US1443354A - Boom and bucket - Google Patents

Description

Jan. 30, 1923. 1,443,354

Cv E. FOOTE. 500M 3ND BUCKET I Fl LED MAR. 5 l 921 i} SHEiTS SHEET 1 m z a 3mm:

I Charles E la aie,

dllonu'l Jan. 30, 1923. 1,443,354

C. E. FOOTE Boom AND BUCKET.

F: LED MAR 5. 1 921 4 6 SHEETS-SHEET 3 Ciz-a tles E Ebgte,

Jan. 30, 1923.

C. E. FOOTE. BooM AND BUCKET.

6 SHEETS'SHEET 4 Fr LED MAR. 5. I 921 C'haitles 5,035),

611mm, I

Patented Jan. 30, 1923.

UNITED STATES {PATENT OFFICE.

CHARLES E. FOOTE, OF NUNDA, NEW YORK, ASSIGNOR TO THE FOOTE COMPANY, OF NU'NDA, NEW YORK, A. CORPORATION OF NEW YORK.

BOOM AND BUCKET.

I Application filed March 5, 1921. Serial No. 450,014.

To all whom it may concern:

Be it known that CHARLES E. Foo'rE, a citizen of the United States, residing at Nunda; in the county of Livingston and State of New York, has invented certain new and useful Improvements in Booms and Buckets, of which the following is a specification.

My invention relates to a new and useful improvement in a boom and a bucket and has for an object to provide a boom and bucket especially adapted for use with concrete mixers and pavers, although of course it might be wellused on other machines that are necessarily provided with a boom and a bucket.

Still another object of the invention is be opened or closed at any desired pointduring its outward or inward travel on the boom.

As far as I am aware the operating means generally in use for emptying a bucket, that is one used with concrete pavers, necessitates the bucket traveling outwardly to a point beyond that desired and then starting the bucket inwardly which inward movement causes the trip of certain parts to thereby open the doors and empty the bucket.

This carrying of-the bucket outwardly'beyond the desired point, stopping the same and then starting the bucket again inwardly calls for very accurate work on the part of the operator, and the entire operation is not performed as quickly as desired.

Another'object therefore of the present invention is to provide a construction whereby the bucket may be quickly run out to the desired distance and while still on its outward movement, by a pressure on a footpedal brake, the bucket may be tripped even while traveling.

Still another object of the present invention is to provide a construction whereby the bucket may be tripped during its outward movement and may be equally as well closed on its inward movement so that no time may be lost for the o eration, and the or its next loadboom, the cables operating the boom and.

its associated parts so that the cables will remain accurately centered regardless of the angular position to which the boom is swung.

Still another object is to provide an arrangement hereinafter to be fully described, whereby when the doors of the bucket are closed it will be impossible for them to become accidentally unlocked which would spill the contents.

Still another object of the present invention is to provide means whereby the bucket will be automatically closed as it reaches the spout of the mixing drum even though the operator should forget to close the doors.

Still another object of the invention is to provide a cable for moving the bucket along the boom on its inward and outward travel and to provide a separate and independent cable for opening and closing the doors of the bucket.

Still another object of the present invention is to provide a novel form of lock for the doors of the bucket which lock. is in the form of a sector, that when held in one position will keep the doors locked and will remain locked until the sector is revolved beyond a central vertical axis, after which thedoors will swing open due to the. weight of the material in the bucket.

Still another object of. thepresent invention is to so providea locking means, that regardless of the weight in the bucket it will be impossible for the doors to become unlocked until the locking means which is in the form of a sector is thrown over beyond a vertical central axis.

Still another object of the present invention is to so arrange the doors of the bucket that they will call for a minimum clearance between their bottom and the ground.

Still another object is to provide a construct-ion that will be-relatively cheap to manufacture, accurate and positive in operation, and easily handled by the/operator.

With these and many other objects in view which will be revealed as the specification proceeds, the invention consists in certain new and novel arrangements and combination of arts as will be hereinafter more fully described and pointed out in the claims.

Referring now to the drawings showing a preferred type of the boom and bucket and that much of a paver as thought necessary to. illustrate the connections and relative positions of the boom and bucket with the paver,

Figure 1 is a front elevation of a paver showing a part of the operating cables for the bucket and showing in section a part of the boom.

Fig. 2 is a side elevation of a portion of a paver, showing the boom in position and the bucket on the boom, the doors of the bucket and the tripping means of the door being in their closed and locked positions:

Fig. 3 is a side view showing a portion of the paver and operating means for the boom and bucket in elevation, and the boom, bucket and the operating means for the doors of the bucket being shown in section;

Fig. 4 is a top plan view of the boom and bucket and the operating means for tripping the doors of the bucket, also the means for swinging the boom;

Fig. 5 is an end View showing a portion of the boom in section, showing the. bucket and doors and their operating means in elevation, and the dotted lines showing the doors being swung to an open position;

Fig. 6 is a fragmentary enlarged sectional view of the boom and bucket;

Fig. 7 is a fragmentary detail view showing the tripping sector for the doors in elevation and a portion of the yoke and supporting plate for the bucket rods being shown .in section;

Figs. 8, 9 and 10 are detail views of the main sector for locking and unlocking the doors 'of the bucket ,and i Fig. 11 is a fragmentary sectional view of the lower portion of the bucket and the pivotal doors.

Referring now to the invention in a general way before specifically describing the constructi0n,the invention contemplates a horizontal swinging pivotal boom which may be swung of course to any desired angle, and which boom is provided with a track on which there is supported a bucket for the reception and distribution of the concrete.

A cable is provided which is secured to the opposite suppo'rtsof the bucket so that the movement of a winding drum in one direction will cause the bucket to travel out wardly, while a movement of the drum in i the other direction will cause the drum to side or behind the central pivotal axis of the sector so that it will be impossible, re-

gardless of the weight in the bucket, to revolve the sector past its rearward normal position.

A drum is provided for operating this second cable and a brake band is connected with this drum. Therefore when the bucket is being pulled outwardly by the main driving cable, if the second cable is held against movement, the outward movement of the bucket will cause the sector to revolve as the cables are secured to the opposite ends of the sector, thereby forcing the pivotal axis of the supporting rods of the door over beyond the central pivotal axis of the sector and allowing the weight of the material in the bucket to swing the doors open. Likewise when the bucket is being drawn in wardly aslight pressure transferred to the drum operating the independent cable will cause the sector to revolve to its normal position, due to the stationary position of the cable and to the inward movement of the bucket.

Referring nowspecifically to these parts just described and to the other details and associated parts, there is shown a portion of a concrete paver 1 provided with a mixing drum 2, the discharge spout 3 and engine 4, and other parts which will be hereinafter mentioned. Pivotally mounted to the supporting arms 5 is the boom 6 which is also supported from the top by the tie rod 7 which tie rod is connected to the upright 8. This boom therefore can be slightly raised or lowered as desired, as is the usual practice. I

On the inner or pivotal end of this boom is provided the gear rack 8 which is in mesh with the worm 9 which is mounted on the shaft 10. Also located on this shaft 10 is the gear 11 which is designed to mesh with a gear 12 mounted on a shaft 13 (Fig. 3) which shaft is also provided with a small gear 14 on its outer end over which is placed a chain 15 extending to the sprocket 16 which is mounted on the shaft 17 and which shaft and sprocket is operated by the hand wheel 18.

Suitable bearings are of course provided for these different shafts and the method of swinging this boom would be the same regardless of what form of paver the boom is connected to,- the idea being simply to provide a toothed semi-circular rack and worm gear and manual means for operating the worm.

Referring now to the boom, it will be seen that it consists of two side frames 19 and 20 which may be standard sections having the upper and lower flanges 21 so that the lower flanges will serve as tracks on which the rollers 22 of he bucket carriage 23 travel. This boom is reinforced by the cross pieces 24 which are spaced as desired and are cut out. as at 26 so that'the cables to be shortly mentioned may freely travel thereunder.

At the outer end of the boom there is provided a suitably mounted axle 27 on which there is mountedtwo sheaves 28 and 29 for the reception of the two cables to be shortly mentioned. There is also secured to the outer ends of the side frames a protecting cap which will be riveted or otherwise secured to the boom, while the inner end will be reinforced by the bracket 30. Mounted on the cross pieces 24 are shown the suitably mounted rollers 31 and extending to one side of the boom in Figs. 4 and 5 is shown a cross piece 32 on which there is freelyv mounted the small roller 33.

Referring now to the rearward portion of the boom there is shown the bracket 30 in which is mounted the sheave 35, and located beneath this sheave is another sheave 36. A slight distance from this end of the boom there is mounted on a shaft 37 a grooved winding drum 38, one end of the drum being formed for the reception of a brake band 39, which in turn is connected to a pivotally mounted yoke 40 which in turn is connected by a short chain 41 to a suitably mounted arm 42, which arm is secured to anoffset rod 43, to the outer end of which in turn is secured the rod 44 having a foot pedal 45 mounted at its lower end, to pull-the same downwardly.

A downward pressure thereon on the foot pedal 45 through the upward pull of the yoke member 40 will apply the band brake 39 to the winding drum 38 and hold the same against rotation as long as this foot pedal 45 is depressed.

When thereis no pressure of course on the foot pedal 45, the winding drum 38 is free to rotate.

Referring now for the moment to the main drive cable A it is first formed in two pieces, one end of each piece being secured to a grooved drum 46, one end of each cable being fastened to this drum and at the opposite sides thereof, and also; one passing over the drum and one to pass under the drum so that as one piece unwinds, the other piece will wind on the drum. -These two pieces of the cable are guided by the two sheaves 47 which are mounted in a suitable bracket 48 secured to the main frame of the paver 1. This drum 46 is also suitably mounted on bearings in the main frame and is driven through gear connections 49 by a small motor or engine 50, (Fig. 2) also mounted on the main frame of the paver. Any suitable form of motor or engine may be used of sufficient power to revolve the drum 46 with the cable and load attached thereto. One piece of the cable runs on the sheave 35 and out over the rollers 31 and over the end sheave 28, and is secured to the far side of the bucket carriage 23 by an eye bolt 51. The other piece of the cable extends down under the lower sheave 36 and beneath the boom to the opposite end of the bucket carriage 23, an eye bolt 52 securely fastening the same to the carriage. WVhen the cable A is thus connected it in reality forms an endless cable, and when the winding drum is driven by the aforesaid motor in one direction a portion of the cable will wind off the drum to move the carriage, while the other portion of the,

cable will be taken up by the drum.

Referring now more in detail to the bucket carriage 23, it will be seen that it consists of the side members 53 on which are freely mounted the small wheels 22 which wheels as heretofore mentioned run along the lower flangesof the side frames of the boom.

End pieces 54 of the carriage are shown which are riveted or otherwise secured to the side frames of the carriage and extending downwardly from the carriage are the supporting arms 55 for the bucket. These arms are securely riveted to the carriage, there being four in number and extend slightly at an angle tothe walls of the bucket, as clearly shown in Figs. 4 and 5. The aforementioned side members 53 of the carriage are enlarged and extend slightly downwardly at their center portions as at 56 and are provided with bearings 57 for the reception of a rotatable shaft 58.

' On this shaft is mounteda revoluble sec tor 59 which when operated permits the contents of the bucket to be discharged or holds the doors of the bucket in locked position, as will be more fully described. "Referring more 'in detail to this sector, as clearly shown in Figs. 6, 8, 9 and 10, it will be seen that it is preferably a-single casting having the cored portions 60 and 61, and consists of an arcuate centrally de- I pressed rim 62 for the reception of the tripping cable B which will be hereinafter fully explained.

This arcuate rim extends for a distance slightly less than 180, the upper portion then being sharply bent downwardly as at 62', and at the end of this portion a lug 63 with an opening 64 therein is formed. At the central point of this sector 59 there is formed the bearing 65 which is enlarged or reinforced. with a hub and directly above the same is a further bearing and hub 66, which hub may be connected to the first hub by the web 67. Located below the lug 63 and opposite the bearing 65 is a further drilled lug 67, the purpose of these two lugs 63 and 67 being ,for the reception of a connecting bolt 68 which will be held in position at its lower end by the nut 69, while the other endof the boltis fastened to one which the other end 7 8 of the cable B will pass, this end likewise being secured to a bolt 74 which passes through the connecting wall 75 of the cored portions, so that a nut 7 6 may secure this eye bolt and the end of the cable 73.

Referring now to this cable B, it is like wise formed of two pieces, one end of each piece being secured to the groove winding drum 38, one end of course being secured to one side of the winding drum at the top, and one end being secured to the winding drum on the under side so that a rotating of this drum will let out one portion of the cable and correspondingly take up the other.

One piece of the cable runs out on the top ,of the boom resting on the aforementioned rollers 31, passing over one of the sheaves at the end of the boom and then lying within therim 62 of the sector 58, passes over the top thereof and is fastened to the upper portion of the sector at its end 70 by the aforementioned bolt 68. The other portion of the cable B runs out beneath the side frames of the boom, also lies within the rim of the sector 58 and is fastened: at its end 73 to the lower portion of the sector.

As far as the description has proceeded it will be seen that-on a revolution of the upper drum 46 in one direction, the carsure be applied to the foot pedal 45 and the smaller drum 38 held from revolving and the cable B from unwinding, inasmuch as the carriage is moving forwardly, the lower portion of the cable B held a ainst moveinent will pull the sector from t e lower end and cause it to revolve to the right to the positiorrshown in Fig. 6. In the same manner when the carriage is being moved inwardly a pressure on the brake pedal 45 will hold the cable B from movement and this time the movement of the carriage inwardly will cause the pull to be on the opposite portion of the cable and on the upper end of the sector, thereby causing the sector to be pulled back to its normal position, Fig. 3.

. In other words the carriage must move when the cab-leA is driven by the motor and if the cable B is held from winding and unwinding on the drum, a pull must be applied to the sector which will cause it to be revolved to one position or returned to its opposite position, depending on which way .the bucket is traveling. 1

Referring again to the axle or shaft 58 on which the sector 59 is mounted, there will be noticed at one end of the same a casting 77 s which is pinned or otherwise secured to the shaft and in which is fastened an offset handle 78 so .that if desired at any time to thereby forcing the sector to assume its normal position.

Referring now to the bucket 80 and to the connecting means between the bucket and the sector 59, it will be seen that the bucket is rounded at one end as at 81, while its opposite end 82 is fiat, as may be seen in Fig. 5. The arms 55 are riveted or otherwise secured to the sides 83 of the bucket and a reinforcing rib 84 is shown surrounding the inner upper edge.

At the rounded end 81 of the bucket, an encircling plate or saddle 85 is shown in which two drilled bosses 86 are provided in, which are placed pintles 87 for the hanging of the bottom doors 88. The flat end 82 of, the bucket is also provided with a plate 89 in which are formed the bearings 90 for the reception of pintles 91 for supporting the opposite ends of the bottom doors 88. The plate 89 is securely riveted to the forward end of the bucket and may be reinforced with any desired number of ribs. The lower side walls 92 at the forward end of the bucket extend inwardly .as clearly shown in Fig. 11, and the angular position of these side walls extend a little over half the entire length of the bucket and are then flanged as at 93 where-they. meet the round rear end of the bucket. I

It is to be noted that at the outer ends of these bottom doors are provided castings 94 which are supported by the aforementioned pintles, these castings being substantially triangular in shape and are securely riveted at their bases to the doors 88. By providing the pivotal point for these doors as shown, it will be noticed that they are free to swing away from each other and 'the center of the bucket, and at the same time to swing towards the Sides of the bucket, so that only a minimum amount of clearance is needed between the doors and the ground, whereas if these doors simply dropped and their pivotal point was at the rear edge of the doors they would have to swing downwardly to a far greater distance.

Located about midway the length of each of these doors are the eye-bolts 95 to which are connected the two supporting rods 96,

these rods, extending upward to a point above the top wall of the bucket and passing through bevel openings 99 in the opposite ends of a plate 100 where they are held by the nuts 101.

This plate shown in detail in Fig. 7 is provided on its lower surface with the boss 102 and central opening 103, andgon its top surface with two upwardly extending flanges 104. Below the plate is positioned a spring 105, the upper end of which encircles the boss 102, and the lower end of which rests on a plate 106 which is also provided with a positioning hub 107. Passing through an opening in this lower plate 106 and through the opening 103 in the plate 100 is a large bolt 108 which in turn passes through a central opening 109 in the bottom of a yoke member 110 which will be shortly described, the lower end of this yoke member slidingly fittin between the two flanges 104 on the top 0 the plate 100.

Referring now to this yoke member 110 it will be seen that it consists of the two arms 111 and 112, the latter being bent outwardly as at 113 so as to provide sufficient clearance for the sector 59. This yoke member is provided with openings at the upper ends of its upper arms so that it may be supported on a shaft 114', which shaft passes through the aforementioned bearings 66 in the sector 59. It is also tobe noticed that the upper ends of the two arms of this yoke member extend sharply at an angle to their lower portion so that when the sector 59 is in the position shown in Fig. 3, the upper end of the yoke member will extend sharply at an angle to their lower portion so that-when the sector 59 is in the position shown in Fig. 3, the yoke member will extend outwardly from the sector to a point opposite the main central axis of the sector and then inwardly so that if a line were drawn from the pivotal point of this yoke it would pass behind the.

central axis of the sector and at its lower end meet with the lower ends'of the yoke. This being offset this way provides sufiicient clearance for this yoke member and the central axle or shaft of the yoke member.

When the sector is revolved to the position shown in Fig. 6 the yoke will assume theposition there shown and the supporting rods of the bucket 96 will move from the vertical, as of course the yoke now has .moved a slight distance to the right.

It will be clearly understood from the description of this sector, its central axis and the eccentrically pivotedyoke and the bucket arms that when the sector is in its normal position the spring and the yoke being in its uppermostposition will keep the doors in the bottom of the bucket closed,

and as long as the upper pivotal point of the yoke is to'the left, (Fig. 3) of the central axisof the yoke, the doors will remain closed, and regardless of the weight of the material in the bucket it will be impossible for them to open.

outwardly to empty the contents of the bucket. I

From the foregoin description it will be seen that all that 1s necessary to doto discharge the bucket will be to place a pressure on the foot pedal 45 so that the cable B is held against movement and if the carriage is being drawn outwardly by the cable A the pull applied through the cable B- to the lower end of the sector 59 will cause thesame to revolve to the position shown in Fig. 6, thereby moving the upper pivotal 1 po-lnt'of the yoke beyond the central axis by the cable- A, the cable B being held against movement will apply the pull to the top of the sector, causing it to revolve to its normal position and drawing the pivotal point of the yoke over back beyond the central axis'of the yoke, closing the doors and locking them in their closed position.

Also from the foregoing it will be seen that by providing the small drum 38 on the boom and the two sheaves under which the main cable A travels it will be possible to swing the boom in a horizontal direction without in any way changing the centers of either ofthese cables. In other words, the tripping cable is wholly within the boom and although the cable A extends up to the winding drum provided on the paver it will also remain correctly centered.

Furthermore, 'the means for applying pressure to the drum 38 on which the small cable is secured will operate regardless of the horizontal position of the boom.

By providing a structure as shown, a boom and bucket is provided wherein" the bucket may be emptiedat any point along the boom and may be emptied while the bucket is traveling, thereby providing a bucket that may be rapidly and quickly dis charged. Also the doors may .be shut while the bucket is on its inward travel which will save material time and should the operator forget to close the doors of the bucket they will automatically close by the upper end 79 of the handle contacting with the nornial position.

If for any reason it is desired to open the doors of the bucket by hand this may be done by simply pulling the handle over which will revolve the sector, permitting the doors to open. v

Furthermore bypivoting the doors in the bucket as shown, very little clearance is needed so that the bucket may be operated as close to the ground as desired, thereby preventing any' splashing of the cement when delivered.

The boom and bucket construction is one that has proved veryeflicient in action and much time may be saved in its operation as compared with the other forms now in general use.

Many slight changes might be made without departing from the spirit and scope of the invent-ion and it is to beunderstood that the boom and bucket might be easily and readily installed on pavers of different constructions than here shown.

Having thus described my invention, what I desire to claim and secure by Letters Patent is 1. In combination with a boom, a carriage adapted to travel along said boom, a bucket with drop doors supported by said carriage, a cable for moving the carriage along the boom, a revolvable sector having a rim supported in said carriage, supporting means connecting the doors of the bucket to said sector at a point between its axis and its rim and said sector when in its normal position holding the doors of the bucket in their closed position, a second free running cable connected to the upper and lower ends of said sector and said cable extending around the rim of the sector and means for holding the second cable against movement to there by cause the sector to revolve as the bucket continues in its travel to thereby cause the doors of the bucket to swing to an open position.

2. In combination with a boom, a carriage adapted to travel on said boom, a bucket secured to said carriage, said bucket provided with swinging doors, a cable for moving the carriage and bucket along the boom, a pivotal sector having a rinT mounted in said carriage, supporting means con; hected to the door and pivotally connect-ed to the sector and above the pivotal axis'of said sector, and the normal position of said sector being such that the upper end of the supporting means lies in a plane to one side of a vertical plane through the pivotal axis of said sector to thereby cause the doors to normall remain in a locked position, a second ree running cable having its one end passing around the rim of the sector 'and connected near the bottom of the sector and the other passing around the rim and connected near the top thereof, means for hold: ing the free running cable while said bucket is travelling in one direction to cause the sector to revolve and the doors to open, and to return the sector to its normal position when the bucket is travelling in the opposite direction to thereby close the doors.

3. In combination witha boom, a carriage' adapted to travel on said boom, a bucket secured to said carriage, said bucket provided with swinging doors, a cable for moving the carriage and bucket along the boom, a pivotal sector having a rim mounted in said carriage, support-ing means connected to the doors and pivotally connected to the sector between said rim and said pivotal axis, the normal position of the said sector being such that the upper end of the supporting means normally lies in a plane to one side of a vertical plane through the pivotal axis of said sector to thereby cause the doors to normally remainfin a locked position, a second free running cable having its one end passing around'the rim of the sector and connected near the bottom thereof and the other end passing over the top of the rim of sector and connected near the top thereof, means for holding'the 'free running cable while said bucket is travelling in one direction to thereby cause the sector to revolve and the doors to open, and to return the sector to its normal position when the bucket is travelling in the opposite direction to thereby close the] doors.

4. In combination with a boom, a carriage adapted to travel along said boom and a bucket supported by said carriage, said bucket provided with bottom doors, an endless cable for moving said carriage and bucket along said boom, a shaft mounted transversely of said carriage and asector having a rinr mounted onsaid shaft, supporting means pivotallyconnected to said sector at a point between the pivotal axis of V the sector and the rimJth'e other end of said supporting means connected to the doors of said bucket, said sector when in one position holding the doors in a supported and locked position, a free running cable having its ends connected to the sector one above and one below saidishaft, means for halting said freerunning cable when said bucket and carriage are travelling so that the pivotal will pass to the. oposite side of the vertical plane drawn through the said shaft to thereby permit the doors to open and the halting ofsaid free running cablecausing the sector to revolve and the doors to: be closed when the bucket and carriage are travelling in the opposite direction, the opening and closing bucket provided with doors' supported by said carriage, an endless. cable for moving the bucket and carriage along said boom,

means for both opening and closing the doors of the bucket depending upon the directi n of movement of the carriage and 110 point of the supporting means on the sector bucket along said boom comprising, a revolvably mounted sector, supporting means connected to said sector at a point between its pivotal axis and its arc and to said doors, a free running cable connected to the sector and near the opposite end of its arc and por-' tions of the cable extending along the arc of the sector, means for halting said free running cable while said bucket and carriage are travelling outwardly to thereby revolve the sector to bring the upper end of the supporting means to a point to one side of a vertical plane drawn through the pivotal axis of the sector and to thus allow the doors to open, and return said sector to its normal position to close the doors when said carriage and bucket are traveling inwardly.

6. In combination with a boom, a carriage adapted to travel on said boom, a bucket supported by said carriage and pro-. vided with doors, a cable for moving said bucket along said boom, a rotatably mounted sector supported, in said carriage, supporting means for the doors pivotally con nected to the sector at a point between its central axis and its arc and normally to one side of the axis of said sector, the other end of said means connected to the doors of the buckets, said sector when in its normal position holding the doors in a supported and locked position, a second free-running cable having its ends passing around the arc of the sector and secured near the opposite ends of the arc, a drum, the said second cable connected to said drum, means for stopping the drum to halt the cable in its travel while said carriage and bucket continue to travel in one direct-ion to thereby revolve the sector so that the pivotal point of the support will pass to the other side of the central axis of the sector and "cause the said doors to open, and to return the sector and close the doors, when the carriage is traveling in the other direction.

7 In combination with a boom, a carriage adapted to travel on said boom, a bucket provided with doors and secured to said carriage, means for moving the carriage and bucket inwardly and outwardly on said boom, a pivotal sector mounted on said carriage and having a limited forward and rearward movement, a yoke eccentrically mounted on said sector and at a point to the rear and above the central axis of said sector when said sector is in its rearmost position, rods connected with said yoke and with the doors of the bucket, and said sector, yoke and rods holding the doors closed when the sector is in its rearmost position, a drum mounted on the boom, a cable endless in form connected to said drum and having portions thereof passing through a part of the arc of the sector and connected near the opposite ends of the arc of said sector, means for holding the drum and cable from movement while said carriage and bucket continue to travel to thereby swing the sector to its forwardmost position to thereby lower the yoke and rods and permit the doors of the bucket to open.

8. In combination with a boom, a carriage mounted on said boom, a bucket pro-- vided with doors and said bucket supported by said carriage, a rocking sector mounted in said carriage, a cable secured to the opposite sides of said carriage and means for operating the cable to cause the carriage and bucket to travel inwardly and outwardly on said boom, a yoke eccentrically mounted on said sector, tie rods connecting said yoke with said doors, said sector normally holding the doors in a closed position, a second cable endless in form having its opposite ends contacting with the included arc of the sector supported thereby and secured near the opposite ends of said are, a drum mounted on said boom, and said second cable passing around said drum, means for holding the second cable from movement while said carriage and bucket continue to travel to thereby cause the sector to revolve in one direction to permit the doors 'to open and to revolve said sector to its normal position to thereby close the doors when the bucket is traveling inwardly.

9. In combination a boom, a carriage traveling on said boom, a bucket supported by said carriage, doors pivotally mounted to theends of the bucket and forming the bottom of the bucket, rods pivotally connected to the doors and to a plate at their upper ends, a yoke supporting said plate and spring means-interposed therebetween, a pivotally mounted sector in saidcarriage and said yoke pivotally and eccentrically mounted on said sector, said sector when in its normal position holding the doors in a closed position, a cable for moving the carriage along the boom and a second cable,

connected to the sector in said carriage, said second cable normally free to travel, and

said opening, a second plate at the lower end of the bolt and a spring betwee said plates, so that the load on said-rods will be transferred'through said spring to said second plate, a yoke supporting said bolt and a trip sector for supporting said yoke,

means for mo'ving the bucket along the boom, and means for operating said sector to permit the doors of the bucket to open.

11. In combination a boom having a rack at its pivotal end, a worm cooperating with said rack and means for operating said rack to swing the boom, a carriage traveling on said boom and a bucket carried by said carriage, a cable for moving the bucket along the boom, a sector mounted in said carriage, doors forming the bottom ofthe bucket and means connected with said sector and said doors 'for normally holding the doors in a closed position, a second cable connected to. the sector and said cable normally free to move with the carriage, means for holding this cable against movement when said carriage is moving to thereby revolve the sector and permit the door of the bucket to swing open.

12. In combination a boom comprising side frames provided with. flanges, a carriage provided w th wheels and said wheels traveling on said flanges, a bucket supported by said carriage and provided with doors forming the bottom of the bucket, rods connected to the doors and a, yoke connected to the upper ends of said rods, a sector revolubly mounted in said carriage, and said yoke pivotally mounted to the sameand eccentrically therewith, a cable for moving the carriage and bucket alongthe boom, a second cable wholly mounted on the boom and secured to the upper and lower portions of the sector, a drum mounted on said boom and the ends of the cable secured to an upper-and lower side of said drum, said drum free normally to revolve, a brake on said drumto hold the same against move: ment' to thereby cause the cable to pull on .the upper and lower parts of the sector depending on the inward and outward "movement of the carriage to cause the sectorto' revolve to thereby. permit the doors of the bucket to open and to also close the doors l and return the sector to its normal position.

' bucket and supported at their ends to the- 13. In combination a boomand a bucket, a carriage supporting said bucket, said bucket provided with sloping side walls at its one end, doors forming the bottom of the ends of the bucket, the doors when operated I swingingabout an axis above the normal plane of the doors, rods secured to the doors,

a revoluble member mounted in said carriage, ayoke, spring means interposed between the rods and said yoke and said yoke pivotally mounted on said revoluble mem-' ber, said doors being closed when the revoluble member is in its normal position and means for operating said revoluble member to-permit the yoke and rods to lower-to thereby allow the doors to swing open,

'14. ,In' combination a boom and a bucket, a carriage supporting said bucket, said for the reception of the other ends of said v rods, a second plate and a bolt connecting said second plate with said yoke, a spring interposed between said plate so that the load will be transferred through said spring to said second plate, said sector when in its normal position, through said yoke and rods holding the doors intheir closed position,

and means for revolving the sector so that the pivotal point of the yoke will swing outwardly to thereby lower the yoke and rods and permit the doors to open.

15. In combination a boom and a bucket,

a carria e on said boom and supporting said buc et, a shaft mounted laterally of said carriage, a revoluble sector mounted on said shaft, said sector having a depressed rim for, the reception of a cable, the rim of the sector bent sharply downwardly at its top portion, and lugs formed beyond the end of said downwardly extending portion of the rim for the reception of means for securing an end of the cable.

16. In combination a boom and a bucket, a carriage for supporting said bucket, a shaft mounted on the carriage, a revoluble sector mounted on said shaft, said sector having a depressed rim and the upper portion of the rim extending sharply downa the periphery of said sector havingadepressed rim, the upper end of the rim extending sharply downwardly towards the axial point of said sector, a lug formed opposite the axial point of said sector anda further lug formed at the end of the downwardly extending portion of the rim,

a portion of the sectorbeing cored to leave a wall, a passageway located at the lower end of the rim of the sector connecting with a cored portion and the retainingwall provided with an opening, said lugs and said passageway and the opening in the wall forming securing points for the ends of a cable.

18. In combination with a boom and a bucket, a carriage on said boom and supporting said bucket, said bucket provided with doors, a cable having its opposite ends secured to the carriage for moving the said carriage and bucket inwardly and outwardly on said boom, a shaft mounted laterally on said carriage, a rocking sector mounted on said shaft, the rim of the sector having a groove formed therein, supporting means cooperating between the sector and the bucket doors, the sector and said supporting means forming a toggle lock, a drum mounted on said boom, a second free running cable operated bv said drum, and the ends of said second cable attached near the opposite ends of the included arc, and said cable and said sector so arranged that when a part of the second cable leaves the groove of the sector, another part thereof will engage the groove, means for halting said second cable while the said carriage is travelling to thereby break and close the toggle lock and thus open and close the doors of the bucket, the breaking and closing of the toggle and the opening and closing of the doors depending upon the direction of travel of the bucket along the boom.

19. In combination with a boom, a carriage adapted to travel along said boom and a bucket supported on said carriage and provided with bottom doors, a cable for 0 rating said carriage and said bucket a ong said boom, a sector pivotally mounted in said carriage and the included are of said sector formed with a groove for the reception of parts of a second cable, the upper terminus of the arc and groove of the sector extending downwardly towards the pivotal axis of said sector, supporting means pivotally secured to the sector and to the doors of the bucket, the sector and supporting means forming a toggle lock for holding the doors of said bucket closed when the sector is in its normal position, a second free running trip cable, endless in form and having its opposite ends passing within'the groove in the arc of the sector and secured near the opposite ends of said arc, means for halting the trip cable while the said bucket and carriage continue to travel to thereby rock the sector and break or close the toggle look, a portion of the cable paying off the sector and another por tion of the cable being taken up on the sector during the rocking movement of the sector, and the rocking of the sector thus openin and closing the doors of the bucketdepen ing on the forward or rearward movement of the sector and on the direction of movement of travel of said bucket along said boom.

In testimony whereof I aflix my signature.

CHARLES E. FOOTE.

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