US737179A - Screw-driver. - Google Patents

Description

PATENTEDYAIUG'. 25, 1903.

' five/72.47)".

W SH WARD SCREW DRIVER.

APPLICATION nmn APR. 1a. 1003,

N0. 737,179. I0 uo nnL.

* UNITED STAT-Es;

WILLIAM s. WARD, or PLANTSVILLE,OQNNECTIOUT, ASSIGNOR TO H. n.-

' Patented August 25, 1961 PAT T- OFFICE.

SMITH AND" COMPANY, PLANTSVILLE, CONNECTICUT.

.- SCREW-DRIVER.

SPECIFICATION forming part of Letters Patent No. 737,179, dated August 25, 1903.

Application filed April 13,1903. serial No.152,323. (No man.)

To all whom it may concern: I 1

Be it known that 1, WILLIAM S. WARD, a

citizen of the United States,residing at Plantsville, in the county of Hartford and State of Connecticut, have invented certain new and; useful Improvements in Screw-Drivers, of which the following is a specification.

My invention relates to improvementsin screw-drivers; and the object of my inven-' tion is efficiency of the article.

In the accompanying drawings, Figure 1 is a side elevation of myscrew-driver. Fig. 2 is a longitudinal section on the line of Fig.

. 1, the rivets and part of the screw-driver being shown in elevation. Fig. '3 is a view showing the end face of the butt. Fig. 4 is a transverse section, partly in elevation, on the line Fig. 5 is a like view on the line Fig. 6 is a transverse section on Fig. '7 is a like view 112/, z 2, Fig. 1. the line 3 s of Fig. 1. on the line if t of Fig. 1. g he blade A gradually merges into the lower end of the round shank 8, while the up-; per end of the said round shank is joined by the conoidal bolster 9. In continuation-of the bolster'is the fiat handle-web 10, the upper end of which web is joined by the handlebutt 11, having a hammer-face 12 at its extreme upper end. The butt 11 joins the web on a curved line in side view with a slanting or beveled face 13, as shown, the base of the said face beiugindicated by the curved broken line at the upper part of Fig. 1. The junction of the handle-web and bolster forms a similar face 1 1 and presents a figure in side View that may be described as a V with the bottom rounded; The base of thisface is in like manner indicated in broken lines in Fig. 1. The blade, shank, bolster, handle-web, and butt are all formed'integral of one piece of dropforged metal.

On each side of the handle-web the handlescales 15, preferably of wood, are fitted, the ends of the said handle-scales being fitted to the faces 13 and 14. to assist in holding the said scales in place. The scales and handle-web are perforated for the reception of the rivets- 16, which rivets are provided with washers 17 at their ends. The butt is oval, and thehandle-scales are fiatted and rounded for the major part of their length, with a gradual decrease in the oval form toward the lower end, so as to present in end view and cross-section the various forms shown'in Figs. 3 to 7 at the points respectively opposite the said figures.

The hammer-face 12 will often be found Very convenient, the screw-driver as a whole being heavy enough and firm enough to make the said hammer-face effective. The screw"- driver'is very firm, substantial, and solid, while at the same timefit'is of a graceful and edective' form and particularly convenient to handle.

I deem the conoidal shape of the bolster and lower part of the handle, merging from an elliptical cross-section into the circular one of the blade-shank by a gentle taper without any shoulder or'abrupt break, as important, because it permits the operator while maintaining a firm grip upon the main portion of the handle to bring his finger and thumb down upon the bit-shank to control the point of the blade'with great nicety. I also deem as important the particular form of the handle-scale-receiving faces of the bolster and butt of the metal part of the tool, which are readily manufacturedby drop-forging.

I claim as my invention 1. As a new article of manufacture, the herein-described screw-driver, consisting, of

the blade, the round shank, conoidal bolster,

handle-web, and butt all formed in onepiec'e, and the handle-scales secured to the said'handie-Web, the handle portion being elliptical in cross-section for the most part, but gradually merging with the conoidal bolster by a gentle taper into the circular tool-shank, thus providing for a firm grasp while facilitating anice control. by pressure of the finger and thumb upon the shank of the tool.

p 2. As. a new article of manufacture, the herein-described screw-driver, consisting of the blade, the round shank, conoidal bolster, handle-web, and butt all formed in one piece of drop-forged metal shaped as described, the handle portion being elliptical in cross-sec- 5 tion for the most part, but gradually merging with the conoidal bolster by a gentle taper into the circular tool-shank, thus providing for a firm grasp while facilitating a nice control by pressure of the finger and thumb upon the shank of the tool.

r WILLIAM S. WVARD. Witnesses:

JAMES SHEPARD, SHEFFIELD H. CLARKE.

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