DE266621C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 26662! CLASS 42 or GROUP

MAX O. HOEFT in BERLIN. Speedometer with pump.

Addendum to patent 264826.

Patented in the German Empire on December 13, 1912. Longest duration: August 24, 1927.

The invention relates to a speedometer as described in the main patent 264826 characterized by the changes caused by temperature changes in the nature of that conveyed by the pump into the accumulator or display cylinder Fluid takes into account that the flow rate of this fluid through a heat-sensitive body is regulated. To this end, the thermosensitive influences Body in the main patent, the suction period, in such a way that the pump increases when the temperature increases Reduction in temperature promotes less fluid.

Now, according to the present invention, the control of the delivery rate is to be achieved thereby that there is a in the pressure line, namely between the pump and display cylinder ' provided outlet opens and closes depending on the nature of the conveying fluid.

Furthermore, as tests have shown, the nature of the fluid (oil) that is most likely to be considered does not change evenly with temperature changes, but apparently more intermittently, so it is for speedometers that operate at very different temperatures (about -τ- 20 to - (- 50 ° C.) have to work, it is necessary to provide calibratable devices (thumb disks or the like) that allow the flow cross-section to be regulated within the broadest limits and in different proportions to the speed change.

This goal can be achieved in a number of ways. There are some in the drawing Embodiments shown for example.

In the embodiment according to Fig. 1 and ia are on the pointer shaft a, which is rotated by the accumulator piston b through the intermediary of the rack c and gear d, several thumb disks e , which serve as stroke limit stops for lever f , which on the 'of the Exhaust valves g mounted shaft h rotatably seated. Prior to these levers f are the k on the shaft i attached thumb wheels, adjustable pins o. The like., The i upon rotation of the shaft, the respective temperature according to m by the thermal membrane I through the agency of the gears and carried η, the lever f ' move one after the other by a small angle so that their upper ends reach under the thumb disks e and offer the valves g a respective limit stop, the position of which is determined by the calibrated shape of the disk β acting at the temperature in question.

Also in the embodiment according to FIG. 2 α e thumb wheels are mounted on the pointer shaft, but which form stops g for multiple valves. Depending on the temperature, more or fewer valves g are switched on.

This is done by the slide o, which is moved by the thermal membrane I. In the position of the slide ο shown in FIG. 2, only one valve g is open. When the temperature drops, the slide is ο through the thermal membrane / or the like. moved further to the right, whereby the second, possibly the third, etc. valve is switched on.

Of course, the arrangement can according to

ίο Fig. 2 are designed so that only one valve remains in effect, which is adapted to the nature of the oil at the appropriate temperature. In this case, the slide receives ο an annular groove or a passage opening which is brought under the various valves by moving the slide axially.

The embodiment according to FIG. 3 shows a stop drum e on the pointer shaft α , which is under the influence of the spring p and can be displaced by the thumb disk k. This is moved by the thermal membrane I. Depending on the respective temperature, the drum e is shifted by the thermal membrane I on the shaft α , so that the valve g is offered a different boundary surface.

Instead of moving the stop drum e through the thermal membrane I , the valve g can also be moved. For example, the valve together with the housing is a hollow pin q be pivotally mounted, 5, as shown in Fig., Or kannTdas valve 'carry a pivotable joint piece at the upper end, which is obtained by the heat-sensitive body I o. The like. In the longitudinal direction of the drum e is moved and is brought into contact with other parts of the drum.

Fig. 4 shows an embodiment which is similar to that of Fig. 4 of the main patent, only here the outlet is provided in the pressure line. The piston r under the influence of the pressure medium. is alternately moved up and down by the continuously rotating piston s, cams or the like, whereby it opens and closes the opening t. The shaft u carrying the thumb s is moved axially by the thermomembrane I with the mediation of the calibrated thumb disk w depending on the temperature.

Claims (8)

Patent Claims: ■ ■ I. Speedometer with pump according to patent 264826, characterized that the flow rate is regulated through an outlet provided in the pressure line in front of the display cylinder, its opening cross-section or opening duration depending on the nature of the fluid for all of them Temperatures of stop surfaces influenced by a heat-sensitive body is limited. 2. Speedometer with pump according to claim 1, characterized in that the opening cross-section or the opening duration is influenced not only by the heat-sensitive body (V), but also by the pointer shaft (a) depending on its angle of rotation. 3. Speedometer with pump according to claim 1 and 2. "characterized in that from the pointer shaft (a) several thumbs, disks (e) o can stand under the influence of a heat-sensitive body (V) and regulate the outlet depending on the respective temperature. 4. speedometer with pump according to claim 1, 2 and 3, characterized in that there are provided between the serving as limiting stops thumb discs (e) o. The like. And the outlet valve (g) (or its multiple) rotatable lever (f), the When the temperature decreases, the heat-sensitive body (I) is brought into engagement one after the other with the thumb disks (e) or the like (Fig. 1 and ia). 5. Speedometer with pump according to claim 1 and 2, characterized in that the pointer shaft (a) moves several thumb disks (e) or other calibration means designed according to the nature of the fluid at all temperatures in question, each of which is used to limit particular outlet valves ( g) serve, which are connected to the pressure line one after the other in any order by a heat-sensitive body (I) (Fig. 2). 6. Speedometer with pump according to claim 1 and 2, characterized in that the pointer shaft (a) serves as a limit stop thumb drum (e) o. The like. Moves, which is also influenced by a heat-sensitive body (V) , so that depending on the nature of the delivery fluid an outlet valve (g) is opened more or less for a given speed ■ 7. Speedometer according to claim 6, characterized in that not the thumb drum (e) moved by the pointer shaft, but the outlet valve / g) is moved by the heat-sensitive body (I) so that the valve (g) comes into contact with another part of the thumb drum (e ) depending on the temperature (Fig. 5). 8. speedometer with pump according to claim 1, characterized in that the outlet. (T) consecutively intermittently through a corresponding number of strokes of the pump rotated thumb (s) o. The like. Is opened and closed by said heat-sensitive body (I) is influenced in such a way that, depending on the nature of the delivery fluid, the outlet (t) is given a larger or smaller stroke (FIG. 4). 1 sheet of drawings.