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Publication numberUS2729889 A
Publication typeGrant
Publication dateJan 10, 1956
Filing dateApr 2, 1952
Priority dateApr 2, 1952
Publication numberUS 2729889 A, US 2729889A, US-A-2729889, US2729889 A, US2729889A
InventorsTrinski Edmund F
Original AssigneeTrinski Edmund F
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Detachable cutter blade
US 2729889 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Jan. 10, 1956 E. F. TRINSKI 2,729,839

DETACHABLE CUTTER BLADE Filed April 2, 1952 Edmund F. Tr/ns/u' INVENTOR.

United States Patent LDET-ACHA-BLE CUTTER BLADE Edmund Trinski, East Chicago, Ind. Application April2,1952,'srial.No. 279,971.

1 .Claim. (Cl.30--286) This invention relates to a hatchet cutter bladeand particularly to a detachable cutter blade to be mounted inplaceof 'a regular blade on a hatchet for cutting roofing, la'th or other such materials.

In the operationofapplyingroof:coverings, floor coverings and such like it is necessary to have an exceedingly sharp cutter available and for this purpose it has been customary to use a razor-type device for doing the cutting on the material being worked with. The cutter blade for such material must be extremely sharp and available for immediate use. Because of its sharpness and the necessity of immediate availability such blades are extremely dangerous to handle and workmen are frequently cut when reaching for their razor blade.

The present invention provides an attachment for placing such blades in a convenient position on the normal blade of a hatchet so that it is always available and can be operated without the necessity of handling the blade itself so that there is little danger of an operator being injured because of the blade.

This is accomplished by providing a blade seat adjacent the position of the normal cutting edge of a hatchet blade and mounting a razor blade on the seat and cutting away a portion of the normal hatchet blade to expose the proper portion of the cutter blade. The cutter blade is normally held in position by means of a guard plate which may be attached by any suitable means so as to clamp the blade in position on the normal hatchet blade.

It is accordingly an object of this invention to provide an improved cutter.

It is a further object of this invention to provide an improved cutting attachment for a hatchet.

It is a further object of this invention to provide a hatchet with a renewable cutter blade.

Other objects and many of the attendant advantages of this invention will be apparent from the following detailed description taken in conjunction with the accompanying drawing in which:

Figure l is an elevation of a hatchet having the cutting attachment applied thereto;

Figure 2 is an end view of the outside of a hatchet with the cutting blade and guard in position;

Figure 3 is a vetrical section taken substantally on the plane indicated by the line 33 of Figure l and showing in fragmentary section an enlarged portion of the hatchet blade showing the seat therein, the guard over the blade on the seat and a screw means for clamping the guard into contact with the blade to provide a rigid mounting therefor;

Figure 4 is a plan view of a trapezoidal blade for use in such a cutter; and

Figure 5 is a plan view of the guard plate for overlying the cutter blade to prevent injury thereto or thereby.

In the exemplarly embodiment of the invention, a hatchet is provided with a pole 12 for driving nails or other hammering operations and has an eye 14 for receiving a handle 16 and an upstanding blade portion 18. Such construction being normal for roofers, or lathers,

hatchets and in no way a portion of the present invention.

According tothe present'invention the blade 18 of the hatchet ElSIPI'OVldBd with a cutting attachment comprising a bladeseat 20 cut into or recessed into the face of the blade IS'adjacentth'e normal position of the cutting edge thereof. Preferably theseat has aflat face 22 and a backing face 24 substantially at right angles to the flat face'22. This produces'the 'backing face 24 at substantially right angles to the outer face of the blade 18 and substantially parallel to the axis of theiblade'forthe seat face 22. The seat 20 preferably extends to and communicates with the outer edge of the blade .18 but is spaced from but in proximity to therear edge of the blade '18 so that a trapezoidal blade 26*having a longcutting edge 28 and a short back edge 30 together with converging ends '32 and34:may-be mounted with'the back 30 in contact with the backing face 24 andeither end 32 or 34 on a converging end face36.

A cover plate 40 having a back edge42 is in-contact with the backing .face.24 and a diagonally extending edge 44 is in contact with the end face 36.

The blade 18 is provided with a threaded aperture 46 for receiving a screw-threaded fastener 48. The guard plate 40 is provided with a semi-aperture 50 having an inwardly beveled edge 52 for receiving the outwardly beveled head 54 of the screw fastener 48. As clearly shown in Figure l the threaded aperture 46 is substantially bi-sected by the backing face 24 and the blade 26 is provided with a semi-aperture 56 which may be provided wtih semi-threads 58. The device is assembled with the blade 26 in contact with the faces 22 and 24 and the guard plate 40 is placed in overlying position and the screw 48 is firmly attached in the opening 46 so that the blade 26 is held in position and then clamped therein by means of the overlying guard 40. The short or back edge 30 of the blade 26 is in contact with the backing face 24 of the plate recess so that a corner of the blade 26 extends outwardly from the outer side of the hatchet blade 18. The hatchet blade 18 is cut away at 60 and the guard plate 40 is cut away at 62 to expose a further portion of the edge of the blade 26.

In order to prevent injury to the major portion of the edge of the blade 26 and to prevent workmen or others from being cut by the exposed edge of the blade the guard plate 40 is extended beyond the outer edge of the blade 26 and has a turned over portion 66 which extends into proximity with the edge 28 so that the blade is protected from accidental contact with injurious surfaces or by contact with the operator.

The blade 26 is preferably an isosceles trapezoid so that it may be turned and either end of the edge 28 may be exposed in the cut-away portions 60 and 62 so that the blade has a substantial double-life in use.

In operation of the device, the blade 26 will be as.- sembled on the hatchet blade and will be available to the workman at any time the razor blade is needed. The blade 18 together with the guard 40 efficiently protects the blade from most injuries so that it will remain sharp and ready for use when needed. Likewise, the guard protects the blade so that there is little danger of injury to the workman or to material adjacent where the workman is operating. Since the cutter blade is mounted on the hatchet there will be no necessity of reaching for a dangerous blade when cutting operations are to be performed but 'the hatchet will be used by .merely reversing its position. It will thus be seen that the cutter blade will be available whenever needed and that there will be little danger of injury to the operator while using the same.

For purposes of illustration a particular embodiment of the invention has been shown and described according to the best present understanding thereof. It will be apa parent to those skilled in the art that changes and modifications may be made therein without departing from the true spirit of the invention.

Having'described the invention, what is claimed as new A cutting tool of the type comprising a handle and a head on one end portion thereof and at right angles thereto, said head having one face thereon tapering to a marginal edge, the forward end portion of said head being cut away and a recess in the opposite face of said head extending longitudinally from said forward end portion to a point in spaced relation to the rear end thereof and defining relatively angularly extending shoulders, a substantially trapezoidal blade removably mounted in the recess in edge-abutting engagement with the shoulders and including a tapered cutting edge extending beyond said marginal edge and projecting forwardly of said head, a polygonal guard plate removably mounted in the recess on the head and abutting the shoulders, said plate having a cut-away forward end portion flush with said cut-away portion of the head for exposing the forwardly projecting portion of the blade, said plate comprising an inwardly bent marginal flange paralleling the tapered cutting edge and closely adjacent thereto, said head having a threaded opening extending transversely therethrough in communication with the recess and intersecting one of the shoulders, said blade having a threaded marginal notch therein aligned with the opening, said plate having a tapered marginal notch therein aligned with the opening, and a screw threadedly mounted in the opening and the first-named notch and including a conical head engaged in the second-named notch for clamping the blade and the plate in the recess.

References Cited in the file of this patent UNITED STATES PATENTS 821,525 Nordquist May 22, 1906 1,038,896 Jolly Mar. 15, 1948 1,424,433 Angeletti Aug. 1, 1922 1,814,596 Hamel July 14, 1931 1,940,270 Rainwater Dec. 19, 1933 2,304,771 Davis Dec. 8, 1942 2,437,896 Rutledge Mar. 15, 1948 2,499,345 Adams Mar. 7, 1950 2,500,629 Crookston Mar. 14, 1950 2,686,968 Alrnlof Aug. 24, 1954 FOREIGN PATENTS 47,641 Sweden July 18; 1918 431,737

Germany July 20, 1926

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US821525 *Jul 19, 1905May 22, 1906Andrew O NordquistFloor-scraper.
US1038896 *May 23, 1911Sep 17, 1912Rowland W JollyCutting device.
US1424433 *Oct 10, 1919Aug 1, 1922 angeletti
US1814596 *Mar 19, 1928Jul 14, 1931Hamel Otto WKnife
US1940270 *Jun 15, 1931Dec 19, 1933Bertram A RainwaterCutting device
US2304771 *Apr 16, 1941Dec 8, 1942Ascote IncCutter
US2437896 *Dec 29, 1944Mar 16, 1948Jesse Rutledge MarcusSliding wallpaper base trimmer
US2499345 *Jan 3, 1946Mar 7, 1950Joseph Adams EppsAxe with detachable blade
US2500629 *Jan 3, 1947Mar 14, 1950Anthony J CrookstonShingling and rock lathing tool
US2686968 *Feb 20, 1950Aug 24, 1954Harald Almlof JohnWindow cleaner
DE431737C *Dec 11, 1924Jul 20, 1926Wilhelm SchreiberSicherheitsrasiermesser
SE47641A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2895217 *Feb 28, 1957Jul 21, 1959Fisher Arthur FScraper
US3257671 *Jul 29, 1964Jun 28, 1966Crookston James RShingling tool with adjustable guide
US4813141 *Jun 18, 1987Mar 21, 1989The Perfectrim Limited PartnershipCarpet seam cutter
US6029355 *Aug 27, 1997Feb 29, 2000Kejr Engineering, Inc.Device for cutting soil sampling tubing
US6047427 *Jul 27, 1998Apr 11, 2000Whitlock, Jr.; Vernon J.Retractable blade hatchet
US8257148 *Jan 6, 2009Sep 4, 2012Reliance Controls CorporationKnife insert with bottom edge relief for cutting edge alignment
U.S. Classification30/286, 30/123, 7/145, 30/308.3, 30/294, 30/337
International ClassificationB26B23/00
Cooperative ClassificationB26B23/00
European ClassificationB26B23/00