Year: 1886

page_text: Date of Application, 13th Oct., 1886.
Complete Left, 13th July, 1887.
Complete Accepted, 16th Aug., 1887.
I WILLIAM BEILBY AVERY of Digbeth, Birmingham, in the County of Warwick,
Machine Maker do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide means for checking the first rising or
falling of the weighing mechanism under the influence of the material being weighed,
and thereby prevent shocks to the mechanism, unnecessary oscillation of the beam or
levers, the undue wearing of the parts, and the premature discharge of the material
being weighed.
This momentum checking device may be adapted to all kinds of weighing machines,
but it is chiefly intended for use with automatic weighing apparatus for weighing in
bulk, and it is in connection with apparatus of this character (viz., a grain weighing
apparatus for which 1 have made application for Letters Patent No. 5931 dated
May 1st 1886) that I will now describe my improved momentum checker.
The apparatus which I place in close proximity to the weighing apparatus, consists
of a bracket standard formed with guides in which a bolt slides freely. Pivotted on
standards cast in one with the bracket, is a bell crank lever, at each extremity of which
is pivotted a trip pawle.
The bell crank lever is so arranged that one of these pawles is in the line of travel
of some one or more of the moving parts of the weighing mechanisin, or the arm of
the lever may be connected directly by a link to one of the moving parts of the
mechanism, so that the lever will be rocked on its pivot, and by means of its other
arm shoot the bolt over or under one of the moving parts. This will take effect before
any considerable momentum is attained.
A weight is connected to the bolt by a cord, which passes over a pulley mounted on
an axle carried by the bracket standard. Mounted loosely on the same axle is a spur
wheel, which gears with a pinion fitted with a flyer.-The pulley carries a ratchet
wheel on its side, and a spring pawle is attached to the spur wheel.
When the bolt is shot, as before mentioned, the weight will be drawn up, but the
moving parts, in rising, will cause the trip pawle to clear the bolt, which will then be
free, under the influence of the weight, to return to its normal position.

page_text: The ratchet and pawle arrangement permits of the sudden shooting of the bolt
without operating the spur wheel and fly pinion, but the return movement of the bolt
will be regulated and steadied by the spur wheel and flyer.
Sufficient time will thus be given for the supply, in small quantities, to the weighing
receptacle, of the grain to make up the exact weight, when the receptacle will slowly
complete its descent.
By this means all oscillation of the beam or weighing levers will be prevented, and
the speed of weighing may be greatly increased without shock on the apparatus, the
undue wearing of the parts, or the premature discharge of the material, being
weighed.

page_text: COMPLETE SPECIFICATION.
An Improved Momentum Checker for Weighing Machines.
I WILLIAM BEILBY AVERY of Digbeth, Birmingham, in the County of Warwick,
Machine Maker, 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 :-
The object of this invention is to provide means for checking the first rising or
falling of the weighing mechanism under the influence of the momentum of the
material being weighed falling into the weighing receptacle, and to thereby prevent
unnecessary oscillation of the beam or levers and the premature discharge of the
material being weighed.
This momentum checking device may be adapted to all kinds of weighing machines,
but it is chiefly intended for use with automatic weighing apparatus for weighing in
bulk, and it is in connection with apparatus of this character (viz., a grain weighing
apparatus, for which I have obtained Letters Patent No. 5931, dated 1st May 1886)
that I will now describe my improved momentum checker, reference being had to the
accompanying drawing, in which,
Fig. 1 is a side elevation of one arrangement of momentum checking apparatus.
Fig. 2 is a slightly modified arrangement of the apparatus; and
Figs. 3 and 4 are respectively an edge view and side view of certain details which
will be more particularly referred to hereafter.
The apparatus, which I place in close proximity to the weighing apparatus, consists
of a bracket standard L formed with guides in which a bolt works loosely. Pivotted
in standards cast in one with the bracket standard L, is a bell crank lever m, at each
extremity of which is pivotted a trip pawle m¹ m².
This bell crank lever is so arranged that one of these pawles is in the line of travel
of some one or more of the moving parts of the weighing mechanism, or the arm of
the bell crank lever may be connected directly by a link, or a series of links and levers,
to one of the moving parts of the mechanism, so that the lever will be rocked on
its pivot, and by means of its other arm, shoot or force the bolt over or under one of
the moving parts of the machine; thus the tail of the lever F of the weighing
apparatus is slightly prolonged, and its outer end is fitted with a roller f, which
underlies and strikes against the pawle m'. A similar roller g' is mounted on an axle
secured on one side of the rod g of the weight G. The movement of the bell crank
lever will be effected before any considerable momentum of the weighing receptacle
is attained.
A weight n is connected to the bolt / by a cord which passes over a pulley o mounted
on an axle carried by the bracket standard.-Mounted loosely on the same axle is a
spur wheel P, which gears into a pinion q fitted with a flyer q'. The pulley o carries
ratchet wheel o' on its side, and a spring pawl p' is carried by the spur wheel p (see
Figs. 3 and 4.)

page_text: The operation of the parts is as follows :—
In the normal position of the weighing, machine, the lever or arm F of the weighing
machine will lie just below the trip pawl m' of the bell crank lever m, and the
bolt will be drawn back by the weight n from its position over the roller g' on
the weight rod g.
When the grain weighing receptacle E E' makes its first descent, the lever F will
rise, and its roller f striking against the trip pawl m¹, will tip the bell crank lever m,
and cause its lower extremity to strike against a lug on the upper side of the bolt 1,
and drive it forward over the roller g' on the rod g, at the same time drawing up
the weight n. This shooting of the bolt will have the effect of arresting the rise
of the rod g, and consequently the descent of the receptacle E E¹, and will thereby
prevent the premature unlocking of the tipping bottom of the receptacle, and consequent
discharge of the grain, and also check the momentum of the descent.
The ratchet and pawl arrangement above described permits of this sudden forward
movement of the bolt without operating the spur wheel and fly pinion. The upward
movement of the lever F is so arranged that when the bolt has been shot, the bell
crank lever will free itself from the bolt, which will then be free to return to its normal
position under the influence of the weight n.-The return movement of the bolt will
be regulated and steadied by the flyer through the spur wheel and ratchet and pawl
arrangement, as will be readily understood. Sufficient time will thus be given for a
small quantity of grain to trickle through a small opening in the hopper to make up
the exact weight of grain, when the receptacle EE will slowly complete its descent,
and the tilting bottom will open and discharge the contents of the receptacle.
In the modification shown at Fig. 2, instead of a roller being provided for
striking the bell crank lever m, the upper extremity of the bell crank fever is con-
nected by a link rod f to the end of the lever I which carries the gate to shut off
the flow of grain from the hopper.
Similar letters are used to denote similar parts, and the action of the apparatus is
identical with that just described.
It will be evident that the momentum checking apparatus may be so arranged that
the bolt will be shot into a recess in the receptacle E E', or over any other convenient
part of the apparatus, and that a spring may be used in place of the weight and cord,
to return the bolt to its normal position.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, I declare that what I claim is :—
A momentum checking device for weighing machines, constructed, arranged, and
operating substantially as herein shown and described.
Dated this 13th day of July 1887
NEWTON & SON,
Agents for the Applicant.