# US 5,702,117 A · Trolley intended for a medical apparatus and comprising wheels provided with a cable pusher

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- Number: US 5,702,117 A
- Document ID: US5702117A
- Status: Granted
- Kind: A
- Application number: 08/572,218
- Filed: 1995-12-13
- Granted: 1997-12-30
- Earliest claimed: 1994-12-19
- Assignees: U.S. Philips Corporation
- Inventors: Frans E. N. Geelhoed
- Web page: https://patentgrep.com/patent/US5702117A

## CPC

- A61B 6/4405: {the apparatus being movable or portable, e.g. handheld or mounted on a trolley}
- B60B 33/00: Castors in general {; Anti-clogging castors} (castors for large containers B65D90/18)
- B60B 33/0028: {Construction of wheels; methods of assembling on axle}
- B60B 33/0039: {Single wheels}
- B60B 33/0049: {the rolling axle being horizontal}
- B60B 33/0057: {the rolling axle being offset from swivel axis}
- B60B 33/0068: {the swivel axis being vertical}
- B60B 33/0073: {the swivel axis being symmetrical to wheel or wheels}
- B60B 2200/26: Medical appliances
- B60B 2200/43: Carts
- B62B 5/0006: {Bumpers; Safety devices}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M)

## Abstract

A trolley intended for a medical apparatus and comprising wheels for displacement on a floor surface. In order to push aside cables running on the floor of the working environment, the wheels are provided with a cable pusher having a pushing edge. The plate constituting the cable pusher is provided with approximately triangular cut-outs which receive stationary cams. If no external forces act on the plate, it is pressed onto the cams by springs in such a manner that the apex of the triangular cut-outs bears on the cams. The springs are proportioned so that an obstructing cable is pushed aside by the plate; however, when this plate comes into contact with a fixed obstacle, for example a threshold, the plate is pushed upwards. Damaging of the cable pusher is thus avoided and the risk of overturning of the trolley is reduced.

## Claims

### Claim 1

A trolley intended for a medical apparatus and comprising a base provided with wheels enabling displacement of the trolley on a floor surface, at least one of the wheels being provided with a cable pusher having a pushing edge situated a predetermined distance above the floor surface, characterized in that:
a) the cable pusher comprises a cut-out surface which extends perpendicularly to the shaft of the associated wheel and a boundary of which constitutes the pushing
b) in said cut-out surface there are provided cut-outs which receive a respective cam which is rigidly arranged relative to the wheel shaft, said cams being offset relative to one another, parallel to the floor surface,
c) each of said cut-outs comprises two boundaries which extend towards the floor surface,
d) the boundaries meet at the area of an equilibrium suspension point,
e) and resilient means are provided which press the cut-out surface with the cams in the equilibrium suspension points.

### Claim 2 (depends on 1)

A trolley as claimed in claim 1, characterized in that the cut-out surface is formed by a flat plate comprising mainly triangular cut-outs.

### Claim 3 (depends on 1)

A trolley as claimed in claim 1, characterized in that the cams are shaped as a cylinder and the equilibrium suspension points are shaped as an arc of circle of the same radius as the cylinder.

### Claim 4 (depends on 1)

A trolley as claimed in claim 1, characterized in that the boundaries which meet at the area of an equilibrium suspension point enclose an angle of at least 60.degree..

### Claim 5 (depends on 1)

A trolley as claimed in claim 1, characterized in that the resilient means are formed by two spring elements whose respective spring forces act in a direction from the respective cut-outs towards a point on the floor surface between the two cut-outs.