An Improved Exhaust Head for Steam Engines.
Year: 1895

page_text: Date of Application, 16th Mar., 1895-Accepted, 4th May, 1895
COMPLETE SPECIFICATION..
An Improved Exhaust Head for Steam Engines.
We, HUBERT PRIGGE and OTTO AM ENDE, Proprietors of the Firm of Ingenieur
am Ende, of 44 Kaiser Strasse Halberstadt, Germany, Engineers, 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 present invention consists of an exhaust head for steam engines, which
differs from the heads hitherto employed in that it allows the steam exhaust free
egress, whilst the tapering exhaust heads which are usually employed, offer a
certain amount of resistance to the escaping steam. The object of the tapering
exhaust heads is as is well known to increase the draught in the chimney. By means
of the present invention the increased draught is attained by imparting to the
exhaust steam as it leaves the head a spirally winding course, without however in
any way obstructing the free passage of the steam, which invariably causes a
certain amount of back pressure in the cylinders.
And in order to make the present invention more easily intelligible reference is
lad to the accompanying drawing in which similar letters denote similar parts
throughout the several views:—
Fig. 1 is a vertical section through the apparatus,
Fig. 2 a plan of the same.
The body a is advantageously cylindrical in form but may be of any other form
provided it offers no obstruction to the steam egress and it is attached to the mouth
of the exhaust pipe by means of a flange, screw threaded connections or in other
suitable manner. The said body or casing provided with interior ribs or webs b
arranged spirally along its interior walls, said ribs or webs being arranged either
to leave a circular opening through the centre of the head, or they may also extend
inwards to the axis of the same. The pitch or incline of the said spirally winding
ribs or webs may be varied at will according to circumstances. Means may also
be employed in connection with this exhaust head to vary its position vertically on
the mouth of the exhaust pipe. In the drawing this is shown as accomplished by
mounting the ribs or webs bon an inner cylinder al vertically adjustable in the
outer cylinder a by means of the screws d d adapted to move in slots cc of the
outer cylinder and when tightened up to retain the inner cylinder with the spirally
wound ribs in any desired vertical position with regard to the exhaust pipe
mouth,
Experiments with the present invention have shown that the fire burns more
evenly than with the ordinary conical exhaust heads and that less fuel is required,
furthermore, it has been observed that a head of this construction entirely
extinguishes all sparks.
It is obvious that the present invention is not restricted to the particular
construction herein described which may be varied in many ways without departing
from the nature of the invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. An exhaust head having internal spirally wound ribs or webs in the manner
substantially as described.
2. An exhaust bead having internal spirally wound vertically adjustable ribs
or webs substantially as described.

page_text: 3. In an exhaust head the combination of a cylinder having internal spirally
wound ribs or webs and means for attaching said cylinder to the mouth of the
exhaust pipe substantially as described.
4. In an exhaust head the combination of a cylinder a, an interior cylinder a¹
having internal spirally wound ribs or webs b, guide slots c in the exterior cylinder
and means for adjusting the said interior cylinder vertically in said guide. slots and
means for attaching the said head to the mouth of the exhaust pipe in the manner
and for the purpose substantially as described and shown.
Dated this 16th day of March 1895.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.