Improvements in Linkwork for Increasing and Transmitting Motion.
Year: 1889

page_text: Date of Application, 31st Dec., 1889-Accepted, 31st May, 1890
COMPLETE SPECIFICATION.
Improvements in Linkwork for Increasing and Transmitting
Motion.
I, JOHN ASSARIAS ZERBE of No. 420 Chestnut Street Dodge City in the County of
Ford and State of Kansas, United States of America, Inventor, do hereby declare
the nature of my invention for IMPROVEMENT IN A MULTIPLE MOVEMENT DEVICE,
INCREASING AND TRANSMITTING MOTION, 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 a device for transmitting power, baving for its object to
increase the length of the stroke of a piston-rod, drive-rod, lifting rod of a pump, or
any other reciprocating rod; furthermore the object of my invention is to enable the
power of such reciprocating rod to be transmitted in any desired direction or
directions.
In the drawings, which illustrate the manner of constructing and applying my
invention,
Fig. 1 is a top plan view, showing the position of the parts before the stroke is
made;
Fig. 2 is a central longitudinal section, showing the parts in the same position as in
Fig. 1;
Fig. 3 is a plan view, showing my device connected to a crank-wheel, with the
parts as seen when the stroke is completed;
Fig. 4 is a detail perspective view, showing the construction of the elbow joint
which is employed to connect the members of the extension motor-rods;
Fig. 5 is a detail view of the rack-bar M ;
Fig. 6 is a similar view of the gear-wheel L and the shaft through which it is
secured;
Fig. 7 is a similar view of the movable guide-plate;
Fig. 8 is a similar view of one of the guide-blocks;
Fig. 9 is a view of one of the flanged guide-rollers ;
Fig. 10 is a plan view of the improved motor-bar connected directly to a crank-
wheel, as in Fig. 3, as seen when about to commence a new stroke ;
Fig. 11 is a perspective view of the stationary, slotted bed-plate;
Fig. 12 is a detail view of the guide-plate B, having shorter guide slots, to
adapt it to be secured permanently to the bed plate ;
Fig. 13 is a detail view of the distributing spider, which is employed to transmit
the power in various directions ;
and
Fig. 14 is a similar view, partly broken away, of the slotted guide for said
spider.
The extension motor-device is composed of a series of intersecting bars C which
are pivoted together at their extremities, as seen at c, and at their centers, are
pivoted to each other, which operate in the central guide slots F of the bed plate A
as represented in fig. 2. The bars (2 at one end of the motor device do not intersect
at their centers, but are connected at their ends by the vertical bolt I, which also
passes through and secures in place a guide-block a' which operates in the guide
slot F, and the intersecting bars at the opposite end of the motor-device are extended
to form the power arms", which are provided at their extremities with flanged
guide-rollers P, which operate in the diverging guide-slots D D of the movable
guide plate B.
In the drawings I have shown my improved extension motor device connected
to the piston rod H, which operates in the cylinder h, in order to illustrate the
manner of using the same, and 1 have also shown the same, as in Figs. 3 and 10,

page_text: :
connected to a crank-wheel i, mounted on the shaft 2, by means of crank 3 and
pitman G; but these parts form no element of my invention.
The piston rod is connected to the fulcrum pin d upon which the power arms are
pivoted, said pin being also employed to secure a guide block a' in place.
A slack or connecting bar E is arranged above the motor-device, and is secured
thereto at one end by the fulcrum pin d; the opposite end of said bar being
slotted as seen at E¹, to receive the bolt I, whereby when the said motor-device is
extended the bolt I operates in the slot E.
Beneath the bed-plate is arranged a rack-bar K, which is secured at one end by
a bolt d and is secured at its opposite end to the guide block a which slides freely
in the slot F by means of bolt 1. This rack-bar meshes with a pinion L mounted on
a horizontal shaft f, and the pinion, in turn, meshes with a rack M, which is secured
at one end of the guide-plate B by means of the threaded extension e; which slides
in the parallel guide-slots G G of the bed plate, the front end of said rack being
also provided with threaded extensions e, engaged with suitable nuts, and which slides
freely in slots G G.
It will be seen that the forward motion of the piston, being communicated through
the motor-device to the rack bar K will cause a rotation of the pinion L, thereby
moving the rack M in the opposite direction, thereby sliding the guide-plate B rear-
ward and causing its divergent slots D to draw the free ends of the power arms ("
toward each other, thus extending the motor-device.
t
Obviously the forward end of the motor-device will by this combined motion,
travel a greater distance than the piston rod, said distance corresponding to the
length of the slot E. The bolt I travels in the slot E¹ during one stroke from t to s,
or from s to t, said distance being the difference between the stroke of the inotor-
rod and the stroke of the piston.
The spider which is connected to the end of the motor rod to distribute the motion
in various directions, consists of a series of intersecting bars, connected in the same
manner as those of the motor-device, its arm 0¹ being connected to the end of the
motor rod by means of the slack bar E, and its other arms 03, 0³, and O* being
connected together by the intersecting bars n n, which intersecting at a convey
power to all of said arms. A frame A is employed to guide the movements of the
arms, the same being provided with slots A³ to receive guide-blocks, as illustrated in
connection with the motor-device.
The arm O is provided at its extremity with pins 4 5, Fig. 1 which operate in the
slot E¹, and the bolt I, coming in contact with the end of the arm 0¹ contracts the
spider, while the end of the slot E, on the return stroke, coming in contact with
the pin 4 on the arm O' extends the same by drawing pin 4 away from the pin X'.
The spider is permanently pivoted at its center to the central portion A of the guide
frame by means of the pivot a¹. Arm O¹ of the spider may be operated by rod J
"connecting the bolt 1 with any one or other of the intersection of the bars of that
arm the rod J may be located below the slack bar E as represented in Fig. 1 or
above that bar as represented in Fig. 2.
When only a moderate extension of the motor-device is required the rack-bars and
pinion are dispensed with, and the slot-plate B is permanently fixed to the bed plate
in such a position as to guide the movement of the free ends of the power arms, and,
as in this case the movement of the motor device is less, the slots D of the plate B
are made much shorter, as shown in Fig. 12 of the drawings.
The joint which I prefer to employ to connect the members of the motor-device, is
shown clearly in Fig. 4, and it consists essentially in rounding and halving the
adjacent ends of the adjoining members and connecting them by a pivot c, the outer
edges of the rounded ends T being chamfered or beveled, as seen at v, to fit in
correspondingly-shaped shoulders of the adjoining member. With these joints there
is less liability to spring away from the bed plate, and the device operates with greater
trueness and certainty.
The operation of the invention will now be seen. As the piston-rol advances, the
slack-bar and the extension motor-device are forced forward, the guide plate is carried

page_text: rearward, and the flanged guide-rollers P, operating in the divergent slots D D, are
drawn towards each other; thereby extending the motor-device and increasing the
stroke, which is communicated directly to the pitman, as shown in Figs. 3 and 10, or
is communicated to a distributing spider, the various arms of which may be connected
to as many pitmen or other bars, rods, or cranks in a manner to be determined by
the object to be attained.
In Fig. 13 is shown a spider, which in addition to the four arms shown in Fig. 1,
is provided with an upper arm 08 and a lower arm 0, the near ends of which are
connected by means of the arms to w to slotted lugs ss. The operation of this
form of spider is the same as that described in connection with the spider shown in
Fig. 1.
The guide blocks a¹ are secured to the motor-device by means of vertical pins or
rivets 99, and said blocks are flanged to work in the slot F and thereby hold the
motor-bar in its proper position. The form of guide blocks a. a¹ and a² is
represented in Fig. 8.
The object of the slack-bar is to take up all slack or lost motion, caused by the
wear of the pin I in the slot E', and also to strengthen the motor-device.
Similar guide blocks g g on the under side of the movable guide-plate B operate
in the parallel guide-slots G G of the bed-plate, as shown in dotted lines in
Figs. 1 and 10.
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 combination of an extension-motor-device, adapted to be connected to a
piston-rod or other reciprocating bar, and provided with power arms, and the guide
plate provided with divergent slots to receive guide-rollers, on the extremities of said
power arms, to extend and contract the motor-device, substantially as specified.
2. The combination of an extensible motor-device, consisting of intersecting bars
pivoted together, the movable guide plate geared thereto to move in the opposite
direction, and the power arms on the motor-device provided with guide-rollers, to
operate in divergent slots, in said guide-plate, substantially as specified.
3. The combination of the extension motor-device, consisting of a series of inter-
secting, pivoted bars, the rack-bar K, carried by said motor-device, the pinion, the
slotted guide-plate connected to a rack bar M which meshes with the said pinion,
and the power arms on the motor-device provided with guide rollers, to operate in
divergent guide-slots in the said plate, substantially as specified.
4. The combination of the motor-device consisting of a series of intersecting pivoted
bars, C, and carrying depending guide-blocks a', the slotted bed-piate, the movable
guide plate provided with divergent slots D and geared to said motor-device, said
guide-plate being provided with lugs to operate on the slots in the bed-plate and the
power arms provided with guide rollers, to operate in said slots D, substantially as
specified.
5. The combination of the extension motor device, as described, and provided with
power arms C, the slack bar connected to the motor-device and slotted to receive a
rod I on the same, and the guide-plate geared to the motor-rod and provided with
slots to receive guide-rollers on the extremities of the outer arms, substantially as
specified.
6. The combination of the extension-motor-device, slack-bar E, provided with
slot E, a spider having a series of divergent arms consisting of intersecting bars and
provided with pins to operate in the slot E¹, substantially as specified.
7. The combination of the extension-motor-device, provided with power arms (",
the sliding slotted guide-plate connected to said arms and geared to the motor-device,
to operate in the opposite direction thereto, the slotted slack bar E, the slotted guide
frame A³, and the spider mounted on said frame, having divergent arms, and con-
nected to the motor-device, substantially as specified.
8. The combination of the bed-plate A provided with parallel guide-slots G G F,

page_text: the sliding guide plate provided with divergent slots D D and having lugs 9 9 to
operate in said slots G G, the motor-device consisting of intersecting, pivoted hars
and provided with guide-blocks a¹ to operate in the slots F, said motor-device being
geared, to said guide-plate and provided with power arms having guide rollers, to
operate in the slots D thereof, and a slack-bar connected to the motor-device and
provided at one end with a slot to receive a guide-bolt I, substantially as specified.
Dated this 19th day of December 1889.
RAYNER & CASSELL,
37, Chancery Lane, London, Agents for the Applicant.