IMPROVEMENTS IN SAND BLAST APPARATUS
Year: 1885

page_text: CORTELIE
DIECIFICATION.
We BENJAMIN JOHN ROUND of N° 9 Northampton Street Manufacturer and
WALTER WHAM of N° 5 Hubert Street Aston Road Engineer both of Bir-
mingham in the County of Warwick do hereby declare the nature of the
said invention for " IMPROVEMENTS IN SAND BLAST APPARATUS" and in what
manner the samo is to be performed to be particularly described and ascertained in
and by the following statement as follows that is to say:-
Our invention has for its object improvements in sand blast apparatus and
applies more in particular to the apparatus when used for the finer or thinner
classes of jewellery or other such like articles requiring more delicate treatment
than the frosting of glass for which the apparatus has been largely used. In the
jewellery trade some articles are very strong and others very weak sensitive and
delicate so that the same treatment in the one case as the other is altogether
unsuitable and our invention is for the purpose of meeting this need.
In order that our Invention may be clearly understood and more easily carried
into practice we have appended hereunto a sheet of drawings showing one appli-
cation to an apparatus suitable for use in the jewellery trade but which may be
applied to other purposes such for instance as the Electro Plate Trade.
Figure 1. is a general side elevation of the apparatus.
Figure 2. is a general front elevation of the same and
Figure 3. is a plan and for the purpose of showing the mode of operating the
apparatus more clearly.
Figure 4. is shown as a sectional elevation through operating box E on the
line A. B.
Figure 5. is an elevation of the regulator.
Now on reference to these drawings it will be seen that C is the air chamber
and D is the vacuum or exhaust pipe communicating with the exhauster or air
pump and the top of the air chamber C which is again connected to the sand pipe
which communicates by a blast nozzle with the inner part of the operating box E.
The articles to be operated upon are kept upon suitable shelves or grates inside
this box E and the operators hands are put through the holes h and k and his arms
or wrists made tight by the elastic or other sleeve while his hands are gloved to
hold the articles to be operated upon or they may be held in a variety of ways.
Now communicating with the vacuum or exhaust pipe D is a supplemental pipe m

page_text: which is fitted with the automatic safety valve n and the variable regulator R with
its stalk or spindle 8 passing through the side of the operating box E where it
finishes with a suitable regulating handle or other equivalent t which may be
moved at pleasure into any of the holes win the quadrant plate or side Y. We
have shown the face of this regulator at Figure 5 where it will be seen that the
plate is cut away at some parts &z with corresponding openings in the regulator
seat or facing, F is the sand box, and the action is as follows. The operator takes
up an article of a strong or heavy kind or otherwise requiring a strong blast and
he at once moves over his handle or levert so as to shut his valve P thus closing
the openings in the facing and bringing on the full effect of the vacuum-After
finishing this article the operator takes up next (without withdrawing his hands a
very light and fragile article which he can see through the glass door J when he
at once turns over his handle t in the other direction so as to open his valve P thus
distroying in measure the force of the vacuum and blast and thus allowing the
delicate article to be operated upon most tenderly and effectively. Any desired
intermediate strength of blast may be obtained by the handle being placed in the
several divisions or holes in the quadrant plate. It will of course be understood
that we do not confine ourselves to placing the variable regulator R in any par-
ticular position as this may be varied considerably and may be worked either
by the hand or the foot from the outside but we have shown the handle as we have
found it most convenient for this special class of work now being explained. It is
of course possible to vary such apparatus by driving the Engine or motor faster or
slower but this is scarcely ever possible in practice The application of the
apparatus is very wide.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declaro what wo
claim is
The improvements in sand blast apparatus which may be varied in its strength"
of blast at pleasure by a variable regulator R or its equivalent substantially as
herein set forth.
GEORGE BARKER,
Agent for the Applicants,
77, Colmore Row, Birmingham.