Wedge clamp type termination for elevator tension member

Patent metadata

Field	Value
Publication number	US-RE47035-E
Application number	US-80549004-A
Country	US
Kind code	E1
Filing date	Mar 19, 2004
Priority date	Dec 31, 1998
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

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.

First claim

What is claimed is:

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)).

2. A method for terminating a tension member having a width W and an elastomer coating that has a maximum compressive stress capability σ 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)).

3. A method according to claim 2 further comprising:
positioning the tension member in a back-to-back arrangement;
placing a pair of plates on either side of the tension member;
inserting a plurality of fasteners through the plates;
tightening the fasteners; and
clamping the tension member between the plates in a double overlap arrangement.

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)).

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)).

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 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)).

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)).

Assignees

• Ericson Richard J
• Rehmer Dennis J
• Baranda Pedro
• Otis Elevator Co

Inventors

• Ericson Richard J
• Rehmer Dennis J
• Baranda Pedro

Classifications

• Y10T24/3969

  Sliding part or wedge · CPC title

• B66B7/062 Primary

  Belts · CPC title

• B66B7/085 Primary

  Belt termination devices · CPC title

• F16G11/04

  with wedging action, e.g. friction clamps (F16G11/02, {F16G11/10} take precedence; {eyes for grommet-thimble type fastenings F16G11/146}) · CPC title

• B66B7/08 Primary

  for connection to the cars or cages, e.g. couplings · CPC title