Year: 1889

page_text: Date of Application, 24th Sept., 1889-Accepted, 26th Oct., 1889
1 JABEZ DRAPER, of No. 323 Washington Street, in the City of Stockton, County
of San Joaquin, and State of California, one of the United States of America, Carriage
Builder, 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 improvements in motal punches. It consists in certain
details of construction which will be more fully explained by reference to the
accompanying Drawings, in which
Figure 1 is a vertical section taken through the dotted line y-y, and at right angles
with the fulcrum-pin of the operating lever.
Figure 2 is a vertical section taken through x-x, of Figure 1.
Figure 3 is a horizontal section on the dotted line 2-z.
My invention is shown, at present, as especially applicable to carriage and other
small work, and for punching plates not exceeding one-quarter of an inch in thickness,
but may be increased in size for larger work, if desired.
The standard or frame of the press is made in two halves A, A, which are of similar
shape and placed together so as to meet on a central plane, and these parts A, are
secured together by bolts B, passing through the sides of the two sections at three
points, as indicated, and when the nuts are turned up on them, they will be firmly
held together.
In casting these two halves, I form a depression or socket in each part to receive
the die D, which is secured in place by set-screws E, and nuts to prevent moving.
The depression in which the die is secured is made of such length that the die can
he reversed in it, the die having two holes of different sizes made through it, so that
these two holes in the die will correspond with the different sizes of punches which
are used by simply reversing the die without. other adjustment.
In the upper part of the head of the frame is fitted a device by which the punch is
reciprocated. It consists of a circular hoad F, having grooves or channels G, made
in each side and extending part way around, as shown in the drawing, and concentric
with the outer periphery of the head F.
The hole H for the fulcrum-bolt is made through the central portion of the head,
inside of the grooves G, and eccentric to these grooves and to the periphery of
the head.
1 is a cross-head or slide fitted into guides or channels J, which are formed in the
two halves of the frame A, so that this cross-head will move up or down vertically and
accurately in the guides.
The upper
end of this cross-head moves in contact with the chilled or hardened
surface of the eccentric and is forced down by it.
K. K ure two side bars, secured to the sides of the cross-head and fitting into the
corresponding slots or channels L, which are made deeper than the channels J,
as shown in the section, Figure 2, and they serve as guides within which the arms
slide.
At the upper ends of these arms, are the inwardly-projecting studs MI, which are,
preferably, made slightly oval in shape, and of such vertical diameter as to just fit
into the grooves or channels G, upon each side of the head F.
An extension N, projects from the head F, having a socket made in its outer end
for the reception of the handle by which the head is caused to rotate upon its fulcrum-
pin, and by the eccentricity of the head F, and the circular channels G, the cross-head I
is caused to rise and fall, traveling in the guides, as above described.

page_text: The channels G, are segmental, or have stops fixed in them which strike against the
studs when the handle thrown back just beyond a perpendicular, and thus hold it in
a convenient position to be grasped and brought forward.
The lower end of the cross-head I, is perforated, so as to receive the shank O of the
punch, which is secured in place by a set-scrow, as shown at P. The smaller end of
the punch is of such diameter that it passes into the corresponding hole made in the
die when forced downward; the plate to be punched being laid upon the die before
the punch is forced down.
Through the rear portion of the frame A, and centrally between the two parts
thereof, I make channels, as shown at R, and S, of Figure 1, and in these channels,
respectively, are placed the shank T of the stripper or pull-off as it is termed, and
the shank U of the gauge by which the distance of the holes from the edge of the
plate is determined.
The stripper extends centrally through the channel R, and its front end is bent
down, as shown at T', and formed so as to partially surround the lower end of the
punch and after the hole has been punched in the plate and the punch is withdrawn,
this device acts to pull the plate off from the punch.
In order to prevent the breakage of the point of the punch when withdrawing
it from the plate, which is, ordinarily, a frequent occurrence, I have made this
stripper T, adjustable up or down in the channel R, which is of greater depth than
the vertical thickness of the shank T, so that whatever thickness of plate may be
operated upon, the strippor may be moved up or down in a parallel plane, and not
moved up or down by turning about a fulcrum-pin, which would change the angle of
the lower surface by which the plate is removed from the punch:
This adjustment is made by means of strips of steel or wedges, as shown at V,
which are introduced into the slot R, either above or below the shank T, as the
thickness of the plate requires, and by thus moving the shank T, up or down
simultaneously throughout its whole length, I preserve the lower surface of the
part T, perfectly parallel with the die, so that when the plate is lifted up against it,
its pressure is exerted evenly upon the plate, and the punch is withdrawn in a straight
line without any tendency to twist so as to break itself off.
No fulcrum-pin or bolt is needed to hold the shank T in place.
The gauge U, by which the distance of the hole from the edge of the plate is
determined, is fitted into the hole S, which is made through the meeting-faces of
the two sides A, half of it lying in each side, so that when the parts are put together
a circular hole is formed.
The cylindrical shank U, passes through this hole and fits therein, and is held in
place by the set-screw W, screwing into one of the sides A, opposite the shank U.
The front end of the shank U, is cut away and extends out so that the part U¹ is
very much thinner than the diameter of the 'main portion of the 'shank U. This is
to allow it to be set forward as close as may be necessary to the punch O, when the
holes are to be punched very near to the edge of the plate, and also through
comparatively thin plates.
It thus allows the gauge to extend beneath the downwardly-curved portion of
the stripper or "pull-off", while allowing the main portion of the shank U, to be
of considerable thickness.
When it is necessary to punch the holes further from the edge of the plate, the
thin portion U, would not be as accurate a gauge for the plates, which might be
tilted by carelessness so as to slip over the top of the portion. 1, if it still remained
in the position shown in Figure 1.
1, therefore, loosen the screw W, and turn the shank U, one-quarter of a revolution
in its guiding-slot. S, which presents the gauge-portion U₁, in a vertical position or
with the edges up or down, which gives it a depth equal to or greater, if desired, than
the full diameter of the shank U.
This insures the gauge stopping the edge of the plate, and prevents the latter from
slipping over it, as above described.

page_text: Both gange and stripper being in the central portion, behind the die, present no
obstruction to the introduction of the plate, and they are easily adjusted, as above
described.
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
1. The metal-punching machine frame, made in two parts with a chamber to
receive the eccentric head, and guiding-channels for the cross-head, which transmits
motion from the eccentric to the punch.
2. The circular head with concentric channels made in its opposite sides, a fulcrum-
bolt-hole eccentric to these channels, a cross-head with arms and pins projecting
therefrom into the channels, so that the rotation of the head upon its fulcrum-pin will
reciprocate the cross-head and punch.
3. The stripper having a shank fitted to a channel in the frame, and wedges for
adjusting it up or down.
4. The gauge-shank, movable horizontally in a hole in the frame, and adjustable
by turning, for different thicknesses of metal, and a locking and holding-screw, as
shown.
Dated this Twantre fourth dog of Santambar 1880
For the Applicant,
W. E. GEDGE,
Agent.