Show electric motor molar driven mine hoists WRITTEN FOR THE MINING REVIEW since the cycle of operation in any hoisting proposition is of an intermittent character the power required is at a maximum only a part of the time even though the host hoist be operated practically continuously in many cases the hoist is in operation only a very small part of the day these conditions offer special advantages from an economical point of view for the use of electric motor driven hoists the electric host hoist is always ready and uses power only in proportion to the load handled when it is in actual operation the bearings are self oiling and the motors seldom require any other attention than an occasional inspection and cleaning there are no complicated parts to get out of order or to re continual oiling pack M OF W T 1 T double drum electric motor driven mine hoist ing etc the electric hoist may be operated by almost any one as no previous experience peri ence or mechanical knowledge is required and an engineers license lice nse is unnecessary the single and double drum electric mo tor driven mine hoists of the S flory manufacturing company bangor pa are well wel I 1 shown by the accompanying pictures these hoists which are especially designed for mines quarries planes shafts etl etc are equipped with the 1 I 0 werner patent band friction and are driven by westinghouse motors the patent band friction is of spec al design and possesses many features of superior merit it is actuated through different diff er members the gear drum rocker shafts and strap bands the strap bands tighten on a cast rim on the drums and are actuated by shafts which have double stub ends and are connected to the ends by jaw ends and turnbuckles turn buckles the lower arms are keyed to the rocker shafts on opposite ends and are actuated by the levers which move around fixed points on the gear slides are secured on the gear supporting the lever arms th the e slides are actuated through a sleeve on the ma n drum shaft and two radial arms which are secured to the slides the frictions are thrown in and out of contact by means of hand levers in a battery as shown by the cut of the double drum hoist or by an air cylinder using an equipment similar to street railway car air compressors as shown by the picture of the s single drum hoist by moving the sleeve to the gear the slides are actuated in a radial direction that operates the stub levers and rocker shaft this causes the band to grip or tighten on the brake flanges of the drums the reverse motion of the sleeve releases the friction A strong claim is 18 made for the gripping device after the frictions are thrown into contact they will positively remain in this position until released the drum and gear form a unit and can be operated as a reverse motion ho host st without producing any end strain on the gea bearings rings the value of which is obvious when the frictions are thrown out of contact the drums are loose anthe on the shaft and will revolve free at high speed when lowering or paying out the rope the single drum hoist is shown with a westinghouse electric railway a r compressor and air reservoir mounted on the base of the hoist the reservoir is connected to the air cylinder at the end of the drum shaft the air valves are actuated by a lever shown close to the battery of two levers and controller very little exertion is required by the motorman to throw the friction in and out of contact as it is of the toggle type after the air pressure is put on the contact continues until the friction is reversed by the reverse motion the drums are turned off smooth or machine spirally grooved for any size wire rope and mounted on a self contained cast iron base arranged to rece ve the motor and mm 2 P single drum electric motor driven mine hoist controller the drums for ion long planes or heavy lowering are equipped with asbestos brakes made out of long fibre fabre material the blocks are formed in sectors with iron flanges securely bolted under high pressure and treated with oil they are secured between cast iron flanges and surrounded with steel bands of the differential type the brake bands are operated with hand levers in notched quadrants fitted with thumb latches and are thereby securely held in any po the advantage of asbestos brakes for long planes or shafts is decided the single drum hoist shown by the photograph was installed at the bliss colliery of the D L W company the brumis drum is 60 inches in diameter 48 inches long between the flanges and is designed for an ib ab rope strain at a speed of ft per minute the hoist is operated by a westinghouse type HF H P alternating current motor this type of induction motor is especially suited for aepli cation where a strong starting effort is needed it is well adapted for use on circuits carrying lighting loads as the starting of it does not appreciably affect the voltage regulation these motors are controlled by standard westinghouse single handle reversing drum type controllers which insert resistance in the secondary at starting and gradually cut it out as the hoist speeds up the controller has a large number of points that gives smooth acceleration when the controller is in the off position the motor is entirely disconnected from the line the double drum hoist shown was installed for the bessemer coal iron land company messina ala it is connected to a westinghouse H P motor of the same type |