US 1463573 A
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Description (OCR text may contain errors)
T. CHAMPLIN KNIFE Jy' 3i; 1923. 1,463,573
Filed June 17, 1922 WHT (hemp/in j Patented .iuly 3l, 1923.
Application lecl June 17,
3, 1914. The knife embodying this inven tion like the knife shown in my earlier patent i-s composed in the usual manner of iron or steel and it is not made, as has been previousl the custom, of certain non-.magnetic material. It differs therefrom in that there are blades at one end only instead of at both ends.
The chief` object of this invention is to construct and arrange the parts of the knife having blades at one end only so that the magnetic influence thereof will be entirelycounteracted, and the needle of the compass will be free to respond to the magy netic influences of the earth.l
Other objects will appear from a consideration of the specification and of the drawings which form a part thereof and in which,
Figure 1 is a side elevation of one embodiment of this invention;
Fig. 2 is a side elevation of such lmife with one of the blades and the outer scale adjacent to it removed; and
Fig. 3 is a side elevation of the butt lof the knife taken from the opposite side with one of the outer scales removed.
Referring to the drawings the reference numeral 10 is used to designate the handle or casing of a knife embodying this invention, which knife is provided with a cuttin blade 11 and a combined can-opener an bottle-opener blade 12. These blades 11 and 12 are both pivoted at the same end of the knife at either side of a middle scale 13. Suitable outer scales 14 and 15 are provided to hold the blades in place and thus complete the knife. The end of the scale 13 adjacent the blades 11 and 12 is extended to form a screw-driver 16 and is `cut away at 17 as shown particularly in Fig. 2 so as to reduce as m'uch as possible the amount of metal without impairing the function of the scale. A back spring 18 is provided to 1922. Serial No. 569,160.
coact with the blade 12 and a similar spring (not shown) Iis provided to coact with the blade 11. These springs of course function 1n the usual manner to hold the blades either closed, half opened, or fully opened.
The blade 12 is magnetized slightly, the leg 19 constituting the positive Apole and the leg 20 the negative pole. As shown in dotted lines in Fig. 2 the blade is constantly 1 n contact with the\back spring 18. The spring 18 is also magnetized slightly and with the blade 12 formsv a horseshoe magnet, which encloses the lcompass and counteracts the influence of the blade 12 thereon. The part of the spring away from the blade 12 is curved as at 22 and terminates at 21 at the top of the handle, the end 21 constituting one pole of the combined ma et.
he compass 23 is embedded in the cover 24 on the outer scale 15 and is set with the letter N of the dial nearest the blade end of the casing. This compass is magnetized and when the blade 12 is closed, lies 1n the lines 'of force between the legs 19 and 20 so that its magnetism is retained. A bail 26 is fixed to the butt of the knife and not only acts as a means to which a lchain could be applied but also acts vto counteract the influence of the cutting blade 11.
When it is desired to determine direction, the knife is arranged as shown in Fig. 1 with the cutting blade 11 fully opened and the can-opener and bottle-opener blade 12 half opened. The knife so set up is laid on its side with the compass uppermost and leveled so that the compass needle is free to move. Since the back spring 18 and the blade 12 are both magnetized and form a horseshoe magnet which encloses the compass, they counterbalance each other and have no effect upon the accuracy of the needle. The compass is mounted somewhat nearer the blade end of the knife and by reason of the cutting away of the scale 13, the attraction of the end portions of the scale are equalized.
While one embodiment -only has been shown and described, applicant is not to be limited thereby, since it is obvious that other embodiments could be made without departing from the spirit and scope of the invention asA set forth in the Ifollowing claims.
Having thus described my invention, that which I claim as new and for which I de# sprin 3. knife having a handle, a cuttlng blade and combined can-opener and bottleopener blade pivoted at one of said handles,
said opener'blade being magnetized and having two legs forming poles oppositely magnetized, a magnetized back spring contacting with said opener blade, one end of said spring being continued to terminate at the top of said handle, the blade and spring together constituting a horseshoe magnet, and a compass embedded in said handle so as to be enclosed by said magnet.
4. A knife having a handle, blades pivoted at one end only thereof, one of said?, blades being magnetized and having two;
legs constituting the opposite poles, and a magnetized compass embedded in said handle and so positioned as to lie in the lines of force between said legs when said bladel is closed. v
In testimony whereof l alix my signature.