Lee Valley Tools Woodworking Newsletter
Vol. 1, Issue 5
July 2007
Featured Patents

Patented Sept. 22, 1931
United States Patent Office
Peter L. Robertson, of Milton, Ontario, Canada
Screw Driver
Application filed January 10, 1929. Serial No. 331,516.

The principal objects of this invention are to provide a screw driver which may be readily adapted for use with various sizes or types of screws and which may be altered very quickly to suit the requirements of the user.

A further object is to improve the construction of the holder of the removable bits to enable their more ready adjustment and rearrangement.

The principal feature of the invention consists in the novel arrangement of a plurality of individual bits to be utilized in various combinations and in the novel construction of the bit holder whereby the bits are readily adjusted or replaced therein.

This invention is an improvement in screw drivers to be used principally in conjunction with my co-pending invention for improvements in tool holders, filed in the United States Patent Office July 2, 1928 under Serial No. 289,954.

In the accompanying drawings, Figure 1 is a perspective view of my improved screw driver showing the multiple bit arrangement for use with large slotted screws.

Figure 2 is a perspective view of the bit end of the screw driver showing the arrangement of the bits with a smaller screw.

Figure 3 is a perspective view of the bit end of the screw driver showing an arrangement of the bits for use with a perforated screw, such as a wheel spoke nipple.

Figure 4 is a perspective detail of the inner bit holder and bits.

Figure 5 is an enlarged longitudinal sectional detail through the bit holder showing the bits in position, as shown in Figure 1.


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