AN IMPROVED COMBINED SYPHONIC VENTILATING CHIMNEY TOP AND WIND GUARD
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Carl Herman von Ullner at the Office
of the Commissioners of Patents on the 15th May 1882.
CARL HERMAN VON ULLNER of Arlington [Road] Street Middlesex "AN IMPROVED
COMBINED SYPHONIC VENTILATING CHIMNEY TOP AND WIND GUARD
"
This Invention relates to a further and improved development of my invention
of Improvements in ventilators for which Letters Patent were granted to me on
the 28th June 1879 numbered 2622 and in which invention I have since discovered
by practical experience the following defective features vizt an absence of proper
provision for the expansion of the air-a defective wind guard against rebounding
wind and an insufficiency of area which defects it is the object of my present
invention to remedy
For this purpose I make a hollow metal basin so shaped internally as to assume
a tapering tubular form being of smaller diameter at the top than at the bottom
while branching outwards laterally therefrom are a series of angular expanding
chambers each chamber having a triangular opening in the top.
I then make a hollow covering plate which at the top is of a tubular form while
laterally it radiates into a series of alternate arms and cowls the arms corresponding
in number with the triangular openings before mentioned while the cowls
correspond numerically with the fluted recesses existing externally between the
angular chambers already described
I then join the base and the covering plate together so adjusting them that the
arms covers the triangular openings in the base and so form air chambers wherein
the air or smoke expands as it ascends
At the same time the cowls project over the fluted recesses between such air
chambers and act as conductors to conduct the wind or external atmosphere on
to the upper periphery of the tube formed in the base whereby a powerful suction
is created in the apparatus
I then place an annular conical guard plate hollow at the top and mounted upon
suitable standards, above such covering plate and so adjust this guard plate that
its lower edge overhangs the top of the covering plate
The annular orifice in the guard plate is partially screened by a metal disc
loosely attached to the standards which pass through and project some distance

page_text: above such guard plate so as to allow of the disc rising and falling with the action
of the wind or air while mounted on the extremities of such standards is a conical
cap hollow in the centre and somewhat smaller in circumference than the guard
plate
When fitted together such guard plate, disc and cap form a pyramidal wind
guard which effectually obviates down-blows from rebounding winds at the same
time that the vertical air currents are utilised to create a strong suction in the
apparatus
This apparatus when completed I place upon a tubular base consisting of two
pipes bent to a suitable angle about midway and uniting together at the top so as
to form a single tube Such tubular base serves both to increase the draught and
prolong the suction created by the apparatus; in the absence, or between the
intervals of external atmospheric pressure
The advantages resulting from my improved apparatus are powerful syphonic
action without the aid of wind-increased exhausting power with the action of the
wind-utilisation of vertical-and protection from rebounding winds-freedom
from choking and facility for cleaning the chimney; there being no obstruction
offered to the sweeps' brush
I would here observe that the principal parts of my improved apparatus may be
used separately as well as in their combined form