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Publication numberUS379200 A
Publication typeGrant
Publication dateMar 6, 1888
Filing dateNov 18, 1887
Publication numberUS 379200 A, US 379200A, US-A-379200, US379200 A, US379200A
InventorsJoseph P. A. Hanlon
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 379200 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Mode1 J. P. A. HANLON,

SCREW. No. 379,200. Patented Mar. 6,1888.




SPECIFICATION forming part of Letters Patent No. 3791200, dated March 6, 1888.

Application filed November 18, 1887. Serial No. 255,458. (No model.)'

To all whom, it may concern:

Be it known that I, J OSEPH P. AJHANLON, a citizen of Great Britain, and a resident of Somerville, in the county of Middlesex and State of Massachusetts, haveinvented new and useful Improvements in Screws, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention relates to improvements in screws; and it consists in an improvement in the nick of the head so as to prevent the screwdriver from accidentally slipping out of said nick during the operation of turning the screw in or out of the materialinto which it is to be secured.

The invention is carried out as follows, reference being had to the accompanying drawings, wherein- Figure 1 represents a side elevation of a screw made according to my invention. Fig. 2 represents a central longitudinal section of the head and shank of the same. Figs. 3 and 4 represent plan views of the screw-heads, showing the i mproved nicks therein; and Figs. 5 and 6 represent end views. of screw-drivers used in driving the improved screws.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

a is the screw-shank, having a machine or wood thread out on it, as usual.

b is the head, as usual, in the upper end of the shank a, which head may be made of any of the ordinary formsthat is, cylindrical, semispherical, or tapering-accordingto the uses for which the screw is intended, and I wish to state that I do not desire to confine myself to any particular shape of the head, as this may be varied according to circumstances.

0 in the drawings is the nick in the head, which is made of the usual depth, but instead of being straight, as is common in ordinary screws, it is made serpentine or zigzag from end to end, as shown, respectively, in Figs. 3 and 4. WVith such improved nick I use a screw-driver the lower end of which is made serpentine or zigzag shaped to correspond with the nick in the screw-heads, as shown in Figs. 5 and 6, and by this arrangement the liability of thescrew driver slipping accidentally out of the nick while the screw is being driven or removed is entirely obviated.

The bottom of the nick c is on .a plane at a right angle to the axis of the screw without

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3236275 *Oct 24, 1962Feb 22, 1966Smith Robert DScrew driver with an h-shaped drawing bit
US3808937 *Apr 19, 1972May 7, 1974J RoehrigScrew head
US4025140 *Nov 28, 1975May 24, 1977Tula Machine Co., Inc.Locking device for the prongs of an electrical plug
US4037514 *Feb 23, 1976Jul 26, 1977Juan Andres LliterasHigh torque fastener head
US7013767 *Sep 3, 2004Mar 21, 2006Seim Shannon RScrewdriver/screw unit
WO2006097891A1 *Mar 14, 2006Sep 21, 2006Romain GauthierReversible fixing element
Cooperative ClassificationY10S411/919, F16B23/0015