THE MECCANO ROUNDABOUT
A MECHANICAL WONDER THAT WILL PROVIDE HOURS FUN
Revolving platform and superstructure, rotating cars, leaping horses, etc Operation entirely automatic.
Fig.1 Gral View of Roundabout.
From time beyond memory the roundabut has been a source of pleasure to young people. The progress of civilisation has changed it, of course, as it has changed almost everything else, and it is difficult to recognise the huge whirling structures of to-day as the direct descendants of the creaking contraption which, at the instance of a perspiring operator, was induced to revolve slowly with its load of half-a-dozen children. Yet from this humble source have sprung all the hurtling dragon, flying boats, and similar ingenious devices with which our modern fairs are provided.
Fig.2 Base of rondabout, sowing gear roller-Bearing Unit position
Note the Pinion by which the upper Race carrying the Rondebout is rotated.
In its original form, however, with a few alterations such as increased size and the use of steam or electric power, the old favourite is as popular as ever, and it is a poor fair that does not boast an old-fashioned rondabout.
Young people who, having attained the mature age of sixteen or seventeen, are restrained by an overburdening sense of responsability from taking part in the general “fun of the fair,”often yield to the temptation to bestride a glorified quadruped bearing the somewhat fanciful inscription”Sally” or “Dobbin,”and even staid old men who, if they have smiled at all during the last ten years, do not betray the fact by their faces, have been known to cast dignity to the winds and take a ride “for old time sake.”
The Meccano Roundabout is an excellent example of the adaptability of the Meccano system. The different movements, which include the rotating superstructure, the revolving cars, and the leaping horses, are all faithfully reproduced as in the prototype of the model, and its appearance when working
The base of the roundabout (Fig. 2) is built of two 24 1/2" Angle Girders joined by nine 12 1/2" Angle Girders 1, 2, 3, 4. A 5 1/2 by 2 1/2" Flat Plate 5. bolted to the Girders 3, carries two Trunnions joined by a 2 1/2" by 1” Double Angle Strip 6, which, together with the Plate 5, provides bearings for a short Axle Rod carrying a 1" Sprocket Wheel 7 and a special toothed wheel 8.
The Roller Bearing (Fig. 2).The large Geared Roller Bearing on which the whole of the superstructure rotates may be purchased as a complete self-contained unit (part No. 167).
It is suitable for incorporation in many different models, and comprises two
Leaping Horse detached from rondabout
Bracket to a circle formed of five 12 ½” Braced Girders and one 5 1/2" Braced Girder (Fig. 1). These Girders are all bolted end to end except the 5 ½” Girder, one end of which overlaps the adjoining 12 ½” Girder by three holes, and are joined by 9 ½” Strips 15 and Architraves 16 to a similar circle of Braced Girders 17, connected in their turn by means of the 9 1/2" Strips 18 and the 3 1/2" Strips 19 to Angle Brackets bolted to two Face Plates 20 (see figs. 1, 4). A circle com-
Operating Mechanisn at top of Main Stem
Mechanism operating Revolving Car.
Creatures and the iact that they bear only a slight general resemblance to the animals whosename they boast will, unless our experience jof roundabouts is at fault, make them all the more suitable for incorporation in'this'model. The body of each horse, as will be seen from Fig. 3, consists of a Sector Plate, and is provided with a tail (a 2 1/2" large radius Curved Strip) and four 2 1/2" Strips representing legs. The passenger is expected to sit astride the horse immediately behind the supporting Strip. During "rush hours" no doubt an extra passenger could be squeezed in between the front of the supporting Strip and the horse's neck. The gracefully archerd but rather ill-nourished neck may be distinguished from the tail by the fact thats it bears a shapely head (two 1 1/2" Strips) surmounted by a Flat Bracketwith which the poor beast must do his best to hear. Much fun may be obtained by adjusting the angles of the neck, tail, and legs to represent the characteristic trotting and galloping attitudes. Each of the horses is carried on a 5 1/2" Strip bolted to a Single Throw Eccentric 28, which, secured to one of the Rods 24, imparts a realistic leaping motion to the horse. One end of the horizontal Rod 24, on which the Eccentric 28 is mounted, is jurnalled in a 1” by 1” Angle Bracket secured to the lower the Face Plates 20, while the Braced Girders 17 and the Architraves 16 provide a bearing for the opposite end.
|of the Sector Plate forming the body of the horse. This arrangement is identical for both horses, as can be seen in Fig. 1 .
of the Sector Plate forming the body of the horse. This arrangement is identical for both horses, as can be seen in Fig. 1 .
Each revolving car (Fig. 6) comprises a Face Plate 35 to which seven 2 1/2" small radius Curved Strips are affixed by means of Angle Brackets. Six 2 1/2" large radius Curved Strips attached to the
upper ends of the small radius Strips form ; rest for the occupants of the car. An 11 1/2 “ Axle Rod 36, secured in the boss of the Face Plate,is journalled in bearing consisting of the 5 ½”by 2 ½” Flat Plate 31 and AngleBracket 27 bolted to one of the 9 1/2" Strips 18. This Rod
in irance will be greatly enhanced if the roof, n with suitably coloured cardboard. . the Roundabout should be oiled at frequent attention being paid in this respect to the Geared Roller Bearing. If this is done, the model should work almost noiselessly and without any sign of shaking or rattling. The gearing has been so arranged that the Roundabout will operate at a speed proportional to that of its prototype, but if a greater speed is required, it is only necessary to make a slight alteration to the gearing similar to that already described, as the Electric Motor has an ample reserve of power.
Those boys who possess a sufficient number of parts will doubtless be able to improvide the model considerably. For eample the revolving platform might be filled in with Flat Plates, and steps might be arranged around its sides.
LIST OF PARTS REQUIRED TO BUILD THE MECCANO RONUNDABOUT
If desired Meccano built-up roller bearings may be substituted for the special Geared Roller - Bearing unit. Suitable built- uproller bearings are described in the " Standar Mechanisms Manual "(detail Nº.101)If this form of construction is adopted the following
alternationns are necessary to the list of parts requiered. for part Nº167 substitute.