Wedge clamp type termination for elevator tension member
First Claim
Patent Images
1. A termination device for a tension member, the tension member having a width W and an elastomer coating that has a maximum compressive stress capability σ
-
c, the tension member being subjected to a tensile force T, the termination device comprising;
a socket; and
a wedge that fits within the socket with the tension member wrapped around the wedge, the wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured from a centerline of the wedge to the clamping surface and which relates to the length L in accordance with the formula defining a minimum of the angle ϕ
;
ϕ
≥
tan−
1 ϕ
=tan−
1(T/(σ
c*L*W)).
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Abstract
A tension member termination device optimized for terminating flat tension members having compressible outer coatings, the device including a wedge and a socket each having cooperating surfaces positioned at a predetermined angle for clamping the tension member therebetween. The angle reliably secures the tension member while avoiding deleterious pressure and stress upon the tension member. The invention also provides a safety clamp for optional use with the tension member termination device.
20 Citations
7 Claims
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1. A termination device for a tension member, the tension member having a width W and an elastomer coating that has a maximum compressive stress capability σ
-
c, the tension member being subjected to a tensile force T, the termination device comprising;
a socket; and a wedge that fits within the socket with the tension member wrapped around the wedge, the wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured from a centerline of the wedge to the clamping surface and which relates to the length L in accordance with the formula defining a minimum of the angle ϕ
;
ϕ
≥
tan−
1 ϕ
=tan−
1(T/(σ
c*L*W)).
-
c, the tension member being subjected to a tensile force T, the termination device comprising;
-
2. A method for terminating a tension member having a width W and an elastomer coating that has a maximum compressive stress capability σ
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c, comprising;
feeding the tension member into an aperture of a socket; wrapping the tension member around a wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured from a centerline of the wedge to the clamping surface;feeding the tension member back through the aperture; and applying a tensile force T in the tension member so that the tension member is compressed between the wedge and the socket, wherein the tensile force T is applied in accordance with the formula defining a minimum of the angle ϕ
;
ϕ
≥
tan−
1 ϕ
=tan−
1(T/(σ
c*L*W)). - View Dependent Claims (3)
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c, comprising;
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4. A termination device for a tension member, the tension member having a width W and a compressible coating that has a predetermined maximum compressive stress capability σ
-
c, the compressible coating being subject to compressive creep, the tension member being subjected to a tensile force T, the termination device comprising;
a socket; and a wedge that fits within the socket with the tension member wrapped around the wedge, the wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured from a centerline of the wedge to the clamping surface and which relates to the length L in accordance with the formula defining a minimum of the angle ϕ
;
ϕ
=tan−
1(T/(σ
c*L*W)).
-
c, the compressible coating being subject to compressive creep, the tension member being subjected to a tensile force T, the termination device comprising;
-
5. A method for terminating a tension member having a width W and a compressible coating that has a predetermined maximum compressive stress capability σ
-
c, the compressible coating being subject to compressive creep, the method comprising;
feeding the tension member into an aperture of a socket; wrapping the tension member around a wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured between a centerline of the wedge and the clamping surface;feeding the tension member back through the aperture; and applying a tensile force T in the tension member so that the tension member is compressed between the wedge and the socket, wherein the tensile force T is applied in accordance with the formula defining a minimum of the angle ϕ
;
ϕ
=tan−
1(T/(σ
c*L*W)).
-
c, the compressible coating being subject to compressive creep, the method comprising;
-
6. A termination device for a tension member, the tension member having a width W and comprised of a plurality of inner load carrying cords and a compressible coating, wherein the compressible coating defines a traction surface for the tension member and the compressible coating has a predetermined maximum compressive stress capability σ
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c, the compressible coating being subject to compressive creep if the maximum compressive stress capability is exceeded, the tension member being subjected to a tensile force T, the termination device comprising;
a socket; and a wedge that fits within the socket with the tension member wrapped around the wedge, the wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured between a centerline of the wedge and the clamping surface and which relates to the length L in accordance with the formula that defines a minimum of the angle ϕ
;
ϕ
=tan−
1(T/(σ
c*L*W)).
-
c, the compressible coating being subject to compressive creep if the maximum compressive stress capability is exceeded, the tension member being subjected to a tensile force T, the termination device comprising;
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7. A method for terminating a tension member having a width W and comprised of a plurality of inner load carrying cords and a compressible coating, wherein the compressible coating defines a traction surface for the tension member and has a predetermined maximum compressive stress capability σ
-
c, the compressible coating being subject to compressive creep if the predetermined maximum compressive stress capability is exceeded, the method comprising;
feeding the tension member into an aperture of a socket; wrapping the tension member around a wedge having a clamping surface that includes a length L and is disposed at an angle ϕ
, which is measured between a centerline of the wedge and the clamping surface;feeding the tension member back through the aperture; and
applying a tensile force T in the tension member so that the tension member is compressed between the wedge and the socket, wherein the tensile force T is applied in accordance with the formula that defines a minimum of the angle ϕ
;
ϕ
=tan−
1(T/(σ
c*L*W)).
-
c, the compressible coating being subject to compressive creep if the predetermined maximum compressive stress capability is exceeded, the method comprising;
Specification