Patent GB-200201-A (GB)
Title: Improvements relating to controlling apparatus for winding or hauling machines
IPC: B66B1/12
Filed: 1922-04-07
Abstract: 200,201. Wild, M. B., and Wild & Co., Ltd., M. B. April 7, 1922. Regulating and control-transmitting gear for winding and paying-out apparatus; overwinding, preventing; brakes. - A hand lever for normal operation of braking mechanism is connected detachably to a slidable or reciprocating bar carried by a pair of levers one of which is utilised to transmit movement to the braking mechanism, the connection between the bar and hand lever being such that they can move in unison, in both directions or the bar can be disconnected and operated independently of the hand lever. The invention is shown applied to a complete apparatus in which a controller hand lever is connected to a cam driven by a winding-machine so that the throw of the lever is limited to a definite amount for each point in the wind, the lever being brought back to " off '' position at the end of the run. Also other levers are used, controlling brakes applied gradually, or quickly in emergency, or automatically in the case of failure of current supply or of an overwind. The controller hand lever a, Fig. 3, pivots on the main shaft b and actuates the electric controller through the medium of a rod d. Movement of the lever a also actuates a double bell-crank e through the medium of springs g. The bell-crank operates a cam lever h linked to a lever l forming part of the emergency braking mechanism. The cam lever h also carries a pin n co-operating with a cam driven by the winding drum, so that the position of the cam lever is controlled for all points during the wind, the throw of the controller hand lever being correspondingly controlled. At the end of the wind the cam automatically returns the controller hand lever to mid-position. The ordinary brake lever r, Fig. 4, controls a sliding bar s which operates a shaft w linked to the valve gear of a compressed air engine, the latter keeping the brakes " off " against the action of weights. The bar s can be moved independently of the brake lever by mechanism actuated from the governor 3, Fig. 7. A lever 5 connecting the governor with a cam 4 is arranged so that it moves the link 7 whenever the speed of the drum gets outside the allowable limit for any particular point in the wind. This movement is transmitted through the lever 10, Fig. 4 to raise the link 8, and thus bring the stepped part 11 into register with a cam 12 driven by the drum. The cam then swings the link 8 to move the bar s through the medium of the roller 9. The emergency brake lever 47, Fig. 5 has a roller 16 which raises the bar s, Fig. 4, out of control by the lever r, and a notched arm which releases a weighted bell-crank 19. The bell-crank rotates the shaft 20 and thus moves the bar s, Fig. 4, through the medium of the lever t. This movement of shaft 20 also returns the controller handle to mid-position through the medium of the levers l, i Fig. 3. This movement of the lever 47 may also operate a switch which opens the main circuit and cuts off the power. The emergency brake lever is operated automatically in the event of the failure of current supply by a lever 22 operated by a falling weight set in motion by the de-energizing of a solenoid, and in the event of loss of air pressure in the brake system the same lever 22 is operated by a second weight which is released by a piston. In the event of an overwind, the lever 22 and shaft 26 are operated by a projection 34, Fig. 6, on the main cam m, Figs. 3 and 6. The re-setting lever 40, Fig. 6 can be operated to rotate the shaft 20 through the linkage 46 and thus restore the weighted bellcrank 19 to the " off " position. The lever 40 also is used to position the projection 34 to vary the point at which the brake is applied in overwinding.