OF COUL HEADS FOR VENTILATORS
Year: 1886

page_text: I, JOHN WEATHERHEAD of 60 Bell Street Millfield Sunderland in the County of
Durham Angle iron smith do hereby declare the nature of my invention for, THE
MAKING OF COUL HEADS FOR VENTILATORS, and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
My invention is to improve the constructing in coul heads for ventilators. It
consists of blocks made of inetal, steel springs, and guides, The object of my invention
is to make the conl head in two pieces, this is attained in the following manner, It will
necessarily take one block to fit on top of another block for each part of coul head, and
pressure being put upon the top block puts the iron into shape.
These blocks are marked on the accompanying drawings as A & B top block and
bottom block to each, The bottom block of A is to the shape of the bottom part of coul
head, on the bottom of this block a flange is cast to fasten on to a fixed bed plate, On
top of this block there is a recess for spring (1) so as it will go flush when it is in
place, this spring takes the iron into shape and prevents the iron from buckling, it
also prevents the iron from closeing too soon this spring has a slot hole at each side so
as to allow it to work up and down, and it is connected to the block with two counter-
sunk head bolts one in each slot, at the top of this spring there is another bolt attached,
it is to guide this spring into its place this bolt works through a hole in the top of this
block and acts against spring (2) this spring (2) has also at each end a slot hole so as
to allow it to work up and down, and it is connected to the bottom of the fixed bed
plate by the slot holes with two bolts one in each slot, this spring is required to act
against spring (1) so as to allow spring (1) to come gradualy down with the pressure,
A steel Cap (3) is fitted in a recess on to the bottom of this block with countersunk
head bolts making it flush this cap is required for the iron to slide down into the shape
of mould at a gradual strain on the iron, there is also an iron guide connected to the
top of this block with stud bolts to keep spring (1) in position.
The top block of A is to the same shape on the inside of the bottom block, on each
side of this block is two iron guides connected to block with bolts, these guides work
in holes in the flange of the bottom block so as to keep the top block in position, on
the top of this block there is a socket for ram (8) and it is connected to the block with
a stud bolt, this Ram is to get the extra pressure necessary.

page_text: The bottom block of B the inside of this block being of the same shape as the top of
the coul head, On the bottom of this block there is a bed made to fit into a groved
fixed bed plate, and made so that it will slide to the will of the workman, a stay with a
wheel is attached to the front of this block with stud bolts, it is to take the pressure
from the bed plate, On the top sides of this block is two loose metal sides (4) and
each side is connected to the block with two steel springs and stud bolts, these sides is
also to prevent the iron from buckling.
The top block of B it being to the same shape on the outside as the inside of the
bottom block and it is connected to the bottom block, with an iron hinge and worked
with an iron handle, at the top of this block there is a recess for spring (5) so that it
will go flush when it is pressed down into its place, this spring is to prevent the iron
from buckling, this spring has a slot hole at each side so as it will work up and down,
it is connected to this block with two countersunk head bolts one in each slot, at the
top of this spring there is another bolt attached it is to guide this spring into its place,
this bolt works through a hole in the top of this block, and acts against spring (6) at
the bottom end of this block there is another recess for spring (7) to let it go flush
when it is in place, this spring is also necessary to prevent the iron from buckling, this
spring has also a slot hole at each side so as it will work up and down, and it is also
connected to the block by the slot holes with two countersunk head bolts one in each
slot, in the center of this spring there is another bolt attached, it is also to guide this
spring (7) into its place this bolt works through a hole at the bottom of this block, and
also acts against spring (6) spring (6) is fitted on the inside of this block, and is
required to act against spring (5) & (7) so as to allow springs (5) & (7) to come up
gradualy with the pressure.
The operations are as follows The iron is heated and put between the blocks and
steam or hydraulic pressure being put upon the top block with the Ram (8) and the
steel springs (1) (2) & (2) catching the iron in time to prevent it from buckling, while
the steel springs (2) & (6) acts against the afore mentioned springs (1) (5) & (7) so as
to let them force the iron into shape the springs sides (4) also acting against the iron
keeping buckles out while the steel cap (3) allowes the iron to slide down according to
the presser put upon it.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is
1st. The plates are shaped by the means described without the aid of mallets or
hammers.
2nd. Riveting is considerably less as they are made in two pieces instead of from
four to seven.