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Publication numberUS375206 A
Publication typeGrant
Publication dateDec 20, 1887
Filing dateSep 26, 1887
Publication numberUS 375206 A, US 375206A, US-A-375206, US375206 A, US375206A
InventorsE. De Forest Shelton
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 375206 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(3T0 Mode l.) 1



No. 375,206.. Patented Dec. 20. 1887.

N. PUERS, PMlo-Lkhopaphcr. Wahinilbn. D C,




SPECIFICATION forming part of Letters Patent No. 375,206, dated December 20, 1887.

(No model.)

To all whom it may concern.-

Be it known that I, E. DE FOREST SI-IELTON, a citizen of the United States, residing at Birmingham, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Screw-Bolts; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in screw-bolts, lag-screws, and the like, and has for its object to provide a head for said screws or bolts which shall be so conformed that it may be turned by wrenches and tools of various kinds; and with this end in view my invention consists in the details of construction hereinafter fully set forth, and then recited in the claim.

In order that those skilled in the art to which my invention appertains may fully understand my invention, I will now describe my device in detail, reference being had to the accompanying drawing, which forms a part of this specification, and which exhibits a screw-bolt made in accordance with my improvement.

l is the shank of the screw'or bolt, and 2 the threaded portionthereof.

3 is a projecting abutmentshoulder, above which is the head 4., which is square in crosssection and may be grasped by any ordinary wrench. Extending through the head 4, and preferably in both directions, are holes 5, for the insertion of a pin-wrench.

6 is a slot cut into the top of the head to admit of the use thereon of an ordinary screwdriver.

From the foregoing it will readily be seen that my improved bolt-head is exceedingly advantageous, since it may be turned by any one of several implements.

In many connections where such bolts or screws are used it might be found impracticable to use one of the three tools above named, but where the screw might be turned by means of one of the others.

Having thus described my invent-ion, I claim- As an illllJI'OX'Gd article of manufacture, a bolt or screw, the same having the shank 1, the screw-threaded portion 2, the projecting abutmentshoulder 3, the square head 4, the transverse pin-wrench holes 5, and the slot 6, substantially as specified.

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




Referenced by
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US2623427 *Apr 25, 1949Dec 30, 1952Guttman Ornstein GeorgeScrew thread fastener with flexible operator
US2850788 *May 11, 1956Sep 9, 1958Albert J RypyscEmbalming stopper
US2921616 *Mar 24, 1958Jan 19, 1960Northrop CorpCaptive screw and sleeve having mating threaded stop shoulders
US3300239 *Nov 30, 1964Jan 24, 1967Dinkin Leon WStop and magnetic holder for relatively moveable elements
US4190222 *Feb 21, 1978Feb 26, 1980Appleton Electric CompanyElectrical cable connector with cam lock
US4793319 *Mar 12, 1987Dec 27, 1988Norman VaughanArchery bow limb adjustment bolt
US5558674 *Dec 17, 1993Sep 24, 1996Smith & Nephew Richards, Inc.Devices and methods for posterior spinal fixation
US20090148254 *Dec 10, 2007Jun 11, 2009Carrillo Sr DanielFlange headed screw
WO1995016403A1 *Dec 15, 1994Jun 22, 1995Brian J DohertyDevices and methods for posterior spinal fixation
Cooperative ClassificationY10S411/919, F16B23/003