US460408A - Furnace-grate - Google Patents

Description

(No Model.)

J. THURELL'.

FURNACE GRATE'.

No. 460,408. Patented Sept. 29, 1891.,

UNiTEn STATES PATENT Ormcn.

JOHN TI-IURELL, OF ZYLONITE, MASSACHUSETTS.

FURNACE-GRATE.

SPECIFICATION forming part of Letters Patent N 0. 460,408, dated September 29, 1891. Application filed January 3, 1891. Serial No. 376,635. (No model.)

.To ztZZ whom it may concern:

Be it known that I, JOHN THURELL, a citizen of the United States, residing at Zylonite, in the county of Berkshire and State of Massachusetts, have invented new and useful Improvements in Furnace-Grates, of which the following is a specification.

, My invention relates to certain improvements in the construction of furnace-grates, one purpose thereof being to provide a novel and simple construction by which the grateframe shall be very materially strengthened and its warping prevented. It is my purpose also to provide a simple and inexpensive construction whereby the frame of the grate shall be strengthened and stiffened and a fastening provided at the angles thereof by one and the same device.

To these ends my invention consists in the several novel features of construction and new combinations of parts hereinafter fully set forth, and then particularly pointed out and defined in the claims following this specification.

To enable others skilled in the art to which my said invention belongs to make and use it, I will proceed to describe the same, reference being made to the accompanying drawings, in

which Figure 1 is a view, partly in side elevation and partly in longitudinal vertical section, showing the construction of the grate-frame, the manner of uniting the parts thereof, and the grate-bars mounted therein. Fig. 2 is a view in transverse vertical section showing more fully the construction by which-the bars of the grate-frame are united, the gratebars being shown in dotted lines. Fig. 3 is a detail perspective of the parts composing the grate-frame, the grate-bars being removed.

In the said drawings, the reference-numeral 1 denotes the end pieces, and 2 indicates the longitudinal side pieces, of a grate having my novel construction. These parts in former constructions have sometimes been cast in a single piece; but when made in accordance with my invention they are constructed separately and united in the manner hereinafter described to produce the form of frame shown in Fig. 3, in which the side bars and end bars of the frame are cast separately, each in a single piece, the end pieces being provided with tenons 4, adapted to enter mortises 5 in the side pieces, and being retained in this engagement by means of a metallic rod 6,1ying in a horizontal channel or groove 7, formed in the inner face of each end piece. The ends of each rod enter apertures in the ends of the side pieces and project somewhat beyond the outer faces thereof, being adapted to receive nuts upon said extremities, which would then be threaded for such purpose. These bars may, however, be fastened in other ways-as, for example, by upsetting or heading theirprojecting ends. In order that the nuts or upset ends may not project beyond the outer faces of the side bars, shallow recesses 8 may be provided in the outer face of each side bar j ust above the ends of the tenons 4. These rods are of great use in preventing the warping of the grate, as well as in permanently uniting the parts of the latter. The journals of the rock-shafts are inserted in their seats in the side bars before the parts of the frame are brought into position for permanent union.

While this grate, having the construction set forth, may be used in any ordinary form of furnace, I have employed it in connection with the furnace for which I made application for Letters Patent, filed December 27, 1890, Serial No. 375,973, and allowed April 7, 1891.

By placing the tie-rods '7 in channels in opposite bars or sides of the frame they are not only removed from the area inclosed by the frame, but are protected from the direct action of the fire, their serviceable condition being greatly prolonged thereby. Moreover, by combining the tenons 4 and rod 6, I am enabled to secure a fastening which is far more efficacious than any that can be produced by either device alone. These devices give a rigid joint, which will not only resist the racking strains produced by shaking and dump ing the grate, but will prevent the warping of the same. The frame may be readily dismembered, however, and again connected with great case.

That I claim is 1. In a furnace-grate, the combination, with separately-formed end bars and side bars provided with tenons upon one entering mortises in the other, of tie-rods lying in channels in op posite bars of the grate, the ends of said rods projecting in parallelism with the tenons and passing through the ends of the two remaining sides to form fastenings to draw and hold 5 the side and end bars together at the angles of the grate, substantially as described.

2. In afurnace-grate, the combination, with separately-formed end bars and side bars, two of said bars being provided with tenons upon IO their ends entering mortises in the ends of the remaining bars, of tie-rods lying in channels in the bars, having tenons, the ends of said rods projecting and entering openingsin the ends of the mortised bars, the latterbeing provided with recesses adjacent to the inorr5 tises, whereby the fastenings afforded by the said rods shall not project beyond the outer surface of the grate,substantially as described.

In testimony whereof I have hereunto set my hand and affixed my seal in presence of 20 tWo subscribing witnesses.

JOHN Tl-IURELL. n s] Witnesses:

ED. GUILBo, J. A. WIoKEs.

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