FR2515225A1 - Wrench for tightening or releasing railway track bolts - comprises reversible motor driven reduction gear with torque limiter - Google Patents

Abstract

The wrench for tightening or releasing the bolts which secure railway tracks to sleeper has a reversible motor, driven by compressed air which feeds a reduction gear (2) incorporating a torque limiter (3). A frame (5) attached to the tool body carries a wheel (6) at its free end, which allows the tool to be moved alont the track. The use of a remote air compressor feeding through a pipe (8) makes the machine portable and prevents the tool from being used manually when the compressor is turned off.

Description

 The present invention relates to a machine e @ era for screwing and unscrewing the lag bolts or ioulons for fixing the rails on the railway sleepers, and can be easily transported by one man.

 Currently, motorized screwdrivers do not in any case be transported by a single man, but current and future + raffic conditions often require that track maintenance work be carried out without slowing down the trains, and therefore the equipment used for this work can be quickly put out of track by the operator of each mechanical machine used.

 These conditions therefore require that the productive source of energy, often having a large mass, be put out of the way.

The machine according to the invention is therefore simply composed of a motor for receiving the machine, this motor having a large tightening torque / weight ratio and comprising a reversing device, of the direction of rotation; and additional speed reduction and tightening torque members. It is also necessary that the engine exerts no residual drive torque when its power supply is zero, which allows to obtain normal working conditions. For example, this motor may be an oneumatic impact wrench making it possible to obtain zero drive when the key is not supplied with compressed air. The compressed air is supplied by a compressor group placed outside the track.

At the end of the impact wrench forming a motor, a speed reducer is installed, then a tightening torque limiter. The assembly is secured on a chassis allowing the free circulation of this assembly on an ordinary railway track
The accompanying drawing illustrates by way of example an embodiment of the machine according to the present invention.

As shown schematically in Figures 1 and 2, the light spinner includes an pneumatic impact wrench 1, a speed reducer 2 placed under the impact wrench 1, and a torque limiter 3 placed under the speed reducer 2 at the end of which the lag screw tightening key is fixed 4
A chassis 5 is integral with the reduction gear 2 and comprises a wheel 6 circulating on the rail 7 of the railway allowing the advance of the machine on the track. The impact wrench 1 receives the compressed air necessary for its operation from an air compressor not shown in the drawing via a flexible pipe 8.

 When the compressor supplies the impact wrench 1 with compressed air under correct pressure, it is then enough for the Driving Agent to actuate the trigger 9 to supply and put into operation the impact wrench 1. The reverser of the direction of rotation 10 placed on the impact wrench 1 provides either the screwing or the unscrewing of the lag screw of the railway.

The square it at the outlet of the impact wrench 1 causes the speed reducer 2 to be directly engaged, the main characteristic of which is that it is reversible. The output shaft 12 of the reduction gear 2 in turn drives the upper shaft 13 of the torque limiter 3. This limiter 3 consists of an adjustable assembly, the principle of which is already known, and comprising a free wheel when the lag screw is screwed. The drive shaft 14 at the outlet of the limiter 3 drives the tightening key 4.

 The machine object of the invention can be used in all cases of routine maintenance of the track, where it is necessary that the machine is as light as possible so as to be quickly derailed and put out of track by one man at the announcement of a train.

Claims (1)

CLAIMS proper without any clutch device (automatically disengaging the shaft from the drive system or any other system resulting in the separation of that of an air impact wrench) or a magnetic motor device is removed implies a mechanical device such as on the lag screw when the energy source supplying the means for eliminating the tightening force of the elé any disengaging device age 2 / Tensioner according to claim 1, characterized in that supplying the motor is removed, without the addition of a tightening of the key on the screw d when the energy source to cancel the drive torque and eliminate the effort characterized by the fact that the motor comprises a reversible own means driving a tightening torque limiter, rotation a 'l end of which is placed a torque / weight speed reducer comprising a direction reversal device  1 / Tire spinner driven by a motor with a high ratio