Improvements in the Manufacture of Cast Metal Brackets for Shelving and the like.
Year: 1891

page_text: Date of Application, 9th Nov., 1891
Complete Specification Left, 6th Aug., 1892-Accepted, 10th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Cast Metal Brackets for
Shelving and the like.
I, HAROLD HOLCROFT, of Ettingshall Foundry, Wolverhampton in the
County of Stafford, Iron Founder, do hereby declare the nature of this invention
to be as follows :-
Cast metal brackets for supporting shelving and the like, as heretofore
constructed, have the screw holes by which they are to be fixed, and by which the
parts they are intended to carry are to be fixed to them, formed as round holes,
usually countersunk to receive the screw heads, either by moulding in such manner
as to leave a sand core for each hole, or by means of chills or dry sand cores
within the mould, or by first casting the brackets without holes and then drilling
the holes as required. All these methods of forming the holes are, however,
somewhat troublesome and expensive, for reasons well known to manufacturers;
and the object of this invention is to form the holes in the process of moulding and
casting the brackets, in a manner which renders the moulding substantially as
convenient and economical as when the brackets are cast without holes.
According to this invention, the bracket pattern used in forming the mould for
casting has the holes for the screws notched in the edges thereof. The pattern is
moulded in a horizontal plane with the lower half in a bottom moulding box and
the upper half in a top moulding box; and as the top box is removed from the
pattern it brings up out of the notches in the upper edge of the pattern cores of
sand which form notches in the top edge of the casting, and as the pattern is
removed from the bottom box corresponding cores are left in the lower portion of
the mould.
The notched holes may have rounded corners at the edges of the bracket, for the
sake of neatness of appearance and still greater facility in moulding; and such
holes may be splayed or chamfered to receive the screw heads.
Dated this 7th day of November 1891.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Cast Metal Brackets for
Shelving and the like.
I, HAROLD HOLCROFT, of Ettingshall Foundry, Wolverhampton in the County
of Stafford, Iron Founder 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 :-
.
Cast metal brackets for supporting shelving and the like, as heretofore
constructed, have the holes for the screws by which they are to be fixed, and by
which the parts they are intended to carry are to be fixed to them, formed as round
holes, usually countersunk to receive the screw heads, either by moulding in such
manner as to leave a sand core for each hole, or by means of chills or dry sand
cores within the moulds, or by first casting the brackets without holes and then
drilling the holes as required. All these methods of forming the holes have,
however, been found to be somewhat troublesome and expensive, for reasons well
known to manufacturers; and the object of this invention is to form the holes for
the screws in the process of moulding and casting the brackets, in a novel manner
TD 0:1

page_text: which renders the moulding substantially as convenient and economical as when
the brackets are cast without holes. The method of forming the holes for the
screws, according to this invention, causes them to be modified in shape, as will
hereinafter appear.
According to this invention, the bracket pattern used in forming the mould for
casting has the holes for the screws notched in the edges thereof. The pattern is
moulded in a horizontal plane, with the lower half in a bottom moulding box and
the upper half in a top moulding box; and as the top box is removed from the
pattern it brings up out of the notches in the upper edge of the pattern cores of
sand which form notches in the top edge of the casting, and as the pattern is
removed from the bottom box corresponding cores are left in the lower portion of
the mould. The holes for the screws thus formed in the brackets are, of course,
open to the edges of the bracket flanges, instead of being round holes therethrough
as has been heretofore usual.
In order that the invention may be clearly understood, I have appended hereto
a sheet of drawings, of which
Figure 1 shews a side elevation of a bracket with holes c, for the screws, formed
in from the edges of the flanges, according to. or in the manner of, this invention.
Figure 2 is an edge view of the underside of the bracket shewn by Figure 1.
Figure 3 is an end view of the bracket shewn by Figure 1, as the same would be
seen looking in the direction of the arrow a.
Figure 4 is a sectional view through a sand mould for the bracket, the section
being taken in a plane at right angles to the horizontal plane along which the
pattern lies when within the mould, and this section is taken on a line of the mould
corresponding with the line x x of Figure 1.
The brackets may be moulded from a pattern which has its halves projecting,
respectively, from opposite sides of a plate or "card," constituting it what is
technically known as a "card pattern;" or they may be moulded by the aid of an
"odd-side;" or form a pattern divided into two separate parts removably dowelled
together. In any case, however, holes corresponding to the holes e in the bracket
flanges A. A are notched in from the edges of the corresponding flanges of the
pattern, being formed to enlarge somewhat from their inner to their open ends so
as to leave the necessary taper or "draft" for allowing the cores or blocks of sand
which are rammed up within them in moulding to be withdrawn therefrom as the
mould and pattern are parted from one another.
C
The parting d, between the sand B in the bottom moulding box and the sand B¹
in the top moulding box, is along the central horizontal plane of the pattern, as
indicated by Figure 4. As the top box carrying the sand B' is lifted from off the
top half of the pattern, cores or blocks of sand c¹ (of which, owing to the position
in which the section is taken, only one is shewn by Figure 4), which have been
rammed into the holes in the upper half of the pattern which correspond to the
holes c of the corresponding half of the bracket, are brought out with the main
body of the sand B¹; and on the removal of the pattern from the sand B in the
bottom box corresponding cores or blocks of sand 2, which have been rammed up
into the holes in the bottom half of the pattern which correspond to the holes c in
the corresponding half of the bracket, are left in the mould. When, after the
removal of the pattern, the boxes have been again put together to make up the
mould (as shewn by Figure 4) the cores or blocks c c form, when the metal has
been poured into the mould, the holes c in the bracket corresponding to the holes
notched in the edges of the pattern.
The notched holes may have rounded corners at the edges of the bracket, for
the sake of neatness of appearance and still greater facility in moulding. A hole
formed in this manner is shewn by Figure 5, which is a short length, broken off at
each end, of a portion of one of the flanges of the pattern and of the web C. The
holes c may be splayed or chamfered, as shewn, at the sides thereof on which the
heads of the screws which pass through them will be when the screws are fixed, so
as to make the holes countersunk to receive the screw heads.

page_text: As indicated in a previous paragraph, the screw holes in the bracket have
previously been formed by cores formed in the process of ramming up the pattern ;
but in such case the pattern has needed to be moulded skew-wise, and the holes in
the pattern flanges in which the cores have been rammed up have needed to be
formed skew-wise through such flanges in order that the cores might be withdrawn
therefrom, and the holes through the bracket flanges have, consequently, been
formed skew-wise therethrough. Moreover, considerable care has been required
in moulding.
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 :-
The manufacture of cast metal brackets for shelving and the like by the use of a
pattern in which holes, corresponding in shape and position to the intended screw
holes through the bracket flanges, are formed as notches in the edges thereof,
substantially as described for the purpose set forth.
Dated this 5th day of August 1900
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.