General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

ALL METAL CONSTRUCTION, SAVE SYNTHETIC TOOTHED WHEELS AND RUBBER (?) PADS.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

11.0 cm

Width

5.5 cm

Height

14.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Non-motorized Ground Transportation

Category

Cycles & cycling

Sub-Category

N/A

Manufacturer

AKA

SHIMANO

Country

Japan

State/Province

Unknown

City

Unknown

Context

Country

North America

State/Province

Unknown

Period

THIS MODEL OF DERAILLEUR USED MID-1970S, AND POSSIBLY LATER.

Canada

EXAMPLE OF A BICYCLE DERAILLEUR TYPE USED IN CANADA.

Function

USED TO LEAD BICYCLE CHAIN FROM ONE SPROCKET TO ANOTHER DURING GEAR SHIFTING.

Technical

BOTH FRONT & REAR DERAILLEURS WORK BY PUSHING THE BICYCLE CHAIN SIDEWAYS, SO THAT IT RUNS AT AN ANGLE ONTO THE SPROCKET, INSTEAD OF STRAIGHT. WHEN THE ANGLE BECOMES SHARP ENOUGH, THE CHAIN CAN NO LONGER MESH WITH THE SPROCKET, FALLS OFF AND LANDS ONTO THE NEXT SPROCKET IN LINE. WHEN SHIFTING FROM A SMALLER SPROCKET TO A LARGER ONE, THE CHAIN IS FORCED TO RUB AGAINST THE SIDE OF THE LARGER SPROCKET NEXT TO THE ONE IT IS RIDING ON. EVENTUALLY IT IS SNAGGED ON THE SIDES OF THE TEETH OF THE LARGER SPROCKET, AND PULLED ON. (REF. 1)

Area Notes

Unknown

Details

Markings

"SHIMANO" incised in derailleur mounting, at top. "POSITRON/ SHIMANO" incised in casing near height adjustment mechanism; "3" incised on adjustment scale. "SHIMANO/PAT. PENDING" incised on body. "CENTER" and "ADJUST" appear in raised print on pad surrounding adjustment screw. "SHIMANO/ PRODUCT OF JAPAN" incised on underside. "AE" & "3" also incised on casing. "SHIMANO" cast in raised print on each of toothed wheels.

Missing

APPEARS COMPLETE.

Finish

SILVER METAL; BLACK MOULDED WHEELS; DARK BROWN PADS.

Decoration

N/A