Improvements in Safety-apparatus for Hoists or Lifts.
Year: 1898

page_text: Date of Application, 22nd Apr., 1898-Accepted, 18th June, 1898
COMPLETE SPECIFICATION.
Improvements in Safety-apparatus for Hoists or Lifts.
We, JOHN BOTTERILL, of Washington Street, Kirkstall Road, Leeds, in the
County of York, Engineer, and ROBERT EDWIN PEACOCK CRAVEN, of 2, Highthorn
Villas, Armley, Leeds aforesaid, 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 consists of improvements in safety-apparatus for hoists or lifts.
Apparatus constructed in accordance therewith are shown in the accompanying
drawings.
Fig. 1 is a partial side elevation of a hoist provided with apparatus for operating
a safety-gate or the like (hereinafter called a gate), Fig. 2 is a corresponding
front elevation, and Fig. 3 a partial plan of the apparatus ; Fig. 4 is a front
elevation of a modification of the sector shown in Fig. 1.
Figs. 5 and are views corresponding to Figs. 1 and 2 representing another
example of gate-operating apparatus according to this invention; Figs. 7 and 8
are respectively a partial plan and a partial elevation thereof drawn to a larger
scale; and Figs. 9 and 10 are respectively a side and a front elevation of an operating
lever used therein.
Fig. 11 is a diagrammatic front elevation showing another example of gate-
operating apparatus, and Fig. 12 is a plan thereof.
Fig. 13 is a partial side elevation representing a modification of the apparatus
shown in Figs. 11 and 12.
Figs. 14, 15, and 16 are diagrammatic views, Fig. 14 representing means for
operating simultaneously two gates on the same level and Figs. 15 and 16
representing the arrangement of, and means for operating, respectively two and
three gates used for closing a single opening, in order to reduce the height of lift
required.
In the example shown in Figs. 1, 2, and 3, there is secured to one side of the
cage 1 of the hoist a metallic cam 2 preferably made of angle-iron and comprising
two inclined portions 3 and 4 diverging from a rounded part 5 in the centre of its
length. 6 is a straight guide-bar placed vertically on the cage and forming edges
and 8 with the cam 2 where it meets the latter.
Instead of making the part 5 between the inclined parts 3 and 4 rounded as
shown, it is preferred to make this part straight as shown in Fig. 13; or the cam
may be made curved from end to end as shown in Fig. 11. Against the bar there
is arranged to roll a runner 9 which is mounted to rotate on a stud 10 secured in a
frame 11 fixed to the guides 12 and 13. Against the inclined parts 3 and 4 of the
cam there is.arranged to roll a runner 14 mounted to rotate on a stud 15 secured in a
toothed sector 16 mounted to oscillate on a stud 17 secured in a part 18 projecting
from the main frame 11. The toothed sector 16 is provided with an arm 19 carry-
ing an adjustable weight 20, and gears into a toothed pinion 21 secured to one end
of a shaft 22 which is mounted in a bearing 23 .and on the other projecting end of

page_text: which is secured a winding-drum 24. To this winding drum 24 is secured one end
25 of the gate-lifting rope or chain 26, which passes over guide-pulleys 28, 29,
and 30 and is secured to the gate 31.
Instead of securing the stud 15 of the runner 14 to the toothed sector as shown
in Fig. 1, it may be secured in the end of an arm 32 projecting from a portion 33
of the toothed sector 16, as shown in Fig. 4. As the cage rises or descends and the
cam 2 approaches the runners 9 and 14, the inclined part 3 or 4 bears against
the runner 14 and thereby forces it sidewise, rotating the sector 16 and consequently
the pinion 21 and drum 24, and raising the gate 31, lateral movement of the cage
and consequent friction on the guides 12 and 13 being prevented by the guide-bar 6.
As the cage moves away again the part 3 or 4, as the case may be, allows the
parts to be brought gradually back to their initial positions by gravity.
of
In the example shown in Figs. 5 to 10, the stud 15 of the runner 14, instead
being mounted on a sector 16 is mounted on the outer end
of an arm 34 arranged to oscillate on a stud 35 secured in EL
fixed bracket 36. The upper end of the arm 34 is provided with lugs 37
and 38, the lug 37 being connected by means of a rope or chain 39 with a
weight 40 and the lug 38 being connected by means of a rope or chain 42 to a
pulling drum 41, which takes the place of the toothed pinion 21 shown in Figs. 1
and 2. The oscillating arm 34 may be provided with an arm 43 carrying an
adjustable weight 44, which will then take the place of the weight 40.
In the example shown in Figs. 11 and 12 there are used two arms 45 and 46,
which are arranged to oscillate on pins 47 and 48 in fixed bearings 49 and 50. In
the upper end 51 of the arm 46 is secured a stud 52 on the projecting end of which
revolve a grooved pulley 53 and a runner 54; and at the upper end 55 of the
arm 45 is mounted in a bearing 56 a shaft 57, on the outer end of which is secured
the winding drum 24. On the inner projecting end of the shaft 57 is secured the
pulling drum 41 and close to it there is mounted to rotate a runner 58. To a
lug 59 on the arm 45 is secured one end 60 of the pulling chain or rope 42, which
passes around the grooved pulley 53 and is secured at its end 61 to the pulling
drum 41. One end of the lifting rope or chain 26 is secured to the lifting drum 24,
the rope or chain passing over guide-pulleys 28, 29, and 30 to the gate 31 as above
described. The runners 54 and 58 are arranged to roll on the surfaces 62 and 63
of two cams 64 and 65, which face in opposite directions in order to prevent lateral
movement of the cage. The provision of the two arms 45 and 46 and the arrange-
ment of the pulling chain or rope 42 enable the gate to be lifted by a drum 24 of
given size with cams adapted to produce very little lateral movement.
In Fig. 13 there is shown one oscillating arm 46ª similar to that shown in
Figs. 11 and 12 and arranged to oscillate on a stud 48 in a bearing 50", the
end 55 of the arm being provided with a fixed stud 52" furnished on its projecting
upper
end with a grooved pulley 53" and a runner 54". The rope or chain 42 is fixed at
one end 60 to the main frame 11, passes around the grooved pulley 53", and is
secured at its other end to the pulling drum 41, whose shaft is mounted in a fixed
bearing as in the example shown in Figs. 5 to 10. The cam 2 shown has a flat
part 66 provided at the centre of its length for the purpose of enabling the gate to
steady itself before descending after reaching its highest position, so as to prevent
jarring in the guides on descending.
Fig. 14 represents an arrangement in which two gates 31 and 31° of a hoist
corresponding to two openings opposite each other on the same floor are both
connected by lifting ropes or chains 26 and 26" respectively, to a single drum 24
so as to be operated simultaneously thereby.
Fig. 15 represents an arrangement in which two gates 31 and 31b of a hoist are
placed one above the other in different guides so as to close a single opening and are
connected by ropes or chains 26 and 26b to drums 24 and 67 secured on a common
shaft, the diameters of these drums being such that the two gates will simul-
taneously reach such a height as to free the opening.
Fig. 16 represents a modification of this arrangement in which three gates are

page_text: used for closing a single opening, being placed one above another, in different
guides, and connected by ropes or chains 26, 26, and 26° to drums 24, 68, and 69
secured on a common shaft and of proper diameters to cause the bottom edges of
the gates to reach the top of the opening simultaneously.
The arrangements shown in Figs. 15 and 16 are intended for use in cases where
there is not sufficient space in which to raise a gate of the full height required to
close an opening.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. Safety-apparatus for a hoist or lift in which a safety-gate is carried by one
end of a suitably guided rope or chain the other end of which is secured to the
periphery of a winding drum arranged to be rotated by a cam or cams which is or
are secured to the cage and which or one of which is adapted to give movement
to a runner connected with the winding drum either through toothed gearing
or through a chain or rope and pulling drum, substantially as hereinbefore
described.
2. Safety-apparatus for a hoist or lift comprising means for operating two or
more gates simultaneously through a single winding-drum shaft, substantially as
hereinbefore described.
3. Safety-apparatus for a hoist or lift in which two or more gates are arranged
one above another to close a single opening, and means are provided for operating
the gates simultaneously and so that their bottom edges will simultaneously reach
the top of the opening controlled by the gates, substantially as hereinbefore
described.
4. Safety-apparatus for hoists or lifts constructed arranged and operating as
hereinbefore described with reference respectively to and shown in Figs. to 4
inclusive, in Figs. 5 to 10 inclusive, in Figs. 11 and 12, in Fig. 13, in Fig. 14, in
Fig. 15, and in Fig. 16 of the accompanying drawings.
Dated this 22nd day of April 1898