28/05/2014 Mobiles & Accessories
Anyusual or preferred raising and lowering mechanism may be employed; but for the purpose of illustration l have shown at each end of the truck-frame a shaft or Windlass 11,<a href="http://www.lightcrusher.com/solutions/mobile-crushers-south-africa.html">mobile crushers south africa</a> upon which the ropes or cables 10 are wound, as best illustrated in Fig. 3, the ends of said ropes or cables being connected with the adjacent ends of the stone-bin proper, which is indicated at 12 and which is adapted to be moved up and down between the standards 5. A short counter-shaft 13, provided with an operating-crank 14, is geared, by means of, a pinion 15 and spur-gear 1b, with the shaft or Windlass 11, the gearing being so regulated as to give the necessary power to enable the bin to be elevated by hand. Pawland-ratchet mechanism 17isemployed in connection with each counter-shaft 13 to hold the bin stationary after it has been elevated to the desired position. It will-of course be understood that the raising and lowering mechanism is duplicated at each end of the bin in order that the opposite ends of the bin proper may be raised and lowered independently of each other. In this way one end of the bin may be raised sufliciently to bring itinto the desired relation to the discharge end of the stone-elevator, while the other end of the bin may be lowered to give the necessary inclination to the grading-screen, hereinafter described.
As the bin is ordinarily constructed of sufficient size to receive ten or twelve tons of broken or crushed stone, it is important to provide means for bracing and supporting the bin when in an elevated position,<a href="http://www.lightcrusher.com/solutions/sand-screening-machine.html">sand screening machine</a>, so as to remove the greater portion of the weight from the raising and lowering mechanism and also from the wheels and axles of the truck. To this end props or braces 18 and 19 are employed, the braces 18 being hinged to the truck-frame 1 and adapted to fold downward and rest on the ground, as shown in Fig; 1, the braces or props 19 being hingedly connected to the end portion of the truck-frame, while the braces 18 are located at an intermediate point and preferably about midway between the front and rear axles. When in use, the braces 18 and 19 are adapted to be folded upward to the position shown in Fig. 2, where they may be held by suitable hooks and eyes or other fastening devices 20.
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