US 375206 A
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(3T0 Mode l.) 1
E. DE P. SHBLTON.
No. 375,206.. Patented Dec. 20. 1887.
N. PUERS, PMlo-Lkhopaphcr. Wahinilbn. D C,
UNITED STATES PATENT OFFICE.
E. DE FOREST SHELTON, or BIRMINGHAM, CONNECTICUT.
SPECIFICATION forming part of Letters Patent No. 375,206, dated December 20, 1887.
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.
E. DE FOREST SHELTON.
ERNEsT S. STArnns, WILLIs K. HEATH.