US 1472826 A
Description (OCR text may contain errors)
Nov. 6, 1923.
T. CHAMPLIN KNIFE Filed June 17, 1922 INVENTOR.
77m Champ/In Patented Nov. 6, 1923.
TINT cHAMrL rN, or LITTLE VALLEY, NEW YORK.
Application filed dune 17, 1922. Serial No. 569,159..
To all whom it may concern Be it known that I, TINT CHAMILIK, a citizen of the United States, residing at Little Valley, in the county "of Cattara'ugus and State of New York, have invented certain new and useful ImprovementsinKnives, of which the following is a specification.
This invention relates to an improvement in knives and particularly to a knife in the handle of which is imbe'ddeda compass such as is shown, for exainple', in my Patent No. 1,115,780 dated November 3, 1914.
As pointed out in that patent it has been found adv'a ntageous, instead of making the portions of the knife in proximity to the compass of non-magnetic material, to make the knife in the usual manner of iron or steel and s0 arrange and construct certain of the parts that they may be formed to function as a horseshoe magnet. The compass is so lo cated with respect to this magnet that the attraction of the metal parts of the tool will be equalized and have no influence upon 7 the compass needle.
The knife covered by my previous patent has proven to be entirely successful but has been open to the objection that the magnetized can-opener blade and screw-driver and bottle-opener blade lose their power after a certain time. This action would be well understood if we consider the fact that inhorseshoe magnets, such as these blades to all intents and purposes are, it is the general practice to provide a keeper for each magnet which when the magnet is not in use will connect the two ends, thus preventing any loss of power.
The object of this invention is to provide in a knife of the construction shown in my earlier patent, keepers. which will connect the ends of the magnetized blades when they are folded within the handle of a knife, and thus prevent this loss of power.
Other objects will appear from an examination of the following description taken in connection with the drawing which forms a part thereof and in which,
Figure 1 is a side elevation of a knife embodying this invention;
Fig. 2 is a similar view of the knife with the side cover in which the compass is mounted removed; and
Figs. 3 and 4 are sectional views taken along the lines 3-3 and 4-4 of Figs. 1 and 2, the can-opener and screw-driver and bottle-opener blades being closed.
Referring tothe drawings the. reference numeral 10 is used to designate the handle of a knife, forming one embodiment ofthis invention, provided with a can-opener blade 11,1a screw-driver and bottle-opener blade 12,51. leatherpunch blade 13, blade 14; blades 11 and 13' being placed at one end of the knife and blades 12 and 14 at the other end. The blades are enclosed within the outer scales 15 and 16 and separated by the intermediate scale 17 Suitable back springs 18 and 19 are provided to holdthe blades'in their proper position and on the outer scales are mounted the covers 20 and 21.
In the cover 21, near the blades 12 aiid.l4, is imbedded a compass 22 and at each side of .the compass are imbedde'd'short stripsjof soft iron 23 andv 24 whi'ch'bear against the scale 15 and have a function which will be described later. y I
The can open'e'r blade 11 and screw-driver and bottle-opener blade 12 are both slightly magnetized. The legs 25 and 26 constitute the positive and negative poles of the blade 11 while the legs 27 and 28 constitutethe positive and negative poles of the blade 12.
Vhen the blades 11 and 12 are folded as shown in dotted lines in Fig. 2 and in sections in Figs. 3 and 4 it will be noted that the soft iron strip 23 extends across the poles 25 and 26 and the soft iron strip 24 extends across the poles 2'7 and 28. Thus the strips 23 and 24 function in the same manner as the keepers for horseshoe magnets previously referred to. \Vhile these keepers are not directly'in contact with the blades 11 and 12 it has been found that by their use the magnetic properties of the blades have beem retained without impairment for a long period. Since it is absolutely essentiol for the proper action of the compass needle that the blades 11 and 12 retain-their magnetism, the advantage gained by theuse of such keepers is of the utmost importance.
The compass is mounted with the letters N and S on the dial in alinement with'the blades 13 and 14 and the letter .N nearer the blade '14. When it is desired to determine direction the blades 13 and 14 are fully opened, thus counterbalancing the action upon the compass needle. The blades 11 and-12 however are placed in the half-open position shown in Fig. 1 and form with the back spring 18 a complete horseshoe magnet made up of two separate horseshoe magand a. cutting nets, that is to say the blades 11 and 12. With the knife blades so positioned and the knife placed upon a level surface so that the compass needle is free to move it will be found that the needle, being unhampered, responds to the magnetic influences of the earth and points to the north and the knife is turned until the blades 13 and 14: come into alinement with the needle, at Which position it will be found that the blade 1d indicates the magnetic north pole of the earth.
While one embodiment only of this invention has been shown and described, applicant is not to be limited thereby, since it is obvious that other embodiments may be made withoutdeparting from the spirit and scope of the invention as set forth in the following claims.
Having thus described my invention, that which I claim asnew and for which I desire the protection of Letters Patent of the United States is the following:
1. In a knife having a handle, a compass imbedded in said handle, and magnetized blades pivoted at each end of said handle, each blade having two legs, and keepers carried by said handle to extend across the legs of each blade when the blades are closed down into the handle of said knife.
2. In a knife having a handle, a compass imbedded in said handle, and magnetized blades pivoted at each end of said handle, each blade having two legs, keepers imbedded in said handle to extend across the legs of each blade when the blades are closed down into the handle of said knife.
3. A knife comprising a handle, a com pass imbedded in said handle, blades pivoted at each end of said handle, scales enclosing said blades, each of said blades being magnetized and including two legs, soft iron strips in said handle bearing against one of said scales, said strips being so located that they extend across the legs of said blades when the latter are closed down into the handle of said knife.
4., A knife comprising a handle, a compass imbedded in said handle, outer scales, a middle scale, blades pivoted at each end between said'middle scale and one of said outer scales, each of said blades being magnetized and including two legs, and soft iron strips in said handle at each side of said compass, said strips being so located that they extend across the legs of said pivoted blades when the latter are closed down into the handle of said knife.
In testimony whereof I aflix my sig-V nature.