US1426625A - Guard for woodworking machines - Google Patents

Description

C YOUNG. GUARD FOR WOODWORKING MACHINES.

APPLICATION FILED MAY 2, I919.

Patented Aug. 22, 1922.

lvwwtoz GharlesYoung.

GUARD FOR 'WOOIDWORKING: IMACHINES.

Specifi cation of Le tters Patent.

Patented Avg. 2%, 1922,

Application filed "May 2, 1919. Serial No. 294,201.

T 0 all whom, it may concern Be it known that 1, CHARLES Youne, a 3.1 of the United States, residing at Indianapolis, in the county o'l M: "ion and State of Indiana, have invented cert in new and useful improvements in Guards tor /Voodwor ring Machines, of which the following is a specification.

My s. 'd invention relates to wood working machines, aarticularly to machines employing cutter-heads for shaping portions of frame work entering into the construction of such devices as automobile tops, etc. in such machines rotary cuttcr-head mounted on a vertical spindle which extends through the work table of the machine and the wood member to be shapedis manipulated by hand against the rapidly rotating cutter-head until the work is reduced to a finished form. 2

In such machines it is essential that the rotary cutter should be always available for instant use on bringing the work into contact therewith. Said rotary cutters, however, present elements of danger to the operator inasmuch as their cutting edges are unguarded and the hands of the operator are liable under many conditions to come in contact therewith.

The object of my said invention is to provide aguard for such cutter-heads, which will normally stand in front of the edge of the cutter at the point of operation but which will be forced back behind its edge when the work isbrought into position to be operated upon and which will again automatically return to cover the edge of the cutter as soon as the work is withdrawn, and thereby guard the operator against accidentfrom contact with said cutter-head, all as will hereinafter be more fully described and claimed.

Referring to the accompanying drawing, which is made a part hereof and on which similar reference characters indicate similar reference parts,

Figure 1 is a vertical section through a cutter-head of the type referred to illustrating my improved guard and means for attaching it thereto, and

Figure 2, a crosssection looking in the direction indicated by the arrows from the dotted line 2-2 in Figure 1.

In said drawings the portions marked A represent the work table of the machine and B the cutter-head spindle, both of which parts are, or may be, of any approved or desired construction, the spindle B being mounted in appropriate hearings and connected with suitable driving means (not shown), as is usual in this type of machine.

lilounted upon a shoulder 10 on spindle B is a disk 11 having a hub portion adjacent to the spindle, and mounted upon the end of said hub portion of disk 11 is'a disk in which are formed tangential grooves 13 in which the cutters 14 are mounted at their lower ends. At the upper end is a similar structure comprising a disk 15, and a disk 1.6 having grooves corresponding to the grooves in disk 12 in which the upper end of cutters 14; are mounted. A nut 17 is mounted on the screw-threaded upper end of the spindle and is adapted to clamp said disks and the cutters firmly between the shoulder 10 and said nut.

The disks 12 and 16 are formed recessed and have rings 18 mounted in said recesses with their outer faces flush with the faces of disks 16 and 12. Said rings 18 are held in position by rings 19 formed interiorly screw-threaded and adapted to turn onto screw-threaded portions of said disks 12 and 16. Ball races are formed between the opposite sides of said rings 18 and the adjacent taces of disks 12 and 16 and rings 19 in which ball bearings are mounted, as shown. By this means rings 18, one at the lower end of the cutter-head and the other at the upper end of the cutter-head, are adapted to move independently of the cutterhead structure.

To said rings 18 is secured a guard 20, in

the form of a semi-cylindrical member, by screws 21. A stop-pin 22 is mounted in the work table adjacent to the cutterhead and a horizontal hook or pin 23 is secured in the guard 21 in position so that when the pin and hook are in contact the forward edge of the guard will have passedover and in front of the cutting edge of the cutter 1d at the point 25 where the work is done.

In operation, the frame member to be shaped, or dressed, is taken by the operator in his hands, laid upon the work table A and pushed against the front edge of the guard 20 toward the edge of the knife 14: behind. said guard. The operation forces the guard backward uncovering the edge of the cutting knife and permitting the knife to operate freely upon the member. At each motion of the piece of wood, as the operator manipulates it back and forth, the guard oscillates on its bearings uncovering the edge of the cutter as the wood member is pushed toward the knife while the rotary motion of the cutter-head carries said guard forward overtheec ge of the knife instantly on the Work being removed from the cutting edge.

By this knife is'always and instantly available for use'in dressingor shaping the wood members but on the other hand is instantly covered to guard against accident when the work is removed. i

Having thus fully described my said invention, what I claim as new and desire to secure'by Letters Patent, is:

1. In combination, aworlr table, a vertical shaft, a cutter head on the shaft having blades extending down to the-level of the table, a segmental guard for the blades extending over their entire length, said guard being adapted to be moved out of protect 'ing position by frictional engagement of the work, and'movable into protecting position by the rotationof the shaft, substantially as set forth. I

the table, cutting means the cut-ting edge of the" 2. In combination, a work table, a vertical shaft collars fixed-to the shaft, the lower collar being beneath the upper surface of devices carried by said collars, a segmental guard also carried by said collars, and means to move it between the blades and the operators normal position, substantially as set forth.

3. In combination, a work table, a vertical shaft, collars fixed to the shaft, the lower collar being beneath the upper surface of the table, cutting'blades attached at their ends to the respective collars,'a segmentalguard extending from one collar to the-other, and

movable into guardingposition by rotation 1 ofthe shaft and into contact with the work forth.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana this 17th day of April, A. D. nineteenhundred and nineteen.

I CHARLES YOUNG. [Ls] Witnesses: I

E. W. BRADFORD, M. L. \SHULER.

another position by substantially as set

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