CA1239111A - Link for a linked rod type conveyor - Google Patents
Link for a linked rod type conveyorInfo
- Publication number
- CA1239111A CA1239111A CA000529909A CA529909A CA1239111A CA 1239111 A CA1239111 A CA 1239111A CA 000529909 A CA000529909 A CA 000529909A CA 529909 A CA529909 A CA 529909A CA 1239111 A CA1239111 A CA 1239111A
- Authority
- CA
- Canada
- Prior art keywords
- bearing surface
- link
- rod
- loop member
- invention according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000033001 locomotion Effects 0.000 claims description 4
- 244000061456 Solanum tuberosum Species 0.000 description 9
- 235000002595 Solanum tuberosum Nutrition 0.000 description 8
- 239000002689 soil Substances 0.000 description 6
- 235000012015 potatoes Nutrition 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 241000721701 Lynx Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000029305 taxis Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/54—Endless load-carriers made of interwoven ropes or wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/02—Articles
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chain Conveyers (AREA)
Abstract
"LINK FOR A LINKED ROD TYPE CONVEYOR"
ABSTRACT OF THE DISCLOSURE
A link for a conveyor chain of the type comprising a plurality of linked rods with each rod defining a straight portion transverse to the chain and a forwardly extending loop member at each end of the straight portion at the sides of the chain. Each loop portion wraps around an edge of the straight portion of the next adjacent link. An additional portion is added to the inner side of the bight of the loop member and defines a curved bearing surface contiguous with the bearing surface defined by the bight. The side edges of the bearing surface taper so the bearing surface is reduced in angular extent as the distance from the bight increases. This allows the additional bearing portion to clear the sprocket wheel which drives the links of the chain. The additional bearing surface significantly reduces wear of the rods thus increasing life expectancy.
ABSTRACT OF THE DISCLOSURE
A link for a conveyor chain of the type comprising a plurality of linked rods with each rod defining a straight portion transverse to the chain and a forwardly extending loop member at each end of the straight portion at the sides of the chain. Each loop portion wraps around an edge of the straight portion of the next adjacent link. An additional portion is added to the inner side of the bight of the loop member and defines a curved bearing surface contiguous with the bearing surface defined by the bight. The side edges of the bearing surface taper so the bearing surface is reduced in angular extent as the distance from the bight increases. This allows the additional bearing portion to clear the sprocket wheel which drives the links of the chain. The additional bearing surface significantly reduces wear of the rods thus increasing life expectancy.
Description
"LINK FOR A LINKED ROW TYPE CONVEYOR"
BACKGROUND OF THE INVENTION
This invention relates to a link for use in a linked rod type conveyor of the type which may be used in a potato harvester or similar machine.
Generally such linked rod conveyors include a plurality of links each of which has a transverse straight portion extending fully across the width of the conveyor and defining the surface of the conveyor. A
pair of loop members are arranged at respective ends of the straight portions so as to extend forwardly therefrom to engage the next adjacent link particularly at the ends of the straight portion thereof. Thus forward motion is transmitted from one link to the next through the loop members with the forward extent of the loop members defining the spacing between each straight portion and the next adjacent straight portion.
Generally conveyors of this type wrap around rollers or sprockets at a forward and rearward end of the conveyor run so as to form a continuous chain of the links. In one example of a machine of this type, a blade engages the ground ahead of a forward roller of the con-voyeur so as to lift broken earth from the ground onto the lo top of the conveyor run so the earth is carried rearward-lye on the conveyor run while acting to separate potatoes or the like from the earth.
It will be appreciated that, as the links move around the front roller and the drive sprocket of the conveyor run, it is necessary for rotation to occur between the loop member of one link and the straight portion of the next adjacent link. This rotation occurs only over a limited angular extent of the next Addison rod and occurs only at the front and rear ends of the conveyor run; however it occurs under highly stressed and contaminated conditions. In particular the soil particles can enter into the spaces between the loop member and the rod and can thus act as a highly effective abrasive. No lubrication is of course possible in this area.
This vigorous working of the loop member on the next adjacent link thus causes rapid and highly damaging wear. In particularly harsh conditions, the rod conveyor which acts upon the ground can last only approximately one wee of operating time before it is necessary to replace the links.
Normally each link is formed solely from a rod of approximately 1/2 inch diameter which is bent to form . . .
i ; :
: ` - . .
" , ; `
I
the transverse straight portion and the forwardly extend-in loop members. One example of a device of this type is shown in United States patent no: 2,555,~92 (Hatch).
In this arrangement the inventor attempts to reduce the wear by increasing the length of contact between the loop member and the next adjacent link. This is obtained by forming a rearwardLy curved portion at the next adjacent link so that the loop member and the rearward curved portion are more closely interlined around a greater angular extent thereof. However this device has not proved satisfactory and for more than 40 years the simple rod link conveyor has been available and farmers have been obliged to put up with the unsatisfactory wear characteristics.
SUMMARY OF THE INVENTION
It is one object of the present invention, therefore, to provide an improved link for a linked rod conveyor of this general type which significantly increases the life of the links before wear causes their replacement.
According to the invention, therefore, there is provided a link for use in a linked rod conveyor comprise in a single rod bent to form a generally straight portion for extending transversely of the conveyor and a . .
, I
pair of loop members each at a respective end of the straight portion and arranged to extend forwardly there-from to engage around a next adjacent link to transmit forward movement therefrom to the link and two additional portions attached to the rod each at a respective loop member, extending to one side thereof and defining a curved bearing surface for engaging around the next adjacent link.
Preferably the additional portion attached to the link at the loop member is formed from an initially flat strip of steel which is bent to define the curved bearing surface and is welded to an inner side of the loop member to form a bearing surface contiguous there-with. Preferably the angularly spaced edges of the bear-in surface taper inwardly as the distance from the loop member increases so as to reduce the angular extent of the bearing surface as the distance increases. This enables the next adjacent rod to sit in the recesses of the sprocket wheel and to engage the teeth of the sprocket wheel without the additional portion interfering with the proper engagement. Preferably the sides of the additional portion taper from an angular extent greater than ]80 to an angular extent lets than 90.
With the foregoing in view, and other ad van-:
':
, ... .
I
taxes as will become apparent to those skilled in the art to which this invention relates as this specification proceeds, the invention is herein described by reference to the accompanying drawings forming a part hereof, which includes a description of the best mode known to the applicant and of the preferred typical embodiment of the principles of the present invention, in which:
DESCRIPTION OF THE DRAWINGS
Figure 1 is side elevation Al view of the front conveyor chain of a potato harvester omitting for convent fence of illustration the frame structure.
Figure 2 is an isometric view showing the interconnection between one link and the next adjacent link at one end of the links.
Figure 3 is a plan view of an additional portion of one of the links prior to bending to define the curved bearing surface.
Figure 4 is a plan view of the conveyor of Figure 1 showing a part only thereof adjacent the sprocket wheel.
Figure 5 is a side elevation Al view of one link showing the addition portion attached thereto.
In the drawings like characters of reference indicate corresponding parts in the different figures.
:
, :
. .
DETAILED DESCRIPTION
Referring firstly to Figure 1 there is shown the general system of a potato harvester of the type with which the present invention is particularly concerned.
Specifically there is provided a front bar 10 which is an elongate rod of the order of one inch in diameter which engages the ground and is driven forwardly into the ground by the. supporting frame structure (not shown).
Immediately rearwardly of the rod 10 is provided a guide plate 11 which carries the broken and cut soil from the rod 10 generally in an inclined upwardly direction toward the conveyor chain indicated at 12. The conveyor chain is formed from a plurality ox rod type links each of which is of the construction shown in Figures 2 through 5 and includes a straight portion 13 which extends trays-tersely across the conveyor from one side to the other and a forwardly extending loop portion 14 which wraps around the next adjacent forward link so as to transmit force from the forward link to the rearward lynx and thus throughout the whole chain.
The complete continuous chain wraps around a front roller AYE defined by two roller parts which are spaced apart so they engage effectively only the loop members leaving the central area of the conveyor defined I
. , .
' ' : ' :
~3~3~
by the straight portions 13 of the rods for grasping and carrying the soil and harvested potatoes. At a rear end of the conveyor is provided a drive sprocket AYE which includes teeth 17B and recesses 17C for engaging around the outermost ends of the straight portion as shown best in Figure 4 for generating the forward motion of the links of the chain.
In operation the soil cut and lifted by the rod is transported over the upper run of the conveyor chain so that soil breaking away from the potatoes falls through the spaces between the rods while the spacing is chosen to collect and carry potatoes of a reasonable size.
Rearwardly of the conveyor is provided a pour-amity of further conveyors which further separate soil and in addition which are arranged with larger spacing so as to carry the foliage from the potato plant away from the crop of potatoes.
Turning in more detail to the links individual-lye each link includes the straight portion 13 which monocled a slight upward inclination adjacent the outer-most end so that the central straight portion lies in a slightly lower plane than the inner end of the loop member 14.
.. '"
. .
36~
From the outermost end of the straight portion 13 adjacent the root of the loop member, the loop member includes an inwardly and forwardly extending portion I
a bight portion I which lies substantially in a vertical plane and a rearwardly, downwardly and slightly inwardly extending tail portion 17~
The construction described to this point is of a conventional nature and has operated in the manner described for at least 40 years.
The present invention provides the improvement of an additional bearing portion generally indicated at 18. The additional bearing portion is shown as a flat blank in Figure 3 indicated at 19. It will be noted that an innermost edge 20 of the portion is of a treater length than an outermost edge 21 so as to define tapering sides 22 and 23. In manufacture, the blank 19 is formed into a curve so that the inner surface thereof has a radius of curvature substantially equal to or slightly greater than the radius of curvature of the rod. This curvature it substantially equal to the curvature of the bight portion 16 so that the bight and the additional portion 18 wrap closely around the straight portion of the next adjacent link.
In Figure 4 the position of the links in - - . ,:
.. I, .
.
.. : - '' : , . . . :
: . . ' ':
engagement with a sprocket wheel AYE is shown. Generally the sprocket wheels are spaced so that they run on the links just inside the innermost extent of the additional portions 18. However in operation it it quite common for the conveyor chain to slightly wander transversely so the additional portions 18 on one side of the links overlap the adjacent sprocket wheel. In this case, as shown in Figure 4, the taper of the edges 22 and 23 is arranged Jo that the angular extent thereof at the edge 21 remote from the respective bight portion is less than 90 so that the additional portion can lie in a recess 18 of the sprocket wheel 16 effectively without engaging the sides of the teeth 17. The extent of the edge 20 of the add-tonal portion is such that when it wraps around the rod it extends over an arc slightly greater than 180~ and defines a loose fit bearing surface around therefore approximately one half of the straight portion of the next adjacent rod.
The link of the invention is therefore formed by a single rod which is bent as in the conventional type link to form the straight portion and the loop member extending forwardly therefrom and is modified by the addition of the particularly shaped additional bearing surface which extends outwardly to one side of the loop .
. .
- ] o -member.
Since various modifications can be made in my invention as hereinabove described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
. ::
- . :- :
' ' 'I .
BACKGROUND OF THE INVENTION
This invention relates to a link for use in a linked rod type conveyor of the type which may be used in a potato harvester or similar machine.
Generally such linked rod conveyors include a plurality of links each of which has a transverse straight portion extending fully across the width of the conveyor and defining the surface of the conveyor. A
pair of loop members are arranged at respective ends of the straight portions so as to extend forwardly therefrom to engage the next adjacent link particularly at the ends of the straight portion thereof. Thus forward motion is transmitted from one link to the next through the loop members with the forward extent of the loop members defining the spacing between each straight portion and the next adjacent straight portion.
Generally conveyors of this type wrap around rollers or sprockets at a forward and rearward end of the conveyor run so as to form a continuous chain of the links. In one example of a machine of this type, a blade engages the ground ahead of a forward roller of the con-voyeur so as to lift broken earth from the ground onto the lo top of the conveyor run so the earth is carried rearward-lye on the conveyor run while acting to separate potatoes or the like from the earth.
It will be appreciated that, as the links move around the front roller and the drive sprocket of the conveyor run, it is necessary for rotation to occur between the loop member of one link and the straight portion of the next adjacent link. This rotation occurs only over a limited angular extent of the next Addison rod and occurs only at the front and rear ends of the conveyor run; however it occurs under highly stressed and contaminated conditions. In particular the soil particles can enter into the spaces between the loop member and the rod and can thus act as a highly effective abrasive. No lubrication is of course possible in this area.
This vigorous working of the loop member on the next adjacent link thus causes rapid and highly damaging wear. In particularly harsh conditions, the rod conveyor which acts upon the ground can last only approximately one wee of operating time before it is necessary to replace the links.
Normally each link is formed solely from a rod of approximately 1/2 inch diameter which is bent to form . . .
i ; :
: ` - . .
" , ; `
I
the transverse straight portion and the forwardly extend-in loop members. One example of a device of this type is shown in United States patent no: 2,555,~92 (Hatch).
In this arrangement the inventor attempts to reduce the wear by increasing the length of contact between the loop member and the next adjacent link. This is obtained by forming a rearwardLy curved portion at the next adjacent link so that the loop member and the rearward curved portion are more closely interlined around a greater angular extent thereof. However this device has not proved satisfactory and for more than 40 years the simple rod link conveyor has been available and farmers have been obliged to put up with the unsatisfactory wear characteristics.
SUMMARY OF THE INVENTION
It is one object of the present invention, therefore, to provide an improved link for a linked rod conveyor of this general type which significantly increases the life of the links before wear causes their replacement.
According to the invention, therefore, there is provided a link for use in a linked rod conveyor comprise in a single rod bent to form a generally straight portion for extending transversely of the conveyor and a . .
, I
pair of loop members each at a respective end of the straight portion and arranged to extend forwardly there-from to engage around a next adjacent link to transmit forward movement therefrom to the link and two additional portions attached to the rod each at a respective loop member, extending to one side thereof and defining a curved bearing surface for engaging around the next adjacent link.
Preferably the additional portion attached to the link at the loop member is formed from an initially flat strip of steel which is bent to define the curved bearing surface and is welded to an inner side of the loop member to form a bearing surface contiguous there-with. Preferably the angularly spaced edges of the bear-in surface taper inwardly as the distance from the loop member increases so as to reduce the angular extent of the bearing surface as the distance increases. This enables the next adjacent rod to sit in the recesses of the sprocket wheel and to engage the teeth of the sprocket wheel without the additional portion interfering with the proper engagement. Preferably the sides of the additional portion taper from an angular extent greater than ]80 to an angular extent lets than 90.
With the foregoing in view, and other ad van-:
':
, ... .
I
taxes as will become apparent to those skilled in the art to which this invention relates as this specification proceeds, the invention is herein described by reference to the accompanying drawings forming a part hereof, which includes a description of the best mode known to the applicant and of the preferred typical embodiment of the principles of the present invention, in which:
DESCRIPTION OF THE DRAWINGS
Figure 1 is side elevation Al view of the front conveyor chain of a potato harvester omitting for convent fence of illustration the frame structure.
Figure 2 is an isometric view showing the interconnection between one link and the next adjacent link at one end of the links.
Figure 3 is a plan view of an additional portion of one of the links prior to bending to define the curved bearing surface.
Figure 4 is a plan view of the conveyor of Figure 1 showing a part only thereof adjacent the sprocket wheel.
Figure 5 is a side elevation Al view of one link showing the addition portion attached thereto.
In the drawings like characters of reference indicate corresponding parts in the different figures.
:
, :
. .
DETAILED DESCRIPTION
Referring firstly to Figure 1 there is shown the general system of a potato harvester of the type with which the present invention is particularly concerned.
Specifically there is provided a front bar 10 which is an elongate rod of the order of one inch in diameter which engages the ground and is driven forwardly into the ground by the. supporting frame structure (not shown).
Immediately rearwardly of the rod 10 is provided a guide plate 11 which carries the broken and cut soil from the rod 10 generally in an inclined upwardly direction toward the conveyor chain indicated at 12. The conveyor chain is formed from a plurality ox rod type links each of which is of the construction shown in Figures 2 through 5 and includes a straight portion 13 which extends trays-tersely across the conveyor from one side to the other and a forwardly extending loop portion 14 which wraps around the next adjacent forward link so as to transmit force from the forward link to the rearward lynx and thus throughout the whole chain.
The complete continuous chain wraps around a front roller AYE defined by two roller parts which are spaced apart so they engage effectively only the loop members leaving the central area of the conveyor defined I
. , .
' ' : ' :
~3~3~
by the straight portions 13 of the rods for grasping and carrying the soil and harvested potatoes. At a rear end of the conveyor is provided a drive sprocket AYE which includes teeth 17B and recesses 17C for engaging around the outermost ends of the straight portion as shown best in Figure 4 for generating the forward motion of the links of the chain.
In operation the soil cut and lifted by the rod is transported over the upper run of the conveyor chain so that soil breaking away from the potatoes falls through the spaces between the rods while the spacing is chosen to collect and carry potatoes of a reasonable size.
Rearwardly of the conveyor is provided a pour-amity of further conveyors which further separate soil and in addition which are arranged with larger spacing so as to carry the foliage from the potato plant away from the crop of potatoes.
Turning in more detail to the links individual-lye each link includes the straight portion 13 which monocled a slight upward inclination adjacent the outer-most end so that the central straight portion lies in a slightly lower plane than the inner end of the loop member 14.
.. '"
. .
36~
From the outermost end of the straight portion 13 adjacent the root of the loop member, the loop member includes an inwardly and forwardly extending portion I
a bight portion I which lies substantially in a vertical plane and a rearwardly, downwardly and slightly inwardly extending tail portion 17~
The construction described to this point is of a conventional nature and has operated in the manner described for at least 40 years.
The present invention provides the improvement of an additional bearing portion generally indicated at 18. The additional bearing portion is shown as a flat blank in Figure 3 indicated at 19. It will be noted that an innermost edge 20 of the portion is of a treater length than an outermost edge 21 so as to define tapering sides 22 and 23. In manufacture, the blank 19 is formed into a curve so that the inner surface thereof has a radius of curvature substantially equal to or slightly greater than the radius of curvature of the rod. This curvature it substantially equal to the curvature of the bight portion 16 so that the bight and the additional portion 18 wrap closely around the straight portion of the next adjacent link.
In Figure 4 the position of the links in - - . ,:
.. I, .
.
.. : - '' : , . . . :
: . . ' ':
engagement with a sprocket wheel AYE is shown. Generally the sprocket wheels are spaced so that they run on the links just inside the innermost extent of the additional portions 18. However in operation it it quite common for the conveyor chain to slightly wander transversely so the additional portions 18 on one side of the links overlap the adjacent sprocket wheel. In this case, as shown in Figure 4, the taper of the edges 22 and 23 is arranged Jo that the angular extent thereof at the edge 21 remote from the respective bight portion is less than 90 so that the additional portion can lie in a recess 18 of the sprocket wheel 16 effectively without engaging the sides of the teeth 17. The extent of the edge 20 of the add-tonal portion is such that when it wraps around the rod it extends over an arc slightly greater than 180~ and defines a loose fit bearing surface around therefore approximately one half of the straight portion of the next adjacent rod.
The link of the invention is therefore formed by a single rod which is bent as in the conventional type link to form the straight portion and the loop member extending forwardly therefrom and is modified by the addition of the particularly shaped additional bearing surface which extends outwardly to one side of the loop .
. .
- ] o -member.
Since various modifications can be made in my invention as hereinabove described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
. ::
- . :- :
' ' 'I .
Claims (3)
-
- CLAIMS:
(1) A link for use in a linked rod conveyor comprising a single rod bent to form a generally straight portion for extending transversely of the conveyor and a pair of loop members each at a respective end of the straight portion and arranged to extend forwardly there-from to engage around a next adjacent link to transmit forward movement therefrom to the link and two additional portions attached to the rod each at a respective loop member, extending to one side thereof and defining a curved bearing surface for engaging around the next adjacent link.
(2) The invention according to Claim 1 where-in the additional portions are mounted only on one side of the rod at the loop member on an inward side thereof.
(3) The invention according to Claim 1 where-in the curved bearing surface has a radius of curvature of the order of that of the next adjacent rod.
(4) The invention according to Claim 1, 2 or 3 wherein the additional portion wraps around the next adjacent link over an arc greater than 180° thereof.
(5) The invention according to Claim 1, 2 or 3 wherein the additional portion is arranged substantial-ly symmetrically relative to a plane passing through the straight portion of the link and the straight p rtion of the next adjacent link.
(6) The invention according to Claim 1, 2 or 3 wherein the additional portion includes sides of the bearing surface spaced angularly of an axis of rotation of the bearing surface, said sides tapering towards each other as the distance from the loop member increases so as to reduce the angular extent of the bearing surface as its distance from the loop member increases.
(7) The invention according to Claim 1, 2 or 3 wherein the additional portion is formed from an initially planar strip of flat sheet material which is bent to form said curvature and is welded to a side of said rod.
(8) The invention according to Claim 1, 2 or - 3 wherein the additional portion includes sides of the bearing surface spaced angularly of an axis of rotation of the bearing surface, said sides tapering towards each other as the distance from the loop member increases so as to reduce the angular extent of the bearing surface as its distance from the loop member increases, and wherein the additional portion is formed from an initially planar strip of flat sheet material which is bent to form said curvature and is welded to a side of said rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000529909A CA1239111A (en) | 1987-02-17 | 1987-02-17 | Link for a linked rod type conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000529909A CA1239111A (en) | 1987-02-17 | 1987-02-17 | Link for a linked rod type conveyor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1239111A true CA1239111A (en) | 1988-07-12 |
Family
ID=4134990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000529909A Expired CA1239111A (en) | 1987-02-17 | 1987-02-17 | Link for a linked rod type conveyor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1239111A (en) |
-
1987
- 1987-02-17 CA CA000529909A patent/CA1239111A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |