trolley wheel

Simon's trolley wheels bumped over a small ridge on the floor.

They used an explosive charge to knock out the trolley wheels that the cable car rides on.

For this reason, the pole was tipped with a metal plate rather than a shoe or trolley wheel.

At the end of the experiments, ordinary swivel trolley wheels were refitted.

Curiously, Philadelphia did not convert its trolley wheels on its remaining streetcars until 1978.

The only sounds were the quiet squeakings of the trolley wheels, and the occasional muttering of voices.

'He's only got a choice of two,' said Windle, throwing the trolley wheels across the floor.

The terms trolley pole and trolley wheel both derive from the troller.

Modern trolleys often use a metal shoe with a carbon insert instead of a trolley wheel, or have a pantograph (rail).

While the Dunnock's bubbling song is very pleasant, it has been described as being similar to a squeaky trolley wheel.

Traditionally the tram has drawn its power through a phosphor-bronze trolley wheel mounted over the end of a trolley arm.

The Love system transmitted electricity through a set of trolley wheels running on underground conduit rails instead of through the sliding shoe used elsewhere.

Some of the accessories, such as trolley wheels and axles and woven cane seats, were built by local craftsmen and delivered complete.

Although a streetcar with a trolley wheel may evoke an antique look, the trolley shoe is modern and more practical as well as economical.

In the extreme case of the shopping trolley wheel, the system is undamped but stable, as the wheel oscillates around the 'correct' path.

Sister," said Mr Grenfell, and waited while curtains were drawn, the trolley wheeled nearer and the patient got ready.

I guessed that it was pulling a train of empty tubs, for there was a metallic rattling as the trolley wheels bounced on the poorly made track.

The pole sits atop a sprung base on the roof of the vehicle, with springs providing the pressure to keep the trolley wheel or shoe in contact with the wire.

In 2012, the museum adopted a cat, called Frank the Trolley Cat, after Frank J. Sprague, the inventor of the trolley wheel.

Behind the mule, an ancient charging engine stood on a board fitted with trolley wheels, presumably so that it could be easily moved out of the cave when running to recharge the batteries.

The grooved trolley wheel was used on many large city systems through the 1940s and 1950s; it was generally used on systems with "old" style round cross sectional overhead wire.

It may have been the noise too; the hotel was alive with the sound of trolleys wheeled down corridors, plumbing in adjacent rooms as occupants peed and washed, the obsequious knocks of room-service waiters.

Experiments were tried in fitting carbon skids for current collection instead of trolley wheels, and five cars were experimentally fitted: these were reputed to be nos. 74, 121, 136, 147 and 160; the last three definitely had skids.

The trolley wheel was problematic at best; the circumferential contact of the grooved wheel bearing on the underside of the overhead wire provided minimal electrical contact and tended to arc excessively, increasing overhead wire wear .

The first successful electric streetcars in the United States used a system devised by Frank J. Sprague, in which a spring-loaded trolley pole pushed a small trolley wheel up against an overhead wire to collect electricity for the motors.