Improvements in Shifting Eccentrics.
Year: 1890

page_text: Date of Application. 4th June, 1890-Accepted, 5th July, 1890
COMPLETE SPECIFICATION.
Improvements in Shifting Eccentrics.
I, EMMA LILLIAN BRANCH, of Lawrence, in the county of Van Buren, and State of
Michigan, United States of America, Inventor, do hereby declare the nature of my
invention for IMPROVEMENTS IN SHIFTING ECCENTRICS and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement:-
The object of the invention is to provide a new and improved eccentric which is
simple and durable in construction, very effective in operation, and adapted for cutting
off at any desired point or for stopping or reversing the motion of the machine when-
ever desired.
The invention consists of a disk held to slide across the main shaft and inclines
mounted to slide and passing centrally through the said disk and turning with the
main shaft.
The invention also consists of certain parts and details and combinations of the
same, as will be hereinafter fully described, and then pointed out in the claims.
Reference is to be had to the accompanying drawings, forming a part of this
specification, in which similar letters of reference indicate corresponding parts in all
the figures.
Fig. 1 is a side elevation of the improvement.
Fig. 2 is a sectional face view of the same on the line
of Fig. 1.
Fig. 3 is a sectional plan view of the same on line y y of Fig. 2.
Fig. 4 is a sectional face view of the improvement on the line z z of Fig. 3.
Fig. 5 is a side elevation of the inclines with one of the rings removed and the
other in section, and
Fig. 6 is a face view of a modified form of the eccentric-disk.
On the main driving-shaft A of the machine to which the eccentric is applied is
secured a sleeve B, preferably made in two parts and secured by the clamps B¹ to
the said main shaft A. On the sleeve B are formed the parallel flat sides C, on
which fits the disk D, provided with an opening D, either straight or curved, but
passing through the centre of the disk. Through this opening pass the said flattened
parallel sides of the sleeve. When the latter is turned, the disk D is turned
with it, and at the same time is free to slide across the sleeve, and consequently.
across the main driving-shaft A. On the disk D is held, in the usual manner, an
eccentric strap E, connected with the slide-valve of the machine. In the two
sections of the sleeve B are formed, diametrically opposite each other, the longi-
tudinally-extending grooves F, in which are fitted to slide the inclines GG,
secured at one end of a collar H, mounted to slide on the sleeve B, and secured
at their other ends to a flanged collar I connected with a shifting lever for shifting
the same forward and backward so as to move the inclines G G forward and
backward in the grooves F of the sleeve B. The forward and backward motion of
the inclines is limited between the clamping collars B', which are held on the ends
of the sleeve B. Instead of making the latter in two parts it may be made in one
part, with the grooves F cut into the opposite sides. The inclines G fit into
recesses D2, formed in the disk D in the top and bottom of the elongated opening D¹,
so that when the inclines turn with the sleeve B they carry with them the disk D,
which is thus revolved and when in an eccentric position to the main shaft A imparts
a forward and backward sliding motion to the valve.
The operation is as follows:
When the eccentric is in the position shown in Fig. 2, the disk D is concentric with
the main shaft A, and consequently no eccentric motion takes place. The valve is
tlins at a stand still When the onerator desires to avarnto the valve ha chifts tha

page_text: flanged collar I to one side-say in the direction of arrow a-so that the inclines G
cause the disk D to slide outward into an eccentric position relative to the main
shaft A. When the main shaft is now rotated, the usual forward and backward
motion is imparted to the valve; but the motive agent can be cut off at any desired
point, according to the amount of eccentricity given to the disk D. When the
operator desires to reverse the machine, he moves the flanged collar I in an opposite
direction, so as to cause the inclines G to slide in the opposite direction to the
arrow a', whereby the disk D is moved in the opposite direction, and consequently
imparts a reverse stroke to the valve. Thus it will be seen that by merely moving
the inclines G the operator is enabled to stop the motion of the valve and to cut off at
any desired point or to reverse the engine whenever desired.
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 :-
1st. In an eccentric, the combination, with a sleeve adapted to be secured to a
shaft and having flattened sides and longitudinal slots, of sliding inclines fitting in the
slots of the sleeve and an apertured disk fitting on the sleeve and inclines substantially
as described.
2nd. In an eccentric, the combination with a sleeve adapted to be secured to a
shaft and having flattened sides and longitudinal slots, of a recessed and apertured
disk fitting on the sleeve and sliding inclines fitting in the slots of the sleeve and
recesses of the disk substantially as described.
3rd. In an eccentric, the combination of a sleeve adapted to be secured to a shaft
and having flattened sides and longitudinal slots in opposite sides at right angles to
the flattened sides, collars fitting loosely on the sleeve, inclines secured to the collars
and fitting in the slots of the sleeve, and a disk provided with an elongated opening and
recessed in the top and bottom of the said opening, substantially as herein shown
and described.
Dated 4th day of June 1890.
E. W. BARKER,
Applicant's Agent.