Improvements in Cam Driving Mechanism.
Year: 1896

page_text: Date of Application, 24th Feb., 1896
Complete Specification Left. 24th Dec.. 1896-Accepted. 24th Feb., 1397
Date of Application, 24th Feb., 1896
Complete Specification Left. 24th Dec.. 1896-Accepted. 24th Feb., 1397
PROVISIONAL SPECIFICATION.
Improvements in Cam Driving Mechanism.
We, THOMAS HANN, Mechanical Engineer, WILLIAM BROMLEY, Wine and
Spirit Merchant's Traveller, JOHN PRICE, Mechanical Engineer, all of 18 Upper
Kennington Lane, ALFRED HENRY SMITH, Gentleman of 89 Marney Road,
Clapham Common, and DICK EDWARDS RADCLYFFE, Gentleman of 56 Gloucester
Crescent, Regent's Park, all in the County of London, do hereby declare the nature
of this invention to be as follows:-
This invention refers to driving mechanism involving the employment of a
multiple throw cam or cams, connecting rods and cranks, all as hereafter described,
whereby the rotary motion of a first motion shaft, or driving shaft, is communicated
to a shaft to be driven, in such manner that the latter driven shaft is revolved at
an increased speed, relatively to the driving shaft, and this without the employment
of chain, or toothed wheel connections as is now common. Such mechanism is, or
may be, advantageously used in machinery generally, such as for lawn mowers, and
other agricultural implements, for fans, blowers, centrifugal pumps, locomotives,
marine, launch, or other engines, and for machinery in general where a driven shaft
is to be revolved, at an increased speed, relatively to the driving shaft.
With this object in view, and according to one arrangement of our invention,
we rigidly mount upon the first motion shaft, or upon the driving shaft, two multiple
throw cams, which may be grooved, or peripheral cams. Each cam acts upon a
connecting rod, each of which latter is provided with a bowl or bearing end, on
which the cam acts, and each connecting rod at or near the bowl end, is carried by
a link, pivotted to the connecting rod at one end and freely swinging from a
suspending pivot attached to a fixed part of the framework, at its other end.
The driven shaft is provided with cranks, outo which the opposite ends of the
connecting rods take, whereby, supposing that the cams are of three-throw character,
the driven shaft will be revolved three times during one revolution of the driving
shaft. Those parts of the connecting rods near the cams, may be carried by links,
pivotted above or below the cams, or in some cases instead of links, fixed guides
may be employed, so constructed as to allow for the rocking, and endway motions,
of the connecting rods. Where two cams are employed the latter should be set at
properly differing angles.
It will be understood that the cam groove, or surface, say in a three throw cam
approaches the centre at three points and is most distant therefrom at three points,
the curve varying according to the length of the cranks upon the driven shaft, and
it will be obvious that such cams can be formed to communicate any desired number
of impulses to the driven shaft or other part.
Vibrating motion of rapid character may be readily communicated by the same
or similar mechanism, by varying the throw of the cam grooves, or by varying
the length of the cranks on the driven shaft or rocking part.
In some cases and especially where the speed of the driven part is required to
bear an unequal or fractional proportion to the speed of the driving shaft we may
cause the connecting rods to directly rotate a toothed wheel gearing with a toothed
wheel on the driven shaft, the gear wheels bearing the required proportion to each
Lother

page_text: By our invention the speeding mechanism between two parts in machinery, is
among other advantages, simplified, such construction is easily adjusted and
readily manufactured, and moreover is especially advantageous, where more delicate
connections, such as chain or toothed gearing, would be subject to becoming choked
by dust, atmospheric influences, and the like.
Dated this 24th day of Fab 18OG
BREWER & SON,
London and Leeds, Agents for the Applicants.
Improvements in Cam Driving Mechanism.
We, THOMAS HANN, Mechanical Engineer, WILLIAM BROMLEY, Wine and
Spirit Merchant's Traveller, JOHN PRICE, Mechanical Engineer, all of 18 Upper
Kennington Lane, ALFRED HENRY SMITH Gentleman of 89 Marney Road,
Clapham Common, and DICK EDWARDS RADCLYFFE Gentleman of 56 Gloucester
Crescent Regent's Park, all in the County of London, 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 refers to driving mechanism, involving the employment of a
multiple throw cam, or carns, connecting rods, and cranks, all as hereafter
described, whereby the rotary motion of a first motion shaft, or driving shaft,
is communicated to a shaft to be driven, in such manner that the latter driven shaft
is revolved at an increased speed, relatively to the driving shaft, and this without
the employment of chain, or toothed wheel connections.
Such mechanisin is, or may be, advantageously used in machinery such as mowing
machines and other agricultural implements, fans, blowers, centrifugal pumps,
locomotives, marine, launch or other engines, where a driven shaft is to be revolved,
at an increased speed, relatively to the driving shaft.
In the accompanying sheet of drawings we have illustrated diagrammatically,
the application in some leading cases of our cam driving mechanism, and from
which the various applications to machinery hereinbefore mentioned can be readily
understood.
According to one arrangement of our invention, and as illustrated at Fig. 1 in
side elevation and at Fig. 2 in end elevation an arrangement is shewn whereby a
driven shaft may be revolved at an increased speed, relatively to the driving shaft
and such an arrangement is applicable to drive say the rotary cutter of a mowing
machine or to other analogous uses such as road brushes. Mounted rigidly upon
the first motion or driving shalt A, are two multiple throw catus B, such cams as are
or may be cut by machinery described and illustrated in British Specification accom-
ranying an application No. 7517 dated 9th April 1896. These cams may be grooved
as shewn or they may be peripheral driving cams. Each cam B acts upon bowls or
rollers c (shewn at Fig. 4 hereafter referred to) which take into the grooves C and
are carried by connecting rods DD; these connecting rods are carried by links E E
the ends of which are connected to the bowl or roller ends of the connecting
rods D D whilst the opposite ends of the links are carried upon a shaft e
and are free to oscillate thereon. The connecting rods D D are coupled to
cranks or eccentrics of the driven shaft F; all the above shafts are carried in
suitable bearings.
Thus it will be seen that upon the revolution of the driving shaft A, the cam
grooves C will cause the bowls c to be drawn to, or forced away from the centre
of the shaft A, thereby causing the connecting rods D D to be operated a number

page_text: of times, corresponding to the number of ontward and inward curves of the cam,
and in this manuer the shaft F may be driven at an increased speed as before
stated.
At Figs. 3 and 4 is illustrated an arrangement whereby, in such a mechanism
as shewn at Figs. I and 2, the bowl end of the counecting rods D may be carried
by fixed guides, so constructed and arranged as to allow for the rocking and endway
motions of the connecting rods. Fig. 3 is an end view and Fig. 4 is an enlarged
sectional plan view taken about the line X Y of Fig. 3. E' is a fixed bracket
having a vertical groove therein, which latter receives a similar bowl to that which
travels in the cam groove; both bowls c c are carried upon a pin d secured in
position in the head of the connecting rods D, best seen at Fig. 4.
the connecting rod D is free to oscillate whilst being driven in the vertical
direction.
Thus
In cases where several cams are employed the latter should be set if necessary at
differing radial angles, as arranged at Figs. 1 and 2.
It will be understood that the cam groove, or surface, say in a three throw
cam approaches the centre at three points and is most distant therefrom at
three points, the curve varying according to the length of the cranks to be
employed upon the driven shaft, and it will be obvious that such cams can be
forined to communicate any desired number of impulses to the driven shaft or other
part.
Reciprocating motion may be readily communicated to apparatus such as the
piston rod of a pump as illustrated at Fig. 5. A is the driving shaft carried
in suitable bearings, B is the grooved cam mounted upon the shaft A, G is a piston
rod having a longitudinal slot H formed thereon at its upper end, this latter slot H
embraces a collar upon the shaft A and is retained in position by such collar or
flange H¹ secured to the shaft A.
Upon the piston rod G is secured the pin d on which is mounted a bowl
engaging with the groove C of the cam B. The piston rod is guided at its lower
end say by the gland of a pump cylinder J and the piston of the said pump would
also assist in guiding same. In this manner the piston rod is only capable
of receiving a reciprocating motion which it does, upon the revolution of the
cam B, the number of reciprocations depending upon the throws of the cam as
before stated.
Where rapid reciprocations are required in machinery our mechanism is
particularly adapted, as for instance in imparting motion to the knives of mowing
machines, as is indicated at Fig. 6 of the drawings. In this case the arrange-
ment of guides and parts is substantially the same as at Fig. 5 and it is therefore
unnecessary to repeat the description, suffice it to say that the knives L and the
shaft A are stationary in position and the knives K are reciprocated laterally
at a rapid speed, which speed is of course regulated by the revolutions of the shaft A
which may receive its motion by any suitable mechanism such as bevil gear driven
from the rotating axle of the mowing machine.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what we
claim as our improvements in cam mechanism for driving machinery such as mowing
machines and other agricultural implements, fans, blowers, centrifugal pumps,
locomotives, marine, launch and other engines are as follows:-
1. The mechanism essentially composed of a multiple throw cam or cams carried
upon a driving shaft, a connecting rod or rods having each at one end a bowl
engaging with the cam groove and at the other end connected to a crank or equivalent
on a driven shaft, a radially oscillating guide or guides for the connecting rod or
rods and parts connected therewith arranged and acting substantially as described
with reference to Figs. 1 and 2 of the drawings.
2. The mechanism essentially composed of a multiple throw cam or cams carried
upon a driving shaft, a connecting rod or rods having each at one end a bowl

page_text: -engaging with the cam groove or cam grooves, and at the other end or ends
connected to a crank or cranks or equivalent on a driven shaft, a stationary guide
or guides for the connecting rod or rods arranged and acting substantially as
described with reference to Figs. 3 and 4 of the drawings.
'
3. The mechanism essentially composed of a multiple throw cam carried upon
a driving shaft, a rod having at one end a slot or guide and a bowl engaging
with the cam groove while the opposite end is connected to a part to be recipro-
cated, substantially as illustrated and described with reference to Figs. 5 and 6
of the drawings.
Dated this 24th day of December 1896
BREWER & SON,
Loudon and Leeds, Agents for the Applicants.