IMPROVEMENTS IN GRAVITY FRICTION RATCHETS to be as follows:
Year: 1884

page_text: I ANSON DAKIN SIMPSON of Niverville, Columbia County in the State of
New York, United States of America, Merchant, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN GRAVITY FRICTION RATCHETS to be
as follows:-
"
A circular plate or disc is provided with a triangular-shaped hub formed of three
eccentric arcs and three tangents, the tangents meeting the arcs at the centres of
the sides of the triangle, the arcs having their centres on a line drawn from the
centre of the sides of the triangular hub to the points of the same. The hub is
thus provided with three equally-divided shoulders, and three equally-divided
points of pressure. Three segments are placed against the hub, the inner edges of
the segments being straight and resting against the shoulders of the hub, and
coming in contact with the eccentric where the tangent meets the arc, and the
outer edges curved in such a manner that the said outer edges form a complete
broken circle when the inner edges of the said segments rest against the shoulders
of the hub.
A cap fits snugly over the outer edges of the segments. The circular plate or
disc, or the cap may be provided with cogs, or with a groove for a belt or cord, or
with any suitable means for transmitting power. If the cap placed over the
segments is revolved in the proper direction, the outer edges of the segments will
bind against the rim of the cap, and the inner edges of the said segments will come
in contact with the eccentrics of the hub as the gravity of the said segments causes
them to come in close contact with the hub and cap, and the friction of the cap
against the segments causes them to bind against the eccentrics of the hub, binding
the cap and hub together. If the cap is revolved in the other direction the
segments will not bind, and the cap will slide over them because the points of the
eccentric hub bb' 6 hold the segments from partaking of the motion of the cap.
The cap is held firmly on the shaft and the disc is mounted loosely on the shaft, or
the disc may be held firmly on the shaft and the cap may be mounted loosely, and
the motion transmitted from the cap or disc, as desired; or the cap and the disc
can be mounted on separate shafts, if desired, or in any other suitable manner.
CD .

page_text: The same idea can be carried out by using a double eccentric hub and two segments,
the principle being the same.
Springs are interposed between the points of the segments and the shoulders of
the hub for the purpose of taking up the wear.
In the accompanying drawing Figure 1 is a face view of the disc and-hub with
the segments resting against the tangents of the hub, and Figure 2 is a sectional
view on the line xx Figure 1.
A is the disc, B is the hub and E is the cap.
hub, a a¹ a are the points of pressure and 8 8 8
66' 6' are the shoulders of the
are the segments.
T. N. PALMER & Co.,
For the Applicant.

page_text: the segments resting against the tangents of the hub.
Figure 2 is an inside face view of the cap.
Figure 3 is a sectional view of the ratchet on the line xx, figure 1.
Figure 4 is a face view of one of the segments.
Figure 5 shows another form of my invention.
Like letters indicate like parts in all the figures.
A circular plate or disc A is provided with a triangular-shaped hub B formed of
three eccentric arcs and three tangents, the tangents meeting the arcs at the centres
of the sides of the triangle, the arcs having their centres on a line drawn from the
centre of the sides of the triangular hub to the points of the same. The hub is thus
provided with three equally divided shoulders b, 61, 62, and three equally divided
points of pressure a, a¹, a².. Three segments S, S¹, S³, are placed against the hub B
the inner edges of the segments being straight and resting against the shoulders of
the hub and coming in contact with the eccentric where the tangent meets the arc,
and the outer edges curved in such a manner that the said outer edges form a
complete broken circle when the inner edges of the said segments rest against the
shoulders of the hub.
A cap E fits snugly over the outer edges of the segments S, S¹, S. The circular
plate or disc A or the cap E may be provided with cogs or with a groove for a belt
or cord, or with any suitable means for transmitting power. If the cap E, placed
over the segments S, S¹, S', is revolved in the direction of the arrows, figure 1, the
outer edges of the segments S, S¹, S, will bind against the rim of the cap E and
the inner edges of the said segments will come in contact with the eccentrics of the
hub as the gravity of the said segments S, S¹, S2 causes them to come in close
contact with the hub B and cap E and the friction of the cap E against the
segments S, S¹, S' causes them to bind against the eccentrics of the hub B binding
the cap E and hub B together. If the cap E is revolved in the inverse direction of
the arrows the segments S, S¹ S* will not bind and the cap E will slide over them
because the points of the eccentric hub b, b' 6 hold the segments from binding or
partaking of the motion of the cap. The cap is held firmly on the shaft and the
disc A is mounted loosely on the shaft or the disc A may be held firmly on the
shaft and the cap E may be mounted loosely and the motion transmitted from
the cap or disc as desired; or the cap and the diso can be mounted on separato
shafts, if desired, or in any other suitable manner,

page_text: Springs c are interposed between the points of the segments and the shoulders
of the hub for the purpose of taking up the wear.
Instead of a triangular-shaped hub and three segments I may use a double
eccentric hub formed of two eccentric arcs and two tangents (as shown in Figure 5)
with two segments S, S¹ (the cap E fitting over them as before described) but by
using three segments there is no time when gravity is not acting upon one of the
segments and causing it to bind, thereby taking up all lost motion; also, there
being three points of pressure against the cap instead of two, and three segments
instead of two, it distributes the pressure more equally around the rim of the cap
thereby adding to its strength.
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
First. A friction ratchet made substantially as herein-before described, and
consisting of a disc or plate provided with a triangularly-shaped hub formed of
three eccentric arcs and three tangents, the tangents meeting the arcs at the centres
of the sides of the triangle, the three segments with straight sides resting against
the hub and coming in contact with the eccentrics of the bub where the tangents
meet the arc, and the cap fitting over them, for the purpose described.
Second. A friction ratchet made substantially as herein described and shown
in figure 5, consisting of a disc or plate provided with a double eccentric bub
formed of two eccentric arcs and two tangents, the two segments with straight
sides resting against the hub, and the cap fitting over them for the purpose
described.