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Publication numberUS805072 A
Publication typeGrant
Publication dateNov 21, 1905
Filing dateMay 22, 1905
Priority dateMay 22, 1905
Publication numberUS 805072 A, US 805072A, US-A-805072, US805072 A, US805072A
InventorsIsaac Jackson
Original AssigneeIsaac Jackson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tool for detaching fasteners.
US 805072 A
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Description  (OCR text may contain errors)

No. 805,072. PATENTED NOV. 21, 1905. I. JACKSON.



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Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed May 22, 1905. Serial No; 261,720.

To (all whom it may concern:

Be it known that I, IsAAo JAoKsoN, a subject of the King of Great Britain, residing at Glossop, in'the county of Derby, England, have invented certain new and useful Improvements in Tools for Detaching Fasteners, of which the following is a specification.

It has been found advantageous in some classes of fasteners to disconnect the fastener or a member thereof from the object or article to which it is applied by rotating the head of the fastener, in some cases bending or breaking the connecting part, as when the fastener is a rivet with prongs, or merely detaching the head from another member, as when the fastener is a thin bolt or nut. Difficulty has been experienced, especially when the head of the fastener to be turned is thin and easily bent, in securing a proper hold upon the same, and to remedy this difficulty I make use of a tool of the character hereinafter described, and illustrated in the accompanying drawings, in which- Figure 1 is a perspective view showing my improved tool and one arrangement of its energy-lug. Figs. 2, 4, and 5 are side views showing the tools with different arrangements and forms of lugs. Fig. 3 is a plan of Fig. 2. Fig. 6 is a side view of a form of fastener with which the tool can be used. Fig. 7 is a plan of the fastener, Fig. 6.

The tool consists of a head 1 and a handle 2 and one or more lugs or projections 3, proj eating from the plane of the head, with edges or bearing-faces diverging outwardly from the head.

As shown in Fig. 1, the lug 3 is dovetailed to present two edges a: x, diverging outwardly from the plane of the head 1. I11 Figs. 2 and 3 there are two dovetailed lugs 3 3. In Fig. 4 the two lugs have the inclined edges nearest the handle, the other edges being perpendicular to the plane of the head. In Figs. 2, 3, and 4 the lugs are at the side or beyond the periphery of the head. In Fig. 5 the lugs project from the lower face of the head. The member or part B of the fastener to be engaged by the tool has slots or openings 6, with beveled bearing edges arranged to receive the lugs 3 3, so that when the lugs are inserted therein and the handle is carried round the aXis of the fastener the undercut or inclined edges of the lugs will bite under theedges of the slots and will tend to draw down the head 1 of the tool onto this part to be turned, so that a great force can be applied to the handle sufficient to break the part B from its stems, if necessary, without danger of the tool slipping from its bearings and without danger of bending the part B in the operation. In the construction shown in Fig. 1, where there is one lug 3, it is dovetailed or has reverse inclines and will engage and bite the fastener when the tool is turned in either direction. In Figs. 2 and 3 the two lugs 3 bite the fastener in turning in both directions. In the construction of Figs. 4 and 5 one of the lugs will bite the fastener in turning in one direction and the other in turning in the opposite direction, the lug which does not bite the fastener serving as a bearing or steadying in only.

It will be evident t at the head of the tool may be a disk or ring and that any desired number of lugs may be arranged thereon.

Preferably the lower edges of the lugs 3 are rounded, as shown in Figs. 2 and 3, so as to avoid cutting into the material to which the fastener is applied.

WVithout limiting myself to the construction and arrangement shown, I claim- I 1. A tool for detaching fasteners, having a head and lugs projecting from the lane of the same, the bearing-faces of said ugs diverging outwardly from the head, substantially as described.

2. A tool for detaching fasteners, having a head and lugs projecting from the plane of the head, the opposite bearing-faces of each lug diverging outwardly, substantially as described.

3. A tool for detaching fasteners, comrising a handle, a head, and lugs projecting from the plane of the head, the bearing-faces of said lugs diverging outwardly from the head, the lower faces of the lugs being rounded, substantially as described.

4. A tool for detaching fasteners having a head and engaging means projecting from the plane of the same, whose bearing-faces diverge outwardly in opposite directions from the head, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2490739 *Jan 2, 1947Dec 6, 1949Nesbitt Charles HExtension handle for wrenches
US2688134 *Mar 8, 1952Sep 7, 1954Dickson Jacob LStaple removing and clinching tool
US2802382 *Feb 19, 1954Aug 13, 1957Adams Oliver FTool for removing speednuts
US3234824 *Mar 4, 1963Feb 15, 1966Lyvers Garland ETool for removing internal selflocking retaining rings
US4794995 *Oct 23, 1987Jan 3, 1989Diamant Boart-Statabit (Usa) Inc.Orientable fluid nozzle for drill bits
US7494311 *Apr 19, 2003Feb 24, 2009Fuerle Richard DUndercut screw and matching bit
Cooperative ClassificationB25B27/00