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Drivers' Seats for Passengers' Comfort

30th December 1939
Page 21
Page 21, 30th December 1939 — Drivers' Seats for Passengers' Comfort
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Characterized by Sound Design and Highgrade Construction, the Busella Range of Adjustable Seating Equipment for Drivers Enjoys Widespread Popularity Among P.S.V. Operators.

A DJUSTABLE drivers' seats manufactured by A. W. Chapman, Ltd., Ranelagh Gardens, Burlingham, London, S.W.6, are used, we are informed, by at least 120 English municipal bus fleets, other p.s.v. fleets in this country and a large number of operators overseas. This is high recommendation and the reason is not far to seek.

From an engineering viewpoint, these seats are designed and constructed in accordance with sound and straightforward mechanical principles and satisfy requirements admirably..

No mean ingenuity has been exercised• in devising the various types available and care has been lavished on every detail of their make-up. Moreover, for their production, equipment and machinery are used that enable the cost to be kept to a minimum, that ensure a large and rapid output, and that promote the high standard of workmanship which characterizes all Chapman products.

Under the name Busella, both the Leveroll and the Leverex seats are marketed. The former comprises a range of 10 types, of similar basic design, but differing in respect of degree of adjustability, position of adjusting controls and back-rest equipment. All have the Leveroll elevator gear.

An accompanying sketch shows a typical model and another drawing the elevator mechanism. It will be noted that there is a non-reversible screw adjustment for raising and lowering the seat and a separate device of similar type for movi,ng it backwards and forwards. Both are operated by conveniently placed handles. Parallelism and steadiness are ensured by the well-fitting guides. There is 3i ins, of movement in each direction. The elevator mechanism is a neat engineering job. It incorporates a skew gear giving a 2-to-1 reduction, The driving wheel is steel and the larger driven wheel is bronze, the latter being also the nut which works on the fixed steel, square-threaded screw. It is a well-made unit. In another design bevels are used instead of spiral-toothed gears.

Of simpler design, but employing a similar elevator, the Leverex seat is backless and has only up-and-down screw adjustment. Comprising essentially an upper and a lower rectangular frame, it depends for its action upon a lifting mechanism having the screwed pillar mounted vertically in the centre at the front.

Parallelism, in this case, is ensured by three pairs of crossed diagonal links, each forming a "lazy tongs " unit. Each link is pivoted at its mid point to its fellow, at one end to a frame fixing and at the other to a frame slide, and the arrangement is such that movement of the front of the frame, imparted by the elevator, is faithfully reproduced by the links at all other points.

Provision is made for sliding adjustment fore and aft. The vertical movement afforded is 31 ins, and the horizontal 7i ins.

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Locations: London

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