US788547A - Power-hammer. - Google Patents

Description

No. 788,547. PATENTED MAY 2, 1905.

` 0. P. MIKLEBUST 6a A. G. ANDERSON.

POWER HAMMER.

APPLIUATION FILED JULY 29, 1904.

Z SHEETS-SHEET 1.

Say/H Witnesses w Z/ LMUIV b9 1 entera Httornegs No. 788,547. l PATENTED MAY 2, 1905. 0. P. MIKLEBOST L A. G. ANDERSON.

POWER HAMMER.

APPLIOATION FILED JULY 29. 1904.

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5f and A771@ 1 ""lfl Inventrg ttomegs UNITED STATES Patented May 2, 1905.

PATENT OEEICE.

OLE P. MIKLEBOST AND ANTON G. ANDERSON, OF BROWN VALLEY, MINNESOTA.

POWER-HAMMER.

SPECIFICATION forming part of Letters Patent No. 788,547, dated May 2, 1905.

Application filed July 29,1904. Serial No. 218,783.

vANTON G. ANDERSON, citizens of the United States,1esiding at Brown Valley, in the county of Traverse and State of Minnesota, have invented a new and useful Power-Hammer, of

which the following is a specification.

This invention relates to metalworking machines, and is designed to provide an improved power-hammer capable of being convenieutly thrown into and out of action and also capable of adjustment to vary the stroke of the hammer in accordance with the work in hand.

Another object of the invention is to have each element of the machine separately controllable, so as to be thrown into and out of operation at will and to provide for the necessary adjustments to accommodate the machine to the work.

l/Vith these and other objects in view the present invention consists in the combination and arrangement of parts, as will be hereinafter more fully described, shown in the accompanying drawings. and particularly pointed out in the appended claims, it being' understood that changes in the form, proportion, size, and minor details may be made within the scope of the claims without departing from the spirit or sacrilicing any of the advantages of the invention.

In the drawings, Figure 1 is a perspective view of a metal-working machine constructed in accordance with the present invention. Fig. 2 is a longitudinal sectional view thereof. Fig. 3 is a cross-sectional view on the line 3 3 of Fig. 2. Fig. 4 is a detail cross-sectional View on the line 4 4 of Fig. Q. Fig. 5 is a detail perspective view of a trip-hammer head and a die for cooperation therewith. Fig:I 6 is afragmentary perspective View of one corner of the bed of the machine to illustrate the guideway for the work-holder of4 the tubecutter.

Like characters of reference designate corresponding parts in each and every figure of the drawings.

The operating parts of the present machine are mounted upon a frame which includes a skeleton bench or table-top 1, which is open throughout its longitudinal center and supported at its rear end upon leg-standards 2 and 3, while its front end is supported upon a single leg-standard 4, located substantially midway between the opposite longitudinal sides of the table-top or bed of the machine.

A vertically-swinging hammer-bar 5 is mounted above the longitudinal center of the bed of the machine and has its rear end fulcrumed upon a yoke-shaped bracket 6, the stem 7 of which slidably pierces the rear portion of the top of the bed at the inner side of the upstanding back portion 8 thereof and is provided with a longitudinal slot 9, through which projects a clamping-bolt 10, carried by the back 8 of the bed, whereby the bracket is capable of being adjusted vertically to accommodate the hammer-bar to the work in hand. The front free end of the hammer-bar projects a suitable distance in front of the bed of the machineand carries a hammer-head 11, which is provided with an opening to receive the hammer-bar, and carries a set-screw 12 to adjustably and detachably hold the hammerhead upon the bar. One end of this hammerhead is concaved, as at 13, for use in scariing the end of a tube, while its opposite end is enlarged, as at 14, and concaved for use in swaging a scarfed joint. It will therefore be understood that it is necessary to invert the hammerhead to bring its opposite ends into alternate use, and therefore it is preferred to have the free extremity of the hammer-arm rounded or in the nature of a spindle, as indicated at 15, in order that the hammer-head may be rotated upon the bar to bring either end into position for use, thereby to obviate the removal of the hammer-head when inverting the same. A cylindrical mandrel or anvilbar 16 is disposed in longitudinal alinement below the free end of the hammer-bar and has its rear end portion dovetailed in crosssection and litted endwise into an open-ended .dovetailed groove or seat 18 in the top of the front end of the bed, whereby the mandrel is rigidly and detachably held in place. ln rear of the mandrel or anvil there is an upstanding slotted guide-bar 19, which is secured to the back of the front portion of the bed and has the hammer-bar working in the slot thereof to guide the same and obviate lateral play.

In addition to the scarfing and swaging hammer-head 11 there is another hammerhead 2O of the ordinary type which may be substituted for the hammer 11, in which event the anvil or mandrel 16 is substituted by the die-block 21, which has a dovetailed stem 22 to lit in the dovetailed seat 18 of the bed of the machine. Vhen the ordinary hammerhead 20 and the guide-block 2l are employed to use the device as a trip-hammer the hammer-bar should be shifted rearwardly through the bracket 6 and fulcrumed thereon at the opening 23, formed through the bar, and the bracket should also be elevated to a suitable extent so as to obtain a greater throw of the hammer-bar than is necessary in scariing and swaging a tube.

Power is applied to the hammer-bar from a drive-shaft 24, which has its forward end journaled in the back of the front leg-standard 4, with its rear end journaled upon and projected rearwardly beyond a suitable crossbar 25, extending across the lower portions of the .rear leg-standards. A drive-pulley 26 is fixed upon the shaft intermediate of its ends and is designed to be driven from any suitable source of power. (Not shown.) In front of the pulley there is a sleeve 27, loosely mounted upon the shaft and provided with a longitudinal feather or key 28. A clutch member 29 is mounted to slide upon the feathered portion of the sleeve into and out of engagement with the adjacent clutch-face of the pulley, so as to interlock the sleeve therewith for simultaneous rotation with the shaft. The movable clutch member 29 is governed by an upright swinging arm 30, having its lower end provided with a fork 31, engaging the groove 32 in the clutch member, the upper end of the arm being connected to a rock-bar 33, journaled across the bottom of the bed and provided at one end with a crank-arm 34. Below the crank-arm is a treadle 35, which has its rear end fulcrumed upon the cross-bar 25 at the back of the machine, with its front free end projected in front of the bed, so as to be in position to be conveniently controlled by the foot of an operator standing at the front of the machine. A link or rod 36 connects the crank-arm and the treadle, and a spring 37 extends between an intermediate portion of the lever and the bottom of the bed to yieldably hold the treadle in an elevated position with the clutch member 29 out of engagement with the drive-pulley, thereby to render the sleeve 27 normally inactive. In front of the clutch member 29 there is an eccentric 38, carried by the sleeve 27 and embraced by an eccentric-strap 39, from which rises a screw-threaded rod 40. A cross-head 41 is slidably mounted upon the intermediate Screw-threaded portion of the rod 40 and is adjustably clamped thereon by means of a pair of nuts 42, carried by the rod at opposite sides of the cross-head, whereby the latter may be adjusted vertically upon therod. The upper extremity of the rod is smooth and loosely pierces a cross-bar 43. A cross-head 44 is carried by the hammer-bar and is adjustable longitudinally thereon through the medium of the clip 45. At opposite sides of the hammer-bar and the rod 40 are guiderods 46, which loosely pierce the corresponding terminals of the two cross-heads and the slidable cross bar 43, there being upper springs 47 embracing the rods and interposed between the upper cross-head 44 and the nuts 48 upon the tops of the guide-rods, intermediate springs 49 being interposed between the upper cross-heads and the slidable bar 43 and lower springs 50 interposed between thelower cross-head 41 and the slidable bar. Nuts 51 are fitted to the lower ends of the guide-rods 46 beneath the cross-head 41. By this construction a vertically-swinging movement 1s imparted to the hammer-bar from the driveshaft, and the hammer-bar is effectually cushioned through the medium of the springs provided upon the guide-rods 46. The tension of the springs may be conveniently regulated by adjustment of the nuts 48 and 51. To adjust the throw of the hammer-arm, the eccentric 38 may be adjusted longitudinally upon the sleeve 27 and is provided with a setscrew 52 for this purpose.

At one side of the hammer-bar, preferably the right-hand side thereof when looking at the front of the machine, are horizontallydisposed and vertically-alined rotatable mandrel- bars 53 and 54, extending longitudinally across the top of the bed and journaled at their rear ends in vertically-spaced bearings 55 and 56, with their rear extremities projected beyond the bearings and provided with meshed gears 57 and 58, the rear end of the lower roller or mandrel having a pulley or sprocket-wheel 59. A belt or sprocket-chain 60 engages the sprocket 59 and extends downwardly to a sprocket 61, loose upon the driveshaft 24 in rear of the drive-pulley 26 and provided with a clutch member 62 for en-` gagement by a slidable clutch member 63, mounted upon the shaft. This clutch member is controlled by a vertically disposed swinging arm 64, hung from a rock-shaft 65, which is provided at its outer end with asubstantially horizontal crank-arm 66. Beneaththe arm 66 there is a treadle 67, fulcrumed at its rear end upon the adjacent rear leg-standard and connected to the arm 66 by a link or rod 68, there being a spring 69 connected to the treadle and the bed of the machine to yieldably hold the treadle elevated with the slidable clutch member 63 out of engagement with the clutch 61, whereby the rollers 53 and 54 are normally inactive. In front of the crank-arm 66 is a lever 70, lying beneath the IOO IIO

yoke 73 and is capable of being drawn downy vcrank-arm 66 by a lin`k bed of the machine and fulcrumed thereto at its forward end, as indicated at 71, the rear free end of the lever being connected to the 72. A yoke 73 straddles the rollers 53 and 54 and the adjacent portion of the bed of the machine, the lower extremities of the sides of the yoke each being pivoted to the lever 70, as indicated at 74. The upper end of the yoke constitutes a bearing 75 for the forward portion ot' the upper roller 53, while the lower roller -54 is supported in a stationary bearing 76, carried by the bed with its ends projected at the outer and inner edges of the bed and each provided with an upstanding groove 77, constituting a guideway for the adjacent member of the yoke. From this description it will be understood that the upper roller 53 is normally supported at its upper limit through the medium of the spring 69, the lever 70, and the into coperative relation with the lower roller 54 by the manipulation of the treadle 67 to obtain the desired pressure and to accommodate the rollers to tubes of diiferent sizes, which are designed to be Iitted upon the outer free end of the lower roller and rolled between the two rollers. The swinging movement of the upper roller 53 is comparatively slight and is permitted by a suitable looseness of the roller in its rear bearing 55. It will here be noted that the rollers 53 and 54 are thrown into rotation and the upper roller drawn down into cooperative relation with the lower roller simultaneously by the manipulation of the treadle 67, which materially simplifies the controlling of these rollers.

rlhe tube-cutting means is supported upon the top of the bed of the machine at the opposite side of the hammer-bar and includes a roller or spindle 78, journaled in an intermediate bearing 79 and a rear bearing 80, carried by the top of the frame. 'lhis mandrel or roller projects in rear oi the bearing 80 and is provided with a pulley or sprocket 81, from which leads an endless belt or sprocketchain 82 to a terminal sprocket 83, loosely7 carried by the rear extremity of the driveshaft and capable ot' being {ixed thereon by a movable clutch member 84. The clutch member 84 is controlled by an upright swinging arm 85, hung from a rock-shaft 86, journaled upon an upper cross-bar 87, extending' between the rear leg-standards of the frame of the machine. The outer end o1 the rockshat't 86 is provided with a substantially hori- `zontal crank-arm 88, projected forwardly bethere being a spring 93 connected tof the treadle and also to the bed of the machine to yieldably support the treadle in an elevated position, and thereby hold the clutch 84 out of engagement with the sprocket 83, so as to render the spindle or mandrel 78 normally inactive. Above the treadle 90 is a lever 94, fulcrumed intermediately, as at 95, to the bed oi' the machine, with its rear end connected with the crank-arm 88 by a link 96. rlhe forward end of this lever is connected to the upright shank or stem 97 of a yoke-shaped bracket 98, which carries a pair of parallel antifriction-rollers 99, 'with the intervals between the rollers alined beneath the forward end o'f the mandrel 78, which carries the cutting-disk 100. The bracket-98 normally rests within a seat or depression 101 in the front portion of the bed oi the machine, and the crank or stem 97 has beveled longitudinal edges to fit in an upright dovetailed groove or guideway 102, formed in the front end of the bed and intersecting the seat 101, so as to prevent lateral displacement ot' the bracket. A 'set collar 103 adjustably embraces the mandrel 78 and is provided with a set-screw 104 to adjustably tix the collar thereon, whereby the extent of the insertion ot' the cutter end of the mandrel into a tube may be regulated by adjustment of the set-collar, which forms a stop for engagement by the front end of the tube to be cut.

From the foregoing description it will be noted that the tube-rolling mandi-els, the mandrel or anvil of the hammer, and the tubecutter are all accessible at the l'ront olE the machine and are individually controllable from the front of the machine through the mediumbt' the treadles, which are accessible to a workman working at either of the devices. Each of the tools is controllable independently of the other, and all three of them may be in operation at the same time.

Having thus described the construction and operation of our invention, what we claim as new, and desire to secure by Letters Patent, 1s-

1. In a metal-working machine, the combination with a frame, of a drive-shaft carried thereby, a hammer-bar fulcrunied upon the frame, an eccentric carried by the shaft, an eccentric-strap, a connecting-rod rising from the strap and provided with a lower crosshead and an Lipper slidable cross-bar, acrosshead carried by the hammer-bar, guide-rods connected to the cross-head of the rod and loosely piercing the slidable cross-bar and the cross-head of the hammer-bar, and springs interposed between the lower cross-head and the slidable cross-bar, the slidable cross-bar and the cross-head of the hammer-bar and above the latter cross-head, and nuts upon the upper ends of the guide-rods to vary the tension of the springs.

2. In a metal-working machine, the combi- TOO nation with a frame, of a drive-shaft mounted thereon, a hammenbar ulcrumed upon the frame, an eccentric upon the shaft, an eccentric-strap, a connecting-rod rising from the strap, corresponding cross-heads carried by the connecting-rod and the hammer-bar respectively, guide-rods carried by the crosshead of the connectingrod and working loosely through the cross-head of the hammerbar, springs embracing the guide-rods between the cross-heads and also above the upper cross-head, and means to vary the tension of the upper springs.

V3. In a metal-working machine, the combination with a frame, of adrive-shaft mounted thereon, a hammer-bar fulcrumed upon the frame, an eccentric upon the shaft, an eccentric-strap, a connecting-rod rising from the strap, cross-heads carried by the connectingrod and the hammer-bar, guide-rods carried by the lower cross-head and loosely piercing the upper cross-head, springs embracing the rods below and above the upper cross-head, and a stop for the upper ends of the upper springs.

4. In a metal-working machine, the combination with a frame, of a drive-shaft carried thereby, a hammer-bar fulcrumed upon the frame above and in substantial parallelism with the shaft, an eccentric adjustable longitudinally upon the shaft, an eccentric-strap, a connecting-rod rising from the strap, and means adjustable longitudinally upon the hammer-bar and connected to the connectingrod to vary the throw of the hammer-bar.

5. In a metal-working machine, the combination with a frame, of a drive-shaft mounted thercon,avertically-adjustable bracketcarried by the frame above the shaft, a hammer-bar fulcrurned upon the bracket in substantial parallelism with the shaft, an eccentric adjustable longitudinally upon the shaft, an eccentricstrap, a connecting-rod rising from the strap, a cross-head adjustable longitudinally upon the connecting-rod, a cross-head adjustable longitudinally upon the hammer-bar, and connecting means extending between the two cross-heads.

In testimony that we claim the foregoing as our own we have hereto ailiXed our signatures in the presence of two witnesses.

OLE P. MIKLEBOST. ANTON Gr. ANDERSON. Nitnessesz WM. H. NELSON, A. I. ENGEBRETSON.

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