The cantilevers chosen from the condition that the rotary wheel would be able to make a complete revolution. The console is made of duralumin bar. If there is no such block, then fit the segments of steel tube of rectangular cross section. But then — the holes for the pivot — insert a steel sleeve.
The rack is made of segments water gas pipes, which are assembled and then fixed cores on the circumference of the weld nuts M6 (exactly the same as in the arms, so the drawing is not provided).
The length of the shaft running wheels is selected so that the wheelchair relatively freely down a standard door. The basis of the shaft is also cut water gas pipes. Its ends are pressed on the axle, machined from tool steel u7 or U8 (in the case of other steels, such as 40CR, these parts require heat treatment — hardening).
In the manufacture of axles, some of them landing sizes have to be checked with the ball bearings and cones out of the bushings of Bicycle wheels. Well, the axle passes freely through the sleeve, their flanges on one side was reamed to a diameter of 12 mm After setting the wheel to the shaft of the threaded pins clipped closed with plastic stoppers from champagne, who have a good hold on the lock nuts and their camouflage.
In the manufacture of the Parking lock of the lengths of its lever and rods were chosen such that before the first patient was reached without difficulty, and the second in its working position provided for lifting the wheels above the floor to a height of 3-5 mm.
Each of the locating blocks based g tion of the chair drilled five vertical holes for M8 screws: two rear — for mounting consoles, three front — for the attachment of beams and one — screw M6 mounting rack(top rack are fastened with screws M6 with round heads that were driven through the plywood seat and a tubular frame of the chair). Between the cradles, consoles and beams placed bushings-spacers. They need to be able to adjust the swivel wheels, which should have complete freedom, and to expose the gaps under the road wheels when in the working position of the Parking lock.
The armrests are installed to the side between them and the tyres were gaps of at least 40 mm.
Bearings suspension and axle steering wheel is covered with grease tsiatim-201.
If a running wheel is needed in the back, with them moved back and strut (in the middle hole of the locating blocks of the base). There are moving beams and plywood, the focus of the Parking pawl (it is attached to the beams with screws). And here is the console with the swivel wheels are moving forward. They bear footrest.
All these movements it is easy to implement since the diameters of the locating holes in the locating blocks of the base of the chair and the distance between them for beams and consoles are the same.
A. MANGUSHEV, Stavropol
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