Improvements in Elevators for Hay, Straw, and the like.
Year: 1897

page_text: Date of Application, 26th Apr., 1897
Complete Specification Left, 18th Jan., 1898-Accepted, 12th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in Elevators for Hay, Straw, and the like.
I, HENRY REEVES, of Bratton Iron Works, Westbury, in the County of Wilts,
do hereby declare the nature of this invention to be as follows:-
:-
This invention relates to stop mechanisms whereby overwinding is prevented.
A ratchet wheel is fixed to the first motion shaft and a double pawl similar to
a clock escapement engages with it. The pawls are operated by a rod pivotted to
them and suspended by a link from a lever pivotted to the frame of the machine.
The wheel of the raising arm carries three stops which engage with the end of
the connecting rod as hereinafter described and by pushing or pulling it causes one
or other of the pawls to engage at certain times with the ratchet wheel and so pre-
vent the continued rotation in the same direction of the first motion shaft.
If the lower half of the elevator trough is lowered (whether upper half is
folded onto it or not) it rests upon the lever holding it in an approximately
horizontal position thus lifting the connecting rod clear of the path of one of
the stops and bringing it into the paths of the other two. When the wheel of the
raising arm is turned in one direction sufficiently to bring the upper half of the
trough into a line with the lower half one of these stops comes against the end of
the connecting rod and pushing it throws one of the pawls into gear.
When the wheel is turned in the other direction sufficiently to fold together
the two halves of the trough the other stop comes against the end of the connect-
ing rod and pulling it throws the other pawl into gear.
On the other hand when the trough is raised as a whole its lower half no longer
rests on the lever which is tilted by the weight of the link and connecting rod so
that the end of the latter is depressed below the paths of two of the stops and
into the path of the third so that when the wheel has been turned sufficiently to fully
raise cue trough this stop comes against the end of the rod and pushes it so pull-
ing the pawl into gear.
Tad this 04th day of Amil 1907
Improvements in Elevators for Hay, Straw, and the like.
I, HENRY REEVES, of Bratton Iron Works, Westbury, in the County of Wilts,
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 follow-
ing statement:-
This invention relates to stop mechanisms whereby overwinding is prevented.
Figure 1 is a side elevation of the elevator raised to its full height.
Figure 2 is a side elevation showing the position of the parts when the two
halves ab of the elevator trough (Figure 1) are folded together.

page_text: Figure 3 is a side elevation showing the position of the parts when the elevator
is lowered ready for folding the two halves a b of the trough together. Figure 4
is a plan of Figure 1.
Figures 2, 3 and 4 are to a larger scale than Figure 1 and in them many of the
parts are omitted.
a is the lower half of the trough pivotted at a¹ to the carriage-b is the upper
half of the trough hinged at 61 to the end of a-c is the raising arm and d is its
wheel-e is the first motion shaft to which a bevel pinion e¹ is fixed. is a bevel
wheel on the shaft f and gearing with the pinion e¹. f is a worm on the shaft f
and gearing with the worm wheel g¹ on the shaft g. 92 are pinions on the shaft
gearing with rings of teeth d¹ on the wheels d. All this is an ordinary construc-
tion and forms no part of the present invention.
e is a ratchet wheel fixed to the first motion shaft and a double pawl h h¹
similar to a clock escapement engages with it. The pawls h h are operated by
a rod j pivotted to them and suspended by a link k from a lever / pivotted at 11
to the frame of the machine. The wheel d of the raising arm carries three
stops mm² m² which engage with the end of the connecting rod ; as hereinafter
described and by pushing or pulling it cause one or other of the pawls h h to
engage at certain times with the ratchet wheel e² and so prevent the continued
rotation in the same direction of the first motion shaft.
If the lower half a of the elevator trough is lowered (whether upper half 6 is
folded onto it or not) it rests upon the lever l holding it in an approximately
horizontal position as shown in Figures 2 and 3 thus lifting the connecting rod j
clear of the path of the stop m and bringing it into the paths of the other two m² m².
When the wheel d of the raising arm is turned in one direction as shown in
Figure 3 sufficiently to bring the upper half 6 of the trough into a line with the
lower half a the stop m¹ comes against the end of the connecting rod ; and push-
ing it throws the pawl h into gear.
When the wheel d is turned in the other direction sufficiently to fold together
the two halves a and b of the trough as shown in Figure 2 the other stop m² comes
against the end of the connecting rod ; and pulling it throws the other pawl h¹
into gear.
On the other hand when the trough is raised as a whole its lower half a no
longer rests on the lever which is tilted by the weight of the link k and con-
necting rod as shown in Figure 1 so that the end of the latter is depressed
below the paths of the stops m¹ m² and into the path of the third stop m so that
when the wheel has been turned sufficiently to fully raise the trough as shown
in Figure 1 this stop m comes against the end of the rod j so pulling the pawl h¹
into gear.
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 I
claim is:-
1. The combination of a ratchet wheel on the first motion shaft and a pawl
operated by a stop on the wheel of the raising arm substantially as described.
2. The combination of a ratchet wheel on the first motion shaft and a double
pawl operated by stops on the wheel of the raising arm substantially as described.
3. Stop mechanism for elevators substantially as described and shown in the
drawings.
Dated this 14th day of January 1808