US3220447A

US3220447A - Method of cutting with a convertible chip knife

Info

Publication number: US3220447A
Application number: US277959A
Authority: US
Inventors: Justin J Marquez
Original assignee: Individual
Current assignee: Individual
Priority date: 1963-05-03
Filing date: 1963-05-03
Publication date: 1965-11-30
Anticipated expiration: 1982-11-30

Description

Nov. 30, 965

METHOD OF CUTTING WITH A CONVERTIBLE CHIP KNIFE Filed M 1963 J. J. MA QUEZ 2 Sheet heet 1 Justin J Marquez 1N VE NTOR' WW 35 2 mm? J- J. MARQUEZ 3,220,447

METHOD OF CUTTING WITH A CONVERTIBLE CHIP KNIFE Nov. 30, 1965 2 Sheets-Sheet 2 Filed May 5, 1965 United States Patent 3,220,447 METHOD OF CUTTING WITH A CONVERTIBLE CHIP KNIFE Justin J. Marquez, Crosby, Miss. (712 N. Haugh Ave., Picayune, Miss.) Filed May 3, 1963, Ser. No. 277,959 1 Claim. (Cl. 144-309) The present invention generally relates to a knife construction for use in a wood chipping machine and more particularly to a convertible chipping knife which may be used as a counter knife in the wood chipping machine after the knife has been worn beyond use as a chipping knife thereby saving the normal cost of the counter knife.

The present convertible chipping knife is particularly constructed for use with a Hansel wood chip machine and includes novel structural features which enables the chip ping knife to be employed in the normal manner as a chipping knife and after it has become worn beyond use as a chipping knife, it then is converted into a counter knife whereby the normal costs of counter knives will be eliminated thereby reducing the overall cost of producing wood chips with the Hansel wood chip machine.

Another object of the present invention is to provide a method of cutting with a convertible chipping knife which is modified as to its structure for receiving supporting fasteners or the like prior to its being hardened thereby enabling the chipping knife to be converted to use as a counter knife after the chipping knife has been worn or used until it no longer is effective as a chipping knife.

A further object of the present invention is to provide a method of cutting with a convertible chipping knife which is simple in construction, easy to use effective for its particular purposes and relatively inexpensive to manufacture while at the same time saving the cost of the counter knives normally required during operation of the wood chipping machine.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a fragmental sectional view of a Hansel wood chip machine illustrating the mounting of the chipping knife and counter knife therein;

FIGURE 2 is a plan view of the chipping knife of the present invention;

FIGURE 3 is an edge view of the construction of FIG- UREZ;

FIGURE 4 is a detailed view of one end portion of the knife;

FIGURE 5 is a detailed sectional view taken substantially upon a plane passing along section line 55 of FIGURE 4 illustrating the countersunk aperture for receiving fastener screws;

FIGURE 6 is a fragmental plan view illustrating another form of the invention;

FIGURE 7 is a detailed sectional view taken substantially upon a plane passing along section line 7--7 of FIGURE 6 illustrating further structural details of this form of the invention.

Referring now specifically to the drawing-s, the numeral 10 generally designates the convertible chipping knife of the present invention which is specifically adapted for use in combination with a Hansel wood chip machine having portions thereof fragmentally illustrated in FIGURE 1 and generally designated by numeral 12. The chipping knife 10 of the present invention requires no modification whatsoever of the Hansel wood chip machine 12 and only those details sufiicient to describe the function and operation of the present invention, insofar as the wood chip machine 12 is concerned, are illustrated in FIGURE 1.

The wood chipping machine 12 constructed by Hansel Engineering Company includes a chipping knife which may be the chipping knife 10 of the present invention but conventionally employs a conventional chipping knife. Overlying the chipping knife is a counter knife 14 which is associated with the chipping knife 10 in a conventional manner in that the chipping knife 10 includes a beveled edge 16 in one direction while the counter knife 14 includes a beveled edge 18 extending in the opposite direction with the beveled edge 18 being disposed inwardly of the beveled edge 16. A retaining screw 20 is provided for the counter knife 14 and it will be appreciated that a plurality of such retaining screws are provided along the length of the counter knife 14 and the counter knife retaining screws 20 are threaded into a counter knife holder 22 attached to the disk 24 by a suitable fastening bolt or bolts 26. As will be understood, the rotatable disk 24 is provided with relief openings 28 for enabling discharge of the wood chips formed by the chipping knife 10. The chipping knife 10 is held in position by a knife clamp 30 retained in position by a knife clamp bolt or stud 32 having a clamping nut 34 thereon. A locking screw 36 is provided for the clamping stud 32 whereby the knife clamp 30 is secured to the stud 32 and the stud 32 serves to retain the clamp 30 in clamping relation to the chipping knife 10 to. enable clamping adjustment thereof. The remainder of the structure is conventional and includes a bed knife assembly generally designated by numeral 38. However, insofar as the present invention is concerned, the structure of the chipping knife 10 and counter knife 14 is significant.

The chipping knife 10 normally provided includes an elongated blade-like member 40 having a plurality of generally U-shaped notches 42 in the edge thereof opposite to the beveled edge 16. Disposed in the side edge of the blade or plate 40 is a plurality of sockets 44 which are internally threaded. conventionally, the chipper knife is approximately 4" wide when in its new condition and 18" long. The notches are 1%" in width and 1% in depth and are located on centers of 4 /8" and orientated 2 ,4 inwardly from the end edges. The threaded sockets 44 are A" in diameter, A" in depth and orientated 3 /2" inwardly from each end thereof.

The counter knife 14 is, of course, also 18" in length and includes a plate or blade-like member that is 2%" in width and provided with four holes extending therethrough on 4%" centers with the end holes being disposed 2 5 from the ends and /2 inwardly from the inner edge there of. The holes are in diameter and have a counterbore of /2" diameter and A" deep. These holes are designated by numeral 46 and the counterbore is designated by numeral 48. As described, the chipping knife and counter knife are supplied as two separate and individual components by the Hansel Engineering Company and the present invention incorporates the features of both the chipping knife and counter knife by providing the notches 42, threaded sockets 44 and holes 46 in one composite structure. The holes are the same size but are orientated on 4 /2" centers with the end holes being located 4 /2" from the ends. The overall dimensions of the convertible chipping blade 10 remains the same as a conventional chipping blade and the orientation of the notches 42 and threaded sockets 44 remain the same. In the convertible chipping knife 10, the holes 46 are orientated on 4 /2" centers with the end holes spaced 4 /2" from the ends of the knife 10 as compared with the conventional orientation in which the holes in the counter knife are disposed 4 /6" on centers and orientated with the end holes 2 ,46 from the ends of the knife. Thus, the convertible chipping knife, having the same dimensions as the chipping knife presently available is substituted therefor and the counter knife is formed from the chipping knife after the chipping knife has become worn beyond use as a chipping knife wherein the convertible chipping knife 10 is merely then inverted and the fastening screws inserted through the holes 46 which are counterbored from the bottom surface thereof as compared with the knife 10 when used as a chipping knife. The orientation of the counterbore 48 is illustrated in FIGURE 5.

As illustrated in FIGURES 6 and 7, the convertible chipping knife 50 is provided with notches 52 in the side edges thereof and also notches, 54 in the rear edge orientated in the same manner as the holes 46 and being countersunk or counterbored as at 56 in the same manner for receiving the fastening bolts for the counter knife. This enables the convertible. knife to be employed with different type knife holders and clamps for properly orientating and securing the chipping knife in position.

The grooving or drilling as well as the slotting of the convertible chipping knife is done in the process of manufacturing and prior to their hardening by a heat treating process thereby enabling the chipping knife to be successfully altered after it has been Worn out so that it can then be used as a counter knife. It is appreciated that a number of the chipper knives and counter knives are used in each machine and currently, the counter knives cost approximately $22.00 and by enabling the chipping knives to be used as counter knives after they have been worn out as chipping knives, it will be appreciated that this effects a considerable saving in the operation and maintenance of the wood chipping machine. Additionally, the steel used in the chipping knife is of a better grade than that normally used in the counter knife and actually the reused or convertible chipping knife will wear for a longer length of time than the conventional counter knife. The knife holder for the counter knife may have to be drilled by the machine owner to fit the pattern of the holes in the modified or convertible chipping knife or there is also a possibility that special knife holders may be obtained from the manufacturer thus requiring no alteration whatsoever of the machine.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired' to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

The method of providing a counter knife from a worn chipping knife used in an assembly of chipping and counter knives having their bevels extending in opposite directions, said method consisting of the steps of providing an elongated blade, forming first chipping knife retaining openings in said blade, forming second counter knife retaining openings in said blade separate from said first openings, sharpening one edge of said blade, hardening the blade, mounting the blade by'use of said first openings and using the blade, with a counter knife, as a chipping knife until worn beyond useful size as a chipping knife, sharpening the Worn blade, and, when said counter knife has worn beyond useful limits, inverting the blade, mounting the blade by use of said second openings, and using the blade as a counter knife.

References Cited by the Examiner UNITED STATES PATENTS 2,570,845 10/1951 Ottersland 144-176 2,728,366 12/1955 Woodcll 144-229 2,796,094 6/1957 Himmelheber et a1. 144-476 3,000,578 9/1961 Riches et al. 24192 3,030,987 4/1962 Jackson et a1. 144-176 ROBERT C. RIORDON, Primary Examiner.

WILLIAM W. DYER, LESTER M. SWINGLE,

Examiners.