US1049589A - Fastening means for planer-heads. - Google Patents

Description

H. J. MITCHELL.

FASTEN MEANS FOR PLANER HEADS.

APP I TION FILED DBO.14,1908.

1,049,589. 7 PatentedJanflL lQB.

"*lates more particularly". to improved and .receive and accommodate the bases of the .pnri ap stlmtrss orrioni HARRISON J. MITCHELL/F BEnoInwIsooNsIN, .essIGNoR 'ro THE, BERLiN'MAc IivE,

:WOBKS, or VBELOIT, WISCONSIN, A CORPORATION OF wIsooNsIN. j g

' Beit known that I, HARRISON 1J. MIT ELL, a citizen of the UnitedjS-t-ates, residingat FASTENING MEANS FOR PLANER-I-IEADS.

i I Specification of Letters Patent.

. Application fiIed DecemibeI '14,19os.' Serial No. 4 7,417.

To alt w/wm it may concern; 1

Beloit, in the county ofltock and State of Wisconsin, have invented certainnew and useful Improvements in Fastening. Means i I for Planer-Heads and the Like, of which the following is aspecification."

This invention pertains to nnprovement-s in the heads or cylinders of planers, and re- I novel [means for fixedly holdi'ngand securing beading knives or the like in place. Each of such knives has. a base,- preferably of dovetail or similar conformation, adapted to fit in acorrespondingly-shaped or undercut groove or slot on the planer cylinder surface, the bases of the beading knives beforce them into such position or relation. f

' ing heldinfirm engagement with the walls of such grooves by suitablemeans which will In my preferred embodiment, of the invention the bases of thefknives are made so as to be capable of expansion, and I employ expanding means such as tapered screws to ..,enla-rge the bases and cause them to press 'firmly against the undercut s1des of the groove.

In the accompanying drawing, which forms a part of this specification, I have illustrated a preferred embodiment ofv the invention, and in these drawings-Figure 1 made apparent that the planer head or cylis a fragmentary perspective view of a planer cylinder equipped with the invent-ion,-the cylinderalso having an lmproved inder 11, only a portion-of which is shown in any of the figures, has extended across its cylindrical face or periphery one or more dovetail or (undercut grooves 12 adapted to A preferred embodiment of the invention is shown inFigs. 1, 2 and 3, in which the heading knife 16 hasa base 17 shaped to fit within the groove 12 beneath the overhanging wallsl l and 15, which base is of'sub- Patented Jan. 7,1913.

st-antially no'greater width thanthe knife I itselfgand. is vertically divided or slotted at; 18, as shown, and also equipped with a' tapered screw hole intersected by. this slot or out, this hole being intended to BCCOIHIIIQ? 1 date a tapered tightening screw 19Z As is obvious, the turning of this screw so as to force it =-inwardly will enlarge the' base,

V spreading its two portions apart so that they 7 will firmly and securely p-ress.againstw.the

walls of the groove, thereby holdinglthe knife in fixed operative position. ,The

taperedscrew hole is made somewhat inclined to, the plane of the 'bottom of the groove so as to facilitate the turning of the I screw by a screw-driver of the ordinary characten and to avoid the necessity of a In the embodilaterally "extending base. ment illustrated one portion of the base is pressed rearwardly into the back part of the groove, while the other portion is forced forwardly beneath the front wall of the groove, so thatin each instance the knifeis securelyheld from moving out of its cor-- rect operative position. Such beading knives are frequently used on a planer cylinder also equipped withstraight-edge planing knives,

and in order that the latter may be prop); e

erly jointed'during the rotation of the cylin der or head, it is necessary to take out the beading-knives, and of course they should be replacedin exactly the same positions I which they'previously occupied. To facilitatethis replacement the undercut or dovetail grooves may be supplied with oneor' more stop or abutment blocks also shaped to 1 conform substantiallyto the cross-section of the groove. One form of such block is shown in Fig. 1 at 21. As'is clearly illus- .trated, this block is provided with arsulo- .stantially central threaded hole extended 1 therethrough which receives. a tightening screw 22-bearing against the bottom face of 1:

the groove and forcing theblock-upwa-rdly so that 'its inclined sidesare brought into 1 ment. After one or more ofgthese stop or abutment blocks have beeniproperly posifirmengagement with the-inclined side walls of the undercut groove, the frictionbetween the parts being sufliclent toprevent dislodg- .tioned and tightened in the groovesythe knives coiiperating therewith maybe readily taken out and replaced without difficulty in exactly the same positions which they previously occupied.

To those skilled in the art it will be readily understood that the beading knives and stops are to be grouped in the holding grooves in conformity to the form and style of beading to be produced on the boards or lumber, and in the drawing of this application I have not attempted to show any such arrangement of knives, but have merely indicated in Fig. 1 a plurality of such knives.

The various features of detail herein shown and described may be changed and modified within wide limits without departure from the substance and essence of my invention, and without the sacrifice of any of its benefits and advantages.

I claim 1. The combination of a planer cylinder having an undercut groove on its outer surface, a knife having a dovetail base adapted to fit in said groove, said base having a threaded hole disposed transversely of the cutting edge of said knife, and inclined to the bottom of said groove, said base having also a slot dividing the base and intersecting said threaded hole in the plane of its axis, and

a tapered screw threaded into said hole to spread the slotted base of the knife and force the beveled edges thereof against the Walls of said groove to securely hold the knife in operative posit-ion, substantially as described.

2. The combination of a planer cylinder having a longitudinally extending undercut groove on its periphery, a planer knife having a dovetail base of substantially the same width as the body of the knife and adapted to fit in said groove, said base having a tapering screw-threaded hole extending therethrough longitudinally of the undercut groove and inclined to the bottom of said groove and having also a slot'intersecting said hole and dividing the base, and a tapered screw threaded into said ho-leto force the sides of the base apart, whereby the beveled edges thereof are forced into engagement with the undercut walls of the groove to securely hold the knife in operative position, substantially as described.

HARRISON J. MITCHELL.

\Vitnesses U. G. PERKINS, L. M. RANDALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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