US99486A - Improvement in head-blocks for saw-mills - Google Patents

Description

UNITED STATES PATENT OEEIcE.d

GEORGE SELDEN AND O. O. BRIGGS, OF ERIE, PENNSYLVANIA, ASSIGNORS TO GEORGE SELDEN. d

IMPROVEMENT IN HEAD-BLOCKS FOR SAW-MILLS.

Specification forming part of Letters Patent No. 99,486, dated February l, 1870.

We, GEORGE SELDEN and O. C. Baisers, of

the city and county of Erie, and State of Pennsylvania, have invented a new and Improved Hawk-Bill Attachment for Saw-Mill Head- Blocks, of which the following is a specification: M

The nature of our invention consists in providin g an apparatus to be attached to the knees of saw-mill head-blocks, by which the last board can be held in place while the boards next to the last are being sawed.

The accompanying drawings represent our invention, as follows:

Figure l is a side view oi' our invention, and shows it as attached to the knee of a saw-mill head-block. Fig. 2 is an end view of the same. Fig. 3 is also a side view, showing a different arrangement of levers by which the same result is accomplished.

The following is a description of our invention: l

B is the main knee, to the side of which we attach our invention. l) and D' are two irons, which are drawn out to a point, resembling a hawks bill at one end, and are punched for a bolt at the other end and in the middle.

C, Figs. l and 2, is a connecting-bar, which connects the two hawk-bills at their outer ends with the lever A. In Figs. l and 2 the hawkbills D and D' are pivoted on the bolts which hold them to the knee B, and the connectingbar C is attached by pivot-bolts through the holes in their outer ends. The leverA is also pivoted on the bolt which attaches it to the knee B and to the conectingbar C.

It will be seen that when the lever A is raised the hawk-bills have their points thrown out from beyond the face of the knee B, and their points enter the timber or log, which is on the bed X, and will hold it in place; and

when the lever A is pressed down, as shown, Fig. 1, by the dotted lines, the bills are withdrawn from the timber.

In Fig. 3 the arrangement of the lever is different, while the object to be accomplished is the same. In this arrangement the hawkbills are secured to the knee, as in Figs. 1 and 2, except the hawk-bill D' is pivoted at the end, instead of in the middle, and the lever A is pivoted to the bracket-irons F and F', in place of being pivoted to the kneel B, and is changed from a lever ofthe first kind to a lever of the third kind, and its direction is also reversed and in place of the hawk-bills being acted upon by the leverA directly through the connecting-bar C, they are moved by the toggle-joint levers G and G', which are connected With the lever A by the connecting-bar E. Thus it will be seen that the hawk-bill D is a lever of the rst kind; D' is a lever of the second kind; G and G' form a toggle-joint leverage; and the whole is operated by the lever A, which is a lever ot' the third kind. This arrangement is 1n uch more powerful than that shown in Figs. l and 2.

What we claim is as follows:

1. The lever A and connecting-bar O, in combination with the hawk-bills D and D',

when the same are arranged as and for the purposes set forth.

2. The lever A, connecting-bar E, toggles G and G', in combination with the hawk-bills D and D', when the same are arranged as and for the purposesset forth.

O. O. BRIGGS. GEO. SELDEN.

Witnesses:

M. L. STONE, JN0. K. HALLocK.

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