Improvements in Safety Appliances for Hoists.
Year: 1896

page_text: Date of Application, 22nd Jan., 1896
Complete Specification Left, 22nd Oct., 1896-Accepted, 5th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in Safety Appliances for Hoists.
We, ALBERT HUGH LLOYD, of 60 Dale Street, in the City of Manchester,
Manufacturer, and CHARLES HOPKINSON, of 29 Princess Street, in the City of
Manchester, Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
Our improvements are primarily intended to prevent the doors of hoist well holes
being left open when the hoist has moved away and consists of arrangements by
which the hoist door when opened locks the cage of the hoist so that the hoist cage
cannot move up or down until the door has been closed. In some cases instead of
preventing the movement of the cage we may make the cage as it moves away
automatically close the door.
Our invention is applicable to swing doors in one or two leaves and the door is
pivoted as near as possible to the edge of the hoist well; to the top and bottom of
the door (or either one of them as required) are attached a rigid arm or arms which
do not impede the path of the cage when the .door is closed but when the door is
opened to an extent determined by the shape of the arm, the path of the cage is
obstructed against motion either up or down, or both, past the open door. The rigid
arms may be cranked or bent so as to lie in the clearance of the well hole and the
obstructing portion allows a sufficient clearance for variations of level in stopping the
hoist. We extend the doors so as to close on the reverse side of the jamb instead of
in the ordinary rebate on the front side but in some cases with large clearances the
doors could be pivoted in the ordinary way. When the doors are required to close
automatically we extend the rigid arms further above and below the cage to give
greater clearance and fix upon the cage a suitably shaped cam or tappet which pushes
the armi out of the way and closes the door.
An alternative method applicable to doors pivoted at some distance from the
threshold edge is to pivot the arms independently and actuate them from the door by
connecting links.
Dated this 1st dom
1000
H. B. BARLOW & GILLETT,
Agents for Applicants.
Improvements in Safety Appliances for Hoists.
We, ALBERT HUGH LLOYD, of 60 Dale Street, in the City of Manchester,
Manufacturer, and CHARLES HOPKINSON, of 29 Princess Street, in the City of
Manchester, Civil Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
Our improvements are primarily intended to prevent the doors of hoist well holes
Price 831

page_text: being left open when the hoist has moved away and consist of arrangements by which
the hoist door when opened locks the cage of the hoist so that the hoist cage cannot
move up or down until the door has been closed. In some cases instead of preventing
the movement of the cage we may make the cage as it moves away automatically
close the door,
Our invention is applicable to swing doors in one or two leaves and the door is
pivoted as near as possible to the edge of the hoist well; to the top and bottom of the
door (or either one of them as required) are attached a rigid arm or arms which do
not impede the path of the cage when the door is closed but when the door is opened
to an extent determined by the shape of the arm, the path of the cage is obstructed
against motion either up or down, or both, past the open door. The rigid arms may
be cranked or bent so as to lie in the clearance of the well hole and the obstructing
portion allows a sufficient clearance for variations of lovel in stopping the hoist. We
extend the doors so as to close on the reverse side of the jamb instead of in the
ordinary rebate on the front side but in some cases with large clearances the doors
could be pivoted in the ordinary way. When the doors are required to close
automatically we extend the rigid arms further above and below the cage to give
greater clearance and fix upon the cage a suitably shaped cam or tappet which pushes
the arm out of the way and closes the door.
An alternative method applicable to doors pivoted at some distance from the
threshold edge is to pivot the arms independently and actuate them from the door by
connecting links.
In the accompanying two sheets of drawings-
Figure 1 is an elevation and Fig. 2 a sectional plan of a hoist well door fitted with
our improved safety appliance.
Figure 3 is a sectional elevation and Fig. 4 a sectional plan of an automatic
arrangement of our improved safety appliance.
Figure 5 is a sectional elevation and Fig. 6 a sectional plan of an arrangement for
sliding doors.
Figure 7 is a sectional elevation and Fig. 8 a sectional plan of an arrangement for
swing doors which are pivoted on the outer side of the jamb.
Similar letters refer to similar parts throughout the several views.
In Figs. 1 and 2, a designates the hole or opening of the hoist well, the door,
e the jambs, d the threshold, e the arm fixed to the bottom of the door, the arm
fixed to the top of the door, and g the hoist cradle or cage.
The rigid arms ef are fixed to the bottom and top respectively of the door b which
is hinged or pivoted at. &¹ to the threshold d or to the jamb and similarly to the lintel
not shown,
When the door is closed as shown in full lines the arms ef lie back flush with the
wall of the hoist well and out of the way of the cradle g; but when the cradle has
stopped in its correct position opposite the door, and the latter is opened, as indicated
by dotted lines, Fig. 2, the arms ef turn with the door respectively under and over
the cradle g and the latter cannot move away either up or down until the door has
again been closed and the arms removed out of the way.
In Figs. 3 and 4 the door 6 is pivoted preferably on a shaft 6' on which is fixed
near the bottom the rigid arm e; on the under side of the cradle g is fixed a helical
or other suitably shaped cam h to act on the arm e and a similar but reversely set
cam, not shown, is fixed on the upper side of the cradle g to act on the arm f, not
shown, which is fixed near the top of the shaft b'. The length of the cam must be
suitable to the weight of the door the heavier the door the more gradual must the
taper or pitch of the cam be.
In operation the door is closed automatically by the cam A acting on the arm
when the cradle g moves downward and in like manner it is closed by the other
cam and arm f if the cradle moves upward.
In Figs. 5 and 6 the door is arranged to slide instead of swing as in the
preceding arrangements. In this case we mount a pinion i, horizontally near the
bottom of the door on an upright shaft ; which also has the rigid arm e fixed upon

page_text: it as well as the corresponding arm f (not shown) just above the top of the door.
The shaft j is carried and free to turn in bearings 1 secured to the closing side of
the door and below the threshold d also on the closing side of the door we fix a
rack m.
When the door b is opened the pinion i moving along the stationary rack m turns
the shaft and brings the arms e and into the path of the cradle g which cannot
move up or down until the door is again moved back when as it is about to close the
pinion i engages the rack m and turns the arms e and f back out of the way.
In Figs. 7 and 8 the arrangement is substantially the same as in Figs. 1 and 2,
the only difference being that in this case the door b is pivoted at 61 on the outer side
of the jamb c consequently the arms e and fare mounted on a shaft j which is
actuated by the pairs of links n secured to it and the door at top and bottom or
either one of them.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed it will be readily under-
stood that the details of the several arrangements may be varied or modified without
departing from the nature of our invention but we declare that what we claim is :-
1. The combination with the door of a hoist well, of arms or catches actuated
by the movement of the door about a pivot or alternatively by the sliding of the
door actuating a pivot shaft for the purpose of obstructing the path of the hoist
cradle up or down until the door has been closed substantially in the manner
herein set forth.
2. The several constructions combinations and arrangements of parts embodying our
improvements in safety appliances for hoists substantially as and for the purposes herein
described and as illustrated by the accompanying drawings.
Dated this 21st day of October 1896.
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicants.