US237912A - Half to feedeeick l - Google Patents

Description

2 Sheets-Sheet 2.

(No Model.)

Scroll Saw.

' No. 237,912. Patented Feb. 15,1881.

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FRIEDERIOH SOHAEFLE, OF ALTIMORldMAYLAl-D, ASSIGNOR OF ONE- HALF TO FREDERICK L. VOLZ, OF SAME PLACE.

SCROLL-SAW.

SPECIFICATION forming part of Letters Patent No. 237,912, dated February 15, 1881.

Application filed November 29, 1880.

To all whom it may concern Be it known that I, Fnrnnnnrcn SGHAEFLE, a citizen of the German Empire, residing at Baltimore, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Scroll-Saws; and I do hereby declare the following to be afull,clear, and exact description of the invention, such as will enable others skilled in the art to which ro it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or igures of reference marked thereon, which form a part of thissliecification.

This invent-ion relatestto certain improvements combined in a gig-sawing machine of that class in which the saw is adapted to be revolved while it reciprocates.

The improvement will-irst be described, and the invention then designated in the claims.

In the accompanying drawings, Figure l is a front elevation of a machine embodying the invention. Fig. 2 is a side elevation of same. Fig. 3 is a detail view, larger scale, of upper slide-rod. Fig. 4 is a cross-section of same,v z5 showing guide-rollers. Fig. 5 is a front view of lower slide-rod and guides.V Fig. 6 is a transverse view of same. Fig. 7 is a top view of cross-head and guides; Fig. S is a crosssectiou of slide-rod, showing the bevel-wheel 3o and feather. Figs. 9 and l0 are views of the double ratchet-wheel, pawls, and weights.

The letterA designates an ordinary saw; B, the table; O, the frame by which the Lipper end of the saw is supported. Each end of the 3 5 saw is attached to avertically-sliding rod,`the upper one being designated bythe letter A', and the lower one by the letter A2. In crossvsection these rods are round, in order that they may both slide and turn in their station- 4o ary guides c. Each rod has a groove, a, ex-

tending lengthwise, for a purpose hereinafter named. The upper end ot' the upper. rod has a hook, b, swiveled thereto. A pulley, D, is

mounted on a standard, D', upon the top of the frame, and a band, c, of any suitable material is attached by one end to the hook and passed over the pulley, and by theother end to the movable end of a pivoted arm,`E, on which a spring, d, acts to keep'said end of the arm 5o normally depressed. This arm, by drawing (No model.)

constantly on the band, serves to keep the saw taut or strained on its upward stroke. The lower rod4 has a cross-head, F, secured to it, which slides up and down in guides ff. Attached to the cross-head is a pin, g, to which the pitman G connects. The other end of the pitm an isattached to the crank-head h, mounted on the drive-shaft h,to which power is applied by the pulley i.

To cause the saw to revolve or partly revolve 6o while in motion, a bevel-gear wheel, J, is provided and placed to turn in a horizontal plane,

-and has a-central eye, through which the upper slide-rod passes. A lug or feather, 7c, (see Fig. 8,) secured in the eye of the wheel, fits in the groove a of the rod, and prevents therod from turning'withiu the eye,but allows it to slide freely endwise. This wheel is held to its seat by a curved plate, m, and gears with a wheel, u, mounted on a horizontal shaft, n. 7o Another bevel-gear wheel, J', is placed to turn in a horizontal plane, and is constructed`with an eye and feather exactly like' the wheel J, and vthrough the said wheel J' the lower sliderod, A2, passes. This wheel is sustained between the guide c and the hanger or bracket m', (see Fig. 5,) and gears with a wheel, p, mounted on a horizontal shaft, p. At the end of each of the shafts n' and p' 'is a bevel-gear wheel, (designated, respectively, n2 'and 192.) A 8o vertical shaft, L, carries two bevelgears, J2 and J3, which are engaged with the wheels n2 and p2. The lower end of the vertical shaft is sustained by the step q, and near the lower end acrown double ratchet-wheel, N, is secu red. 8 5 Two arms, P, are each separately pivoted by one end to the vertical shaft L, just above the crown ratchet-wheel, and each arm carries at its extremity a pawl, r, which engages with one of the two circles of ratchet-teeth. One arm 9o and pawl is arranged to turn the wheel in one direction, and the other arm and pawLin the opposite direction.

Upon the floor, at the front of the machine, are two treadles, s, shaped like a bell-crank lever. From the upward-projectin g part of each of the treadle-levers a cord, t, extends back and over the ratchet-wheel, and to each of the cords one ofthe pawls r is attached. The cord thence passes over a pulley, u, suspended Vfrom a hangroo er, u', and at the end of each cord a wei ght,V, is suspended. rIhe weights draw the arms I? and pawls back, so that the normal position 'of the arms is indicated by the dotted lines in Fig. 10. The depression of the righthand treadle will cause the ratchet-wheel to be partly turned lfrom the right side toward the front of the machine, and upon thefoot being raised the weight V will draw the pawl back, when the ratchetwheel may be further partly turned by again depressing the treadle. Vhenever the ratchetwheel is turned the vertical shaft Ii is also turned, and this, through the medium of the bevel-gears above and below, effects the turning of the saw, as will be readily understood. By this mechanism the saw may be turned in either direction partly or entirely around while reciprocatin From an arm or hanger, IV, attached to the front of the frame, two grooved rollers, x, are mounted side by side, with their grooved faces confronting each other, as shown in Figs. 1, 2, 3, and 4. These rollers serve as a guide for the upper slidefrod, A'.

I do not claim, broadly, treadles for revolving the gig-saw, as I am aware such have been used in combination before.

Having described my invention, I claim and desire to secure by Letters Patentof the United States- 1. In a gig-sawing machine, the combination of a sliding saw-rod, A', round in cross-section, a grooved roller, x, on each of two sides ofthe rod, with their grooved faces confronting each Other, a wheel, J, through which the sliding rod may move freely endwise without turning, and mechanism, substantially as described, to rotate the wheel and sawrod, as set forth.

2. In a gig-sawing machine, the hereiirdescribed means for revolving the saw while it reeiproeates, consisting of a vertical shaft, L, connected with theyertically-shding saw-rods A' A2, a ratchet-wheel, N, to rotate the shaft, two arms, I), each pivoted by one end to the vertical axis above the ratchet-wheel, and each carrying at its other end a pawl, r, to engage with the ratchet-wheel, a weightconnected with each arm to draw it back, and a treadle connected therewith to draw it forward, as set forth.

In testimony' whereof I affix my signature in presence of two witnesses.

FRIEDERIOH SCIIAEFLE.

Witnesses Gmo. MCGAFFRAY, L. H. ROBINSON.

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