US82792A - bowdle - Google Patents

Description

@uitga gieten guttnt @ffice T. J. BOWDLE, S. R. LAWDER, AND F. JOHNSTON, OF PIQUA, OHIO.

Lettersv Patent No. 82,792, dated October 6, 1868.

IMPROVEMENT IN MACHINES FOR TENONING BLIND-SLATS.

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TO ALLWHOM IT MAY OONCERN:

Be it known that we, T. J. BowDLE, S. LAWDER, and F. E. JOHNSTON, of. Piqua, in the county of Miami, and State of Ohio, have invented a new and' improved Machine for Tenoning Blind-Sluts; and we do hereby declare the `following to be a full and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, in whichl Figure 1 isla plan view of our blind-slet tenoner, with movements thereof illustratedin red lines.

Figure 2, a plan view of the same reversed, showing the underside thereof, having -also an illustration of its movement in redA lines. I

Figure 3, a section in the line a: z, and l Figure 4 a section in line y y of iig. 1.

Similar letters indicate like parts in each oi' the figures. v

The nature-of our invention consists in the combinationof a T-sbaped centrally-pivoted 1ever,4with suitable toggle-joint levers, for the purpose of moving a pair of sliding bits or cutters to and from each other, so as to cut and form the shoulders upon the end of ablind-slat.

Also, in causing, by means of a suitable link connecting the T-shaped vibrating lever lwith a-collar actuating a sliding tubular centre-bit, an approach of said tubular bit simultaneously with the approach of the 4 shoulder-bits, to cgt and form a journal upon the end of the slat. i

Also, in imparting'a rotary movement to said tubular bit, in -its approach to the slat, by means of a pin in the box or collar supporting the bit engaging a spiral groove on the periphery thereof, or vice versa.

To enable others skilled in lthe art to-make and use this our invention, we will proceed to describe its construction and operation.

VUpon a suitable table or bed-pla te, A, we secure, in a right line, ways B B B Bj, igs. 1 and 3, between which the carriages or stocks C C, which carry the shoulder-bits or cutters A A, slide freely. v

An interval is left between the opposite ends of the ways, sufficient to allow the introduction of the -slat to be tenoned, and of the devices for securing the same, as seen in fig. 1.

To each carriage, C, is secured an arm, D, (see iig. 3,) projecting downward through a slot cut in the table between the ways B and B', of such a length as-to permit the extent of. movement required in the bit-carriages C. These arms D, instead of being fastened immovably to the carriages C, pass-through slots, b, therein, and

are secured at any desired 'point along the slots by means of set-screws c, so as to permit an adjustment of the carriages with reference to 'the levers connected to said arms D, as hereinafter described.

At right angles to the ways B B B B', and in a line central between thc oppositencnds thereof, we support, in suitable boxes, E E, a tubular bit, F, so that vitmay not only s'lide freely back and forth, but also revolve therein.

A loose collar, G, having an arm, H, iig. 2, projecting downward through a slot, cl, cutin the table in theA line of movement of the bit, encircles the same midway between its bearings at .E E, and is held in place by adjusting-rings I, fig. 1, secured to the-bit, on either side ofthe collar, by means of set-screws In a right line with said tubular bit, and on the opposite side of4 the bit-carriages C C, is placed a supportingblock, K, to hold the end of the slat to'b'e-tenoned, (see slat in red lines, g. 1,) secured by a clamp, f, -sliding in a slot, y, fig. 1, in the table beneath, which permits its adjustment at a proper distance from the bits. This block is fitted with guide-pieces' and set-screws to hold and secure the end of the slat in a proper position whilst the bits a are cutting the same. I I

Provision is also made for the support of the other end of the slat,vby means of a second block, K', seciired also by a clamp'sliding in the same slot g, which is extended for the purpose to the outer-edge ofthe table, and provided withsuitable retaining-devices and set-screws.

A carriage, L, is arranged to slide vertically in Ways t t, iig. 2, against the end of the table at the termination ofthe slot g, in which is formed a groove, g', to receivethe clamp ofthe rear block Ki, so that the block may slide along the slotg into the groove g of 4the carriage L, and be' elevated vertically whenever the character of the work requires that the slat be inclined whilst being tenoncrl.v

A bent T-shapedlever, P, iig. 2, is pivoted centrally to the under side of the table, so that its pivot, h, shall be at the intersection ofthe axis of the tubular bit with the line of movement of the shoulder-bits. The long arm K of the lever P extends out beyond the side of the table, and forms a handle wherewith to-vibrate the same.

To the end of each of the shorter arms, 19'21", of the lever is pvoted a short link, M-M, extending to a toggle-joint formed by two short levers N N, the one Vpivot-ed to the tablc, and thc other to a,plate on the rod or arm D, extending through the slot from the shoulder-bit carriage above, the shorter arms p p, of the lever extending in opposite directions, being so bent as to `projectV respectively on opposite sides of the. line of the slots beneath the bit-carriages C C, (see dotted lines, fig. l.) Hence, by vibrating the long arm p, oftheilcver P, the shorter arms p'p,rocking or swinging upon the pivot L of' the lever, will double the toggle-joints N N; andthus cause the carriages C C to slide in their ways.

The adjustment of the toggle-levers N with the actuating-lever P and with the sliding carriages C, is so made as that the hits a shall be closed upon the slat when the toggle-levers are straight, so that a vibration ot' the lever P in either direction will, by bcnding'tllejoints.l cause the bits to separate.

The movements ol' the lever P may be so controlled as to allow it to pass beyond the dead-point ofl the toggles, (as illustrated by red lines, fig. 2,) so as to cause, by the continued movement of the lever in one direction, a slight withdrawal of the shoulder-bits after they haveclosed, and, upon its reversal, to cause them to close again before they are finally separated after cutting the shoulders upon the slat. l

To obtain an approach of the tubular centre-bit simultaneously with the closing of the shoulder-bitsa a, we connect the arm H, projecting from the collar G thereon, with one arm, p', of the lever P," by means of a pivoted link, R, so adjusting the link asthat the tubular 'hit F shall advance towards the end of the slat at the same time that the side bits a are closing to eut thc shoulders thereon. Where amovcuicnt ot' the'lever P, to i push the toggle-levers N beyond their right line or dead-point, as illustrated in red lines, fig. 2, is allowed, so as to cause the bits a to withdraw again slightly' after closing the tubular bit will still continue to advance steadily until the lever P is reversed.

This combination and adjustment ofthe lever P with the toggle-levers N is desirable, inasmuch as the side bits a, closing once more upon the shoulders previously cut on the slat before they' are entirely withdrawn therefrom, will give a finish thereto, removing all roughness or imperfection therefrom.

A pin, sg. `4, in the inner periphery of the front box or collar E of the tubular bit, engagesin a spiral groove, t, cut on the outer s urfaeeof said bit, so that as the bit moves forward it is made to revolve slowly in its bearings within the boxes E. l

The rings I, held by set-screws z'z'on either side of' the loose collar G, permit an adjustment of the bit to or from the shoulder-bits a. These are held in their stocks or carriages C by suitable ser-screws v.

The carriages C are themselves adjustable by means of the arms D in the slots Z1 of the carriages.

Having thus fully describcdour invention, we claim therein as new, and desire to secure by Letters Patent- 1. A T-shaped vibrating lever P, in combination with toggle-joint levers NnN, suitable connecting-links M.M,- and with sliding carriages C C, carrying the shoulder-cutting bits a a of a slat-tenoning machine, all arranged and operating substantially as and for the purpose herein set forth. i

2. In combination with the foregoing devices, combining with one arm, p', of said vibrating lever P, a connecting-link R, pivoted to a collar, Gr, embracing the tubular centre-bit' F of the machine for the purpose of operating the same, all substantially as is herein specified. i

T. J. BOWDLE.

S. R. LAWDER. Witnesses; F. E. JOHNSTON.

WM. WHITE,

J. F. McKINNEY.

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