US3744759A

US3744759A - Control for cable reel

Info

Publication number: US3744759A
Application number: US00194298A
Authority: US
Inventors: A Jennings
Original assignee: Eastern Rotorcraft Corp
Current assignee: Eastern Rotorcraft Corp
Priority date: 1971-11-01
Filing date: 1971-11-01
Publication date: 1973-07-10
Anticipated expiration: 1990-07-10

Abstract

A cable stored on a reel drum can be reeled out to any adjusted length within its limit to engage a load. The reel is supplied with control mechanism to allow locking the drum for load transfer between the cable and the reel at any adjusted position. The locking and unlocking is accomplished either by remote electrical control or by mechanical (manual) control at the reel. A manually operated safety lock located on the reel housing prevents inadvertent release of the locking mechanism during load carrying operations. Engagement of the safety lock automatically disconnects the electrical control while the safety lock is being used. The electrical actuator clutch is controlled to give proper phase engagement for correct synchronization with the mechanical control operation as well as to protect against undesired backdrive into the actuator.

Description

United States Patent 1 1 Jennings 1 July 10, 1973 CONTROL FOR CABLE REEL Primar ExaminerHarve C. Hornsb 7 I h F. ll y y y 5] nventor ur Jennings, W1 ow vGrove Anomey flams S- Campbell [73] Assignee: Eastern Rotorcraft Corporation,

Doylestown, Pa. ABSTRACT 22 i N 1, 1971 A cable stored on a reel drum can be reeled out to any adjusted length within its limit to engage a load. The [21] App! 194,298 reel is supplied with control mechanism to allow locking the drum for load transfer between the cable and 52 us. (:1. 254/150 R, 254 173, 254/187, thc rccl at y adjusted p t h locking and 242 107 133 9 locking is accomplished either by remote electrical [51] Int. Cl B66d 1/30 control or y mechanical control at t e [58] Field of Search 254/1757, 173, 150, A manually cpcratcd Safcly lock lccatcd cn thc rccl 254/186, 187; 188/69; 242/107 housing prevents inadvertent release of the locking mechanism during load carrying operations. Engage- [56] R f r Cit d ment of the safety lock automatically disconnects the UNITED STATES PATENTS electrical control while the safety lock is being used. 3 4 The electrical actuator clutch is controlled to give z fi fi 25 R proper phase engagement for correct synchronization l3 H1962 Kinniso'; 254/186 R with the mechanical control operation as well as to pro- 312201701 11/1965 Clausen 3:31:15 254/l87 tect against undesired backdrive 3,ll6,892 l/l964 Pickard 254/187 2,708,555 /1955 Heinemann 188/69 14 Clams Drawmg Flgul'es 270 I i 96 3s A5 38 8 95a 0 95 38 64 I53 670 7 a 13 :58, A 88 e1 3 3:} K1 6|d 5592 3g 8 V s2 I 92 9 u 93 i 7 94 PAIENIED Jul 1 0 m5 A TTORNEY PArimznm 1 W5 3.744.759

SHEET 3 BF 4 I INVENTOR. Bybziwz.

ATTORNEY PAIENIEU JUL 10 ms sum 1; or 4 I BY / lNVE'NTOR.

CONTROL FOR CABLE REEL BACKGROUND OF THE INVENTION The present invention relates to storage reels for load carrying cables and is particularly concerned with reels suitable for mounting on helicopter type aircraft for suspending loads by means of a plurality of cables spaced at different locations on the aircraft to provide a multiple point suspension system. Prior reel systems of this general nature have been equipped with mechanical control systems for locking the cables in adjusted load carrying position. The locking action has been operated from a central control location, such as the aircraft operators position. Each reel incorporates a rewind spring to retract the cable to stored position when the reel is unlocked. The length of extended cable is controlled by the crewman to the desired adjustment to connect to a load. With the reel unlocked, the cable may be extended against the rewind spring tension to the adjusted position where it is engaged with the load by means of the terminal hook or other suitable attachment device. When all cables are properly adjusted to their load connecting points, the reels are locked to provide for load transfer from the cables to the reels to allow pick up of the load.

SUMMARY OF THE INVENTION Each of the cable reels of the improved system has incorporated in it electrical control operated from a central location with individual mechanical control operable at each reel. The manual safety lock is applied at each reel and when engaged causes interruption of the electrical system for the corresponding reel during the time of application of the safety lock.

In addition to the electrical actuation of the locking and unlocking of the reel, indicator lights with suitable circuits and control switches are provided to show when each reel is unlocked and also to show when the safety lock is engaged.

It is an object of the invention to provide a reel control incorporating an electrical actuator to lock and unlock the reel at any desired degree of extension of the support cable. Electrical circuits are provided so that the electrical operation for each reel may be controlled from the operators station which may be located, for example, in the cockpit of the aircraft.

Another object of the invention is to provide a me chanical control for the reel locking and unlocking which is compatible with the electrical control system. To accomplish the required compatibility, the mechanical control is manually operated at each reel and incorporates a throwout to disconnect the locking mechanism from the electrical actuator. Thus when the control is moved from locked to unlocked, the electrical actuator remains disconnected from the operating mechanism. To reconnect the electrical control, it is necessary to operate the electrical actuator to move it from locked to unlocked position at which point the electrical actuator is again in proper related position with the reel mechanism and automatic reengagement occurs to bring the electrical actuator back into the system. A similar condition exists for manual operation to move the control from unlocked to locked condition. Thus the operator has a choice in returning the mechanism manually to the position it was disengaged from the electrical actuator or operating the electrical system to reposition the actuator to reengage. In either case reengagement of the electrical actuator is automatic when proper synchronization is achieved.

Another object is to provide a specially configured engaging clutch for the electrical actuator to protect the relatively fragile actuator drive parts from damage when reverse forces are developed during release operation. The clutch engaging parts are arranged with lost motion clearance equal to the angular movement required for engagement or disengagement. In this way the actuator has moved clear of the clutch back drive surface before the actuator is engaged to release the mechanism. Thus at any point in the releasing of the shaft back forces may move the shaft to full release position without engaging the electrical actuator portion of the clutch. As a result, the actuator is protected against overload damage.

A further object is to provide a manually engageable safety lock which can be engaged when the mechanism is in locked (load carrying) position. Moving the safety lock to engaged position also operates an electrical switch to interrupt the electrical circuit to the actuator to prevent energization of the electrical actuator to move from the locked position.

A still further object is concerned with the provision of suitable switches and circuits to give a visual indication at the operators station when the mechanism is in unlocked position and also when the safety lock is engaged.

BRIEF DESCRIPTION OF THE DRAWINGS How the foregoing and other objects and advantages are accomplished will be evident from the description of the drawings wherein FIG. 1 is a side view of a helicopter aircraft showing one manner in which reels of the present type may be used.

FIG. 2 is an elevational view of one of the reels.

FIG. 3 is a front elevational view of the reel shown in FIG. 2 with the cover member removed.

FIG. 4 is a view to an enlarged scale of the upper portion of the reel taken along the lines 4-4, FIG. 5, the housing parts having been omitted for clarity.

FIG. 5 is a sectional view through the upper portion of the reel taken along the lines 5--5, FIG. 4.

FIG. 6 is a detail view of the safety lock control switch mechanism taken generally in the direction of arrows 6-6, FIG. 4.

FIG. 7 is a sectional view through the actuator clutch parts showing them in position to engage the brake parts at the completion of the brake engaged cycle.

FIG. 8 is a view similar to FIG. 7 but showing the clutch parts at an intermediate position during the brake release cycle.

FIG. 9 is a view similar to FIG. 7 but showing the clutch parts at the full brake release position at the completion of the actuator release cycle.

FIG. 10 is an electrical wiring diagram of the internal and external portions of the reel electrical system.

DETAILED DESCRIPTION Referring to the figures, FIG. 1 shows a helicopter of the lifting crane type having a plurality of rotor blades 11 and a fuselage 12 which includes an operator's compartment 13. Also attached to the fuselage is the main landing gear 14 to which wheels 15 are connected. A similar landing gear structure extends on the opposite side of the fuselage. The forward landing gear is located 18 are shown attached to the sides of the fuselage 12 and a cable 19 extends from each of the reels 18. A terminal hook 20 is attached to the end of each cable 19 and these are shown connecting into lifting brackets 22 attached to a vehicle 21.

In FIG. 3 the reel is shown attached by mounting bolts 23 to attachment structure 24 and a strut 25 which extends inboard from the reel to the fuselage structure to provide for spacing the reel from the fuselage at the desired distance. With this system a fourpoint suspension is provided for carrying loads under the fuselage of the helicopter. FIGS. 2 and 3 also show a special terminal fitting 26 for connecting the hook 20 to the cable 19. This is provided for the purpose of indicating when the cable load reaches the maximum allowable. The terminal 26 is connected electrically with the reel system. As will be seen in FIG. 4, an insulated pair of electrical conductor-s 27 extends throughout the length of the cable 19 and projects beyond the cable anchor terminal 28. (See FIGS. 4 and Conductor wires 27 are connected with wires 27a which extend into the reel electrical system in a fashion which will be described later.

Referring to FIGS. 2 5 inclusive, reel 18 incorporates a housing having central portion 29, inboard plate 30 and outboard plate 31. A lightweight cover member 2911 protects the interior from entry of dust and moisture. Cover 29a is omitted from FIG. 3 for clarity. Extension support 32 is attached to the housing parts by bolts 33. The

housing plates

30 and 31 are assembled to the central portion 29 by bolts 34. The extendable cable 19 is stored on drum 35 which is constructed with a peripheral groove 36 extending around the drum with a suitable lead to assure proper positioning of the cable when reeled into stored position. As will be best seen in FIG. 4, the last quarter turn of the groove 36 is distorted as shown at 36a to allow the end portion of the cable 19 to be embedded deeper into the drum to position the anchor terminal 28 to lie within the drum ra dius. A bolt 37 extends through the anchor terminal 28 to attach it to the drum 35.

The drum 35 is supported rotationally on the housing by bearings 38 which are mounted on the inboard and

outboard plates

30 and 31. Also supported mainly on the outboard plate 31 is the drum locking mechanism and the manual control therefor. For this purpose a toothed ring 39 is attached to the drum 35 by bolts 40. A pair of

toothed shoes

41, 41 are oppositely positioned to be engaged with or disengaged from ring 39. The

shoes

41, 41 are each anchored by pivot bolts 42 and anchor fittings 43 which in turn are attached to outboard plate 31 by

bolts

44 and 45. To move anchor shoes 41, 41 into and out of engagement with the teeth 39a of ring 39, a pair of

radial plates

46, 46 are pivotally connected to the shoes 41 by the

bolts

47, 47. The

radial plates

46, 46 are each mounted on eccentric members 48, 48a,

bearings

49, 49 being used to assure free rotation between the eccentric members 48, 48a and

radial plates

46, 46. The eccentric members 48, 48a are both fastened by suitable means, for example the

keys

50, 50 to the shaft 51 which is supported in the outboard plate 31 in a bearing 52, the axis of which is concentric with the axis of rotation of the drum 35. The shaft 51 is constructed with a flange member 53 used to limit the rotational movement of the shaft 51. Also the shaft 51 has an internal spline 54 which mates with the external spline 55 on the central control shaft 56.

The shaft 56, besides being supported for rotational and sliding movement at spline 55, is also supported in cover plate 57 which is mounted on outboard plate 31 by suitable screws 58 (FIG. 2). A sleeve 59 around control shaft 56 retains the shaft in the longitudinal position shown in FIG. 5 under the urging of compression spring 60. The shaft 56 projects outside outboard plate 31 and a handle 61 is connected to the shaft 56 by means of pin 62. The handle 61 is movable through an are as indicated in FIG. 2 to move the eccentric members 48, 48a sufficiently to disengage the teeth of the

toothed shoes

41, 41 from the teeth of the toothed ring 39. The flange member 53 is provided with limit stops 63, 63a (FIG. 4) which engage stop pin 64. A safety lock pin 65 is mounted in the structure of outboard plate 31 and may be moved into hole 66 in flange 53 when the handle 61 is in engaged position as shown by the position of the parts in FIGS. 2, 4 and 5.

In FIG. 6 the lock pin 65 is shown moved into locked position where it is held by rotation of pin 65 (note screwdriver slot 65a for this purpose) so that the small guide pin 67 is moved into position out of registry with its guide slot 68. A spring 69 urges lock pin 65 out of locked position when guide pin 67 is in registry with slot 68. In FIG. 2 it will be noted that plate 70, which normally hangs down as indicated, can be swung about pivot 71 until it covers lock pin 65 when it is in locked position. A detent 72 retains plate until it is desired to unlock the mechanism by releasing lock pin 65. Thus plate 70 can act as an indicator to show when the mechanism is locked.

The handle 61 is retained in either extreme position (locked or unlocked) by spring 73 reacting between plunger 74 and cylinder 75. Plunger 74 engages the handle 61 with a ball end 76 and cylinder is supported on plate 57 by a loosely fitting pivot pin 77 This attachment for the handle retention provides for the swinging movement of the handle 61 as well as for the slight longitudinal movement required for disconnecting the manual control from the electrical as will be explained below.

At the opposite end of the control shaft 56 from the handle 61, an electrical actuator 78 is mounted on inboard housing plate 30 by screws 79 which fasten the actuator to internal axis structure 80 connected to plate 30 by bolts 81. Actuator 78 includes a suitable motor with reduction gearing and electrical controls. Drive shaft 82 extends from the actuator 78 and clutch part 83 is attached to the shaft 82 to provide for engagement with the control shaft 56. An external clutch part 84 formed integral with the control shaft 56 provides an operating connection between the actuator driveshaft 82 and the control shaft 56.

FIGS. 7, 8 and 9 show the shape and relationship of the

clutch parts

83 and 84 for various operating positions. The actuator clutch part 83 is formed with an external projection 85 extending through an arc of 130 as shown in FIG. 7. In somewhat similar fashion an internal projection 86 is formed on clutch part 84 and it also extends through an arc of 130 (FIG. 7). In FIG. 7 the

clutch parts

83 and 84 are shown in drum locked relationship. To move the mechanism to the unlocked" position the electrical actuator 78 is energized to move shaft 82 in counterclockwise direction which moves clutch part 83 through lost motion till it reaches the position in FIG. 8 where projection 85 engages the face of projection 86 and continues to move a further 100 carrying clutch part 84 with it to the unlocked position shown in FIG. 9. This relationship of projections provides clearance between the non-driving face of projection 85 so that in the event the release mechanism becomes self-energized during the releasing motion the projection 86 will not impact against projection 85 and cause damage to the actuator shaft or mechanism. The locking operation is the reverse of the unlocking. Thus from the position of the clutch parts in FIG. 9, the clutch part 83 and projection 85 responds to reverse energization of actuator 78 to move 100 clockwise till it contacts projection 86 where it then carries it through 100 to the locked position of FIG. 7.

In FIG. 5 it will be seen that the

projections

85 and 86 of

clutch parts

83 and 84 are in registry with each other. The control shaft 56 may be moved longitudinally a slight amount by pushing in on handle 61 until boss 61a contacts cover plate 57. Thus the spring 60 is compressed and the projection 86 is moved so that it is out of registry with projection 85. The control shaft is thus disconnected from the electrical actuator and the mechanism can be moved manually to unlocked or locked position as desired. Thus the control shaft 56 and the

clutch part

84, 86 can be moved from the locked position shown in FIG. 7 to the unlocked position in FIG. 9, while the actuator shaft and its

clutch parts

83, 85 remain in the position of FIG. 7. The projection 86 is then behind the projection 85 and the manual handle remains in its pushed in" position until either the handle 61 is moved to locked position or the electrical actuator is moved to unlocked position when the projections are in compatible positions and the clutch parts engage again under the influence of spring 60.

With the mechanism in unlocked position, the cable 19 may be pulled out from its retracted position by causing rotation of the drum 35 in the clockwise direction as viewed in FIG. 4. To rewind the cable on the drum a clock type spring (FIG. 5) is provided to react against the housing and the drum to turn it in a counterclockwise direction. The rewind spring is divided into two separate parts 87, 87a, supported in insulated relationship to each other, to the drum 35 and to housing plate 30. Thus the inner end of each rewind spring 87,

87a is anchored to a

hub part

88, 880 by suitable bolts 89, 89a which in turn are in engagement with metallic fittings 90, 90a and electrical connections 91, 910. Three separator plates 92 protect the spring parts 87, 87a and plates 92 are supported by outer

annular members

93, 93a which are attached to the drum 35 by bolts 94. The outer ends of spring parts 87, 87a are anchored to

annular members

93, 93a by bolts 95, 95a which also serve to attach

electrical connections

96, 96a forming electrical conductor 27a.

Parts of the electrical system have been described in the foregoing. The complete electrical diagram is shown in FIG. 10 and this will be described with reference to other figures where constructional details are involved. Connector box 97 (FIG. 5) collects all the conductors from the reel unit and connects them into the multiple terminal connector 98. Mating connector 99 carries the conductors illustrated by cable 100 (FIG. 5). Actually all the conductors shown in FIG 10 above

connector

98, 99 are associated with the external con-' trols and the part of the system in the aircraft. The circuits shown below the

connector

98, 99 relate to equipment and circuits carried by the reel. Terminal connector 101 connects the actuator 78 circuits into the terminal 98 by cable 102 in FIG. 5. The actuator 78 is shown diagrammatically in FIG. 10 and with the toggle control switch 103 in the full line position shown has moved the actuator shaft 82 and clutch part 83 to the locked position shown in FIG. 7. Upon reaching the locked position internal stops in the actuator mechanism moves limit switch 104 to open the forward circuit C and close the reverse circuit D D, so the actuator can be reversed when the toggle switch 103 is moved to dotted line position. Another safety lock switch 105 is inserted in the reverse or unlocking circuit to prevent actuator operation when the safety lock 65 is engaged as shown in FIG. 6 where lock pin 65 engages hole 66 in plate 53 to prevent unlocking of the drum. An arm 105a controls the operation of switch 105 which is of the double throw double contact type. In FIG 10 switch 105 is shown with the pin 65 in unlocked position so that the mechanism can be unlocked by moving toggle switch 103 to dotted position. Switch 105, as will be seen in FIG. 10, has a second pair of contacts which close circuits H I, when the safety lock pin 65 is in engaged position. Thus in safety locked position indicator light LH lights and unlocking circuit D D is open.

Another indicator light LG is shown in FIG. 10 and this is controlled by position switch 106 which is actuated by movement of plate 46 of the locking mechanism as will also be observed in FIG. 4. As the mechanism moves the shoes 41 out of locked engagement with ring 39, the first part of the movement of radial plate 46 releases switch 106 to permit it to close into the full line position shown in FIG. 10. This completes the G E circuit to light LG indicating unlocked status of the reel.

The third indicator light LF shown in FIG. 10 is to indicate the maximum permissible load in cable 19. Terminal 26 (FIG. 2) incorporates a switch 107which is arranged to close when the terminal 26 is subjected to a predetermined load thus lighting indicator light LF. Conductors 91, 91a are shown in FIG. 5 connecting to the inner ends of the dual springs 87, 87a and connecting at the outer ends with dual wire conductors 27a, 27. Conductor 27 extends through the cable 19 to terminal 26 as described previously.

In FIG. 10 there are shown diagrammatically dual explosive

type cable cutters

108, 108a. These are also in FIGS. 2 and 3 and are actuated by an independent electrical system (not shown).

OPERATION When not in use the reel holds the cable in retracted position and the mechanism will normally be in locked position with the switch 106 open to cause indicator light LG to be unlit. If desired the safety lock may also be engaged causing switch 105 to be in position opposite that shown in FIG. 10 wherein the indicator light LH will be on" and the unlocking circuit will be open. To use the reel a ground crewman will first remove the safety lock pin 65 to move switch 105 to the position shown in FIG. 10 to close the unlocking circuits D D The mechanism can then be unlocked by the operator moving toggle switch 103 to the dotted line position. The actuator 78 then goes through its cycle to move the control

clutch parts

84, 86 from the position shown in FIG. 7 to the position in FIG. 9. In this position the shoes 41 are out of engagement with the ring 39 and the reel drum 35 is free to rotate against the restraint of springs 87, 87a, when the crewman grasps hook 20 and pulls out the cable 19 t the position desired to engage the load to be attached. When the various cables have been adjusted and attached to the load, the reels may then be locked by the operator. This is done by moving toggle switch 103 to full line position causing the

clutch parts

84, 86 to be moved from the FIG. 9 position to the FIG. 7 position. In so moving the mechanism is moved to engage shoes 41 with ring 39 to lock the drum 35 in position to transfer the cable load into the reel ready to be lifted. Normally the crewman will engage safety pin 65 before the load is lifted.

In case of failure of the electrical system, the crewman can at any time disconnect the

clutch parts

85, 86 and lock or unlock the mechanism manually. This is done by pushing in on handle 61 against the pressure spring 60 and then rotating the handle 61 to the locked or unlocked position. This puts the clutch parts out of registry and clutch part 86 lies behind clutch part 85 (See FIGS. 5, 7, 8 and 9). To return to normal relationship to handle 61 may be moved to the proper position of the actuator clutch 85 or the actuator maybe operated to bring the clutch part 85 into phase with the clutch part 86. Under either condition when the

clutch parts

85 and 86 are in proper relative position the clutch will automatically reengage under the influence of spring 60. This actuator clutch arrangement provides a relatively simple and reliable system which permits changing from manual operation to power operation as desired or needed. The lost motion or clearance between the clutch part 85 and clutch part 86 prevents damage to the actuator when self-energizing loads from the teeth cause movement of the mechanism faster than the actuator requires. The actuator is thus protected from reverse drive loads.

A ground crewman by quick visual inspection can tell the condition of the reel. The position of the handle indicates that the reel is either locked or unlocked. The position of the cover plate 70 will indicate whether the safety pin 65 is engaged or released.

I claim:

1. A cable storage reel having a. a stationary housing assembly,

b. a cable receiving drum mounted for rotation with respect to said housing,

c. means for anchoring a cable terminal to said drum to provide transfer of a cable load to said drum,

(1. mechanism for locking and unlocking said drum with respect to said housing to provide for transfer of load between said drum and said housing when the mechanism is locked and for movement of said reel for adjustment and rewind when the mecha- 5. a manual control member connected to one end of said shaft and 6. an electrical actuator connectible with the other end of said shaft.

2. A reel construction in accordance with claim 1 in which said actuator has a drive shaft in alignment with said control shaft, clutch parts for transferring rotational movement from said actuator drive shaft to said control shaft, said clutch parts having arcuate projections shaped to allow said actuator shaft to move approximately one-half its total angular travel before engaging said control shaft to move it.

3. A reel construction in accordance with claim 1 wherein said actuator has a drive shaft in alignment with said control shaft, clutch parts for rotationally connecting said actuator drive shaft and said control shaft, said clutch parts being disengageable by relative axial movement of said control shaft and said actuator drive shaft, said clutch parts being shaped to permit engagement only when the control shaft and drive shaft are in compatible rotational position wherein each shaft is in the same phase of operation.

4. A reel construction in accordance with claim 1 in which said control shaft extends through said housing and is supported for limited axial movement, a handle being provided at the outer end of said control shaft for manually shifting said control shaft axially to disengage it from said electrical actuator and to permit manual rotation of said control shaft to locking and unlocking positions.

5. A reel construction in accordance with claim 4 in which an electrical indicating system is provided including a limit switch actuated by movement of one of said control interconnections to indicate the unlocked position of said drum.

6. A cable storage reel having a. a stationary housing assembly,

b. a cable receiving drum mounted for rotation with respect to said housing,

0. means for anchoring a cable terminal to said drum to provide transfer of a cable load to said drum,

d. mechanism for locking and unlocking said drum with respect to said housing to provide for transfer of load between said drum and said housing when the mechanism is locked and for movement of said reel for adjustment and rewind when the mechanism is unlocked, said mechanism including 1. a ring member attached to said drum,

2. a shoe element movably supported on said hous- 3. a radially disposed arm connected at its outer end to said shoe device,

4. an eccentric device supported on the rotational axis of said drum and connected to the inner portion of said arm, rotational movement of the eccentric device in one direction causing outward extension of said arm to provide engagement of said shoe with said ring member, opposite rotational movement of said eccentric device causing retraction of said arm to cause disengagement of said shoe from said ring member,

5. a locking control shaft mounted on the axis of said drum and engaged with said eccentric device for simultaneous rotation therewith, one end of said shaft extending through said housing,

6. a manual control handle connected to the outer end of said control shaft, and

7. an electrical actuator engageable with said control shaft.

7. A reel construction as in claim 6 in which there are a plurality of shoe elements, radially disposed arms and eccentric devices arranged in balanced relationship with respect to said ring member to provide simultaneous movement of the shoe elements relative to the ring member.

8. A reel construction as in claim 6 in which there is a pair of shoe elements, a pair of radially disposed arms and a pair of eccentric devices arranged in opposite relationship to give balanced engagement of the shoe elements with said ring member.

9. A reel construction as in claim 6 in which a rotatable disc is connected to said eccentric device for rotation therewith and a stop member is supported on said housing for engagement with said disc to limit the rotational range of said eccentric device.

10. A reel construction as in claim 9 in which a safety locking element is supported on said housing for movement with respect thereto, said locking element being movable to engage said disc when the disc is in its locked limit position, thereby providing against accidental release of the drum.

11. A reel construction as in claim 6 in which said ring member and said shoe element have engageable teeth, the shoe element being movable into and out of teeth engageable position, said teeth being symmetrical and pointed in shape.

12. A reel construction as in claim 6 in which said control shaft is shiftable axially to disengage the electrical actuator to allow independent manual operation and a spring member is provided to urge said shaft to actuator engaged position.

13. A reel construction as in claim 12 in which said control shaft incorporates a terminal clutch part and said actuator incorporates a mating clutch part, said parts being shaped to allow engagement only when the shaft and actuator are in the same phase of operation.

14. A reel construction as in claim 9 in which a safety locking element is supported on said housing for movement with respect thereto, said locking element being movable to engage said disc when the disc is in its locked limit position, thereby providing against accidental release of the drum, a limit switch is positioned to be actuated by said locking element when it is moved to engage said disc, said switch being constructed to provide for operating a locked signal and at the same time to provide for interruption of the electrical actuator unlocking circuit.

Claims

1. A cable storage reel having a. a stationary housing assembly, b. a cable receiving drum mounted for rotation with respect to said housing, c. means for anchoring a cable terminal to said drum to provide transfer of a cable load to said drum, d. mechanism for locking and unlocking said drum with respect to said housing to provide for transfer of load between said drum and said housing when the mechanism is locked and for movement of said reel for adjustment and rewind when the mechanism is unlocked, said mechanism including, 1. a ring member attached to said drum, 2. a locking element supported on said housing for limited movement with respect thereto, 3. a locking control shaft supported on the rotational axis of said drum by said housing to provide limited rotational movement with respect thereto, 4. control interconnections between said shaft and said element to cause movement of said element into and out of engagement with said ring member for locking and unlocking said drum, 5. a manual control member connected to one end of said shaft and 6. an electrical actuator connectible with the other end of said shaft.

2. a locking element supported on said housing for limited movement with respect thereto,

2. a shoe element movably supported on said housing,

3. a locking control shaft supported on the rotational axis of said drum by said housing to provide limited rotational movement with respect thereto,

3. a radially disposed arm connected at its outer end to said shoe device,

4. control interconnections between said shaft and said element to cause movement of said element into and out of engagement with said ring member for locking and unlocking said drum,

5. a manual control member connected to one end of said shaft and

6. an electrical actuator connectible with the other end of said shaft.

6. A cable storage reel having a. a stationary housing assembly, b. a cable receiving drum mounted for rotation with respect to said housing, c. means for anchoring a cable terminal to said drum to provide transfer of A cable load to said drum, d. mechanism for locking and unlocking said drum with respect to said housing to provide for transfer of load between said drum and said housing when the mechanism is locked and for movement of said reel for adjustment and rewind when the mechanism is unlocked, said mechanism including

7. an electrical actuator engageable with said control shaft.

14. A reel construction as in claim 9 in which a safety locking element is supported on said housing for movement with respect thereto, said locking element being movable to engage said disc when the disc is in its locked limit position, thereby providing against accidental release of the drum, a limit switch is positioned to be actuated by said locking element when it is moved to engage said disc, said switch being constructed to provide for operating a ''''locked'''' signal and at the same time to provide for interruption of the electrical actuator unlocking circuit.