Improvements in Apparatus for Forming Cranks on Shafts.
Year: 1891

page_text: Date of Application, 16th Nov., 1891
Complete Specification Left, 26th July, 1892-Accepted, 27th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Forming Cranks on Shafts.
We, JOSEPH LINDSAY, and JOHN NICOLL LINDSAY, of Blackness Foundry,
Dundee, in the County of Forfar, North Britain, Engineers, do hereby declare
the nature of this invention to be as follows, that is to say :—
Our said invention has for its object, by means of improved apparatus, to
form cranks upon shafts in a satisfactory, expeditious and economical manner.
In carrying out our invention a suitable length of shaft, on which a double-
cheeked crank is to be formed, having the required extent of it sufficiently heated,
is placed between lower and upper cress blocks in an hydraulic press having a
rising platen. To the entablature or top of the press there is fixed a cress block
shaped with a downwardly projecting middle part corresponding to the space
between the cheeks of the crank, the formation of which is effected downwards
relatively to the straight parts of the shaft. The upper cress block is also shaped
so as in transverse section to be a counterpart of the upper half of the crank shaft.
Upon the platen of the press there is fixed a block formed with reversé inclined
guides, which, when the platen rises, bear up against inclined surfaces upon the
bottom parts of two lower main blocks which carry cress blocks for shaping
the bottom of the crank and the corners and outer sides of the crank cheeks.
The length of shaft is laid with its end parts resting in channels formed in the outer
end parts of the two main lower blocks, the end parts being held down by cutters,
whilst the extreme ends are in contact with solid parts of the blocks at the outer
ends of the channels. A middle cress block which is made with side cheeks, and
with a bottom recess which is in shape a counterpart of the form to be given to the
bottom of the crank, rests with its ends in horizontal guides in the main lower blocks.
There are in addition two lateral cress blocks carried by the main lower blocks,, and
shaped with recesses which are counterparts of the forms to be given to the outer
sides of the crank cheeks and to the under sides of parts of the shaft extending
each way from the crank.
When the press platen rises after a length of shaft has been placed in position,
the shaft first encounters the upper cress block, and becomes bended down at the
crank part to the lower middle cress block. The continued rising of the press
platen, by the action of the inclined guides causes the lower main blocks to approach
each other and to press the ends of the shaft inwards sufficiently to afford metal
for forming the crank cheeks the shaping of which is completed by the lateral cress
blocks.
The main lower blocks are connected together by strong side rods which insure
the maintenance of their proper relative positions, the rods sliding in guide eyes onl
the blocks to allow of the blocks moving towards and from each other.
When a crank has been formed the press platen is lowered and the main lower
blocks being suspended by chains or otherwise supported become separated as the
platen recedes.
The hydraulic press is by preference worked by means of an accumulator so as
to obtain quick action.
.The cress blocks may be changed. to suit cranks of different sizes.
Dated thin Waith
1001

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Forming Cranks on Shafts.
We, JOSEPH LINDSAY and JOHN NICOLL LINDSAY, of Blackness Foundry
Dundee, in the County of Forfar, North Britain, Engineers, 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, that is to say :-
Our said invention has for its object by means of improved apparatus, to form
cranks upon shafts, in a satisfactory, expeditious, and economical manner.
And in order that our said invention, and the manner of performing the same
may be properly understood, we hereunto append a sheet of explanatory drawings
to be hereinafter referred to, and showing a simple, and convenient modification of
our improved apparatus, for forming cranks on shafts.
Figures 1 and 2, of the drawings are vertical sections as at right angles to each
other, of our apparatus and Figure, 3, is a side elevation of a completed crank.
In carrying out our invention, a suitable length of shaft on which a double-
cheeked crank, such as is represented in Figure, 3, is to be formed, having the
required extent of it sufficiently heated, is placed between a lower cress-block, A,
and an upper cress block, B, in an hydraulic press, having a rising platen, C. To
the entablature, or top E, of the press, there is fixed a cress block, B, shaped with
a downwardly projecting middle part, corresponding to the space between the
cheeks, F, of the crank, the formation of which is effected downwards, relatively to
the straight parts of the shaft. The upper cress block, B, is also shaped, so as in
transverse section, to be a counterpart of the upper half of the crank shaft.
Upon the platen, C, of the press, there is fixed by means of bolts, D, a block, G,
formed with reverse inclined guides, Q, which, when the platen, C, rises, bear up
against inclined surfaces upon the bottom parts of two lower main blocks, H, H,
which carry cress blocks, A, I, I, for shaping the bottom of the crank, and the
corners and outer sides of the crank cheeks, F. The length of shaft, when in
position, is laid with its end parts resting in channels, R, formed in the outer end
parts of the two main lower blocks, H, H, the said end parts being held down by
cotters, K, whilst the extreme ends are in contact with solid parts, S, of the blocks,
at the outer ends of the channels. A middle cress block, A, which is made with
side cheeks and with a bottom recess, which is in shape a counterpart of the form
to be given to the bottom of the crank, rests with its ends in horizontal guides, in
the main lower blocks, H, H. There are in addition two lateral cress blocks, I, I,
carried by the main lower blocks, H, H, and shaped with recesses which are
counterparts of the forms to be given to the outer sides of the crank cheeks, F, and
to the undersides of those parts of the shaft, extending each way from the crank.
The proper position of the lateral cress blocks, I, is insured by screw pins, L, (as
shown in Figure, 1) which are arranged, so that the cress blocks, I, can be easily
removed.
When the press platen, C, rises, after a length of shaft has been placed in position,
with the required extent of it heated to a sufficiently high temperature, the shaft
first encounters the upper cress block, B, and becomes bended down at the crank
part, to the lower middle cress block, A. The continued rising of the press
platen, C, by the action of the inclined guides, Q, causes the lower main
blocks, H, H, to approach each other, and to press the ends of the shaft inwards
sufficiently to afford metal for forming the crank cheeks, F, the shaping of which
is completed by the lateral cress blocks, I.
The main lower blocks, H, H, are connected together by strong side rods, M,
which insure the maintenance of their proper relative positions, the rods, M,
sliding in guide eyes, N, on the blocks, H, H, to allow of the blocks moving
towards, and from each other.

page_text: When a crank has been formed, the press platen, C, is lowered, and the main
lower blocks, H, H, being suspended by chains, P, (or otherwise supported) become
separated as the platen, C, recedes.
The hydraulic press is, by preference, worked by means of an accumulator, so
as to obtain quick action. The cress blocks, A, I, and, B, may be changed to suit
cranks of different sizes.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
In apparatus for forming cranks on shafts the combination of cress blocks
(as A, B) to shape the middle of the crank, lateral cress blocks (as, I, I) to shape
the cheeks, and main blocks (as H, H) to carry the shaft length and apply pressure
to its ends, the parts being constructed, arranged, and operating substantially in
the manner hereinbefore described.
Dated this Twenty-fifth day of July 1892.
EDMUND HUNT,
Applicants' Agent.