Improvements in Stop or Overwinding Motions for Hay and Straw Elevators.
Year: 1894

page_text: Date of Application, 9th July, 1894
Complete Specification, Left, 5th Apr., 1895-Accepted, 11th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in Stop or Overwinding Motions for Hay and Straw
Elevators.
TOM WARD Cook Engineer and Implement Manufacturer' Yaxley Peterboro'.
I do hereby declare the nature of this invention to be as follows:-
A screwed spindle (called the first motion spindle) is contained in a tubular
casting & fixed in the usual manner to an elevator. The spindle is screw cut the
entire length within the tubular casting. The spindle when turned for either
closing or open motion of the elevator, carries from one end to the other. a nut to
which nut is attached an elongated base this base during its course is guided in a
slot or opening at the under. or either sides of the casting. The aforesaid tubular
casting is diametrically enlarged at both ends, within, these enlargements is a hinged
catch (or pawl) & the elongated base of the nut is brought into contact with this
hinged catch below the centre of motion thus securing a stop motion for opening
and closing the elevator for as each hinged catch or pawl is acted upon by either
way motion it comes in contact with a ratchet catch such, ratchet is a fixture to
and moves with the spindle, the ratchet catches and the ends of the hinged pawls
are splayed or bevilled giving instant relief when a contrary motion is put in
force, this relieving is further assisted by a spiral spring attached to end of each
pawl.
To prevent overwinding when raising the elevator a quadrant is attached to the
casting which carries the driving spindle a connecting rod is attached to the said
quadrant at one end and when the trough is carried to its safest height, the end of
quadraut slot acts upon the end of connecting rod, by means of the connecting pin
so that the other end. of rod attached to a double centre pawl immediately places
the pawl into a ratchet catch. such catch is upon the edge of the first motion
ratchet.
Dated this 7th of July 1801
COMPLETE SPECIFICATION.
Improvements in Stop or Overwinding Motions for Hay and-Straw
Elevators.
"
I, TOM WARD COOK, of Yaxley near Peterborough, in the County of
Huntingdon, 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 improved stop motions and hay and straw elevators,
and it has for its object preventing the overwinding of the gear by which the
elevator is unfolded and raised into its highest position for working and lowered
and refolded again.

page_text: In the accompanying drawing which illustrates my invention;
Figure 1 is a broken view in side elevation of part of an elevator showing my
improved stop motions.
Figure 2 is a view in longitudinal section-on an enlarged scale of the stop
motion for preventing overwinding when folding and unfolding the elevator, and
Figure 3 is a view in transverse section thereof showing one of the clutches.
Figure 4 is a broken view showing a modification of the stop motion for
preventing overwinding when raising the elevator into its highest working
position.
Throughout the views similar parts are marked with like letters of reference.
The first motion shaft A which carries the usual worm-wheel of the actuating
gear has formed on or fixed to it at about the centre of its length a screw thread a
on which is mounted a travelling nut B. Encircling the first motion shaft A is a
case C having enlarged ends c, c, which are provided with suitable lugs or their
equivalent adapting the said case to be fixed to the frame of the elevator. The
travelling nut B is prevented from rotating in the case C by any known device, a
convenient one being that shown by Figure 2, which consists of a stud or
projection 6 fixed to the nut B and adapted to travel in a slot C¹ in the case C.
On the first motion shaft A are fixed two discs D, D, in close proximity to the
enlarged ends c, c, of the case C. In each of the enlarged ends c of the case C is
pivotted a pawl E adapted to engage with a ratchet on the adjacent disc D.
The pawls E, E, when in their normal position hang clear of the teeth or
serrations d by their own weight.
When the first motion shaft A is operated to fold or unfold the elevator, the
nut B travels along the said shaft and at the proper time-determined by the pitch
of the screw-pushes one or other of the pawls E into contact with one of the
discs D, thus locking the shaft to the case and preventing its further motion in the
direction in which it has been rotated.
I do not limit myself to any particular form for the engaging parts of the pawl
and ratchet, but I prefer that they should be splayed or bevelled so as to disengage
simultaneously when the shaft is rotated in the opposite direction to that which
causes their engagement, and if necessary a suitable spring may be employed for
assisting in their release.
To prevent overwinding when raising the elevator to its highest working
position, a quadrant F is formed on or attached to the bracket carrying the trough
which has for its axis the driving spindle bracket. In this quadrant is cut or
formed a slot with which engages a pin g carried by a rod G which at its other
end is attached to a lever or pawl H fulcrated to the frame of the machine. This
lever or pawl H is adapted to engage when it is pushed over by means of the
quadrant F acting through the ping and rod G-with a ratchet d¹ formed in or on
the adjacent disc D on the first motion shaft A.
As a modification, the rod G may be mounted to slide in a suitable bearing,
carried by the frame of the machine and to be moved longitudinally to force the
lever or pawl H into contact with the ratchet d' in or on the disc D by means of a
lever or arm F keyed to the bracket of the driving spindle Y as shown by
Figure 4.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein before described and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
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:-
(1.) The improved stop or overwinding motions for hay and straw elevators
substantially as herein before described and illustrated by the accompanying

page_text: (2.) A stop or overwinding motion for hay and straw elevators, consisting
essentially of a screw thread on the first motion shaft, of a travelling nut mounted
thereon, of a case fixed to the frame of the machine and enclosing the first motion
axle, of two ratchet discs fixed to the said axle, and of pawls adapted to be
actuated by the travelling nut to engage with the ratchet discs, as set forth.
(3.) A stop or overwinding motion for hay and straw elevators, consisting
essentially of a slotted quadrant or its equivalent fixed to the trough bracket, of a
rod adapted to be actuated by the said quadrant or its equivalent, of a pivotted
pawl adapted to engage with a ratchet in or on a disc on the first motion shaft
and to be operated by the rod actuated by the quadrant or its equivalent, as set
forth.
(4.) In a hay or straw elevator, the combination of the stop or overwinding
motions claimed by the preceding two claims, as and for the purpose set forth.
D1 1: 5th 1
A 1905
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.