Improved Safety Device for Elevators.
Year: 1890

page_text: Date of Application, 6th Sept., 1890
Complete Specification Left, 6th June, 1891-Accepted, 22nd Aug., 1891
PROVISIONAL SPECIFICATION.
Improved Safety Device for Elevators.
I, JOHN PITT Bayly, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, do hereby declare the nature of this invention (a communi-
cation to me from abroad by Philipp Schmidt, of La Crosse, Wisconsin, U.S.A.
Inventor,) to be as follows:--
This invention has reference to a certain new and useful safety device for
elevators; whereby should the chain, rope, or other part of the mechanism break,
the motion of the lift is immediately arrested without injury to the passengers.
By this invention the under side of the lift is provided with a pendant hanger,
in which are pivoted midway their length, two arms, in such manner that one
end of each rests, and is adapted to slide against the under side of the elevator
platform.
The remaining ends of these cross levers are enlarged, and are formed_with
grooves adapted to engage with and impinge the guides of the elevator frame
when required. Upon the pivot carrying these levers is suitably mounted a lever,
one of its free ends being secured to a pendant hanger, and its other end having a
rope attached to it, which passes up from the platform of the elevator, over a
pulley, and has its free end secured to a weight. A rope likewise passes upwards
from the end of the last named lever to another lever which is pivoted in the upper
portion of the elevator, and which lever carries at its other end a rope, bearing a
pendant weight within the elevator.
By this mechanism, in case of any of the clevator mechanism failing, the levers
beneath the platform of the elevator are raised in such manner that the weight of
the car, upon the sliding ends of said levers, cause their opposite ends to impinge
the elevator guides, and arrest the motion.
Dated this 6th day of September 1890.
J. F. BAIGI,
Applicant.
COMPLETE SPECIFICATION.
Improved Safety Device for Elevators.
I, Joux PITT BAYLY, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, do hereby declare the nature of this invention (a com-
munication to me from abroad by Philipp Schmidt, of La Crosse, Wisconsin, U.S.A.
Inventor,) and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :--
The objects of this invention are to provide a simple device which may be
actuated by manual or other power, and that will automatically lock the elevator-
case or platform instantly if the hoisting rope or chain breaks, and further to
furnish the elevator-mechanism with means for controlling the ascent or descent of
the platform or cage, from said moving cage or platform, and also from without the
same at different points.
With these ends in view my invention consists in certain features of construction
and combination of parts which are hereinafter described and indicated in the
claims.
Reference is to be made to the accompanying drawings forming a part of this
Specification in which similar letters of reference indicate corresponding parts in
all the figures

page_text: Fig. 1 is a side elevation with its frame broken below the platform, the locking-
mechanism being in loosened adjustment to permit free reciprocal movement of the
elevator-platformu.
Fig. 2 is a side elevation, partly sectional, of the device with safety attachment
in locking adjustment holding the platform firmly secured to the frame.
Fig. 3 is a plan in section of the elevator-fraine, taken on the line 3 3 in Fig. 1,
showing the locking mechanism in loose adjustment, and
Fig. 4 is a perspective view of one limb of the locking device detached from the
elevator.
The frame A of the elevator consists of two upright oppositely-located parallel
timbers, or metal beams may be used therefor. These frame uprights are held
spaced apart by the usual rectangular well-hole frame at each floor, one of said
frames being hown broken off at a in Figs. 1 and 2. There are projecting
tongues formed upon the inner faces of the upright frame timbers A, or these may
be attached thereto, if preferred, said tongues being adapted to retain the platform
or cage B in sliding contact with the upright frame-timbers, there being grooved
guide-standard secured to the opposite sides of the platform B, which standards
are connected at their upper end- by the transverse beam d. The grooves of the
standards having sliding contact with the guide tongues retain the platform from
lateral displacement, free to move vertically upon the frame.
"
Upon the transverse beam d. near its centre of length, a heavy weight e, pre-
ferably in form of a rectangular block, is suspended by two vertical parallel opposite
limbs that are connected to the block by their lower ends, and so placed apart
that they will loosely embrace the sides of the beam d and be held from displace-
ment by the plates which form keepers for the limbs, and are secured to the
bean by any suitable means. The upper ends of the limbs are held connected by
the parallel eruss-bolts that pass through aligning perforations in the end portions
of the limbs, and are therein secured by nuts on their ends. On the top boli h a
flexible rol, preferably of wire, is attached which extends over a pulley that
is bracketed to the upper cross timber A' of the frame, and thence the wire rope is
led downwardly to an elevator drum. or other similar device, actuated by hand or
power, whereby the cage or platform B is suspended and controlled.
"
At the centre of and beneath the platform B a strong bracket-frame k, having
two spaced limbs, is attached, this bracket being secured to transverse timbers of
the platform-frame. The space between the limbs of the bracket k is proportioned
to receive the lapped bodies of the locking-arms m, and permit them to vibrate
freely. At the point where the arms m cross each other, which is near their
longitudinal centres, said arms are reduced in thickness one-half, so that when the
thinner portions of the arms are adjusted together in the form of a lapped pliers-
joint the main portions of the same will have their sides level and parallel. The
limbs of the bracket-frame k, which is designed to support the locking-arms m, are
oppositely-perforated at proper points, these holes being vertically elongated a
proper degree to allow the transverse bolt or journal-pin to slide in the slot
slightly when the arms are vibrated thereon. A short bend is produced in the
arins near their lower terminals in such a degree as to align the rectangular
enlargements o of said ends with the vertical adjusting faces of the frame timbers A.
The lower ends o of the cross-arms are grooved on their faces to permit the
same to loosely embrace the sides of the tongues b, the parallel flanges produced
by the channels mentioned being designed to abut squarely against the main faces
of the frame timbers A when the arins in are adjusted to lock the platform 13 fast
to said timbers, and to afford a surface which will not be liable to slip and also
to slightly cushion the impact of the arms thereon. A fastening may be secured
upon the flanges o' of the ends o, which will engage the vertical timbers A when
free to do so.
To afford means for automatically spreading the arms m, and consequently
locking the platform B from falling, two parallel bars are employed. These are
pivoted by our end of each to the depending spaced-hangers p', the flanges p² of

page_text: r
n,
which are secured to the under side of the platform timbers. At the longitudinal
centres of the bars p slightly oblong orifices are formed, which extend longitudinally,
so that these elongated orifices have their major axis at right angles to the
vertically-elongated bolt-holes in the limbs of the hanger bracket & which carries
the arms m, and as these holes cross each other it is evident that the bolt which
passes through all, may slide a limited distance vertically and horizontally in the
slots named, whereby free adjustment is afforded to the arms m, which are also
engaged by said bolt n. It will be noticed that the upper ends m' of the arms m
have a bearing or loose contact with the centre timber of the platform-frame which
is necessary for the proper operation of the arms when adjusted to lock fast against
the upright timbers A. Upon the beam da low bracket-stand is secured between
the limbs, and one upright frame-timber A, upon which is pivoted the tripping-
levers, the point of pivot-support of which is nearer to one end, thus affording
increased leverage to the long arms s' of this lever. At near the terminal end
of the short arm of the pivot tripping-levers a connecting-rod is loosely joined
thereto by its upper end, the lower end of the rod being fastened to a transverse
spacing-bolt which is secured to the free ends of the parallel bars p, and upon
the same bolt a short lanyard is attached by one end, its upper portion engaging
a bracketed pulley 2, hangs pendent therefrom, and has a weighted handle block t
on its terminal. A rope u is attached by one end to the terminal of the tripping-
levers, and is extended upwardly engaging the bracket-supported pulley, thence
to the similarly-supported pulley which is attached to depend from the end of
an outwardly projecting portion of the arm e, which latter may be a part of a
well-hole frame. From the pulley u² the rope u depends, it being extended
downwardly through the building to the basement or lower floor, close to the
elevator.
•
On the end of the long arm s' of tripping-levers a rod or wire rope w is fastened,
which hangs pendent, it being of proper length to afford convenient means to
depress this end of the lever manually by the occupant of the platform B. An
elongated metal billet w being placed on or attached to the lower end of the rod wo
serves to depress the end of the tripping-lever it is attached to, when free to do so.
It will be noticed that on account of superior weight the lower ends of the locking-
arms m will drop sufficiently to remove their bearing-faces from secure contact with
the sides of the frame timbers A, the slots in the parallel bars p and limbs of
bracket allowing such an adjustinent to take place when the main hoisting-rope C
is drawn and the elevator-platform B hoisted.
In explanation of the co-acting adjustment of parts that effects a release of the
locking-arms in from the frame-guide-posts A when the platform is free to move, as
shown in Fig. 1, the block e is lifted by a draft upon the rope C until it engages
the lower side of the transverse beam d, which will remove the lower cross-bolt h
from contact with the long arm of tripping-levers, thus permitting the ends of
the prrallel bars p, by their connection thereto, to rock the tripping-lever on its
pivotal support, the depression of the ends of these bars being effected by the
imposed weight of the locking-arms m and their own weight also. When the parts
arc in adjustment, as shown in Fig. 1, there is but little frictional resistance to the
upward or backward motion of the platform B through the rope C', and in case the
elevator is operated manually from the platform by draft on the rope C, said
platform can be stopped at any point by slacking the rope C and pulling on the
weight or the handle-block on the lanyard t, either of which raises, the free
ends of the parallel bars and spread the locking-arms m. In case other power is
used which is located below the elevator, and the latter is employed for freight
elevation, the rope u may be used to lock the platform B at any desired point when
motion is arrested. If the main rope C is suddenly broken while the occupied
elevator is being raised, the instantaneous fall of the heavy block e will permit the
pendent counterbalancing weight or billet w' to fall, which in turn will lower the
I' elevate
tripping-lever long arms, and by its connection with the parallel bars
their free ends, which will draw the crossed locking-arms m up, so that the enforced

page_text: contact of their upper ends m³ with the elevator-platform will spread them and
force their lower ends against the guide-posts A, the weight of the released
platform and load added rendering the contact of the arus more secure.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :
1. In an elevator, two cross and pivot locking-arms supported loosely from the
lower side of an elevator-platform, with their upper ends free to slide outward
upon the said lower side, and at their lower ends adapted to spread and engage
frictionally the sides of the elevator-frame when the platform is falling, substantially
as set forth.
2. The combination, with the vertical guides and the platform or cage, of two
crossed pivoted locking-arms suspended from the lower side of said platform or
cage, with their upper ends in sliding contact with the said lower side, and their
lower ends extending adjacent to the respective guides, and provided with clamping
faces, an operating-bar pivoted on the platform and connected with the pivot of
said two arms, and means for operating said bar, whereby when the two arms are
raised their upper ends will slide apart on the lower face of the platform to
throw their opposite ends against the said guides, substantially as set forth.
3. The combination, with a frame having two parallel uprights that serve as
guides, and a draft-rope for the platform, of two cross pivoted locking-arms which
are hung below from the platform with their upper ends in sliding contact with
said platform, and their lower ends adjusting to said guides, and devices which will
spread the arms and cause their lower ends to clutch the frame-guides, substantially
as set forth.
4. The combination, with an elevator-frame, having two upright opposite parallel
guides, a platform between the guides loosely engaged therewith, upright standards
on the platform that are connected by a transverse beam, a heavy weight pendent
from the transverse beam and adapted to slide vertically a limited distance, and a
draft rope attached to this slide weight, and a pair of crossed pivoted locking-
arms hung below from the platform with their upper ends in sliding contact with
the lower side of the platform, and their lower ends adjacent to the respective
guides, and devices which connect the weight above with the locking-arms below,
whereby the latter are made to clutch the frante-guides when the platform falls at
abnormal speed, substantially as set forth.
5. The combination, with two upright, opposite, and parallel guides of an elevator
frame, a sliding-platform that has its upright standards in loose engagement with
the guides, a vertically sliding weight loosely supported by a cross beam on its
posts, an extended draft-rope which is attached to the sliding-weight, and a tripping-
lever pivoted near one of its ends upon the transverse beam of the platform guide-
posts, of two pendent crossed and pivoted locking-arms which are hung below the
platform frame, therefrom to parallel bars having pivotal support at one end, and
also near their centre upon the bracket-limbs which carry the locking-arms, n
connected rod between the free ends of the parallel bars having pivotal support
at one end, and also near their centre upon the bracket-limbs which carry the
locking-arms, a connecting-rod between the free ends of the parallel bars and
the short arm of the tripping lever, and a pull rod or rope having a weight
thereon which is pendent from the long arm of the tripping-lever, substantially as
set forth.
Da bi cal
1001
J. P. BAYLY,
Applicant.