US1417922A - Device for adjusting the recoil length of fluid brakes for gun carriages - Google Patents

Description

N.. KOCH. DEVICE FOR ADJUSTING THE RECOIL LENGTH OF FLUID BRAKES FOR GUN CARRIAGES.

Patented May 30, 1922.

APPLICATION FILED FEB 3, 1915- i3 if (a NOBBEB'I KOCH, OF ESSEN-RELLINGHAUSEN, GERMANY, ASSIGNOR, BY IVIESNE ASSIGNMENTS, TO THE ALIEN PROPERTY CUSTODIAN.

DEVICE FOR ADJUSTING THE RECOIL LENGTH OF FLUID BRAKES FOB GUN GARR'IAGES.

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Specification of Letters Patent.

Patented May 31), 31922.

Application filed February 3, 1915. Serial No. 5,900.

To aZZ whom it may concern Be it known that I, Nonnnn'r K001i, residing at Essen-Fellinghausen, Germany, a citizen of the German Empire, have invented a certain new and useful Improvement in Devices for Adjustino' the Recoil Length of Fluid Brakes for un Carriages, of which the following is a specification.

The present invention relates to fluid recoil brakes for gun carriages of the same character as those described in the copending application for Letters Patent Serial No. 822,656 filed March 5th, 1914, that is gun carriages having a device for adjusting the recoil length according to the elevation of the gun and tor varying the crossv section of the fluid passages. The object of the present invention is now the further improvement of such devices.

One embodiment of the present invention is illustrated in the accompanying drawing where- Figure 1 shows a longitudinal section of the brake piston and a portion oi the cylinder;

Figure 2 a section along line 2-2 of: Figure I seen from the left;

Figure 3 a section along line 3-3 of Figure 2;

Figure e a section along line 4- & of Figure 3, seen from the left;

Figure 5 a section along line 5-5 of Figure 1 seen from the lett;

Figure 6 a section along line 66 of Figure 3 seen from the left and Figure 7 a diagrammatic representation of the brake in smaller scale.

The piston head B having a hollow chamber b and a piston rod B is guided in the brake cylinder A. On the inner wall of the brake cylinder A are out two pairs of longitudinal grooves a and (6, which follow a screw line of such pitch that one end of each groove is displaced relative to its other end an amount which corresponds to the width of the groove in question. The grooves a have about twice the width of the grooves a F or connecting the grooves a and a with the fluid in frontand rear of the piston head B, are provided two pairs of apertures b 7) in the piston head having the same width on the cylindrical surface of the piston head as the grooves (4 measured transversely to the longitudinal direction of the brake. To insure that the fluid only proceeds by way of the apertures Z9 b from one side to the other of the piston head, there are provided on the latter two revoluble but non-:-;lidable rings C, (1' having studs 0 and engaging in the grooves a and a and being secured in place by means of nuts 2 and Z).

When the apertures 6 7) have the position shown particularly in Figures ,5 and 7 relative to the grooves a, a corresponding to the hatched position 1 in Figure I", the recoil oi the piston B taking place in the direction of the arrow 0;, the brake fluid then proceeds from the piston rod side of the brake cylinder through the grooves a and a and the apertures 0 Z) to the other side covered by the inner wall of the cylinder, see

position II in Figure 7, no more fluid will then be able to pass. The recoiling parts will therefore be arrested. This, however, takes place only after the piston has completed its full (normal) stroke, that is the longest recoil, as a consequence of the size of the grooves 64 and In the above described setting of the brake, the area of the orifice for the brake fluid is, towards the end of the recoil, comparatively great, so that the brake pressure does not exceed the amount, which is permissible for the rapidly decreasing stability of the carriage during the recoil of the gun under slight elevation.

If a recoil is desired, the length of which amounts to about hali of the normal length, the piston rod has then to be turned by hand or automatically in the direction of the arrow 3 Figure 5, an angle which corresponds to the width of the grooves 54 The apertures b are then completely covered by the inner wall of the brake cylinder, Whilst the apertures take the position relative to the grooves (6 represented by dot and dash lines in Figure 6. In Figure 7 is the corresponding position of the apertures indicated by III. For the transmission of the brake fluid at the beginning of the recoil is then only available the sectional area formed by the apertures 6 which, during the recoil be come gradually restricted, and at last completely closed, when the apertures b have reached the position relative to the grooves a denoted by IV in Figure 7. As no transmission of the brake fluid is any longer pos sible, the moving parts will become arrested.

As consequence of the covering o1 the apertures b by the inner wall of the brake cylinder, it has been attained that the sectional area for the brake fluid during the shortest recoil is less than during the long est recoil. The shape of the apertures 77* has therefore been so selected, that when these apertures have been closed, the recoil energy will be completely exhausted.

Besides the normal recoil length and the one which will obtain with the last described setting of the brake, it will be obvious, that any other recoil length between the permissible shortest and the normal length, may be had, by corresponding adjustment of the piston rod. I

I claim l. A device for adjusting the recoil length in fluid recoil brakes, having a piston and a part cooperating with the piston, said part being providedv with a primary helical groove and .a secondary helical groove, and said piston with a primary aperture and a secondary aperture corresponding, respectively, to said primary and secondary grooves; said primary groove and aperture operating during all recoil lengths, and said secondary groove and aperture being of less cross sectional area than the aforesaid primary groove and aperture, and being out of operation during the shortest recoil.

2. A device for adjusting the recoil length in fluid recoil brakes, having a piston and a part cooperating with the piston,.said part being provided with a primary helical groove and a secondary helical groove, and said piston with a primary aperture and a secondary aperture corresponding respectively, to said primary and secondary grooves; said primary groove and aperture operating during all recoil lengths, and said secondary groove and aperture being out of operation during the shortest recoil; said primary groove being approximately twice as Wide as said secondary groove.

A device for adjusting the recoil length in fluid recoil brakes, having a piston and a part cooperating With the piston, said part being provided with a primary helical groove and a secondary helical groove, and said piston With a primary aperture and a secondary aperture corresponding, respectively, to said primary and secondary grooves; said primary groove and aperture operating during all recoil lengths, and said secondary groove and aperture being out of operation during the shortest recoil; said primary groove having greater pitch than said secondary groove. 7 r r 4. A devicei or adjusting the recoil length in fluid recoil brakes, having a piston and a part cooperating with the siston, said part being provided with a primary helical groove and a secondary helical groove, and said piston with a primary aperture and a secondary aperture corresponding respectively, to said primary and secondary grooves; said primary groove and aperture operating during all recoil lengths, and said secondary groove and aperture being out of operation during the shortest recoil; said primary groove having approximately double the Width of and a greater pitch than said secondary groove.

5. A device for adjusting the recoil length in fluid recoil brakes, having a piston and a part cooperating with the piston, said part being provided with a primary helical groove and a secondary helical groove, and said piston With a primary aperture and a secondary aperture corresponding, respectively, to said primary and secondary grooves; said primary groove and aperture operating during all recoil lengths, and said secondary groove and aperture being out of operation during the shortest recoil; said primary groove having approximately double the Width of and a greater pitch than said secondary groove; said primary and secondary apertures having the same transverse Width as the secondary groove.

The foregoing specification signed at Barmen, Germany, this 16th day oi Dec,

NORBERT KOCH. [It s] In presence of- HELEN Nnrnn, ALBERT NU'FER.

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