US1134217A - Cutting apparatus. - Google Patents

Description

.l. H. MUNRO.

CUTTING APPARATUS.

APPLICATION FILED 1AN.2. I909.

1, 1 34,2 17. Patented .Apr. 6, 1915,

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THE NORRIS PETERS ca, PHOTOLITHQ. WASHINGTON. D. C.

' TED STATES PATENT OFFICE.

JAMES H. MUNRO, OF NEWARK, NEW JERSEY, ASSIGNOR OE ONE-HALF TO JOH MILTON VAN DIR-DEN, OF NEWARK, NEW JERSEY.

CUTTING APPARATUS.

Application filed January 2, 1909.

To all whom it may concern:

Be it known that I, JAMES H. MUNRO, of Newark, New Jersey, have invented certain Improvements in Cutting Apparatus, of which the following description, in connection with the accompanying drawings, 1s a specification, like letters on the drawings designating like parts.

This invention relates to cutting apparatus, and is of special utility when embodied in apparatus for trimming to the desired size and shape the sheets or units of roofing material known as inlaid slate which usually are formed by cementing with an elastic cement such as asphalt a number of small squares of slate (slightly thicker than the slates used commercially on roofs) upon a backing of flexible material such as roofing paper, this composite material not being capable of treatment by the usual devices employed by slateroofers, on account of the tough paper, the brittle character of the slates,v and the tenacious quality of the cement. It will be understood however that I contemplate the use of my improvements in any field for which they are adapted by their nature.

An important object of my invention is to provide for a rapidly working device which can be placed in the hands of relatively unskilled workmen whether used on a roof to trim the individual units to fit in places re quiring unusual shapes, or whether to be used in the mill where the slates are manufactured, to trim the units to standard size, it being requisite in each instance that the cut edges of the slate, backing and binding layer of cement shall be sharply defined and clean as well as true, so as to make possible an exact fit when the units are laid with their out edges in abutting relation.

Another important object of my invention is to provide apparatus in which a plurality of such cutting members shall be arranged to cooperate for the trimming at a single stroke of the margins of one or more of these slate units.

The various features of my invention will be illustrated and described fully in the accompanying drawings and specification and pointed out in the claims.

In the drawings :Figure 1 is a view in vertical, transverse section, with parts shown in elevation, of aslate-cutter in a construction of which my improvements have been Specification of Letters Patent.

Patented Apr. 6, 1915.

Serial No. 470,386.

embodied; and Fig. 2 is a view in front elevation of the same; Fig. 3 illustrates in perspective cutting apparatus having a plurality of cutting devices respectively embodying my improvements.

In the embodiment of my invention. selected for illustration and description to enable ready and complete understanding of my improvements and referring first to Figs. 1 and 2, the part designated by the reference numeral 1 is a cutting member which may be of any suitable construction and materialto efiect the rapid and clean severance of such an article as the inlaid slate units to which I have already referred, composed of pieces of slate cemented with asphalt to a backing of roofing paper in the preferred form of such units. As one convenient form of the aforesaid cutting member I have shown a blade of saw steel, provided with teeth 2 along its forward edge, which may be formed in a convex curve in order to secure a desirable downward action of the edges of the teeth at every point of engagement with the article to be out which in the instance illustrated is an inlaid slate unit, bearing the reference numeral 3, this numeral designating the pieces of slate, while the reference numeral 4 designates the backing, and 5 the intervening layer of cement. Preferably a suitable support will be provided for rigidly supporting one or more of the inlaid-slate units and this may take any suitable form, as for example, that designated by the reference numeral 6 which is applied to the worktable proper, while 7 designates the upright walls of the box-like structure upon which the worktable is mounted.

I prefer to mount the pressure saw 1 pivotally upon the work-support as upon the bearing stud or arbor 8 at the rear of the worktable, which is shown in the instance illustrated as having a slot, the walls 9 of which serve as cooperating shear members, with the saw blade. being preferably faced with angle strips of metal 10 for that purpose. Reinforcing strips 11 may also be provided as indicated in Fig. 2, upon the vertical walls of the work-support.

The inlaid slate units are frequently made in rectangular form, either as boards approximately twice as long as their width, or as squares, and when the article to be trimmed has two of its marfer to provide the mill in which they are manufactured with ,apparatus for trimming at a single stroke two or more of these margins, and such apparatus may take any suitable form.

I ha e shown in Fig. 3, in perspective apparatus suitable for trimming a plurality of the edges of an inlaid slate unit or simi: lar article whether in the form of a square or a longer rectangle, and it will be understood that I describe the rectangular form merely as a convenient illustration 'of the capabilities of this feature of my invention.

In Fig. 3 two pressure saws 24 and 25, of the type described above with reference to Fig. 1, are shown as mounted at 26 pivotally upon the support 27, and, for con-v venience and rigidity in operation these saws may have cross connections at various points such as the stay-bar 28, and the cross handle 29, by which the operator may pull the saws down against any article placed upon the worktable 30 and extending over the saw slots 31 which I prefer to provide with shoes or straight edges 32 to cooperate with the saws 24 and 25.

In order to relieve the operator of the necessity of lifting the saws after each cutting stroke, and to hold the saws normally in position for actuation, I may provide suitable counter-weights 33, serving as one convenient form of means to hold the saws in upright inoperative position. I prefer to provide also suitable means to hold the articles to be trimmed upon the worktable firmly in adjusted position during the trimming operation, and any suitable form of such means may be provided; One convenient form of such means is shown at 34 1 in Fig. 3 as a flap or coverboard mounted pivotally near its rear edge on bearing studs or shafts 35 journaledin lugs 36, so that the board may be swung down on top of the article to be trimmed or may be swung upward and away from said article.

In operation, the article having been placed upon the worktable 30, which is preferably deep enough transversely to receive two squares in tandem relation to the op erator who stands in front of the saws, the flap 34: will be brought down on top of the articles and will preferably be held there by suitable retaining means as for example, the spring latch 37, while the operator grasps the handle bar 29 and actuates the Copies of this patent may be obtained for five cents each, by addressing-the Washington, D. G.

' upon said work table.

pressure saws as already described. The operator may then raise the saws and the flap '34, either in the order named orsimultanethe way of the operator, the latch engaging the bar 2-8 for this purpose, in the instance illustrated. Having described my'invention thus full and suitable means for carrying same into. effect, it will be understood that I do not limit myself to the specific construction and materials illustrated and described, nor in general otherwise than asset forth in' the claims read in connection with this specification. V 7

What I claim as.new,-and desire to secure by Letters Patent is z 1. Cutting apparatus; comprising a work table; and an extended saw blade having near one end a fulcrum mounted on said table, said blade presenting a serrated edge of radius shorter-than the length of the blade for acute sawing relation in every position of operative engagement progressively with said work as the latter lies stationary 2. Cutting apparatus; comprisinga support forthe article to be cut; and a plurality of crescent saws of radius shorter than their length respectively, and spaced apart to engage and saw said article to a predetermined shape; said saws each having near one end a fulcrum mounted on said support; substantially as described. I

3. Cutting apparatus; comprising a support for a flat slate or similar article to be out; two crescent'shaped saws spaced widely apart and arranged in parallelism to engage said article and square thesame; a pivoted clamping leaf to engage said article between said members and clamp said article in position on said support; and means to enable said leaf to be cleared from the work independently of said saws; substantially as described.

Witnesses:

ALEXADER C. PROUDFIT, GEORGE L. PAFoR'r,

Commissioner of Patents,

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