US973837A - Guard for woodworking-machines. - Google Patents

Description

A. F. W. ZASTBOW. GUARD ron woobwonma nomma.

nrmoulol nun :uns so, mo. .Y

Patlld 0G15. 25, 1910.

wi m l Zwgywfnvm Mfg-2A V vby Attorneys AUGUST F. W. ZASTROW, OF LYONS, VIOWA.

GUARD FOR WOODWORKING-MACHINES.

Speciiication of Letters Patent.

Patented Oct. 25, 1910.

Application led June '20, 1910. Serial No. 567,906.

To all whom tt may concern:

Be it known that I, AUGUST F. W. ZAE- TROW, a citizen of the United States, residing at Lyons, in the county of Clinton and State of Iowa, have invented a new'and 'useful Guard for Woodworking-Machines, of which the following is a specification.

This invention relates to improvements in guards for wood working machines having vertical cutter heads rislng romgthe table of the machine, and it is the object of the invent-ion to provide an improved guard to protect the fingers and hands of the operator against accidentally coming in ,contact with the blades of the cutter heads.

The invention also has for its object to provide a. guard which does not obstruct the vision of the operator, and which leaves the work in full view.

Another object of the invention is to provide a guard which can be readily placed in operative position, and removed when the work is finished.

The invention is illustrated in the accompanying drawing forming a part of this i specification, in which,

Figure 1 is an elevation of the guard and its support, the latter being shown partly in section. Fig. 2 is a horizontal section on the line 2-2 of Fig. 1.

In the drawing, 5 denotes the table of the machine, and 6 is one of the cutter heads rising therefrom, said head carrying blades 7 which operate on the work to be l shaped. The guard for the cutter head is in the form of a cage suitably dimensioned so that the cutter head may extend thereinto as shown in Fig. 1. The cage is cylindrical in form, and is composed of a series of spaced wires or rods 8 carried by aseries of vertically spaced rings which determine the outline of the cage. At the bottom of the cage I is a ring 9, and a suitable distance above the same is another ring 10having the same diameter as the ring 9. Above the ring 9 are rings 11- and 12 respectively, which are s aced apart, and of the same diameter, said diameter being less than the diameter of the rings 9 and 10. This arrangement of the rings makes the cage larger at its lower end than at its upper end.

The guard herein described is suspended from the ceiling of the workroom in which the machine is located. 0n said ceiling is mounted a plate 13 having a screw threaded opening into which screws a tube 14, said tube depending from the plate, and being of a suitable length. Within the tube is telescopically mounted a tubular rod 15, said rod entering the lower end of the tube. The rod 15 has a't its lower end a lateral bend 16,

which bent portion of the rod passes through an opening in a head 17 carried by the ring 12. A set screw 18 threaded through the head to enga e the part 16 passing therethrough, rigi ly secures theca e to 'the rod 15, the set screw being provide with a lock nut 19.

For the purpose of normally holding the guard elevated, there is fastened to the upper end of the rod 15, a steel band 20 which is secured to and wound on a spring roller 21 suitably mounted on the ceiling, or at any other convenient place overhead. The band 20 passes through the tube 14. Secured t0 the ceilin by bracket arms 22, is a guide collar 23, avin a central opening in which the rod 15 wor s. This guide collar also supports the lower end of the tube 14. Threaded sidewise into the collar 23 is a set screw 24, said setscrew being adapted to be screwed against that portion of the rod which is located within the central opening of the collar, and when thus screwed against the rod, it holds the same rigidly in position. The rod has a longitudinal groove 25 on the outside, into which the set screw is adapted to be screwed, whereby the rod is held against rotary movement. The lower end o the groove 25 opens into an annular groove 26.

In operation, the set screw 24 is operated to release the rod 15, and the same is then lowered suliciently so that the guard may be placed over the cutter head as shown in Fig. 1, after which the set screw is operated to lock the ard in this position. After the work is ished, and it is desired to remove the guard from the cutter head, the set screw 24 is operated to release the rod 15, whereupon the spring roller 21 through the band 20 pulls the said rod upwardly, and thus removes the guard from the cutter head. The bend 16 locates the guard outside the longitudinal axis of the rod 15, in View of which the guard can be swung to one side of the cutter head in case the space directly above the same is needed. The guard may be swung into this position b rotating the rod, the latter being elevate until the set screw 24 enters the groove 26, the set screw;7 being backed suiiiciently so as not 'to bind the rod and prevent its rotation.

The spring device provides immediate and convenient power for disposin of the guard when the Work is finished, an the construction allows quick adjustment of the guard when it is needed.

The uard is not in the Way when not .in use, ang it eifectually serves the purpose for which it is designed, complete protection being afforded, Without obstructing the view of the work. The guard is removable from the stem 15, and will be made in ditl'erent sizes, so that a guard of a proper size may be selected, and placed in position for use, in case different size blades or knives are applied tothe cutter head.

What is claimed is:

1. A guard for cutter heads comprising an open ca e surrounding said cutter head, and an over ead support for the cage, said support comprisin a stationary member, anda member carrie thereby and movable in the .direction of the cutter head, said movable member carrying the cage and having longitudinal and circumferential grooves therein, resilient means connected to the movable member for elevating the same, and means en .aging said grooves for locking said movable member in adjusted position.

2. A guard for cutter heads comprising an open cage surround' the same, and an overhead support for said cage, said slipport comprising a stationary tube, a rod telescoping in said tube, said rod carrying the cage and having longitudinal and circumferential grooves therein, resilient means connected to t-he rod for movin the same in a direction to remove the cage om the cutter head, and means. engaging said grooves for locking the rod.

3. A cutter head guard .comprising an open cage into which the cutter head eX- tends, and an overhead support for said cage, said support comprising a stationary member, and a member carried thereby and movable in the direction of the cutterhead, said movable member being rotatable on its longitudinal axis, and having a lateral bend to which the cage is connected, and means for locking the movable member.

4. A cutter head guard comprising an open cage into which the cutter head eX- tends, and an overhead support for the cage comprising a stationary tube, a rod -telescoping in said tube, and carrying the cage, a stationary guide collar 1n which the rod works, a set screw threaded through said collar to engage the rod, and resilient means connected to the rod for moving the same in a direction to remove the guard from the cutter head.

5. A cutter head guard comprising an open cage into which the cutter head extends, and a rotatable overhead support for the cage, said support having longitudinal and circumferentlal grooves and said cage being located outside the axis of rotation of said support, a collar surrounding said support, and a set screw in said collar and adapted -to engage either groove of the support.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

AUGUST F. W. ZASTROW.

Witnesses:

WILLIAM W. SCOTT, SAMUEL C. Sco'rr.

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