US3135405A - Containers - Google Patents

Description

June 1964 N. F. WENDER ETAL 3,

CONTAINERS 3 Sheets-Sheet 1 Filed April 2'7, 1961 mm 3 2% M,M {7761M ATTORNEYS June 2, 19 N. F. WENDER ETAL CONTAINERS 3 Sheets-Sheet 2 Filed April 27, 1961 J. aw

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ATTORNEY r CONTAINERS Neil Wander and 301m M..Lynch, Knoxville, Tenn, assignors to Dcrnpster Brothers, Ina, Knoxville, Tenn a corporation of Tennessee Filed Apr. 27, 1961, Ser. No. 106,931"

11 Claims, ((31. 214-462) I This invention relates to improvements in containers of the character adapted for "use in collecting and transporting materials. I

- United States PatentO One satisfactory way of handling loose material is to provide containers of-suitable size into which the material can be deposited. In the collection of refuse, for example, several containers may be placed at convenient'lo cations and emptied from time to time as they are filled.

Such containers may be provided with a drop bottom door which opens for dumping the contents from the container. Normally the container is filled while sitting on the ground or other supporting surface, and the material is placed in the container through doors provided for this purpose.

in the upper portion of the container.-

After the container is full it may be lifted onto a'.vehicle by means of a hoisting apparatus on the vehicle, and then transported to a point where the contents of the con tainer are damped. The empty container is then reeassess le Patented June areas ing to establish a detachable connection between the container and the lifting arms.

In this type of front end loading equipment the fork arms extend alongthe outside of the container and fit into pockets at the ends of the container provided for receiving-the fork arms. Actuation of the lifting arms and the fork arms-by suitable power means is effected in order "to lift the container over the cab of the vehicle to a position above the body of the vehicle so that the contents of the container may be'dumped through a hopper into thebody. The empty container may thereafter be swung I back to a position on the ground in front of the vehicle.

When containers are emptied by such front end loading equipment, it is not necessary to transport the containers themselves to a distant location for dumping. A vehicle equipped with this type of front end loading equipment and with a suitable body is driven from point to point where various containers are located. One after another the full containers may be emptied into the body of the vehicle, and once the body is full, then the vehicle can make a trip to the dumping area and the contents emptied from the-body. In this manner, it is not necessary to returned to the same location'or to a new location for I refilling.

The drop bottom door provided on such containers is hinged to the body of the container so. that it may swing downwardly therefrom. When the container is resting V uponthe ground, the drop bottom door is closed and fits snugly with the bottom portion of the container to pro vide a closure therefor.

Hoisting apparatus for handling this type of drop bot tom container is disclosed in prior Patents; for example,

V ,Patent No. 2,281,183, issued April 28,1942, and Patent 5N0. 2,369,722, issued February 20, 1945,. In the operation of this type of hoisting apparatus for lifting a drop bottom container onto a vehicle, the container is picked up in a manner whereby the drop bottom door is held closed during the transporting of the container to thedumpinglocation. When it is desired to dump the contentsffrorn the container, the body of the container is held in an elevated position and the drop bottom. door is allowed to swing downwardly thereby opening the bottom portion of the body so thatthe' material is free to flow from the container.

Such hoisting'apparatus used for handling dropbottom; containers inherently provides that the drop bottom doorwill be held firmly closed when the container is lifted onto orlowe'red from the tran'sportinglvehicle. When such containers are resting upon. the ground or other support- I ingsurface, the body portion of the container fits snugly over the dropbottom door and the weight of the body portion prevents an inadvertent. opening of the bottom portion of the container.

. Other types of'equipment used in handling containers Y b which hold loose materiahfsuch' astrash for example, are r referred to generally as front endlo'aders or front end loading equipment, These typcsof hoisting equipment usually employ a pair of lifting arms which are pivotally I connected to thetransporting vehicle and extend to the front of, the vehicle wherea connection is established be-- tween the lifting arms and the container. Qnesuch type -of'front end loading equipmentis shown, for example,-

" j in Patent No. 2,900,096, issued August 18, 1959, where v in the front end loading equipment" includes," in'addition to the pair of lifting arms, a'front' torques tube extending acrossthe vehicle and'connectingthe lifting arms, and a patrol? fork arms mounted on the torqueitube servf move the containers from the filling location, and the number of trips which the vehicle must make to the dumping location can be minimized.

. The containers used in connection with front end loading equipment generally include a bottom which is integral 7 with or permanently connected to the body portion of the container. Suitable types of openings are provided at or near the top portion of the body of the container through which-material may be placed in the container.

In the use of containers of the type which are employed with front end loading equipment it is not necessary that the bottom of the containers be provided with a drop bottom door. In fact, it is absolutely essential that during the dumping operation of these containers, the bottomfportion of the containers remain fixed or closed.

When the lifting arms of the front end loading equipment swing a container upwardly, the material within the container rests on the bottom of the container. Therefore, it v It is important to note 'in this'connection that the two types of containers previously described, and the two types of hoisting apparatus, have become very successful ,in the past; Consequently,there are in existence a large number ofboth types of containers and a large number of both types of equipment used for hoisting these con- I tainrs. Consequently, it is necessary, when con'sidering the problem ofproviding a container which can be ac: commodated byboth types of hoisting apparatus, that the hoisting apparatus itself not be modified because it is "necessary. that such hoisting apparatus still be available for usefi'n connection with the two diiferent types of containers b, Accordingly, it is the primary object of this invention to providea device'for use inconnection withdrop bot tomtcontain'ers whereby such containers may be used vwith front end loading equipment as'well as other, types of 2 hoisting apparatus.

This may be accomplished by providinga'sle'eve .as-i I v sembly on each opposed end wallfo f'the drop bottom container. Each assembly includes a sliding sleeve memher which can be adjusted to a rearward position so that hoisting apparatus may be employed in connection with the drop bottom door, or to a forward position so that front end loading equipment may be employed to handle the container. A plate member is connected to and movable with the sliding sleeve member, and has a notch at its forward end for receiving therein a pin on the drop bottom door. When the sleeve member is moved to its forward position the pin and plate cooperate to hold closed the drop bottom door.

This embodiment of the invention is illustrated in the accompanying drawings, in which:

FIG. 1 is a side elevation view of a vehicle equipped with'hoisting apparatus for use with containers which have a drop bottom door, and shows in full lines and broken lines a container embodyingcertain aspects of this invention;

. FIG. 2 is a side elevation View of a vehicle equipped with front end loading equipment, and shows in connection therewith the container illustrated in FIG. 1;

FIG. 3 is an enlarged side elevation view of a sliding sleeve assembly;

FIG. 4 is an endelevation view corresponding with FIG. 3, wherein a portion of the container isshown in cross section; and

. FIG. 5 is a sectional view taken along line 55 of FIG. 3.

In FIGS. 1 and'2 there is illustrated a container 16 of the type having a drop bottom door 12 hinged, or other wise pivotally connected at 14 to the body of the container. This type of drop bottom container is adapted for use with any form of hoisting apparatus suitable for accommodating such drop bottom containers. This hoisting apparatus might include either a truck mounted hoisting unit, as shown in Patent No. 2,281,183, issued April 28, 1942; a self-propellcd vehicle, as shown in Patent No. 2,751,100, issued Iune19, 1956; a hoisting unit of the character shown inPatent No. Re. 23,546, issued September 9, 1952; or a fork lift type of hoisting unit. In FIG. 1, the container 10 is illustrated in connection with oneform of hoisting unit, but it will be understood that the container 10 may be used with any other form of hoisting apparatus capable of handling drop bottom type containers.

The form of hoisting apparatus 19 shown in FIG. 1 is mounted on a self-propelled vehicle, 15 having a chassis indicated generally bythe numeral 16. A subframe assembly 18 is mounted on the chassis 16 and includes a bucket rest 20 for supporting the container 10, which as illustrated in FIG. 1, is located at the rear'end of the chassis 16. The container 10 is adapted to be pulled upon and held against a carriage assembly 22 which is capable of movemment forwardly and backwardly relative to the chassis 16, as described in detail in Patent No. 2,281,183. A pair of booms 23 are.located above the chassis. 16 and have swinging movement in a vertical direction.

The drop bottom door 12 of the container 10 is hinged at 14 to' a front wall 24 at the bottom of the body portion of the container. The container 10 is providedwith a rear wall 25 and opposed end walls 26 having notches 28 thereinat the bottom for receiving upwardly extending triangular-shaped end plate 30 of These endplates 30 are the drop bottom door 12. shaped to fit within the notches 28 when the drop bottom door 12 is closed.

The end plates 36 have fixed thereto lifting pins or lugs 32 which protrude outwardly from' the end plates 30 for connection by a chain 34 or other type of flexible member of the hoisting apparatus. 19. The chains 34 are connected'to the upwardly extending ends of' the booms 23. When the free ends of the chains 34 are connected with the lifting pins 32', and when the booms 23 are swung upwardly, the container 10 ishoisted from ary 3, 1956. When the body portion of the container 10 is held suspended on the carriage assembly 22, the

booms 23 may be lowered, thereby allowing the drop bottom door 12 to swing downwardly, as illustrated in broken lines in FIG. 1.

The servicing of a full container 10 by a vehicle 15 equipped with the hoisting apparatus 19 is carried out as follows. The vehicle 15 is backed up to the container 10 as the container rests upon the ground or other supporting surface. The chains 34 are connected with the lifting pins 32 on the end plates30, and the hoisting apparatus 19 is actuated to lift the container 10 onto the vehicle chassis 16. The container 10 is then transported to a dumping location where the hoisting apparatus 19 is actuated to open the drop bottom door 12 in order to allow the contents of the container 10 to fall out.

The hoisting apparatus 19 is then actuated to close the drop bottom door 12, and the empty container 10 may be returned to the same location or transported to a new location for refilling. Then the container 10 is lowered onto the ground and the chains 34 disconnected so that the vehicle 15 may be employed to service other containers in a similar manner.

In FIG. 2 there is illustrated one type of front end loading equipment which maybe employed to empty the contents of the container 10. It is customary to use a vehicle of the character generally indicated by the reference numeral 40 which is self-propelled under the control of an operator located within a cab 42.

A body 44 is provided on the vehicle chassis behind the cab 42 and may be of any suitable type for receiving the particular material to be handled, and may be provided with packer mechanism for compressing the material, if this is desired." The top portion of the front of the body 44 is provided with a filling opening or hopper 46 through which material may be dumped into the body 44. The character of the body otherwise may be varied as desired.

The front end loading equipment or hoisting apparatus used in connection with the vehicle 40 is indicated in FIG. 2 by numeral-50 and includes a pair of lifting arms 52 spaced apart a distance corresponding substantially with the width of the cab 42. The lifting arms 52 may be of gooseneck shape or inverted U-shape, for example, so as. to extend over the top and downwardly in front and back of the cab 42, as illustrated in FIG. 2. 7 At the back of the cab 42 the lower ends of the lifting arms 52 are fixed ona rear, horizontally extending torque tube or rod 54 which extends substantially from one side of the vehicle 40 to the other. The torque tube 54 is journaled in bearingtboxes which are fixably mounted on the vehicle chassis. In this manner the lifting arms 52 are pivotally mounted to the vehicle 40. Lever arms 56 are fixed on the torque tube 54 and extend downwardly therefrom. The free ends of the lever arms 56 are pivotally connected at 58 to suitable power devices 60, such as a conventional hydraulically actuated cylinder and piston devices, which in turn are mounted on the vehicle chassis.

"At the front of the vehicle 40 the lifting arms 52 are connected by ahorizontally extending front torque tube or rodv 62 which is journaled in bearing boxes secured 1 tional hydraulically actuated'cylinder and piston device, is mounted on each of the lifting arms 52 by means of a bracket 68 so that the power device 66 extends along the corresponding arm 52. The free end of a piston rod 70 t of the power device 66 is connected to the free end of the corresponding lever arm 64. A pair of fork arms 72 are rigidly mounted'near opposite ends of the torquetube 62 and have attached to their free ends a tow plate 74.

On" opposite end walls 26 of the container 10 there is securely attached a sleeve assembly 100. Each of the sleeve assemblies 100 receives therein one ofthe fork arms 72 'of the lifting mechanism 50. The sleeve assemblies 100 will be described in detail below.

7 The hoisting apparatus 50 is operated as follows in order to dump the contentsof the container 10 into the body 44. -The power device 66 may be actuated under ,the force of hydraulic pressure in order to rotate the lever I arms 64 which in turn rotates the torque tube 62 so as to properly align the fork arms 72 for entrance into the sleeve assemblies 80. The lifting arms 52 may be pivoted about the axis of the rear torque tube 54 by operation tainer 10"while it is on the ground or other supporting surface in front of the vehicle 40, the vehicle is maneuvered into the proper positionand then the power devices 60 and 66 are operated so that the fork arms 72 are at the. proper angle with respect to the sleeve assemblies 80 so as to effect a suitable connection between the fork arm 72 and the sleeve assemblies 80. V

The power devices 60 are operated further to swing the lifting arms 52 upwardly whereby the container 10 is been moved toits extreme position towards the front or V ofv the power devices 60. In order to establish a connection between the lifting mechanism 50 and the conhoisted over the .cab 42 andinto dumping position at a the top and front of the body. 44. Simultaneously, the

"fork arms 72 may be actuated by the power devices 66 to rotate slightly in a counterclockwise direction, with reference 'to FIG. 2, so that the container 10 may be kept tilted slightly toward the vehicle but substantially upright during the swinging movement above the body 44. Once the container 10 is above the. hopper 46 the fork arms 7 2 may be actuated to rotate in a clockwise direction far enough so that the container 10 isinverted to dump the contents thereof through the hopper 46 and to the body 44.

After the contents of the container 10 are dumped in this manner, the'power devices 66 maybe actuated to rotate the fork. arms 72 so that the container 10 will in'front of the vehicle 40.

g As pointed out previously, the containers employed with the hoistingapparatus 19, illustrated ,in FIG. 1, are pro-' vided with drop' bottom doors. When the. body portions of such containers are suspended above the ground, these drop bottom doors are free to swing downwardly. When -,be returned to a generally upright position The'lifting' 'arms 52 then may be lowered by proper actuation of the powerdevices 60 to lower the container 10 to the ground it is desirous: to use these containers with thehoisting;

T apparatus illustrated in FIG. 2, for example, it is necessar'y that the drop'bottom doors of the containers be held 5 closed, but it is also ,jrlecessary that the drop bottom doors be ready for use again with the hoisting apparatus illusftratedinFIGnl. 'f- :y In FIGS. 3-5 there is illustrated the sleeve assembly which has'been referred; to previously! One such sleeve assemblyis provided on -each 'opposite endwall 26 0f the container-'10, and as described previously, is

. i adapted to receive therein a fork arm 72 of the hoistingapparatusitls,

.Each sleeve assembly 100 includes a hollow sleeve 1riern-.

her 102 which may be formed of a channel member and:

a plate member, for example, as illustratedin' FIGS.

andS. The sleeve member 102 provides an opening 7 extending longitudinally .therethrough for uncrbstructedi entrance offayfork arm 72; A suitable number of U- shaped braces 104arefixed to the end" wall 26 of the container 10, as'by welding, and each brace may be strength- 'ened by gussets 106 asnecessary. The sleeve member 102 fits loosely between the U-shaped braces 106 and the end the center of the container 10. l I

In order to hold the sleeve member 102 in either one of its extreme positions, a position adjuster 110 is provided The position adjuster 110 is mounted on the end wall 26 of the container 10 bymeans of an angle mernher 112 and includes a short sleeve 113 through which extends a plunger 114. 'An enlarged head portion 115 of the plunger 114 extends downwardly and outwardly of thesleeve 1'13. Within the sleeve 113 a spring 116 bears 'on the enlarged head portion 115 and tends to force the head portion 115 to its outwardly extended position.

A ring 118 which is larger in diameter than the sleeve 113 is connected to the upper end of theplunger 114 and extends upwardly abovethe sleeve 113 so as to be in a position to begrasped. Also, the ring 118 serves to prevent the plunger 114 from sliding out of the sleeve 113 due to the action of the spring 116.

The head portion 1150f the plunger 114 is adapted to fitinto either one of two holes 122 or 124 located in the top portion of the sliding sleeve member 102. The holes 122 and 124 are spaced apart a suitable distance longitudinally with respect to the sleeve member 102 so that when thesleeve member 102 is in the positionillustratcd in FIG. 1 the hole 124will be aligned with the head portion-115 of the position adjuster 110, and when the sleeve 1 member 102 is in the position illustratedin FIG. 2, the

hole 122 will be aligned with the head portion 115.

The top edge of the short sleeve 113 is provided with a shallow notch 126.. The ring 118 may be grasped and pulled upwardly thereby pulling the plunger 114 and the' head portion 115'upwardly and out of either one of the holes 122 and 124., Then the ring 113 may be twisted approximately 45 degrees in either rotational direction and released so that the spring 116 will pull the ring 118;-

downwardly and into the notch 126. When this is done, the headportion 115 is above the sleeve member 102 and the sleeve may be adjusted easily to either one of its extreme positions without interference from the head portion 115. After the ring 118 is turned to the position. illustrated in FIG. 3, thelower part of the ring fits int'o deep notches in the top edge of the sleeve 113 so that the head portion 115 may fit into either one of the holes 122 or 124. r r r v When itis desired to fuse the container 10 with the hoisting apparatus 19 illustrated in FIG. 1, the sleeve member 102 ofthe sleeve "assembly 100 canbe moved to'its rearward 'position'as illustrated in FIG. 1 and held in thisposition by the adjuster 110. The sleeve. member 102 isthenout of the wayof the chain's 34 0f the hoisting apparatus 19. The chains 34 thenfcan be con neeted easily to the lifting pins 32andthey are free to move with respect to the container 10 i as "m stered in FIG. 2 and held there by the adjuster 1111f When the sleeve 1112 .isin its forward position it is adjacent the center of the container 10. This creates a balanced condition when the fork arms 72 of the lifting apparatus 50 are insertedin thesleeve members 102 and employed to hoist the container 1i} above the vehicle 40. The fork arms 72 thereby apply theirlifting force In FIG. 2, the a without interference'from the sleeve member 102 '1 G n the other hand,'when it is desired to use'the container 10 in. connection with the hoisting apparatus 50 illustrated inFIG. 2, the sleeve member 102 of the I sleeveassembly. 100 canbe moved to its forwardposition 1 at a point suitably close to the center of the container 10.

Extending longitudinally of the'sleeve assembly 1% and parallel with the sleeve member 102 there is a rectangular shaped bar 130, the ends of which are rigidly fixed with the C-shaped end retaining members 108 on the sleeve member 162. Rigidly fixed to the bar 130 and depending downwardly therefrom beneath the sleeve meme her 102 there is a plate 132. The forward end of the plate is provided with a notch 134 which is slightly larger than the diameter of the pin 32 on the drop bottom door 12.

In FIG. 3 the sleeve member 102 is shown in its forward position. In this position, the plate 132 is moved to its forward position along with the sleeve member 192, and the notch 134 in the plate 132 receives the pin member 32. With the adjuster 110 having its head portion 115 extending into hole 122, the sleeve member 102 and in turn the plate 132 is locked in the position illustrated in FIG. 3, while a protruding portion 136 of the plate 132 extends beneath the pin 32.

With the sleeve assembly 101) adjusted to the position just described, the container is ready for use in connection with the lifting apparatus 50 illustrated in FIG. 2. I

The fork arms 7'2 may be inserted through the sleeve membersltiZ to establish a connection between the lifting assembly 50 and the container 10. As the lifting arms 52 are actuated to swing upwardly, the fork arms 72 in turn move upwardly in contact with the upper portion of the sleeves-102, and because the sleeve assembly 19.0 is secured firmly to the side 26 of the container 19, the container in turn will be swung upwardly. As the container 10 is moved upwardly in this manner, portion 13,6 of the plate 132 pulls upwardly on the lifting pin 32. Consequently, the drop bottom door 112 will be moved will not be free to swing downwardly.

The sleeve assembly 100 may be used with containers of various sizes so that they may be employed with front end loading equipment as well as with hoisting apparatus used in connection with drop bottom doors. Existing drop bottom containers may be converted to use with front end loaders, yet'they may still be employed as drop bottom containers. The notched plate 132 automatically latches closed. the drop bottom door, and automatically unlatches the door as the sliding sleeve 102 is adjusted to the desired position. I

While the invention has been illustrated and described in a certain preferred embodiment, it is recognized that other variations and changes may be made therein without departing from the invention as set forth in the claims.

We claim:

1. The combination with a container having a drop bottom door, of longitudinally extending sleeve means for establishing a connection with hoisting apparatus, said means being movable longitudinally, and means on the sleeve means and movable therewith for holding the drop bottom door closed.

2. The combination with a container having a drop bottom door, of sleeve means for establishing a connec-v tion with hoisting apparatus, said sleeve means being movable to various positions with respect to the container, means connected with the sleeve means and movable therewith for holding the drop bottom door closed; and means for holding the sleeve means in the various positions.

3. The combination of a container, a drop bottom do or hingedto the container, first hoisting means engageable with the door for hoisting the container, longitudinally door hinged to the body and serving as a bottom for the container when closed, pin members on the'door, and longitudinally extending sleeve members on the end Walls; said sleeve members being movable longitudinally, hoisting means engageable withthe pin members on the door for hoisting the container; second hoisting means engageable with the sleeve members for hoisting the container, said hoisting means being useable alternatively; and means on the sleeve members and movable therewith for holding the door closed when the second hoisting means is used.

5. The combination of a container having a body including front and rear walls andopposed end walls, a door hinged to the body and serving as a bottom for the container when closed, pin members on the door, and longitudinally extending sleeve members on the end walls; said sleeve members being movable longitudinally, hoisting means on a vehicle and engageable with the pin members on the door for hoisting the container onto the vehicle; second hoisting means on another vehicle having a body and engageable with the sleeve members for hoisting the container above the body, said hoisting means being useable alternatively; and means on the sleeve members and movable therewith for holding the door closed when the second hoisting means is used.

6. The combination with a container having a bottom discharge door, said door having a projection thereon extending outwardly from the. container, of sleeve means for establishing a connection with hoisting apparatus, said sleeve means being movable to various positions with respect to the container, means connected with the sleeve means and movable therewith for engaging said projec tion for holding the bottom discharge door closed.

7. The combination with a container having a bottom discharge'door, said door having a projection thereon extending outwardly from the container, of a sleeve for receiving a lifting arm of hoisting apparatus, brackets, said brackets being spaced apart and each having an opening therein, said sleeve extending through said bracket openings, means for securing the brackets to the container, and means on the sleevefor engagement with said projection upon longitudinal movement of said sleeve in said brackets, whereby the door is held closed during lifting of the container byv the hoisting apparatus.

8. Apparatus for establishing a connection between front end loading type hoisting apparatus and a container of the type having end walls and a bottom discharge door with upturned ends substantially coplanar with the end walls, and having projections on said door ends; comprising' a sleeve for receiving a lifting implement of said hoisting apparatus, said sleeve having an elongated bearing surface therein, bracket means adapted to be secured to-one of said end walls, means mounting said sleeve in said bracket means for longitudinal movement relative,

thereto, said bracket means overlapping said bearing surface of said sleeve, andmeans on the, sleeve for selectively engaging said projection upon longitudinal movement of said sleeve, whereby the bottom discharge door is held closed while the container is lifted by said hoisting apparatus.

9. Apparatus for use with a container of thetype having end walls and 'a bottom discharge door with upturned ends substantially coplanar with the end walls, and having aprojection'on each door end extending outwardly therefrom, said apparatus including a sleeve having an elongated bearing surface therein for engagement by a lifting arm of hoisting; apparatus, brackets for securing the. sleeve to oneof said end walls, said brackets overlapping a portion of said sleeve and said bearing surface, said sleeve bearing surface extending through said brackets and movable longitudinally insaid brackets, and aplate secured to said sleeve in position for selectively engaging said projection upon longitudinal movementof said sleeve whereby the door is held closed while the container is lifted by a hoisting apparatus engaging said sleeve.

10. Apparatus for establishing a connection between :-front end loading type hoisting apparatus and a container of the type having'end walls and a bottom discharge door with upturned ends substantially coplanar withthe end walls, and having a projection on each door end, comprising a sleeve for receiving a lifting implement of said hoisting apparatus, said sleeve having an elongated bearing surface therein, bracket means adapted to be secured to one of said end walls, means mounting said sleeve in said bracket means for longitudinal movement relative thereto, said bracket means overlapping said bearing surface of said sleeve, means 'on the sleeve for selectively engaging said projection upon longitudinal movement of said sleeve, and means for releasably holding the sleeve in a forward or rearward position, whereby the bottom with upturned ends substantially coplanar with the end' walls, and having a projection on each door end, comprising an elongated tubular sleeve having a bearing sur- 10 face therein for receiving a lifting implement of said hoisting apparatus, bracket means adapted to be secured to one of said end walls, means mounting said sleeve in said bracket means for longitudinal movement relative thereto, said bracket means encircling said bearing surface of said tubular sleeve, and means on the sleeve for selectively engaging said projection upon longitudinal movement of said sleeve, whereby the bottom discharge door is held closed while the container is lifted by said hoisting apparatus. I

References Cited in the file of this patent UNITED STATES PATENTS 2,289,024 Lambert July 7, 1942 2,369,722 Dempster Feb. 20, 1945 2,702,645 Dempster et a1. Feb. 22, 1955 2,900,096 Dempster et a1 Aug. 18, 1959 2,936,916 Dempster et al. May 17, 1960 2,938,641 Dempster et a1. May 31, 1960 FOREIGN PATENTS 364,731 Great Britain Jan. 14, 1932

Claims (1)

1. 3. THE COMBINATION OF A CONTAINER, A DROP BOTTOM DOOR HINGED TO THE CONTAINER, FIRST HOISTING MEANS ENGAGEABLE WITH THE DOOR FOR HOISTING THE CONTAINER, LONGITUDINALLY EXTENDING SLEEVE MEANS ON THE CONTAINER, SECOND HOISTING MEANS ENGAGEABLE WITH THE SLEEVE MEANS FOR HOISTING THE

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