US7340A - Adjustable mouthpiece to boad-sckapers - Google Patents

Description

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emrah STATES PATENT orare. 1 N

` SHADRAGH DAVIS, or DARTMOUTH; MASSACHUSETTS.

`ADJUs'rABLE MoUTHPIEoE To ROAD-sciaArnRs.

Speccationof Letters Patent No. 7,340, dated May 7, 1850.

T 0 all whom, it may concern Be it known -that I, SHADRACH DAVIS, of Dartmouth, in the county of Bristol and Commonwealth of Massachusetts, have invented a new and useful Improvement in Road-Scrapers or Soil-Excavators; and I hereby declare that the following is a full, clear, and eXac-t description of the construc-` tion and operation of the same, in connection with the annexed drawings, as hereafter referred to, and` which I make a part of this speciiication, viz: Figure l, being a perspective view of the instrument when completed. Fig. 2, is a like view of the main body, separated from the mouthpiece. Fig. 3 is a front view, on a larger scale, of the mouthpiece; and Fig. l is an end view of the mouthpiece.

This description may be more clearly made and more readily understood by presenting if under the three following heads viz. First, the main body, secondly, the mouthpiece; and lastly, the points or teeth.

l. In describing the main body, it will be sufficient to say, that it is made like the well known road scraper, in a scoop form, with open front, having handles about three feet long, with sides and end hind piece from nine to twelve inches high and about o-ne inch thick, of strong hard wood, with the bottom, and, top of the edge of the side pieces properly ironed, and about twenty* seven and half inches square. A bevel upward, of forty-ive degrees is made on the front edge of the bottom to cover a bevel in the mouth piece, when the two parts are joined together. In the outer surface of the forward end of each side piece is cut a cavity or bed, half an inch deep, its forward section describing the arc of a circle A, B, in Fig. 2, whose radius from the center bolt C, is six inches. In the circle of this arc is the set screws (Z, and the holes e, e, to receive the set Screw when the dip or pitch of the mouth piece is changed as hereafter described.

The mouth piece represented by Fig. 3 is made of cast iron, cast in one piece, except the points or teeth which are cast each separately. Although this be cast in one piece it has various forms in different parts of it fitted both for its junction with the main body, and also for receiving the points or teeth. The bottom is seven inches, fore and aft, andtwenty-seven and half inches from sides, inclusive; its back edge being an inch thick, is beveled downward forty` five degrees to match the bevel upward, as already stated in the main body when joined. In the under surface of the bottom,

are cast ive cavities, directly under the.,

teeth 1, 2, 3, t, 5, which cavities correspond to the cav-ities in the teeth as hereafter described. In the top surface, are cast five` places to receive these teeth. These places are five and half inches wide forward,taper ing three and one half inches, to the width of two inches, then continuing that width till they terminate in the bevel aforesaid. These places are cast with dovetailed grooves in the sides about half an inch deep, and so convex from side to side as to fill the cavities of the teeth hereafter described, as they slide into these places in a dovetailed way. This bottom is made gradually thinner, terminating forward in an edge. The sides of the mouth piece are about nine inches high, with parts extending backward beyond the botto-m, of size and shape fitted to fill thecavities or beds, in the forward ends of the sides of the main body as before described. The sides of the mouth piece also are cast with shoulders on their inner surfaces, and of shapes tted to rest vagainst the sloped ends of the sides of the main body, as represented at F in Fig. 2. These shoulders are of the same thickness, as the ends of the main body, against which they rest. And the whole thickness of these sides at the shoulders is one inch, made gradually thinner and terminating forward in edges. The mouth piece, being thus `pre pared, is joined to the main body and kept firmly in its place by the center bolt o, and the set screw d, in Fig. l. This bolt and screw are half an inch in diameter. The peculiar advantage of this joint, connecting the mouth piece to the main body, consists in regulating at pleasure, the dip or pitch of the teeth, to accommodate the improvement fourths of an inch thick in the center; and made gradually thinner, toward their points` `to uneven surfaces, and hard and loose soils.

and sides, until they terminate in an edge.-

They are five and a half inches wide, in the center, and ve and one-half inches long --from the center, each way, eleven both ways) tapering three and half inches each way, to the width of two inches, and terminating in points of two inches square. These teeth arecast with holes at one end half an inch an inch from those ends as represented by, fa .f7 fifa fa and ga gv gv'g'a ga 1n Flg 3'- is YT hese holes are made to fasten the teeth to the bottom of the mouth piece when they are new, with screws; wilhelm;

the same purpose when Mphp pgiants a1;e;re -Vl'sdlls-HSG; 'heveibercmeishorter. The'te''tliwn Figr'e"represented as fastened in theirappropriate places, when new, with screws, after having been slid into the grooved places prepared for them in the bottom of the mouth piece. These teeth combine many advantages over any other contrivance heretofore in use. For being double pointed one is nearly equal to two of those before used with but one point; being concave they are not so liable to be thrown out of the ground when in operation, and will continue sharp by use; being movable, when no longer lit for use,'they can be replaced with others at trifling expense Without a new bed piece; and being concave and convex, suiicient strength is given them, with less weight of iron.

Fig. l, represents the instrumentror machine, with my improvement completed and ready for operation; the commo-n and well known fixtures being added, by which to apply the moving power.

I have described the several parts and the entire machine as to dimensions, as applicable to one of a convenient size and strength for common uses by horses or oxen. VBut when it is wanted for removing sand bars in rivers or harbors, or deepening anchorage ground, and other heavy operations, with steam or other great power, as it may be, its size and strength must be increased accordingly. On land it may be operated withor without wheels, andwin the water by any known appliances adapted to the particular operation intended.

What I claim as my invention anddesire to secure by Letters Patent is- Y c Combining with the body of .a scraper, a mouthpiece'which can be adjusted to form various angles with the bottom of the scraper substantially in the manner and for the purposes herein described.

SHADRACH DAVIS.

Witnesses i CYRUs ALBEN, WESTON CLARK.

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