US3806973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tap driver
Assignee: Valenite LLC
•
Filing: 1972-05-25
•
Granted: 1974-04-30
•
Expires: 1992-05-25
Abstract
Abstract The invention comprises an improved axially compensating tap driver having a recirculating anti-friction bearing engagement between axially telescoping portions. The bearing race comprises an elongated endless race directly machined in the cylindrical surface of the male portion and a longitudinal channel directly machined in the concentric cylindrical female portion with antifriction bearings interengaging the adjacent opposed longitudinal race surfaces. The telescoping portions are retained together for controlled axial movement and recovery therebetween by elastic means. The bottom of the channel preferably engages the male member thereby providing a substantially full radial support engagement of simple geometry and exceptionally economic manufacture.
Inventors
- 👤 D Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/08; B23B31/083
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
201 words
A tap driver, comprising; a driving member, a dRiven member axially aligned and formed with concentric cylindrical guide surfaces for telescoping engagement therewith, elastic means provided between said members adapted to permit controlled relative axial movement therebetween, said telescoping engagement including axially extending longitudinal channel means formed in one of said driving and driven members, an endless race formed in the other of said members having parallel longitudinal race paths adapted to register with said channel means, and re-circulating bearing means located in said race with a portion of said bearing means adapted for driving engagement with one side of said channel, said race and channel means being respectively formed entirely by eliminating stock radially outside of the cylindrical guide surface of the external member and radially within the cylindrical guide surface of the internal member, said registering race paths and channel means forming composite bearing races having substantially parallel bearing walls extending substantially normal to the plane of said endless race, and terminating at said guide surfaces, said race paths having an angular separation in the order of one quadrant sufficient to provide adequate directly opposed bearing walls within the confines of said cylindrical guide surface of the internal member.
Claim 2
Dependent Claim
201 words
A tap driver, comprising; a driving member, a dRiven member axially aligned and formed with concentric cylindrical guide surfaces for telescoping engagement therewith, elastic means provided between said members adapted to permit controlled relative axial movement therebetween, said telescoping engagement including axially extending longitudinal channel means formed in one of said driving and driven members, an endless race formed in the other of said members having parallel longitudinal race paths adapted to register with said channel means, and re-circulating bearing means located in said race with a portion of said bearing means adapted for driving engagement with one side of said channel, said race and channel means being respectively formed entirely by eliminating stock radially outside of the cylindrical guide surface of the external member and radially within the cylindrical guide surface of the internal member, said registering race paths and channel means forming composite bearing races having substantially parallel bearing walls extending substantially normal to the plane of said endless race, and terminating at said guide surfaces, said race paths having an angular separation in the order of one quadrant sufficient to provide adequate directly opposed bearing walls within the confines of said cylindrical guide surface of the internal member.
Claim 3
Dependent Claim
12 words
The tap driver of claim 1 wherein said endless race is elongated.
Claim 4
Dependent Claim
20 words
The tap driver of claim 2 wherein the bottom of said channel means is tangential to said cylindrical guide surfaces.
Claim 5
Dependent Claim
14 words
The tap driver of claim 2 wherein the sides of said channel are parallel.
Claim 6
Dependent Claim
15 words
The tap driver of claim 2 wherein the axes of said bearing means are parallel.
Claim 7
Dependent Claim
23 words
The tap driver of claim 2 wherein a portion of the bottom of said channel means extends to the associated cylindrical guide surface.
Claim 8
Dependent Claim
13 words
The tap driver of claim 2 wherein said elastic means comprises spring means.
Claim 9
Dependent Claim
54 words
The tap driver of claim 7 wherein said driven member includes a shaft axially extending within said spring means and having a shoulder in engagement therewith, and wherein a bore hole in said driving member is located concentrically about said spring means and includes a second shoulder in opposed engagement with said spring means.
Claim 10
Dependent Claim
53 words
The tap driver of claim 7 wherein said driving member includes a shaft axially extending within said spring means and having a shoulder in engagement therewith, and wherein a bore hole in said driven member is located concentrically about said spring means and includes a shoulder in opposed engagement with said spring means.
Claim 11
Dependent Claim
17 words
The tap driver of claim 7 wherein said spring means comprise dual springs having unequal spring rates.
Claim 12
Dependent Claim
15 words
The tap driver of claim 2 wherein said bearing means include a plurality of rollers.
Claim 13
Dependent Claim
15 words
The tap driver of claim 2 wherein said bearing means include a plurality of balls.
Claim 14
Dependent Claim
37 words
The tap driver of claim 1 wherein said driving member includes connection means and a separable shank adapted for replacement by any one of a variety of shanks suited for use in a variety of machine spindles.
Claim 15
Dependent Claim
32 words
The tap driver of claim 6 wherein said portion of the bottom of said race extending to the guide surface lies straight and parallel to the common axis of said telescoping members.
Claim 16
Dependent Claim
199 words
A telescopically extensible rotary drive shaft comprising; an outer member having a longitudinal right circular cylindrical opening therein, a cylindrical inner member concentric with said outer member and formed for guided telescoping engagement within said longitudinal opening, axially extending longitudinal channel means formed in the inner surface of said longitudinal opening, an endless race formed in the outer surface of said inner member, having parallel longitudinal race paths adapted to register with said channel means; and, recirculating bearing means located in said race with a portion of said bearing means adapted for driving engagement with one side of said channel, said race and channel means being respectively formed entirely By eliminating stock radially outside of the cylindrical guide surface of the external member and radially within the cylindrical guide surface of the internal member, said registering race paths and channel means forming composite bearing races having substantially parallel bearing walls extending substantially normal to the plane of said endless race, and terminating at said guide surfaces, said race paths having an angular separation in the order of one quadrant sufficient to provide adequate directly opposed bearing walls within the confines of said cylindrical guide surface of the internal member.
Claim 17
Dependent Claim
199 words
A telescopically extensible rotary drive shaft comprising; an outer member having a longitudinal right circular cylindrical opening therein, a cylindrical inner member concentric with said outer member and formed for guided telescoping engagement within said longitudinal opening, axially extending longitudinal channel means formed in the inner surface of said longitudinal opening, an endless race formed in the outer surface of said inner member, having parallel longitudinal race paths adapted to register with said channel means; and, recirculating bearing means located in said race with a portion of said bearing means adapted for driving engagement with one side of said channel, said race and channel means being respectively formed entirely By eliminating stock radially outside of the cylindrical guide surface of the external member and radially within the cylindrical guide surface of the internal member, said registering race paths and channel means forming composite bearing races having substantially parallel bearing walls extending substantially normal to the plane of said endless race, and terminating at said guide surfaces, said race paths having an angular separation in the order of one quadrant sufficient to provide adequate directly opposed bearing walls within the confines of said cylindrical guide surface of the internal member.
Claim 18
Dependent Claim
26 words
The telescopically extensible rotary drive shaft of claim 15 wherein the bottom of said channel means is tangential to said outer surface of said inner member.
Claim 19
Dependent Claim
27 words
The telescopically extensible rotary drive shaft of claim 15 wherein a portion of the bottom of said race extends to the outer surface of said inner member.
Claim 20
Dependent Claim
31 words
The telescopically extensible rotary drive shaft of claim 17 wherein said portion of the bottom of said race is straight and parallel to the common axis of said guided telescoping members.
Claim 21
Dependent Claim
28 words
The tap driver of claim 1 wherein only a single endless race is employed and the guide surfaces opposite said race extend substantially around the remaining three quadrants.
Claim 22
Dependent Claim
17 words
The tap driver of claim 1 wherein said composite bearing races are substantially rectangular in cross section.
References Cited (Backward Citations)
US1918108A
Cited
US2371330A
Cited
US2772094A
Cited
US2979147A
Cited
US2981570A
Cited
US3113329A
Cited
US3143867A
Cited
US3178739A
Cited
US3220030A
Cited
US3552806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |