Year: 1888

page_text: Date of Application, 7th Jan., 1888
Specification Accepted, 10th Feb., 1888
I, WILHELM HASSEL of Hagen, Westphalia, Germany, Engineer, do hereby
declare the nature of this invention and in what manner the same is to bo
performed to be particularly described and ascertained in and by the following
statement:
My invention relates to an improved construction of atmospheric hammer which I
will proceed to describe with reference to the accompanying drawings, in which Fig. 1
shews a sectional side elevation, Fig. 2 a sectional plan and Figs. 3 and 4 details.
The hammer consists of a frame T with driving shaft having fast and loose
pullies ss and fly wheel p, anvil a and guides f, between which works the bell
connected to the crank plate of the shaft and carrying with it the hammer block b
fitting as accurately as possible therein. At each upward stroke of the bell g the
hammer is carried up within it by suction, and at the downward stroke it is forcibly
thrown downward thereby. Fig. 1 shews the cross section of the bell g detached; it
may be of any desired configuration, that shewn being employed as affording means
for obviating inaccurate fit due to wear in course of time, the bell being made in two
halves which can be adjusted for wear.
In order to give this hammer a variable lift and blow, an opening o is formed in the
bell g against which bears a closely fitting bar t which is prevented from moving up
and down in the frame by guiding studs d d and from shifting laterally by working
in a groove in the bell.
By means of the pedal lever rod i and cam k on the latter, the bar t can be pressed
against the opening o, the cam k being made to bear with its incline against the
roller on the end of one of the studs d, a helical spring serving to press the bar t
away from the opening o on the release of the lever x, a counter weight on which
causes the rod i with cam k to be then pushed upward again.
The pedal lever x is at the same time so connected to the belt fork of the fast and
loose pullies, that when the opening o is closed, the belt is upon the fast pulley, and
when it is open the belt is on the loose pulley, so that a variable lift and blow is
obtained by this means, the hammer being capable of striking quick and strong or
slow and weak blows.
The modification shewn in side elevation and sectional details at Figs. 5, 6 and 7,
is generally of the same construction as above described, the bell being in this case

page_text: made to constitute the hammer block b, in which is a piston g that alternately effects
the upward motion of the bell b, by suction and the downward propulsion thereof.
The communication between the space under the piston and the atmosphere is in this
case effected through the opening o in combination with the passage of opening o² and
valve which is opened and closed by the weighted treadle lever and rod i, the
action being otherwise the same as above described.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. In an atmospheric hammer the combination of a longitudinally divided recipro-
cating bell g with a hammer block b sliding therein and so arranged that on moving
upwards the hammer block is carried up within the bell and on moving downwards it
is thrown downward thereby, substantially as herein described.
2. In an atmospheric hammer constructed as set forth in the preceding claim,
governing the motion of the hammer block by means of pedal lever mechanism
whereby the space in the bell g over the hammer b is, at will, either closed or made to
communicate with the outer air by means of the opening o and bar t, while at the same
time the bolt is shifted either on to the fast pulley or on to the loose one, the action
being such that when the opening o is closed the hammer gives quick and strong blows,
while when it is periodically uncovered the hammer gives slow and weak blows,
substantially as herein described.
Dated this 7th day of Tann 1000
ABEL & IMRAY,
Agents for the Applicant.