Improvements in Apparatus for Operating the Safety Gates of Hoists or Lifts.
Year: 1898

page_text: Improvements in Apparatus for Operating the Safety Gates of Hoists
or Lifts.
We, JOHN BOTTERILL, of Washington Street, Kirkstall Road, Leeds, in the County
of York, Engineer, and JAMES WELLS, of 4, Roseberry Terrace, Milford Place,
Leeds, aforesaid, Millwright, 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 :-
The object of these improvements in apparatus for operating the safety gates of
hoists or lifts, is to obviate side movements of the cage, such as have hitherto been
caused by the action of the gate operating cams carried by such cage, and also the
friction between the cage and the guides resulting therefrom.
Fig. 1 of the accompanying illustrative drawings is a partial sectional elevation
of a well of a hoist or lift, provided with a centrally guided cage, and gate
operating apparatus according to this invention.
Fig. 2 is a corresponding sectional front elevation; and
Figs. 3 and 4, are elevations drawn to a larger scale and taken at right angles
to each other, of one of the pulley and roller carrying arms employed therein.
Fig. 5 is a partial side elevation of a hoist or lift wherein the cage is guided at
its four corners and which is provided with gate operating apparatus according to
this invention, but different from that shown in Figs. 1 to 4.
Fig. 6 is a corresponding front elevation.
Fig. 7 is a plan of a stop bar, hereinafter referred to.
Figs. 8 and 9 are respectively, an elevation and a plan drawn to a larger scale of
a cross beam, and Figs. 10 and 11, are elevations drawn to the same scale as
Figs. 8 and 9 and taken at right angles to each other of a pulley and roller carrying
lever.
In the case of a hoist or lift (Figs. 1 and 2) we secure to one side of the
centrally guided cage 1 two metallic cams 2 and 3, preferably made of angle iron
arranged on opposite sides of and at a short distance from the central vertical
guide 4. On the outer edges 5 and 6 of these cams, bear rollers 7 and 8 which are
mounted to revolve on studs 9 and 10, secured to the upper ends of arms 11 and 12,
to the lower ends of which are secured pins 13 and 14, mounted in bearings 15.
and 16 which are either secured to the floor or to a beam 17 secured in the shaft
of a hoist or lift.
On the studs 9 and 10 of the arms 11 and 12, there are also mounted to revolve
thereon chain or rope pulleys 18 and 19 (see Figs. 3 and 4). The gate lifting rope
or chain 20 may as shown have its end 21 secured to the outer end of the arm 11,
the other end 22 being passed around the pulley 18 of the arm 12 then around the
pulley 19 on the arm 11 under a guide pulley 23, over guide pulleys 24 and 25 and
finally secured to the safety gate 26, with this arrangement of the chain or rope,
the rollers 7 and 8 will be moved apart by the cams 2 and 3 to any extent equal to
only one third of the distance through which the gate 26 is to be lifted.
Di Q27

page_text: If it were desired that the movement apart of the pulleys should be one half
that of the lift of the gate, the pulley 18 would be dispensed with, and the end 21
of the chain or rope 20 would be secured to the outer end of the arm 12.
In the case of a hoist or lift having a cage 1 guided at its four corners (see
Figs. 5 and 6) we secure cams 2 and 3 back to back, in the example shown the 5
rollers 7 and 8 are mounted on two arms 11 and 12*, whose pivot pins 13° and 14*
are mounted in bearings 15 and 16* on a cross beam 27 which is secured to the
vertical guides 4 of the hoist or lift, the lower ends 11 and 12" of the levers 11*
and 12 being provided with balance weights 28 and 29.
Above the beam 27 on the vertical guides 4* is secured a bar 30 in which are
secured suitable stops 31 and 32, for the levers 11* and 12" to bear against when
drawn towards each other by the chain or rope 20 and the weight of the gate 26
after the cage has ascended or decended past the rollers 7 and 8.
The operation of the gate is the same in each case, the rollers 7 and 8 being kept
to the outer edges 5 and 6 of the cams 2 and 3 by the weight of the gate 26, and 1
constantly gradually approaching each other until they are left by the cams 2 and 3,
when the gate 26 will be at its lowest position, and the orifice to the well of the
hoist closed, the lifting operation of the gate being performed by the reverse
movement.
The two cams 2 and 3 besides serving to open or force the two levers 11 and 12
apart, prevent any lateral movement of the cage, and obviate friction between the
cage and the vertical guides, either with central or corner guides.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. For operating the safety gates of hoists or lifts the use of two cams secured
to the side of the cage in combination with two moveable levers operating the
lifting chain or rope in connection with the gate, substantially as described.
2. Apparatus for operating the safety gates of hoists or lifts, constructed
arranged and operating substantially as herein before described with reference
respectively to and illustrated in Figs. 1 to 4 inclusive and Figs. 5 to 11 inclusive
of the accompanying drawings.
of the accompanying drawings.
Dated this 25th day of January 1898.
R. E. P. CRAVEN,
Registered Patent Agent, King Street Chambers, 52, Wellington Street, Leeds,
Agent for the Applicants.