US510619A - Machine - Google Patents

Description

(No Model.) 5 Sheets- Sheet 1.

D. 0. STOVER su?. W. HOHER.

HACK SAWING MAHIN'E.

Y. 110.510,619.` Patented DeoLlZ, 1893.

(.1510 Model.) 5 sheets-sheet 2.

11.0. STOVER au P. W.110E1ER.

I HACK SAWING MACHINE.

' 1111.511619. Patented 1160.12, 1893.

5 Sheets-Sheet 3.

(NO Model.)

' D. C. STOVER 8u P. W. HOEFE HACK SAWING MACHINE.

PatentedDeo. 12, 1893.

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(No Mode1.) 5 Sheets-Sheet 4.

D. C. STOVER 8v F. W. HOEFER. HACK SAWINGMAGHINE.

No. 510,619. y Patented De0.12, 1893.

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(.No Model.) 5 Sheets-'Sheet 5.

n. o. STOVER a F. W. HOEFER.

HACK SAWING MACHINE.

lvm-510,619. 1 Patented 1360.12, 1893.

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UNITED STATES PATENT OFFICE.

DANIEL C. STOVER AND FREDERICK VV'.v HEFER, OF FREEPORT, ILLINOIS, ASSIGNORS -TO THE STOVER NOVELTY WORKS, OF SAME PLACE.

HACK sAwlNG-MACHIN'E.

SPECIFICATIONformng part of Letters Patent No. 510,619', dated December `12, 1893.

Appncntiontiedrama-ym,1893. sentire. 465,536. cromati.)

.To a/ZZ whom it may concern:

Be it known that we, DANIEL C. STOVER and FREDERICK W. HOEFER, both citizens of the United States of America, and both residing at Freeport, in the rcounty of Stephenson and State of Illinois, have jointly invented certain new and useful Improvements yin Hack Sawing-Machines, of which the following is a specification.

Our invention relates to improvements in hack-sawing machines, that is to say, niachines in which a hack-saw blade adapted to saw metal is held in a suitable frame'to which reciprocal motion is imparted by power actuated mechanism.

The invention is fully described and eX plained in this specification and shown in the accompanying drawings, in which- Figure 1 is a top plan of a machine embodying our invention. Fig. 2is a side elevation thereof looking in the direction indicated by the arrow, ac, Fig. 1, the saw frame and blade being in their lowest operating position.

Fig. 3 is a similar view of the machine, the saw frame and blade being lifted up out of operating position and certain parts being removed to show construction. Figt is an end elevation of the machinelookingin the direction indicated by the arrow, x', Fig. 2. Fig. 5 is a vertical section of the bed and certain parts immediately connected therewith, the plane of section being through the line 5-5, Fig. 3. Fig. 6 is an elevation of the rocking lever, H, and the yoke, H', formed integral therewith, the view being in the direction indicated by the arrow, w3, Fig. 1, and the lever being in its raised position. Fig. 7 is a side elevation of the lever, H4, interposed between the arm, H2, of the yoke andthe hub of the driving pulley, W, the view being in the direction indicated by the arrow, m2, Fig. l.

In the views, A is a bed of suitable size and form provided with legs, A', and having on its upper face a stationary work-holdin g jaw, ct, preferably integral with it. A suitably guided sliding jaw, 0,', parallel to the jaw, ct, co-operates with it and is adjusted by means of a screw, S, provided with a hand-wheel, w, the two jaws being adapted to clamp between them a bar or other piece of metal to be operated upon by the machine. Beneathl the upper surface of the bed and at right angles to the line of .motion of the jaw, ot', is a shaft, B, journaled insuitable bearings, b, b', and Vprovided at one end with a crank plate, C, having a crank pin, c.

At the' rearend of the machine is a lever, L, pivoted at itslower end to the frame of the machine in the manner illustrated in Fig. 4, in which, L', is a transversely extending head 6o integral with the lever and lying between suitable ears formed on the legs of the machine, the head and the ears being pivoted together by cone bolts as fullyshown in the figure. The upper end of the lever is provided with a transverse head, L2, terminating in ears which embrace a head, C', formed on the downwardly turned rear end of the main member or backbone, D, of the reciprocating saw-frame. The member, D, is formed with two down- 7o ward extensions, D', D2, adapted to receive, support and suitably tighten a saw-blade, E, suitable for sawing metal. The crank pin, c, of the. plate, C, is connected by means of a pitman, P, with a point on the backbone, D, 7 5 situated approximately at the rear end of the straight portion thereof, and at its junction with the downward extension which is jointed to the upper end of the lever, L. Between suitable ears at the rear end of 8o the bed is pivoted the transverse head, F', of a forwardly extending lever, F, provided at its front end with an enlargement, f, vertically bored to receive an adjustable guide, f this guide being held in place by a suitable S5 set screw and its lower end being slotted to embrace and ride upon the saw-blade. The length of the lever, F, is such that this guide has a substantially vertical movementso that while it follows the vertical movement of the 9o saw-blade, its position in the line of the length of the machine remains always practically the same. It therefore furnishes an operative and automatically adjusting guide for the saw-blade in every possible working position. It is evident that the rotation of the shaft, B, and crank plate, C, must oscillate the lever, L, and impart longitudinal reciprocation to the saw-frame and saw; that the connection ofthe saw-frame and lever, L, roo is such'as to permit the raisingand lowering of the saw to accommodate itself to sawing of bars of different diameters and that the guide, F, f, f must continually preserve the alignment of the saw and brace it against lateral strains. Furthermore, all the pivotal supports and connections of the parts thus far described, are of such forms as to insure lateral rigidity and hold the saw-blawde constantly in the same vertical plane. The position of the pivot connecting the rear end of the pitman with the backbone of the saw, is such that the forward movement of the crank pin, c, tends not only to draw the saw forward, but downward as well, and, on the contrary, the backward movement of the crank pin tends to lift the saw as well as to push it backward. The consequence of this construction is, therefore, to increase the downward pressure of the saw-blade in its forward stroke and decrease it in its rearward stroke. The pressure thus produced will frequently be found suflicient, but we have sometimes found it desirable to still further increase the pressure by placing upon the backbone of the saw a weight, K, having in its lower face a longitudinal slot adapted to embrace the backbone and slide longitudinally thereon. The weight may be retained in any desired position on the backbone by means of lugs formed in the upper face of the slot and engaging notches in the upper edge of the backbone as clearly shown in Fig. 3.

Near the end of the shaft, B, opposite the crank-plate, C, is loosely mounted a driving wheel, W, provided with a lug, Z, formed on the outer end of its hub and engaging an oppositely placed lug, Z, formed on the inner end of a sleeve, G, which is mounted upon and secured to the shaft, B. When the lugs, Z, Z, are in engagement as shown in Fig. l, the rotation of the wheel, W, in the direction indicated by the arrow on its face in Fig. l, rotates the shaft, B, in the same direction and operates the saw-frame and saw in the manner hereinbefore described. Within the sleeve, G, however, lies a coiled spring, s, which tends to press the wheel away from the sleeve and thus to prevent the engagement of the two lugs and the transmission of motion from the wheel to the other working parts of the machine. The means by which the force of the spring may be overcome and the machine thus rendered operative at will, are shown in the drawings, H being alever lying in the vertical plane of the saw-frame and pivotally connected with the shaft, B, by means of a yoke, H', and arms, H2, H2, the ends of the arms being loosely mounted on the shaft so that the entire device may swing freely aboutit within the limits indicated in Figs. 2 and 3, which show the lever, H, in its lowest and highest positions respectively. The inner end of the arm,H2, lies against the outer face of the bearing, h, in which the shaft, B, is journaled; and the inner face of the arm is formed with a projection, h, adapted to lie within a corresponding recess in the outer face of the bearing lug, b, as shown in Fig. 5, when the lever, H, is raised, but to lie outside the recess and against the general face of the bearing lug, as shown in Fig. l, when the lever, H, is depressed, the outer face of the arm, H2, being evidently farther from the crank-plate, C, `when the lever, H, is in its lowest position than when it is raised. Between the outer face of the arm, H2, and the inner end of the hub of the wheel, W', lies the end of the approximately horizontal member, H5, of a bell-crank lever pivoted at its angle to the bed of the machine, the other member, H, of the lever being extended above the bed of the machine and being approximately vertical. The end of the member, H5, is enlarged and formed with aslotembracing the shaft, B, the walls of the slot being arcs having the pivot of thelever as a center. On the outer face of the ,enlarged end of the lever and at the upper end of the slot therein is formed a projection, h4, which increases the thickness of the slotted portion of the arm at that point. On the margin of the slotted portion of the lever is formed a lug, h5, adapted to engage a lug, h6, formed on the outer face of the arm, H2, as shown in Figs. 6 and 7. The lugs, h5, h6, are so placed that when the lever, H, is raised to its highest position, as shown in Fig. 7, it raises the slotted end of the lever, H4, H5, to the position also shown in said figure. When the parts, H2, H5, are in this position, the inner end of the hub of the wheel, W, is at its farthest limit of movement away from the sleeve, G, on the shaft, B, and the lug, Z, of the hub is wholly out of engagement with the lug, Z', on the sleeve. The dropping of the lever, H, increases the distance of the outer face of the arm, H2, from the crank plate, C, and thus pushes the slotted end of the lever, H4, H5, and the wheel, W, toward the sleeve, G, though not sufliciently to bring the lugs, Z, Z', into engagement. The swinging forward of the upper end of the lever, H4, swin gs its opposite slotted end downward and brings the thickened portion thereon between the arm, H2, and the hub of the wheel, thus forcing the wheel outward and bringing the lugs, Z, Z, into engagement. By the means thus described, the wheel, W, may be connected with or disconnected from the shaft, B, at pleasure, without stopping the rotation of the wheel. The bed is provided with a lug, h2, adapted to support the lever, H, when in its lowest position, and the lever is provided with a handle, h2, by which it may be raised so that the machine may be rendered operative or inoperative as desired.

In a machine of this class, it is very desirable that upon the completion of the sawing of a bar or other piece of metal, the sawing mechanism shall be automatically thrown out of operation, and in this machine, as shown in the drawings, this function is provided for by forming on the lower end of the arm, D2, of the saw frame, a lug, cZ, adapted to engage the free end of the lever, H, when.

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the saw frame drops below its lowest working position, that is, when it has completed the sawing of a bar and is no longer supported thereby. This engagement takes place at the end of the first stroke of the saw-frame after its work is completed, and at the next backward stroke the lever is lifted to the position shown in Fig. 3, thereby lifting the saw-blade completely above the bar on which it has been at work, and, at the same time, breaking the engagement betweenthe lugs, Z, Z', and disconnecting the wheel, W, from the shaft, B. The raising of the lever thus stops the motion of the saw, and, at the same time, brings it into such a position that the bar already operated upon may be readily removed or adjusted to b'e again operated upon.

The wheel, W, and Sleeve, G, may, if desired, be so placed that the oscillation of the lever, H, with its arms, H2, H3, shall be suflicient to throw the pulley hub into and out of engagement with the sleeve without the interposition of the lever, H4,-H5, but we prefer to construct the machine as shown, since it is frequently convenient to depress the lever, H, and drop the saw-frame and saw down to their working position without bringing the wheel, W, into connection with the shaft.

Having now described and explained ourv invention, what we claim as new, and desire to secure luy-Letters Patent, is

l. In a machine of the class described, the combination with a suitable bed, a shaftjournaled therein, and a pulley loosely mounted thereon,of a longitudinally reciprocating saw'- frame adapted to support a saw, means connecting the saw frame and the shaft whereby rotation of the shaft operates the saw-frame and a lever supported by the bed and capable of limited oscillation, said lever when at one limit of its motion being adapted to effect the disengagement of the shaft and pulley,'and, at the same time, to lift the saw-frame wholly above its range of working position; substantially as shown and described.

2. The combination with the bed, A, and shaft, B, of the pulley, W, loosely mounted on the shaft and adapted to engage a lug rigidly fastened to the shaft, the lever, H, provided with means substantially as shown and described for moving the pulley longitudinally on the shaft, and the oscillating sawframe, D, provided with a lug adapted to engage the free end of the lever, H, the motion of the frame when said lug and lever are in engagement being adapted to swing said lever and thereby to disengage the pulley, W, from the shaft and at the same timeV to raise the saw-frame above its highest working position. v

3. The combination with the bed, A, and the shaft, B, of the pulley, W, loosely mounted on the shaft, the sleeve, G, rigidly mounted on the shaft and provided with means for engaging the pulley, the lever, H, provided with means substantially as shown and described for changing the position of the pulley, the lever, H4, H5, and the oscillating saw frame, D, provided with the lug, d, adapted to engage the free end of the lever, H, the motion of the frame when said lug and lever are in engagement being adapted to swing said 1ever and the lever, H4, H5, and thereby to disengage the pulley, W, from the sleeve, G, and, at the same time, to raise the saw-frame above its highest working position; substantially as shown and described.

4. The combination with the bed, A, the shaft, B, the crank plate mounted on the shaft and provided with a crank pin, and means for rotating the shaft, of the approximately `vertical oscillating lever, L, pivoted at its lower end to the frame of the machine, the

approximately horizontal saw-frame, D, pivoted at its rear end to the lever, L, and the pitman, P, pivoted at one end to the sawframe and at its opposite end to the crank pin on the crank plate; substantially as shown and described. y

5. The combination with the bed, A, and its supports, the shaft, B, journaled therein, the crank plate, O, the crank pin, c, mounted on the shaft and means for rotating the shaft, of the approximately vertical lever, L, pivoted at one end to the frame of the machine, the saw-frame made up of the back-bone, D, downwardly extending arms, D', D2, adapted to support a saw-blade and a third extension at its rear end pivoted to the free end of the lever, L, and the pitman, P, pivoted at one end on the crank pin, c, and pivoted at the other end to the saw-frame; substantially as shown and described.

DANIEL C. STOVER. A ,y FREDERICK W. HOEFER.` Witnesses:

L. HUGHES, G. B. YOUNG.

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