US2358096A - Airplane bomb hoist - Google Patents

Description

p 1944- G. A. PETERSON Q 2,358,096

' AIRPLANE BOMB HOIST Filed Aug. 18, 1941 2 Sheets- Sheet 1 --FIG.VI" H Smaentor GERALD'A. PETERSON attorney p G. 'A. PETERSON AIRPLANE BOMB HOIST Filgd Aug. 18 1941 2 Sheets-Sheet 2 m QE N. om

V Snbentor GERALD A. PETERSQN .AIILI a: m My capacities.

It is a further object to advance the'sirnplicity and compactness of the hoist by a novel arrange- Patented Sept. 12, 1944 2,358,096 AIRPLANE noMB'noIsT Gerald A. Peterson, Seattle, Wash., assignor-to Boeing :AircrafhGompany, 'Seat corporation of Washington tle, Wasln, a

Application August 18, 1941, Serial No. 407,290

9 Claims. (01. 254-172) This invention relates to hoists, suchas are which may vary from perhaps one hundred pounds up to as much as several thousand pounds.

it goes without saying that the handling of such loads is a delicate operation, one fraught with same danger, and the more so in that the lighter compact, rugged, and light in weight;

7 appear asthis specification progresses, my'invention comprisesthe novel parts andthe novel comof the general nature indicated, which is simple,

With; these and other objects in mind, as'will bination and'arrang'ement thereof, as shown in the accompanying drawings, described in this specification, and as will be more particularly defined by the claims whichterminate the same.

In the accompanying drawings I have shown the invention incorporated in a typical hoist; and

. have shown how the same maybe installed and carrying the bombs will tend to rise and fall or to rock and pitch, with wave action, in a manner or with a periodicity difierent fromthat of the flying boat itself. As aresult a bomb which has been or which is about to. be picked up by the hoist on the airplane may rise with the barge, and relative to the airplane, faster than it is being hauled up, creating slack in the linefand then when the barge drops away this slack'is' taken up, and if the arrangement is such that a sudden Jerk is produced, this may tear the bomb loose from its hoist line, to the obvious danger of all persons in the vicinity and to the flying boat.

, Primarily it is an object of the present invention to provide a hoist for such service as has been indicated, which has associated with it or incorporated within it automatic means which, upon slackening of the cable load, will take up the slack, but which upon increase of the cable load to nor-- mal, or even to a greater value, will permit a certain amount of yielding to'avoid shock, but will smoothly snub and quickly stop. any downward movement of the bomb load, and hold th bomb showing parts in different operative positions.

used, it being remembered that the drawings are illustrative only. V

Figure 1 is a perspective view of an airplane and lighter, in the act of loading a bomb' aboard the airplane. Fi ure 2 is an axial section through the hoist on the line 2+2 of Figure 3, but with certain parts shown in elevation. v V V Figure 3 is'a transverse section through the hoist, on the line 33 of Figure 2, showing parts in an intermediate position, as in picking up the load; V

Figures 4 and 5 are views 'similar to Figure 3,

, Figure 6 is a vertical'sectional view taken along line li- -fiof Figure 2 showing a conventional representative drive gearing arrangement,

Referring to Figure l, the hoist, illustrated in general atH, is suitably mounted, aswithin the suspended, and then quickly and immediately continue its upward movement, all without shock or jerk. In this manner the bomb will rise clear of the barge, before the latter can rise again.

More particularly it is an object of the invention 'to provide ahoist of this nature which operates by a combination of spring and hydraulic means, to the ends already outlined.

But a hoist which is arranged to handle 100 pound loads may not function properly with a 3600 pound load, and vice versa. Accordingly, it is a further object to'providea hoist which is readily adjustable or adaptable to the handling of such widely varying loads, thus avoiding the necessity of providing separate hoists of difierent wing W, conveniently to a doorway or hatch D, through which the bombs B are to be loaded. A

vlighter-,or barge Lis arranged to support the lighter starts to rise before a b'ombhas been lifted clear there will be at tendency for the cabl 0 to slacken, and for it to come taut with a jerk when the lighter drops away again.

The hoist 'H is supported upon any suitable base, here shown as, consisting of spaced standards and 9|, connected by a casing 9 which Rotatably'supported houses an electric motor. 4 I from this base is an inner' sleeve 1, which" is driven from the motor 9 through gearing con tained within the gearcase 92, and which it is not necessary toillustrate in-detail. The sleeve quickly adapted to the intended load.

I, then, may be considered the driving element of the hoist, for it is connected to the driving mtor 9.

The drum 2, for compactness and convenience, is arranged concentrically about and spaced outwardly from the inner sleeve I, and is arranged for rotation with and with relation to the sleeve.

Side walls .20 and 2| may be formed integrally with either .the sleeve or the drum, though as shown they are connected to thedrum. They fit tightly about the sleeve, and'there is thus formed between the sleeve and the drum an annular space, which is filled with a suitabl fiuid as light oil.

This annular space is divided by an abutment ,other, or as shown, in both the abutment 25 and the vane I5. 'A passageway and a corresponding snubbing check valve is illustrated at 28, in the abutment 25, arranged to block flow from the chamber 3 to the chamber 4, but to permit slow and restricted flow from the chamber 4 to the chamber 3. Similar but oppositely directed check valves l2, conveniently positioned in the vane I5, are arranged to block flow from the. chamber 4 to the chamber 3, but to permit substantially unimpeded flow, at least relatively to the flow in the opposite sense past the snubbing valve 28, from the chamber 3 to the chamber 4. The snubbing valve 28is' of well-known type which opens to permit free flow in one sense, ,but closes auto matically to restrict flow and damp movement in the opposite sense.

An adjustable regulating valve 29, accessible from the exterior of the drum 2, restricts more or less the .flow through the port in abutment 25 past the-snubbing valve 28 when such valve is open. The relatively free flow permissible when handling a 100 poundload would be inadequate to snub a 3600 pound load; conversely, the now adjustment suited to the 3600 pound load would too quickly and sharply snub the lighter load.

By adjustment of the valve 29 the hoist can be To transmit driving torque from the sleeve l to the drum'2 I provide a yieldable or spring means,

such'as the. coil spring 5, anchored at 5| to the sleeve I, and at 52 to thedrum 2. This spring will normally be'pretensioned, and when the hoist is'at rest, and there is no tension on the cable C, the spring will draw the abutment 25 into close proximity to the then stationary vane I5. .Stop lugs 25 on the walls 20 and 2I limit this movement, of the abutment. This position of rest is not illustrated in the drawings. I Figure 3 shows an intermediate position, which may be. assumed to be the position of partswhen picking up the load.,Counterclockwise rotation of the sleeve I by the motor 9 has commenced, and the vane l5, departing from the stops 26 on the drum 2 (now held stationary by the applied load), has rotated counterclockwise, as seen in Figure 3. The cable C, wound about the drum 2,

is increasingly tensioned, and thespring' 5 is more tightly wound or tensioned by the rotation assaooe rotation is snubbed somewhat by the fluid, which is restricted in its passage past thefsnubbing valve 28 from the chamber 4 into the chamber 3. This avoids shock from too abrupt application of lift,

. plate 25, projecting radially inward from the and causes the load to bepicked up smoothly. Eventually the spring 5 is tensioned in an amount equivalent to the applied static loadof the'b omb,- whereupon (assuming no external instantaneous r plays no part in supporting the actual static load;

it has theretofore functioned (through valves 28 and 29) to prevent too abrupt application of lift to the load, and will continue to function in this manner andalso'to snub the load if it is abruptly decreased, as will shortly appear.

If the applied load (static or instantaneous) becomes extremely large the vane I5 may reach the opposite side of the abutment 25, as seen in 30 of parts shown in Figure 3 or from that shown in Figure 4. In such a case, as shown in Figure 5, slackening of the tension upon the, cable C will permit the accumulated force of the spring 5 to effect overrunning of the drum with relation to the sleeve, and in this case the abutment 25,

flow from the chamber} into the chamber 4. However, as soon as the tendency to slacken the moving counterclockwise, as seen in Figure 5, quickly increases the size of the chamber 4 and decreases the size of the chamber 3. The check valves I2 open freely to' permit substantially free load on the cable is overcome, by dropping away of the lighter from beneath the'bomb which it supported, there is a tendency for relative clockwise movementof the drum with relation to the sleeve, though thesleeve 2 still continues to rotate in an absolute counterclockwise sense, and the actual sense of rotation of the drum may likewise be counterclockwise. However, this tendency to reverse rotation of the drum with relation tothe sleeve immediately closes the check valves I2, and tends to open the valve 28. It also tends to increase the tension in the spring 5. The restriction afforded by'the snubbing valve '28, in accordance with the adjustment of the regulating valve 29, tends to snub the load and to pick it up smoothly, and eventually'to transfer the static load and torque wholly to the spring, until parts resume their normal hoisting positions, and hoistingproceeds as before.

What I claim as my invention is:

1. A hoist comprising a'driveninner sleeve, a spaced, concentric, and relatively rotatable outer drum, and side walls cooperating therewith to define an annular fluid-filled space, spring means secured to each of the sleeve and the drum to transmit torque from either to the other, and active'to effect or permit relative rotary. movementof the sleeve and drum upon change of load conditions, an abutment upon the drum and a vane upon the inner sleeve, within and dividing the annular space into two chambers of complementally variable size valved ports in the abutment and vane, respectively, affording relatively free communication between the chambers for spring-urged winding-in of the drum, reacting from the inner sleeve,'upon a decrease of the cable load on the drum from normal, and afiording relatively restricted communication between the chambers to damphydraulically adynamic increase in cable loads. t p 1 2. A hoist comprising 'an'inner sleeve, a spaced, concentric, and relatively rotatable outer drum,

and side walls cooperating therewith to define an such spaces to damprelative rotation of said sleeve and drum.

6. A hoist comprising a central :drive' motor; an'intermediate sleeve, and an outer hoist drum, n

all disposed concentrically and in coplanar registry, means connecting one, end of said sleeve to said drive motor for driving the sleeve therefrom, a coll torsion spring connecting the other controlled flow of liquid therethrough between end of said sleeve to said drum for rotating said drum by'rrotationof said sleeve, said sleeve and said drum defining an annular'chamber therea between, liquid filling such chamber, partition w annular fluid-filled space, drive'm'eans operatively {connected to the sleeve, spring meansintercon- 'Lnecting the sleeve and drum for driving, and operable to effect winding-in of the drum upon lessening of the cable load upon the drum,'and to winding-in of the drum upon decrease of the cable load, and an aperture formed in the abutment, and a damping valve therein affording restricted relative rotation in the opposite sense.

3. A hoist comprising a driving member and a drum, spring means reacting between the two to wind in the drum from the driving member, hydraulic means also operatively connecting the driving member and the drum, said hydraulic means including, a casing defining an annular fluid-filled space, an abutment and a vane dividing the space into two chambers of mutually variable size, of the abutment and vane one being connected to move in accordance with movement of the driving member and the other in accordance with movement of the drum, valved ports in the vane and abutment affording passages for fluid from onechamber to the other, arranged and automatically operable to restrict such flow and to snub relative movement when the vane and abutment move relatively in a sense to increase the spring force, but to permit substantially unimpeded flow when, under the influence of the accumulated spring force and a lessened cable load, the vane and abutment tend to move relatively in the opposite sense, and means accessible from the exterior of the drum to adjust the flow in the snubbing sense, and thereby to vary the snubbing eifect in accordance with the intended load. 4. A hoist as in claim 2, including a regulating valve cooperating with the abutment aperture to vary the effective size thereof, said regulating valve being accessible fromv the exterior of the drum.

5. A hoist comprising a central drive-motor, an

' intermediate sleev,.a nd an outer hoist drum all disposed concentrically and in coplanar'registry, means connecting one end of said sleeve to said drive motor for driving the sleeve therefrom, a coil torsion spring connecting the other end of said sleeve to said drum for rotating said drum by rotation of said sleeve, said sleeve and said drum defining an annular chamber therebetween, liquid filling such chamber, partition means dividing such chamber into mutually variable arcuate spaces, including a plate projecting inward from a means dividing such chamber inmmutuany var-g iable arcuate spaces, including a plate projecting inward from said drum to said sleeve through such liquid filledfchamber and a plate projecting outward from said sleeve to said'drum through the liquid filled chamber, and damping means" including damping ports extending through said partition means for controlled flow of liquid therethrough between such spaces, and valve I means closable by relative rotation of said sleeve and drum stressing said coil spring to increase the restriction of such damping ports, for damping substantially such relative rotation of the sleeve'and drum, and openable by relativerotation of said sleeve and drum relaxing said spring to decrease the restriction of such damping ports. 7

7. A hoist comprising a sleeve, amotor operable to rotate said sleeve, a hoist drum concentrically encircling said sleeve, a torsion spring interconnecting said sleeve and said drum and sufiiciently stiff to transmit the entire load hoisting torque of said'motor from said sleeve tofsaid drum while strained'less than 360, said sleeve and said drum defining an annular chamber therebetween, liquid filling such chamber, parti tion means dividing such chamber into two mutually variable arcuate spaces,including a single plate only projecting inward from said drum to said sleeve through such liquid filled chamber, and a single plate only projecting outward from said sleeve to said drum through such liquid filled chamber, and damping means including damping ports extending through said partition means for controlled flow of liquid therethrough between such spaces, to damp relative rotation of the sleeve and drum.

8. A hoist comprising a sleeve, a motor operable to rotate said sleeve, a hoist drum concentrically encircling said sleeve, a torsion spring interconnectingsaid sleeve and said .drum and sufiiciently stifi to transmit the entire load hoisting torque of said motor from said sleeve to said drum while strained less than 360, said sleeve 7 and said drum defining an annular chamber therebetween, liquid filling such chamber, partition means dividing such chamber into'two mutually variable arcuate spaces, including a single plate only projecting inward from said drum to said sleeve through such liquid filled chamber, and a single plate only projecting outward from said sleeve to said drum through such liquid filled chamber, and damping means including damping ports extending through said partition means for controlled-flow of liquid therethro'ugh between such spaces, and valve means movable towardclosed position by relative rotation of said sleev and drum stressing said spring to increase the restriction of such damping ports, for. damping substantially such relative rotation of the sleeve and drum, and movable toward open position by relative rotation of said sleeve and drum relaxing said spring to decrease the restriction of such damping ports.

9. A hoist comprising a central drive motor, an intermediate sleeve, and an outer hoist drum 1 all'disposed concentricallyand in coplanar registry, means connecting onejend 015 said sleeve to said drive motor for driving the sleeve there from, a, coil torsion spring connecting the other end of said sleeve to saiddrum' and sufliciently stifl to transmit the entire load hoisting torque of said motor from said sleeve to said drum .while strained less than 360, said sleeve and said drum defining an annular chamber therebetween, liquidfilling such chamber, partition means dividing such chamber into two mutually variable 7 arcuate' spaces, including a single plate only pro- Jecting inward from said drum to said sleeve relative rotation of said sleeve ing said spring to decrease the restriction of such through such liquid filled chamber, and a single plate only rojecting outward from said sleeve to said drum through such liquid filled chamber,

and t damping t e ns including damping ports extending thro dpartition means for conthrough between such ovable, toward closed e-rotation'oi said sleeve and aidcoil' spring to increasethe restrictionbf such damping ports, for damping substantially such relative rotation of the sleeve and drum, and movable toward open position by and drum relaxdamping ports.

7 GERALD A, PETERSON.

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