US3905429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery powered hand tool
Assignee: Individual
•
Filing: 1974-06-10
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Granted: 1975-09-16
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Expires: 1994-06-10
Abstract
Abstract A battery powered hand tool having a rotary output shaft with a worm gear drive, which provides a large reduction ratio in a single stage and prevents mechanical feedback load to the motor. The tool is self-contained with the batteries enclosed in a hand grip portion and an actuating and reversing switch conveniently positioned for the operator. The output shaft is adaptable to a wide range of screwdriver, socket and similar rotary tool elements, and the housing for the tool may be a compact pistol type or an elongated wrench type configuration.
Inventors
- 👤 Alfred H Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
B; B25; B25B; B25B21/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A battery powered hand tool, comprising: an elongated housing for containing a battery pack therein; said housing having an extension at one end; a worm gear drive unit mounted in said extension and having an output shaft projecting substantially perpendicular to said housing, with means on the output shaft for attachment thereto of accessory tool bits; a platform in said extension on which said drive unit is mounted, the platform having a wall portion extending into and secured to said housing; a bracket fixed on said platform, said output shaft being journalled in said bracket and having bearing means holding the output shaft against axial movement in the bracket; said drive unit including a worm gear fixed on said output shaft, and a worm mounted in said bracket in mesh with the worm gear; a drive motor mounted on said platform and having a drive shaft on which said worm is fixed; said bracket having arms in which said drive shaft is journalled and between which said worm is held against axial movement; and a motor actuating switch mounted in said housing.
Claim 2
Dependent Claim
182 words
A battery powered hand tool, comprising: an elongated housing for containing a battery pack therein; said housing having an extension at one end; a worm gear drive unit mounted in said extension and having an output shaft projecting substantially perpendicular to said housing, with means on the output shaft for attachment thereto of accessory tool bits; a platform in said extension on which said drive unit is mounted, the platform having a wall portion extending into and secured to said housing; a bracket fixed on said platform, said output shaft being journalled in said bracket and having bearing means holding the output shaft against axial movement in the bracket; said drive unit including a worm gear fixed on said output shaft, and a worm mounted in said bracket in mesh with the worm gear; a drive motor mounted on said platform and having a drive shaft on which said worm is fixed; said bracket having arms in which said drive shaft is journalled and between which said worm is held against axial movement; and a motor actuating switch mounted in said housing.
Claim 3
Dependent Claim
33 words
A battery powered Hand tool according to claim 1, said bracket having extended plate portions in which said output shaft is journalled; and side webs interconnecting said plate portions in a rigid structure.
Claim 4
Dependent Claim
46 words
A battery powered hand tool according to claim 2, wherein said plate portions include a front plate adjacent the projecting portion of said output shaft, a back plate and an intermediate plate, said worm gear being held against axial movement between said back and intermediate plates.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |