US1993170A - Tool handle - Google Patents

Description

March 5, 1935. HAVENER 7 1,993,170

TOOL HANDLE Filed May 8, 1953 -r v ,l /4

Patented Mar. 5, 1935 UNITED STATES 1,993,170 roof. mums Arthur 1:. Banner, Wayland, Mus alcignor to Judson L. Thomson Manufacturing 00., Waltham, Mala, a corporation of Massachusetts Application my s, 1933, Serial No. 669,920

ZClaims.

This invention relates to handles for tools and implements of various kinds and is exemplified in a knife handle.

Heretofore it has been customary to fasten handle portions to the shanks of tools by the use I of rivets of various forms. A common practice has been to use two piece rivets and to fasten the handle portions at three different points by three separate operations since no satisfactory means have heretofore been devised for setting all the two piece rivets simultaneously without incurring the risk of one or more defective settings. Separate settings, however, slow down the fastening operations and increase the expense thereof.

One of the important objects of the invention is the provision of a two piece rivet of such form as to permit all the rivets to be set simultaneously without any risk of defective settings.

Another object is the provision of a method for fastening handle portions to the shank of a tool at a plurality of points simultaneously in order to reduce the cost of the operation.

A further object is to provide a method which 26 permits a cheaper rivet to be used without detracting from the durability and efficiency of the fastening means.

Other objects of the invention will in part be obvious and in part appear in the following description.

The invention accordingly comprises an article of manufacture having the novel features and arrangement of elements and a method for producing it comprising the various steps as exemplifled in the following description and pointed out in the In the accompanying drawing illustrating the embodiment of my invention in a knife handle, Figure 1 is a top plan view of the handle portion and part of the blade of a knife; Fig. 2 is a side or edgewise elevation of the same; Figs. 3 to 6 inclusive are longitudinal, central sectional views on an enlarged scale of a portion of the knife handle including one fastening means to illustrate progressively the method of fastening handle portions to the shank of a knife, Fig. 3 showing the handle portions in position on the shank of the knife; Fig. 4 showing a tubular member inserted in'one side of the handle; Fig. 5 showing the said tubular member after its end has been upset within the bore; Fig. 6 showing the plug inserted in the knife handle and having its end locked in the tubular member for a completion of the fastening operation; and Fig. 7 is a similar view illustrating the method of fastening when the shank of the knife is provided with holes smaller than the bores in the handle portions.

Referring to the drawing, 10 indicates a knife blade having a shank portion 12 with two handle portions Hand 16 fastened thereto on opposite sides by a plurality of fastening means preferably shown as being three in number. The shank of' the knife is provided with a longitudinal series of three holes 18 and the handle portions 14 and 16 with a similar series of three holes or bores 20 and 22 respective1y, the outer ends of said bores havi'ng countersinks 24 and 26 respectively.

-"The two handle portions are fastened to the knife shank by a plurality, preferably three, of two piece rivets, each comprising a tubular member 28 into which is tightly fitted the end of a plug member 30. Both members have expanded heads 32 and 34 respectively, fitting the countersinks in the handleportions, preferably 'fiush with the outer surface thereof. The diameter of each tubular member is less than the inner diameter of the bore in which it is mounted thereby permitting its end to be turned over or upset within the bore.

In Figure 7 is illustrated a modified structure in which the hole in the knife shank is made smaller than the bores in the handle portions in order that when the plug is forced into the tubular member expanding it, the hole in the knife shank will be completely filled and the metal of the tubular member will be caused to overflow the edges of said hole on both faces of the shank. This construction results in a very effective lock between the shank of the knife and the two parts of the rivet and contributes to the durability of the fastening in use.

The method of fastening the handle pieces to the shank of the knife. consists first in preparing the handle portions and the shank with a plurality of holes or bores all of the same diameter arranged in a longitudinal series so that they register when the handle portions are placed in position on the shank and in providing said bores with countersinks on the outer faces of .the two handle portions. The handle portions are then arranged in proper position on opposite sides of the shank and tubular members are-inserted in the bores in one side of the knife handle with their heads fitting the countersinks on that side and all their inner ends are upset simultaneously by any suitable multiple mechanism. The tubular members are of slightly less diameter in their tubular portions than the diameter of the bores so that the upset ends fill up the bores are forced to some extent into the surrounding walls of the bores.

The next step consists in inserting the plug members in the other side of the knife handle anddriving eachplug into a tubular member until its head is seated in'a countersink, all of the plugs being driven simultaneously by any suitable multiple mechanism. To facilitate this operation the ends of the plugs may be tapered which, with the upset ends of the tubular members, eliminates all possibility of defective settings.

The foregoing method is also applicable to the modified form of fastening shown in Figure '7 since the only changeis one-of result due to the fact that the hole in the knife shank is smaller than the bores'in the handle portions.

oneoftheadvantagesofmyinventionisthat .ashortertubularmembermaybeusedthanhas been common heretofore which effects a material reduction inthe cost of the rivets without a production of finished handles and further reduces the cost thereof.

What Iclaim is:

1. Thecombination withatoolshankoiapair of handle portions on opposite sides of said shank, said shank'and said handle portions being provided with a plurality of thmigh and through bores having countersinks on the outer face of each handle portion, the bores in said shank being smaller than the bores in said handle portions, and means for fastening said parts together comprisingatubularmembermo'untedineachofthebores in one of said handle portions and having aheadseatedinthecountersink ofsaidbore, said member extending through said shank and filling the bore therein but having an outside diameter smaller than the inside diameters -of the bores in said handle portions and having an upset end in'the other handleportion adjacent said shankandaplugmounted ineachoftheboresin said other handle portion and having a head seated-in the countersink of the bore-and its end frictionally locked in said tubular member, said tubular member being expanded thereby to fill the bore in said shank and to overlap the edges of said hole-on both faces of said shank tolock the tubular member thereto. I

2. The combination with a tool shank of a pair .of handle portions on opposite sidesof said shank,

said shank and said handle portions being provided with a plurality of through and through bores,theboresinsaidshankbeingsmallerthan the bores in said handle portions, and means for fastening saidpartstogethereomprisinga headed tubular member moimted in each of the bores inone of said handle portions andextending through said shank, filling the bore therein,

andhaving itsendintheotherhandleportion' adiacent'said shank and a headed plug mounted ineachoftheboresinsaid otherhandleportion with its end frictionally locked in said tubular member, said tubular member being expanded therebytofilltheboreinsaidshankandtooverlaptheedgesofsaidboreonbothfacesofsaid shanktolockthetubularmemberthereto.

ARTHUR R. HAVENER.

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