US13594A - Method of regulating- length of stroke in moutising-machines - Google Patents

Description

UNITED STATES PATENT OFFICE.

EZRA GOULD, OF NEWTARK, NEW' JERSEY.

METHOD OF REGULATING- LENGTH OF-STROKE IN MO'RTISING-MACHINES.

Specification of Letters Patent No. 13,594, dated September 25, 1855.

To all whom t may concern:

f' Be it known that I, EZRA GOULD, of Newark, in the county of Essex and State of New Jersey, have invented a new and Improved Mortising-h/Iacliine; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l, is a side view of my improvement, the driving` pulley at the upper end of thev machine being bisected through its center, as indicated by the line w, Fig. 3. Fig. 9., is a front view of ditto. Fig. 8, is a back view of the driving pulley.

Similar letters of reference indicate corresponding parts in the several figures.

The nature of my invention consists in giving a variable throw or vibration to the arbor to which the chisel is attached, by means of a curved slotted arm and plate, said plate having a pin attached to it which fits in the upper end of a connecting rod, the plate also having a pin attached which fits in the slot of the curved arm. The curved arm is moved or operated by gearing which will be presently shown and described, and the connecting rod is attached to the arbor of the chisel.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, represents the driving pulley of the machine the shaft a, of which works in a bearing b, at the upper part of a suitable framing B. The pulley A, has a radial slot c, made in it, from its center to its periphery,

and this slot has guides d, CZ, at each side of it on the outer side of the pulley, between which guides a plate e, is fitted and works.

To the inner end of the plate e, there is attached a pin f, to which the upper end of a rod- C, is connected, the lower end of said rod being attached to a guide block g, which is connected to an arbor D, said arbor working in suitable guides or bearings h, attached to the framing B. To the outer end of the plate e, there is attached a pin z', which passes through the slot c, and into a slot j, in a curved arm E, which works against the back side of the driving pulley A. The inner end of the arm E, has a pinion 7c, attached to it, and this pinion is fitted loosely on'the shaft a.

Upon the end of the shaft a, opposite to the end to which the pulley A, is attached,

there is placed loosely a pinion Z, said pinion being between a circular plate m, attached permanently to the shaft a, and a pinion n, which turns with the shaft a, and still is allowed to slide upon it, in consequence of it being attached thereto by a groove and feather.

Underneath the shaft a, there is a shaft 0, which works in suitable bearings 29, p, on the framing B. The shaft 0, has a pinion g, attached permanently to one end, said pinion gearing into the pinion lo, attached to the arm E. The opposite end of the shaft 0, has a pinion r, attached permanently to it, and a loose pinion s, is placed upon it, the pinion s, being between the pinion (r) and a circular plate t, attached to the end of the shaft by a feather and groove. The pinion 7, gears into the loose pinion Z, on the shaft a, and the loose pinion s, on the shaft 0, gears into the pinion n, on the shaft 0.

To the upper end of the framing B, at its back part there is attached a lever F. The fulcrum of said lever is at u. The upper end of the lever F, bears against the end of a collar e, attached to the pinion n, and the lever below the fulcrum u, bears against a collar fw, attached to the circular plate t. The lever F, may be connected in any proper manner to a treadle so that the lever may be operated by the foot.

. To the front upright of the framing B, a bed plate Gr, is attached by a socket H, and set screw a', the socket sliding on the upright and secured at any desired point by the set screw.

I, I, are rods which pass through a plate J, attached to the framing B, the rods being over the bed plate G.

Motion is given the machine by a band passing around the pulley A. The stuff to be mortised is placed upon the bed plate G, and clamped between the lower ends of the rods I, I. Now if the lever F, be so operated that the part of the lever F, below the fulcrum n, bears upon the collar w, of the plate t, said plate t, will clamp the pinion s, between itself and t-he pinion r, and the pinion n, on the shaft a, will give motion to the shaft 0, which will be slower than the shaft a. The pinion g, turns the pinion 7c, and the arm E, will consequently be turned and will draw the plate e, from the center of the pulley to the outer end of the slots y', and c, and the arbor D, will then have its greatest throw or length of vibration. By moving the lever F, in the opposite direction so that the upper end of the lever F, will bear against the collar 0, of the pinion n, the pinion Z, will be clamped between the pinion n, and plate m, and the pinion Z, will then turn the pinion 1^, and as the pinion Z, is larger than the pinion r, the shaft 0, will rotate faster than the shaft a, and the arm E, will consequently be moved in the opposite direction and the plate c, will be moved to the inner end of the slots y', and c, and the arbor D, will remain stationary while the pulley A, rotates.

When the stuff is to be adjusted upon the bed piece Gr, the lever F, is moved as above described so as to stop the throw or vibration of the arbor, and when the stuff is properly adjusted on the bed piece the lever is moved in the opposite direction and the arbor obtains gradually its greatest throw or vibration each stroke gradually increasing in length till the plate e, reaches the outer ends of the slots j, 0. By this variable throw the stuff may be adjusted upon and taken from the bed piece G, without stopping the inotion of the pulley A, and the chisel which is attached to the lower end of the arbor may also be turned without stopping the pulley, for if the vibration of the arbor is stopped that is all that is required. Further a great advantage is obtained in mortising by having the stroke of the arbor gradually increase in length, because the chisel cannot readily enter the wood the full depth of the mo-rtise at the first cut, but by having the cuts gradually increase in dept-h at each stroke the chisel can easily part the wood or chips at each cut and mortises may be cut without breaking the chisel, it being understood that the chisel is reversed at the end of the mortise and the stuff moved in the opposite direction upon the bed plate as usual.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

Attaching the connecting rod C, to a curved slot-ted arm E, by means of the plate e, and pins f, z', the plate e, working in a slot c, in the pulley A, and the arm E, operated by meansbfthe gearing Z, n, p, s, and g, Z0, arranged as shown or in an equivalent way for the purpose specified.

EZRA GOULD.

Witnesses:

FRANCIS H. GroULD, DAVID ALMOND.

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