USRE221E - Improvement in machines for tonguing boards - Google Patents

Description

UNITED ASTATES PATENT OFFICE.

RANSOM CROSBY, JR., OF NEW YORK N. Y., Assienne on HENRY D. EDG- OOMB AND RANSOM CROSBY, OF SAME PLAGE.

Specification forming part of Letters Patent No. 8,870, dated April 13, 1852-; Rcissuc No.

` July 13, 1852.

To all uhom @t may concern Be it known that RANsoM Cnosnv and HENRY I). EDecoMB, of the city of New York, in the county of New York and State of New York, did invent certain Improvements in Machinery for Ton guing and Grooving Boards and Plank and I do hereby de-I clare that the following is a full, clear, and exact description of the principle or character which distinguishes it from all other things before known, and ofthe usual manner of making, modifying, and using the same, reference being had to the accompanying draw` ings, of which- Figure 3 is an inverted plan; Fig. 4, an elevation of the tonguing side; Fig. 5, a side view of the double tonguing-stock Fig. 6, a section of same.

Great difficulty has been encountered'in the employment of vstationary knives or planes for the purpose of tonguing and grooving boards and plank, for'7 although it would seem that the ordinary construction would act as efficiently for that purpose as upon the surlface, practical experiment has shown insurmountable diiiculties to their employment on account of clogging, which could not be overcome by the most careful adjustment. Our' improvements have been made with a view to overcome these difficulties, and we und by experiment that we have obviated them by the within-described apparatus entirely.

The machine consists of a frame, a, to which the several parts are attached. b is the stock in which the cutters are set for forming the tongue on the board or plank. This stock is tixed to the frame a, and has projections on its inner sides to which the plane bits or cutters are attached in two lines, one on each side of the tongue, leaving an open space between the cutters. The stocks may be made in two parts, so as to -fbe adjustable to different sizes of tongues, as shown in Fig. 5, where the upper part of the stock with its cutters can be moved to or from the lower portion by the screws u.

the throat entirely open.

C is the stock containing the cutters for plowing the groove and also the planes which reduce the board to the proper width as it enters the machine. This stock is made to slide to or from the other stock, b, on the .1 2 l, dated bars ot' the frame d by means-of screws pussing through the frame and made to turn together by bevel-wheels or other suitable contrivance so that the stocks shall always be parallel to each other and move so as to adapt the machine to dierent widths of boards, but to this stock we make no claim.

Attached to the ton guin g stock is a straightedge, e, which serves to guide the board in connection with another straightedge, f, attached to the stock and made to pass upward by the springs g. This straightedge keeps the board in contact with the upper one, e, and adapt themselves to the varying thicknesses of the lumber. A single pair of cutters, h, may be employed or they may in some cases be omitted altogether. The planes or cutters remove the wood on each side of the tongue and are so arranged in the stocks as to allow ot the free escape of the shavings, every part of the stocks between the planes being cut away, except so much as is just sufficient to produce the proper support and action of the cutters, which prevents all difficulties from the clogging or stoppage of the shavings. The planes are placed in succession, each one being set a little deeper than the one preceding it, so as to remove the wood in thin shavings. The movable stock C contains the cutters and planes for plowing the groove. These cutters, as well as those for forming the tongue, may have a lip or edge turned forward on the cutting sides next the tongue, as shown in Fig. 7, showin g-a tonguing-cutter detached,

which makes better work 'when the lumber is wet or cross-grained. That part of the stock on one side of the planes is cut away so as to allow of the free escape to the chipsand prevent choking, and those portions o forming the bed ot' each plane-iron is only attached to the under side of the cap-piece o and to the upper side of the bed-piece of the planestock, leaving an open space between by which I effectually prevent clogging by leaving In cases where the board or plank are required to have a bead next the joint, we form two planes or cutters, P, (see Fig. 5,) so as to cut the bead, as. the board passes through the machine. At the forward end of the stock c are placed the planes K for the purpose of reducing the board to the proper width preparatory to onttin g the tongue and groove. Between the plane-irons are spring bars or rollers l, which are adjustable and serve to keep the boards pressed firmly against the straight-edge m Von theopposite side during their passage into the inachine.,

TheA pl ane-irons and cutters are colored bliie in the drawings.

I ain aware that Harvey Law has described in his patent of April 10, 1849, a inode of tonguing in which two sets of saws are arranged in a frame, with the cutting teeth opposite, andvcutting in one plane on opposite faces of the board, none of which devices-I desire to claim 5 but RANSOM CROSBY, Je.

l Witnesses;

WILLIAM G.HUNTINGTON,

LYS'ANDER WRIGHT.

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