US2658723A - Full automatic hoist - Google Patents

Description

Nov. 10, 1953 F. w. com-ms FULL AUTOMATIC HoisT 2 Sheets-Sheet 1 Filed Aug. 4, 1951 N Md MW Mm m V m I v fl K D E R F. w. COFFING FULL AUTOMATIC HOIST Filed Aug. 4, 1951 2 Sheets-Sheet 2 Patented Nov. 10, 1953 FULL AUTOMATIC HOIST Fredrick W. Coffing, Danville, Ill., assignor to Coiling Hoist Company, Danville, 111., a corporation Application August 4, 1951, Serial N 0. 240,405

15 Claims. (Cl. 254-167) The present invention relates to improvements in hoists or like devices, which may be used not only as hoists but may be used as wire stretchers or used in connection with load binding devices.

One of the objects of the invention is to provide a simple rugged compact hoist capable of step by step raising or lowering of the load, and which whendesired may be so manipulated as to permit free running of the hoist chain used in connection therewith.

. Another object of the invention is to provide a hoist structure of the above characteristics in which the manipulation of the parts for selectively raising or lowering the load for free chaining maybe effected by simple manipulation by the operating handle and without any other manual control than that provided by the manipulation of the operating handle.

The present invention is a continuation in part for so much as is disclosed therein of my copending application for improvement in Full Automatic Hoist and Binder filed March 9, 1950, Serial No. 148,727, now abandoned.

For the purpose of disclosing the invention I have illustrated in the accompanying drawings certain embodiments thereof.

In said drawings Fig. l is a side elevation of one form of a hoist embodying my invention.

Fig. 2 is an end elevation, partially in section, of the illustration in Fig. 1.

Fig. 3 is a side elevation similar to Fig. l, with the handle at the end of its load lowering stroke, and

Fig. 4 is a similar elevation to Fig. 1 with the parts in free chain position.

Fig. 5 is a side elevation of a modification of the structures illustrated in Figs 1 to 4.

Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

Fig. 7 is a side elevation similar to Fig. 5 with the handle in the position that is reached at the lower limit of its lifting stroke.

Fig. 8 is a side elevation similar to Fig. 5 showing the handle in position at the beginning of the lowering stroke. and

Fig. 9 is a side elevation similar to Fig. 5 with are spacers M. This structure provides a means not only for holding the side plates Ill-l0 in position to form a housing for the structure, but also maintains the same in their spaced apart relation.

At the lower end of the plates I provide a shaft or pin [5, which extends through the plates and carries the roller member l6 over which the link chain I! is adapted to pass. It is to be noted that this roller is provided with annular central groove l8 on either side of which are provided annular flanges 19. The central groove l8 provides an accommodation for the vertically disposed links of the chain [1, while the horizontally disposed links of the chain ride over or on the flanges l9. In the structure illustrated the chain itself provides the ratchet teeth with which the operating pawl and the holding pawl are adapted to cooperate. The holding pawl 20 is mounted on a pivot pin 2| extending through the plates and is provided with a pawl end restricted in cross section as at 22 so that it will engage in the horizontal links of the chain IT. This pawl is biased in its engaging position through the medium of a coiled spring 23, one end of which is attached to the base of the pawl as at 24 and the other end of which is secured as at 25 to one of the plates I0. This holding pawl is provided with a pin 26 extending through a slot 21 in a side plate, the purpose of which will appear more fully hereinafter.

Oscillatingly mounted on the shaft or pin IS on the outside of the plates [0 are a pair of links or arms 28, one end of which arms are pivotally mounted on the shaft. The pin or shaft I5 is locked in position through the medium of snap rings 29. The outer ends of these links 28 have Oscillatingly mounted to the same on a transversely extending pin 29 an operating pawl 30, the end of which is reduced sufiiciently to engage in the horizontal links of the chain. This operating pawl 30 is extended to provide a handle 3| which may be a continuation of the pawl or may be a separate piece secured to the extension of the pawl.

Rotatingly or oscillatingly mounted on the pin I5 is what may be termed a cam structure 32 which is provided with an extension cam arm 33 having a notch 34 in one face thereof adapted to, under predetermined conditions, engage with the pin 26 on the holding pawl 20. This cam member in its periphery is provided with a pair of shoulders 35 and 3B which, under predetermined conditions, are adapted to be engaged by a pin 31 on one of the links 28.

In normal hoisting operation of the structure 3 above described, the links 28 are swung upwardly on their pivotal connection with the shaft l5 by raising the handle 3|. When they have reached the normal limit of their upward stroke, by pulling down on the handle 3| the pawl 30 is moved into engagement with one of the horizontal links ofthe chain I1, which effect provides a ratchet tooth; and by pulling down on the handle with the pawl engaged, the wheel I6 is rotated in a clockwise direction, moving the chain l! in a hoisting direction. During, this movement the holding pawl 20 ratchets over the links or teeth of the chain;

limits of the normal operation, the parts may When; the; handleand operating pawls have reached the lower then be again raised to take another bite ii J and during this raising operation, of coursathe holding pawl is efiective for preventing the weight of the load on the chain I1 to cause a reverse-"movement 'ofthewheel and chain.

If it be desired to lower the load, the-links 28 and holding pawl are swung into the position illustrated in Fig. 3. Int-his position it is' to be noted that the operating pawl 30 is in engaging position and that the pin 3! has; engaged the shoulder 36- of the floating cam moving the arm 33 intoa position to move, and hold, the holding pawl out of engaging position. Under these circumstances with the operating pawl still in engaging position, the handle and links can be raised under the control of the operator, allowing the weight of the load to move the load chain in the opposite direction and rotate the wheel 16 in a counterclockwise direction. Asthe parts move upward, the pin 31- eventually strikes the shoulder 35 kicking the notch 34 out of engaging and holding position with respect to, the pin 26 on the holding pawl, and allowing the holding pawl to drop into holding position so that the handle and operating pawl, may be released to be lowered for another bite or into .theposition illustrated in Fig. 3, at which time, of course, the P n 31 i n a th sh ul 3 mo in the cam. holding arm 33, into a position tomove he holding paw ut of t n g n sit on- 'It will be understood, or course, that when t e p ts a h the, pos t n. llustrated n. F a, sli h ownward pullonlthe holding pawl will rotate the ratchet wheel I6, sufliciently in aloc wise i ectionv o relieve the holdi pa O strain. thereon. s hat. it. an. eadily be m ed toits non-hold n p i n- If it be desired to.- place. the. hoist in, a free chainingposition,after theholding pawl; hasbeen moved to its disengaged position by. the movement, of the handle and links to the position illustrated inliig. 3, the links and handle may. be

swung upwardly, but not far enough to. cause the pin 31 to engage the shoulder 35 to, disengage the holding pawl; and at the same time the handles-l may be, swung on its pivot to disengage th op r t n pawl. With. the two pawl n his position and both in disengaged positionqfree chaining is effected.

InFigs. 5 to 9 I have illustrated a. modification of the structure shown in Figs. 1 to 4 inclusive, which structure is more particularly adapted for use with a roller or sprocket type chain. I have provided a pair of side plates 38 -38 similar to the side plates Ill. At the top of the housing formed by these side plates 33-48 a hook is mounted in an eye 39, which in turn is fastened the swivel halves 40 extending from the frame plates and secured by means of a bolt 4 4i headed as at 42 at one end and receiving a nut 42' at the other end.

Rotatably mounted in the plates 38-38 at the opposite end from the swivel halves is a shaft 43 on which is rotatably mounted a ratchet wheel 44 having ratchet'teeth 45 so faced as to operate betweenthe links of the roller chain 46. Above the shaft 43 and'the ratchetwheel 44 is mounted a holding pawl pin 47, which extends through the plates, being headed as at 48 at .one;.-endand receiving a cotter pin or similar device 48 at the other. Mounted upon the pin is. holding pawl 49, which is equally spaced between the plates- 38, spacer sleeves such as 41' surrounding the'pin and being interposed betweentheisides of the pawl and the plates. The pawl 49 is biased into engaging position with the teeth 45 through the medium ofa coiled spring 50, one end of which is looped over a pin 5| on the free end of the pawl; anditheother .end': of which is anchored as .at'-52.: to one of the side: platesl Thispin 5 I, on whichthe end ofthe coiledY-spring bears, projects through a slotv 531 in the side plates for a purpose which will Imoreful'ly hereinafter appear.

Mention should 'be'made' of the fact that the ratchet wheel 44 is maintained in its spacedposi tion between the p1ates.38:through the-means of suitable sleeves 54 surrounding the pin 4,1! and disposed one on each side of thera'tchet' wheel so that the same is maintained inits centered position. 7

Oscillatingly supported on thepin or's'haft 43 is a pair of links 55, which are rotatably .oroscillatingly mounted on said pin 43 at oneend, and at the other end has pivotally mounted thereon through the mediumof the pin 55 the operating pawl 51. Thispawl, it will be noted, is provided with an extension 58 which will receive the-hol low end of a handle 59, the handlebeing main-.- tained in relation through a suitablepin: 60 extending through thehandle andthrough the extension 58. Thelinks and associated parts mounted onthe pin 43 aremaintained in posi tion and against displacement throughthe-medium of snap rings 6!. r

A floating cammember 52 similar tothe-fioating cam member 32 in-the-structureillustrated in Figs. 1' to 4-is mounted on the pin or shaft 43, and this floating oanrmember is provided-with an extension arm 63- having a cam notch 64 therein adapted underpredetermined circumstancesto notch in its periphery to provide'a pair of shoulders 65- and 66, functionally the same as the shoulders 3'5 and 35 in the structure illustrated inFigs.1to4.

Mounted-on the'pin 56isa= cam lever 61 which is adapted to be operativelyassociated with one or the other shoulders t5; and 66 under predetermined conditions. 'This cam-leverisibiased in one direction through the medium on a coiled spring 68 against a stop pin 61 0mm of the links 61', said" spring surrounding the pin- 56' andhaving one end bearing upon again 69 on-oheendofthe cam lever 67 and the opposite end looped over and bearing upon-theoperating pawl: 51j 'asat 10.

It is to be noted-thatthefholding pawl 49' and the operating; pawl 51 are each doublanotched asat -11 to provide a projecting nose-andafollowing;shoulder-*so-thatthe sprockettooth-may be contacted either by the shoulder as 'shown in-F-ig,

5 or by the nose as shown in Fig. 9, which will permit half link operation of the roller chain in lifting the load.

In operation, referring first to Fig. 5, the load pawl is shown biased in engaging position to take the load and hold the same when the operating teeth of thesprocket wheel, thereby lifting the load. The oscillating movement of the handle up and down may be continued until the load is raised to the desired point.

If it is desired to lower a load,it will be noted that in Fig. 7 the handle is in substantially the same position as in Fig. 5, although it is slightly lowered. If the handle is slightly raised and more .or less fully rotated ina counterclockwise direction about the pivotal pin 56, the operating pawl will be caused to clear the sprocket tooth with which it is engaged, and swung downwardly clearing the teeth. When the operating pawl has reached its lowermost position, that is the position illustrated in Fig. 8, the cam lever 61 engaging against the shoulder 65 will rotate the floating cam member 62 in a clockwise direction causing the notched portion 64 of the extension 63 to engage the pin 5|, and with a slight downward movement of the operating pawl to relieve the torsion on the holding pawl, the arm 63 and notch 64 engaging the pins 5| will move and hold the holding pawl out of tooth engagement. Therefore, with the operating pawl in engagement with one of the ratchet teeth, the ratchet wheel 44 may controlledly rotate under load in ,a counter-clockwise direction as the handle and operating pawl are moved upwardly. At this point the cam lever 61 will engage the shoulder 66 rotating the floating cam 62 in a counterclockwise direction to disengage the arm 63 from the pin 5|, thus permitting the holding pawl to drop back into sprocket wheel holding position. This operation may be continued by oscillating the holding pawl as long as it is desired, to allow the load to lower.

If it is desired to effect a free chaining operation of the hoist, the holding pawl 49 is moved out ,of tooth engaging position through the action of the arm 63, as above described. Upon then ,raising the handle 59, the cam lever 61 is engaged with the shoulder 66 as shown in Fig. 9 to throw the operating pawl out of engagement with the teeth 45 of the sprocket wheel 44. The sprocket wheel may then be freely rotated in either direction.

In the side plates 38 there are provided stop pins 13, which act as a chain shedder to prevent the free end of the roller chain from hitting the load carrying side of the roller chain when the handle is shown in the position illustrated in Fig. 8.

The invention claimed is:

l. A structure of the character described comprising, in combination, a housing, a rotatable wheel rotatably supported by said housing, a holding pawl pivotally supported upon said housing and normally biased toward holding position relative to said wheel, a pair of supporting links pivotally mounted on said housing and coaxially with said rotatable wheel, an operat- ;ing pawl operatively, associated with said wheel pivotally supported by said links, an operating lever rigid with said operating pawl, a cam memher for moving and holding said holding pawl in inoperative position, and means carried by said links for controlling the movement of said cam member into and out of operative position.

2. A structure of the character described comprising, in combination, a housing, a rotatable wheel rotatably supported in said housing, a holding pawl pivotally supported on said housing and having its free end biased in holding relation to said wheel, a pair of links pivotally supported coaxially with said wheel and on said housing, an operating pawl pivotally mounted at the free end of said links, an operating lever rigid with said operating pawl, a floating cam member oscillatable about the axis of said wheel having means movable into engagement with a portion of said holding pawl for moving and holding said pawl in inoperative position,

and means carried by said links for operatively moving said floating cam into and out of operative position.

3. A structure of the character described comprising, in combination, a housing, a rotatable wheel rotatably supported by said housing, a holding pawl pivotally supported on said housing and normally biased toward holding position relatively to said Wheel, a pair of supporting links pivotally supported on said housi coaxially with said wheel, an operating pawl pivotally supported at the free end of said links and in operative position to said wheel, an operating lever rigid with said pawl, a floating cam oscillatable about the axis of said wheel having spaced apart abutments at its periphery and an operating arm movable into and out of holding relation to said holding pawl, and means carried by said links movable into operative relation to said abutments for moving said floating cam into and out of holding position relatively to said holding pawl.

4. A structure of the character described comprising, in combination, a housing, a rotatable wheel rotatably supported by said housing, a holding pawl pivotally supported upon said housing and normally biased toward holding position relatively to said wheel, a pair of supporting links pivotally mounted upon said housing coaxially with said wheel, an operating pawl operatively associated with said wheel and pivotally supported on the free ends of said links, an operating lever rigid with said operating pawl, a stop member carried on the free end of said holding pawl, a floating cam oscillatable about the axis of said wheel and including a cam arm having a holding portion, and means carried by said links for moving said cam arm into and out of holding relation with respect to said stop member.

5. A structure of the character described comprising a housing, a sprocket wheel rotatably mounted upon said housing and adapted to receive a roller chain, a holding pawl pivoted on said housing and having its free end biased into holding engagement with the teeth of said sprocket wheel and having a stop member on the side face thereof, a pair of links pivotally supported on said housing coaxially with said wheel, an operating pawl pivotally mounted on the free ends of said links and operatively movable into engagement with the teeth of said sprocket wheel, each of said pawls having a nose ,for tooth engagementand a shoulder for tooth engagement selectively engageable with the teeth of said sprocket. wheel; an' operating lever rigid with saidoperating pawl, means? engagingsaid stop member for moving and holding said holding pawl out of engaging position, and means carried by said links for engaging said moving means to move the same into and out of locking position.

6. A structure of the 'characterdescribed comprising, in combination, a housing, a rotatable wheel rotatably supported in said housing, a

holding pawl pivotally supported on said: housing and normally biased toward holding position relative to said wheel, a pair of supporting links pivotally supported on said housing otally mounted on said links coaxial with the 'pivotof said operating pawl and engagable with said abutments for-controlling the movement of said floating cam, and means tor biasing said can! lever intone direction. r

7. Astructur-e of the character described comprising, in combination, a housing, a rotatable sprocket wheel rotatably supported upon said housing and adapted to receive a roller chain, 'a holding pawl pivotally mountedon said housing and biased into an engaging position relatively to the sprocketteeth of said wheel, a pair of links pivotally supported on said housing coaxially with said wheel, an operating pawl pivotally mounted on the free'ends of said links, an operating lever rig-id with said operating pawl, a floating cam oscillatable coaxially with the axis of said sprocket wheel and having means for engaging and moving said holding pawl into inoperative positicn,--said cam having spaced apart shoulders on its periphery, a cam lever pivotally mounted on the free ends of said links coaxially with the pivotalmounting of said operating pawl, a stop carried by said links ior limiting the movement of said cam lever in one direction, and means for biasing said cam lever against'said-stop, the end, of said cam, lever being movable by the movement of said links into selective engagement with the opposed shoulders of said floating cam.

8. A-structure of the character described comprising, in combination, a pair of spaced apart housing plates, a rotatable sprocket wheel rotatably mounted between said plates and adapted to receive a roller chain, a holding pawl pivotally mounted between said plates and having its free end biased into holding engagement with the teeth of the sprocket of said wheel, at "least one of said plates having an arcuate sl-ot therein, a stop pin mounted on the free end of said holding pawl and extending through said arcuate slot, a pair of links pivotally mounted coaxially with said wheel, an operating pawl pivotally mounted between the free ends of said links and adapted for engagement with the teeth of said sprocket wheel, an operatinglever rigid with said operating pawl, a floating cam member osc'illatably mounted coaxially with said wheel and having a cam arm adapted for moving into daily with said opera-ting pawl and on the free 8 s endsIof-said links, one .end' of said cam lever being adapted tor engagement with theopposing shoulr ders on said floating cam, a stop on at leastone of said links for limiting the movement of'said cam lever in one direction, and means. for bias.- i-ng said cam lever against saidstop.

v9. In a structure for effecting the moyement in a housing of a flexible, relatively inextensible means, the combination of a wheel rotatable in the housing, a pair'of pawls voperativelyassociated with the wheel for controlling the rotation of said wheel, one of said pawls being pivotally supported by the housing in offset relation to the wheel and having an engagingfree end directed toward the wheel, links pivotally connect ing the other pawl to the wheel, a handle pivotally supported by the other end of said links, the said other pawl comprising a rigid extension of said handle, and floating cam means opera- .tively associated with both pawls for step by step advance or retrograde movement of the flexible means, said pawls being disposable in the disassociated position relative to said flexible means when no load is imposed thereon for free reverse movement of the flexible means.

10. A structure for eflecting the movement of a flexible normally inextensible means, said structure having a housing, in combination a wheel means rotatably supported by said housing having a periphery over which-said flexible means passes, a load holding pawl pivoted upon said housing and normally biased into holding engagement with said flexible means on the periphery of said wheel, an oscillatable flexible means moving pawl engageable with said flexi-ble means on the periphery of said wheel and movable in one direction to rotate said wheel, a handle rigid therein for oscillating the same, link means pivotally supporting at one end said moving pawl and pivotally supported at its opposite end on said housing coaxially with the wheel axis, a cam member oscillatably supported on said housing and movable from an inoperative position to an operative position to move and hold said holding pawl out of holding engagement with said flexible means, and means on said link means eng-ageable with said cam member for oscillating the same into and out of moving and holding position.

11. In a structure for efiecting the movement of a flexible normally inextensible means having a housing, the combination of wheel means rotatably supported by said housing, a load holding pawl pivoted upon the housing and normally constrained toward the wheel in a load holding position, a flexible means moving pawl, a handle rigid therewith for oscillating the same, link means pivotally supported at one end of said handle and the last mentioned pawl and at the other end being pivotally supported by the said housing coaxially with the wheel, an oscillating cam and latch member carried by the said housing and movable into camming and latching position to move and hold said holdin pawl out of load holding position, and means operably associated with said link means and movable there- :by for oscillating said cam andlatch member into and out of latching position relatively to said holding pawl.

12. In a structure foroperating a flexible normally inextensible load support and having a housing including an axle and a load wheel rotatablysupported upon said axle forearrying said s pp rt, in combination therewith, a load ho ing pawl pivoted upon said housing-normally biased into load holding position for holding said wheel and load support, a supporting link pivotally mounted on said housing concentrically of said axle, an operating lever fulcrumed on one end of said supporting link having a rigid load pawl at one end and a handle extension on the other end thereof, said load pawl being movable into and out of load operating position upon rocking said lever about its fulcrum, a latch pivotally mounted on said housing, a latch engaging member on said holding pawl, and a lost motion actuating element on said supporting link operatively associated with said latch to move it into pawl latching engagement with said member upon said lever and supporting link being moved to one predetermined position, and out of said latching engagement to free said holding pawl upon said lever and supporting link being moved to another predetermined position, said lever and load pawl being effective to manipulate the load through the lost motion movement intermediate said predetermined positions.

13. In a structure for operating a flexible normally inextensible load support and having a housing including an axle and a load wheel rotatably supported upon said axle for carrying said support, in combination therewith, a load holding pawl pivoted upon said housing normally biased into load holding engagement with said load support, a supporting link pivotally mounted on said housing concentrically with said axle, an operating lever fulcrumed on one end of said supporting link having a rigid load pawl at one end and a handle extension on the other end theerof, said load pawl being movable into and 3 out of load operating engagement with said load suport upon rocking said lever about its fulcrum, a latch pivotally mounted on said housing, a latch engaging member on said holding pawl, and a lost motion actuating element on said supporting link operatively associated with said latch to move it into pawl latching engagement with said member upon said lever and supporting link being moved to one predetermined position, and out of said latching engagement to free said holding 4 pawl upon said lever and supporting link being moved to another predetermined position, said lever being rockable upon said link into and out of load support engagement during the lost motion movement intermediate said predetermined 0 operating lever fulcrumed on one end of said sup porting link having a rigid load pawl at one end and a handle extension on the other end thereof, said load pawl being movable into and out of load operating position upon rocking said lever about its fulcrum, a latch pivotally mounted on said housing concentrically with said axle with an arcuate portion thereof cut away to provide spaced stop shoulders thereon, a latch engaging member on said holding pawl, and a lost motion actuating projection on said supporting link freely movable thereby through the cutaway portion of said latch during the load manipulating action of said holding pawl, and adapted to engage one of said shoulders when moved in one direction to effect engagement by said latch on said engaging member to render the holding pawl ineffective upon said supporting link being moved to one predetermined position, and engage the other of said shoulders to disengage said latch from said engaging member and render said holding pawl effective on said supporting link being angularly displaced to another predetermined position.

15. In a structure for operating a flexible normally inextensible load support and having a housing including an axle and a load wheel r0- tatably supported upon said axle for carrying said support, in combination therewith, a load holding pawl pivoted upon said housing normally biased into load holding position for holding said wheel and load support, a supporting link pivotally mounted on said housing concentrically of said axle, an operating lever fulcrumed on one end of said supporting link having a rigid load pawl at one end and a handle extension on the other end thereof, said load pawl being movable into and out of load operating position upon rocking said lever about its fulcrum, a latch pivotally mounted on said housing concentrically with said axle having an arm portion movable into and out of latching engagement with said holding pawl to render said holding pawl ineffective when in latched position, said latch having :an arcuate cutaway portion concentric with said axle terminating in spaced stop shoulders, and a latch actuating member on said link movable through said cutaway portion to provide a lost motion action relative thereto during the manipulation of the load by said load pawl, and engageable with said stop shoulders respectively at predetermined extreme positions of said supporting link and lever for swinging said latch to and from its pawl latching position.

FREDRICK W. COFFING.

References Cited in the file of this patent UNITED STATES PATENTS Number

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