WO2012085940A2

WO2012085940A2 - Pallet container with riveted cage

Info

Publication number: WO2012085940A2
Application number: PCT/IN2011/000877
Authority: WO
Inventors: Naveen Kumar JAIN
Original assignee: Genex Science And Technologies Pvt. Ltd.
Priority date: 2010-12-24
Filing date: 2011-12-20
Publication date: 2012-06-28
Also published as: WO2012085940A3; TW201236928A

Abstract

According to present application the invented pallet container is consisting of number of horizontal tube rings and number of vertical tubes which makes a grid. Each junction of vertical and horizontal tube is joined with the help of long rivets which passes from one side to the other through a hole made in the tubes. Rivets are having flat formation on one side and other side is flattened using special tools after passing it through the holes in the tubes. These rivets are pretreated for better environmental condition. The rivets are taking axial, radial and dynamic load acting on the pallet container and keeping the tubes in position. The connections in addition to riveting can also be reinforced by additional welds.

Description

PALLET CONTAINER WITH RIVETED CAGE

Field of invention:

This invention relates to pallet containers which can be used for transportation of liquid dangerous goods and more specifically to his outer cage wherein the connection of horizontal and vertical tubes at intersection points are done by riveting.

Background of invention:

Pallet containers are used for transportation of liquid dangerous goods. Pallet containers consist of outer cage made out of hollow steel tubes welded at their intersections, fixed on a pallet and holding a replaceable thin-walled rigid plastics bottle/ inner container having one filling opening on top and one emptying/discharge valve at bottom.

Pallet containers are consisting of 3 main components mainly inner container, a hollow tube outer cage and a bottom pallet. These 3 components are put together by screws, bolts and nuts.

The hollow tube outer cage structure is made of horizontal and vertical steel tubes which are joined together by resistance welding or arc welding at their intersections.

Pallet containers are preferably used for the transport of liquids. When transporting the filled pallet container in particular by truck, the filled in liquid is prone to considerable gushing motions which are generated by transport shocks, such as for example when a truck rides on bumpy roads. Thus, constantly changing pressure forces are exerted on the inner container interior walls, which in turn lead to radial vibration motion of the outer cage and results in continuous dynamic vibration stress on the outer cage.

Depending of the design of the outer cage, especially during long transport over bad roads, vibrational stress builds up to such an extent that the outer cage tubes gets fatigued and cracks occurs on the welding of the tubes. Normally during transportation pallet containers are kept one above the other. The outer cage of the lower pallet container has to carry complete load (approx. 1 100 kg min.) of upper pallet container, the welds of the top horizontal tube with the vertical tubes of the lower pallet container have the highest shear stress and when the welds cracks up because of load, vertical tubes start opening up and can pierce the upper pallet inner container making it leak and contents spills over. Another problem with welded tubes is that in corrosive atmosphere, weld joints gets corroded and starts releasing red substance which contaminates the whole pallet container, the pallet container becomes dirty and weak and gives very short service level.

Objects of the invention:

The main object of the present invention is to obviate the above drawbacks.

Another object of the present invention is to provide pallet containers with better long term resistance against the repetitive shocks occurring during the transport of the filled pallet containers.

Another object of the present invention is to provide pallet containers with the connection of the outer cage tubes done by riveting.

Another object of the present invention is to provide pallet containers with the connection of the outer cage tubes done by resistance welding and additional riveting.

Another object of the present invention is to increases the strength of the vertical/horizontal tubes joint against environmental pollution and bad climatically condition.

Another object of the present invention is to provide pallet containers pallet containers which do not fail during 1+1 stacking and transportation even on bad roads.

Summary of invention:

Accordingly the present invention discloses a pallet container comprising: at least one pallet (7); at least one storage means (2) configured to be mounted on said pallet (7) with closable filling means (3) and emptying means (5); an outer cage assembly (10) structure securely fixed to said pallet (7) to form a support jacket and to facilitate top lifting and stacking of said pallet container (1) wherein said outer cage assembly comprises of tube structures including vertical steel tubes (11) and horizontal steel tubes (13) fastened to one another at their intersections with at least one fastening arrangement for constituting additional rigid connections at the point of intersection of tubes securing the outer frame assembly in case of failure of any one of the fastening means.

The horizontal and vertical steel tubes are configured to be connected at points of intersection by riveting. The horizontal and vertical steel tubes are configured to be connected at points of intersection by riveting and welding. The horizontal and vertical steel tubes are configured to be connected at points of intersection by riveting and welding at some intersections.

The horizontal and vertical steel tubes are configured to be connected at points of intersection by welding and riveting at some intersections. The rivets are pretreated. The horizontal and vertical tubes are configured to be connected by riveting in line in the grid welding machine.

The rivets (16) are configured for sustaining axial,radial and dynamic load acting on the pallet container (1) and keeping the tubes of the outer cage (10) in position. The riveting of the top horizontal tube (14) with the vertical tube end (12) on the lower pallet container (1) is configured to sustain the dynamic top load from the top pallet container (1) at double stacking.

Statement of the invention:

Accordingly the present invention discloses a pallet container comprising :at least one pallet (7); at least one storage means (2) configured to be mounted on said pallet (7) with closable filling means (3) and emptying means (5); an outer cage assembly (10) structure securely fixed to said pallet (7) to form a support jacket and to facilitate top lifting and stacking of said pallet container (1) wherein said outer cage assembly comprises of tube structures including vertical steel tubes (11) and horizontal steel tubes (13) fastened to one another at their intersections with at least one fastening arrangement for constituting additional rigid connections at the point of intersection of tubes securing the outer frame assembly in case of failure of any one of the fastening means.

Brief description of drawings:

According to the present invention,

FIG. 01 shows pallet container according state of art.Detail "Y" will show the connection of a center horizontal tube with the vertical tube,

FIG. 02 shows resistance welding of cage tube crossing according the state of art (Detail Y), FIG. 03 shows riveting of cage tube crossing according to the invention (Detail Y),

FIG. 04 shows resistance welding and riveting of cage tube crossing according the invention (Detail Y).

Brief description of invention:

According to present application the invented pallet container is consisting of number of horizontal tube rings and number of vertical tubes which makes a grid. Each junction of vertical and horizontal tube is joined with the help of long rivets which passes from one side to the other through a hole made in the tubes. Rivets are having flat formation on one side and other side is flattened using special tools after passing it through the holes in the tubes. These rivets are pretreated for better environmental condition. The rivets are taking axial, radial and dynamic load acting on the pallet container and keeping the tubes in position.

Detailed description of the invention:

Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same. FIG. 01 shows a pallet container (1) according the invention. Pallet containers (1) for liquids are comprising of storage means an inner (plastics) container (2) equipped with a filling opening (3) closable by a screw cap (4) and a discharge valve (5) both with a hermetic seal, protected by an outer cage (10) and resting on a pallet (7).The outer cage (10) is built by vertical (1 1), horizontal (13,14) steel tubes riveted at their intersections .The outer cage (10) is bolted on a pallet (7) and the inner container (2) is placed inside of the outer cage (10) resting with his bottom end (6) on a pallet (7) as shown at FIG. 01.

FIG. 02 is showing the welded connections of vertical (1 1) and horizontal tubes (13) of the outer cage (10) according the state of art. FIG.02 illustrates the conventional resistance welding at tubes crossing with 4 weld points (15).

FIG. 03 is showing the connection of vertical (1 1) and horizontal tubes (13) of the outer cage (10) according the invention. Each junction of vertical (11) and horizontal tube (13) is joined by using long rivets (16), which passes from one tube side to the other through holes made in the tubes. Rivets (16) are having flat head (17) formation on one side and other side is flattened (.18) using special tools after passing it through the holes in the tubes. These rivets (16) are pretreated for better environmental condition. The rivets (16) are taking axial,radial and dynamic load acting on the pallet container (1) and keeping the tubes of the outer cage (10) in position. The riveting of the top horizontal tube (14) with the flattened vertical tube ends (12) has shown excellent field results, at double stacked transportation on bad roads, on the lower pallet container (1) by taking the dynamic top load from the upper stacked pallet container (1).

FIG. 04 is showing another version of the connection vertical (11) and horizontal tubes ( 13 , 14) of the outer cage (10) according the invention.

FIG.04 illustrates the riveting at cage tubes crossing, only one rivet (16) is used and the connection is additional reinforced by additional welds (15).

Grids for outer cages (10) with tube connections according FIG.04 are produced in the sequence first welding the tubes and afterwards riveting. The riveting can be integrated into the welding line of the grid. A combination of tube connections according FIG.2-4 is also possible. Weld points (15) are only added at places of the outer cage (10) with high stress at the riveted (16) points of a basically riveted outer cage (10), or rivets (16) are added only at places of the outer cage (10) with high stress at the weld points (15) by a basically welded outer cage (10).

List of reference numerals

1 pallet container

2 inner container/storage means of 1

3 filling opening

4 screw cap of 3

5 discharge valve of 2

6 bottom end of 2

7 pallet of 1

10 outer cage of 1

11 vertical tubes of 10

12 flattened end of 1 1

13 horizontal tubes of 10

14 top horizontal tube of 10

15 weld points

16 rivet of 10

17 flat head of 16

18 flattened end of 16

The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof

Claims

We claim

1. A pallet container comprising at least one pallet (7); at least one storage means (2) configured to be mounted on said pallet (7) with closable filling means (3) and emptying means (5); an outer cage assembly (10) structure securely fixed to said pallet (7) to form a support jacket and to facilitate top lifting and stacking of said pallet container (1) wherein said outer cage assembly comprises of tube structures including vertical steel tubes (11) and horizontal steel tubes (13) fastened to one another at their intersections with at least one fastening arrangement for constituting additional rigid connections at the point of intersection of tubes securing the outer frame assembly in case of failure of any one of the fastening means.

2. The pallet container as claimed in claim 1 wherein said horizontal and vertical steel tubes (13,11) are configured to be connected at points of intersection by riveting.

3. The pallet container as claimed in claim 1 wherein said horizontal and vertical steel tubes (13,11) are configured to be connected at points of intersection by riveting and welding.

4. The pallet container as claimed in claim 1 wherein said horizontal and vertical steel tubes (13,1 1) are configured to be connected at points of intersection by riveting and welding at some intersections.

5. The pallet container as claimed in claim 1 wherein said horizontal and vertical steel tubes (13,1 1) are configured to be connected at points of intersection by welding and riveting at some intersections.

6. The pallet container as claimed in claim 1 wherein said the rivets (16) are configured to be pretreated.

7. The pallet container as claimed in claim 1 wherein said horizontal and vertical tubes (13,11) are configured to be connected by riveting in line in the grid welding machine. The pallet container as claimed in claim 1 wherein said rivets (16) are configured for sustaining axial and dynamic load acting on the pallet Container (1) and keeping the steel tubes of the outer cage (10) in position.

The pallet container as claimed in claim 1 wherein said riveting of the top horizontal tube (14) with the flattened vertical tube end (12) of the lower pallet container (1) is configured to sustain the dynamic top load from the top pallet container (1) at pallet container double stacking.