US Patent: 887,423
|
| Automatic screw-driver
|
|
Patentee:
|
|
| William M. Pratt (exact or similar names) - Greenfield, MA |
|
|
Patent Dates:
|
| Applied: |
Nov. 07, 1906 |
| Granted: |
May 12, 1908 |
|
Patent Pictures:
[
1 | 2
]
|
|
|
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Steve Gosselin
"Vintage Machinery" entry for Goodell-Pratt Co.
|
|
Description: |
| "My invention relates to spiral ratchet screw drivers and its object is to provide such a tool which is compact and simple in construction, pleasing in appearance and highly efficient in use... The invention particularly appertains to the type of spiral ratchet screw driver which includes a spiral spindle, a barrel fitted to the tool handle in which the spindle is axially guided, a pair of ratchet wheels housed within the barrel having keys engaging the spiral grooves of the spindle, pawls carried by the barrel and co-acting with the ratchet wheels and means for shifting the pawls to disengage the same from their respective ratchet wheels." |
|
){kind=link}
%20Martin%20J.%20Donnelly%20Antique%20Tools,%20https:%5Cx2f%5Cx2fwww.mjdtools.com%5Cx2f')){kind=link}