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Publication numberUS71909 A
Publication typeGrant
Publication dateDec 10, 1867
Publication numberUS 71909 A, US 71909A, US-A-71909, US71909 A, US71909A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improved double screw
US 71909 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

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' Letters Patent No. 71,909, dated December 10, 1861.


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Be it known that I, ELIJAH S. Pinson, of Hartford, in the county of Hartford, and State of Connecticut, have invented a new and useful article of manufacture, being an Improved Double Screw; and do hereby declare that the `following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Figure 1 shows two views of the improved double screw, with ahead having slots or nicks out in opposite sides for the purpose of turning-it. A

Figure 2 shows two views of the improved double screw, with the head flattened on opposite sides for theA same purpose.

A A, Ste., are the screw-threads at each en d of the double screw. B B, dto., are the heads. C C, dac., are sections in the middle of the heads. My invention consists in providing a. double screw with an intermediate head for the purpose of turning it,

and also for the purpose of preventing one end ofthe screw from penetrating too far when the double screw is` used for uniting two diferent kinds of wood, or other material, when one is softer and morel easily penetrated l than the other.

The improved double screw is made b y striking up thel head oula. wire of the proper size, and cutting the threads in the ordinary manner for single screws. It can also be made by turning down to the proper shape and size from a larger rod or wire. Two ordinary screws can also he united together to obtain the same form. 'The improved double screw is useful in attaching handles or ornaments to drawers or doors, `and for any other purposes to which straight wires with a. thread out at both ends are now applied.

With the improved double screw, no especial care need be taken in preparingV the holes for its reception,

as it will enter each of the two parts to be'joined as far as the head, which will prevent 4farther entrance when it has reached the surface, so that when the two parts are brought together, as in screwing on a knob, the head will remain `between the two parts united, and the screw will enter each of the two parts equally, if the branches of the screw are of the same length. Were it not for the head, the screw` would turn more easily, and farther into the softermaterial.

Claim. I claim the double screw herein described and shown, as a new article of manufacture.



L. WooDnoUsE, Trino. G. ELLIS.

Referenced by
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US3276172 *Jul 20, 1964Oct 4, 1966Goetaverken AbMeans for detachably connecting partition walls
US4171569 *Oct 19, 1977Oct 23, 1979Star Dental Manufacturing Co., Inc.Dental pin
US4611093 *Jan 20, 1984Sep 9, 1986Colt Industries Operating CorpFor use with a transformer
US4887385 *Dec 7, 1987Dec 19, 1989James Naylor LimitedConnecting means for frangible and/or friable articles
US5842319 *May 5, 1997Dec 1, 1998Ravetto; George D.Invisible decking connector
US8551137 *Jul 30, 2009Oct 8, 2013Covidien LpDouble threaded tissue tack
US20100049244 *Jul 30, 2009Feb 25, 2010Tyco Healthcare Group LpDouble threaded tissue tack
US20120109188 *Oct 28, 2010May 3, 2012Tyco Healthcare Group LpWound Closure Device Including Barbed Pins
Cooperative ClassificationF16B35/042