Page 2.   SD Enthusiasts' Club Newsletter - Summer 2020.


SD FREIGHTERS FOR COMMERCIAL WORK.

Part 5. Chassis Details.

 

This part of the series based on a photo copy of a brochure, believed to be from around 1926, concentrates on the chassis and as previously there are additions to the text which are shown in italics. The photo is also an addition although a similar photo appears later in the brochure.


Standard Chassis Sizes.

Freighters can be supplied for varying loads, and in order to ensure the correct distribution of weight, it is essential to vary the wheelbase for a given body length, with the load on the chassis frame. In the table which follows, this is referred to as the frame load, and includes the weight of the body. The chassis to be chosen for given nett load depends on this factor, which is always considered when submitting a quotation.

                The chassis to carry frame loads of 70 cwts.  and 80 cwts. are always fitted with wide wheels and twin tyres to the rear axle, those of smaller capacity may have twin tyres if these are required. The radii given are measured to the outside of the front wheel.


                  Frame Loads and Body Lengths.

Wheel-

Base

Turning

Radius

50 cwt.

60 cwt.

70 cwt.

80 cwt.

Ft.  in.

6    0

Ft.  in.

10   3

Ft.  in.

9     0

Ft.  in.

10   0

Ft.  in.

   -

Ft.  in.

   -

6    6

11   0

10   0

10   6

11   0

11   6

7    3

12   4

11   0

12   0

12   0

1 3  0

8    0

13   8

12   0

1 3  0

1 3  0

14   0

8    9

15   0

1 3  0

14   0

14   0

15   0

9    6

16   4

14   0

15   0

15   6

16   0

10   3

17   8

15   0

16   0

17   0

17   0

11   0

19   0

16   0

17   0

18   0

18   6

11   9

20   4

17   0

18   0

19   0

20   0

12   6

21    8

18   0

19   0

20   0

   -

1 3  3

23  0

19   0

20   0

   -

   -

 

Chassis details

Canopy. The standard canopy or driver’s cab has a roof built of ash ribs, over which are fixed tongued ad grooved pine slats, varnished inside and covered outside with canvas impregnated with white lead, supported on four steel uprights. Side and back curtains of waterproof canvas can be rolled up when not required. The windscreen is of glass, in two panels. If required, a metal windscreen and rain-guard can be supplied instead of the glass windscreen. An all timber driver’s cab can also be fitted.

Tipping Gear. The tipping gear is of our own manufacture and is hydraulically operated, the pump being driven from the gearbox. A full tipping angle of over 90 degs. can be obtained in less than two minutes. Tipping gear can be fitted to Freighters with bodies up to 12 ft. long, with frame loads not exceeding 60 cwts. A brief Specification is as follows:-

Pump. Manganese bronze integral with Freighter gearbox.

No parts working except when required. All  working parts of steel hardened and ground where necessary. Controlled by a simple lever within the cab.

Oil reservoir. Consists of a welded steel tank attached to the back of the engine housing ; readily accessible for refilling.

Control Valve. Casing of gunmetal, valves of steel hardened and ground. Control lever placed in driver’s cab, giving three positions :- “up”, ”stop” and “down”. Automatic stop shuts valve when maximum tipping is reached.

Ram Gear. Telescopic ram, situated below the body and carried on trunnion brackets supported upon the chassis. No possibility of side strain upon the ram : ram packing leathers are very accessible and quickly replaced. The ram propels the body radially above pivots fixed to the chassis frame.

 Side Tipping. Side tipping gear can also be fitted, the general specification of this being the same, but twin rams are used instead of the single ram. This equipment is not frequently called for, as the great manoeuvring capacity of the Freighter makes the end-tipping vehicle suitable for almost all work.

Twin Tyres. As mentioned earlier, these are always fitted to the heavier models. When carrying loads of about two tons, it is sometimes useful to fit one tyre plain and one grooved to each wheel. This gives very good adhesion when working on soft ground or slippery road surfaces.

Electric Lighting. Either 6 or 12 volt electric lighting can be fitted instead of the oil lamps which are included in the standard chassis price. The standard electric lighting set comprises combined head and side lamps, tail lamp, switchbox, battery, and all necessary wiring.

Instruments. Mileometers or other recording instruments can be fitted when required.

 



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