US439532A - Machine for laying off wood-work - Google Patents

Description

(No Model.)

B. G. LOVE. MACHINE FOR LAYING OFF WOOD WORK.

No. 439,532. Patented Oct. 28, 1890.

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UNITED STATES PATENT OFFICE.

ROBERT G. LOVE, OF RICHMOND, VIRGINIA.

MACHINE FOR LAYING OFF WOQD-WORK.

SPECIFICATION forming part of Letters Patent No. 439,532, dated October 28, 1890.

Application filed June 5, 1890A Serial No. 354,407. (No model.)

To aZZ whom it may concern.-

Be it known that I, ROBERT G. LovE, of Richmond, in the county of Henri co and State of Virginia, have invented a new and useful Improvement in Machines for Laying Off Wood-VVork, of which the following is a specification.

My invention is in the nature of a new machine for laying off and marking the stiles of shutters and doors and similar work, preparatory to cutting the mortises therein by a mortising-machine, the object being to save labor by doing the work more expediently than can be donelby hand and to insure exactness and accuracy in the joinerovork.

It consists in the peculiar construction and arrangement of the machine, which I will now proceed to describe with reference to the drawings, in which- Figure l is a front elevation of the machine. Fig. 2 is atop or plan view. Fig. 3 is a vertical transverse section. Fig. 4 is an enlarged plan view of one of the markers and its attachment, and Fig. 5 is a detail side view of one of the marker-blades.

In the drawings, D represents a strong frame-work, the top of which is left unobstructed to form a table or support, upon which the dressed lumber is piled so as to be conveniently accessible to the workman. Upon the front horizontal edge of this frame is fixed a stationary horizontal rail A, which is slotted horizontally, and in which slots are arranged to slide the markers ct, which are best shown in Figs. 4 and 5. These markers have toothed edges, as shown in Fig. 5, and a hole to receive a fastening-screw b, Fig. 4, by which they are connected to a dovetail lug c, which is dropped vertically in a correspond ing groove in a block d. This block is clamped to the railAby means of a screw-bolt e, which passes through the slot of the rail, and which connection permits the block carrying the marker to be adjusted horizontally along the length of the rail to any desired position. There are a number of these markers in the rail, and their position defines the place on the lumber where the marks are to be placed.

To determine the depth of the penetration of the marker-teeth an adjustable stop-screwy is placed in each block 61 beside the markerblade. B is a second movable rail, slotted and provided with markers, and correspond ing to A. This rail B is arranged parallel to A in front of the same, and is adjustably fastened by means of screws K and tailguides g to reciprocating frame C. The object of this adjustment is to increase the space between the rails in adapting the machine to receive wider lumber. This frame 0 slides upon horizontal guide-rods M, which at the inner end are supported by the stationary rail or framework, and at the outer ends are supported by offsetting curved brackets L, bolted at their lower ends to the framework.

To the bottom of frame 0 are jointed the outer ends of curved connecting-bars E, which at their inner ends are jointed to cranks F on a rock-shaft G, arranged in bearings beneath the table. This rock-shaft is connected by other cranks F with a vertical pitman H, which at its lower end is jointed to a treadle I, so that when the treadle is depressed the rock-shaft G rocks and draws the connectingrods E, the frame 0, and the railB inwardly. To force the rail outward again, a vertical leaf-spring J is arranged to force the frame C in the opposite direction; or a weight and pulley may be used for the same purpose.

In making use of this invention the stiles or dressed pieces of lumber are separately placed between the rails A and B, and after being adjusted at the end against a suitable stop the treadle is depressed and the front rail, with its markers, is forced forward, and the piece of lumber between is marked on both sides at once with a never-failing exactness with indentations, which locate the spots where the mortises are to be made.

With this machine one man is enabled in a single day to do the work of several in the ordinary way, and. with much greater exactness and nicety.

Instead of using a treadle for working the machine, it may be arranged to be operated by a power-shaft.

Having thus described my invention, what I claim as new is 1. The combination, with the slotted rail, of the marker-block d, the clampscrew 6, stopscrewf, and marker-blade a, with dovetail lug IOO 0 and screw 12, substantially as shown and de- E, rock-shaft G, with cranks FF the pi'tman scribed. H;tread1e-I,,and spring" J ,substantially as 10 2. The combination of the stationary frame shown and described.

*D with horizontal slotted rail A, having ad- 5 justable markers thereon, the bracket L, and k 7 ROBERT LOVE guide-rods M, fixed to the front ofthe same, Witnesses: the frame 0; sliding on the guide-rods and E. E. TAYLOR,

bearing the marker-rai1B,the connecting-rod R0. T. BRIGGS.

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