Patent GB-189912092-A (GB)
Title: Improvements in Hoisting-apparatus.
Inventor: RADOVANOVIC ANDREAS
Filed: 1899-06-09
Granted: 1899-10-21
Abstract: 12,092. Radovanovic, A. June 9. Winding and hauling engines; stop gear.-Relates (1) to apparatus for automatically stopping the engine in the event of the speed becoming excessive ; and (2) to modified apparatus for automatically determining the speed throughout the winding operation. Fig. 1 shows the first apparatus, and Fig. 8 the second. A pointer 10 is mounted upon a carriage 2, which is raised and lowered in front of a scale 19, by a screw driven from the engine in such a way that the pointer indicates by reference to the scale the position of the cage in the shaft. The scale shown, for instance, indicates throughout a range of 1000 metres. The carriage 2 also slides u p o n a grooved bar 6, which can be rocked about its axis by a crank 17 and connecting-rod 16 operated by the governor. The rocking motion of the bar 6, which depends upon the speed of the engine, is converted into a rectilinear horizontal movement of the pointer 10 by a quadrant and rack. In this way the pointer 10 is made to indicate the position of the cage by reference to a vertical scale, and its speed by reference to a horizontal one. The maximum safe speed may be indicated by a raised curve x, against which the pointer 10 strikes when the speed becomes excessive, and automatically stops the engine. This is effected as follows :-The governor rocks the bell-crank lever 12 about the axis 27<a>. Upon an axle 24 on the outer end of this lever 12 a double-ended lever 14, 15 is mounted. The upper end of this is pivoted to the rod 16, and the lower is connected by a rod 26 to a bell-crank lever 28, one arm of which in the form of a catch sustains the arm 29 against a weight 30. When the pointer 10 strikes the curve x, should any further rocking of the lever 12 occur the lever 15 turns en its axle 24, and thus releases the arm 29, which then rocks and operates the valve 31. The scale may be drawn on a circular disc which is rotated by the engine ; or it may be drawn upon a cylinder rocked about its axis in a similar way. Fig. 8 shows a modification of the apparatus, in which the passage of the curve x beneath the pointer 10 automatically determines the corresponding speed for the engine. The collar 18, to which the lever 12 is attached, has fixed to it clutch wheels a and b and spur-wheels h and i. Clutch wheels g and f are also mounted on a sleeve which rises and falls with the governor balls. The wheel i gears with one j on the shaft m, with which also the wheel h is connected through wheels l and k. The shaft m gears with one s, upon which is mounted a spindle-shaped screw o, adapted to engage with a spring pawl p on the starting-lever n. The engine having been started, say by moving the lever n into the position marked V, the curve x acts upon the pointer 10. Should the starting speed exceed that prescribed, the clutches a, f engage, with the result that the screw o is rotated until the lever n is brought into such a position V<1> as to reduce the speed the necessary amount. When this result has been attained, the clutches a, f automatically disengage.