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xvi ANNUAL REPORT OF THE Off. Doc. OVERWINDING DEVICE FOR HOISTING ENGINES. The many accidents which have occurred from overwinding in hoisting shafts and slopes has demonstrated the necessity for attaching some simple and efficient overwinding device to hoistingengines, and many such have been invented, practically all of which have failed from want of quickness of action. The one illustrated, patented by Messrs. Morris Williams and F. H. Kohlbraker, is being quite extensively used by the Pennsylvania and Reading Companies. It is operated on the general principal of putting on the brake and cutting off the steam supply at the cylinders (not at the throttle) by the release of a weighted lever operated by a positive trippingarm attached to the shaft guides and released by the cage risingabove a predetermined height. The method of operation is clearly shown by the diagram, in which Figure 1 -shows the device set with the cage at its regular landing position, and Figure 2 the device in operation with the steam cut off and the brake put on. "A" is a tripping lever with its arm extending over the guide in position to be raised by the cage when the latter is raised abve its proper height, the raising of "A" releases the catch yoke "B" by moving the roller "C" off the end of its track, "B'' dropping forward slackens the wire connection and permits the weighted lever "D" to drop back, releasing the weighted lever "E" which is normally supported by its end resting on a roller on "D," this lever "E" in dropping closes the valve "G" located in the steam pipe as close as possible to the cylinder, by moving the arm "F," the action being accelerated by the steam pressure acting against "G" and by the same motion through the arm "H" pulls the brake lever "I" and puts on the brake, stopping the engine promptly; where a steam brake is in use the arm "H" moves the valve and puts on the brakes in a similar manner. Tests with this device at the Luke Fidler shaft of the Mineral Railroad and Mining Co., Shamokin, Ra., showed that it is capable of stopping a pair of 32"x48" engines from full speed of 75 revolutions per minute in 1| revolutions or 1.2-10 seconds, and on starting up from the top, which is the way 95 per cent, of the over-hoists occur (viz. by the engineer f<strong>org</strong>etting to reverse his engine), the cage was stopped within less than two feet above the tripping lever, the action of the apparatus being practically instantaneous. The efficiency of the apparatus is in a large measure due to the provision for cutting off the steam close to the cylinders, eliminating the effect of the steam contained in the bow pipes between the throttle and the cylinders, which is often sufficient in volume to move the engines two or three revolutions. Besides its automatic feature, the apparatus can be put into action by the engineer pulling on lever "D" in case of accident to the throttle or link connections.
No. 11. BUREAU OF MINES. xvii [l.'|"l plUU;, M M M N W P3 « M apisino ii-i' '.i. •-•'•'Ml" [IV •SJa>(Oi>» •SJa.loqiq ,s.iauij\[ sassoq say 'uauiajoj auipi O I < H PQ < B—11—1000
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) LAWS RELATING Coal Mining ( lxxv
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: Official Document, No. 11. Sixth
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pf • L ,.,-,-.
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208 REPORT OF THE BUREAU OF MINES.
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210 REPORT OF THE BUREAU OF MINES.
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! ! 33333 ) ooooo « Be^-Se : o No.
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BITUMINOUS MINE DISTRICTS. 19— 11
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Official Document, No. 11. First Bi
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No. 11. FIRST BITUMINOUS DISTRICT.
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Official Document, No. 11. Seventh
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Official Document, No. 11. Eighth B
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Official Document, No. 11. Tenth Bi
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No. 11. TENTH I'.ITI .\ll.\nrs DIST
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No. 11. TENTH BITUMINOUS 1HSTKKT. r
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No 11. TENTH BITUMINOUS DISTRICT. 7
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Official Document, No. 11. INDEX. C
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No. 11. INDEX. 707 Page. Suspension
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No. 11. INDEX. 709 Page. Table No.
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No. 11. INDEX. 711 Page. Table No.
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No. 11. INDEX. 713 Table A—Produc
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No. 11. INDEX. 715 Page. Production
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