Friction liner and traction sheave

Patent metadata

Field	Value
Publication number	US-10766746-B2
Application number	US-201816104568-A
Country	US
Kind code	B2
Filing date	Aug 17, 2018
Priority date	Aug 17, 2018
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

Disclosed is a liner for a traction sheave including a top surface and a bottom surface mutually spaced on a height-wise axis (H), a front surface and a back surface mutually spaced on lengthwise axis (L), and a plurality of side surfaces including a first side surface and a second side surface mutually spaced in a widthwise axis (W), wherein in a first cross sectional profile of the plurality of side surfaces forms convergent-divergent profile.

First claim

What is claimed is:

1. A liner for a traction sheave comprising:
a top surface and a bottom surface mutually spaced on a height-wise axis (H);
a front surface and a back surface mutually spaced on lengthwise axis (L); and
a plurality of side surfaces including a first side surface and a second side surface mutually spaced in a widthwise axis (W),
wherein:
in a first cross sectional profile of the liner, defined by the plurality of side surfaces, forms convergent-divergent profile, such that:
the first cross sectional profile includes a first neck portion intermediate of the top and bottom surfaces, whereat the liner is widthwise narrowest;
a top portion of the liner is height-wise above the first neck portion and a bottom portion of the liner is height-wise below the first neck portion;
in the top portion of the liner, the plurality of side surfaces converge between the top surface and the first neck portion; and the top surface of the liner comprises a concave profile; and
in the bottom portion of the liner, the plurality of side surfaces diverge between the first neck portion and the bottom surface; and

a first groove is formed as a protrusion in the bottom portion of the liner,
wherein the first groove extends height-wise upwardly from the bottom surface of the liner, partially through the liner, to a location height-wise below a bottom of the concave profile of the top surface, intermediate of widthwise ends of the bottom surface, whereby the bottom portion of the liner is configured to compress when press fit into the traction sheave; and

the bottom surface extends only along the widthwise direction from the first groove and toward the widthwise ends of the bottom surface.

2. The liner of claim 1 wherein
the first profile is symmetric about the height-wise axis.

3. The liner of claim 1 wherein
the first profile is constant along a lengthwise span of the liner.

4. The liner of claim 1 wherein
the concave profile is a semicircular profile.

5. The liner of claim 1 wherein
the first neck portion is height-wise below a bottom of the semicircular profile.

6. The liner of claim 1 wherein
a height-wise top of the liner has a first widthwise span,
a height-wise bottom has a second widthwise span, and
the first widthwise span is greater than the second widthwise span.

7. The liner of claim 1 wherein
the liner is widthwise resiliently flexible in the bottom portion.

8. A system comprising
a traction sheave and the liner of claim 1 wherein
the traction sheave comprises a cavity having a same height-wise span as the liner,
the cavity comprising a plurality of side surfaces having a second profile that is complementary to the first profile wherein the liner comprises a nominal clearance fit when seated within the cavity.

9. The system of claim 8 wherein
the cavity includes a second neck and
wherein the bottom of the liner comprises a press fit against the second neck.

10. The system of claim 9 wherein
the bottom of the liner widthwise compresses when being press fit through the second neck.

11. The system of claim 8 wherein
when seating the liner in the cavity,
the liner is urged in a height-wise downward direction from a top opening of the cavity until the first bottom surface of the liner is proximate a second bottom surface of the cavity.

12. The system of claim 8 wherein
when seating the liner in the cavity:
(i) the lengthwise span of the liner approximates a circumferential span of the traction sheave and the liner is seated in the traction sheave as a single piece; or
(ii) the lengthwise span of the liner is greater than the circumferential span of the traction sheave and the liner is seated in the traction sheave as a single piece and trimmed during seating to a length that approximates the circumferential span of the traction sheave; or
(iii) the lengthwise span of the liner is less than the circumferential span of the traction sheave and a plurality of liners are seated in the traction sheave.

Assignees

• Otis Elevator Co

Inventors

• Hubbard James L
• Torlai David R
• Keyo Peter

Classifications

• B66B15/04 Primary

  Friction sheaves; "Koepe" pulleys · CPC title

• B66B7/02 Primary

  Guideways; Guides (arrangements in mine shafts E21D7/02) · CPC title