ZA201006898B - A covnveyor roller - Google Patents
A covnveyor roller Download PDFInfo
- Publication number
- ZA201006898B ZA201006898B ZA2010/06898A ZA201006898A ZA201006898B ZA 201006898 B ZA201006898 B ZA 201006898B ZA 2010/06898 A ZA2010/06898 A ZA 2010/06898A ZA 201006898 A ZA201006898 A ZA 201006898A ZA 201006898 B ZA201006898 B ZA 201006898B
- Authority
- ZA
- South Africa
- Prior art keywords
- roller shell
- formation
- roller
- locking
- engagement
- Prior art date
Links
- 230000015572 biosynthetic process Effects 0.000 claims description 150
- 238000005755 formation reaction Methods 0.000 claims description 150
- 230000005484 gravity Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Rollers For Roller Conveyors For Transfer (AREA)
Description
A CONVEYOR ROLLER
This invention relates to a conveyor roller. More particularly, the invention relates to a conveyor roller which can be locked against rotation in a reverse direction.
According to the invention there is provided a conveyor roller for supporting a conveyor belt, which includes: a hollow cylindrical roller shell on which the conveyor belt is supported; i a pair of roller shell support members which are each disposed at a different end of the roller shell and secured thereto for rotation therewith; a pair of central fixed mounting members at opposite ends of the roller shell which are each associated with a different one of the roller shell support members and which include mounting means for mounting the central fixed mounting members to fixed supports whereby the central fixed mounting members are held stationary during rotation of the roller shell, bearing means between each central fixed mounting member and its associated roller shell support member, which permit rotation of the roller shell support members relative to their associated central fixed mounting members; a central shaft which defines a longitudinal axis and which is secured at opposite ends thereof to the central fixed mounting members; at least one engagement formation fixed relative to the central shaft such that the engagement formation is held stationary during rotation of the roller shell; and at least one locking formation which is pivotally mounted to a particular one of the roller shell support members and the roller shell in an arrangement wherein the locking formation is pivotable about a pivot axis which is radially spaced from the longitudinal axis of the central shaft in an arrangement in which the locking formation revolves around the central shaft as the roller shell support member rotates, in use,
and wherein the locking formation can be brought into contact with the engagement formation, the locking formation being configured to permit rotation of the roller shell support member associated therewith when the roller shell support member rotates in a ; forwards direction and to engage the engagement formation when the roller shell : support member rotates in a rearwards direction, the locking formation being pivotally mounted to the roller shells support member in an arrangement wherein it is displaceable between a locking condition wherein the locking formation contacts and engages the engagement formation when the roller shell support member rotates in said rearwards direction, so as to lock the roller shell support member against further rearwards rotation relative to the central shaft thereby to brake displacement of the conveyor belt and a release condition wherein the locking formation disengages the engagement formation when the roller shell support member rotates in said forward direction.
In a particular embodiment the central shaft may define said engagement formation.
More particularly, the central shaft may define a number of said engagement formations, the central shaft having a polygonal cross-sectional profile having edges which each define a particular one of said engagement formations. As such, the central shaft may be square in cross-section having four corners which each define one of said engagement formations.
In another embodiment, the conveyor roller may include at least one ratchet-wheel which defines at least one of said engagement formations in the form of a ratchet formation along an outer circumference thereof. Said ratchet-wheel may define a plurality of ratchet formations which each define a particular one of said engagement formations. Said ratchet-wheel may be mounted to one of the central shaft and a particular one of the central fixed mounting members of the pair of central fixed mounting members.
The conveyor roller may include a pair of said ratchet-wheels, each ratchet-wheel being mounted to a different one of the central fixed mounting members of said pair of central fixed mounting members and wherein a number of the locking formations are mounted to each of the roller shell support members associated therewith.
The conveyor roller may have more than one of said locking formations which can each be brought into contact with a particular one of said engagement formations. A number of the locking formations may be mounted to each of the roller shell support members for engagement with a particular one of said engagement formations.
The or each locking formation may be configured and may have a predetermined weight so as to be displaced into contact with said engagement formation under the influence of gravity when the locking formation is disposed relatively above the central shaft and
A 5 displaced away from said engagement formation under the .influence of centrifugal : forces acting on the locking formation against gravitational forces acting on the locking formation when the conveyor roller shell rotates at a predetermined speed.
Further features of the invention are described hereinafter by way of a non-limiting example of the invention, with reference to and as illustrated in the accompanying diagrammatic drawings. In the drawings:
Figure 1 shows a side view of a first embodiment of a conveyor roller in accordance with the invention;
Figure 2 shows a sectional side view of the conveyor roller of Figure 1, sectioned along section lines Il-ll of Figure 1;
Figure 3 shows an enlarged fragmentary sectional side view of the conveyor roller of
Figure 2;
Figure 4 shows a sectional end view of the conveyor roller of Figure 1, sectioned along section lines IV- IV of Figure 1;
Figure 5 shows a side view of a second embodiment of a conveyor roller in accordance with the invention;
Figure 6 shows a perspective view of a roller shell support member of the conveyor roller of Figure 5;
Figure 7 shows an enlarged fragmentary sectional side view of the conveyor roller of
Figure 5 sectioned along section lines VII-Vil of Figure 5; and
Figure 8 shows a sectional end view of a conveyor roller of Figure 5, sectioned along section lines VIiI- Vill of Figure 5.
With reference to Figures 1 to 4 of the drawings, a first embodiment of a conveyor roller in accordance with the invention, is designated generally by the reference numeral 10.
The conveyor roller 10 is characterized in that it is adapted to be locked against rotation in a reverse direction.
The conveyor roller 10 comprises, broadly, a hollow cylindrical roller shell 14, a pair of roller shell support members 16, a pair of central fixed mounting members 18, bearing means in the form of bearings 20 and a central shaft 22 which defines four engagement 16 formations 46.
The hollow cylindrical roller shell 14 supports a conveyor belt and has opposite open ends.
The roller shell support members 16 are each located at a different end of the roller shell and secured thereto for rotation therewith. Each roller shell support member 16 has a generally annular configuration defining a central aperture and includes a cylindrical support formation 28, a retaining lip 30, and eight radially-extending webs 32. The support formations 28 of the roller shell support members 16 are configured and dimensioned to be press-fitted into the open ends of the roller shell 14. The support formation 28 of each roller shell support member 16 is thus inserted into an opposite open end of the roller shell 14 until it abuts the retaining lip 30 thereby to secure each roller shell support member 16 to the roller shell 14. The supporting webs 32 include connecting formations 34 at inner regions thereof.
Each central fixed mounting member 18 has a solid, generally cylindrical configuration and is located at a different one of the ends of the roller shell 14 within the central aperture defined by the roller shell support member 16 associated therewith. Each mounting member 18 includes mounting means in the form of a mounting formation 36 at an outer end thereof, a connecting formation 38 at an inner end thereof and a radially- extending retaining lip 40. The mounting formations 36 of the central fixed mounting members 18 are mounted, in use, to fixed supports whereby the central fixed mounting members 18 are held stationary during rotation of the roller shell as will become evident hereinafter.
Each bearing 20 is located between each roller shell support member 16 and the mounting member 18 associated therewith. Each bearing 20 includes an inner race 42 and an outer race 44 with the relevant roller shell support member 16 being mounted to the outer race 44 of the bearing 20 and the mounting member 18 being mounted to the inner race 42 in a configuration permitting rotation of the roller shell support member 16 relative to its associated central fixed mounting member 18.
The central shaft 22 has a hollow construction defining a longitudinal axis 48 extending between opposite open ends thereof. The central shaft 22 has a square cross-sectional profile having four corners which each define one of the engagement formations 46.
The central shaft 22 is mounted between the central fixed mounting members 18 by press-fitting the connecting formation 38 of each central fixed mounting member 18 into an opposite open end of the central shaft 22. As such, the central shaft 22 and the engagement formations 46 are held stationary by the central fixed mounting members 18, during rotation of the roller shell.
The conveyor roller 10 includes two annular dust covers 52 each having a central aperture which is press fitted onto a different one of the central fixed mounting members 18 thereby to protect the bearings 20 against the ingress of particulate material.
The conveyor roller 10 includes four locking formations 24 pivotally mounted to inner sides of each roller shell support member 16. Each locking formation 24 has a stop i 8 formation 25 defined on a rear sides thereof. Each locking formation 24 is pivotally mounted to the roller shell support member associated therewith by means of a pivot pin 50 received in a corresponding one of the connecting formations 34. More particularly, each locking formation 24 is mounted so as to pivot about a pivot axis 54 which is radially spaced from the longitudinal axis 48 of the central fixed shaft 22. The stop formation 25 of each locking formation 24 is configured and positioned to limit the rotation of each locking formation 24. More particularly, the stop formation 25 of each locking formation 24 abuts against the radially-extending web 32 to which the locking formation 24 is pivotally mounted, when the locking formation 24 is rotated, thereby to permit the locking formation 24 to pivot about its pivot axis 54 through an angle of approximately ninety degrees as indicated by arrow “c” of Figure 4. The locking formations 24 are circumferentially equi-spaced and revolve around the central fixed shaft 22 as the roller shell support member 16 rotates, in use.
More particularly, each locking formation 24 is configured to permit rotation of the roller shell support member 16 associated therewith when the roller shell support member 16 rotates in a forwards direction as indicated by arrow “f” of Figure 4, and to engage a particular one of the engagement formations 46 of the central shaft 22 when the roller shell support member 16 rotates in a rearwards direction as indicated by the arrow “b” of Figure 4.
The locking formations 24 are mounted to the roller shell support members 16 in an arrangement wherein they are each pivotally displaceable between a locking condition and a release condition. In the locking condition, the locking formation 24 contacts and engages the engagement formation 46 of the central shaft 22 when the roller shell support member 16 rotates in said rearwards direction, thereby locking the roller shell support member 16 against further rearward rotation and braking displacement of the conveyor belt supported on the roller shell 14. In the release condition, the locking formation 24 disengages the engagement formation 46 when the roller shell support member 16 rotates in said forward direction as indicated by arrow “f" of Figure 4.
Each locking formation 24 is configured and has a predetermined weight so as to be displaced into contact with the central shaft 22 under the influence of gravity when the locking formation 24 is disposed relatively above the central shaft 22 and to be displaced away from the central shaft 22 under the influence of centrifugal forces acting on the locking formation 24 against gravitational forces acting on the locking formation 24 when the roller shell support member 16 to which the locking formation 24 is mounted, rotates at a predetermined operational speed of the conveyor roller.
More particularly, with reference to Figure 4, the positions of the locking formations 24 during forward rotation of the roller shell support members 16 at the operational rotational speed of the conveyor roller, are indicated in broken lines by the references “r’ and the positions of the locking formations 24 when the conveyor roller shell slows down to speeds below the operational speed or stops rotating are shown in solid lines by the references “s”. In the event of the conveyor roller shell commencing rotation in a reverse direction, as indicated by arrow “b”, the locking formation 24 disposed relatively above the central shaft 22 will be displaced into contact with the central shaft 22 under the influence of gravity, thereby engaging the relevant engagement formation 46 of the central shaft 22 and braking further rotation of the conveyor roller shell in the reverse direction.
It will be appreciated that each locking formation 24 is configured and has a predetermined weight such that it is flung outwardly by centrifugal forces such that, at least at the operational speed of the conveyor roller shell, the locking formations do not make contact with the central shaft 22 thereby causing no wear and tear in the process.
With reference to Figures 5 to 8 of the drawings, a second embodiment cof a conveyor roller, in accordance with the invention, is designated generally by the reference numeral 110. The conveyor roller 110 is similar to the conveyor roller 10. In Figures 5 to 8 of the drawings, those features of conveyor roller 110 which are the same as and/or similar to the features of conveyor roller 10, shown in Figures 1 to 4, are designated by the same and/or similar reference numerals. As is the case with conveyor roller 10, the conveyor roller 110 is adapted to be locked against rotation in a reverse direction.
The conveyor roller 110 comprises, broadly, a hollow cylindrical roller shell 14, a pair of roller shell support members 116, a pair of central fixed mounting members 18, bearing means in the form of bearings 20, a central shaft 122 and a pair of ratchet-wheels 145 which define engagement formations 146 as will be described in more detail below.
The roller shell support members 116 are similar to roller shell support members 16.
What is stated above in relation to roller shell support members 16 applies equally to roller shell support members 116. However, each roller shell support member 116 has four radially-extending webs 132 and four connecting formations 134 which have different configurations to the webs 32 and connecting formations 34 of roller shell support members 16 of conveyor roller 10. More particularly, each roller shell support member 116 has four equi-spaced webs, with each connecting formation 134 being disposed between adjacent webs 132 as shown in Figures 6 and 8 of the drawings.
The central shaft 122 has a square cross-sectional profile and a hollow construction defining a longitudinal axis 148 extending between opposite open ends thereof. The central shaft 122 differs from central shaft 22 of conveyor roller 10, as the central shaft 122 does not have engagement formations associated therewith.
Each ratchet-wheel 145 has an annular configuration having a central square aperture and defining a plurality of ratchet formations along an outer circumference thereof which each define a particular one of the engagement formations 146. Each ratchet-wheel 145 is mounted to a different one of the central fixed mounting members 18. More particularly, each ratchet-whee! 145 is press fitted onto the connecting formation 38 of a different one of the central fixed mounting members 18, such that the connecting formation 38 is received within the central aperture of the ratchet-wheel 145. As such, each ratchet-wheel 145 is mounted at a position adjacent a different opposite end of the central shaft 122, as shown in Figures 7 and 8 of the drawings.
i 11
The conveyor roller 110 includes two annular dust covers 52 and four locking formations 124 pivotally mounted to inner sides of each roller shell support member 116. Each locking formation 124 is of a light weight plastics or polymeric material such as, for example, nylon. Each locking formation 124 is pivotally mounted to a different one of the connecting formations 134 by means of a pivot pin 150. Each locking formation 124 is thus able to pivot freely about a pivot axis 154 which is radially spaced from the longitudinal axis 148 of the central shaft 122. The locking formations 124 are thus circumferentially equi-spaced and revolve around the central shaft 122 as the roller shell support member 116 rotates, in use.
More particularly, each locking formation 124 is configured to permit rotation of the roller shell support member 116 associated therewith when the roller shell support member 116 rotates in a forwards direction as indicated by arrow “f” of Figure 8, and to engage a particular one of the engagement formations 146 when the roller shell support member 116 rotates in a rearwards direction as indicated by the arrow “b” of Figure 8.
The locking formations 124 are mounted to the roller shell support members 116 in an arrangement wherein they are each pivotally displaceable between a locking condition and a release condition. In the locking condition, the locking formation 124 contacts and engages the engagement formation 146 when the roller shell support member 116 rotates in said rearwards direction, thereby locking the roller shell support member 116 against further rearward rotation relative to the central shaft 122 and braking displacement of the conveyor belt supported on the roller shell 14. In the release condition, the locking formation 124 disengages the engagement formation 146 when the roller shell support member 116 rotates in said forward direction as indicated by arrow “f” of Figure 8.
Each locking formation 124 is configured and has a predetermined weight so as to be displaced into contact with the engagement formations 146 under the influence of gravity when the locking formation 124 is disposed relatively above the central shaft 122 and to be displaced away from the engagement formations 146 under the influence of
” centrifugal forces acting on the locking formation 124 against gravitational forces acting on the locking formation 124 when the roller shell support member 116 to which the locking formation 124 is mounted, rotates at a predetermined operational speed of the conveyor roller.
More particularly, with reference to Figure 8, the positions of the locking formations 124 during forward rotation of the roller shell support members 116 at the operational rotational speed of the conveyor roller, are indicated in broken lines by the references “h” and the positions of the locking formations 124 when the conveyor roller shell slows down to speeds below the operational speed or stops rotating are shown in solid lines by the references “i". In the event of the conveyor roller shell commencing rotation in a reverse direction, as indicated by arrow “b”, the locking formation 124 disposed relatively above the central shaft 122 will be displaced into contact with the engagement formations 146 under the influence of gravity, thereby braking further rotation of the conveyor roller shell in the reverse direction.
It will be appreciated that each locking formation 124 is configured and has a : predetermined weight such that it is flung outwardly by centrifugal forces such that, at least at the operational speed of the conveyor roller shell, the locking formations do not make contact with the engagement formations 146 thereby causing no wear and tear in the process. it will be appreciated that the exact configuration of the conveyor roller 10,110, in accordance with the invention, may vary greatly, while still incorporating the essential features of the invention as described hereinabove. For example, in an alternative embodiment, instead of mounting the ratchet-wheel to the central fixed mounting member, as described hereinabove, the ratchet-wheel can, alternatively, be mounted to the central shaft (not shown). Similarly, it will be appreciated that in another embodiment, instead of mounting the locking formations to the roller shell support members, as described hereinabove, the locking formations can, alternatively, be pivotally mounted to the roller shell (not shown). Similarly, it will be appreciated that the number of locking formations, and the number of engagement formations, are greatly variable.
The invention clearly extends to all such variations, which still incorporate the essential principles of the invention as above described and defined. { i { t
Claims (12)
1. A conveyor roller for supporting a conveyor belt, which includes: Co ! a hollow cylindrical roller shell on which the conveyor belt is supported; a pair of roller shell support members which are each disposed at a different end of the roller shell and secured thereto for rotation therewith; a pair of central fixed mounting members at opposite ends of the roller shell which are each associated with a different one of the roller shell support members and which include mounting means for mounting the central fixed mounting members to fixed supports whereby the central fixed mounting members are held stationary during rotation of the roller shell; bearing means between each central fixed mounting member and its associated roller shell support member, which permit rotation of the roller shell support members relative to their associated central fixed mounting members; a central shaft which defines a longitudinal axis and which is secured at opposite ends thereof to the central fixed mounting members; at least one engagement formation fixed relative to the central shaft such that the engagement formation is held stationary during rotation of the roller shell; and at least one locking formation which is pivotally mounted to a particular one of the roller shell support members and the roller shell in an arrangement wherein the locking formation is pivotable about a pivot axis which is radially spaced from the longitudinal axis of the central shaft in an arrangement in which the locking formation revolves around the central shaft as the roller shell support member rotates, in use, and wherein the locking formation can be brought into contact with the engagement formation, the locking formation being configured to permit rotation of the roller shell support member associated therewith when the roller shell support member rotates in a forwards direction and to engage the engagement formation when the roller shell support member rotates in a rearwards direction, the locking formation being pivotally mounted to the roller shells support member in an arrangement wherein it is displaceable between a locking condition wherein the locking formation contacts and engages the engagement formation when the roller shell support member rotates in said rearwards direction, so as to lock the roller shell support member against further rearwards rotation relative to the central shaft thereby to brake displacement of the conveyor belt and a release condition wherein the locking formation disengages the engagement formation when the roller shell support member rotates in said forward direction.
2. The conveyor roller as claimed in Claim 1, wherein the central shaft defines said engagement formation.
3. The conveyor roller as claimed in Claim 2, wherein the central shaft defines a number of said engagement formations, the central shaft having a polygonal cross-sectional profile having edges which each define a particular one of said engagement formations.
4. The conveyor roller as claimed in Claim 3, wherein the central shaft is square in cross-section having four corners which each define one of said engagement formations.
5. The conveyor roller as claimed in Claim 1, which includes at least one ratchet- wheel which defines at least one of said engagement formations in the form of a ratchet formation along an outer circumference thereof.
6. The conveyor roller as claimed in Claim 5, wherein said ratchet-wheel defines a plurality of ratchet formations which each define a particular one of said engagement formations.
7. The conveyor roller as claimed in Claim 5 or Claim 6, wherein said ratchet-wheel is mounted to one of the central shaft and a particular one of the central fixed mounting members of the pair of central fixed mounting members.
8. The conveyor roller as claimed in Claim 7, which includes a pair of said ratchet- wheels, each ratchet-wheel being mounted to a different one of the central fixed mounting members of said pair of central fixed mounting members and wherein a number of the locking formations are mounted to each of the roller shell support members associated therewith.
9. The conveyor roller as claimed in any one of Claims 1 to 8, wherein the conveyor roller has more than one of said locking formations which can each be brought into contact with a particular one of said engagement formations.
10. The conveyor roller as claimed in Ciaim 9, wherein a number of the locking formations are mounted to each of the roller shell support members for engagement with a particular one of said engagement formations.
11. The conveyor roller as claimed in any one of Claims 1 to 10, wherein the or each locking formation is configured and has a predetermined weight so as to be displaced into contact with said engagement formation under the influence of gravity when the locking formation is disposed relatively above the central shaft and displaced away from said engagement formation under the influence of centrifugal forces acting on the locking formation against gravitational forces acting on the locking formation when the conveyor roller shell rotates at a predetermined speed.
12. The conveyor roller as claimed in Claim 1, substantially as described in the specification with reference to and as illustrated in any of the drawings.
DATED THIS 27™ DAY OF SEPTEMBER 2010 0,
ADAMS & ADAMS
APPLICANT'S PATENT ATTORNEYS
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200907616 | 2009-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA201006898B true ZA201006898B (en) | 2011-06-29 |
Family
ID=61026633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA2010/06898A ZA201006898B (en) | 2009-10-29 | 2010-09-28 | A covnveyor roller |
Country Status (1)
| Country | Link |
|---|---|
| ZA (1) | ZA201006898B (en) |
-
2010
- 2010-09-28 ZA ZA2010/06898A patent/ZA201006898B/en unknown
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