extends axially beyond the cutting end of the outer drill bit. Alternately, a wire driving attachment can be connected to the handpiece assembly and includes a chuck structure mountable upon the output end of the casing and drivingly connectible to the output shaft. The chuck structure has a continuous opening therethrough which aligns with a through opening in the casing for receiving therein an elongated member, such as a wire.
Inventors
- 👤 P Crim
- 👤 W Warfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:03
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/02; B23Q5/04; B23Q5/043; B23Q5/045; A; A61; A61B; A61B17/00; A61B17/16; A61B17/1613; A61B17/1615; A61B17/1617; A61B17/1633; A61B17/1697; A61B2017/00535; A61B2017/00544; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19074; Y10T74/19112
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
236 words
In a drill assembly having casing means, input shaft means rotatably supported within said casing means, and output shaft means rotatably supported within said casing means and connected to said input shaft means for rotation thereby, the combination comprising: a tubular, cylindrical extension on said casing means coaxial with said output shaft means; outer cylindrical bit means having a coaxial cylindrical opening extending therethrough, said outer bit means being rotatably supported relative to said extension; inner bit means snugly but slidably disposed within said outer bit means, said inner bit means having a workpiece engaging end extending axially beyond the corresponding end of said outer bit means; cooperating stop means on said inner and outer bit means permitting limited relative axial movement therebetween; engageable clutch means coacting between said inner bit means and said output shaft means and adapted, when engaged, to rotate said inner and outer bit means in response to rotation of said output shaft means; and said clutch means including first and second disengageable clutch devices drivingly connected in series and each including resilient means normally maintaining same in a released condition, whereby engagement of both of said clutch Devices is necessary to permit said inner and outer bit means to be rotated in response to rotation of said output shaft means, engagement of said clutch devices being effected when said end of said inner bit means is pressed firmly against a workpiece.
Claim 2
Dependent Claim
236 words
In a drill assembly having casing means, input shaft means rotatably supported within said casing means, and output shaft means rotatably supported within said casing means and connected to said input shaft means for rotation thereby, the combination comprising: a tubular, cylindrical extension on said casing means coaxial with said output shaft means; outer cylindrical bit means having a coaxial cylindrical opening extending therethrough, said outer bit means being rotatably supported relative to said extension; inner bit means snugly but slidably disposed within said outer bit means, said inner bit means having a workpiece engaging end extending axially beyond the corresponding end of said outer bit means; cooperating stop means on said inner and outer bit means permitting limited relative axial movement therebetween; engageable clutch means coacting between said inner bit means and said output shaft means and adapted, when engaged, to rotate said inner and outer bit means in response to rotation of said output shaft means; and said clutch means including first and second disengageable clutch devices drivingly connected in series and each including resilient means normally maintaining same in a released condition, whereby engagement of both of said clutch Devices is necessary to permit said inner and outer bit means to be rotated in response to rotation of said output shaft means, engagement of said clutch devices being effected when said end of said inner bit means is pressed firmly against a workpiece.
Claim 3
Dependent Claim
51 words
A drill assembly according to claim 1, wherein said casing means includes first and second tubular portions fixedly connected together at right angles to one another, and wherein said input and output shaft means are respectively rotatably supported within said first and second tubular portions and are interconnected by gear means.
Claim 4
Dependent Claim
114 words
A drill assembly according to claim 1, wherein said stop means comprises an elongated helical slot in one of said bit means and a pin rigidly secured to and extending radially from the other of said bit means into said slot for permitting only limited axial and rotational movement between said inner and outer bit means, said helical slot being oriented in a direction relative to the rotational direction of said inner bit means for causing said inner bit means to be moved axially for causing disengagement of said clutch means when the external load on said inner bit means is removed but an external load is still present on said outer bit means.
Claim 5
Dependent Claim
204 words
A drill assembly according to claim 1, wherein at least one of said clutch devices includes a first annular sleeve member rotatably supported within said cylindrical extension, said first sleeve member having an ejector pin slidably supported thereon for axial movement thereof in a direction substantially parallel with the longitudinal direction of said cylindrical extension, and said resilient means associated with said one clutch device comprising spring means coacting between said first sleeve member and said pin for normally urging said pin outwardly from one end of said first sleeve member, said one end of said sleeve member also having projection means extending axially outwardly thereof; and said one clutch device also including a second sleeve member rotatably supported within said cylindrical extension and spaced axially of said first sleeve member, said second sleeve member having rib means formed thereon which extends both axially and radially thereof, said rib means extending axially in a direction toward said one end of said first sleeve member, whereby relative axial movement of said first and second sleeve members toward one another in opposition to the urging of said spring means causes said projection means to axially overlap said rib means for providing a torque transmitting connection therebetween.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |