Improvements in or relating to Sand Valves.
Year: 1895

page_text: Date of Application, 24th June, 1895
Complete Specification Left, 17th Mar., 1896-Accepted, 25th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Sand Valves.
1, DAVID THOMAS of 5 Oak Street Aberdare in the County of Glamorgan,
South Wales do hereby declare the nature of this invention to be as follows :—
This invention relates to valves for the supply or passage of sand, more especially
for locomotive engines, and it is intended to prevent the choking of said valves by
which the supply of sand is liable to fail, or to permit of the valve and its port
being easily and quickly freed from any accumulation of damp sand or other
obstruction.
Such a valve consists of a plate through which is made a curved or straight
slot or port for passage of the sand. Over this port is fitted a cover plate which
may be partially revolved or caused to slide in the one or other direction to
either cover said slot entirely or leave it uncovered at the one or other end
thereof.
When said cover plate revolves the curved slot is made in the form of au are
concentric with the axis of the cover plate, when the cover plate slides to and fro
in a straight line, the slot is parallel with the guides of the cover plate or with its
direction of movement.
On the cover plate fitted a knife or projection which, when the cover plate is
moved, moves in the slot and clears it of obstruction. Over the back of the
cover plate extends a fixed arm operating as a scraper to prevent sand adhering to
the cover plate.
Dated this 24th day of June 1895.
HERBERT HADDAN & Co.,
Agents to Applicant.
I, DAVID THOMAS, of 5 Oak Street, Aberdare, in the County of Glamorgan,
South Wales, 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:-
This invention relates to valves for the supply or passage of sand, more especially
for locomotive engines, and it is intended to prevent the choking of said valves by
which the supply of sand is liable to fail, or to permit of the valve and its port
being easily and quickly freed from any accumulation of damp sand or other
obstruction.
Such a valve consists of a plate through which is made a curved or straight
slot or port for passage of the sand, over this port is fitted a cover plate which
may be partially revolved or caused to slide in the one or other direction to
either cover said slot entirely or leave it uncovered at the one or other end
thereof.
When said cover plate is intended to revolve the curved slot is made in the form
D

page_text: of an arc concentric with the axis of the cover plate, when the cover plate slides
to and fro in a straight line the slot is parallel with the guides of the cover plate
or with its direction of movement.
On the cover plate is fitted a cutter which, when the cover plate is moved,
'moves in the slot and clears it of obstruction. Over the back of the cover plate
extends a fixed arm operating as a scraper to prevent sand adhering to the cover
plate.
In order that this invention may be more fully understood one form of the
said valve is shown in the annexed sheet of drawings in which Fig. 1 is a
plan view, Fig. 2 a section on line 2-2 Fig. 1 and Fig. 3 a plan view from
below.
The form of valve here shown is of the rotary or oscillatory type.
a is a base
plate, having a passage way in the form of a curved slot, the centre of curvature
lying at c which is also the pivotal axis of the plate d which covers or uncovers
the slot b. The plate d is preferably of the shape shown, that is to say, half of
it is of greater radius than the outer edge of slot band the other half 2 is of
less radius than the inner edge of the slot b. Under the middle of the larger
part is fitted a projection e which I have termed the cutter.
This cutter lies in the slot, and by rocking the plate d it may be made to move
from end to end of the slot b in order to dislodge all obstruction. The plate d may
be mounted on and rocked by means of the rod f fitted in a bearing in the base
plate a and squared where it passes through the plate din order to engage
therewith. The lateral swing of plate & may be limited by the knife e in the slot b
or by a special block such as g.
The plate d is held down in place by the finger which extends over it. This
finger is attached to plate a by a screw or screws ; or by studs or otherwise
and it extends over the back of plate d and also serves as a scraper to dislodge
accretions of damp sand or the like that might adhere to the back of the
.plate d.
I do not confine myself to the shape of valve here shown nor to the specific
arrangement of the parts as illustrated but
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A sand valve comprising a plate having an elongated slot and a cover plate
adapted to be reciprocated or moved over said slot the said cover plate having a
projection lying in said slot for the purpose set forth.
2. A sand valve comprising a plate having an elongated slot, a cover plate
adapted to be reciprocated or moved over said slot, a projection on said cover plate
extending into said slot and a finger extending over the back of the cover plate and
forming a scraper, the whole for the purpose set forth.
3. A sand valve comprising a plate a having a curved slot band a cover plate
such as d pivoted at c and having a projection e with or without the scraper h
-substantially as and for the purpose set forth.
Dated this 12th day of March 1906
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, W.C., Agents to Applicant.