“ROLLER” BABY MUSKURAHAT | MODEL CONSTRUCTION

It so happened that almost all the children’s toys with a muscular drive — pedal cars, maps, bikes — designed for use in main leg muscles. And almost none of these machines work the muscles of the hands. It is in vain, since the movements resembling, for example, rowing, at the same time would be included the muscles of the arms, shoulders and back. Such actions also contributed to active pulmonary ventilation. All this prompted me to design and fabricate for my son “Roller”-muskurahat with manual transmission.

By construction, the “Roller” is a four-wheeled car with a driven rear axle and swivelling front. They may use wheels from bicycles and scooters of various sizes, from 150-33 (8¹/₂X1¹/₄) to 205-56 (12¹/₂X1¹/₄).

The machine frame is made of steel tubes diameter 20X1. 5 mm, curved in the form of a farm and connected by means of two welded brackets. Back to the frame on the welding are mounted two bearing housings; front — swivel: change of direction “Roller” by turning the front beam axle on which are placed the feet of the driver. They have a special profile that provides them a comfortable position.

Children’s recumbent lever manually operated and steered front wheels:

1 — wheel (from a child’s Bicycle or scooter), 2 — tubular frame (steel tube Ø 20X1,5 mm), 3 — front rotary shaft (steel rod Ø 12 mm), 4 — rear axle (steel rod Ø 12 mm), 5 — the front beam, 6 — star drive the ratchet one-way clutch (from a child’s Bicycle), 7 — eyelets under the axle of the swing arm actuator (steel sheet thickness 3 mm), 8 — axis chachanna of the drive lever (bolt of M6 with nut and washer)9 — lever “Roller” (steel strip with a thickness of 5 mm), 10 — pull the plug, 11 — rod, 12 — Bush roller chain, 13 — recoil (Ø 25 X 2 mm), 14 — bracket, 15 — seat, 16 — clip (steel tube Ø 10 mm), 17 — arm actuator lever (steel tube Ø 20 mm) 18 — protective covers (rubber or plastic).

Front beam “Roller”:

1 — clip (steel strip with a thickness of 5 mm), 2 — plain bearing (bronze bushing), 3 — axis (steel rod Ø 14 mm).

Swivel front member of the “Roller”:

1 — clip, 2 — tube frame, 3 — axis, 4 — Bush.

Actuator design “Roller” is different from the classic chain or crank mechanism. It is arranged as follows. On the rear axle mounted sprocket, which is located inside the one-way clutch with a ratchet from a child’s Bicycle. Sprocket rigidly fixed to the rear axle, here are attached and wheels “Roller”.

In the front part of the frame is welded lugs with holes, in which freely enters the lever axle drive of the machine. In the lower part of this lever has a hole mating with the hole in the fork traction chains. Bicycle chain covers the sprocket and the bottom end connects to the tension spring (Ø 25X2), which is secured to the eye bracket front pivot shaft “Roller”.

On top of the frame is installed the seat with a bracket, bent from a pipe Ø 10 mm, which is the handle for lifting the vehicle when it is carrying and support for the back. Across the top of the arm is welded a section of pipe which are stretched two arms of suitable polymeric hose.

Drive “Roller” works as follows. At the initial moment under the action of the spring lever arms is in its extreme forward position. Pulling them on, the child moves the lever-rocker on its axis, the lower part of the lever moves forward and pulls the chain. The last crank sprocket, and with it the drive shaft of “Roller” wheels. When you move the chain the spring is stretched, and the reverse movement (away from you) is free wheeling of the ratchet mechanism of the sprocket; it moves by inertia. Then the cycle of movements is repeated. By changing the ratio between a lever arm of the actuator, it is possible to adjust the magnitude of the transmission ratio, and hence the magnitude of the applied force.

Leonid PISKUN

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