Improvements in Apparatus for Working Punkahs.
Year: 1888

page_text: Date of Application, 11th Dec., 1888
Complete Specification Left, 6th Sept., 1889-Accepted. 7th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Working Punkahs.
I, THOMAS TOUSSAINT WATSON Assistant Locomotive Superintendent, G.I.P.
Railway, of Jubalpur, in the Empire of ludia do hereby declare the nature of this
invention to be as follows:-
My invention relates to apparatus in which elastic fluid such as steam or com-
pressed or rarefied air or water under pressure is applied to work punkahs at a rate
determined by the swing of the punkahs themselves. On a framing I mount some
height from the ground a horizontal cylinder fitted with a piston and provided
with a slide valve and ports for admission and emission of the working Huid. I
connect the piston rod crosshead by side links to a lever which is pivotted at the
lower part of the frame and extends upwards having attached to its top the rope or
cord leading to a punkah or to several punkahs. The piston rod crosshead has a
sleeve which loosely embraces the rod of the slide valve on which rod are adjust-
able tappets. The working fluid acts in the front part of the cylinder, the bottom
of which may be open when steam, compressed air or water under pressure is
employed when the apparatus is worked by vacuum, the bottom is closed and
connecteil to a vacuum chamber, air at atmospheric pressure then acting as the
working fluid in the front end of the cylinder. The fluid, in propelling the piston
back, thereby pulls the lever and the punkah or punkahs attached to: it, and the
crosshead. on meeting the hinder tappet shifts the slide valve so as to cut off supply
of fluid and open discharge. The punkahs and lever then swing back, assisted if
necessary by weights-on the lever, drawing the piston until its crosshead meets the
front tappet and shifts the slide valve so that the discharge is closed and fluid is
again admitted to act on the piston. As the forward stroke of the piston is effectedl
by the swing of the punkahs and lever in one direction, the strokes of the piston
are timed by this swing. When water under pressure is employed as the working
fluid, the cylinder has connected to it an air vessel the pressure in which causes the
piston to complete its stroke during the shift of the slide valve.
Dated this 11th dow of Donaushar 1888.
ABEL & IMRAY,.
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Working Punkahs.
I, THOMAS TOUSSAINT WATSON Assistant Locomotive Superintendent G.I.P.
Railway of Jubalpur in the Empire of India, 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 :-
My invention relates to apparatus in which elastic fluid such as steam or com-
pressed or rarefied air or water under pressure is applied to work punkahs at a rate
determined by the swing of the punkahs themselves. On a framing I mount some
height from the ground a horizontal cylinder fitted with a piston and provided with
a slide valve and ports for admission and emission of the working fluid. I connect
the piston rod crosshead by side links to a lever which is pivotted at the lower part
of the frame and extends upwards having attached to its top the rope or cord leading
to a punkah or to several punkahs. The piston rod crosshead acts on adjustable
tappets on the rod of the slide valve so as to shift the valve at each end of the
stroke. The working fluid acts in the one end of the cylinder, the bottom of
which may be open when steam, compressed air or water under pressure is employed;
Price dl

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when the apparatus is working by vacuum the bottom is closed and connected to a
vacuum chamber, air at atmospheric pressure then acting as the working fluid on
the front end of the cylinder. The fluid in propelling the piston back thereby pulls
the lever and the punkah or punkahs attached to it, and the crosshead on meeting
the hinder tappet shifts. the slide valve so as to cut off supply of fluid and open
discharge The punkahs and lever then swing back, assisted if necessary by
weights on the lever drawing the piston until its crosshead meets the front tappet
and shifts the slide valve so that the discharge is closed and fluid is again adinitted
to act on the piston. As the forward stroke of the piston is effected by the swing
of the punkahs and lever in one direction, the strokes of the piston are timed by
this swing. When water under pressure is employed as the working fluid, the
cylinder has connected to it an air vessel the pressure in which causes the piston to
complete its stroke during the shift of the slide valve.
Fig. 1 of the accompanying drawings is a perspective view of the apparatus, &
Figure 2 is a sectional plan of the cylinder and slide valve drawn to an enlarged
scale. The cylinder A is fixed on a frame B to the lower part of which is pivotted
the lever C, this lever having a slotted hole at D to receive a pin projecting laterally
from the piston rod E, and having at its upper end a cord F which extends to a
punkah or set of punkahs. The pin D of the piston rod works in a slot of the slide
rod G in which slot are fixed adjustable tappets 19. Referring to Fig. 2, H is the
slide valve which works in a jacket supplied with the working fluid by the pipe I,
and governs a part h to the cylinder and a port k to the discharge pipe K.
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
Apparatus for working punkahs consisting of a vertical lever connected to a
punkah or set of punkahs and to the rod of a piston moved by fluid pressure in a
cylinder, the ingress and egress of the working fluid being governed by a slide valve
moved by adjustable tappets acted on by the piston rod, substantially as described.
Dated this 5th day of September 1889.
ABEL & IMRAY,
Agents for the Applicant.