US 1512920 A
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c. E, GALVIN P01-TY :uw scura; xmms HANDLE Oct. 28. 1924.
:und Apr-11 12 v1922 T I I I I i l l Il Frsu Patented @et 28, 1924.
CHARLES EDWARD GALVIN, or SPRINGFIELD, CHIC, AssIGNoR 'ro THR RIDGRLY TRIMMER COMPANY, or SPRINGFIELD, CHIC, A CORPORATION or CHIC.
PUTTY AND SCRAPER KNIFE HANDLE.
Application led April 12, 1922. Serial No.- 551,930.
To all whom it may concern.'
Be it known that I, CHARLES EDWARD GALVIN, of the city of Springfield, county of Clark, State of Ohio, United States of' America, have invented certain new and useful Improvements in Putty and Scraper Knife Handles, of which the following is a specification.
My invention relates to the improvement in molded handles, particularly bakelite and Y similar compositions, for putty knives and Scrapers having blades subjected to bending and torsion strains, and the objects of my invention are, first, to provide means whereby the bakelite is protected against cracking when subjected to stresses induced in the tang of the handle by the blade, second, to provide means ofaligning and keyingr ferrule in exact. position.
l attain these objects in the accompanying drawing, in which- Fig. 1, is a longitudinal section through my knife.
Fig. 2, is a cross section through the handle.
Similar letters refer to similar parts through the severalviews.
My invention relates particularly to that class of knives and tools with flat blade and tang, stamped from sheet` steel, and which are subjected-'to great bending strains in use.. rThe putty and scraper' knife used by glaziers and painters belong to this class, and the'usual. methods of constructing the handles for the same are very old, and consist of using wood as the body of the handle, either as one .piece with the tang inserted, or as half pieces riveted to the talig. A ferrule is often used to bind the parts as well as to give finish to the handle.
The pract-icability of wood for such handles can be attributecVto the strength,
toughness and exibility of wood and its ability to follow without breaking the ex-` cessive bending of the steel tang of the blade. Therefore, in order to use bakelite vor similar compositions, which are stron and tough and will break before they w' bend, for handles in such knives and tools, it becomes necessary to em loy a new construction to compensate or the lack of lflexibility in the bakelite. Just how I accomplish this is described as follows:
By referring to Fig. l, of the drawing, I show' a longitudinal section through a putty knife having my invention.
contact with the corners thereof and slightly spaced apart ,from each other. Withy this relation of the parts, the same are imbedded in molded bakelite l forming a finished handle. As' is well known to the trade when bakelite or similar substances arev molded, a very high pressure and very high temperature are employed so that the two parts of the reinforcing insert D are necessarily pressed upon the tang in such a way as to be indirect contact therewith but otherwise disconnected therefrom. The f cross section Fig. 2, shows how the bakelite C incases the reinforcing insert 1), which in turn surrounds the tang In Fig. 1, it will be noted that the insert D is shorter than the tang E, providing means for anchoring the tang in the bakelite at the but-t end of the handle.
lVhen the bladeof a knife is in use, bend ing ofthe same takes place, and the point of greatest strain being at B in Fig. l, where the tang joins the blade. Since the tang is a continuation of the blade, all strains in the tang concentrate at v B and decrease rapidly toward the butt end of the handle, and in order to arrest these strains before they reach the bakelite of the handle, I employ -the short metal reinforcement D which surrounds the tang, but is not integral with it. The distinct advantage thus gained is very significant, since thev tang may bend -or evenbreak off atfB, which is the critical point of bending, yet the insert D cannot bend at the same point because it ends there, and the deflection of an individual piece is Zero at its end regardless of how it is strained. I also reduce the possible bending in the "insert by making it short, since the bending of any individual piece is directly proportional to its len th. Should my reinforcing member e made integral with the tang, these` favorable conditions would not exist land the .bakelite, as well as the -I find that my method of reinforcing myhandle equally effective with or without the ferrule and shown as F in Fig; 1. However, I use the ferrule to give iinish to the handle and in order to make certain that it will not pull loose from the bakelite, I employ a dovetail slot, shown as G, Figi ll, cut in the edge of the ferrule into whic the bakelite for-ms a key, retainin the same from pulling away. The insert serves to align the errule and hold it securely against the blade shoulder during the operation of molding the handle.
Having thus described my invention, what I claim is:
1. In a tool of the character described, a blade, a iiat tang integrally -formed with said blade, a composition handle, and intermediate means encircling the edges of said tang and 'overlying the 'sides thereof, but
- otherwise disconnected therefrom, whereby CJD the tang will be stiiened independently of the material of said handle.
2. In a tool ofthe character described, a blade, a flat tang integrally formed with said blade, with a shoulder therebetween, a pre-formed reinforcing member Y surrounding both the sides and edges of said tang for sti'ening the same and terminating at said shoulder, said member being of substantially the same width throughout its length, said reinforcing member being of a character to enable it to be slipped on said tang with a .close t but being otherwise disconnected therefrom, and an outer composition handle member molded upon said tang and reinforcing member.
3. In a tool of the character described, a blade, a fiat tang inte ally formed with said blade, with a shoudrer therebetween, a
air of reinforcing members on said tang or stil'ening the same and terminating vat said shoulder, each member being substan` tially U-shaped in cross-section and of substantially the same `Width throughout its lengthso as to surround one edge and portions of the sides of said tang. with a close lit but otherwise disconnected therefrom, and an.v outer composition handle member molded upon said tang and reinforcing member.
4. In a tool of the character described, a blade, a flat tang integrally formed with said blade, with a shoulder therebetween, a reinforcing member for said tang adapted to be placed on said tang with a comparatively close fit in direct contact therewith,
but otherwise disconnected therefrom, said reinforcing member surrounding both .the sides of the tang and the edges thereof, the outer faces of those portions which surround the edges being of a rounded character, and an outer composition handle Imember molded upon said tang and reinforcing member.
5. In a tool o the character described, a blade, a fiat tang integrally formed with said blade, with a shoulder therebetween, a pair of reinforcing members on said tang and terminating at said shoulder, each reinforcinv member being formed to inclose one of the edges and portions of the sides of said tang with space between the edge of said reinforcing members, and an outer composition handle member molded upon said tang and reinforcing members and within the space between said reinforcing members.
6. In a tool of the character described, a blade, a tlat tang integrally formed with said blade, with a shoulder therebetween, a stiening member encircling the ed es of said tang and overlying the sides t ereof for stiiening the same, said stienin member terminating at said shoulder an abutting against the same, a composition handle molded on said tang and stiiieningv member,
,and a errule imbedded in the material of said handle and also abutting said shoulder.
CHARLES EDWARD GALVIN. `lilvitnesses: v'
WILIJAM C. Rrcnn'rrs,
J. 0. WILMAMS.
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