US3005215A

US3005215A - Buoy and like floating object incorporating means for resiliently connecting same toits anchor

Info

Publication number: US3005215A
Application number: US814331A
Authority: US
Inventors: Rutger B Colt; Rudolph J Cerny
Original assignee: Bendix Corp
Current assignee: Bendix Corp
Priority date: 1959-05-19
Filing date: 1959-05-19
Publication date: 1961-10-24
Anticipated expiration: 1978-10-24

Description

Oct. 24, 1961 R B. COLT ETAL 3,005,215

BUOY AND LIKE FLOATING OBJECT INCORPORATING MEANS FOR RESILIENTLY CONNECTING SAME TO ITS ANCHOR 2 Sheets-Sheet 1 Filed May 19, 1959 PIC-1.1.

INVENTORS RUTGBR B. COLT UDOLPH d. CERNY u ATTORNEY Oct. 24, 1961 R B. COLT EI'AL 3,005,215

BUOY AND LIKE momma OBJECT INCORPORATING MEANS FOR RESILIENTLY CONNECTING SAME TO 11's ANCHOR 2 Sheets-Sheet 2 Filed May 19, 1959 FIG.5.

FIG. 4.

INVENTORS RUTGBR B. COLT RUDOLPH J. CERNY ATTORNEY United States Patent BUOY AND LIKE FLOATING OBJECT INCORPO- RATING MEANS FOR RESILIENTLY CONNECT- ING SAME TO ITS ANCHOR Rutger B. Colt, Baltimore, and Rudolph J. Cerny, Timonium, Md., assignors to The Bendix Corporation, a corporation of Delaware Filed May 19, 1959, Ser. No. 814,331 7 Claims. (Cl. 9-8) The primary object of the present invention is to provide a marking buoy or the like incorporating improved means for resiliently connecting same to its anchor in a manner such as to prevent flotation forces resulting from rough water, rise and fall of the tide, and strong currents from displacing the anchor and hence the buoy itself from its original planted position.

A more specific object is to provide a practical and conveniently transportable buoy and anchor combination embodying means whereby when the buoy is planted, it will remain at or close to its initially anchored position despite rapidly moving currents, rough water conditions and/or rise and fall of the tide. To attain this object, we provide a combined buoy and anchor package incorporating a compact constant-force spring mechanism acting on the anchor cable in a manner such as to minimize the efiects of buoy flotation forces on the anchor which might otherwise cause the latter to drift or walk and permit the marking buoy to drift from its initial marking position.

Specifications for making buoys, particularly those of the so-called time-delay type which are planted by being dropped into the water from air or water craft and remain submerged until the buoy is automatically released from its anchor, impose limitations on the size and/or weight of the package; and another object of the present invention is to provide a buoy incorporating a constantforce metallic ribbon spring and reel assembly for the anchor cable which may be coordinated with a rotatable cable drum or like cable storage member in a manner such as to permit the use of a spring and reel assembly of limited bulk and weight irrespective of the length of cable required to anchor the buoy when the latter is planted.

A further object is to provide a combination buoy and anchor combination package of the time-delay type in corporating constant-force spring means for the anchor cable which may be armed to become efiective automatically only after the buoy, following submersion, has been released from its anchor and has risen to within a predetermined depth with respect to the water surface. Briefly stated, the improved buoy and anchor combination comprises a marking float or buoy proper carrying a housing detachably supporting a contoured anchor member; and this housing defines a floodable chamber within which is located a cable drum or like cable storage member and an operatively related constant-force spring and reel assembly utilizing a spring of the socalled negator type, i.e. a pre-stressed metallic ribbon spring wound on a reel; it has a constant spring-force characteristic such that when the spring is unwound by drawingit from its reel, the torque opposing unwinding remains substantially constant throughout the effective length of the spring. If such a spring is rewound from a first reel onto a second reel arranged to flex the spring in a direction opposite the direction of flexure of the first reel, a constant torque will be exerted on the shaft of the second reel whenever it is driven in a spring-winding or unwinding direction. The second reel herein is rotatably mounted on the cable drum shaft, and means are provided for connecting the said second reel to the cable drum for rotation therewith after the cable has been payed out to Within a given distance of the length height such as to cause submersion of the package be fore the buoy is released from its anchor, the constantforce spring reel will be automatically clutched to the cable drum when the buoy rises to within a predetermined depth below the water surface.

In the drawings:

FIG. 1 is a view in elevation of a buoy and anchor combination in accordance with the invention;

FIG. 2 is a view similar to FIG. 1 but showing the anchor released from the marking buoy;

FIG. 3 is a view similar to FIG. 1 but showing the marking buoy and its associated mechanism housing broken away with parts in section;

FIG. 4 is a view in side elevation of FIG. 3 with a section of the housing removed; and

FIG. 5 is a view in section taken on. the line 5-5, FIG. 3.

Referring to the drawings in detail, a buoy housing 10 has a float chamber section 11 and a cable drum section 11; the latter being connected as by welding to the section 11, or both housings may be made as an integral unit. The top wall of the float section or chamber is provided with a socket 12, which is adapted to receive a mast 13, the buoy in this instance being of the spar type. Handles 14 are provided to facilitate handling of the buoy. The float chamber is packed with a buoyant material 15 although it could simply be filled with air.

The bottom wall 16 of the float section 11 has depending therefrom a series of

hanger brackets

17, 17' and 18, 18' for supporting the cable drum and constant-force spring assembly. The cable drum is indicated at 19; it is located in the chamber 20 defined by the housing section 11' and is secured on and rotates with a shaft 21, which at its outer extremities is mounted in bearings carried by the hanger.

brackets

17 and 17. (In certain installations, the cable drum remains fixed and the anchor cable is trained over pulleys mounted on the outer and inner ends of a rotating arm having its inner end secured on a rotatable shaft projecting from the center of the drum.) A series of reinforcing angles 20' line the wall of the chamber 20. A cable 22 is wound on the drum 19; it has an extension 22' to which it (cable 22) is connected by means of a swivel assembly 23, the said extension 22' in turn being connected to an anchor 24, which is preferably of generally concavoconvex shape and has its peripheral flange or rim contoured to engage seat 25, formed at the bottom of the housing section 11'. The anchor is preferably releasably connected to the housing section 11' by means of a plurality of slidable locking pins 26 (one only of which is visible in FIG. 3) which project from the free or movable ends of pressuresensing devices such as the spring-loaded bellows 27, which are anchored to the bottom wall of the housing section 11' by brackets 28. As will be obvious, when the bellows 27 are subjected to a predetermined pressure, they will collapse and release the locking pins 26, freeing the anchor 24 from its support. A guide roller 29 is provided for the cable 22.

A pair of so-called negator springs are indicated at 30 and 31. Each spring is originally wound on a

takeup reel

32, 32 and unwinds on an output reel 33, 33'. The take-up reels 3-2, 32' are mounted on

shafts

35, 36 journaled in the brackets .17, 18 and 17', 18', while the output reels 33 and 33' are rotatablyor loosely mounted 3. on the drum shaft 21 for the cable reel or drum 19. The springs on the take-up reels 32, 32' resist unwinding and hence the anchor cable is placed under spring tension; but regardlessof whether the spring is being pulled out or taken up as --a result of flotation forces increasing above or dropping below the torque exerted by the ne-gatorspring, the tension on thecable will remain substantially constant. As heretofore indicated, the

springs

30, 31 are made of pre-stressed ribbon steel and are wound'on their coactin-g reels in a manner such as to cause the spring to flex in opposite directions whenever a spring=,is"wound. on one reel :and unwound from its coactingreel. Springs of this type are known as negator springs and may be purchased in-the'open market. Thewindup torque exerted by thetake-up reels is of a value such as to permit the buoy to give and absorb the shocks of changes in flotation forces without transmitting forces of displacementmagnitude to the buoy anchor.

The cable drum 19 is releasably connected to the

adjacent output reels

33 and 33 by means of

locking pins

37 and 38, which project from the free or movable ends of'spring-loadedibellows 39 and 40, each anchored at its opposite end to aradially inwardly projecting member 41, carried by the peripheral wall of the drum. The outer-free ends ofthe

pins

37, 38 are adapted to engage in recesses 42., formed incam members 4-3, which may be secured to or form part of the adjacent side wall of the reels 33 and 33'. When the bellows 39 and40 are subjected to collapsing. pressure, the

pins

37 and 38 will be retracted, freeingthe cable drum 19 from its connection with the outputreels 33 and 33'. When the pressure drops below apredetermined value, however, the bellows will have expanded to a point where the locking pins engage in the recesses 42, whereupon the cable drum will be connected to

theoutput reels

33, 33" and be under the influence of the negator spring. The pin-contacting surfaces of cams 43are sloped in a direction to facilitate engagement of the pins 37, 38in the'recesses 42 during rotation of the drum.

A removable handle or crank 44 may be connected to the outer end of the cable drum shaft21 by means of a socket member 45', havinga locking slot 46, adapted to receive a pin 47, fixed in shaft 21, to enable the cable to be rewound manually whenever desired. The box indicated at 4-8 (mote -FIG. contains timing mechanism which may be ofan'y conventional type and forms no part of the present invention; it controls a locking pin 49 which is adapted to engage in a recess in the adjacent wall of the cable drum 19. A time-setting handle is indicated at 50. At will be obvious, the timing mechanism is for use in the so-called time-delay type of buoy; it may be set to release the pin 43 from the cable drum at a predetermined time after the buoy has been planted and allow the buoy to rise to the sunface'of the water. Obviously, if the pressure-

responsive locks

26, 27 are used in addition to the time lock, the anchor will not be released unlessthe buoy has sunk to a depth such as will cause the bellows 27 to collapse. Normally, the release depth would'be relatively shallow in a time-delay buoy, since the primary function of the pressure anchor lock when the time lock is used is to'hold the anchor stable untilthe buoy is planted. If a time iock is not used, the pressure locks serve -to"rel e a'se the anchor immediately when the buoy has sunk to a predetermined depth.

Operation While the buoy. as herein disclosed maybe considered of the all-service type, it has been particularly devised for service as a time-delay buoy, i.e.- one which when dropped from an aircraft,-for example, in the form of a package madeup of an anchor and buoy combined sinks tothebottom of a body of water and the buoy is subseouently freed from its anchor by time-controlled mechanism and rises to the surface, lire-following description of operation applies to a buoy of the time-delay type.

The buoy and anchor combination or package as shown in FIGS. 1 and 3 is ready for planting, the anchor 24 having been connected to the inset bottom wall of the housing 1 1' by the locking pins 26, the anchor cable 22 is fully wound upon its drum 19, the

negator springs

30, 31, or the major portions thereof, are wound upon the takeup reels 32 and 32', and the drum and

reel locking pins

37, 38 are projected outwardly into locking position; and it also may be assumed that the timer mechanism has been set to retract the locking pin 49 at some predetermined time. If the entire package is dropped into abody of water, it will sink to the bottom (assuming a reasonable depth); and during this brief period the pres' sure will overcome the bellows 27 and the locking-pins 26wi1l retract, freeing the buoy housing from its anchor.

The buoy or buoy housing now rises to a point where it takes up the slack on the extension 22, note FIG. 2;

and it will remain in this position'until the timing mech-- anism 48 retracts the locking pin 43. The collapsing pressure for the bellows 39, 4i) may be of a value such as will cause the locking pins 37 and 38 to be projected into drum-and-reel locking position whenever the buoy is at or above a depth of say 20 feet. Hence the said locking pins 37, 38 will retract whenever the buoy sinks below that depth and will remain retracted until after the timing mechanism operates and the buoy rises back up to within approximately 20 feet of the surface of the water. Thus as the buoy approaches the surface, following submersion and release of the drum by the timer mechanism, and the water-pressure in the chamber 20 drops below the spring setting of the

bellows

39, 40, the locking pins 37, 38 move outwardly and engage in the cam recesses 42, whereupon the cable drum is connected to the negator

spring output reels

33, 33" and the said drum comes under the influence of the constant-force spring action provided by the

springs

30, 31. The fully wound negator springs 30, 31 now partly unwind from the take-up

reels

32, 32 as the buoy continues to rise to the surface of the water, and the unwound lengths wind on the

output reels

33, 33.

When the buoy is riding at or near the surface of the water, any flotation forces resulting from fast currents, rise and fall of the tide, or wave conditions will tend todisplace the buoy temporarily from its marking position,- but it will always return to its marking area due to the wind-up torque exerted on the cable drum shaft by the negator springs 30 and 31. However, irrespective of the distance of displacement (within reasonable limits), the force exerted on the anchor cable will remain substantially constant and will be well within the limits of the force necessary to displace the anchor 24 and cause the latter to walk from its planted position. Since the negator spring system acts on the cable drum for only a predetermined part" of the overall cable length, the system automatically adapts itself to varying depths of water. Furthermore, the spring system or assembly need not be unduly large or bulky.

If the buoy is, to be used as a permanent marking buoy, the constant-force spring mechanism still contributes the important advantage of preventing drift, and this means that the anchor need not be unduly heavy or large, thereby reducing labor and transportation costs involved in planting heavier buoys.

Obviously, the buoyant device to be anchored need not necessarily be a ,buoy;.it could beany type of water craft or floating object utilizing a cable and cable drum or wrench for connecting the device to its anchor.

while the invention has been shown applied to only one type of buoy, it will be obvious that it could be applied to other types without the exercise of the inventive faculties once the basic concept has become known to those having a laymans knowledge of the art. For example, certain types of buoys utilize a relatively stationary or non-rotatable type of cable drum or analogous cable-storage member and the cable is wound on and unwound from the drum by means of a rotating arm secured on the cable drum shaft and carrying guide pulleys over which the cable is trained. In such an arrangement, the output reel for the negator spring (corresponding to reel 33) would act on the shaft for the rotating arm, which shaft usually projects through the center of the non-rotating cable drum. Thus the constant force spring and reel assembly may be readily adapted to any type of buoy having a rotatable member which controls the winding and unwinding of the anchor cable.

What we claim is:

1. A combination marking buoy and anchor therefor comprising a housing defining a buoyant chamber, means for releasably connecting an anchor to the housing, an anchor cable for connecting the buoy to its anchor, means for storing said cable in coiled condition in said housing exterior of said chamber, means for uncoiling and guiding said cable when the anchor is released and drops to anchoring position including a member which rotates in relation to the effective length of the cable required to anchor the buoy, a spring take-up reel having a metallic prestressed constant force ribbon spring wound thereon, a spring output reel adapted to rotate with said rotatable member and to have said spring wound thereon and unwound therefrom in response to variations in flotation forces acting on the buoy when the anchor is in anchored position, and means for connecting said rotatable member to said output reel for rotation in unison therewith after the cable has been payed out to within a predermined distance of anchoring depth.

2. In a combination, a buoyant device and an anchor therefor, an anchor cable for connecting said device to its anchor, a rotatable cable drum, a spring take-up reel having a prestressed constant-force ribbon spring wound thereon, a spring output reel adapted to rotate with said cable drum and to have said spring wound thereon and unwound therefrom in response to variations in flotation forces acting on the buoyant device when said anchor is in anchoring position and said device is riding on the surface of the water, and means for automatically disconnecting said drum from said output reel when said buoyant device is submerged beyond a given depth and to reconnect the drum to the output reel when said device is freed from its anchor and rises to approximately said given depth.

3. A combination buoy and anchor package comprising: a buoyant housing, an anchor releasably connected to said housing, a rotatable cable drum and a shaft therefor mounted in said housing, an anchor cable wound on said drum and connected at its free end to said anchor, a constant-force spring assembly comprising an output reel loosely mounted on said shaft and a take-up reel having a pre-stressed constant-force ribbon spring wound thereon and adapted to be wound on and unwound from said output reel in response to variations in flotation forces acting on the buoy, and means for automatically connecting said drum to said output reel after said package has been planted in a body of water and the housing has been freed from its anchor and has risen to a predetermined depth.

4. A combination buoy and anchor package comprising: a buoyant housing, a contoured anchor adapted to engage the bottom of said housing, pressure-responsive means for releasably connecting said anchor to said housing, a rotatable cable drum and a shaft therefor mounted in said housing, an anchor cable wound on said drum and connected at its free end to said anchor, a constantforce spring assembly comprising an output reel mounted for free rotation on said shaft and a take-up reel having a pre-stressed constant-force ribbon spring wound thereon and adapted to be wound on and unwound from said output reel in response to variations in flotation forces acting on the buoy, and pressure-responsive locking means carried by said drum and adapted to connect the drum to the output reel for rotation therewith or free the drum from the output reel, depending upon the depth at which said housing may be riding.

5. A combination marking buoy and anchor therefor comprising a housing defining a buoyant chamber, means for releasably connecting an anchor to the housing, an anchor cable for connecting the buoy to its anchor, means for storing said cable in coiled condition in said housing exterior of said chamber, means for uncoiling and guiding said cable when the anchor is released and drops to anchoring position including a member which rotates in relation to the effective length of the cable required to anchor the buoy, a spring take-up reel having a metallic prestressed constant-force ribbon spring wound thereon, a spring output reel adapted to rotate with said rotatable member and to have said spring wound thereon and unwound therefrom in response to variations in flotation forces acting on the buoy when the anchor is in anchored position, and pressure-responsive means for connecting said rotatable member to said output reel for rotation in unison therewith after the cable has been payed out to within a predetermined distance of anchoring depth.

6. A combination buoy and anchor therefor comprising: a buoyant housing, an anchor, pressure-responsive means releasably connecting said anchor to said housing, a cable drum rotatably mounted in said housing, an anchor cable wound on said drum and connected at its free end to said anchor, a constant-force spring assembly comprising an output reel adapted to be connected to and rotate with said drum and a take-up reel having a prestressed constant-force ribbon spring wound thereon and adapted to be wound on and unwound from said output reel in response to variations in flotation forces acting on the buoy and tending to rotate the drum.

7. A combination buoy and anchor package comprising: a buoyant housing, an anchor releasably connected to said housing, a rotatable cable drum and a shaft there for mounted in said housing, an anchor cable wound on said drum and connected at its free end to said anchor, a constant-force spring assembly comprising an output reel loosely mounted on said shaft and a take-up reel having a prestressed constant-force ribbon spring wound thereon and adapted to be wound on and unwound from said output reel in response to variations in flotation forces acting on the buoy, and latch means controlled by a device responsive to changes in water pressure for automatically connecting said drum to said output reel after said package has been planted in a body of water and the housing has been freed from its anchor and has risen to a predetermined depth.

References Cited in the file of this patent UNITED STATES PATENTS 2,198,755 Berndt Apr. 30, 1940 2,586,828 Keeran Feb. 26, 1952 2,673,694 Howell Mar. 30, 1954 2,830,309 Lawson Apr. 15, 1958