US1314659A - James huber - Google Patents

Description

1. HUBER. l AUTOMATIC RRARE FoR suRMARlNE MINE ARcRoR cALE nRuMs.

APPLICATION FILED OCT. 3.19I7. 1,3 14,659, f Patented Sept. 2, 1919.

N 'N R JWM narran sfia'rns Parana? onnioii.

JAMES HUBER, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO VICKERS LIMITED,

0F WESTMIN'STER, ENGLAND.

Y VAU'.lOlVlA'JIG BRAKE FOR SUBMARINE-MINE-ANCHOR CABLE-DRUMS.

T0 all whom t may concern Be it known that I, JAMES HUBER, a citizen of Switzerland, a resident of thecity of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new anduseful Improvements in Automatic Brakes for Submarine-Mine-Anchor Cable-Drums; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable-others skilled in the art to which it appertains to make and use the same.

This invention relates to an automatic brakeY for submarine mine anchor cable drums.

l/Vhen a submarine mine'is launched from a vessel going` at high speed, it will be carried into the wash of the propeller and unless some means is provided forcontrolling the rotation of the cable drum, the cable will overrun itself and a snarling of the cable will result. y

It is an object of the present invention to provide means for preventing Ythe overrunning of theI cable and the consequent snarling of the same, especially when the mine is launched from-a vessel going at high speed.

It is a further object of the invention-to provide means-which willcontrol the paying out of the cable as the anchor descends in the water. l l y These results are brought about broadly by providing means which will retard the rotation of the cabler drum with a force proportional to the force which tends to rotate the drum. 1

I have illustrated in the drawing one embodiment of the invention which, however, may be-modiied to a considerable extent and still produce the results above set forth.

'Figure ljis a fragmental sectional view of a submarine mine, illustratingthe invention applied to the mine anchor.V

Fig. 2 is a fragmental elevationlooking at the ends of the brake arms, and

Fig. 3 is an enlarged detail of the end of one of the brake arms and a portion of the brake drum.

in die drawing ai@ mine is indicated by the reference character 1, with which the mine anchor 2 is associated. This anchor includes the usual mooring cable drum 3 from which the mooring cable L extends. It is, of course, to be understood that, as the anchor moves away from the mine, the

Specication'of Letters Patent.

Patented Sept. 2, 1919.

applicati@ flied october 3, 1917.v serial irdfieaase.

mooring cableunwinds from thev cable drum 8, but the force whichtends to'rotate the cable drum naturally varies as the cable pays out from the same. For instance, when the drum contains three hundred feet of cable, the distance. from the point where the cable begins to unwind to the 4center of. the drum spindle is a predetermined amount. However, as the' cable pays out from the drum this distance is gradually reduced and consequently the leverage is reduced. As the cable unwinds from the drum the tendency of the drum will be to rotate at a greater rate of speed, obviously.

The end of the drum spindle 5 is provided with flat faces, as'at 6, and pivoted to vthis end by suitable means, such as a bolt 7 is a pair of brake arms 8. The number of these .brake arms is not important as they maybe increased or decreased at will. The pivot of these arms extends transversely of the axis of rotation of the cable drum, so that upon the rotation of the cable drum the ends of the arms tends to move outwardly under the action of the centrifugal force developed and against the action of the spring, later described, so that the latte-r gradually loses its effectiveness.

y They ends ,gf these arms are somewhat enlarged to form, what I will term, brake shoes, the faces 10` and 11 of which converge, asillustrated in Fig. 3 of the drawing. These arme are normally pulled together by suitable means, such as a spring 12, which is attached to eyes 13 onthe arms sol that the faces 10 and 11 of the shoe portions of the arms engage correspondingly shaped faces 14: and 15 on a brake drum 16. This 'brake drum is secured to the side of the mine anchor in the embodiment illustrated, is circular in form and has its center arranged in axial alinement with the spindle V5, so'that upon the rotation of the cable drinn and the consequent rotation of .the brake arms 5, the faces 10 and 11 will continuously contact with the faces 14 and 15 of the brake drum until the speed of rotation is such as to move the arms outwardly. It is to be understood that it is contemplated that the brake drum may be secured to the anchor in various other locations and the brake arms may be associated with the cable drum iii various other relations, the important requirement being that the brake drum be stationary with relation to the cable drum and that the brake arms rotate with the cable drum. The face 11 of each of the shoes 9 is flat, `is `'also the corresponding face 15 of the brake drum 16. The face y10 of each :of the yshoes 9 is, however, curved, as illustrated in Fig. 3, the center of curvature being the centerof the pivot 7 of the brake arms 8. The face l14 of the brake drum isf'likewise-curved and the center of curvature is the center of the aforesaid pivot 7. It will 'thus kbe seen that the concave face of each of the shoes 9 engages the corresponding convex vface 14 of the brake drum,'thus when the arms 8 move outwardly Aagainst the action of the spring 12, the shoes will remain in contact withthe face 14. Y y

In order that vtherefmay `be no jamming of the brake shoes 9 so as to prevent vthe perfect contact ofthe :faces of the shoes-and the faces of the drum,'the drum is *provided with an'annular recess v17 which is formed centrally ofthe drum so that the apeX of each of the shoes'will extend into the same.

Vhen-the cable begins to pay out from'the drum, the greatest leverage is present and at this time the shoes are in engagement with the faces-of the brake drum, and the springlQ exerts its greatest forceonithe arms 8. As the leverage decreas'es,`the speed'of rotation of the cable drum increases andthe arms 8 move outwardly under the action ofthe centrifugal force developed againstthe'tension of the spring 12, so the effectiveness of the latter is'gr'adually reduced. Hpwever, as the face 10 of each of the shoes remains in engagement withthe face 1:4 of' the brake drum, the shoes continue lto act as a brake to the cable drum, but in viewof /tlie decreased effectiveness ofthe spring 12, the pressure exerted by the shoes on the brake drum is naturally less'so thatthebraking eect decreases'in proportiontothe'decrease of the leverage or the decrease of the force tenidino` to rotate the cabledrum.

'Vhile =I have illustrated aparticular embodiment of my invention, as -has been stated, I contemplate various changes in'the details of construction andth'erefore do not wish to be limited to the particularV embodiment shown.

`What Ivclaim is: p

1. The combination with a submarine mine anchor including a cable drum, of means for braking the cable drum with Va'decreasin'g 3. The combination with a submarine mine anchor including a cable drum, of a brake drum, an Iarm pivoted to the cable Ydrum spindle and 'having a variable surface contact with the brake drum, whereby Vupon the pivotal movement of the arm the 'degree ofsaid surface contact will be varied.

4. The combination with a submarine mine anchor including'va cable drum, of a friction drum associated therewith, an arm pivoted to the'f'cable drum spindle on an aXis transverse 'of the same and having a portion engaging the brake drum, and resilient means tending tovholdthe arm in engagement with the drum.

A5. YThe combination with a submarine mine anchor including a cable drum, of a brake drum lstationary with relation to the cable drum, a-brake armfpivoted to the cable drum spindle on an axis 'transversely of the latter and adapted to rotate therewith, said arm having -a shoeon the end thereof arranged to engage a Aface vof the brake drum, the engaging faces of said shoe vand brake drum being so disposed that upon the pivotal movement of the brake arm the shoe will move on the brake drum, and means tending to 'maintain the shoe in contact with the faceofthe brake drum with varying pressure.

1'6. The combination with a submarine mine anchor lincluding 'a cabledrum, of a brake arm pivoted to the cable drum -spindle transversely thereofand having a shoe on its end, said shoe having one of its faces curved transversely, the center of curvature being the pivoted point of the arm, a brake drum stationary with `respect 4to the cable drum'fhaving a circular face co-aXial with the cabledrum spindle, said face being transversely curved, theicenter of curvature beingthe'fpivoted point of the brake arm, and means tending to'hold the curvedface of the shoein Iengagement vwith vthe curved face of the brakedrum` with varying pressure.

In: testimony whereof IlaiiiX myl signature.

JAMES HUBER.

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