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HOW DO YOU VIEWP

15th November 1963
Page 93
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Page 93, 15th November 1963 — HOW DO YOU VIEWP
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n HE British climate being what it is—awful—windscreen wipers in this country come in for a great deal of wear. There are few days in the period October-April when they are not called upon to perform their very necessary function. It is Illy important that every driver should be certain that the wipers on his vehicle are perfect operating condition and it is in his interest that the type of wiper fitted add be the most suitable for that particular vehicle. Windscreen wiper units can y a good deal, but basically they fall into three main classes, being either electrically. yen, air-operated or vacuum-operated. Other common variables includes the type I length of arm to be fitted and the length of blade to be used. A review of wiper ts available as accessories in this country appears below.

Ltd. produces a WS1 wiper unit igned tc; meet the requirements of te screens. Both 12 V and 24 V veris of the wiper are supplied. Control the unit is by a separate switch tinted on the dashboard. The wiper t is attached to the vehicle by means

two U.N.F. studs, eliminating possibility of spindle distortion during tinting. The weight of the assembly, i lb., has been kept to a minimum by of light-alloy castings.

:urrent consumption of the 12 V ver is 3 A under average load and terniture conditions and consumption of 24 V unit is 1-5 A. The unit is for osed mounting at either the top or bottom of the screen and the arc of vement can be either 60", 90°, 120° or gearbox is mounted integrally with motor and blade arms are mounted :city on the output spindle. Only one le can be used with this motor and may vary in length from 12-18 in. des available are suitable for either or curved screens. List price of the 1 unit is 18 3s. plus switch, arm and le.

he tpe. DL2 wiper marketed by -V. is designed to drive two wiper les. The unit is supplied as a come assembly. comprising motor, linkage

spindle units, all mounted on a rigid inting plate. When the wiper unit is :ched on, rotary motion is transmitted n the motor armature to an output :4 carrying a small crank. The drive n the crank is transmitted to each of

spindle units by means of a mechanilinkage system. This can be designed hat the two blades have either similar lissimilar angles of wipe: these angles r vary from 90°-120° according to allation requirements. The DL2 wiper

is available for both 12 and 24 V systems and supressors may be fitted if required. For normal applications the maximum length of arms and blades is 14 in. The weight of this unit is 6.5 lb.

Joseph Lucas (Electrical) Ltd. supplies eight different windscreen wiper units. These models, known as the FW2, DR3, DR3A, 6W. 6WA, DL2, DL3 and DL3A, all have shunt-wound electric motors with geared-down output spindles and there are 6, 12 and 24V versions of each model. Details of the current consumption of the units are as follows:

• Control of the FW2 model is by motor or dashboard-mounted switch, with or without provision for hand parking and wiping. The other models are also operated by dashboard-mounted switches, but model DL2 and models with an A suffix have end-of-wiping-arc parking and the remaining models have " off-screen " parking.

The FW2. which is a one-blade wiper, is directly mounted and the motor is therefore usually exposed. The motor can be mounted either at the top or the bottom of the screen; the speed of this model is not variable and its wiping arc is from 90-150°. Linkage between the motor and blades is by crank, connecting the rod and oscillating sector gear in the motor gearbox with the blade fitted directly to the output spindle.

Models DR3, DR3A, 6W, 6WA, DL2, DL3 and DL3A usually have two blades, though three. may be supplied for wide, low screens. In practice, though, DR3 and DR3A installations are suitable for two blades only. All models, apart from the FW2 are designed to have the motor remotely mounted (usually under the bonnet). These seven units can operate at two speeds, or a rheostatic switch may be used so that speed may be variable.

The DR models have a wiping arc of 70-160'; on the 6WA, DL2 and DL3A the wiping arc is 90-120° and on the 6W and DL3 the wiping arc is 90-110° (plus 100 parking). All models apart from the 6W and 6WA can be mounted either at the top or the bottom of the screen. The 6W and 6WA units are for mounting at the bottom of the screen only.

The mechanism on the DR and 6W units is by cable rack in a metal tube to pinions on the wiper arm spindles. On the DL models the mechanism is by crank, oscillating links and connecting rods.

Blade lengths of the Lucas wipers vary from 6 to 18 in. They are made from moulded, or 5-ply (for fiat screens) treated rubber, carried in stainless or enamelled articulated harness for curved screens, or in rigid harness for flat screens. Length of wiper arms varies from 4-5 to 14 in.

Magnatex Ltd. manufactures vacuumoperated windscreen wiper motors in two sizes for vehicles having some form of boost for the vacuum at the engine air intake manifold. The smaller motor, the Magnatex 2XL, will operate one I4-in. blade or two 9-in, blades, whereas the larger unit. the Magnatcx 4XL, will operate one 20-in, blade or two 14-in. blades. Three blades 'may be worked from one motor provided blade length does not exceed 11 in. Stop and start switching is remote or direct and the motor may be either concealed or exposed. Motor speed is variable and the motor itself can be mounted either at the top or bottom of the screen. Total arc of movement is 1260 (plus parking 100 beyond the end of wipe).

Standard linkages of the lever type are available, but special linkages can be produced if the quantity required is large enough to warrant the tool cost. Cost of typical linkage (excluding motor) is LI 15s. Ten blade lengths for flat screens are produced—from 7-20 in.—and for curved screens there are also 10 lengths —from 8-20 in. In the longer lengths, curved-screen blades are designed to prevent blow-off. These blades are available in stainless or enamelled steel. Arm lengths vary from 8-21 in. The 2XL motor is priced at £2 and the 4XL at £3 8s.

Norrish Ltd., the British concession

', natre for the Swiss-made F.A.P. air-pres sure wiper motors, has discontinued the sale of these units, but a new version of the wiper is expected to be available in the U.K. shortly. The new wiper, it is understood, will be a more powerful version of the old model with a greater arc of sweep.

L.E. Pere'. Auto Devices Ltd. manufactures the Volix windscreen wiper driven by an electric motor of either 6, 12 or 24V. This wiper is capable of operating two 9-in, blades, blade lengths available being 7 in., 8 in., 9 in., 10 in. and 11 in., both flat and curved. Standard wiping arc is 135' but wipers are also available with an arc of 90°. The motor mounting is exposed and can be fitted either at the top or bottom of the screen. The Volix wiper has a black crackle finish, wIth a moulded bakelite on-off switch. Arms and blades are chromium finished.

P.M.G. Thorpe manufactures a wide r.trige of electric wipers which arc used as orig,;nal equipment on a number of commercial vehicles. The P.M.G. series OSW/128a standard model is available in 12V and 24V units. This model operates at 40 wipes per minute with 110' arc of sweep. It has a built-in switch, and the two-hole fixing conforms to normal British practice. The unit is

recommended for heavy-duty operation and gives a high power output. On the standard model the length of spindle is 86 mm, and length of stud 54 mm. Spindle diameter is 6 mm.

Various spec:al models are available in the OSW series, The arc of sweep varies according to the model and on some versions there are also variations in spindle and stud lengths.

The P.M.G. 014 series wiper ts designed for single hole fixing. This unit, which has a built-in switch, also functions at a rate of 40 wipes a minute and ;s available in both 12V and 24V versions. The length of the spindle is 4.375 in, and spindle diameter is 6 mm. The arc of sweep of the wiper is 1200. Identical to the 014 but with two-hole fixing is the 017 series wiper.

The SWBV model works with a rotary action. This model has two-hole fixing and is available in two versions, 12V and 24V: It is remotely controlled.

The ESM model, a I2V unit designed to fit the Land-Rover, operates at 40 wipes a minute. This model has a built. in switch and the arc of sweep is 120°.

Another wiper in the P.M.G. range is the model SWEV, a rotary-action unit with very high output which has been used by a number of well-known coach bodybuilders. This wiper has adjustable connecting rods and 20 in. double-linkage arm units, which give a pantographic action. It is available in 12V and 24V versions. The wiper, blades, made of stainless steel, are 20 in. long and have a 90° angle of sweep.

Trico-Folberth Ltd., manufactures a wide range of air-pressure Wipers. Heavyduty models are the FPK and the FPH and other models made are the APM. TPM and CHMX.

The Trico 1713K air-pressure wiper motor is designed for exceptionally heavy duty requirements on all types of heavy vehicle on which compressed air is available. The model FPK-375 is fitted with a 0-375-in.-diameter shaft and a special knurled driver which is keyed to the shaft without the need for drilling.

The FPH 375 motor is an improved design of the FPK model. It is said to operate satisfactorily at speeds of over 70 m.p.h. with 26-in.-long arms and blades up to .20 in. long. The FPK 312 motor is similar in performance to the FPK 375, but has a A-in.-diameter shaft.

Details of arms and blades suitable for FPK and FPH wiper motors and their wiping characteristics are shown below: The APM air pressure wiper is relatively new design and has a clos controlled arc of wipe which is dairy to make it suitable for tandem appli lions giving a synchronized motion offside and nearside' screens.

The TPM wiper made by Trico I been redesigned to provide maxim' torque output at normal operating pi sures. It is suitable for use on put service and commercial vehicles arid u back pressure from the air exhaust control the piston stroke.

Wiping speed is claimed to be reas■ ably constant throughout the, normal pressure range of 40-120 p.s.L with any adjustment of the control • kit Power of this motor is automatici controlled by the load on the out shaft. Available power is said 'to sufficient to clear packed' snow from screen. The fitting of a special ban and clip makes manual parking possil TPM models now available include TPM 125, "FPM 1101, TPM 1204, Ti 425 and the TPM 1504. The TPM 1 Model is designed for fitting direct on glass or for any application which j mits only one-hole fixing. With the TI 425 two additional fixing holes need be used. Both the TPM 1204 and TPM 425 are normally fitted with hani for manual operation. The TPM 1 motor has a stainless steel shaft. Spe washers are supplied to allow for sligl varying windscreen frame thickne: ranging from 0-5 to 1 in. The moto fitted with a special parking handle : two clips so that the blade may be par --on the leftor right-hand side.. A is range of arms and blades can be u with APM and TPM motors, arm lenj ranging from 7-20 in. and blade tenj being from 8-20 in.

The CHMX vacuum motor produ by Trico has a large paddle area to al a high torque to be developed at vacuum. A robust valve gear deceler, the end of each stroke, .providint cushioning effect on the wiper shaft a large air filter is incorporated, ensui that only clean air is admitted to motor. A conversion plate can supplied to enable this motor to be Ii in place of existing equipment.

Numerous arms and blades can used with CHMX motors, arm len; _ranging from 7-!--20 in. and blade len; from 8-20 in. N,

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