Improvements in Machines for Making Joints with Metal Clamps.
Year: 1893

page_text: Date of Application, 1st May, 1893-Accepted, 17th June, 1893
COMPLETE SPECIFICATION.
Improvements in Machines for Making Joints with Metal Clamps.
I, NEWNHAM BROWNE of 73 Cheapside, in the City of London, Chartered
Patent Agent, do hereby declare the nature of this invention, and in what manner
the same is to be performed which has been communicated to me by Joseph
Temler of 15 Ogrovowa, Warsaw in the Empire of Russia, Manufacturer, to be
particularly described and ascertained in and by the following statement :-
In comparison with other machines for similar purposes, the one hereinafter
described presents this impyement, that in making the joints it uses clamps which
are fed to it ready bent, as in Figs. 1 and 2, and stacked one over the other
as seen in Figs. 3 and 4.
The machine is shown in
section and is constituted as
በሰ
DE
5 in transverse section and in Fig. 6 in longitudinal
ows:
:-
Above the framing G a two armed lever is arranged and actuated by a pitman
or connecting rod s operated by a pedal.
The lever à acts upon a plunger a guided in the framework and the lower end
of the plunger is surrounded by a movable sheath & maintained in its lowermost
position on the plunger'a by spring c.
The last or
At the back of plunger a the clamp hopper or receptacle d is provided, into
which are introduced the clamps stacked as shown in Figs. 3 and 4.
lowermost clamp rests on the bottom of the clamp hopper by its arms and is then
at such level as is required to permit its introduction under the plunger. A slide e
bearing against the clamp from the rear and moving forward horizontally serves
at the right moment to introduce the clamp under the plunger a and into the
sheath b.
fis the bed plate for receiving the plates or sheets to be connected it is
vertically movable on a suitable mandrel and spring i serves to retain it in its
highest position.
i
The machine shown in the drawings is intended to make corner-joints consequently
the working face of the plunger a, mandrel g and the bearing surface of the parts d,
form angles. If the machine is to make flat joints, these parts are straight, in all
other respects the machine retains the construction shown."
The operation of the machine and the improvements effected therein will be
understood from the following
When starting the machine the plunger a remains at rest until slide e has by
moving forward, puthed the lowermost clamp under the plunger a and into the
sheath b. In the drawings this motion is supposed to be imparted to the slide by
the connecting rods provided with a cam or incline s¹ for this purpose. The
slide e might however equally well be actuated by some other moving part of the
machine.
In the sheath 6 the clamp when pushed in meets a laterally enlarged part adapted
to the diverging position of the arms of the clamp. From the said lateral enlarge-
ment downwards the sides of the sheath gradually approach one another until they
are again parallel. At the lower edge of the sides that guide the clamp-arms there
are small projections 61. The interior faces of these (towards the sheath) of these
projections bare bevelled.
At the moment when the clamp, has arrived under the plunger a (as shown in
Figs. 5 and 6) the plunger a together with the sheath b. surrounding it is moved
towards the plates, sheets, or boards laid on the bed plates f for the purpose of
being joined. So soon as the sheath 6 strikes the plates it is forced to stop whilst
the plunger a continues to move descending within the sheath. In this movement
the plunger pushes the clamp under it forward and by reason of the gradual

page_text: narrowing inner faces of the sheath, the clamp arms assume a direction parallel to
the straight sides of the latter or in other words, the arms of the clamp that
previously were divergent, become parallel. The points of the clamp now reach
the projections and these bend the clamp arms inward when the latter proceed
downwards.
In consequence of such bending the clamp points meche plates (which for
corner joints are at 45° as shown in the drawings) approximately at right angles
or in the position 'most favorable for penetration as will be een in Fig. 7.
For the production of flat joints the projections & on sheath b are so diminished
or the effective bevel of the same made of so sharp an angle that they produce a
slight inward bending only of the points, such as is desirable for the subsequent
bending over of such points.
As long as the points have to penetrate into the places boards or sheets to be
converted, they are subject to the bending of thejections 1. In this shape
(for the better maintenance whereof the correspon ng edges of the plates fare
slightly bevelled) the clamp arms pass through the boards or plates into the space
over the mandrel g, see Fig. 8.
As the spring carrying the plates f is more I-
rful than that which acts on
the sheath (spring c) the bed plates will remain raised until the plunger a
with the clamp under it bears against the plates or sliects to be connected, after
that the entire pressure exerted upon the plunger a acts on the bed plates also and
overcoming the power of spring i drives the latter down. In this operation the
parts of the clamps projecting below and bent inwardly are forced against the
mandrel g. and the latter, without any intermediary gearing first drives them
further inward, as shown in Fig. 9 and then against the inner faces of the plates,
sheets or boards, so that the points slightly enter into the same as indicated in
Fig. 10.
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
1. The transference of the clamps stacked as shown in Figs. 3 and 4 in a
receptacle d, from such receptacle into a sheath & surrounding the plunger a by
which latter the clamps are inserted by means of a slide e Fig. 6 operated by the
machine.
2. The bevelled projections provided at the lower inner edge of the sheath b.
receiving the clamps transferred by slide e the interior bevel of which projection
serves to bend the arms of the clamps inward when the same are pushed down in
the sheath 6 by the plunger a.
1
3. The lower part of the machine (Figs. 5 and 6) consisting of a fixed mandrel g,
bed plate maintained thereon by spring i, the space above the mandrel y in such
lower part serving to accommodate the points of the clamps when they passed
through the plates or boards to be connected and are bent inward (Fig. 8) whilst
when the bed platef descends under the impulse of the plunger a the clamp arms or
points strike the mandrel g are bent further inward as shown in Fig. 9 and finally
forced into the boards or plates as indicated in Fig. 10.
Dated the 29th day of April 1893.
NEWNHAM BROWNE.