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Патент USA US2135188

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NOV. 1, 1938‘
D, LLmnQulsf
MOVING STAIRWAY
Filed Feb. 11, 1938
2,135,188
'
2 Sheets-Sheet 1
:UM LMWINVENTOR
BY
ATTORNEY
'Nov. 1, 1938.
D. |_. LINDQUIST
2,135,188
MOVING STAI RWAY
Filed Feb. 11, 1938
2 Sheets-Sheet 2
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ATTORNEY
2,135,188
Patented Nov. 1, 1938 7
_FUNIFTED STATES2,135,188PATENT. OFFICE
’
Moms STAIRWAY
David Leonard Lindquist, White Plains, N. Y.,
assignorto Otis Elevator Company, New York,
N. Y.,‘a corporation of New Jersey
‘Application February 11, 1938, Serial No. 189,974
6 Claims. (Cl. 198—16)
The invention relates to moving Stairways.
formation and this clearance is maintained dur
In present day moving stairway installations, ing the transition of ‘the'steps to platform for
it is the general practice to provide steps with
curved risers and with treads having a plurality
of longitudinally extending cleats; Combplates
are provided at the ends of the stairway, the
teeth of the combplates extending into the
grooves between the cleats and being inclined
upwardly therefrom to facilitate the exit of pasg
10 sengers. from the stairway. In previous con
structions, the ends of the cleats facing the
riser of an adjacent step‘ are beveled back to
minimize the clearance between the bottom of
the cleat grooves and' the riser when the'steps
15 are in step formation on the‘incline of the stair
way. This construction‘results in a V-shaped
‘ slot between the ends of the cleats of adjacent
steps when the steps are in platform formation
and about to pass beneath the combplate.
20 ~ The invention involves eliminating the V slots
between adjacent steps and providing a minimum
operating clearance between the end of the tread
cleats of each step and the 'riserof the adjacent
step while the steps are in step formation and
during their transition to platform formation.
In :carrying out the invention, the ends of the
cleats of each step facing the ends of the cleats
of the adjacent step at the time that the steps
are-in platform formation are made substantial
30 ly vertical and extend up to a minimum operat
ing distance therefrom. This provides a small
clearance between theends of the treads of ad
jacent steps both at the top of the cleats and
the bottoms of the tread grooves at the timethat
the steps pass beneath the combplate. The face
mation.
'
Features and ‘advantages of the invention will _
be apparent from the following description and
appended claims.
"
‘
In the drawings:
Figure 1 is a diagrammatic representation in
side elevation of the upper end of a moving stair
way embodying the invention;
'
»
10
Figure 2 is an" enlarged view, facing the riser,
of one of the steps of Figure‘ l; '
V Figure 3 is a view in section, taken along the
line.3—-3 of Figure 2, showing the construction
of the riser of the step shown in Figure 2 and
also illustrating the adjacent step‘ both in step
and platform formation with respect thereto;
and
'
‘
'
'
Figure 4 is a view taken along the line 4—4 of .
Figure 2.
I‘
20
‘
The stairway illustrated is of a present day
commercial construction. It comprises an end
less series of steps In driven atthe upper end of
the
stairway by means
of ~ sprocket wheels
through running gear chains, a sprocket wheel
and chain being arranged on each side of the
stairway. A sprocket wheel I! and running gear
chain I2 is illustrated for one side of the stair
way. - The sprocket wheels are driven by mech-'
anism (not shown).
7
30
Each step is mounted on step brackets ll, one
on each side of the stairway. ' Each step is pro
vided on each side with a chain wheel l8 and a
trailerwheel 20 mounted on bracket I'l. - These
wheels are arranged to run on tracks 2| and 22
respectively. A combplate 23 is provided at the
top of the stairway and a similar combplate (not
with the ends of the tread cleats of the adjacent ‘ shown) is provided at the bottom of the stair
step when the steps are in step formation and way. , The steps emerge from beneath the comb
plate at the entrance of the stairway in plat
40 during their transition to platform formation.
The top of the riser cleatsand the bottoms of form formation, transfer to a step formation on
their grooves are of different curvature, the the incline of the stairway, change back again
of the riser is provided with a plurality of ver
tically extending grooves to form cleats to mesh
curvature of the bottom of the. grooves corre-
sponding to the path of movement of the top
of the ends of the tread cleats of the adjacent
step as the step is transferred from step to plat
form formation and the. curvature of the top
of the riser cleats corresponding to the path of
movement of the bottom of the tread groovesof
50 the adjacent step as the transfer-takes place.
The size of the riser cleats with respect to the
40
to platform formation and pass under the comb
plate at the exit end of the stairway.
v
Referring particularly to Figures 2, 3 and 4,’
each step comprises a step frame I6‘ having a
riser portion 24 and a tread portion 25. 'Upon
the tread portion is mounted a tread plate 26
provided with a_ plurality of longitudinally ex
tending grooves 27 to form cleats 28. The end
3%] of the tread plate toward the riser of the ad
tread cleats is such as to provide a minimum . jacent'step' is made vertical, this vertical portion
operating clearance. Thus a minimum clearance
is provided between the tread and the riser of
55 the adjacent step while the steps are in step
extending below the bottoms of the grooves. The ~
body' portion of the tread plate extends out to
the end 30 to provide a bottom for the grooves 55
2
2,136,188
but is cut back slightly for purposes of operat
Other constructions, however, may be employed.
ing clearance.
For example, the riser portion of the step frame
may be curved and a facing provided having
cleats formed thereon. This facing may be
formed by stamping if desired instead of die cast
ing. Also, the riser portion of the step frame it
The riser portion 24 of the step frame is illus
trated as arranged at an'angle to the tread por
tion and is provided with a curved facing 32
formed with a plurality of vertically extending
grooves 33 to provide cleats 34. A liner 35 of
sound-deadening material is arranged between
the riser facing and the riserportion of the step
10 frame and also between the tread plate and tread
portion of the frame. The curvature of the
15
20
self may serve as the facing with the cleats
formed therein as by stamping. The cleated riser
may also be formed in other ways.
reversible.
25
30
i
.
The cleated riser may be used in conjunction 10
with a shallow grooved tread and short comb
riser cleats is such that the bottoms of the grooves ' plate such as disclosed in the co-pending applica
are parallel to the path of movement of the top tion of Arthur Edward Handy ?led January 22,
corner of the cleats of the adjacent step in the 1938, Serial No, 186,293. By making the depth of
transition of that step from step to; platform the tread cleats say' three-eighths of an inch, the 15
formation and that the top of the riser cleats is size of the riser‘ cleats may be considerably de
parallel to the path of movement of the bottom creased, thereby facilitating the formation of the
of the tread grooves at the end of the tread plate riser cleats by stamping.
of the adjacent step in the transition of that
Although the invention has been described as
applied to an ascending moving stairway, it is 20
step from step to platform formation. For con
venience, the steps shown in Figure, 3 have been to be understood that it is equally applicable, to
designated “step No. l” and “step No. 2”. In the descending stairways and to those which are
case of these steps, for example, the path of
As many changes could be made in the. above
movement of the top corner of the end 30 of the
tread cleats of step No. 1 is the arc of a circle of construction and many apparently widely differ 25
a radius equal to the step pitch, 1. e., the distance ent embodiments of this invention could be made
between adjacent chain wheel axles, and swung without departing from the scope thereof, it is
from a center at the top corner of the correspond
intended that all matter contained in the above
ing end 30 of the tread cleats of step No. 2; and description or shown in the accompanying draw;
the path of movement of the bottom of the tread ings shall be interpreted as illustrative andnot 30
groove of the end 30 of the tread of step No. 1 is
the arc of a circle of the. same radius but swung
from a center at the corresponding point on the
end 3!! of the tread of step No. 2. The curve of
35 the bottom of the riser groove of step No. 2 and
the curve of the top- of the riser cleat of step No. 2
are swung from the above centers respectively,
the radius in each case being slightly less for
purposes of operating clearance. The end 31 of
40 the tread plate of step No. 2 is made the chord of
the circle of curvature of the riser grooves, inter
secting the circle at the top of the tread plate
and the bottom of ?ange 42 on the tread plate.
With this arrangement, the end of the cleat of
45 each step is maintained at a constant minimum
clearance from the riser of the adjacent step both
at the top of the tread cleat and the bottom of
the end of the tread groove, as the transition from
‘step to platform formation is made. Also, the V
50 groove is eliminated, there being only a small
clearance between the step treads when the steps
are in platform formation. >
‘
.
in a limiting sense.
1
What is claimed is:
'
-
,
1. In a moving stairway in which each step‘ has
a riser and a tread, with the tread provided with
a plurality of longitudinally extending grooves
to form cleats for meshing with theteeth of‘ a
comb at the end of the stairway, the construction
of the steps in which the ends of the cleats'of'the
tread of each step toward the riser of .the adja
cent step when these steps. are in platform for 40
mation are substantially ‘parallel to the ends of
the cleats of the adjacent step, the grooves be
tween said cleats. being closed‘ at their bottoms
out to saidends of the cleats, and‘ in which the
riser of each step has a curved face provided with 45
a plurality of upwardly extendingrcurved cleats
for meshing with the ends of the tread cleats of
the adjacent step while these steps are in step for
mation and during the transition thereof to plat
form formation.
.
50
2. In a moving stairway in which each step has
a riser and a tread, with the tread provided with
a plurality of longitudinally extending cleats for
meshing with the teeth of a combat the end of
the stairway, the construction of the steps in
The riser facing 32 in the construction illus
trated is in the form of a die casting. It is pro
55 vided with strengthening ribs 38 extending cross
wise of the riser and alsovertical strengthening which the ends of the cleats of the tread of each
ribs 40. Across the top of the riser facing there . step toward the riser of the adjacent step are'sub
is formed a lip portion 4|. This portion hooks in stantially at right angles to the top of the‘ tread,
in which the riser of each stepv has a curved
behind
?ange 42 to secure the facing in place at and
60
face provided with a plurality of upwardly ex
the top. At the bottom the riser facing is held
tending curved cleats for meshing with the ends
in .place by means of a clamp 43, a horizontal‘ of the tread cleats of the adjacent step while
?ange portion 44 being formed on the bottom of these steps are in step formation and during the
the riser facing and being positioned in back of
The clamp
65 the hooked portion 45 of the clamp.
is tightened in place by means of a bolt 46 which
extends through an aperture in the return 41 of
step riser portion 24. The end 48 of the vclamp
opposite the hooked portion is arranged on an
angle
to slide on the return 41 to clamp the riser
70
into position as the bolt is tightened.
The riser facing illustrated is of pleasing ap
. pearance and strong construction, the ribs aiding
materially to-strengthen the step, particularly. in
75 preventing the yielding of the steps on the sides.
transition thereof to platform formation, the
curvature of said riser face between the ‘cleats 65
and the curvature of the tops of the riser cleats
being‘ such as ‘to provide substantially‘ constant
operating clearance between the‘ riser and the
ends. of the cleats of the adjacent step while the
steps are in platform formation and during said
transition.
I
3. In a moving stairway in which each step has
a riser and a tread, with the tread provided‘with
a plurality of longitudinally extending grooves to
form cleats for meshing with‘the teeth of a comb
2,135,188
at the end of the stairway, the construction of the
steps in which the ends of the cleats of the tread
of each step toward the riser of the adjacent step
are substantially at right angles to the top of the
Ci tread, the bottoms of the grooves extending out
to said ends of the cleats, and in which the riser
of each step has a curved facing provided with a
plurality of upwardly extending grooves to form
, cleats for meshing with the ends of the tread
10 cleats of the adjacent step during the transition
of these steps from step to platform formation,
the tops of the riser cleats and bottoms of the
grooves being of such curvature that the curves
intersect at the tread.
4. In a moving stairway in which each step has
a curved riser and a tread, with the tread pro
vided with a plurality of longitudinally extending
grooves to form cleats for meshing with the teeth
of a comb at the end of the stairway, the con
he)
struction of the steps in which the ends of the
cleats of the tread of each step facing the riser
of the adjacent step are vertical throughout the
height of the cleats, the bottoms of said grooves
extending out to said ends of the cleats, and in
which the riser of each step is provided with a
plurality of upwardly extending grooves to form
cleats for meshing with the ends of the tread
cleats of the adjacent step during the transition
of these steps from step to platform formation,
30 the bottoms of the riser grooves being of .a curva
ture in accordance with the path of movement of
the top of said ends of the tread cleats of the
‘adjacent step during such transition and the
3
cleats of the tread of each step facing the riser of
the adjacent step are perpendicular to the top
of the tread, the bottoms of said grooves extend
ing out to said ends of the cleats, and in which
the riser of each step is provided with a plurality
of upwardly extending grooves to form cleats for
meshing with the ends of the tread cleats of the
adjacent step during the transition of these
steps from step to platform formation, the bot
toms of the riser grooves being of a curvature 1O
concentric with the path of movement of the top
of said ends of the tread cleats of the adjacent
step during such transition, with the size of the
curve such as to provide minimum operating
clearance therebetween, and the tops of the riser 15
cleats being of a curvature concentric with the
path of movement of the bottoms of the grooves
of said adjacent step tread at said ends of the
- tread cleats during such transition, with the size
of the curve such as to provide minimum operat
ing clearance therebetween.
6. In a moving stairway in which each step has
a curved riser and a tread, with the tread pro
vided with a plurality of longitudinally extending
grooves to form cleats for meshing with the teeth 25'
of a comb at the end of the stairway, the: con
struction of the steps in which the end of the
cleats of the tread of each step facing the riser
of the adjacent step is perpendicular to the top
of the tread, the bottom of said grooves extending 30
out to said end of the cleats, and in which the
riser of each step is provided with a plurality of
upwardly extending grooves to form cleats for
tops of the riser cleats being of a curvature in ac
meshing with the tread cleats, of the adjacent
cordance with the path of movement of the bot
step at said end thereof during the transition of 35
toms of the grooves of said adjacent step tread at
said ends of the tread cleats during such transi
these steps from step to platform formation, the
tion.
swung from the top’ of said end of the tread
-
5. In a moving stairway in which each step has
40 a curved riser and a tread, with the tread pro
bottom of the riser groovesbeing of a curve
cleats and the top of the riser cleats being of a
curve swung from the bottom of the grooves of 40
vided with a plurality of longitudinally extend-_ the step tread at said end of the tread cleats, each
ing grooves to form cleats for meshing with the of said curves being‘ of a radius equal to the step
teeth of a comb at the end of the stairway, the pitch less operating clearance.
,
construction of the steps in which the ends of the
‘
DAVID LEONARD LINDQUIST.
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