Improved Means for Producing Oscillating Motion.
Year: 1892

page_text: Date of Application, 7th June, 1892-Accepted, 16th July, 1892
SORATRICATION
[Communicated from abroad by ALFRED BUCKINGHAM WILLCOX, of 512,
Washington Boulevard, Chicago, County of Cook, State of Illinois, United
States of America, Mechanical Engineer, and EDWARD LODER WHITTE-
MORE, of Toledo, County of Lucas, State of Ohio, United States of America,
Manufacturer.]
Improved Means for Producing Oscillating Motion.
I, HENRY HARRIS Lake of the firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex 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, reference being made to the accompanying drawings forming part
of this Specification, and in which
Figure 1, represents a face view of the movement showing the parts in what are
termed the down position.
Figure 2, the same as Figure 1, showing the parts in the position when the
shaft is midway between its extreme movements.
Figure 3, the same as Figure 1, representing the parts in the position as when
the shaft is at its other extreme from Figure 1.
Figure 4, the same as Figure 1, representing the parts in the position as when
the operating shaft commences its return movement.
Figure 5, side view of the apparatus looking from the left of Figure 2.
Figure 6, top view of the same.
This invention relates to an improved device for mechanical movement, adapted
for use in various machines in which a reciprocating or rotative movement is
required with a rest or dwell for a predetermined length of time at one point of the
movement. Such requirements are found in power-presses, punching-machines,
power-shears, and mechanical feeds for various purposes. The mention of these
will be sufficient to illustrate the general application of the movement, and the
invention consists in the construction and combination of elements as hereinafter
described and particularly recited in the claim.
As the present invention is an addition to the mechanism shown and described in
an application filed in even date herewith, we will first describe the mechanism as
it
appears in the said application, and then point out the additions which have been
made for the improvement of the same.
A, represents the driving-shaft, to which a continuous rotation may be imparted
in the direction indicated by the arrow.
Made fast to the shaft and so as to revolve
with it, is a crank B, and on this crank two crank-pins C D, are arranged, both
being in the same radial line of the crank, but the pin D, more distant from the
center of revolution than the pin C, and as clearly seen in Fig. 1. E, represents a
shaft to which an oscillating movement is given, and from which the power to
operate the mechanism is to be imparted. The axis of the shaft E, is parallel with
the axis of the shaft A, and from the shaft E, an arm F, projects, in a plane
parallel with the plane of the crank B, and as here represented, the face of the
arm F, is in the same plane as the face of the crank B, as seen in Fig. 5. From
the arm F, a crank-pin G, projects, the axis of which is parallel with the axis of
the two pins CD, and of a length substantially equal to the two pins CD.
connection is made between the pin C, of the crank B, with the pin G, of the
arm F, by a connecting-rod H, the rod being provided with a predetermined extent
of lost motion on one pin or the other, here represented as by a slot I, on the
A

page_text: pin C, the slot being of a width corresponding to the diameter of the pin C, but
of a length greater than that of the diameter of the pin.
A second connecting-rod J, in like manner connects the crank-pin D, with the
pin G, the rod J, being constructed with a slot K, in which the pin D, works, and
so that a predetermined extent of lost motion will be permitted between the crank-
pin D, and the pin G.
The arm F, is of somewhat greater length than the length of the crank B, and
owing to the lost motion occasioned by the slots I K, in the respective connecting-
rods, an oscillating movement only will be imparted to the arm F, from the
continuously revolving crank B.
In Figure 1, the arm F, is represented as in its extreme down position. In this
position the pins stand in a direct line between the center of the shaft A, and the
center of the crank-pin G, in this position the crank pin D, stands at the extreme
lower end of the slot K, in which it works, at the same time the crank-pin C,
stands at the extreme upper end of the slot in which it works, so that in this
position there is a positive engagement between the crank and the armi F, in both
directions, so that the arm F, will be practically held firm, that is, will be forced
to its down position by the pin D, and prevented from passing beyond that position
by the pin C.
Starting from this point Figure 1, the shaft A, with its crank B, revolves in the
direction indicated by the arrow, the crank-pin C, working against the end of its
slot most distant from the pin G, of the arm F, will draw the arm F, with the
crank, as indicated in Fig. 2, at the same time the pin D, has moved from the end
of the slot nearest the pin G, and is approaching the other extreme of its slot K.
The position Figure 2, is substantially midway between the two extremes of move-
ment of the arm F.
The crank B, continues its revolution as indicated in Fig. 3, until the centers of
the pin G, the shaft A, and of the crank-pins CD, again come into line but with
the pins CD upon the opposite side of the shaft A, and as seen in Fig. 3, at this
point the pin D, has reached the outward extreme of its slot, while the pin C, still
remains in the same position in relation to its slot in which it started, and this is
the extreme up position of the arm F.
As the shaft A, and crank continues the revolution from the position seen in
Fig. 3, if the arm F, be held firm, the pins C D of the crank will carry the
links over with them, but the pins C D, approach the pin G, and recede from
the extreme outer end of their respective slots, and as seen in Fig. 4, this move-
ment of the pins C D continuing, the pin D, first reaches the extreme inner end
of its slot, and until that point is reached, neither of the crank-pins C D have
any effect upon the arm F, but after the pin D, comes into engagement with the
inner end of its slot, as seen in Fig. 4, then the power of the revolving crank will
be communicated to the arm through its link J, to the arm F, to commence a
return swinging movement of the said arm F.
To hold the arm F, firmly during the time in which the crank-pins are passing
from the extreme outer end of the slot, so as to obtain a bearing upon the inner
end of one of the slots, a segment L, is made fast to the arm F, the outer surface
of which is concentric to the shaft A, when the arm is in the up position, as seen
in Fig. 3. The crank B, is constructed with a projection M, from which a pin or
friction-roll N projects towards the links, the distance of the pin or roll N, from
the shaft A, corresponds to the outer surface of the segments L, when the arm is
in the up position, and as seen in Fig. 3, and the length of the segment L, is such
that as the arm reaches its extreme up position, as seen in Fig. 3, the pin N, in the
rotation of the shaft A, will have just reached the upper end of the segment L, and
then continuing, will pass onto that segment, until the point when the crank-pins
commence their action upon the arm F, is reached, and as seen in Fig. 4, at this
point the pin N, escapes from the segment L.
As the surface of the segment corresponds to the path of the inner surface of
the pin N, that pin takes a bearing upon the face of the segment, and rides upon

page_text: that surface, thus holding the arm F, firmly in the up position from the time the:
pin passes onto the segment, as seen in Fig. 3, until it escapes therefrom, as seen.in.
Fig. 4.
The pin N, having escaped from the segment, as seen in Fig. 4, the continued
revolution of the shaft A, through the pin D, imparts the downward movement to
the arm F, until the extreme down position is reached, as seen in Fig. 4, at which
time the outer end of the slot I, of the connecting-rod H, will have come into.
engagement with the pin C, and as seen in Fig. 1, and so that when that point.is
reached, the upward movement of the arm F, will immediately commence.
The shaft A, making successive revolutions will impart a corresponding vibratory
movement to the arm F, and consequent oscillatory movement to the shaft E, but
because of the lost motion between the crank of the shaft A, and the arm F, the
arm F, will remain inactive during a portion of the revolution of the shaft A,.
corresponding to the extent of the said lost motion, thus making the oscillatory
movement of the shaft E, intermittent.
Thus far the mechanism is the same as that described in the application before.
referred to.
The object of our present improvement is to hold the arm F, more rigidly during
its movement than can be done where dependance for such support it had upon.
the slotted rods which connect the crank with the arm. That side of the arm
next the crank and the periphery of the crank itself, are made of cam shape,
corresponding to the line of contact between the crank and arm during the move-
ment of the arm described. The curves of the crank and of the arm to produce
this result, are clearly shown in the several figures, consequently the arm F, bears
against the crank throughout the entire revolution of the crank, or nearly so, and.
is therefore as firm as if the arm were operated by a single pitman and without the
slotted connectious described, and yet the desired dwell or rest of the arm F,.
without the interruption of the crank is the same as without such contact, and as
in the before mentioned application.
As arranged in the before mentioned application, the return movement of the arm
after the dwell, commences as the crank-pin strikes the end of the slot, consequently
there would be more or less of a blow imparted by this pin upon the end of the
slot, and the start of the crank on its return would be sudden. To avoid this blow
and make the start of the crank easy, we construct the end of the arm as at O, and
construct the crank with a corresponding surface P, which as the crank revolves,
will come gradually onto the surface O, slightly before the crank-pin reaches the
end of the slot to start the arm; the result of this is that the crank gradually
starts the arm so that the arm commences its movement before the crank-pin has
reached the lower end of the slot, and so that the crank-pin comes upon its end of
the slot while the connecting-rod and arm are moving, and thereby avoids the blow
or sudden start which would be the natural result of the start produced by the
crank-pin as before described.
The crank may be constructed with the cam surface P, and the arm with a
corresponding bearing surface O, and so as to produce the gradual start on the
return of the arm, as we have described, without the continuous contact between
the crank and arm described.
The various purposes to which this mechanical movement is adapted, are fully
set forth in the before mentioned application, and it is therefore deemed unnecessary
to further refer to such uses in this application.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents I declare that what I claim is :-
First. The combination of a revolving shaft carrying a crank, having two
crank-pins in the same radial line, but one more distant from the center of motion
than the other, an oscillating shaft, an arm projecting radially from said oscillating
shaft and in substantially the same plane as the plane of the said crank, the said

page_text: arm carrying a projecting crank-pin, two connecting rods arranged on the crank
pin of the said oscillating shaft, the said connecting-rods joined respectively to two
crank-pins on the said revolving shaft, the said connecting rods constructed for a
predetermined length of lost motion between the crank-pin and the oscillating shaft
and the two crank-pins of the revolving shaft, the periphery of the crank and the
adjacent surface of the said arm curved corresponding to the points of contact
between the said crank and arm in the revolution of the crank, substantially as and
for the purpose described.
Second. The combination of a revolving shaft carrying a crank having two
crank pins in the same radial line, but one more distant from the center of motion
than the other, an oscillating shaft, an arm projecting radially from said oscillating
shaft and carrying a projecting crank-pin, two connecting-rods arranged on the
crank-pin of the said oscillating shaft, the said connecting rods joined respectively
to the two crank-pins on the revolving shaft, the said connecting rods constructed
for a predetermined length of lost motion between the crank-pin of the oscillating
shaft and the two crank-pins of the revolving shaft, the crank constructed with a
cam surface P, and the arm with a corresponding bearing surface O, the said
surfaces adapted to come gradually together as the return movement of the armı
commences, substantially as and for the purpose described.
Dated this 7th day of June 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.