DE150389C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates to a safety device for hoisting machines which automatically one during the last part of the upward movement of the conveyor cage Deceleration of the machine speed caused by the brake for the case being that the machinist does not set the speed of the machine to normal gear should have decreased.

The invention is based on the known arrangement based on that if the conveying speed is too high in the last part of the conveying path an electrical way (by closing a circuit or the like.) an attraction the brake for the hoist takes place.

The essence of the new device is that on one by the regulator moving carrier circuit breaker parts are stored, which can be moved into the path of the depth pointer and electrically connected to the solenoid causing the brake to be released are. If, therefore, if the speed is too high, the depth indicator hits one of the circuit breakers at the end of the conveying path, so becomes the circuit including these breakers and the electromagnet interrupted and causes the application of the brake, which enables the Conveyor tray arrives at the hanging bench at normal speed.

The pressure on the brake shoes brought about by the new device is complete regardless of the usual movement of the brake at the end of the rope journey. the The strength of this pressure is precisely regulated by a counterweight, which is placed on the acts on the lever system connected to the brake shoes. The new device will created an auxiliary resistance for the machine from a point of ascent, which is the further away from the hanging bench, the greater the speed of the Machine at the arrival of the hoist trays on this last part of the climb.

It is therefore not a stopping of the conveyor trays, but a delay their speed, which the former the arrival of the conveyor trays on the hanging bench permitted under normal conditions.

The innovation is illustrated by the drawings in one embodiment. 'Fig. Ι shows the overall arrangement of the new device on a hoisting machine known Design type.

Fig. 2 shows in partial section and on a larger scale the parts of the circuit breaker in the off position.

A speed controller 1 (Fig. 1) is driven by the hoisting machine, with the mediation of a lever system 32 a rocker arm 2 of a special device twisted. This rocker 2 carries around pins 4 rotatably arranged stops 3, which in the Path of the pointer 33 (of the depth pointer) indicating the position of the conveyor cage can be engaged when turning the rocker ■. When the speed is reduced the machine is out of action within the normal limits; however, the speed when approaching

Claims (1)

If the conveyor cage to the hanging bank is unacceptably high, the regulator will cause the forward movement of the rocker arm 2 in the path of the pointer 33 ~. If the pointer 33 (FIG. 2) consequently hits one of the stops 3, it swings about its axis and lifts the striker 5 (position according to FIG. 2), which slides freely between two guides 41, 42 of the rocker 2. This also lifts the arm 9 attached to the striker 5, so that the contact 43 moves away from the contact 44 and the current flowing through the line 6, 7 is interrupted. The greater the speed of the machine, the closer the rocker 2 approaches the path of the depth pointer 33, and the faster the latter hits one of the stops 3 of this rocker. In other words, the greater the speed of the machine, the greater the machine's deceleration when the conveyor pan arrives at the last part of the climb. Usually the striker is in its lowest position, in which the arms 8 and 9 are held against one another by the spring 45 and the contacts 43,44 touch so that the current from the line 6 through the breaker into the line 7 can reach. This current then excites an electromagnet and its interruption causes the core of this electromagnet to fall, this movement then being used, with the aid of suitable means, to cause the brake to be applied. This engagement takes place by opening the valve 20, so that the piston 22 no longer holds the counterweight 34 raised, which therefore lowers as a result of its own weight and, by means of the lever system 40, causes the brake shoes to be pressed on. Instead of bringing about this effect by interrupting the current, it can do so can also be achieved vice versa by closing the stream. The electromagnet can be replaced by a small electric motor of the appropriate construction that would serve the same purpose and use less electricity than an electromagnet. In this case, an AC motor of any type is used Use, which is in a certain direction as a result of the current supplied to it seeks to rotate and is stopped in its rotation by a stop or similar resistance. Pa te ν τ-Α ν saying: A safety device for hoisting machines, at which if the conveying speed is too high in the last part of the conveying path by interrupting a electrical circuit the deceleration of the machine speed is effected by braking> characterized in that the circuit breaker parts (3) are rotatably mounted in a rocker arm (2) are, which is rotated by a regulator, such that at too high a speed At the end of the conveying path, the depth pointer hits one of the circuit breakers (3) which the striker (5) lifts and thus causes braking by interrupting a circuit, by which the deceleration the greater the machine speed, the greater the distance from the hanging bench the speed of the machine when the conveyor pan arrives at this last one Part of the climb is. 1 sheet of drawings,