US500927A - Frederik mohr - Google Patents

Description

(No Model.) P. MOHR.

' BRAKE FOR GUN GARRIAGES.

-\ 1&0. 500,927.

Patented July 4, 1893.

FREDERIK MOHR, OF

PATENT QFFIQE.

MAGDEBIIEG-BUOKAU, GERMANY, ASSIGNOR TO THE GRUSONWERK, OF SAME PLACE.

BRAKE FOR cuN-o AamAcEs.

SPECIFICATION forming part of Letters Patent No. 500,927, dated July 4, 1893. Application filed October 6, 1892. Serial No. 447,894. (No model.) Patented in Belgium May 13, 1892, No. 99,673.

To all whom it may concern:

Be it known that I, FREDERIK'MOHR, a subject of the King of Denmark, and a resident of- Magdeburg-Buckau, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Brakes for Gun-Carriages, (for which I have obtained Letters Patent in Belgium, No. 99,67 3, dated May 13, 1892,) of which the following is a [O specification.

My. invention relates to a brake for guncarriages which is particularly adapted for use upon wheeled gun-carriages.

The object of my said invention is to pro- 1 5 vide upon the gun carriage a simple and efficient brake which engages with the ground, and offers to the recoil a resistance which is automatically proportioned so that it may never cause the gun to jump.

According to the said invention the im proved brake has a spur, arranged preferably on the trail of the gun'-carrii* e set as to be forced into the ground andincre'ase the frictional'resistance to the recoil. The{resistance is kept constant foran-y particular state of the ground by means of a'special device hereinafter fully explained.

- In order that my invention may be clearly understood I will now proceed to describe 0 the same with reference to the accompanying drawings in which- Figure I is a side elevation of the end of the trail of a gun to which an improved brake according to my said invention is applied, and Figs. II and III are longitudinal central sections through the ends of other trails, to which alternative forms of the said improved brake are applied.

Like letters indicate corresponding parts throughout the drawings.

With reference first to Fig. I, B is a spur adapted to turn upon a bolt 0 fixed in the trail of the gun-carriage, and provided with an arm I). F is a spring secured to the trail with one of its ends arranged to bear upon the arm I). f is an adjusting-screw bearing upon the other end of the spring, and capable of being adjusted in a suitable bearing in the trail to vary the compression of the spring and the pressure on b. -When the gun is un limbered, the spur B is forced into the ground by that part of the weight of gun and carriage, which rests upon the trail of the guncarriage. The said spur enters more or less deeply into the ground according to the na- 95 ture and condition of the same and is driven in still farther during the firing. During the recoil the spur B cuts a furrow in the ground, the length of which represents the minimum I recoil reached under the conditions chosen. When succeeding rounds are fired this furrow is lengthened, as the shortness of the same ren ders it superfluous to run the gun up to the original position for firing. The device so far as it has been described would control the recoil upon ground of a certain kind, if a fixed spur of suitable proportions were chosen. But

if a gun-carriage provided with such a fixed spur were brought upon firmer ground, for em ample,jumping of the gun would soon occur,

in the firing, as the resistance of the spur to the recoil would exceed the admissible limit. It

is to permit of the regulation of the resistance offered by the spur, that, as hereinbefore de= scribed it is pivoted upon the axis 0, and the 7 5 power of the spring F Lsuch that in the recoil there will be a turning movement of the spur B upon the axis 0 at the moment when the press ure of the wheels upon the ground becomes approximately nothing. When the spur B turns, So its depth of penetration decreases, and thus, also, the resistance which it ofiers to the re-' coil. Accordingly the said brake apparatus adjusts itself, in each case automatically, as the brake spur turns exactly as far as the re- 8 5 sistance of the ground demands. The wheel brakes of the gun carriage therefore become superfluous for preventing recoil although they may of course be retained for other purposes. The power of the spring E which is go required for the purpose can be readily cal-'. culated without difficulty and can moreover be regulated by the adjusting screw, while the most favorable dimensions of the spur B can best be determined by experiment. In lien 5 of the spring F weights could be arranged to bear upon the spur B, but it is undesirable to increase the weight of the gun-carriage, by employing weights in this manner. As an-' other alternative other pressure may be emroo ployed to bear upon the spur by any suitable means, If it be desired to still farther decrease the recoil at the expense of slight jumping of the gun-carriage, it is only necew sary to increase the compression of the spring sufficiently.

In the arrangement shown in Figs. II and III the spur, for reasons hereinafter set forth, need not be made of a length and Width to render it suitable for use in the softest ground. With reference now to Fig. H, K a screw which bears upon a portion of the trail and passes through a block B to which the spur is rotatably secured. By employing the said screw to move the block, the spur can be adjusted so that it protrudes more or less from the trail of the gun carriage. It is thus adjusted when in use, thereby enabling the resistance of the ground to act upon a greater or smaller surface of the spur and its mean effective leverage to be varied.

In Fig. III is shown an arrangement in which the spur is also automatically adjusted vertically according to the nature or condition of the ground. In this modification the pin 0 on which the spur turns is carried. by an arm or frame N arranged to turn about the second bolt L which is fixed in the trail of the gun- A spring M presses upon a part of c said arm or frame. to the resistance of the ground and spring M the spur is forced 111011501 less deeply into the same. 0 is a stop by which the downward movement of the arm or frame is limited.

To determine the dimensions of the spur let the assumption be made that it is entirely sunk in loose ground in a vertical position and that the gun is fired in the lowest position of depression. The resistance offered by the spur to the recoil of the gun must then be such that jumping of the gun round the trail of the gun-carriage is just prevented or is confined to definite admissible limit. In general only the first case will have to be taken into consideration, that is to say the recoil will be limited only to such an extent that jumping of the gun is just avoided. If this condition is fulfilled the pressure of the Wheels upon theground will be approximately ml at the moment of the firing, and the presse gun-carriage upon the mum.

As hcreinbefore stated the construction of such improved object in the brakes is to bring the resistanceotferod by the spur to.

in; the bouncing of the gun. The designer will have to decide first how nearly it is desirable to approach the attainable minimum of the recoil.

Having now particularly vention, what I claim isl. The combination with the trail of agun, of a spur hinged thereon and projecting do\vn Ward for insertion into the ground, and a spring having one end fixed and the other end adjusted to oppose the turning of said spur on its hinge substantially for the purpose explained.

2. In a brake for a gun. carriage the combination with the trail, of a hinged spur projecting downward therefrom and suitable means for adjusting the position of the hinge on the trail, substantially as and for the purposes specified.

3. In a brake for a gun-carriage the combination with the trail, of an arm or frame pivoted to the trail, and havinga spur projecting therefrom and a spring on the trail adjusted to resist the swinging movement of said arm or frame on its hinge, substantially as and for the purposes specified.

4. in a brake for a n of the trail, a g

the trail and having an expring between said extension trail, as and forthe described my intension, and a s and a fixed portion of the purpose specified.

5. In a brake fora gun-carriage, the combination of the trail, a pivoted spur, a spring hearing at one end upon'the spur and resisting its swinging movement, and a screw threaded in a fixed part and engaging the other end of said spring, all substantially as and for the purposes set forth.

6. In a brake for gun-carriages the combination of the trail, the pivoted spur, means for adjustably securing the pivot of the spur on the trail, and the spring mounted on the trail and bearing against the spur, substantially as and for the purposes set forth.

'7. In a gun-carriage the combination of the trail a frame pivoted on the trail, a spur pivoted in said frame, a spring also carried by the frame and bearing against the spur for keeping it in vertical position, and a spring carried by the trail and bearing on the pivoted frame for holdin g it down with a yield ing pressure, all substantially as and for the purpose set forth.

' FREDERIK MOIIR.

Witnesses:

HERMANN LUBowsKI, EMIL KALLNEoKnn.

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