US149433A - Improvement in tables for mortising-machines - Google Patents

Description

C. BRYANT.

Tables for Mortisng-Mac-hines.

Patented Aprl7,1874.

UNITED STATES PATENTv OFFICE.

CHRISTOPHER BRYANT, OF WORCESTER, MASSACHUSETTS.

IMPROVEMENT IN TABLES FOR MORTlSlNG-MACHINES.

Specification forming part of Lettere Patent No. 149,433, dated April 7, 1874; application tiled March 7, 1874.

To all 10h-om 'it may concern Be it known that I, CHRrs'roPHER BRYANT, of the city and county of Torcester and Commonwealth ot' Massachusetts, have invented certain newan d useful Improvements in Tables for lVIortising-llaehines for cutting windowjambs for the reception of their pulleys and pulley-plates; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and in which- Figure l represents a top or plan view of said table. Fig. 2 represents a vertical central section on line A B, Fig. l; and Fig. 3 represents a top or plan view of the table when used in a somewhat different manner from that shown in Figs. l and 2.

To enable those skilled in the art to which my invention belongs to make and use the same, I will proceed to describe it more in detail.

In the drawings, the part marked A represents the table of a common mortising-machine, and which table, it will be understood,is capable ot' being adjusted back and forward under the chisel. Upon the top of table A is placed the main part B of my improved table, having a stop-piece, a, fastened to the under side at one end, and an adjustable stop-piece, b, secured at the other end. Piece bis formed with two earpieces, l and 2, which t to the edge of part B, and through the ear-piece l is passed a thumb-screw, b', whereby said piece b can be set;at a greater or less distance from the end of the part B. Upon the other end ot' the part B is secured a cross-piece, B', on its upper side. Upon the cross-pieee B is fastened the rear end of a spring holding-piece, C, the front end of which is provided with a thumbpiece, c, and astop or holding piece, D, to tit the dado e in the end of the jamb E.

The operation is as follows: The operatorl places table B upon the mortising-maehiue table A, and then adjusts clamp-stop b to give the necessary longitudinal :motion to table B for cutting the mortise, both for the pulley and cord, as well as that for the pulley-plate. One end of the jamb E for the window-easing is then placed upon table B, and if of that class having dadoes or notches e, the stop part D of spring-piece C is allowed to enter the same, as shown in Fig. 2. The mortising-maehine table is now adjusted to bring the jamb into the proper position as respects the chisel, when the table B, with the jamb thereon, is moved, while the chisel is in operation, from a central position, longitudinally, until stop a strikes against the end of table A, when the chisel is reversed, and table B is moved longitudinally in the other direction until stop b strikes the other end of table A, when the work is completed. If the jambs do not have the groove e, the stop-piece d is turned around for the jamb to abut against, as shown in Fig. 3, and stop-piece D rests upon the jamb, its point j' entering the wood, and holding the jamb from slipping longitudinally out of place while the mortise is being cut. I prefer, in general practice, to have two spring-pieces, C, 011e having a point, j", and the other none, since, when mortising those having the dadoes ornotches e, the stop D entering said groove is sufficient without the point j'.

By having two spring-pieces, C, one can be removed easily and the other substituted, as occasion may require. When not in use, the piece d can be turned out ot' the way under the spring-piece C, as shown in Fig. 1. It will be observed that both the table B and the jamb are pushed back against the back A otl the table A.

The invention above described is designed to be used more particularly iu connection with an improved chisel for cutting the pulley and plate mortises at the same time, and `for which improvement in chisels I have heretofore applied for Letters Patent.

It will be understood that mortising-table A, as well as my improved table above described, may be of any desired length, those shown in the drawings being suilieient to illust ate the principle and mode of operation of .my said invention, which has been fully tested, and has been found to be of great practical value and importance, since an inexperienced workmamby the aid of one of my improved ehisels and the above-described table, can eut the mortises with far greater accuracy and precision than the most skillful workman could perform the same operation as practiced previous to my said improvements, while at the same time he can do about four or five times as much Work in the same length of time. Previous to my said invention/[he mortises had to be laid out, and they were out by two different operations-that is, the mortise for the pulley-plate Was not eut by the same operation which cut the mortise for the pulley and cord.

It will be noticed that the arrangement is sueh, that after the mortising-machine table A has been onee adj usted laterally, no further adjustment is required, and all the operator has to do is to place the jambs E in position, as shown, and then move the table B back and forth as the Work progresses, reversing the chisel at the proper time, so as to eut the mortise at both ends in the proper shape.

Having described my improved table for mortising` `or cutting,` windoW-jambs, what I claim therein as new and of my invention, and desire to secure by Letters Patent, is-

l. The combination, with the table part B, of stop-piece a, cross-piece B', and spring holding-piece G, provided with stop-piece D, substantially as and for the purpose set forth.

2. The combination, With the table part B, ot' stop-pin a, adjusting stop-piece b, stop-piece d, and spring holding-piece C, substantially as and for the purposes set forth.

' CHRISTOPHER BRYANT.

Witnesses: Y

EDWIN E. MOORE, Trios I-l. DODGE.

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