US3358968A

US3358968A - Continuous loop variable penetration winch

Info

Publication number: US3358968A
Application number: US590018A
Authority: US
Inventors: Ralph E Walsh; Laky Elmer
Original assignee: Breeze Corp Inc
Current assignee: Breeze Corp Inc
Priority date: 1966-10-27
Filing date: 1966-10-27
Publication date: 1967-12-19
Anticipated expiration: 1984-12-19
Also published as: SE322027B

Description

Dec. 19, 1967 R. E. WALSH ET AL 3,358,968

CONTINUOUS LOOP VARIABLE PENETRATION WINCH 3 Sheets-Sheet 1 Filed Oct. 27, 1966 y f w 3 m fii e T 2 Dec. 19, 1967 R, E. WALSH ET AL 3,358,968

CONTINUOUS LOOP VARIABLE PENETRATION WINCH Filed Oct. 2'7, 1966 3 Sheets-Sheet 2 Z MJfWM ,4rroeA/s Y Dec. 19, 1967 WALSH ET AL 3,358,968

coNTINuous LOOP VARIABLE PENETRATION WINCH 3 Sheets-Sheet .3

FiledOct. 27, 1966 INVENTORS 644/ .4? W454 Y 2 75 ZAKY W I anuune 4 United States Patent 3,358,968 CONTINUOUS LOOP VARIABLE PENETRATION WINCH Ralph E. Walsh, Long Branch, and Elmer Laky, Cranford, N.J., assiguors to Breeze Corporation, Inc., Union, N.J., a corporation of New Jersey Filed Oct. 27, 1966, Ser. No. 590,018 Claims. (Ci. 254-1753) ABSTRACT OF THE DISCLOSURE A winch is disclosed in which the cable is continuous and has a free extending looped portion for raising and lowering a load. The cable is led over a capstan and then into a two-part storage reel of rotatable drums. The storage reel itself can be rotated to raise and lower the loop without interrupting the travel of the cable through the winch. In order to permit shortening of the loop the cable is crossed over between the drum members and the drums are offset to prevent wear of the cables.

This invention relates to hoists and winches and more particularly to a winch employing a continuous looped cable capable of operating at a selectively variable penetration.

Where it is desired to operate winches from hovering aircraft, such as helicopters, tethered lighter than air craft, or the like, it is necessary to maintain the winch cable at a constant distance from the surface. Variations in aircraft height due to atmospheric, or operating conditions must be compensated for in order to maintain satisfactory loading or unloading operations.

Previously known winches employing a conventional cable have been unsatisfactory for hovering aircraft use inasmuch as the single cable had to be stabilized long enough for loading or unloading purposes and the load afiiXed to the cable would often strike the ground with a resulting damage to the cargo or personnel. ltVhere rescues were attempted at sea, wave action also made conventional winches and cable unsatisfactory.

Accordingly, it is an object of the present invention to provide a winch and cable which will overcome the shortcomings of prior art devices.

Another object of the present invention is to provide a winch assembly which will compensate for sudden changes in aircraft position during loading and unloading operations.

Still another object of the present invention is to provide a winch assembly which is capable of a wide variety of operations including simultaneous loading and unloading.

A further object of the present invention is to provide a winch assembly capable of lifting loads in excess of presently known devices.

Another object of the present invention is to provide a winch capable of continuous loading without the need of reeling in and paying out of cable.

Still another object of the present invention is to increase loading and unloading speeds in winch operation.

A still further object of the present invention is to provide a winch having a continuous cable in which the stresses upon the cable are kept to a minimum.

Another object of the present invention is its use of a continuous cable together with a weight freely carried by the cable for loading and unloading operations while the aircraft is hovering.

A feature of the present invention is the use of a multidrum storage reel assembly capable of varying the operating length of the cable.

Another feature of the present invention is its novel means for the regulating of the depth of penetration of the looped cable to meet specific loading or unloading requirements.

A further feature of the present invention is its novel cable disposition upon the storage reel assembly to minimize cable stresses.

The invention consists of the construction, combination and arrangement of parts, as herein illustrated, described and claimed.

In the accompanying drawings, forming a part hereof, there are illustrated 3 forms of embodiment of the invention, in which drawings similar reference characters designate corresponding parts, and in which:

FIGURE 1 is a somewhat isometric view of a helicopter employing a winch made in accordance with the present invention for deploying personnel.

FIGURE 2 is a view, in side elevation, of a complete embodiment of the present invention.

FIGURE 3 is a view in rear elevation, somewhat enlarged, taken on line 33 in FIGURE 2, looking in the direction of the arrows.

FIGURE 4 is a somewhat diagrammatic view of the capstan and storage reel assembly of the present invention showing the path of the cable.

FIGURE 5 is a view in vertical section taken on line 5-5 in FIGURE 2, looking in the direction of the arrows.

FIGURE 6 is a somewhat diagrammatic view of another embodiment of the present invention.

FIGURE 7 is a fragmentary cross-sectional view of a storage reel assembly according to a further embodiment of the present invention.

The invention broadly contemplates a winch having a capstan for reeling in and dispensing cable from a storage reel assembly which includes a plurality of small rotating drum members which can be turned as a unit to vary the depth of penetration of the cable passing through the winch. The cable is continuous and the dispensing end of the cable is in the form of a loop to which there may be attached a weight carried by a pulley which freely rotates Within the loop. Loading and unloading operations are achieved by securing objects or personnel to the cable loop as the cable is fed through the winch during winch operation.

Referring to the drawings and particularly to FIG- URE 1, 10 indicates a hovering aircraft such as a helicopter. A winch 11, made in accordance with the present invention is secured to the aircraft 10, and a loop of cable 12, is lowered from the winch 11 in the hereinafter more fully set forth manner.

The cable 12 is maintained in its vertical position by means of a weight 13 carried by a pulley 14, best shown in FIGURE 2. The pulley 14 rides freely upon the cable 12 and maintains the bottom of the loop at a desired distance from the ground.

Referring to FIGURES 2 land 3, it will be seen that the capstan 15 of the winch is built upon a frame 16 having a front plate 17, a load bearing plate 18, and a capstan plate 19. The frame members are held in rigid spaced relationship by means of bolt-like cross supports 20, 21, 22 and 23, etc. Two horizontally spaced

drums

24 and 25, hereinafter referred to as capstan drums, are-journaled between the load bearing plate 18 and the capstan plate 19, upon

shafts

26 and 27. The

capstan drums

24 and 25 are driven by a motor 28 (see FIGURE 5), the output shaft 2? of which has gear 30 keyed thereto.

The

capstan drums

24, 25, .are provided with spaced annular grooves 32 to receive the cable 12. The annular grooves 32 of the capstan drum 24 are laterally displaced a distance of pitch from the annular grooves of the drum 25, so that the cable 12 may be wound upon the

drums

24, 25, and follow a substantially helical path around the said drums making the helical cross over in the space between the drums. As indicated in FIGURE 2, the cable 12 comingfrom the capstan drum 24 is lead downwardly and around a storage reel assembly 33. The storage reel assembly (best shown in FIGURES 2, 3, 4 and consists of a plurality of small annularly grooved drum members 34, which are carried between spaced

circular plates

35, 35a. The

plates

35, 35a are journaled upon

shafts

36, 37 carried by the load bearing plate 18, and front plate 17, respectively. The spaced

plates

35, 35a together with the drums 34 are rotatable upon the

shafts

36, 37, by means of a control arm 38 connected to a drive shaft 39 to which is pinned a drive gear 40. The gear 40 is in mesh with gear teeth 41 formed on the periphery of plate 35a. Each of the small cable receiving drums 34 has secured thereto a spur gear 42 which forms part of a gear train interconnecting the drums 34 which form one of the two drum complexes in the storage drum assembly. The drum complexes, hereinafter referred to as the first and second stage drum complexes, are driven in a manner whereby the first stage drums all rotate in the same direction and the second stage drums all rotate in a direction opposite to those of the firststage. Power. is supplied to the drums 34 through a power train driven by the motor 28. The power drive consists of the motor output gear 30 which is in mesh with

gears

31, 43. The

gears

31, 43, are pinned to the

capstan drums

24, 25. The capstan drum 24 has one plate 44 of a torque limiting clutch 55 secured thereto. A sprocket gear assembly 45, is driven through the slip clutch 55. The sprocket gear 45 transmits power through a chain 46, to a second sprocket gear 47 carried upon the shaft 36. An over-running ratchet 48 is located between the sprocket gear 47 and the shaft 36 so that rotary motion can be imparted to the storage reel main gear 58, pinned to the shaft 36, in one direction. Each of the gears 42 connected to the small drums 34 are in mesh with the main gear 58.

Rotary motion in a direction opposite the first stage drum complex is imparted to the second stage drum complex by means of the cable 12 which is led from one of the first stage drums around one of the second stage drums located 180 from the first stage drum as shown in FIG- URE 4 at 56. A main gear 52 is in mesh with each of the drum gears 53' secured to the second stage small storage drums 34, to drive them in the same direction.

The cable 12 is preferably made of stranded wire suitably fabricated in the well known manner and connected at its ends to form a continuous loop. It is to be understood, however, that chain may be substituted for the cable without departing from the spirit of the invention.

Referring to FIGURE 4, it will be seen that the cable 12 is led .around the capstan drums 24, 25, and disposed within the annular grooves 32 thereof in the well known manner. The cable 12, as it leaves the capstan drum 24, is led downwardly and around the annular grooves of the small drums 34 which make up the first stage of the storage reel 33 by a level wind assembly 72. The level wind assembly 72 is operated by a gear 73 which is in mesh with plate gear 41. The level wind positions the cable with respect to the grooves in the drums 34. Here again, the small drums 34 are laterally offset with respect to adjacent drums at distance equal to one pitch in one complete revolution so as to provide a helical path for the cable 12, as it is led around the first and second stage drum complexes.

Referring to FIGURE 1, it will be seen that the cable 12, has been lowered from the aircraft 10, a distance suitable to bring the weight 13, and consequently the loop of the cable, to within a short distance of the ground 57 (other distances have been shown by way of illustration). In order to achieve this result, the control arm 38, is rotated, thereby turning the storage reel assembly 33 by means of

gears

40, 41. Rotation of the storage reel assembly 33, in one direction will decrease the number of turns of cable on the storage reel assembly 33. Rotation of the storage reel assembly 33 in the opposite direction will increase the number of turns of cable thereon. As a result, there will be a lengthening or shortening of the loop coming from the winch. In this manner, the depth of penetration of the loop can be regulated to meet the requirements of the conditions of use.

It is important that the cable 12 coming from the winch follow a path such as shown in FIGURE 4. In order to achieve this desired path, the storage reel assembly 33 is indexed by means of notches 59, provided in an indexing wheel 61 on plate 35a, which notches are engaged by a pawl (see FIG. 3). When it is desired to reorient the loop of the cable, the pawl 60 is withdrawn from the notch 59, until the suitable amount of cable has been either paid out, or drawn into the storage reel assembly 33. When the pawl 60 is inserted into the next adjacent notch 59, the cable path will be as shown in FIGURES 2 and 3. A level wind assembly (not shown) responsive to the rotation of the crank 38 is provided on the output side of the storage reel assembly 33.

Referring to FIGURE 6 there is shown a somewhat simplified embodiment of the present invention in which the cable 12 is led over a single grooved capstan 62 and wound thereon in the well known manner. The capstan 62 may be provided with a helical groove and end flanges in accordance with well known winch practices if desired.

The cable coming from the capstan 62 is led around a storage reel assembly 63 consisting of four drums, 64, 64a, 65, 65a. The

drums

64, 64a and 65, 65a, are secured in axial disposition but capable of rotation independently of each other as shown in FIGURE 6. The first drum complex in this embodiment consists of the

drums

64, 64a, and the second stage drum complex consists of the drums 65, 65a. The cable 12 is wrapped around the

first drum complex

64, 64a, for a suitable number of turns and then crossed over between the two drum complexes and wound in an opposition direction upon the second drum complex 65, 65a, in the manner shown. The cable is led from the storage reel 63 over a pulley 66 in the continuous loop as hereinabove more fully described.

The storage reel 63 is further mounted for rotation about a horizontal axis in response to the motion of the crank 67. In this manner, the loop of the cable 12, can be regulated with respect to the depth of penetration.

In FIGURE 7 there is shown a fragmentary view of a storage reel illustrating still another embodiment of the present invention, in which the second stage drums are positively driven by the first stage drums. This embodiment corresponds to that shown in FIGURE 5, with the exception that a small spur gear 68 is secured to one of the drum members 34, of the first stage drum assembly on the inside thereof, or between the first and second drum members. A second spur gear 69 is fastened to one of the drum members 34 of the second stage drum complex and is in mesh with the first spur gear 68. Motion from the second spur gear is transferred through the drum member to which it is attached and thence to a third spur gear 70, secured to the outer face of the drum member. Each of the second stage drum complex drum members is provided with an identical spur gear 70 and a main gear (not shown) similar to gear 52 in FIGURE 5, is in mesh with each of the gears 70' so as to cause the second stage drum members to rotate in the same direction. In this manner, a positive driven motion is imparted to the second stage drum complex as the winch is operated.

It is within the purview of the present invention to use the loop of the cable 12 without the weight 13, particularly in those instances where the cable is of a weight which will keep the loop in a vertical orientation. It is also possible using the hereinabove described winch to fasten a hook to the cable in lieu of the weight 13 for hoisting or lowering purposes. Since a double strand of cable is employed, the advantages of a two-part system are achieved by this structure. Heavier loads can be handled without increasing cable diameter or winch size.

The drums 34 of the storage reel assembly 33, are driven at a speed of the order of faster than the peripheral speed of the capstan drums 24, 25, in order to prevent loss of tension upon the cable as it passes from the capstan drums 24, 25, to the storage reel assembly 33. The differential in speed is provided for by the

gear train

44, 45, 46 and 48, and the slip clutch 55, located therein.

Where the variable penetration winch described herein is to be used under conditions of constant or regular variations of depth of penetration as in rescue operations in heavy seas or loading or unloading operations from helicopters to ships, or from helicopters subject to varying and violent thermal conditions, the loop of the cable 12 may require constant adjustment to compensate for the required changing depth in penetration. It is within the purview of the present invention to provide for such adjustment by means of a small motor (not shown) connected to the shaft 39 of the control arm 38. Control of the motor may be achieved by means eof various known techniques such as servo-mechanisms coupled to the automatic stabilization equipment in the aircraft. Alternately, the motor may be controlled manually by visual reference of the operator or by the use of a reference wire secured to the loading surface.

The winch described herein can be used for discharging personnel from a hovering helicopter in the manner shown in FIGURE 1. For this purpose the loop is lowered until it touches or is just above the ground and the cable started through the pulley 14. Personnel to be discharged will then couple themselves to the cable 12 by means of a friction clamp or other attaching means and will descend on the cable until they reach the ground. As each person reaches the ground he can quickly disengage his coupling and permit successive persons to land. It will be apparent that personnel can be lifted from the ground in the same manner on the upward traveling side of the loop or by reversing the direction of the cable 12. It may be possible to raise and lower containers (not shown) at the same time with the same traveling cable for transfer of cargo from the aircraft to the ground.

Cargo and other material can be loaded or discharged from a helicopter in the same manner as personnel by the use of loaders and unloaders in the aircraft and on the ground.

From the foregoing it will be apparent that there has been provided a variable penetration winch capable of a large variety of loading and unloading tasks which lends itself to rapid adjustment to meet specific requirements and which will perform under conditions heretofore impossible for winch uses.

Having thus fully described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States, is:

1. A continuous loop variable penetration winch comprising a frame, a capstan carried by the frame, a twopart storage reel assembly carried by the frame and spaced from the capstan, each of said parts comprising at least two rotatable cable receiving drum members, a continuous looped cable carried by the capstan and the storage reel assembly, said cable traversing a path through the winch around the capstan, around the drums of the first part of the storage reel, crossing over to the second part of the storage reel, around the drums of the second part of the storage reel in a direction opposite to its travel around the first part of the storage reel and then back to the capstan by way of a loop, means to rotate the storage reel assembly whereby the loop may be lengthened or shortened to provide the desired depth of penetration, and means to drive the capstan and at least one of the parts of the storage reel assembly.

2. A winch according to claim 1 in which the capstan comprises spaced rotatable drum members, a series of annular grooves in the said drum members, the grooves in one drum member being laterally offset with respect to the grooves in the other drum member whereby a helical path is provided for the cable as it crosses from one drum to the other and means to drive the two drum members.

3. A winch according to claim 1 in which the two-part storage reel assembly comprises a first stage drum complex, a plurality of spaced rotatable drums in said first stage drum complex, a second stage drum complex, a plurality of spaced rotatable drums in said second stage drum complex, a source of rotary power and gear means coupled to the first stage drums and driven by the rotary power source to rotate the said first stage drums.

4. A winch according to claim 2 in which the second stage drums are provided with gears driven by the rotary motion of the first stage drums to impart rotary motion to said second stage drums in a direction opposite to the first stage drums.

5. A winch according to claim 3 in which each of the first and second drum complex drums is provided with a series of spaced annular cable receiving grooves and in which adjacent drums in each complex are laterally offset a distance of one pitch of said grooves in one complete revolution whereby the cable will traverse a helical path around the drums as it passes from one drum to the next adjacent drum.

6. A winch according to claim 1 in which the storage reel assembly is carried between spaced plates, a small stub shaft supporting each of said plates and in which the cable crosses over from the firt stage drum member to a drum member located from said first drum member.

7. A winch according to claim 6 in which the storage reel assembly rotating means is a crank coupled to the spaced plates.

8. A winch according to claim 2 in which the capstan driving means comprises a source of rotary power, an output gear on the power source, gears carried by each of the spaced capstan drum members in mesh with the output gear, a sprocket gear assembly driven by the output gear and drivably coupled to the first of the two-part storage reel assembly, a torque limiting clutch between the output gear and the sprocket gear assembly and an over running ratchet between the sprocket gear assembly and the first of the two part storage reel.

9. A winch according to claim 2 in which the storage reel drums are driven at a speed of the order of 10% faster than the peripheral speed of the capstan drums.

10. A winch according to claim 1 in which the loop is maintained in vertical orientation by a weighted pulley freely carried by the loop.

References Cited UNITED STATES PATENTS 1,071,882 9/1913 Cole 254-175.7 2,306,835 12/1942 Tucker 254-175.7

FOREIGN PATENTS 528,469 5/1954 Belgium. 931,315 8/1955 Germany. 1,084,798 7/1960 Germany.

RICHARD E. AEGERTER, Primary Examiner. EVON C. BLUNK, Examiner.

H. C. HORNSBY, Assistant Examiner.

Claims

1. A CONTINUOUS LOOP VARIABLE PENETRATION WINCH COMPRISING A FRAME, A CAPSTAN CARRIED BY THE FRAME, A TWOPART STORAGE REEL ASSEMBLY CARRIED BY THE FRAME AND SPACED FROM THE CAPSTAN, EACH OF SAID PARTS COMPRISING AT LEAST TWO ROTATABLE CABLE RECEIVING DRUM MEMBERS, A CONTINUOUS LOOPED CABLE CARRIED BY THE CAPSTAN AND THE STORAGE REEL ASSEMBLY, SAID CABLE TRAVERSING A PATH THROUGH THE WINCH AROUND THE CAPSTAN, AROUND THE DRUMS OF THE FIRST PART OF THE STORAGE REEL, CROSSING OVER TO THE SECOND PART OF THE STORAGE REEL, AROUND THE DRUMS OF THE SECOND PART OF THE STORAGE REEL IN A DIRECTION OPPOSITE TO ITS TRAVEL AROUND THE FIRST PART OF THE STORAGE REEL AND THEN BACK TO THE CAPSTAN BY WAY OF A LOOP, MEANS TO ROTATE THE STORAGE REEL ASSEMBLY WHEREBY THE LOOP MAY BE