# US 7,743,711 B2 · Deformable drive sheave

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- Number: US 7,743,711 B2
- Document ID: US7743711B2
- Status: Granted
- Kind: B2
- Application number: 11/670,789
- Filed: 2007-02-02
- Published: 2007-10-04
- Granted: 2010-06-29
- Earliest claimed: 2006-03-08
- Assignees: Leitner-Poma of America, Inc.
- Inventors: Jean-Francois Mugnier
- Web page: https://patentgrep.com/patent/US7743711B2

## CPC

- B61B 12/105: {Acceleration devices or deceleration devices other than braking devices}
- B61B 5/025: {Sub-floor conveyor systems, e.g. where the vehicle is above the ground and where the running gear and the propulsion device are located underground or in a tube. (tunnel systems: B61B13/10; funiculas systems B61B9/00)}
- B61B: RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR (lifts or hoists, elevators, escalators, moving walkways B66B)

## Abstract

A drive sheave equipped with a deformable tire is disclosed herein. An embodiment of the drive sheave comprises a tire portion wherein the tire portion comprises an inner circumferential surface and an outer circumferential surface. The tire portion also comprises a first surface extending between the inner circumferential surface and the outer circumferential surface. In addition, the tire portion comprises a second surface extending between the inner circumferential surface and the outer circumferential surface, wherein the second surface is oppositely disposed relative to the first surface. At least one opening in the tire portion extends between the first surface and the second surface.

## Claims

### Claim 1

A tramway comprising:
a rope extending between a first terminal and a second terminal, said rope being movable at a first velocity;
at least one carrier being connectable to said rope;
a track located in said first terminal, wherein said track comprises a first drive sheave operable at a first velocity and a second drive sheave operable at a second velocity;
a disengagement mechanism to release said at least one carrier from said rope, wherein a portion of said at least one carrier is contactable with said first drive sheave when said at least one carrier is released from said rope;
said first drive sheave and said second drive sheave comprising:
a tire portion;
said tire portion comprising an inner circumferential surface and an outer circumferential surface;
said tire portion comprising a first surface extending between said inner circumferential surface and said outer circumferential surface;
said tire portion comprising a second surface extending between said inner circumferential surface and said outer circumferential surface, said second surface being oppositely disposed relative to said first surface;
at least one opening in said tire portion extending through said first surface and said second surface.

### Claim 2 (depends on 1)

The tramway of claim 1, wherein said opening is elongated.

### Claim 3 (depends on 2)

The tramway of claim 2, wherein the elongated opening extends at an angle from a radius of said drive sheave, said radius extending from the center of said drive sheave, and wherein said elongated opening extends from proximate said inner circumferential surface toward said outer circumferential surface in the direction that said tire is rotatable.

### Claim 4 (depends on 3)

The tramway of claim 3, wherein said angle increases when said tire exerts a force associated with accelerating said at least one carrier.

### Claim 5 (depends on 3)

The tramway of claim 3, wherein said angle decreases when said at least one carrier moves faster than the drive sheave associated with said tire.

### Claim 6 (depends on 3)

The tramway of claim 3, wherein said angle is approximately twenty-three degrees.

### Claim 7 (depends on 1)

The tramway of claim 1, wherein said tire portion is pliable.

### Claim 8 (depends on 1)

The tramway of claim 1, wherein said first drive sheave is operable at a different velocity than said second drive sheave.

### Claim 9 (depends on 1)

The tramway of claim 1, wherein said first drive sheave is operable at a second velocity, said second velocity being substantially the same as said first velocity.

### Claim 10 (depends on 1)

The tramway of claim 1, wherein said first drive sheave is operable at a second velocity, said second velocity being different than said first velocity.

### Claim 11 (depends on 1)

The tramway of claim 1, wherein said portion of said at least one carrier is contactable with said first drive sheave and said second drive sheave when said at least one carrier is released from said rope.

### Claim 12 (depends on 1)

The tramway of claim 1 and further comprising a third drive sheave, wherein said portion of said at least one carrier is contactable with two of said drive sheaves when said at least one carrier is released from said rope.