US156437A - Improvement in whiffletree-centers - Google Patents

Description

UNITED STATES PATENTQEECE- HENRY PORTER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN WHIFFLETREE-CENTERS.

Specification forming part of Letters Patent No. 156,432', dated November 3, 1874; application filed March 2e, 1874.

To all whom it may concern:

Be it known that I, HENRY K. PORTER, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful W hiflietree-Center, of which the following is a specification:

The invention consists in the peculiar construction of the locks of the pivot irons or circles, so that they are cast complete and ready for use without iinishing, and yet possess all the desired advantages of those which are constructed at much greater cost, and which are wrought into form by expensive processes.

Figure l is a vertical Y,section taken on line W X, Fig. 3, and line U V, Figs. 4, 5, and 6, and shows the halves of the circle when united, the line of this section being in the direction of the axis of the whifdetree. Fig. 2 is also a vertical section, taken on the lines Q R S T and Y Z of Figs. 3, 4, 5, and 6. Fig. 3 is a bottom side or plan view of A. Fig. 4 is a top side or plan view of B. Fig. 5 is a top side or plan view of A. Fig. 6 is a bottom side or plan view ot B.

A is the half of the circle, which is attached to the whifietree; and B, that which is secured to the cross-bar by screws, as shown at u. a is the hole for the bolt; and b is a concentric ange formed upon B, and which fits into the circulai` recess formed in A. (Shown in Figs. 1 and 2, and marked cin Fig. d d are flanges forming segments of a circle, a part, as shown inside dotted line g, being cut away for the purpose hereinafter stated. f f are apertures corresponding to but slightly larger than flanges d, and cut through bed A, so that when molded -for casting, the sand beneath ianges d d and between its lower` plane and the-upper plane of the main bed, as shown f in Fig. 3, shall be supported by that in recesses f, and allow the withdrawal of the pattern, yet leaving the perfect sand-mold beneath the flanges. h, Figs. 1, 2, and 6, represents a thin bar extending across the aperture in circle B, the circular flange or thimble b being formed upon this bar. i i are two segmentary flanges, formed flush with the top of the circle or plate B, as shown in Fig. 2. The dotted line k, Fig. 4, shows the part of this circular iiange which is cut away for the purpose hereinafter stated. j j are apertures directly beneath but slightly larger than flanges M, and which constitute the space between bar h and the circular space cut in the main bed. The object of these spaces j is the same as the spaces f fin circle A, as before eX- plained.

For the purpose of uniting these two halves of the circle, one half is rotated horizontally ninety degrees relatively to the other, when the flanges d d of plate A will occupy the space la, cut away between anges i i, plate B, and

the ijanges i will occupy the spaces g, cut` away between the iianges d in plate A, thereby allowing the main plates to be brought together, when, by rotating one of the plates ninety degrees, the iianges d d and i i will be locked each behind the other, as shown in Fig. 2, while the circular ange b serves to prevent all lateral motion.

By this peculiar construction Iam enabled to cast, perfect and iinished, a centrally-pivoted and most safely-locking circle, without increase of expense over the most unsafe kind.

Having thus described my invention, what I claim ish A whiflietree circle or center consisting of the combined parts A B, formed respectively with the flanges d d and t' c', and the apertures f f and j j, substantially as described and shown.

HENRY K. PORTER.

Witnesses EBEN HUTcHINsoN, SAML. W. CLARKE.

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