IMPROVEMENTS IN SAFETY APPARATUS FOR HOISTS
Year: 1885

page_text: I WILLIAM NETHERWOOD, of 23 East Parade, Huddersfield, in the County of
York, Foreman Cord Cutter do hereby declare the nature of my said invention for
"IMPROVEMENTS IN SAFETY APPARATUS FOR HOISTS," to be as follows:-
This invention relates, to an improved combination of apparatus, for auto-
matically opening, and for bolting when closed, the entrance bars or doors, to the
"well
of hoists, so as to prevent accidents by ensuring the entrance being at all
times closed, except when the cage or hoist is on the floor level.
For purpose aforesaid, I employ fixed upon the side of the cage or hoist, a double
inclined or double cam surface, which as the cage ascends, or descends, one of its
surfaces, acts upon a projecting pin, of a plate; or rim bevil wheel, the teeth of
which gear with a pinion wheel, on the end of a shaft, extending across the side of
the "well" and to the outside thereof, and on the end of which shaft, is a cross
bar, at right angles to the said shaft, so that when one surface of the incline or
cam on the ascent or descent, of the cage, bears upon the pin, the plate wheel
operates the pinion and its cross shaft, and turns the bar on the end thereof, up or.
down, across and closing the entrance to the well-There is also a locking pin or
tilting catch,. which is lifted by the cage, when the latter reaches a position opposite
the entrance to the cage or hoist, and which falls (when the hoist passes) and locks
the cross bar, or gate, from the inside of the hoist.
WALTER BRIERLEY,
Town Hall Buildings, Halifax,
Agent for the Applicant.
DIEUTICATION,
Improvements in Safety Apparatus for Hoists.
"I WILLIAM NETHERWOOD, of 23 East Parade, Huddersfield, in the County of
York, do hereby declare the nature of my said invention for "IMPROVEMENTS IN
SAFETY APPARATUS FOR HOISTS" 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 an improved combination of apparatus, for auto-
matically opening, and for bolting when closed, the entrance bars or doors, to the
Improvements in Safety Apparatus for Hoists.
I WILLIAM NETHERWOOD, of 23 East Parade, Huddersfield, in the County of
York, do hereby declare the nature of my said invention for "IMPROVEMENTS IN
SAFETY APPARATUS FOR HOISTS" 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 an improved combination of apparatus, for auto-
matically opening, and for bolting when closed, the entrance bars or doors, to the

page_text: "well" of hoists, so as to prevent accidents by ensuring the entrance being at all
times closed, except when the cage or hoist is on the floor level.
Such being the nature and object of my said invention, the following is a
complete description of same, reference being had to the accompanying drawings
forming a part of this specification in which:-
Figs. 1 and 1ª shect 1 are detail views of my improved apparatus.
Fig. 2 is an outside elevation shewing part of hoist or well.
Fig. 3 is a front view of well shewing cross bars raised.
Fig. 4 is a like view bars being down or across the entrance to the hoist or well.
At 1 is a double incline fixed to the side of the cage or hoist and which as the
cage ascends or descends one of its inclined surfaces acts or bears upon a projecting
pin 2 of the plate or rim bevel segment wheel 3, the teeth of which gear with the
pinion wheel 4 loose on the cross shaft 5 which turns the boss 6 through the
pinion 4 and torsion spring 11, and extending across the side of the well 7 is
the cross bar S at right angles to the said shaft so that when one surface of the
incline or cam 1 on the ascent or descent of the cage 9 bears upon the pin 2 the plate
wheel 3 operates the pinion 4 and its shaft and turns the bar 8 up or down across
and closing the entrance to the well 7-It is obvious that the source of partial
rotation of the segment wheel 3 through contact of the cam surface 1 may be
obtained through the cam surface 1 acting upon the pin 2 if placed in an arm such
as 3 (Fig. 2) which gives precisely the same partial rotation to the boss 6 see
sheet 2.
The spiral spring 11 is placed upon and its end attached to the shaft 5 and to
pinion 4 or lever 3 so as to act as a torsion spring and prevent breakage of the
teeth of the wheels or lever 3 by reason of the great leverage power should any one
improperly pull at the ends 8 of the cross bar or bars 8 when in the raised position
shewn at Figs. 4 and 5-The spring 12 is a counterbalance to upper arm 8.
For greater security against accident more than one of the cross bars 8 may be
used as for example in the drawings two of such bars are shewn, being connected
to each other by means of the link 10 so that as the lower bar 8 is raised, the upper
one is by the link 10 operated in like mannei.
Having now particularly described, and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The combination of the double inclined cam surface attached to and travelling
with the cage and for operating the wheel 3 or its equivalent arm 3 whereby the
cross bar or bars 8 are raised and lowered as and for purpose described.
WILLIAM NETHERWOOD.
By his Agent, Walter Brierley,
Town Hall Buildings, Halifax.