(MOC) Early Mobile Crane circa 1923

[doug72]

(MOC) Worlds first mobile crane was built by Ransome & Rapier - Ipswich, England

kevin-real by Doug Ridgway, on Flickr

My MOC

IMG_2996 by Doug Ridgway, on Flickr

My representation of an early mobile crane, designed and built by Ransomes & Rapier - Ipswich England.

These versatile mobile petrol-electric cranes first made their debut in England 1923.

This crane also features as Kevin in the Thomas the Tank Engine books and films.

For more information and a video of a restored crane in action see:-

http://www.pegnsean....eries/kevin.htm

I have replicated all the crane functions with the structure as close as possible using Lego Technic and power functions.

IMG_2996 by Doug Ridgway, on Flickr

IMG_3002 by Doug Ridgway, on Flickr

The model has four functions:-

1/ Drive - M motor

2/. Steering - M motor

3/. Hoisting - L motor

4/. Jib up/down - M motor

The two PF Receivers are located where the petrol engine drove the dynamo for the four electric motors

Steering and drive are contained on the rear pair of wheels and uses castor steering using a turntable driven by a worm gear.

First build used a Z56 turntable but later decided to make the drivers steering wheel rotate at the same time, which meant a rebuild using the Z60 turntable so that a 12T double bevel gear could be used to achieve this.

The actual crane had no power steering - so it took a lot of effort to manually steer.

The drive is passed down through the turntable to a differential to drive both wheels.

The model uses three Efferman 3 x 3 x 3 worm gear box units which allow for a more compact build.

Hoisting and jib up/down is via two rope drums.

IMG_2997 by Doug Ridgway, on Flickr

Underside

IMG_3000 by Doug Ridgway, on Flickr

Motor compartment

Lower left M motor - steering, via 288:1 reduction

Lower right M motor - drive to the rear wheels via 11.2:1 reduction.

Upper right M motor Jib rope drum via 8;1 reduction and 4 fold rope purchase.

Hoist L motor can just be seen in upper left of photo 8:1 reduction.

IMG_3001 by Doug Ridgway, on Flickr

Rear view of steering / drive unit which can rotate through 360 degs. in either direction.

IMG_2998 by Doug Ridgway, on Flickr

With wheels turned

IMG_2999 by Doug Ridgway, on Flickr

A video showing this model in action will be posted later.

Edited January 7, 2016 by Doug72

[doug72]

Video of my MOC in action, excuse the poor driving its quite hard getting use to steering it as for each 180 deg. rotation of the steering unit the drive goes the other way.

If not try this:

Edited January 7, 2016 by Doug72

[KirTech LAB]

Excellent model! Very interesting functions!

[nerdsforprez]

novel idea. I like it when people think out of the box for MOC ideas. Well done...