US1035735A - Circular-saw guard. - Google Patents

Description

R. H. POGUE.

OIROULAR SAW GUARD.

APPLICATION FILED NOV. 22, 1910 Patented Aug. 13, 1912.

ROBERT H. POGUE, OF NEW WESTMINSTER, BRITISH COLUMBIA, CANADA.

CIRCULAR-SAW GUARD.

Specification of Letters Patent.

Patented An". 13, 1912.

Application filed November 22, 1910. Serial No. 593,680.

To all whom it may concern Be it known that I, ROBERT H. POGUE, a citizen of the United States, residing at New Westminster, in the Province of British Columbia and Dominion of Canada, have invented new and useful Improvements in Circular-Saw Guards, of which the following is a specification.

The present invention provides novel means for insuring safety to the operator of circular saws in lumber mills and at the same time providing a device for spreading the lumber upon each side of the kerf and providing means for preventing the mate rial being drawn backward by the saw when the latter is in operation.

The invention contemplates a novel structure for attaining the objects stated and which may be secured to the table of the machine and thereby overcome the objections incident to attaching guards to overhead structures.

The invention consists of the novel features, details of construction and combination of parts, which hereinafter will be more particularly set forth, illustrated in the accompanying drawing, and pointed out in the appended claim.

Referring to the drawing, forming a part of the application, Figure 1 is a perspective view of a circular saw guard embodying the invention. Fig. 2 is a horizontal section of the guard on the line y-y of Fig. 1. Fig. 3 is a vertical transverse section on the line m-m of Fig. 1. Fig. 41 is a central longitudinal section of the guard, showing the block at its lowest position with reference to the casing. Fig. 5 is a view similar to Fig. 4, showing the forward end of the block riding upon the lumber.

Corresponding and like parts are referred to in the following description, and indicated in all the views of the drawing, by the same reference characters.

The guard comprises a hollow body presenting the form of a semicircular casing and comprising side pieces 1 and a top 2 closing the space formed between the curved edges of the side pieces and secured thereto in any manner. A wooden block 3 is located within the lower or open side of the hollow body and closes the same. A saw cut 4 is formed in the wooden block 3 to receive the portion of the saw to be inclosed so as to protect the operator from injury. The wooden block 3 constitutes a guide and prevents lateral vibration of the circular saw and at the same time prevents injury to the saw such as would result if any metal part of the guard were permitted to come in contact with the saw teeth. The wooden block 3 1s renewable so as to be easily replaced when worn.

The parts 1 and 2 may be of sheet metal such as galvanized iron or steel and these parts are prefer-am! connected by means of ties 5, which consist of short pieces of stout wire which are passed through openings formed in the side pieces 1 near their curved edges, the ends of such wires being bent over edge portions of the top 2, the latter being supported by the wires which extend along the inner side of the part 2. Wings 6 are formed upon the side pieces opposite the openings through which the ties pass so as to strengthen the portions receiving the bent ends of the ties and prevent their pulling through the openings. The wings 6 are bent inward and overlap edge portions of the top 2 and supplement the bent ends of the ties 5 in connecting the parts.

Strips 7 extend along the outer sides of the parts 1 and are secured thereto and to the wooden block 3. The rear ends of the strips 7 project beyond the body of the guard and are brought together so as to embrace opposite sides of a standard 8 to which the guard is secured. A clamp screw 9 connects the projecting end portions of the strips 7 and draws the same together to clamp the standard 8. thereby holding the guard in an adjusted position. The strips 7 reinforce the lower portions of the side pieces 1 of the guard and also provide means for connecting the guard to the standard 8. The strips 7 preferably consist of parts of a strap which is folded upon itself, the end portions of the strap embracing the guard and being secured thereto, whereas the folded portion embraces the rear edge and opposite sides of the standard S.

A. dog 10 is pivotally connected to the rear portion of the reinforcing strips and its rear portion is toothed to engage the lumber and prevent the saw from drawing the work backward. The'dog 10 is formed of a bar or strip which is doubled upon itself so as to embrace the rear edge and opposite sides of the standard, the side members of the folded portions being pivotally connected to the reinforcing strips 7 The rear portions of the member comprising the dog are curved and their lower edges are toothed. The dog 10 acts by gravity and its members engage the upper surface of the board or other work upon opposite sides of the standard 8.

The standard 8 alines with the saw cut- 4 and acts as a splitter to spread. the portions of the board upon opposite sides of the kert. The standard is secured to the saw table and for this purpose its lower end is formed with a foot which is apertured to receive the tastenings by means of which the standard is secured to the table. By having the standard secured directly to the saw table and forming a support for the guard the structure caused to possess stability and is not liable to vibrate because of the short connection between the table and the point of contact of the guard therewith.

From the foregoing description, taken in bolts connecting the side pieces of the casing near their lower edges and ends, and a connection with the accompanying drawing, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains, and while I have described the principle of operation of the invention, together with the device which 1 now consider to be the embodiment thereof, Idesire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the scope of the claim appended hereto. 7 v

The wooden block 3 is loosely mounted within the casing 1 so as to mov'e freely therein in a vertical direction so as to adapt itself to the thickness of the lumber passing beneath the guard and over the table, thereby preventing the scattering of sawdust. The bolts or fastenings 11 for retainingthe wooden block within the casing pass through slots 12 formed in end portions of the wooden block, as indicated most clearly in Figs. sand 5. The forward end of the wooden block is beveled, as indicated at 13, so as to ride upon the end of the board 1a or other lumber passing beneath the guard during the operation of sawing. Normally the wooden block extends a short distance below the casing so as to adapt itselt'to variations in the thickness of lumber within certaiii limits to maintain a close joint with the lumber and thereby prevent scattering of the sawdust. I

Havingthus described the invention what is claimed as new, is

A guard for circular saws comprisinga casing of approximately semicircular form,

x'vooden block of substantially semicircular outline loosely fitted witliinthe casing and having curved slots near opposite ends to receive the bolts which connect the sides of the casing and said wooden block being further provided with a mediallydisposed longitudinal saw cut to receive the upper portion of the circular saw to be protected.

In testimony whereof I afl iX my signature in presence of two witnesses.

ROBERT H. Pooun.

W'itnesses:

SAMUEL Pooon, ADAM S. JOHNSTON.

Copies of this patent may be obtained for five cents each, addressing the Commissioner of Patents, Washington, D. 03"

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