Improvements in and relating to Epicyclic Differential Gearing.
Year: 1895

page_text: Date of Application, 2nd Dec., 1895
Complete Specification Left, 2nd Oct., 1896-Accepted, 2nd Feb., 1997
PROVISIONAL SPECIFICATION.
Improvements in and relating to Epicyclic Differential Gearing.
I, LEOPOLD ROTSCHILD of 40 kulso váciút Budapest in the Kingdom of
Hungary, do hereby declare the nature of this invention to be as follows:-
My invention relates to an epicyclic differential gearing which is adapted to be
adjusted to a maximum driving-power so that when the power to be transmitted or
the resistance to be overcome exceeds a certain limit the gearing will not transfer
the same, but a secondary movement will take place this movement being used for
signalling or for regulating the principal mechanism, for instance for throwing the
driving mechanism out of action.
This improved differential gearing comprises substantially an interiorly toothed
wheel and an exteriorly toothed planet-wheel, the latter being provided with an
arm which owing to a direct or indirect load is compelled by an external power,
such as for instance a weight, spring, frictional resistance, hydraulic pressure, the
attraction of magnets to make a movement exactly or approximately parallel to
itself, as long as the driving power or the resistance does not exceed the limit
depending on the aforesaid load, but should this limit be passed the arm herein-
before mentioned will make a movement dependent on that of the said planet-
wheel inside the interiorly toothed wheel, instead of a parallel movement.
The gearing constructed and operating in this manner is capable of various
modifications and applications which will be set forth in the Complete
Specification.
Dated this 2nd day of December 1805
S. S. BROMHEAD,
97 Newgate Street, E.C., Agent for Applicant.
Improvements in and relating to Epicyclic Differential Gearing.
I, LEOPOLD ROTSCHILD of 40 külso-váciút, Budapesth, in the Kingdom of
Hungary, Engineer, 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 :-
This invention relates to a differential gearing which is capable of being
adjusted for a maximum driving force in such a manner that on the force to be
transmitted or the resistance to be overcome exceeding a certain limit such force
or resistance is no longer transmitted by the gear, but a secondary motion is
produced which is employed for signalling purposes or for arresting the main
motion, such for example for throwing the driving mechanism out of operation.
Figures 1 to 5 illustrate various arrangements of the gear, whilst, Figure 6
illustrates one method of applying the gear for example to a gang saw.
.

page_text: :
The arrangement shown in Figures 1 and 2 consists essentially of a toothed
wheel F with internal teeth, and of a planet wheel C which engages with the teeth
of the toothed wheel F and is mounted on an eccentric on the shaft A. The
shaft A is continuously driven, for example by means of a ratchet wheel D and
of a pawl E. In consequence of the wheel C being carried round the shaft A by
the eccentric, and of its teeth engaging with those of the wheel F, the former
has a tendency to roll in the outer toothed wheel F. But as in consequence of
the arrangement hereinafter described, the toothed wheel C can only move
parallel to itself, and therefore each point of the wheel describes the same circle,
the toothed wheel F is compelled to rotate. This rotation may be transmitted on
as a main motion. The arrangement for guiding the planet wheel C in a parallel
manner consists of an arm G, which is either cast in one with the nave of the
planet wheel, or is keyed by means of a ring B upon the nave, and is loaded
with a weight Q.
The arm G bears upon the pin H of a lever K, that is pivotted on the pin I
and is supported by an eccentric L. In consequence of the eccentric L keeping
the lever K in oscillatory motion, that part of the lever which is supported by the
pin His moved up and down, with the result that the arm G and with it the
planet wheel is guided in a parallel manner. This parallel guidance is not
however au absolutely constrained guidance, because as soon as the resistance
exceeds a certain limit, that is to say, the outer wheel F has to overcome in
its rotation a greater moment of force than is represented by the weight
the shaft A, the wheel F is not rotated any longer, but the arm G is raised
together with the weight Q.
about
The main movement, that is to say, the rotation of the wheel F is therefore
arrested, and there is produced a secondary motion, i.e., the motion of the arm G,
which may then be utilized for signalling purposes, or for throwing the driving
mechanism out of operation in any desired manner.
In the arrangement shewn in Figure 3, the arm G is not pressed directly by
a weight but is pressed by means of a two armed lever 0 (which is pivotted on a
pin N and is loaded with a weight Q') against the pulley H.
Figure 4 illustrates a modification in which parallel motion is produced by the
provision of a forked shoulder or projection P carried by the planet wheel C.
Between the forks of this projection there extends the pin or pivot of a lever R
that is loaded with a weight Q³, and is actuated by means of an eccentric.
The modification illustrated by Figure 5 differs from that shown in Figures 1
and 2 in that in this case, instead of the pin H, an eccentric V on the shaft T is
employed, which latter is rotated from the shaft A by means of strap or chain
gear SZU.
Further modifications are shewn in Figure 6, in which the different modes of
employing the gear are illustrated by way of example in its application to a
gang saw.
But
The device A' in Figure 6 serves for moving forward the log F¹ and if the
resistance should exceed a certain limit, the device serves also for braking the
driving wheel B₁ and for throwing the driving mechanism out of operation. This
may be effected by keeping the brake C¹ away from the driving wheel B' by the
arm b by means of the arrangement of levers 12 fd d³ d² d¹ and of the pin c.
as soon as the arm bis raised in consequence of an increase in the resistance the
arm & releases the pin c, and the brake C' is pressed by the weight Q³ against the
driving wheel B¹. At the same time the lever g serves by means of disengaging
devices to shift the belt (Figure 7).
The arrangement which has been employed in this case is constructed as
follows:-
-
In front of the toothed wheels F and C there is arranged the guide piece P and
behind them is the lever b. The guide piece P is placed with its rectangular
opening over an eccentric, and as it bears against the fixed pin p it réceives only a
vertical up and down motion from the eccentric. The guide piece P serves to

page_text: guide the planet wheel C in a parallel manner, by means of a pin in the wheel C
taking into the slot på of the guide piece. The lever b arranged behind the toothed
wheels is connected by means of two pins with the guide piece, said pins taking
into the vertical slots pl p³ of the guide piece. By means of this connection the
guide piece can move up and down without moving the lever b from its position of
rest. Only when the further progress of the log F meets with a great resistance
by reason of any obstacle then instead of the outer wheel F, the inner wheel C is.
rotated, which then rotates the guide piece P and with it the lever b in the direction
of the arrow, thereby producing a braking action and throwing the mechanism out
of operation.
The devices E' and D¹ in Figure 6 have for object to press down the log F..
The mechanisms which are here employed differ from those shown in Figures 1
and 2, in that the eccentric strap L is formed with two arms G H and IK
arranged at right angles to one another, one of which (H or K) is guided on a
fixed pin, whilst the other is either loaded by a weight Q or is pressed upwards.
by a weight Q by means of a chain. When it is desired to let the roller M down
upon the log, the shaft of the gear is rotated to the right hand by means of a hand
wheel provided thereon, so that the arm H bears upon the fixed pin and the outer
wheel is caused to rotate. With this wheel there is connected a toothed wheel N
which engages in the rack O and by means of the latter presses down the roller M.
When the roller reaches the log, the resistance becomes very great; the planet
wheel and the arms Hand G are rotated so that the arm H moves away from the fixed
pin. By this means the roller M has a certain amount of play, that is to say,
when the log F¹ becomes thinner, the roller can be pressed down by the weight Q³.
But when the log moves out away from the roller, the latter can only move down
to the extent allowed until the arm H strikes the fixed pin.
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 [
claim is :-
A differential gear capable of adjustment for a maximum force, characterized
by an internally toothed wheel F and a planet wheel C, which latter carries an
arm G adapted by being weighted to carry the planet wheel C with it in a parallel
manner until the driving force or the resistance exceeds a certain limit, when the
parallel motion is converted into a rolling motion, as set forth.
Dated this 2nd day of October 1906
Dated this 2nd dor of October 1906.
d day of On
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.