Improvements in Toggle Mechanism.
Year: 1891

page_text: Date of Application, 10th Mar., 1891-Accented, 18th Apr., 1891
COMPLETE SPECIFICATION.
Improvements in Toggle Mechanism.
I, HENRY DORSEY MENTZEL, of 869, Harlem Avenue, in the City of Baltimore
and State of Maryland, United States of America, Manufacturer, do hereby declare
the nature of my invention for "IMPROVEMENTS IN TOGGLE MECHANISM," 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 this invention is to produce in a machine, apparatus or combination
of mechanical appliances, a noiseless reciprocating movement; and it relates to
what I terin, a spring toggle, that is to say, a toggle without the usual knuckles
or joints which wear and become loose.
My improved spring toggle, in its simplest form, consists in a spring bar having
one end thereof held so as to prevent its movement, and the other end loose and
attached to the object to be moved, combined with a moving device of any appro-
priate description, which is applied to the side of the bar at a point between the
ends thereof, and operated or moved in a direction transversely of the said bar to
deflect it from its normal shape, and thus by practically shortening or lengthening
the bar, cause its loose end to have an end wise motion which is communicated to the
object to be vibrated or shaken.
The motion effected as described is noiseless, and is particularly useful where a
rapid short reciprocating stroke is required.
The elementary spring toggle as specified, is susceptible to a great variety of
modifications, several of which will be hereinafter described, and it is generally
used in connection with another toggle of a similar character, in order that the object
to be reciprocated may be better supported.
The spring bars may be straight, curved or semi-circular in shape, and separated
at their ends or connected, but in all cases movement is applied to them in a direction
practically at a right angle with the direction of movement of the driven or movable
device.
In the further description of the said invention which follows, reference is made
to the accompanying drawing, forming a part hereof, and in which,
Fig. 1 is a side elevation of the invention in its simplest form and illustrating
the application of a straight spring toggle to a block or weight which is to be
vertically shaken.
Fig. 2 is a partly sectional side view of a pulp screen such as is used in the
manufacture of paper, supported and operated in accordance with my invention,
and
Fig. 3 a top view of the same.
Figs. 4 to 15, inclusive, illustrate modifications in the construction and
arrangement of the invention, as applied to pulp screens, and hereinafter fully
described.
Fig. 16 is a top view of a Fourdrinier wire and some of its connections, as
employed in the manufacture of paper, and shaken by means of my improved spring
toggle; and
Fig. 17, an end view of the same with the wire cloth removed.
Referring to Fig. 1, A is a spring bar secured at one end to a fixed support, B,
and at the other end connected to a block or weight, C, which constitutes the
device to be reciprocated in the direction indicated by the arrows.
D is an
eccentric or cam so placed that its short side is in contact with the spring bar when
the same is straight, and adapted for revolution about the centre a.
As the full part of the eccentric is turned to the spring bar the same is deflected
from a straight line and the block or weight C which is guided by the devices, b,

page_text: is drawn down. The dotted delineation of the said parts illustrates this change in
position.
As the eccentric assumes its original position the spring bar returns to its normal
shape, and the weight or block is elevated. By a rapid revoluble motion of the
eccentric, the spring bar may be made to effect a rapid reciprocating movement of
the block or weight, C.
Referring to Figs. 2 and 3, which show the invention as applied to a pulp screen,
E is the frame or stand of the machine, which supports the vat, F. G is the pulp
screen having the usual perforated bottom, situated in the vat, with its lower edge
below the surface of the pulp which is designated by, c.
HH are spring bars preferably of steel, the upper ends of which are secured to a
projection, d, on the screen, and the lower ends, to a portion of the frame, E.
I is a revoluble shaft sustained in any suitable manner by the frame, E. On this
shaft are fastened the eccentrics, e and f, placed in diametrically opposite directions
as regards their full or operative sides. These eccentrics are provided with
straps, and, and rods, i and ), which unite them with the spring bars, H.
The shaft, 1, extends entirely across the machine, and at its far end is provided
with a set of eccentrics, spring bars and other attachments corresponding with those
described, and also with a driving pulley adapted to be revolved by means of a belt,
all of which are omitted from the drawing. When the shaft, I, is in revolution,
the spring bars are alternately drawn together or deflected from their normal shape
and then returned to their original position. In the deflection of the bars, from a
straight line, the pulp screen is drawn down, and when they are straightened it is
elevated. This reciprocating movement is executed rapidly.
In Figs. 4 and 5, the springs instead of being straight bars are curved, and placed
so that their ends flare outward at the top and bottom; and they are reinforced at
the centre by means of plates to stiffen them, after the manner of carriage springs.
Instead of the shaft carrying eccentrics, as in the construction shown in Figs. 2
and 3 it is provided with a cam at each end which cam bears against the inner
surface of the springs. With this arrangement, the bars are straightened and the
screen raised by the action of the cams, and the return movement is effected by the
springs assuming their original positions in tollowing the retreating surfaces of
the cams.
In Figs. 6 and 7, the spring bars are curved outward instead of inward as in
Figs. 4 and 5, and the eccentrics and rods shown in Figs. 2 and 3 are employed to
straighten the flexible bars and elevate the screen; the downward motion, as in the
construction shown in Figs. 4 and 5 being obtained by the springs assuming their
original position.
In Figs. 8 and 9, the curved spring bars are of semi-circular shape, with their
ends brought together at the top and bottom, so that the springs form a complete
circle. The elevation in this case is effected by securing one spring bar to a
bracket, J, and providing the other with a block, I, against which an eccentric or
cam is adapted to bear in one part of its revolution. In this modification of the
invention, only one spring bar is actually moved by the cam, but the effect is the
same, as in compressing one bar, the other is similarly effected.
In Figs. 10 and 11, the circular form of spring is maintained, but its deflection
is effected by the action of a cam or eccentric on a straight flexible bar, K, tied to
the semi-circular bais by means of lugs, n, and bolts, o.
In Figs. 12 and 13, four semi-circular spring bars are employed, and the operative
cam is situated between the two inner bars.
The outer bars are held to prevent outward movement by means of straps, p, from
the frame.
In Figs. 14 and 15, two semi-circular spring bars are used, and they are both
subjected to the action of a cam or eccentric.
The two eccentrics are made to act together by means of a gear wheel, M, on
each shaft and a connecting one between them.
Referring to Figs. 16 and 17, which as before stated, illustrate the invention

page_text: applied to a Fourdrinier wire of a paper making machine, N is the frame of the
machine which supports rollers, O, one only of which is shown. P is a wire cloth
endless apron which passes around the rollers, O, and which with them has to be
shaken laterally. Q represents the toggle bars which at one end are secured to a
bracket g, forming a part of a column, R, seated on the floor. The other end of the
toggle bars are connected to the frame of the wire by means of a connecting rod, r,
and a stand, s. Between the toggle bars is situated a cam, t, on a shaft u, provided
at its outer end with a driving pulley.
The alternate opening and closing of the toggle bars effect a shake to the
Fourdrinier wire which is noiseless.
It is evident that the present invention can be applied to various other devices
requiring a short reciprocating motion, too numerous to mention.
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. A toggle to effect a reciprocating motion, which consists of a spring bar
secured so as to be immovable at one end, and at the other end attached to the
device to be reciprocated, combined with a deflecting device which is applied to the
said bar at a point between the ends thereof, substantially as, and for the purpose
specified.
2. In combination with the frame or some other stationary part of a machine,
spring bars connected at their ends to the said frame and also to some device to be
reciprocated, and means for deflecting intermediate portions of the said spring bars
in a direction practically at a right angle with the line of movement of the said
driven device, substantially as, and for the purpose specified.
3. In combination with the frame or some other stationary part of a machine,
spring bars connected at their ends to the said frame and also to some device to be
reciprocated, a revoluble shaft situated between the said bars carrying eccentrics
whereby in the revolution of the said shaft, the springs are deflected from their
normal position or shape, substantially as, and for the purpose specified.
Dated this 4th day of February 1891.
HENRY DORSEY MENTZEL.
Haseltine. Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.