Improvements in automatic brake mechanism for colliery tubs or corves and like vehicles

摘要

229,882. Tonks, G. H. March 26, 1924. Railway and like continuous chain, rope, rod, and shaft; back struts; locking vehicle wheels by positive detents. - The movement of mine tubs, corves and like vehicles is automatically arrested in the event of breakage of the main haulage rope or of an intermediate coupling by means of struts which are lowered into engagement with the track and of bolts which are thrust between the wheel spokes. According to one arrangement, the end vehicle of a train to which the main haulage rope is connected is provided with three sliding bars 8a, 8b, 8c. The haulage rope and the coupling 2 for the second vehicle are connected to the respective ends of the upper bar 8a. The one end of the second bar 8b is connected to a safety coupling 3 connected also to a sliding bar 8 on the second vehicle. The third sliding bar 8c is connected by links 10a to sliding bolts 12a adapted to engage between the wheel spokes and also carries a support 17a for a strut 15a hinged at 16a to the underframe of the vehicle. The upper bar 8a has a dependent pin 20 which engages a slotted disc 22 eccentrically pivoted on the bar 8c at 23 and held normally in the position shown by a spring plunger 24. The pin 20 passes through a slot in the intermediate bar 8b so as not to affect this bar. The second and succeeding vehicles are each provided with a single sliding bar 8 which is arranged to operate wheel engaging bolts 12 in a similar manner to that in which the bolts 12a are operated by the bar 8b on the end vehicle, the track engaging struts 15 of these vehicles are however hinged to the respective bars 8 and are normally held raised by fixed supports 17. The bars 8 are connected together by safety couplings such as 3. Should the main haulage rope break, the bars 8a and 8c are moved rearwardly thereby first engaging the bolts 12a with the wheel spokes and then lowering the strut 15a into engagement with the track. The braking of the end vehicle in this way causes the slack in the auxiliary couplings 3 to be taken up and the bars 8 to be moved forward to lock the wheels and lower the struts 15 on the second and succeeding vehicles. During the first part of the movement of the upper bar 8a this bar and the lower bar 8c move together but when the pressure on the spring plunger 24 has been relieved the disc 22 is turned about the pivot 23 to allow the pin 20 to move out of the slot 21 and permit further movement of the bar 8a without movement of the bar 8c. An auxiliary haulage rope may be connected to the bar 8b or this bar may be dispensed with and the safety coupling 3 be connected to the bar 8c.