Systems and methods for caster obstacle management

• US 8,910,344 B2
• Filed: 01/31/2011
• Issued: 12/16/2014
• Est. Priority Date: 04/07/2010
• Status: Active Grant

• Current Assignee: Alcon Incorporated
• Original Assignee: Alcon Research Limited (Nestle SA)
• Inventors: Nguyen, Long Q., Bauen, Daniel, Bair, Cassilyn, Davis, Lawrence E.
• Primary Examiner(s): MORGAN, EMILY M
• Application Number:
  US13/017,099
• Publication Number:
  US 20110247173A1
• Time in Patent Office: 1,415 Days
• Field of Search: 16/32, 16/34, 16/18.CG, 16/18.B
• US Class Current: 16/18.B
• CPC Class Codes: B60B 33/0042 Double or twin wheels
• CPC Class Codes: B60B 33/0049 the rolling axle being horizontal
• CPC Class Codes: B60B 33/0057 the rolling axle being offset from swivel axis
• CPC Class Codes: B60B 33/0068 the swivel axis being vertical
• CPC Class Codes: B60B 33/0073 the swivel axis being symmetrical to wheel or wheels
• CPC Class Codes: B60B 7/00 Wheel cover discs, rings, or the like, for ornamenting, protecting , venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall , e.g. wheel cover discs, wheel cover discs with cooling fins wheels with cooling fins not provided on the wheel cover disc B60B19/10; apparatus or tools for removing or attaching cover discs hub caps or the like B60B31/06
• CPC Class Codes: B60B 7/061 characterised by the part of the wheels to which the discs, rings or the like are mounted

Abstract

In various embodiments, a caster assembly may include a wheel rotatably coupled to a caster housing and a deflector tab pivotably coupled to the caster housing and offset from an outer wheel circumference for use in moving or traversing obstacles encountered during wheel movement. In some embodiments, the deflector tab may include at least one retaining element configured to hold the deflector tab in a pusher position or allow movement of the deflector tab into a ramp position. In the pusher position, the deflector tab may push a mobile obstacle in front of the wheel motion. In the ramp position, the deflector tab may facilitate moving the wheels over a fixed obstacle.

Claims

1. An apparatus, comprising:

a wheel rotatably coupled to a caster housing about a wheel axis, wherein the caster housing is rotatable about a caster pivot axis and wherein the wheel is offset from the caster pivot axis to swing around the caster pivot axis during wheel rotation such that the wheel trails the caster pivot axis in the direction of wheel movement;

a deflector tab having two ends, the deflector tab is pivotably coupled to the caster housing at a tab pivot point between the two ends, and one end at least partially extending beyond an outer wheel circumference, wherein the tab pivot point is located on a side of the caster pivot axis opposite the wheel axis, and is located below the wheel axis; and

a first magnet coupled to the deflector tab and a second magnet coupled to the caster housing;

wherein a magnetic pull between the first magnet and the second magnet is configured to be strong enough to hold the deflector tab in a pusher position when the deflector tab encounters a movable cable during wheel movement; and

wherein the magnetic pull between the first magnet and the second magnet is configured to be weak enough to allow movement of the first magnet relative to the second magnet to allow the deflector tab to move into a ramp position when the deflector tab is deflected by a relatively immobile obstacle during wheel movement.

2. The apparatus of claim 1, wherein the deflector tab is configured to push the movable cable in front of the wheel movement to prevent the movable cable from inhibiting wheel movement.

3. The apparatus of claim 1, wherein when the deflector tab is in the ramped position, the deflector tab is configured to allow the apparatus to be moved up a ramped surface, formed between the deflector tab and the relatively immobile obstacle, over the relatively immobile obstacle.

4. The apparatus of claim 1, further comprising a stub coupled to the caster housing configured to limit travel of the deflector tab when the deflector tab moves into the ramp position by abutting against a side of the deflector tab that is not in contact with the immobile obstacle.

5. The apparatus of claim 1, wherein the deflector tab further comprises a roller positioned on an outer surface of the deflector tab to engage the relatively immobile obstacle when the deflector tab is in the ramp position.

6. The apparatus of claim 1, wherein at least one of the first magnet and the second magnet is an electro-magnet.

7. The apparatus of claim 1, wherein the caster housing comprises an outer edge that is located in front of the wheel and above the tab pivot point during wheel movement.

8. The apparatus of claim 7, wherein the outer edge is parallel to a caster axis of the caster housing.