DE123817C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

JVi 123817 CLASS 5d.

Patented in the German Empire on October 10, 1899.

When reversing hoisting machines, the control lever is disengaged from the middle rest position into the forward or backward position required for the control greater resistance, which results from the steam load on the control valves and from the resistance of the external control organs of the machine. While the former stops after the valves are lifted, the latter only increases as the valve progresses Gradually release the control lever.

This variability of the resistance is taken into account by the lever mechanism shown in the drawing. The mechanism consists of the actual control lever 5 with the fork lever 5 and the two-armed link lever L. Instead of the link lever, a load carriage with two links can also be arranged.

The two forks 5 of the fork lever work for forward and backward control in the arms / of the link lever L. During the reversal, the setting that works every time, according to the progressive deflection of the control lever, is directed more and more towards the deflection circles of the lever heads s central.

This way of working of the lever system corresponds to the same deflection angles of the Control lever initially small and steadily increasing as the control lever is extended Increasing deflection angles of the link load lever.

The forces of the control resistance are transferred to the control lever so favorably that when reversing initially, i.e. with the greatest resistance, only the smallest force on the control lever is necessary and that only when the control lever L is extended further does the resistance, which continuously decreases, slowly increasing ratio acts on the control lever.

The essence of the invention consists in the combination of a slot lever mechanism with a fork lever mechanism, whereby a double-acting reversing with alternating load for hoisting machines is created. The difference from this the essence of the subject matter of patent 76859 is the union of a slot lever mechanism with a friction ratchet, for the purpose of turning a part of the machine in a direction that is passed through each time Activation of the locking mechanism is prepared.

With the lever of patent specification 80866, as with the lever of the present one Invention a constant resistance force on the load lever by means of the control power lever be overcome in such a way that in or near the central display there is less force is necessary than close to the full display. The means, however, are necessary to achieve this same Purpose are used are different. Whereas in patent 80866 the length of the load lever is changed while the length of the power lever remains the same, the lever runs the current one Invention, the length of the load lever remains unchanged while the length of the load lever remains the same. If in the Lever system of the new invention in place

Claims (1)

of the double-armed control lever S, the intermediate _{lever S 1} (Fig. 4) is considered, the power lever length changes with the load lever length remaining the same. In one arrangement, therefore, the essential thing is the variability of the load lever length, in that the load lever pin q (Fig. 2) is positively guided in the load lever on the permanently attached slot track by means of the control lever and the length of the load lever is thereby changed according to the design of the slot track, while in In the other arrangement it is immaterial whether the load or the power lever length are changed individually or both. There is also no fixed guideway. The slots of the intermediate or link lever are not absolutely necessary for the interlocking of the cooperating levers; they are avoided in the slide arrangement (FIG. 5). The mode of action of the two levers is also different. In the subject matter of patent specification 80866, the constant load lever load Q acts on the control lever independently of the display, in the ratio of the respective load lever length to the same force lever length. It is therefore always K = Q- ¹ - (Fig. 3). The transmission ratio is completely independent of the size of the deflection angle α and only conditionally due to the shape of the fixed guideway F, in that different points of the guideway are reached by the load application pin q when the control lever S deflects differently. The lever arm is thus of different sizes. In the present invention, the constant load lever load Q acts on the control lever S according to the decomposition of forces under the direct influence of the angles (α + β), the size of which corresponds to the respective position of the control lever S (FIG. 6). , It is always K = Q cos (et + ß). In the tangent position of the cooperating levers the force to overcome the load Q is zero, while in the central position of the lever the force K is equal to the load Q and in the intermediate positions of the lever the force K is a part of the load Q which varies in size (Fig 7). This transmission ratio is directly dependent on the size of the angle (α + β) and is therefore a direct function of the deflection angle of the control lever S, without a fixed or even a guideway being able to come into consideration. Pate ν τ-Α ν SPRU c H: Control handle for carriers, unequal at the same force lever travels load lever paths correspond, characterized in, that the power lever (S) by means of two pins (s) sitting on a fork of the lever (S), in such a way in two slots (I) of a rocker arm or - Slide (L) engages so that one of the pins (s) is always located in the associated slot (I) of the link lever during the forward and reverse control and actuates it. For this. 1 sheet of drawings.