1930-05-08 — Page 10

10

THE CHINA MAIL.

THURSDAY, MAY 8, 1930.

ANTHE MOTORISTS' PAGE WA

Greater Strength-Greater Safety- Greater Comfort-Greater Value

RIDE ON A BACKBONE OF FORGED STEEL

WHICH CHARACTERISES

1930.

B. S. A.

1930 B.S.A.s with inclined engine now have a frame with a backbone of Forged Steel, giving super frame strength and rigidity. That is just one of the features which help to make 1930 B.S.As bigger value than ever. Others include: finger adjustment to both brakes. clutch, and fork shock absorbers; hinged rear mudguard and low-lift, spring-up stand; new wide-flare front mudguard, etc.

Come and buspect the New Models in Stock,

THE SINCERE CO., LTD.

SOLE AGENTS.

BUYERS' GUIDE

MOTOR CARS.

ARMSTRONG SIDDELEY.-Hongkong Hotel Garage, Queen's

Road. C,4759. BUICK-The Dragon Motor Car Co., Ltd., 88 Wong Nel Chung

Road, Happy Valley. C.1247.

· CADILLAC.--Hongkong Hotel Garage, Queen's Road. C.4759. CHEVROLET.-Hongkong Hotel Garage, Queen's Road. C.4759, CHRYSLER MOTOR CARS-Republic Motor Co. of China 80-92,

Des Voeux Road C. Tel. C, 1216 & 6252.

DE SOTO MOTOR CARS-Republic Motor Co. of China, 80-32,

Des Voeux Road C. Tel. C. 1216 & 6252. GUY MOTOR PASSENGER BUSES-Republic Motor Co. of China,

30-32, Des Voeux Road C. Tel. C. 1216 & 6252. MORRIS.-Hongkong Hotel Garage, Queen's Road, C.4759. OAKLAND-Lane, Crawford, Ltd. OLDSMOBILE-The Dragon Motor Car Co., Ltd., 88 Wong Nei

Chung Road, Happy Valley, C.1247.

PACKARD MOTOR CARS-Republic Motor Co. of China, 30-32,

Des Voeux Road C. Tel. C.1216 & 62b2. PLYMOUTH MOTOR CARS.-Republic Motor Co. of China, 30-32,

Des Voeux Road C. Tel. C. 1216 & 6252. PONTIAC.-Lane, Crawford, Ltd.

ROLLS-ROYCE.-Hongkong Hótel Garage, Queen's Road. C.4759. STUDEBAKER.-Hongkong Hotel Garage, Queen's Road. C.4759. TRIUMPH MOTOR CARS-The Globe Automobile Co., Ltd.,

1. Canton Road, Kowisen.

VAUXHALL-Lane, Crawford, Ltd. WILLYS-KNIGHT & WHIPPET MOTOR CARS.-Gilman & Co.,

Ltd., 48, Des Voeux Rond C. Tel. C. 290,

OUTBOARD MOTORS—Rudolf Wolff & Kew, 54 Queen's, Road

C, Tel. C.2178.

MOTOR TRUCKS AND TRACTORS. BROCKWAY, MOTOR TRUCKS.-The Asiatic American Co. Tel.

C. 244.

CHEVROLET.-Hongkang Hotel Garage, Queen's Road. C.4759, FARO MOTOR TRUCKS-Republic Motor Co. of China, 80-82,

Des Voeux Road C. Tel. C. 1210 & 6262.

BRAKE SIMPLICITY,

A Duo-Servo · System

As the shoes are interchangeable the servicing problem is rendered ensler, and when the lininga finally need replacement it is intended that the whole shoe should be exchanged for a new one, credit being allowed for the old shoe. Incidentally, the shoce are built up of steel, and all parts are cadmium-plated to protect them from rust. It should also be noted that the only lubrication re- quired is thut of the bearing of the spindle carrying the operating link.

There has recently been developed a two-shoe brake which has a self- energising servo action in both directions of rotation (says Autovar). This is something of an

Aa regards operating gear, the achievement, and it stands to the Bendix lever type front control is credit of Bendix-Perrot Brakes, recommended, but other types can Ltd, who are well known as the pro-be used, ducers of the three-shoe brake used on-80 many American cars. As the Intest Duo-Servo brake is now in production at the Westwood Road Works, Witton, Birmingham, and We have often advocated the fit- will figure on several high-class ting of a sprag to the modern car British cars in 1930, the following which would automatically hold it details are of interest,.

from running backwards on 'a hill

AUTOMATIC SPRAGS.

A Novel Invention

In the first place, it should be and would thus relieve the driver. understood that self-energisation of the awkward manipulation of must not be confused with servo clutch, throttle and brakes at pre- action, as is often the case. In a sent necessary when restarting hon-servo two-shoe brake the front under such conditions (says the shoe is self-energising when the car Motor). Certain of the novel moves forwards, because the contact transmission systems which have of the show with the drum tends to been developed during recent years pull the shoe round and so assist in embody an automatic spragging ac- applying it. On the other hand, astion of this kind and of these regards the rear shoe, the frictional) the Milliam free wheel is a notable drag, far from assisting, definitely example: then, again, in America resists the applying force. When the Noback" device was brought the car moves backwards the posi-out affew months ago and has since tion is reversed.

become standardised on certain

In a servo brake the front shoe is models of the Stutz. Consequent- not pivoted to the back plate, but ly, it is interesting to record that hinges on the end of the rear shoe, considerable progress is being the other end of which is anchored made by a sprag invented by a Bri- to the back plate. The front shoe, tish engineer which we priginally. therefore, is free to move slightly described nearly a year ago and in response to the frictional drag of which has since withstood severe the drum, and this action in turn tests very successfully.

applies the rear shoe. It is the We tried this device the other front, or primary, self-energising day as fitted to a Morris-Oxford car shoe acting on or serving the rear, and found it to be very quick and or secondary, self-energising shoe positive in action, not allowing the which constitutes servo nction. This car to run back more than an inch was the action, in the forward direc-or so after coming to rest up-hill. tion only, of the frat Perrot two- Matters are so arranged that the shoe servo brake.

sprag is held in an inoperative Duo-Servo Layout.

position when top, second speed or In the Duo-Servo two-shoe brake reserve speed is engaged, but is re- the two shoes are linked together by leased in readiness for action when means of a simple adjusting screw the gear lever is in first speed with right and left-hand threads. or neutral. Consequently, when The other ends of the shoes are stopping on a hill the driver has located by anchor pins fixed in the only to push the gear level into neu- back plate, but the ends of the shoes tral in order to prevent running have pear-shaped holes which allow back, and when he subsequently en- the shoes to leave the anchor pins.gages first gear the sprag action Between these ends of the shoes is remains, so making it quite un- the expansion gear, consisting of a necessary to operate the brake. The floating link and two trunnion only reason for making the sprag blocks, operated by means of a inoperative on the other gears is small crank. The trunnion blocks that by this expedient the rate of bear on the ends of the shoes and wear of the parts is reduced. this method of expanding the shoes, The sprag itself its behind the

In conjunction with the pear-gearbox and consists of a toothed shaped holes, enables either shoe to wheel mounted on the tail end of be moved independently of the the main gear shaft, with which other.

engage four stout pawls. Sur-

When the brake is off, the two rounding the pawis is a control shoes bear on their anchor pins, but ring which, if moved angularly to when the brake is applied, with the a small extent, by a lever, holds car moving forwards, the front shoe the pawls out of petion. We ought is the primary, the frictional drag aled to explain that one pair of carrying it round slightly, so that it pawls is offset to the extent of half leave the anchor pin free to force a tooth, so that the maximum back- itself and the rear shoe against the lash is only half the pitch of the

teeth. drum.

The secondary shoe remains in The control lever, which deter- contact with its anchor pin, which mine whether or not the pawla are takes the braking torque reaction. operative, is actuated automatical- When the car is moving backwards ly by a cam plate aliding in guides the rear shoe becomes the primary and carried forward to the gear and leaves its anchor pin, while the lever. The lower end of the genr front shoe takes the torque reaction. lever slides in an L-shaped slot in Adjustment of this brake is parti- the plate and the ball end of the cularly simple, for the right and control Tever worka in a V-shaped left hand threaded screw which slot. Placing the gear lever In links the two shoes to one another neutral causes the control lover to, carries a toothed wheel normally come Into the centre of the

G.M.C.-The Dragon Motor Car Co. Ltd., 38 Wong Nel Chung Road,locked by a spring piste. Through V-alot, In which position the

1

Happy Valley. C.1247.

:

DODGE. South China Motor Car Co., 83, Des Voeux Road. C.

Tel. C. 5644.

MORRIS-Hongkong Hotel Garage, Queen's Road. C.4759. REO MOTOR TRUCKS-Republic Motor Co. of China, 80-82, Des

Voeux Road C. Tel. C. 1216 & 6252. STUDEBAKER.-Hongkong Hotel Garage, Queen's Road, C.4759. WILLYS-KNIGHT & WHIPPET TRUCKS-Gilman & Co., Ltd.,

4a, Des Voeux Road C. Tel. C. 290.

MOTOR CYCLES.

B. BA-The Sincere Co., Ltd., Des Voeux Road. C.1067. NEW HUDSON MOTOR CYCLES-Republic Motor Co., of China,

80-82, Des Voeux Road C. Tel C. 1216 & 6252. RALEIGH MOTOR CYCLES-Republic Motor Co. of China, 30-32,

Des Voeux Road C. Tel. C. 1216 & 6252. ROYAL ENFIELD MOTOR CYCLES-Republic Motor Co. of China,

80-82, Des Voeux Road C. Tel. 0. 1216 & 6252. TRIUMPH MOTOR CYCLES-The Globe Automobile Co., Ltd.,

1, Canton Road, Kowloon.

"

TYRES AND ACCESSORIES. ACCESSORIES-Hong Kong Hotel Garage, Queen's Road. C.4759, ACCESSORIES-The Duro Motor Co., Nathan Road, Kowloon, K.220. FISK TYRES-Gilman & Co., Ltd.. 4a, Des Voeux Rd. C. Tel.:

MILLER ACCESSORIES A. Lung & Co., 19, Queen's Rd, C., DOR Tel. 0.1219. KA

PRESTOLITE BATTERIES-Hongko

Queen's

WILLARD BATTERI

Hotal Gar

Iman - & Co., 144, 46, Den Voeur Ra

a slot in the back plate this wheel rawls are operative; the gear can be revolved by means of a lever can then be moved into the screw-driver, so that a very fine ad-speed notch without affecting the justment is thus obtained. No ad- Pawls. Moving it into any other justment is neccesary in the brake-position, however, causes the com operating gear, and in consequence plate to slide and the V-alot then all the levers maintain their pre-operates the control lever and ring determined angles.

| in such a way as to raise the pawls.

Many Advantages.

It is the intention to manufac- Many advantages are claimed for ture this interesting device shortly this brake, and those which appeal in a form suitable for easy fitting to the owner-driver are the sim- to Morris-Cowley and Morris- plicity of adjustment, the rapidity Oxford chassia at a total cost to estimated at with which it can be effected, and the owner-driver the very moderate pedal pressure a total about 10 guineas. The par- required to produce powerful brak ent concern is the Motor Safety and Ing. Other advantages appeal more Free Gear Co., Ltd., 20 Saville Row, perhaps to the manufacturer and to Newcastle-on-Tyne, and the sprag the service department, for as no has been named "Saifgo." adjustment is necessary in the brake-operating gear this can be simple, while, as the extra braking | foxces do not pass through the brake gear, the efficiency of the operating mochaniem. Itself is a greater than when the rear has to: transmit the servo action to tha shoes,

It is possible to use a intich are of contact, with the drum In floating choo brake, thereby ing Its life and avoiding the sity for constant sajustmen shoe in the Duo-Servo brake are of contact of 121 des

QUICK AND

EFFICIENT

REPAIRS

TAT GARAGE

AMAZING

We give these feeble overworked words a rest/

What is known as an ASSERTIVE ADVERTISEMENT states positively, or claims, or frequently boasts and brags- WITHOUT OFFERING TO PROVE.

Here are a few specimens taken at random from nagazines.

"The Most Beautiful Car in the World.”

"The Joyous Satisfaction that only can give."

Each year, some one appealing motorcar emerges from the throng of commonplace cars and wins world-wide preference. This year, it is the dashing new Sports Roadster that occupies the spotlight."

As someone has written: "Oh, listen to the buibul ”—which the dictionary tells us is "a red-whiskered bird of the tropics with a loud, raucous voice."

Is it any wonder that the public reads laughs good- naturedly, disbelieves ? Or that, having read, a man turns lo- his neighbour asking whether such and such a. car is really any good"?

“Self-praise is no recommendation,” runs an old proverb. And so it is with most oil. manufacturers — they assert but do not offer to prove.

We tender proof of the truth of the statement that Gargoyle Mobiloil is the most economical and efficient motorcar càgine Jubricant. Ask for proof → we have tons of it.

Vacuum Oil Company

THE FULL-SIZE PLYMOUTH

now at new low prices

SIZE

Plymouth is Chrysler's car in the lowest-price field-therefore it is the only car in that field to offer the distinctive engineering ad- vancements and precision crafts- manship which have made Chrysler-built cars world-famous. Plymouthstands alone among cars of lowest price with internal-ex- panding 4-wheel hydraulic brakes -weatherproof," self-equalising and permanently positive. Plymouthstandsalone among cars of lowest price with its full-size -dimensions throughout-in body, frame, axles, transmission and power plant.

Afits new substantially lower prices, Plymouth offers value without par- aller in its price class. See the car, drive it. You will be convinced.

HRYSLER

RO D. U

CT

PLYMOUTH

MOTORS

THE NATIONAL MOTOR CAR CO.

484-486, QUEEN'S ROAD, WEST.

TEL. 25674.