US3629784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric swivel connection
Assignee: Individual
•
Filing: 1969-12-19
•
Granted: 1971-12-21
•
Expires: 1989-12-19
Abstract
Abstract The electrical swivel Connection is housed in a recess in a power tool handle and has a relatively fixed section of insulating material fitting the inner end of said recess, and has an axially disposed reduced cylindrical outer end, and has an axially disposed bore extending inwardly from the outer end thereof. The rotatable section of insulating material has a larger inner end within the recess of the tool handle, and has an outer cylindrical end of reduced diameter projecting beyond the outer end of the recess. The rotatable section has a cylindrical recess in its inner end receiving the reduced cylindrical outer end of the fixed section. A first ball bearing has its inner race fixedly secured to the cylindrical outer end of the fixed section, and has its outer race fixedly secured to the inner end of the rotatable section. An electrical contact is disposed at the center of the recess in the rotatable section and a second contact is disposed at the inner end of the bore in the fixed section. A spring-biased plug in the bore establishes an electrical circuit between said contacts. A power conductor extends from the second contact through the fixed section into the handle. A second power conductor extends from the inner race through the fixed section into the handle. A second ball bearing has its inner race removably mounted on the outer cylindrical end of the rotatable section, and has its outer race engaging the wall of the recess in the handle and grounded thereto. A washer closes the outer end of the recess beyond the second ball bearing. An electric cable having three leads is connected to the outer end of the rotatable section, one lead being connected through the rotatable section with the inner race of the second ball bearing, another lead being connected through the rotatable section to the first contact of that section, and the third lead being connected through the rotatable section with the outer race of the first ball bearing.
Inventors
- 👤 James M Bjorn
- 👤 Frederick Marx Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:27
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/64; H01R39/643
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
310 words
In combination with a power tool handle having a cylindrical recess therein, an electrical swivel connection comprising a fixed section of insulating material at the inner end of said recess, and having an axially disposed reduced cylindrical outer end, and having an axially disposed bore extending inwardly from said outer end; a rotatable section of insulating material having a larger inner end disposed within the recess and having a reduced outer cylindrical end projecting beyond the recess; said rotatable section having a cylindrical recess in its inner end receiving the outer end of the fixed section; a first ball bearing having its inner race fixedly secured to the said cylindrical outer end of the fixed section, and having its outer race fixedly secured within the recess of the rotatable section; and electrical contact in the recess in the rotatable section; a second contact in the bore in the fixed section; a spring-biased contact plug in the said bore electrically connecting said contacts; a power conductor extending from the second contact through the fixed section into the handle; a second power conductor extending from the inner race through the fixed section into the handle; a second ball bearing having its inner race removable mounted on the outer cylindrical end of the rotatable section, and having its outer race engaging the wall of the recess in the handle and grounded thereto; means for closing the outer end of the recess beyond the second ball bearing; an electric cable connected to the outer end of the rotatable section having three leads, and one lead being connected through the rotatable section with the inner race of the second ball bearing, another lead being connected through the rotatable section of the first contact of said section, and the third lead being connected through the rotatable section with the outer race of the first ball bearing.
Claim 2
Dependent Claim
310 words
In combination with a power tool handle having a cylindrical recess therein, an electrical swivel connection comprising a fixed section of insulating material at the inner end of said recess, and having an axially disposed reduced cylindrical outer end, and having an axially disposed bore extending inwardly from said outer end; a rotatable section of insulating material having a larger inner end disposed within the recess and having a reduced outer cylindrical end projecting beyond the recess; said rotatable section having a cylindrical recess in its inner end receiving the outer end of the fixed section; a first ball bearing having its inner race fixedly secured to the said cylindrical outer end of the fixed section, and having its outer race fixedly secured within the recess of the rotatable section; and electrical contact in the recess in the rotatable section; a second contact in the bore in the fixed section; a spring-biased contact plug in the said bore electrically connecting said contacts; a power conductor extending from the second contact through the fixed section into the handle; a second power conductor extending from the inner race through the fixed section into the handle; a second ball bearing having its inner race removable mounted on the outer cylindrical end of the rotatable section, and having its outer race engaging the wall of the recess in the handle and grounded thereto; means for closing the outer end of the recess beyond the second ball bearing; an electric cable connected to the outer end of the rotatable section having three leads, and one lead being connected through the rotatable section with the inner race of the second ball bearing, another lead being connected through the rotatable section of the first contact of said section, and the third lead being connected through the rotatable section with the outer race of the first ball bearing.
Claim 3
Dependent Claim
51 words
In a combination as set forth in claim 1, an outer edge of the reduced cylindrical outer end of the fixed section having a lip adapted to be flattened over an outer face of the inner race of the first ball bearing to lock the said race to the fixed section.
Claim 4
Dependent Claim
43 words
In combination as set forth in claim 1, an inner edge of the rotatable section having an internal lip adapted to snap-fit over an inner face of the outer race of the first ball bearing to lock the rotatable section to said race.
Claim 5
Dependent Claim
43 words
In a combination as set forth in claim 1, said spring-biased contact plug urging the sections to separate axially thereby maintaining the balls within the races of the ball bearings in positive physical and electrical contact insuring continuity of the electrical circuits therethrough.
Claim 6
Dependent Claim
41 words
In a combination as set forth in claim 4, said ball bearings containing a relatively large number of balls respectively thereby dividing the electric current therethrough into a number of parallel circuits corresponding with the number of balls, to prevent arcing.
Claim 7
Dependent Claim
353 words
In combination with a power tool handle having a cylindrical recess therein, an electrical swivel connection comprising a relatively fixed section of insulating material snugly fitting the inner end of said recess, and having an axially disposed reduced cylindrical outer end, and having an axially disposed bore extending from said outer end terminating short of the inner end of said section; a rotatable section of insulating material having a larger inner end within the recess of less diameter than the recess and an outer cylindrical end of reduced diameter projecting beyond the outer end of the recess; said rotatable section having a cylindrical recess in its inner end receiving the cylindrical outer end of the fixed section; a first ball bearing having its inner race fixedly secured to the said cylindrical outer end of the fixed section, and having its outer race fixedly secured to the inner end of the rotatable section; an electrical contact at the center of the recess in the rotatable section; a second contact at the inner end of the bore in the fixed section; a spring-biased contact plug in the said bore establishing an electrical circuit between said contacts; a power conductor extending from the second contact through the fixed section into the handle; a second power conductor extending from the inner race through the fixed section into the handle; a second ball bearing having its inner race removably mounted on the outer cylindrical end of the rotatable section, and having its outer race engaging the wall of the recess in the handle and grounded thereto; a washer closing the outer end of the recess beyond the second ball bearing; a split ring in the recess maintaining the washer in position; an electric cable connected to the outer end of the rotatable section and having three leads, one lead being connected through the rotatable section with the inner race of the second ball bearing, another lead being connected through the rotatable section to the first contact of said section, and the third lead being connected through the rotatable section with the outer race of the first ball bearing.
Claim 8
Dependent Claim
353 words
In combination with a power tool handle having a cylindrical recess therein, an electrical swivel connection comprising a relatively fixed section of insulating material snugly fitting the inner end of said recess, and having an axially disposed reduced cylindrical outer end, and having an axially disposed bore extending from said outer end terminating short of the inner end of said section; a rotatable section of insulating material having a larger inner end within the recess of less diameter than the recess and an outer cylindrical end of reduced diameter projecting beyond the outer end of the recess; said rotatable section having a cylindrical recess in its inner end receiving the cylindrical outer end of the fixed section; a first ball bearing having its inner race fixedly secured to the said cylindrical outer end of the fixed section, and having its outer race fixedly secured to the inner end of the rotatable section; an electrical contact at the center of the recess in the rotatable section; a second contact at the inner end of the bore in the fixed section; a spring-biased contact plug in the said bore establishing an electrical circuit between said contacts; a power conductor extending from the second contact through the fixed section into the handle; a second power conductor extending from the inner race through the fixed section into the handle; a second ball bearing having its inner race removably mounted on the outer cylindrical end of the rotatable section, and having its outer race engaging the wall of the recess in the handle and grounded thereto; a washer closing the outer end of the recess beyond the second ball bearing; a split ring in the recess maintaining the washer in position; an electric cable connected to the outer end of the rotatable section and having three leads, one lead being connected through the rotatable section with the inner race of the second ball bearing, another lead being connected through the rotatable section to the first contact of said section, and the third lead being connected through the rotatable section with the outer race of the first ball bearing.
Claim 9
Dependent Claim
51 words
In a combination as set forth in claim 6, an outer edge of the reduced cylindrical outer end of the fixed section having a lip adapted to be flattened over an outer face of the inner race of the first ball bearing to lock the said race to the fixed section.
Claim 10
Dependent Claim
44 words
In a combination as set forth in claim 6, an inner edge of the rotatable section having an internal lip adapted To snap-fit over an inner face of the outer race of the first ball bearing to lock the rotatable section to said race.
Claim 11
Dependent Claim
43 words
In a combination as set forth in claim 6, said spring-biased contact plug urging the sections to separate axially thereby maintaining the balls within the races of the ball bearings in positive physical and electrical contact insuring continuity of the electrical circuits therethrough.
Claim 12
Dependent Claim
41 words
In a combination as set forth in claim 9, said ball bearings containing a relatively large number of balls respectively thereby dividing the electric current therethrough into a number of parallel circuits corresponding with the number of balls, to prevent arcing.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |