US2683931A

US2683931A - Knife

Info

Publication number: US2683931A
Application number: US300751A
Authority: US
Inventors: Gordon L Fahlgren
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-07-24
Filing date: 1952-07-24
Publication date: 1954-07-20
Anticipated expiration: 1971-07-20

Description

July 20, 1954 G. L. FAHLGREN KNIFE Filed-July 24, 1952 Fig. 2

Gordon i... fab/grew INVENTOR.

Patented July 20, 1954 UNITED STATES ATENT OFFICE KNIFE Gordon L. Fahlgren, Vallejo, Calif.

Application July 24, 1952, Serial No. 300,751

3 Claims. l

This invention relates in general to knife constructions, and more specifically to a knife handle for holding safety razor type blades.

The primary object of this invention is to provide an improved knife handle for holding safety razor type blades, said handle being of such a construction whereby the blades associated therewith rnay be telescoped therewithin.

Another object of this invention is to provide an improved knife handle which is designed pri- '-f marily for use with safety razor type blades and includes a chuck-type clamping means at the forward end thereof for receiving the razor blades selectively slidable therethrough, said razor blades being secured at their rear ends to a movable weight when disposed within the knife handle, the weight being in the form of a magnet whereby the razor blades may be quickly and easily attached thereto.

A further object of this invention is to provide an improved knife handle construction which is adapted to be utilized in combination with a safety razor type blade, said handle construction having clamp means at the forward end thereof which has a length equal to one-half of ly pointed out in the appended claims, and illustrated in the accompanying drawings which form a material part of this application and in which:

Figure 1 is a perspective view of the knife construction, which is the subject of this invention, and shows the razor blade in an extended position;

Figure 2 is an enlarged longitudinal vertical sectional View taken substantially along the center line of the knife construction of Figure 1 and shows the general construction thereof;

Figure 3 is an enlarged transverse vertical sectional view taken substantially upon the plane indicated by the section line 3 3 of Figure 2 and shows the general cross-section of the handle of the knife construction and the relationship of a stop pin mounted therein;

Figure 4 is an enlarged transverse vertical sectional view taken substantially upon the plane indicated by the section line 4-4 of Figure 2 and shows the general relationship of a razor blade with respect to the chuck-type clamp means at the forward end of the handle; and

Figure 5 is a fragmentary longitudinal vertical sectional View similar to Figure 2 and shows the construction of the forward end of the knife, the razor blade and its attached weight being shown in retracted positions.

Similar characters of reference designate similar or identical elements and portions throughout the specification and throughout the different views of the drawings.

Referring now to the drawings in detail, it will be seen that there is illustrated the improved knife construction, which is the subject of this invention and is referred to in general by the reference numeral I0. The knife construction I0 includes a handle, which is referred to in general by the reference numeral I2 and a conventional safety razor type blade i4, the razor blade I4 being carried by the handle I2.

Referring now to Figure 2 in particular, it will be seen that the handle I2 includes an elongated body portion I6 having a bore I 8 through the rear portion thereof. The bore I8 is of a diameter to receive spare blades I4 and is closed by a removable closure cap 20 threadedly engaged in the rear end of the -body portion I6. The inner end of the bore IB includes a portion 22 of a reduced cross section, the portion 22 being of a diameter which does not permit the passage of the spare blades hl (not shown) adapted to be carried within the outer portion of the bore IB.

It will be noted that the forward end of the body portion I6 is of a reduced cross section and includes a forward portion 24 which is of a lesser diameter than a rear portion 26 of the reduced cross sectional front part and joined thereto by a tapered intermediate portion 28. The rear portion of the front part of the body portion I6 is provided with outwardly projecting external threads 30 with which are engaged threads of a collet 32 telescoped over the front part of the body portion I6. In order that the front part of the body portion I6 may be utilized to clamp the razor blade I4, the same is provided with a pair of diametrically opposite longitudinally extending slits 34 which terminate in enlarged circular openings 36 which prevent further splitting of the front part of the body portion I6. It will be noted that the slits 34 divide the front part of the body portion I6 into a pair of generally semi-circular cross sectional jaws 38.

It will be understood that the razor blade I4 is to be positioned between the jaws 38 and clamped therebetween by tightening down on the collet 32 which has shoulder portions 40 which engage the intermediate portions 28 to urge the jaws 38 together. It will be seen that when the collet 32 is loosened, the razor blade I4 is free to slide between the jaws 38. In order that the entire length of the razor blade I4 may be utilized, the jaws 38 have lengths equal to onehalf of the length of the razor blade I4 so that when the same is reversed there is no wasting of the edge thereof.

It will be understood that it is desirable to provide means which will automatically position the blade I4 between the jaws 38. Therefore, the forward portion 22 of the bore I8 has slidably positioned therein a weight 42. In order that the razor blade I4 may be conveniently attached to the weight 42, the weight is in the form of a magnet and is attached to the razor blade I4 by merely contacting the two.

Inasmuch as the weight 42 is in the form of a magnet, it will be understood that the body portion I6 must be formed of a non-magnetic material such as aluminum, brass, copper, plastic or other suitable materials.

It will be understood that the forward portion 22 of the bore I8 terminates at the rear end of the jaws 38 whereby the rear ends of the jaws form a stop for the weight 42. In order` that the razor blade I4 may be fully retracted within the jaws 38 and stopped in that position, the body portion I3 is provided with a transverse pin 44 adjacent the rear end of the forward part 22 of the bore I6. It will be understood that the distance from the transverse pin 44 to the forward ends of the jaws 38 is equal to the length of the razor blade I4 plus the length of the weight 42.

When it is desired to utilize the knife I8, the collet 32 is slightly unscrewed and the knife positioned with the blade end down. The blade I4 is then forced out from between the jaws 38 by the force of gravity upon the weight 42. The blade I4 is then retained in its extended position by tightening down upon the collet 32. When it is desired to retract the blade I4, the collet 32 is once again loosened and the knife I inverted. The downward movement of the weight 42 moves the razor blade I 4 to within the confines of the jaws 38 and the collet 32 is tightened down to retain the same in that position.

The operation of this device will be understood from the foregoing description of the details thereof, taken in connection with the above recited objects and drawings. Further description would appear to be unnecessary.

Minor modifications of the device, varying in minor details from the embodiment of the device illustrated and described here, may be resorted to without departure from the spirit and scope of this invention, as dened in the appended claims.

Having described the claimed as new is:

1. A knife comprising an elongated tubular handle, said handle terminating at one end in opposed jaws, a collet carried by said handle for urging said jaws into clamping relation, an elongated blade slidably received between said jaws, a gravity actuated weight disposed within said handle and engageable with said jaws to limit outward movement thereof, said handle and said jaws being formed of a non-magnetic material, said blade being formed of a magnetic material, and said weight being in the form of a magnet, said blade being removably connected to said weight by magnetic attraction, said Weight being slidable within said handle to position said blade between said jaws.

2. A knife comprising a handle having an elongated body, a blade having a longitudinally extending cutting edge, said blade being formed of a magnetic material, clamp means at one end of said body for clamping said blade in selected position therein, said body including a tubular portion having slidably disposed therein a gravity actuated weight removably attached to said blade and facilitating movement of said blade from an extended position to a retracted position, said weight being engageable with said clamp means to limit outward movement of said blade, said body being formed of a non-magnetic material, said weight being in the form of a magnet.

3, The knife of claim 2 wherein said clamp means includes jaws having lengths equal to one-half the length of said blade whereby only one-half of said cutting edge is exposed at one time.

invention, what is References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 10,335 Boman June 5, 1883 1,008,734 Ruehs Nov. 14, 1911 1,704,376 Teasdale Mar. 5, 1929 2,223,422 Jones Dec. 3, 1940 2,550,775 Clark May 1, 1951 2,604,693 Schierstead July 29, 1952