An Improved Sluice Gate.
Year: 1892

page_text: Date of Application, 23rd Feb., 1892
Complete Specification Left, 15th Oct., 1892-Accepted, 14th Jan., 1893
PROVIDIUNAL DI ECIFICATION.
An Improved Sluice Gate.
I, JOHN PITT BAYLY, of 18 Fulham Place, Paddington, W., in the County of
London, Patent Agent, do hereby declare the nature of this invention (a communi-
cation to me from abroad by Edward Reinold, Public Works Department, Poona,
Bombay, India, Civil Engineer,) to be as follows :--
The invention herein described consists of a sluice gate which moves on wheels
or rollers; combined with a special form of face joint whereby practically perfect
watertightness is obtained, and at the same time all sliding friction in the working
of the gate is obviated.
The gate may be constructed of any suitable material-preferably of cast or
wrought iron-and of any form to suit special conditions. It may be worked either
horizontally or vertically or at any desired inclination with the vertical.
The water pressure at the back of the gate is resisted by two or more pairs of
wheels or rollers whereby, in actuating (or opening and closing) the gate all surface
sliding friction is avoided and the only resistance to be overcome is due either to
axle or rolling friction.
Watertightness, at the moment of closure is obtained in the following manner :-
The face of the gate is provided with a narrow rim, the plane of which is at a
certain inclination to the plane of motion of the gate.
The face of the sluice frame is provided with an exactly corresponding rim. At
the moment of closure of the gate, these two rims are in contact, thus forming the
watertight joint. At the moment of opening, these two surfaces or rims are separated
and thus surface friction is entirely obviated. The frame of the gate is further
provided with stops or adjustable set screws by means of which the contact of the
gate with its frame may be regulated with the minutest accuracy. In other words
the gate, when closed, may at will be either in actual and close contact with the
frame or it may be separated from it by an infinitesimally small distance.
A further point in the invention is the arrangement of the aforesaid rim on the
sluice frame.
In order to obtain facility and accuracy of adjustment of the two faces, this rim
is made to cousist of loose adjustable strips, which, when the gate is in its position
of closure, have merely to be brought into contact with the face of the gate, and
fixed in that position, in order to secure the perfectly close water joint.
By a suitable arrangement of counterweights, the sluice gate herein described
may be made perfectly automatic for use on the waste weirs of reservoirs or canals.
In such cases the counterweights are either placed in separate chambers and
actuated by the admission of water into the chambers whereby the effective weight
of the counterweights is reduced in proportion to the amount of water displaced by
them, or the counterweights may be in the form of open vessels, into which water
is admitted and the effective weight of which is increased in proportion to the
amount of water admitted into them. The former method would be generally
preferable where it is desired that the gate should open whilst descending and the
latter in cases where it is desirable that the gate should open whilst ascending.
Dated thin 02-1 dow of Wah 1800

page_text: COMPLETE SPECIFICATION.
An Improved Sluice Gate.
I, JOHN PITT BAYLY, of 18 Fulham Place, Paddington W., in the County of
London, Patent Agent, do hereby declare the nature of this invention (a com-
munication to me from abroad by Edward Reinold, Public Works Department,
Poona, Bombay, India, Civil Engineer) and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:—
The invention herein described consists of a sluice gate which moves on wheels or
rollers; combined with a special form of face joint whereby practically perfect
watertightness is obtained, and at the same time all sliding friction in the working
of the gate is obviated.
The gate may be constructed of any suitable material-preferably of cast or
wrought iron and of any form to suit special conditions. It may be worked either
horizontally or vertically or at any desired inclination with the vertical.
The accompanying drawing illustrates the general principle of the design.
Fig. 1 is a vertical section on line A B.
Fig. 2 is a plan of the sluice gate, sluice, chamber, inlet and outlet.
Fig. 3 is a plan of the top.
Like letters refer to like parts in each of the views.
The gate a with the line of joint a' is suspended by means of chains b, which,
going over pulleys cc, are attached to a counter-weight d, placed in a water-tight
chamber e, to which water is admitted by the inlet fat level of full supply in the
reservoir, and provided at the bottoni with an outlet pipe e', which always discharges
less than the maximum discharge from the inlet pipe. When the discharge from
the inlet stops, i.e., when the level of the water in the reservoir falls below the
sill of the inlet, the outlet pipe, which always remains open, empties the counter-
weight chamber. The action is then as follows:-
When the water in the reservoir rises to the level of the inlet pipe f, the counter-
weight chamber e gradually fills and immerses the counter-weight d. When the
counterweight d has in this manner lost sufficient weight, to release the proportion
of the weight of the gate, required to overcome all friction, the gate begins to move
downwards, and continues to do so, as long as the water in the chamber e rises.
When the discharge (indicated by an arrow in Fig. 2) through the opened sluice g
lowers the water in the reservoir below inlet level, the water is discharged from the
chamber through the outlet pipe el, and the counter-weight regains the weight
necessary to bring up the gate and close the sluice.
The water pressure at the back of the gate is resisted by two or more pairs of
wheels or rollers / whereby, in actuating (or opening and closing) the gate all
surface sliding friction is avoided and the only resistance to be overcome is due
either to axle or rolling friction.
Watertightness at the moment of closure is obtained in the following manner :-
The face of the gate is provided with a narrow rim or line of joint a', the plane
of which is at a certain inclination to the plane of motion of the gate.
The face of the sluice frame j is provided with an exactly corresponding rim.
At the moment of closure of the gate, these two rims are in contact thus forming
the watertight joint. At the moment of opening, these two surfaces or rims are
separated and thus surface friction is entirely obviated. The frame of the gate is
further provided with stops or adjustable set screw i or screws by means of which the
contact of the gate with its frame may be regulated with the minutest accuracy. In
other words the gate, when closed, may at will be either in actual and close contact
with the frame or it may be separated from it by an infinite small distance.
A further point in the invention is the arrangement of the aforesaid rim on the
sluice frame,

page_text: In order to obtain facility and accuracy of adjustment of the two faces, this
rim is made to consist of loose adjustable strips, which when the gate is in its
position of closure, have merely to be brought into contact with the face of the gate,
and fixed in that position, in order to secure the perfectly close water joint.
By a suitable arrangement of counterweights, the sluice gate herein described
may be made perfectly automatic for use on the waste weirs of reservoirs or
canals. In such cases the counterweights are either placed in separate chambers and
actuated by the admission of water into the chambers whereby the effective weight
of the counterweights is reduced in proportion to the amount of water displaced by
them, or the counterweights may be in the form of open vessels, into which water is
admitted and the effective weight of which is increased in proportion to the
amount of water admitted into them. The former method would be generally
preferable where it is desired that the gate should open whilst descending and the
latter in cases where it is desirable that the gate should open whilst ascending.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim, is:-
1. For a sluice gate which, when being opened or closed runs on wheels or rollers
instead of sliding on metallic faces as is the case with the ordinary sluice gates,
combined with a practically watertight joint at the moment of closure, obtained in
the manner substantially as herein before described.
2. For a combination of the above described form of sluice gate and watertight
joint with a suitable arrangement of counter-weights whereby the gate may be made
to work perfectly automatically, substantially as herein described and according to
the accompanying drawing.
1000
J. P. BAYLY,
18, Fulham Place, W., Applicant.