Year: 1892

page_text: Date of Application, 11th Oct., 1892-Accepted, 25th Mar.,, 1893

page_text: latch 16, adapted to engage a toothed rack 15* and hold the lever in a desired
position.
The arm 22 of the double crank is slotted near its free end, as shown at 26, so
as to permit the necessary play of the pin connecting it with the sliding plate 20,
and the crank is braced by a brace 24, pivoted to the inner side of the disk at a
point opposite the upper end of the lever 24, the lower end of the brace being
secured to the crank pin. The disk is slotted, as shown at 27, to permit the
necessary movement of the crank 23 and lever 24. The inner arm 28 of the
double crank 23 extends rearward in a direction opposite to that of the arm 22 and
connects with a depending arm 29 on the helve 30, which helve is pivoted centrally
on, the elongated hub 13 of the disk 13 and has at its front end two vertically
aligning guide pieces 31, between which is a strong flat spring 32, one end of which
is rigidly secured in the front end of the helve 30 and the opposite end of which is
attached to a segmental plate 33, the arms 34 of which are pivoted on the hub 13"
and shaft 11, as best shown in Figs. 4 and 5. In front of this segmental plate 33 is
a vertically sliding head 35, which moves in a slideway formed in the uprights 36
of the main frame, and this head carries the hammer or die 37. The head 35 and
segmental plate 33 are connected by means of straps 38, the middle one of which
is secured at its upper end to the top edge of the head and at its lower end to the
lower edge of the plate, and the other two straps have their upper ends secured to. 2
the upper edge of the plate and their lower ends secured to the bottom edge of
the head. This attachment permits of a frictionless movement of the segment.
and head in relation to each other as the straps will alternately be wound and.
unwound; but instead of connecting the parts by means of straps, chains, gears, or
other suitable means may be employed for moving the head by the movement of 2
the segment. Beneath the laminer 37 is the lower die or anvil 39 and the material
to be operated upon is placed upon the lower die or anvil, so as to receive the blows
from the hammer above.
On the rear end of the helve 30 is a counterbalancing weight 40, which is
adapted to counterbalance the hammer 37 and which may be adjusted longitudinally
upon the helve 30. It will thus be seen that the hammer may be exactly balanced
or the weight may be adjusted so that the hammer will move down or up with
greater or less force, as desired.
The operation of the machine is as follows..
The machine is first. adjusted so that the hammer 37 will be normally at a desired 3
distance above the anvil 39 by means of the handle 14. This is done by merely
moving the handle backward or forward, as the movement of the handle turns the
disk and causes it to move the crank 23, and thus raise or lower the rear end of the
helve 30, as tho case may be, and so bring the hammer into a desired position.
The machine is then started and the rotary movement of the shaft 11 and crank 4
plate 17 causes the connecting rod 19 and slide plate 20 to move up and down,
and the movement of the slide plate oscillates the crank 23, and consequently tilts
the helve 30, which movement of the helve moves the segmental plate 33, by
means of the spring 32, and thus raises aud lowers the hammer head 35 and
hammer 37 and the spring connection between the helve and segment causes an 4
elastic blow to be struck. To change the stroke of the hammer the lever 24 is
moved backward or forward, so as to move the crank 23 into a desired position
in the slot 27, and it will be readily understood that the stroke will vary, according
as tho crank is pushed into the slot or near the open end of the same, as the inner
end of the slot is much nearer the centre of the disk than the outer end. The 5
lever: 24 may be moved easily and with safety while the machine is in operation,
and, as a result, the hammer may be made to deliver powerful strokes during the
early stages of an operation, and the strokes may be gradually diminished in power
until they may be as light as desired.
It will be noticed that the main disk, the helve, and the main operating parts of 5
the machine are mounted on a cominon shaft, and as a result the hammer may be
made to deliver a blow in any direction by simply changing the shape of the frame

page_text: and the direction of the slideway of the hammer, consequently the machine is well
adapted to be mounted on a tripod and operate a drill.
In a modification of my invention I construct the hammer in the following
manner constituting an improved means for locking up the head at any desired
point.
Two racks 41, one on each side of the hammer head are adapted to receive one
of the catches 42. These catches are secured to revolving upright bars 42ª which
are adapted to be operated either by hand or foot power.
I will now describe the manner of operating the upright bars by foot power.
A treadle 43 is pivotally secured to the base of the machine and to this treadle
is connected in any suitable manner a rod 44 which in turn connects to a bell-
crank lever 45 pivoted to the frame of the machine. To one of the revolving.
upright bars is secured in any desired manner an arm 46. By pressing the treadle
down with the foot, motion is communicated to the bell-crank lever through the
rod 44, when the free end of said lever comes in contact with an arm 46 revolving
the uprights which carry the catches and releasing them from the racks 41.
The manner of connecting the upright bars is as follows:
Levers 47 and 48 are securely fastened to the top ends of the uprights and
connection between them is made by a bar or link 49. One or the lever 47 has an
extension which is adapted to come against a flat spring 50 screwed or otherwise
fastened to the upright frame of the machine for the purpose of returning said
revolving uprights and catches to their normal position.
A handle bar or lever 51 is also secured to the upright 47 for the purpose of
operating the machine by hand power.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what inanner the same is to be performed, I declare that what I
claim is
-
1. A power-hammer comprising a disk arranged vertically and made adjustable
around its axis, a plate held and adapted to reciprocate in a slideway arranged on
a face of said disk, a driving shaft arranged at a right angle to the disk, a helve
pivoted on the latter and operating vertically, a hammer fixed on the outer end of
Buch helve, and means for connecting the sliding plate with the helve and also with
the driving shaft, as shown and described.
2. In a power-hammer apparatus, the combination of a pivoted helve, a segment
attached to one end of the latter and having a spring connection with it, a
reciprocating hammer and guides therefor, and straps attached to the segment and
hammer at their respective ends, all operating as shown and described.
3. In a power-hammer apparatus, the combination with the driving shaft, the
hammer and its helve pivoted on the driving shaft, the disk also pivoted on the
shaft and thus inade adjustable around it, of the lever 24, pivoted to said disk and
adapted for adjustment for the purpose stated, means for locking said lever, and
means for connecting it with the hammer helve, substantially as shown and
described, whereby the throw of the hammer may be regulated, as specified.
4. The combination, with the main frame, having a suitable driving shaft
therein, the tilting helve mounted on the shaft, and the hammer connected with aud
operated by the helve, of the disk mounted loosely on the shaft, the slide plate
mounted on the disk and having a crank connection with the driving-shaft, a lever
pivoted on the disk, and a two armed crank journalled in the lever and whose
journal is arranged in a slot in the disk, one arm of the crank being secured to the
slide plate and the opposite arm connected with the rear end of the tilting helve,
substantially as described.
.
5. Hand operating mechanism for power hammers, consisting of levers 47
and 48 securely fastened to the top ends of revolving uprights, said levers being
connected together by a bar or link 49; one or the lever 47 having an extension
adapted to come against a flat spring 50 secured to the frame of the machine, which
spring returns said levers and uprights to their normal position, catches 42 for

page_text: engaging with racks 41 which hold the head in any desired position, and a lever
secured to one of said uprights for operating said mechanism, substantially as
shown and described.
6. Foot power operating mechanism for power hammers consisting of a treadle
pivotally secured to the base of the machine, a rod or bar connecting said treadle
with a bell-crank lever, the free end of said lever being adapted to engage with.
an arm secured on the upright 47, all substantially as and for the purpose set
forth.
7. The improvements in power hammers substantially as and for the purposes
hereinbefore described set forth and illustrated.
Dated this 11th day of October 1892.
REGINALD W. BARKER.