This paper proposes a foldable stair that is easily deployed for use and folded for storage. It consists of a number of identical deployable scissor-like elements which form the staircases when expanded. In addition to use, the folded stair can be used for hanging clothes and acting as a decoration. The mechanism of the stair is first synthesized in line with the common stairs between two horizontal levels. The actuating mechanism is then synthesized in accordance with two extreme positions of the stair, folded, and unfolded. Because the stair can be folded after use, it is convenient in use and will witness a wide application both indoors and outdoors where there is no enough space for a fixed stair. In addition, this deployable stair is also particularly useful in evacuating people from a building when the disasters such as earthquakes occur.

References

References
1.
Kaveht
,
A.
, and
Davaranl
,
A.
, 1996, “
Analysis of Pantograph Foldable Structures
,”
Comput. Struct.
,
59
(
1
), pp.
131
140
.
2.
Escrig
,
F.
, and
Valcarcel
,
P.
, 1996, “
Geometry of Expandable Space Structures
,”
Int. J. Space Struct.
,
11
(
1
), pp.
257
274
.
3.
Chen
,
Y.
,
You
,
Z.
, and
Tarnai
,
T.
, 2005, “
Threefold-Symmetric Bricard Linkages for Deployable Structures
,”
Int. J. Solids Struct.
,
42
(
8
), pp.
2287
2301
.
4.
Chen
,
W -.J.
,
Luo
,
Y.-Z.
,
Fu
,
G.-Y.
, and
Dong
,
S.-L.
, 2001, “
A Study on Space Masts Based on Octahedral Truss Family
,”
Int. J. Space Struct.
,
16
(
1
), pp.
75
81
.
5.
You
,
Z.
, and
Pellegrino
,
S.
, 1997, “
Foldable Bar Structures
,”
Int. J. Solids Struct.
,
34
(
15
), pp.
1825
1847
.
6.
Dai
,
J. S.
, and
Jones
,
J. R.
, 1999, “
Mobility in Metamorphic Mechanisms of Foldable/Erectable Kinds
,”
Trans. ASME J. Mech. Des.
,
121
(
3
), pp.
375
382
.
7.
Gantes
,
C.
,
Giakoumakis
,
A.
, and
Vousvounis
,
P.
, 1997, “
Symbolic Manipulation as a Tool for Design of Deployable Domes
,”
Comput. Struct.
,
64
(
1–4
), pp.
865
878
.
8.
Chen
,
Y.
, and
You
,
Z.
, 2009, “
Two-Fold Symmetrical 6R Foldable Frame and Its Bifurcations
,”
Int. J. Solids Struct.
,
46
(
25–26
), pp.
4504
4514
.
9.
Nagaraj
,
B. P.
,
Pandiyan
,
R.
, and
Ghosal
,
A.
, 2009, “
Kinematics of Pantograph Masts
,”
Mech. Mach. Theory
,
44
(
4
), pp.
822
834
.
10.
Langbecker
,
T.
, 1999, “
Kinematic Analysis of Deployable Scissor Structures
,”
Int. J. Space Struct.
,
14
(
1
), pp.
1
15
.
11.
Wei
,
G.
,
Ding
,
X.
, and
Dai
,
J. S.
, 2010, “
Mobility and Geometric Analysis of the Hoberman Switch-Pitch Ball and Its Variant
,”
Trans. ASME J. Mech. Rob.
,
2
,
031010
.
12.
Nagaraj
,
B. P.
,
Pandiyan
,
R.
, and
Ghosal
,
A.
, 2010, “
A Constraint Jacobian Based Approach for Static Analysis of Pantograph Masts
,”
Comput. Struct.
,
88
(
1–2
), pp.
95
104
.
13.
Hanaor
,
A.
, and
Levy
,
R.
, 2001, “
Evaluation of Deployable Structures for Space Enclosures
,”
Int. J. Space Struct.
,
16
(
4
), pp.
211
229
.
14.
Mirats Tur
,
J. M.
, and
Juan
,
S. H.
, 2008, “
Tensegrity Frameworks: Static Analysis Review
,”
Mech. Mach. Theory
,
43
(
7
), pp.
859
881
.
15.
Mirats Tur
,
J. M.
, and
Juan
,
S. H.
, 2009, “
Tensegrity Frameworks: Dynamic Analysis Review and Open Problems
,”
Mech. Mach. Theory
,
44
(
1
), pp.
1
18
.
16.
Gan
,
W. W.
, and
Pellegrino
,
S.
, 2006, “
Numerical Approach to the Kinematic Analysis of Deployable Structures Forming a Closed Loop
,”
Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci.
,
220
(
7
), pp.
1045
1056
.
17.
Xu
,
L. J.
,
Tian
,
G. Y.
,
Duan
,
Y.
, and
Yang
,
S. X.
, 2001, “
Inverse Kinematic Analysis for Triple-Octahedron Variable-Geometry Truss Manipulators
,”
Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci.
,
215
(
2
), pp.
247
251
.
18.
Chen
,
Y.
, and
You
,
Z.
, 2007, “
Spatial 6R Linkages Based on the Combination of Two Goldberg 5R Linkages
,”
Mech. Mach. Theory
,
42
(
11
), pp.
1484
1489
.
19.
Wohlhart
,
K.
, 1991, “
Merging Two General Goldberg 5R Linkages to Obtain a New 6R Space Mechanism
,”
Mech. Mach. Theory
,
26
(
7
), pp.
659
668
.
20.
Liu
,
S. Y.
, and
Chen
,
Y.
, 2009, “
Myard Linkage and Its Mobile Assemblies
,”
Mech. Mach. Theory
,
44
(
10
), pp.
1950
1963
.
21.
Shigley
,
J. E.
, and
Uicher
,
J. J.
, 1980,
Theory of Machines and Mechanisms
,
McGraw-Hill Companies, Inc.
,
New York
.
22.
Rosenfeld
,
Y.
, and
Logcher
,
R. D.
, 1988, “
New Concepts for Deployable Collapsable Structures
,”
Int. J. Space Struct.
,
3
(
1
), pp.
20
32
.
23.
Escrig
,
F.
,
Valcarcel
,
J. P.
, and
Sanchez
,
J.
, 1996, “
Deployable Cover on a Swimming Pool in Seville
,”
J. Int. Assoc. Shell Spatial Struct.
,
37
(
1
), pp.
39
70
.
24.
Zhao
,
J.-S.
,
Wang
,
J.-Y.
,
Chu
,
F.
,
Feng
Z.-J.
, and
Dai
,
J. S.
, 2011, “
Structure Synthesis and Statics Analysis of a Foldable Stair
,”
Mech. Mach. Theory
,
46
(
7
), pp.
998
1015
.
25.
Dai
,
J. S.
,
Li
,
D.
,
Zhang
,
Q. X.
, and
Jin
,
G. G.
, 2004, “
Mobility Analysis of a Complex Structured Ball Based on Mechanism Decomposition and Equivalent Screw System Analysis
,”
Mech. Mach. Theory
,
39
(
4
), pp.
445
458
.
26.
Zhao
,
J.-S.
,
Zhou
,
K.
, and
Feng
,
Z.-J.
, 2004, “
A Theory of Degrees of Freedom for Mechanisms
,”
Mech. Mach. Theory
,
39
(
6
), pp.
621
643
.
27.
Zhao
,
J.-S.
,
Feng
,
Z.-J.
,
Wang
,
L.-P.
, and
Dong
,
J.-X.
, 2006, “
The Free Mobility of a Parallel Manipulator
,”
Robotica
,
24
(
5
), pp.
635
641
.
28.
Zhao
,
J.-S.
,
Feng
,
Z.-J.
, and
Dong
,
J.-X.
, 2006, “
Computation of the Configuration Degree of Freedom of a Spatial Parallel Mechanism by Using Reciprocal Screw Theory
,”
Mech. Mach. Theory
,
41
(
12
), pp
1486
1504
.
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