IMPROVEMENTS IN SAND BLAST APPARATUS FOR THE ORNAMENTATION OF GLASS
Year: 1884

page_text: 100IDIVINAL
DREVIFICATION.
I HENRY SARSONS of Chester Street Birmingham in the County of Warwick
Gentleman do hereby declare the nature of my Invention for "IMPROVEMENTS IN
SAND BLAST APPARATUS FOR THE ORNAMENTATION OF GLASS" to be as follows,
that is to say :-
•
My Invention has for its object improvements in sand blast apparatus for the
ornamentation of glass by which means I am enabled to produce a greater effect
with a given power without the liability of the apparatus so constantly getting out
of order which is most inconvenient and the cost of repairs is also greatly reduced
besides many other advantages which naturally follow.
Hitherto in sand blowing apparatus in glass works that class of exhauster have
generally been used which have a horizontal blade at the upper portion which
reciprocates upon a centre shaft. In this apparatus when the sand has been used in
the frosting case where the glass article is being frosted by the action of fine sand
striking upon its surface the heavier portions of the sand gravitate into a suitable
chamber underneath or near to the frosting base but the finer particles of the sand
do not so gravitate but are carried by the suction of the exhauster back into and
through it and thus when great care is used in the construction a considerable
quantity of very fine sand constantly finds its way through such exhausters thus
preventing them working as efficiently as they otherwise would.
Invention in a great measure prevents this.
Now my
In making an apparatus according to my Invention I take an exhausting
cylinder which I place horizontally, and fit with a solid piston having say three
grooves cut around its outer edge but being say one sixteenth smaller in diameter
than the cylinder so that there will be no friction or wear by direct contact with
each other. At the lower portion and at each end of the cylinder I take out
passages or pipes which are sufficiently low to allow a chamber or recess to be
formed at each end of the cylinder in which the very fine sand may accumulate
and be removed from time to time by a suitable lid or lids. These passages or
pipes are then carried upwards and are connected at the top of two vertical
chambers or vessels each of which should be in capacity considerably greater (say

page_text: 2
one and a half times) than the exhaust cylinder aforesaid. The bottom of each of
these chambers or vessels is connected with the pipe leading from the frosting case
aforesaid and each is perforated with holes and has two india rubber or other
valves fitted thereto the one opening inward and the other outward. Now when
the exhauster is at work the fine sand will travel along the lower passage and some
will pass through the valves into the vertical chambers or vessels but a considerable
quantity gravitates in these vessels and passes through the valves which open
outward and is thus removed from the apparatus entirely. So that a large
quantity of sand if not nearly all is thus prevented from reaching the exhausters.
Dated 18th February 1884

page_text: the outlet valves S and S¹ and out through the passage K. The holes w may be
bell mouthed on the inner side to assist the sand to fall through. Thus the
exhauster is kept practically free from sand by my apparatus which prevents the
passage of fine sand to the exhauster and saves wear and tear and excessive
friction and is thus very economical. Where rotary blowers are driven by bands
the saving by my apparatus is very great indeed.
Having now particularly described and ascertained the nature of my Invention
and in what manner the same is to be performed I declare that what I claim is,—
In combination with sand blast apparatus an air vessel or vessels between "the
exhauster and the frosting machines for the purpose herein set forth.