Improvements in Paving Bricks, and in Dies to be Used in the Manufacture of the same.
Year: 1895

page_text: Date of Application, 10th Dec., 1890
Complete Specification Loft fot Area 1406 40canted 12th Sant 1806
Date of Application, roth Dec., 1893
Complete Specification Loft 1ot Ang
14.06 Accepted, 12th Sept, 1906
PROVISIONAL SPECIFICATION.
Improvements in Paving Bricks, and in Dies to be Used in the
Manufacture of the same.
I, JOSEPH HAMBLET of Piercy Blue Brick, Tile and Pipe Works, West
Bromwich, in the County of Stafford, Brick Tile and Pipe Manufacturer, do
hereby declare the nature of this invention to be as follows:-
My invention has for its object to prevent the scaling or paring off of the
surface of the treading faces of paving bricks during the wear of the same; and
this object I effect by treating the paving bricks during their manufacture in the
manner and by the use of the dies hereinafter described.
I remark that the scaling referred to of the surfaces of the treading faces of
paving bricks is due principally to the formation near the said faces of "blisters"
or "blow holes" during the manufacture of the said bricks.
"
By treating the paving bricks according to my invention the formation of
" blisters or "blow holes" near the treading face of the brick is prevented and
hence the scaling of the treading surface during the wear of the brick is reduced
to a minimum.
In carrying my invention into effect I mould the paving brick in the ordinary
way but during the compressing of the moulded brick I form in that face of the
brick which is to form the treading face a series of fine holes or vents for the
escape of air during the compressing and burning operations. I form the said fine
holes or vents by placing in the upper die of the pair of compressing dies rows of
fine pins which on the descent of the said upper die penetrate the face of the brick
under compression and permit the immediate escape of air and thereby prevent in
the finished brick the formation of blisters or blow holes as before described.
I do not limit myself to the depth and number or distance apart of the fine
holes or air vents made in the manner described in the treading face of the brick
but I have found that holes of a depth say of one half an inch and three quarters
of an inch apart answer well in practice.
My invention is especially applicable to blue paving bricks but may also be
applied to other kinds of paving bricks.
Dated this Tenth day of December 1895
W. T. WHITEMAN,
Agent for the Applicant.
Improvements in Paving Bricks, and in Dies to be Used in the
Manufacture of the same.
I JOSEPH HAMBLET, of Piercy Blue Brick, Tile and Pipe Works, West
Bromwich, in the County of Stafford, Brick, Tile and Pipe Manufacturer, do
hereby declare the nature of my invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
My invention has for its object to prevent the scaling or paring off of the surface
of the treading faces of paving bricks during the wear of the same; and this object

page_text: I effect by treating the paving bricks during their manufacture in the manner and
by the use of the dies hereinafter described.
I remark that the scaling referred ty of the surfaces of the treading faces of
paving bricks is due principally to the formation near the said faces of "blisters"
or "blow holes" during the manufacture of the said bricks.
"
By treating the paving bricks according to my invention the formation of
" blisters or "blow holes" near the treading face of the brick is prevented and
hence the scaling of the treading surface during the wear of the brick is reduce.
to a minimum.
In carrying my invention into effect I mould the paving brick in the ordinary
way but during the compressing of the moulded brick I form in that face of the
brick which is to form the treading face, a series of fine holes or vents for the
escape of air during the compressing and burning operations. I form the said
fine holes or vents by placing in the upper die of the pair of compressing dies,
rows of fine pins which on the descent of the said upper die penetrate the face
of the brick under compression and permit the immediate escape of air and
thereby prevent in the finished brick the formation of blisters or blow holes as
before described.
Figure 1 of the accompanying drawings represents in isometric perspective a
paving brick containing my improvements and Figure 2 is a cross section of the
same.
Figures 3 and 4 represent the press in which the improved bricks are compressed
prior to burning, Figure 3 representing the dies in their raised position and
Figure 4 representing the dies in their lowered or acting position.
Figure 5 represents, partly in side elevation and partly in section, the upper die
of the press and Figure 6 is an isometric perspective view of the underside of the
pin plate attached to the lower face of the upper die. Figure 7 is a cross section
through the said pin plate: Figures 5, 6 and 7 are drawn to a larger scale than
Figures 3 and 4.
The same letters of reference indicate the same parts in the several figures of
the drawings.
out.
In finishing or finally compressing paving bricks according to my invention
I form a series of fine air escape holes a, a, a in the upper or treading face of the
brick as is illustrated in Figures 1 and 2 so as to prevent the formation of
" blisters" or "blow holes" near the said treading face as hereinbefore pointed
The said air escape holes or vents a, a, a are formed by attaching to the
underface of the upper die 6 of the press, which is of the ordinary construction,
by means of screw pins c, c, c, a pin plate d (shown separately in Figures 6 and 7)
the series of pins e, e, e on which pierce the upper or treading face of the brick
in the compressing operation (as represented in Figure 4) and leave the said face,
when the upper die b is raised, with the series of fine holes represented in Figures 1
and 2.
I do not limit myself to the depth and number or distance apart of the fine
holes or air vents made in the manner described in the treading face of the brick
but I have found that holes of a depth say of three quarters of an inch and three
quarters of an inch apart'answer well in practice.
My invention is especially applicable to blue paving bricks but may also be
applied to other kinds of paving bricks.
Having now particularly described and ascertained the nature of my invention
and in what manner the same is to be performed I declare that I claim as my
invention of "Improvements in paving bricks and in dies to be used in the
manufacture of the same":―
First. Forming in the treading faces of paving bricks a series of fiue holes or
vents substantially as and for the purpose herein before described and represented
in Figures 1 and 2 of the accompanying drawings.

page_text: Secondly. The use on the underface of the upper die of a paving brick com-
pressing machine of a plate carrying rows of fine downwardly projecting pins
which on the descent of the die penetrate the face of the brick under compression
substantially as and for the purpose hereinbefore described and illustrated in
Figures 3, 4, 5, 6 and 7 of the accompanying drawings.
Dated the Twenty-fifth day of July 1896.
JOSEPH HAMBLET..