Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS933639 A
Publication typeGrant
Publication dateSep 7, 1909
Filing dateOct 27, 1908
Priority dateOct 27, 1908
Publication numberUS 933639 A, US 933639A, US-A-933639, US933639 A, US933639A
InventorsCharles R Frink
Original AssigneeCharles R Frink
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 933639 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




Specification of Letters Patent.

Patented Sept. '7, 1909.

Application filed October 27, 1908. Serial No. 459,716.

T 0 all whom it may concern:

Be it known that 1, CHARLES R. FRINK, a citizen of the United States, residing at Brattleboro, in the county of \Vindham and State of Vermont, have invented new and useful Improvements in Bit-Stocks, of which the following is a specification.

This invention relates to a bit stock and more particularly to an angular screw driver whereby screws can be inserted or removed conveniently in those localities where an ordinary solid shank screw driver is incapable of being used.

The invention has for one of its objects to improve and simplify the construction of devices of this character so as to be comparatively simple and inexpensive to manufacture, reliable and efficient in use, and easily operated.

The invention consists of the novel arrangement and combination. of parts hereinafter more fully described and set forth with particularity in the appended claim.

In the accompanying drawing, which illus trates one embodiment of the invention, Figure 1 is a side view of the bit stock showing the application thereof. Fig. 2 is a central longitudinal section thereof. Fig. 3 is a sectional view on line 33, Fig. 2. Fig. 4. is a similar view of a modified construction.

Similar reference characters are employed to designate corresponding part-s throughout the views.

Referring to the drawing, 1 designates the rotary handle of the bit stock which is rigidly secured to a rod or shaft 2 that turns in a stationary tubular member 3 that forms a grip. On one end of the member 3 is an L-shaped head 4 which is provided with a reversely-arranged L-shaped bracket 5 that cooperates with the head to form an approximately rectangular frame. The head has a bearing opening 6 through which the shaft 2 extends and on the projecting end of the shaft is a miter gear 7 which meshes with a miter gear 8 on a short blade-carrying shaft 9. The shaft 9, which is disposed at right angles to the shaft 2, has one end reduced to form a journal 10 that rotates in a bearing 11 in the longitudinal arm of a bracket 5, there being an annular shoulder 12 on the shaft 9 which serves to prevent lateral movement of the said shaft in one direction, while the gear 8 bears on the longitudinal arm or extension 13 of the head f to prevent longitudinal movement of the shaft 9 in the opposite direction. The bracket 5 is secured to the head in any suitable manner, as for instance, by fastening screws 14, which permit the bracket to be removed to take out the shaft 9. The arm 13 of the head is provided with an opening 15 that forms a bearing in which the screw driver blade 16 is disposed, the said blade being provided with a socket 17 into which the shaft 9 extends and the blade and shaft are secured together by a screw 18 or other suitable means, the screw being prevented from working loose by reason of its location in the bearing opening 15.

Instead of making the shaft 9 and blade 16 separate, they can be forged or otherwise constructed in one piece, as shown in Fig. 4:. The inner end of the blade constitutes an annular shoulder against which the miter gear 8 bears and this gear and also the gear 7 are secured rigidly to the shafts 9 and 2, respectively.

In practice, a screw to be driven or removed, is engaged by the blade 16 while one hand grips the screw driver by the member or shaft 3 to steady the screw driver. The other hand is used to impart motion to the blade 16 by turning the handle 11 clockwise or anti-clockwise for moving the screw. By turning the handle, the shaft 3 is rotated and the miter gears rotate the shaft 9 together with the blade 16, while the frame on the end of the tubular member 3 is held stationary by the latter, which is gripped in one hand. It will thus be seen that the tool is easily and conveniently operated and is of substantial and durable construction.

Having thus described the invention, what I claim is In a bit stock of the class described, the combination of a tubular shank adapted to be gripped in one hand, a rod extending through the shank and rotatable therein, a handle rigidly secured to one extremity of the rod, a head on the tubular member and provided with a plate portion extending parallel with the axis of the said member, an L-shaped bracket having a plate portion disposed parallel with the plate portion of the head, fastenings for detachably securing the bracket to the head, bearings in the said plate portions arranged in line with each other in a plane transverse to the length of the rod, one of the bearings being larger than the other, a' bit disposed in the larger bearing, a shaft extending transversely to the first-mentioned shaft and having one end disposed in the smaller bearing, miter gear wheels arranged on the shafts and meshing with each other, said bit having a socket for receiving one end of the second-mentioned shaft, and a fastening for securing the bit on the second-mentioned shaft.

In testimony whereof I affix my signature in presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2696859 *Dec 16, 1950Dec 14, 1954Somma Gildo JScrew driver attachment
US5391170 *Oct 2, 1992Feb 21, 1995David A. McGuireAngled surgical screw driver and methods of arthroscopic ligament reconstruction
US5464407 *Nov 16, 1994Nov 7, 1995Mcguire; David A.Flexible surgical screwdriver and methods of arthroscopic ligament reconstruction
US5720542 *Jan 22, 1997Feb 24, 1998Birge, Jr.; William F.Tool system for reaching a confined location
Cooperative ClassificationB25B17/00