Escalator with high speed inclined section

Details Escalator with high speed inclined section Escalator with high speed inclined section

2002-10-18

2003-07-08

Bidwell, James R. (Department: 3651)

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

By support means having a zone of varying speed

Reexamination Certificate

active

06588573

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an escalator with a high speed inclined section in which the steps move faster in the intermediate inclined section than in the upper and lower landing sections.
2. Description of the Related Art
FIG. 11
is a side view showing a main portion of the conventional escalator with a high speed inclined section disclosed, for example, in JP 51-116586 A. In the drawing, a main frame
1
is provided with a plurality of steps
2
connected in an endless fashion and circulated. Each step
2
has a tread
3
, a riser
4
formed by bending a lower-step-side end portion of the tread
3
, a step link roller shaft
5
extending in the width direction of the tread
3
, a pair of step link rollers
6
rotatable around the step link roller shaft
5
, a trailing roller shaft
7
extending parallel to the step link roller shaft
5
, and a pair of trailing rollers
8
rotatable around the trailing roller shaft
7
.
The step link roller shafts
5
of the adjacent steps
2
are connected to each other by a pair of link mechanisms
9
. Each link mechanism
9
is provided with an auxiliary roller
10
.
The main frame
1
is provided with a pair of main tracks
11
forming a loop track for the steps
2
and guiding the step link rollers
6
, a pair of trailing tracks
12
for guiding the trailing rollers
8
and controlling the attitude of the steps
2
, and a pair of auxiliary tracks
13
for guiding the auxiliary rollers
10
and varying the distance between the adjacent steps
2
.
In this conventional escalator with a high speed inclined section, the auxiliary roller
10
is displaced with respect to the step link roller shaft
5
according to the configuration of the auxiliary tracks
13
, whereby the link mechanism
9
undergoes deformation so as to fold and stretch, varying the distance between the adjacent step link roller shafts
5
. Due to this arrangement, the moving speed of the steps
2
is varied according to the position in the loop track. That is, in the upper and lower landing sections, they are run at low speed, and in the intermediate inclined section, they are run at high speed.
In the conventional escalator with a high speed inclined section constructed as described above, the riser
4
has a flat configuration, whereas the auxiliary track
13
in the speed changing region has a smooth arcuate configuration. Thus, during the process in which adjacent steps
2
undergo a change in difference in level, the end portion of the tread
3
is not displaced along a locus extending along the surface of the riser
4
of the upper adjacent step
2
, and either interferes with the riser
4
or allows a gap to be generated between it and the riser
4
.
SUMMARY OF THE INVENTION
This invention has been made in view of the above problem in the prior art. It is an object of this invention to provide an escalator with a high speed inclined section in which during the process in which the adjacent steps undergo a change in level difference, it is possible to prevent both interference of the tread with the riser of the adjacent step and generation of a gap between the riser and the tread.
To this end, according to one aspect of the present invention, there is provided an escalator with a high speed inclined section, wherein when axes of adjacent step link roller shafts are in an upper speed changing section, and, assuming that relative coordinates in horizontal and vertical directions of the axes of the step link roller shafts are (X
S
, Y
S
), that radius of curvature of movement locus of the axis of the step link roller shaft in an upper curved section is R
1
, and that a point vertically spaced apart by −R
1
from a border point which is in the movement locus of the axis of the step link roller shaft and between an upper landing section and the upper curved section is the origin of a coordinate system, when Y
s
is in the following range:
−R
1
+{square root over ( )}(
R
1
2
−X
S
2
)≦
Y
s
<0
a relationship between relative positions of the adjacent step link rollers in the upper speed changing section, horizontal coordinate X
1
of the axis of the upper-step-side step link roller shaft, horizontal coordinate Y
1
of the axis of the upper-step-side step link roller shaft, horizontal coordinate X
2
of the axis of the lower-step-side step link roller shaft, and horizontal coordinate Y
2
of the axis of the lower-step-side step link roller shaft can be expressed by the following equations:
X
1
=−X
s
+{square root over ( )}(−2
R
1
·Y
S
−Y
S
2
),
Y
1
=R
1
,
X
2
=X
1
+X
S
,
and
Y
2
=Y
1
+Y
S
.
Also, a position of a link connection point is determined by the following equations:
X
M
=X
1
+L
1
cos {&bgr;−&ggr;},
and
Y
M
=Y
1
+L
1
sin {&bgr;−&ggr;}
(where
&bgr;=tan
−1
{(Y
1
−Y
2
)/(X
1
−X
2
)};
&ggr;=cos
−1
{(L
1
2
−L
2
2
+W
2
)/2L
1
W};
W={square root over ( )}{(X
1
−X
2
)
2
+(Y
1
−Y
2
)
2
};
X
M
: the horizontal coordinate of the link connection point;
Y
M
: the vertical coordinate of the link connection point;
L
1
: the distance from the axis of the upper-step-side step link roller shaft to the link connection point; and
L
2
: the distance from the axis of the lower-step-side step link roller shaft to the link connection point).
According to another aspect of the present invention, there is provided an escalator with a high speed inclined section, wherein when axes of the adjacent step link roller shafts are in the upper speed changing section, and, assuming that relative coordinates in horizontal and vertical directions of the axes of the step link roller shafts are (X
S
, Y
S
), that radius of curvature of movement locus of the axis of the step link roller shaft in the upper curved section is R
1
, that an inclination angle of the intermediate inclined section is &agr;
m
, and that a point vertically spaced apart by −R
1
from a border point which is in the movement locus of the axis of the step link roller shaft and between the upper landing section and the upper curved section is the origin of a coordinate system, when Y
s
is in the following range:
R
1
cos &agr;
m
{square root over ( )}{(
R
1
cos &agr;
m
)
2
+(2
R
1
sin &agr;
m
·X
S
−X
S
2
)}≦
Y
S
<−R
1
+{square root over ( )}(
R
1
2
−X
S
2
)
a relationship between relative positions of the adjacent step link rollers in the upper speed changing section, horizontal coordinate X
1
of the axis of the upper-step-side step link roller shaft, horizontal coordinate Y
1
of the axis of the upper-step-side step link roller shaft, horizontal coordinate X
2
of the axis of the lower-step-side step link roller shaft, and horizontal coordinate Y
2
of the axis of the lower-step-side step link roller shaft can be expressed by the following equations:
X
1
=[−p
1
q
1
+{square root over (
0
)}{(
p
1
q
1
)
2
−(
p
1
2
+1)(
q
1
2
−R
1
2
)}]/(
p
1
2
+1),
Y
1
={square root over ( )}(
R
1
2
−X
1
2
),
X
2
=X
1
+X
S
,
and
 
Y
2
=Y
1
+Y
S
(where, p
1
=X
S
/Y
S
, and q
1
=(X
S
2
+Y
S
2
)/2Y
S
).
Also, the position of the link connection point is determined by the following equations:
X
M
=X
1
+L
1
cos {&bgr;−&ggr;},
and
Y
M
=Y
1
+L
1
sin {&bgr;−&ggr;}.
According to a still further aspect of the present invention, there is provided an escalator with a high speed inclined section, wherein when axes of the adjacent step link roller shafts are in the upper speed changing section, and, assuming that relative coordinates in horizontal and vertical directions of the axes of the step link roller shafts are (X
S
, Y
S
), that radius of curvature of movement locus of the axis of the step link roller shaft in the upper curved secti

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