contractors plant
PIPE BENDER
Manually-operated tool bends in. steel pipes
STEEL water and steam pipes, from % to 14 in. in diameter, can be bent to angles in excess of 90 deg. using the Express manual pipe ben- der. Made in Denmark, it is operated by a tommy bar at the end of a screw piston.
The basic mechanism of the tool takes the form of a flat, crescent- shaped metal baseplate with, at the top of the crescent, a solid metal block through which the piston is threaded.
Express pipe bender
Two guide blocks, one on each side of the piston, can be set in any one of four pairs of pre-drilled holes (depending on the bending angle re- quired) to support the pipe under pressure, while any one of five curved formers can be fitted on the end of the piston, according to the diameter of the pipe to be bent.
After the guides have been located,
the appropriate former attached and the piston and pipe placed in posi- tion, the operator has only to bring a hinged metal plate down over the as- sembly and manipulate the screw- piston tommy bar. The pressure of this action locks the top plate to the rest of the mechanism and forces the pipe against the guides, bending it to the required angle.
Ambrose Powell Group, 14 Sir Isaac's Walk, Colchester, Essex, UK, concessionaires for the equipment, are interested in contacting agents in S.E. Asia.
TRENCHER
Hydrostatic drive and automatic steering
AN 18 h.p. air-cooled, petrol engine powers the model RL Trench Devil, a combination tractor/trencher produc- ed by the Arps Corporation, New Holstein, Wis., USA.
Hydrostatic tractor drive provides infinite control of three speeds forward and reverse, with road travel up to 6 m.p.h. Steering is conventional automotive-type through the front wheels. However when the operator removes his hands from the steering wheel, the steering train automatically locks for either curved or straight line travel when trenching.
The hydraulically-driven trencher provides an infinite range of digging speeds. It is capable of digging from 4 in. to 14 in. wide, and up to 58 in. deep, depending upon which of four different length digging booms are used and the width of the trench. "Slicer" style cutters are standard,
with chisel cutters available for digging in extremely hard ground. Continuous spoil delivery to the right of the machine is provided by a heavy-duty, broad-bladed auger.
Half-tracks are said to give the unit the stability and traction advantages of track-type crawlers without impair- ing the steering and handling ease of the wheel tractor. Mounted around the rear drive wheels and idler wheels, they are easily removed for trenching in areas where traction is no problem.
Optional equipment for the basic tractor includes a front-mounted, 48 in. wide bulldozer blade which may be set at three different angles and has hydraulic lift and down pressure, and a front-mounted hydraulic boring at- tachment.
EXCAVATOR
Two levers control digging cycle
A NEW 8 cu. yd. fully hydraulic wheel-mounted digger, the Mustang 90, by Priestman Brothers Ltd., Kingston upon Hull, UK, has a hydrostatic transmission system which provides a maximum speed of 12 m.p.h. in either forward or reverse.
There are four 'super wide' single wheels fitted with tubeless tyres hav- ing a deep section tread which cleans itself of mud and stones and provides a firm grip on churned up sites. Only one pedal is used to control accelera- tion and braking; the digging cycle is carried out through two levers each of which controls four operations. Different lengths of boom and bucket arm can be used to achieve three alternative combinations.
The Mustang 90 can dig down to 19 ft. 6 in. or discharge at a height of 18 ft. 2 in. Buckets from 13 in. to 72 in. wide, and equipments such as back hoes, hydraulic grabs and silt buckets are available.
Two vane type pumps supply hydraulic fluid to the system at a maximum pressure of 2,500 p.s.i. from a 65 gallon oil reservoir. A cooler fitted in front of the engine radiator cools the oil even at maximum flow. Power for all func- tions is provided by a 6-cylinder
RL Trench Devil tractor/trencher
Priestman Mustang 90 excavator
Far East BUILDER, June 1968.
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