US 1629667 A
Description (OCR text may contain errors)
1,629,667 y 1927- J, D. KNIPPLE METAL CUTTING TOOL Filed Oct. 15, 1926 Inventor:
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ag MM 64% War/MK Patented May 24, 1927,.
UNITED ,STATES PATENT OFFICE METAL-CUTTING roon.
Application filed October 15, 1926. Serial No. 141,751. g
This invention relates to metal cutting tools and while not limited thereto, relates more particularly to tools for use in heavy duty planers such as are used in planing railway frogs, crossovers and other heavy steel structures.
In the commercial production of railway track structures such as frogs, crossovers, and the like, it is necessary to form certain parts by planing operations and, in order to reduce the cost of these operations to a minimum, heavy duty planing machines have been develo ed capab e of making deep cuts by using a igh grade of special highspeed tool steel tools.
Heretofore the high-speed tool steel tools for use in these machines have consisted of a standard steel holder with a high-speed tool steel cutter or bit welded thereto, and when the cutting edge of the cutter or bit was worn down, due to continual sharpening, the entire tool had to be discarded, resulting in the loss of the tool-holder and the. remaining portion of the high-speed tool steel bit.
The present invention provides a tool composed of a tool or bit holder having a delnountable high-speed tool steel cutter or' bit which may be replaced when worn, and the worn bit may be reused in tools having shorter heads, thereby entirely reducing the loss resulting from discarding the tool-holders and materially reducing the loss resulting from the discarding of .the worn bits or cutters.
In the drawings- Figure 1 is a side elevation of a tool constructed in accordance with this invention.
' Figure 2 is a plan view of the bit supporting head of the tool holder.
Figure 3 is a similar view with the tool bit removed.
Figure 4 is a perspective View of the tool bit.
Figure 5 is a perspective view of the head end of the tool holder.
Referring more articularly to the drawings, the letter A esignates the tool-holder as a whole, which supports a cutter-or bit B.
The tool-holder A comprises a squared shank portion 2 terminating at its lower end in an enlarged bit supporting head 3. The head 3 has its forward face recessed from its lower end upwardly and inwardly forming a cutter or bit seat 4. The rear wall of the seat 4 is provided with a slot 5 extendin axis 0 the tool and the top wal of said seat is undercut toprovide an overhanging beveled retaining flange 6.-
The high-speed tool steel bit B is mounted in the seat 4 and comprises a bod ortion 7 having its upper end face beve e as at 8, so as to PI'OJQCt and engage underthe retaining flan 'e 6. The rear face of the bit B is provided with a, transversely extending supporting rib 9 adapted to extend into the slot 5, and serves to prevent twisting of the bit under heavy duty. The lower end of the bit B is cut away to form a pr jecting cutting nose 10, and the lower end of the head 3 of the holder A is provided with a centrally disposed rib 12 adapted to engage the bit and reinforce and support the nose 10.
A bolt 13 is passed through the head 3 and the bit B and provided with, a nut 14 for locking the bit B in position and preventing displacement. thereof.
In use the bits B may be sharpened by grinding without removing them from the holders A, as is usual until their cutting edges are cut down too close to'the holders. After the bits B have their cuttin edges ground down too close to the hol ers A, the bits are removed and new bits substituted therefor. i
The bits removed from the holders as above described, may then be fitted to new holders having shorter heads 3 so as to again expose their cutting edges and permit their use, or such bits maybe mounted in lighter and smaller tool holders for use in other machines as desired, so that the maximum amount of the high-speed tool steel bits may be utilized before they need be discarded.
at right angles to the lon itudinal While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited thereto since various modifications may be made without departing from the scope of my invention as defined in the appended claims.
I claim- 1. A tool of the class described, comprising a shank, an enlarged cutter supporting head formed integral with the. lower end of said shank, said head having its forward face recessed from its lower end upwardly and inwardly to form a cutter, bitsea't, the rear wall of said seat being provided with a slot extending at right angles to the longitudinal axis of the tool and the top wall of said seat being undercut to provide an overhanging retaining flange, and a high-speed tool steel cutter bit mounted in, said cutter seat, said bit having its upper end beveled so as to project andengage under said retaining flange, a supporting rib projecting from the rear face of said bit and engaged in said slot in the rear wall of said seat, and means for locking said bit against displacement relative to said seat.
2. A tool of the class described, comprising a shank, an enlarged cutter supporting head formed integral with the lower end of said shank, said head having its forward face recessed from its lower end upwardly and inwardly to form a cutter bit seat, the rear wall of said seat being provided with a slot extending at right angles to the longitudinal axis of the tool and the top wall of said seat being undercut to provide an overhanging retainin flange, and a high-speed tool steel cutter it mounted in said cutter seat, said bit havin its upper end beveled so as to roject and engage under said retaining ange and its lower end cut awa to form a cutting nose, a supporting ri projecting from the rear face of said bit andengaged in said slot in the rear wall of said seat, a bolt passing through said cutter supporting head and saidbit to lock said bit against displacement, and means formed integral with the lower end of said head for supporting said cutting nose.
In testimony whereof, I have hereunto signed my name.
JAMES D. KNIPPLE.