US2578516A

US2578516A - Work guide for woodworking machines and the like

Info

Publication number: US2578516A
Application number: US157395A
Authority: US
Inventors: Cecil F Crow
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-04-21
Filing date: 1950-04-21
Publication date: 1951-12-11
Anticipated expiration: 1968-12-11

Description

C. F. CROW Dec. 11, 1951 WORK GUIDE FOR WOODWORKING MACHINES AND THE LIKE 2 SHEETS-SHEET 1 Filed April 21, 1950 INVENTOR. Cecz'ZfiCraw WORK GUIDE FOR WOODWORKING MACHINES AND THE LIKE C. F. c ow Dec. 11, 1951 2 SHEETS-SHEET 2 Filed April 21, 1950 ways.

Patented Dec. 11,1951

f WORK GUIDE FOR WOODWORKING MACHINES AND THE LIKE Cecil F. drowg Klamath Falls, Oreg.

. Application April 21, 1950, Serial No. 157,395

This invention relates to woodworking machinery and has special reference to a lumber guide for such machinery.

In such machines as molding. machines and circular saws, it is customary to provide ,the-

machine with a bed wherethrough a cutting tool projects. Usually a guide is positioned on the head in adjustable relation to the cutting tool. This guide is adjustable bodily toward andfrom the cutting tool so as to accommodate different widths of lumber used in the production of strips having one or more molded edges varying slightly in width, and in the cutting operation the guide should rest against one edge of the lumber and urge it into position against a straight edge. In such machines rolls are provided to draw the lumber forward after it is positioned against the straight edge. It a board reaches the rolls before the guide has directed it against the straight edge, it will not be properly edged along its full length, no edging being effected for some distance along its enteringend. Such an unedged end has to be cut off before the lumber can be marketed and about two feet in the length of the board will be scrapped. I

One important object of this invention is to provide an improved construction of lumber guide which will, after once being set, open and close on any width of lumber for which'the guide has been set. a I

A further important object of this invention is to providea novel form of spring guide for holding lumber firmly against the straight edge of the machine to which the guideis applied.

Another object of the present invention is to provide a novel form of lumberguide having a leaf spring againstwhich the lumber engages, the spring being so mounted that it may swing bodily about a pivot point.

A still further object of the invention is to provide a novel form of lumber guide having a leaf spring guiding member anchored at one end and having its other end provided with means for reinforcing its spring action.

With the above and other objects in view, as

will be presently apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully de- Claims. (Cl. 144253) scribed, illustrated in the accompanying drawings, and particularly claimed.

In the drawings, like characters of reference indicate like parts in the several views, and

section, of the invention and a portion of the bed of the machine to which it is applied; and

'- Figure 3 is a section on the line 3-3 of Figure For the purpose of illustrating the application of this guide to a woodworking machine, there has been shown in the drawings a portion of such a machine having a bed It) on which is mounted a straight edge member I I leading to a feed roller device part of which is shown at 12. Also, a piece of lumber B is shown which is held pressed down on the bed ID by suitable means such as is shown at [3. In the bed [0 is provided a transversely extending slot I 4 for purposes presently to be understood.

{The guide forming this invention includes a base plate IS on one end portion of which rests a head 16. A pivot bolt I! passes through the head l6 and base plate I5. The lower end of the'bolt' ll passes through the slot l4 and is there secured by a nut l8. An elongated slot I9 extends vertically through the head and is provided at one end with a recess 20. Through the recess 20, the plate I5 and the slot l4 extends a bolt 2i having a nut 22 on its lower end. This bolt 2| fits closely in the plate I5. Thus, by means of the bolts I1 and 2|, the plate [5 may be adjusted along the slot is while beingheld against rocking on the pivot bolt II. In the slot lli'is held'a coiled compression spring 23 one end of which seats against the bolt 2| while the'other end seats against the end of the slot l9 remote from the recess 20. This spring thus urges the head 16 in a clockwise direction of Figure 2, the bolt 2| constituting a limit stop for this movement by seating in the inner end of 'the recess 25; A' cover i9 is provided for said slot l9 and recess 20.

One end of a leaf spring 24 is secured fixedly to the side of the head l6 adjacent the straight edge H by means of bolts 25. This spring extends from the head to lie opposite the straight edge and adjacent the feed roller means l2. On the end of the base plate l5 adjacent the feed roll r means there is fixed a spring housing 26. Slidably mounted in and extending from the spring housing 26 is a rod 21. The housing 25 has an open end 28 into which the rod 21 extends to pass axially through the housing. At the other end of the housing is a head 29 having a central opening 38 through which the reduced and threaded end 3| of the rod 21 extends. Within the open end of the housing 26 the rod 21 is provided with a shoulder 32 facing thehead 29. A coiled compression spring 33 surrounds the rod 21 within the housing 26 and seats at one end of the shoulder 33, its other end seating against the head 29. A nut 34 and lock nut 35 are screwed on the threaded end 3| at the portion projecting from the housing 26. The spring 33 urges the rod outwardly of the housing but the outward movement of the rod 21 is limited by the nut 34.

In use, the base plate is adjusted on: the bed 10 in such position that lumber of a width averaging that for which the base plate is adjusted will engage the leaf spring between the head l6 and the position of rod 21.

nearer the head l6 and rock that head against the action of spring 23. lumber be somewhat under width, it will engage the leaf spring remote from its anchored end where it yields more readily to fiexure by reason of greater leverage. This condition will be compensated by the spring 33.

What is claimed is:

1. In a lumber guide for woodworking machines, a base plate, a head mounted on said base plate, a pivotbolt connecting the head. pivotally with the base plate, said head: having" a vertical slot therein one wall whereof is provided with. a vertical recess, a bolt extending through said recess and engaging in said base plate; a coiled compression spring in said slot between said last mentioned bolt and the wall of the slot opposite said recess, and a leaf spring having one end anchored to said head and extending freely therefrom.

2. In a lumber guide for woodworking machines, a base plate, a head mounted on said base plate, a pivot bolt connecting the head pivotally with the base plate, said head having a vertical slot therein one wall whereof is provided with a vertical recess, a bolt extending through said recess and engaging in said base plate, a coiled compression spring in said slot between said last mentioned bolt and the wall of the slot opposite If the lumber be some-- what over width, the engagement will take place If, on the contrary, the" said recess, a leaf spring having one end an-" 3. In a lumber guide for woodworking maa.

chines, a base plate, a head mounted on said base plate, a pivot bolt connecting the head pivotally with the base plate, said head having a vertical slot therein one wall whereof is provided with a vertical recess, a bolt extending through said recess and engaging in said base plate, a

coiled compression spring in said slot between said last mentioned bolt and the wall of the slot opposite said recess, a leaf spring having one end anchored to said head and extending freely therefrom, a spring housing fixed on the base plate and extending transversely thereof, said housing beingremote from said head substantially perpendicular to said leaf spring, a rod in said housing extending from the housing and engaging the adjacent face of the leaf spring, and a coiled compression spring in said housing surrounding the rod and urging it outwardly against said leaf spring to increase the resistance of the leaf spring against deflection.

4. In a lumber guide for woodworking machines, a base plate, a head mounted on said base plate, a pivot bolt connecting the head pivotally with the base plate, said head having a vertical slot therein, a bolt extending throughsaid slot at one end thereof and engaging in said base plate, a coiled compression spring in said slot between said last named bolt and the opposite end wall of the slot, and a leaf spring having one end anchored to said head and extending freely therefrom.

5. In a lumbergui'de for woodworking machines, a base plate, a head mounted on said base plate, api'vot" bolt connecting the head pivotally with the base: plate, said head having a vertical slot therein, a bolt extending through said slot at. one end thereof and engaging in said base plate, a coiled compression spring in said slot between said last named bolt and the opposite end wall of the slot, a leaf spring having one end anchored to said head and extending freely therefrom, and spring urged means carried on said base plate and engaging the free end portion of said leaf spring to reinforce its resistance to ilexure.

CECIL F. CROW.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 138,244 Gould Apr. 29, 1873 882,252 Knuth Mar. 1'7, 1908 1,022,176 Boothby Apr. 2, 1912 1,563,388 Mattison et al Dec. 1, 1925 1,788,663 De May Jan. 13, 1931 1,801,326 Boisvert Apr. 21, 1931 2,525,894 Graham Oct. 17, 1950 FOREIGN PATENTS Number Country Date,

633,378 France Jan. 27, 1928