Improvements in and relating to Nailing Machines, and More Particularly to Machines for Nailing Boots and Shoes.
Year: 1889

page_text: Date of Application, 3rd Dec., 1889-Accepted, 4th Jan., 1890
COMPLETE SPECIFICATION.
Improvements in and relating to Nailing Machines, and More
Particularly to Machines for Nailing Boots and Shoes.
I, STILLMAN WILLIAMS ROBINSON, residing at Columbus, in the County of Franklin,
and State of Ohio, one of the United States of America, Professor of Mechanical
Engineering, 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 :-
My invention relates to nailing machines, and particularly relates to machines for
nailing boots and shoes.
The objects of my invention are, to provide a machine of this class of such
construction as to cause the driver to descend a definite and uniform distance when
striking the driving blows; to construct the same so that when once properly
adjusted it will remain permanently in adjustment; to enable the driver to make quick
and powerful blows in rapid succession ; to so construct the machine that the excess
of force of a blow remaining when a nail is driven shall be quietly and harmlessly
spent to insure the complete driving of the nail and to accomplish the same in a
simple, noiseless and effective manner.
These objects I accomplish in the manner illustrated in the accompanying drawings,
in which-
Figure 1, is a view in elevation of my machine ;
Figure 2, is a view at right angles with that shown in Figure 1, and-
Figure 3, is a view taken on line, x-x, of Figure 1.
This invention consists essentially of a driver-rod pressed downward by spring
tension and raised by a pitman and crank so arranged that when the crank is turned
past its upper dead centre it is released, and by tension of said spring is brought to
its lower dead centre or further, thus forcing the driver-rod against a nail placed in
such position as to receive the blow.
a, represents the standard or vertical frame of my machine which may be of any
desired form, but preferably has its upper portion, b, bent forward and thence
downward a short distance, as shown.
c, represents a crank having its shaft, c', pivotally supported in suitable bearings
formed in the body of the standard, a, at a point preferably slightly above and at one
side of an imaginary horizontal line drawn through the termination of the outer bent
portion, b.
Pivotally connected with the crank-pin, c², of the crank, c, which extends beneath
the bent portion, b, of the standard, is the upper end of a pitman, d, the pin, c³,
being of such length as to project a short distance through said pitman head, as
shown.
e, represents a shaft pivoted horizontally in the outer end of the bent portion, b, of
the standard and having mounted on its outer end a belt wheel, f. Made to project
from the inner end of the shaft, e, at right angles therewith is a finger or arm, 9,
preferably slightly curved, as shown, and of a length preferably slightly greater than
the main arm, c, of the crank.
The lower or outer end of the pitman is slotted or divided to receive the upper end
of a vertical driving-rod, h, which is pivoted therein and which being approximately
parallel with the standard, a, bears loosely in eyes formed in the outer ends of one or
more guide arms, a¹, projecting outwardly from the standard.
Made to extend from the standard at a point about opposite the lower end of
the pitman and in a direction at right angles with the guide-arm, a¹, and being
then bent forwardly in the direction of said arm, a', to a point beyond the pitman
head, is a rod, i. Coiled about the rod, i, and having its outer end rigidly secured
to the outer end of said rod is a coiled spring, k, the remaining or inner end of

page_text: which projects through the slot in the lower end of the pitman and rests upon the
head of the driving-rod, as shown. In the lower end of the driving-rod is formed a
socket into which may be inserted and held by one or more set screws or otherwise
a driving pin or head, m.
The work,, n, into which the nails are to be driven may be supported in such
position that the hammer may strike the nail by supporting the same against a
suitably shaped nose, p, made to project from the standard, a, to which it is secured,
or it may be supported in any other desirable way.
The standard, a, may be provided with a suitable foot or base which may rest
upon the floor, or may be formed as shown, with perforated or projecting ears or
lugs, g, by means of which the standard may be secured to a wall or post at any
desired height.
The operation of my machine is as follows:
Motion having been communicated to the belt wheel in the usual manner it will
be seen that the revolution of its shaft will cause the revolution of the finger, g,
fixed thereon.
:
For illustration, I will suppose the crank-pin, c, to be at its lower dead centre
and the finger, g, approaching it. The finger being in motion as above described
it will be seen that it will be brought into contact with the crank pin, c², and force
the latter upward until past its upper dead centre, at which point the tension of the
spring, k, will cause the crank pin to leave the finger and force said crank pin,
pitman and driver quickly downward.
This downward movement of said parts will cause the driver head, m, to descend
the exact distance, fixed and determined by the length of the parts, to drive home
the nail, r, which is supported in proper position to receive the blow.
If an excess of force is imparted by the spring the crank will pass its lower
dead centre and raise the driver against the spring until the crank is arrested when
it will return toward the lower dead centre and oscillate in decreasing ares until
at rest.
The continued steady motion of the shaft, e, will cause the finger, g, to soon again
come into contact with the crank pin, c², when the latter will be again raised and
another blow struck, as above described.
The nails are thus driven in rapid succession, suitable mechanism being employed
to feed the work along and to support the nails in position to receive the blows.
The work or shoe being nailed, may be mounted in the usual way on a jack,
or it may be supported on a horn.
In case a horn is used to support the work, which is stationary at a fixed
height above the floor, it may be necessary, on account of the thickness of
the work to be nailed, to release the frame and fix it at a higher or lower
point.
It is obvious that the herein described machine may be utilized not only for
driving loose nails, but for driving ordinary shoe pegs or nails formed from
continuous wire. It may be employed for any other purpose where it is desired
that quick, decisive blows should be struck.
It is also obvious that the finger, g, may be made shorter than shown, or of
such length that owing to its being held eccentrically with relation to the crank, c,
as shown in Figure 3, of the drawings, it will escape the crank pin before the
latter reaches its upper dead center and allow the crank to drop back again from
tension of the spring and thus produce the blow.
Other means than the herein employed may be used to impart motion to the
crank to raise the latter from its lower dead centre for the purpose of producing
the blow.
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-
:
In
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1.
1
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page_text: pitman, d, pivoted to said crank, and spring actuated driver, h, pivoted to said
pitman and passing through guides, a', with the driving shaft, e, pivoted as described
in the frame carrying on one end the finger, g, substantially as and for the purposes
described.
Second. In a nailing machine, the combination with a frame, a, crank, c,
pitman, d, pivoted to said crank, driver, h, pivoted to said pitman and operating
mechanism therefor of a spring, k, adapted to force said parts downward, substantially
as and for the purposes specified.
Third. In a nailing machine, the combination with a frane, a, crank c, pitman d,
pivoted to said crank, driver, h, pivoted to said pitman, the latter passing through
guides a¹, and operating mechanism therefor having a detachable head, m, spring, k,
supported on arm, i, said spring having its loose end bearing in the lower end of the
pitman, d, and upon the head of the driver, h, substantially as and for the purposes
specified.
Fourth. In a nailing machine, the combination with the frame, a, the crank, c,
pitman, d, pivoted to said crank driver, h, pivoted to said pitman and having
detachable head, m, spring, k, pressing upon said driver, with the driving shaft, e,
pivoted as above described, in the frame carrying on one end thereof the finger, g,
substantially as and for the purposes specified.
THIS O day
000T
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.