Improvements in Machines for Forming Cranks.
Year: 1891

page_text: Date of Application, 1st Oct., 1891-Accepted, 14th Nov., 1891
COMPLETE SPECIFICATION,
Improvements in Machines for Forming Cranks.
County of Bristol
1, JAMES MADISON DABBITT Zuu, of Fall River,
nd State of Massachusetts, United States of America, Blacksmith, do hereby
eclare the nature of this invention and in what manner the same is to be
erformed, to be particularly described and ascertained, in and by the following
tatement:-
This invention has reference to an improved machine for bending rods to form
ranks, and its object is to produce a simple machine especially adapted for forming
oom cranks in a more perfect manner than has heretofore been accomplished.
To this end, the invention consists in the peculiar construction of the anvil, and
he employment of means whereby the metal is upset at the angles of the crank,
hereby retaining its full size at these points when the crank is formed.
In the accompanying drawing,
L machine homincs rod inserted and partially
JAMES MADISON DABBITT
and State of Massachusetts, United States of America, Blacksmith, 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:-
This invention has reference to an improved machine for bending rods to form
cranks, and its object is to produce a simple machine especially adapted for forming
loom cranks in a more perfect manner than has heretofore been accomplished.
To this end, the invention consists in the peculiar construction of the anvil, and
the employment of means whereby the metal is upset at the angles of the crank,
hereby retaining its full size at these points when the crank is formed.
In the accompanying drawing,
Fig. 1. represents a front
bent.
machine, having a rod inserted and partially
Fig. 2. represents a view of a finished crank.
Fig. 3. represents a side view of the machine, with the levers removed.
Fig. 4. represents an enlarged front view of the anvil.
Fig. 5. represents an enlarged end view of the same.
Fig. 6. represents a view in perspective of the die blocks, and
Figs. 7—8 and 9 represent a different construction of the die-blocks, which form
the sides of the crank.
Similar letters refer to like parts, in all the views.
a, represents the frame of the machine, which has a central vertical perforation
in which the plunger c, moves. Through the head of the frame b, a slot is cut, to
correspond with a similar slot in the upper end of the plunger c. e, e, represent
levers having short arms, which are pivoted in the sides of the machine by
pivots h. To the short arms, are pivoted the die-blocks i, and . These die-blocks
are hinged together by the pivots k, and are provided with the longitudinal grooves
as shown in the enlarged view, Fig. 6.
The anvil 1, is provided with a rounded shoulders, fitting in a corresponding
depression in the base of the machine, where it is held against side pressure by the
shank 9. fitting into the radial slot t.
The sides of the anvil l, over which the crank is bent, is provided with wings o, o,
pivoted therein, by removable pivots. The wings o, o, and the top of the anvil,
are provided with grooves similar to those in the die-blocks i, and ', suitable to
receive the rod which is to be formed into a crank. The wings o, o, may be
removed, and others, having a greater or less angle to their surfaces, be substituted
therefor.
To the outer end of the die-blocks i, are adjustably secured the hooks n.
The inner end of the die-blocks i, instead of being constructed as shown in
Fig. 6. may be made, as shown in Figs. 7-8 and 9, in which w, is the inner end of
the die-block i, pivoted at z, and having a wing moving in a groove, against the
edge of which, the projection ", on the pin 9, operates to throw the block w,
outward as shown by the dotted line, when the levers e, in which said die-blocks
are pivoted, are thrown upward; the pin g, being keyed fast in one of the ears of
the short arms, by the key u.
The process of bending a rod into a crank with this machine,
as follows:
The fevers e, e, are both thrown upward, and a rod m, suitably heated, passed
endwise between the die-blocks, and over the anvil.
The plunger c, is then forced down on the rod, and held there by the key d, which

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holds the rod firmly between the lower end of the plunger, and the surface of the
anvil.
The hooks n, being adjusted against the ends of the rod, the levers e, are pressed
downward, bending the rod over the extended wings of the anvil, until, as the
levers e, are still pressed downward, the die-blocks begin to travel in towards the
anvil, pressing the metal of the rod inward, and closing the wings o, upon the anvil,
and thus upsets the metal at the outer corners of the crank; the hooks n, also carrying
the rod inward, and upsetting the metal at the inner corner of the crank.
thrown
The levers e, being fully depressed; the key d, is removed, and the plunger
lifted away from the crank; the pins k, k, are removed and the levers e, e,
upward.
The anvil , and blocks i, may now be turned forward; the anvil shank g;
moving in the radial slot t; and the finished crank, removed from the machine.
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-
1st. In a crank bending machine, an anvil, having wings pivotally secured to the
same, and rotatable in the frame of the machine to allow of the removal of the
finished crank, and means, for bending the crank, as described.
2nd. In a crank bending machine, an anvil; a supporting frame; means for
holding the rod upon the anvil; levers, having short arms carrying pivoted die-
blocks, pivoted in said frame, and adapted to bend the rod into a crank, and upset
the same at the angles of said crank, as shown and described.
3rd. In a crank bending machine, the combination of a frame, having an anvil,
rotatable in its base; and a plunger, adapted to have a vertical movement over
said anvil; and levers, pivoted in said frame, whereby a rod, held between said
anvil and plunger, is bent into the form of a crank, and the metal upset, at the
angles of said crank; as shown and described.
Dated this 18th day of September 1891.