Improvements in Power Hammers.
Year: 1891

page_text: Date of Application, 30th Sept., 1891-Accepted, 21st Nov., 1891
COMPLETE SPECIFICATION.
Improvements in Power Hammers.
I FRANK JACOB SCHMITT of 30 Franklin Street in the City of Newark, New
Jersey, United States of America, Machinist, do hereby declare the nature of this
nvention and in what manner the same is to be performed, to be particularly
lescribed and ascertained in and by the following statement :—
.
The object of this invention is to more readily adjust the length of the drop of
he hammer and to provide simple and reliable means for increasing its power.
The invention consists in the improved power hammer hereinafter described and
he combination and arrangement of the various parts thereof substantially as will
be hereinafter more fully described and finally embodied in the claim. Referring
o the accompanying drawings in which like letters of reference indicate corre-
ponding parts in each of the several figures,
hading this improvement.
I FRANK JACOB SCHMITT of 30 Franklin Street in the City of Newark, New
Jersey, United States of America, Machinist, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of this invention is to more readily adjust the length of the drop of
he hammer and to provide simple and reliable means for increasing its power.
The invention consists in the improved power hammer hereinafter described and
he combination and arrangement of the various parts thereof substantially as will
be hereinafter more fully described and finally embodied in the claim. Referring
o the accompanying drawings in which like letters of reference indicate corre-
ponding parts in each of the several figures,
view of a power homm embodying this improvement
Fig. 2 is a section of the same on line x.
Fig. 3 is a top plan view of the helve.
Fig. 4 is a transverse sectional view of the adjustable bearing on the helve.
Fig. 5 is a rear view of a part of the machine showing the connections between
the driving shaft and the helve, and
Fig. 6 is a vertical central section on line y Fig. 5.
In said drawings A represents the frame of the machine B is an anvil support:
C is a hammer stock: D is a main driving shaft running in suitable bearings in the
frame and carrying a driving pulley (not shown). On the main driving shaft is
formed or rigidly secured thereto an eccentric a with metallic bushing or bearing b.
Surrounding said bushing and eccentric, is an eccentric strap e preferably in two
parts and provided with a yoke extension d shown more clearly in Fig. 5. This
yoke is provided on its upper portion with a shoulder e the shoulder and yoke being
socketed to receive the lower end of a connecting rod f as shown in Figs. 1.5 and 6.
Upon the connecting rod is formed a shoulder g adapted to rest on an elastic
washer on the upper part of the shoulder e, and the lower end of this rod which
projects below and within the yoke is threaded to receive binding and locking nuts
with an elastic washer interposed between the binding nut and yoke.
This rod extends upwards and is pivotally connected with the helve as will be
hereinafter described.
On the top of the rear of the frame is secured in any desired manner a pivotal
connection for the rear end of a forked helve h shown more clearly in Fig. 3. The
forward end of this helve is formed into a flat semi circular spring h, and made
integral therewith as shown in Fig. 1. The outer end of said spring is turned
over or down to form a bearing for a pin i on which is pivoted a shackle; as shown
in Fig. 1. Between the arms of the fork of the helve is arranged a bearing or
block k, the ends of said bearing being formed with downward and upward
extending portions k², k¹ and adapted to surround the arms of the fork and be
reciprocated thereon as shown clearly in section in Fig. 4. Through the centre of
this bearing and the upturned sides and above the arms of the fork is an opening
through which passes a tightening bolt m for adjustably securing the bearing in
position on the arms of the fork of the helve. This bolt in is threaded at one end
to receive a hand tightening nut n.
and
The outer surface of the bearing k is channelled to receive a bushing o as shown
in section in Figs. 4 and 6. Around this bushing o is fitted a rod holder
irmly held thereon by a tightening bolt 7 as shown in Figs. 3 and 6. The forward
end of this holder p is provided with a clamp having clamp bolt r¹ and concave
hreaded recesses which, when the clamp 7 is closed form a threaded socket &
Price &d"

page_text: Figs. 1 and 3 to receive the upper thread of the connecting rod f as shown in
Fig. 1. The extreme upper end of this connecting rod is formed to receive a
wrench to turn the connecting rod in the socket s so that the connection between
the driving shaft and the helve can be increased or diminished as desired.
Upon the sides of the front of the frame A are guide plates t. t. secured thereto
by bolts 6. 6. passing through side flanges 8. 8. on the lower portions of the guides
and the sides of the frame and these plates are provided on their inner edges with
vertical triangular slots as shown in Fig. 2. The hammer stock C is provided on
or near the rear of its sides with vertical angular projections u. u. adapted to fit in
the triangular slots, and in which the hammer stock slides vertically as shown in
Fig. 2. Between the lower side flanges of the guide plates and the frame, pieces
of rubber or elastic material are inserted as shown in dotted lines at w Fig. 2 to
relieve the jarring consequent from the concussion of the hammer.
The frame of the frame A. is vertically recessed as at 9. Fig. 2 in which moves
freely the portion 10 of the hammer stock in the rear of the slide as shown in
section in Fig. 2. The forward ends of the forks of the helve are provided with
elongated slots 2 in which is adjustably secured a pin 3 as shown in Figs. 1 and 3.
Around this pin and extending forward and around the shackle j is adjusted and
arranged a leather band 4. This leather band passes over the top of the hammer
stock and also through an opening 5 in the upper part of the hammer stock the
upper and lower surfaces of this opening 5 being convex as shown in dotted lines
Fig. 1. By my improved connection between the top of the connecting rod and
the adjustable bearing on the helve the rod is not only held firmly in connection
therewith, but at the same time is free to oscillate on the bushing on the adjustable
bearing. When considerable increase or decrease of power is required, the
adjustable bearing on the helve is loosened by the hand nut and moved forward or
backward as may be desired.
But if a slight variation only in the power of the hammer is desired the position
of the adjustable bearing need not be changed and the variation can be effected by
merely turning the connecting rod around in its threaded connection with the holder
in either direction thus slightly increasing or decreasing the length of the connection
between the driving shaft and the helve as desired. By the employment of a
leather band passing over the top of the hammer stock and also through a convex
opening in the stock as shown in Fig. 1 the descent of the hammer is materially
assisted, while by convexing the opening in the stock, the band, the band has a
more even bearing when raising the stock and at the same time the strain on the
band is much less than when the opening is straight. By extending the hammer
stock to the rear of the slides and recessing the frame to allow its free passage, the
hammer stock is more evenly balanced and can move more readily in the guides.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1. In a power hammer means for connecting the driving mechanism with the
hammer mechanism consisting of an eccentric on the driving shaft an eccentric
strap with socketed yoke extension and connecting rod, one end of which is
adjustably secured in the socket in the yoke, the other end being adjustably
connected with the hammer mechanism, substantially as described and for the
purpose set forth.
2. In a power hammer means for connecting the hammer mechanism with the
driving mechanism consisting of an adjustable block bearing on the helve of the
hammer mechanism a rod holder pivotted to said block bearing and provided with
a threaded socketed clamp and a connecting rod, one end of which is threaded and
adapted to enter the threaded socket in said rod holder, the other end being
adjustably connected with the driving mechanism substantially as described and for
the purpose set forth.
3. In a power hammer a forked helve pivoted at its rear end to the top of the

page_text: frame, its forward end being provided with a semi circular spring made integral
therewith, the ends of said spring being connected by an adjustable band forming a
connection with the hammer stock and the rear portion of said helve being
adjustably connected with the driving shaft, all substantially as described and set
forth.
4. In a power hammer the combination with the helve and means for operating
said helve of a semi circular spring made integral therewith or secured thereto a
hammer stock provided with convex surface opening and a flexible band adjustably
connecting the ends of said spring one portion of said band being adapted to rest
on the top of said hammer stock, the other portion being adapted to pass through
the opening in said hammer stock substantially as described and for the purpose set
forth.
Deted this 20th day of Sentember 1891.
BONNE & Co.,
57 & 58, Chancery Lane, London, W.C., Agents for Applicant.