GB2429907A - Wheel assembly for oven rack - Google Patents
Wheel assembly for oven rack Download PDFInfo
- Publication number
- GB2429907A GB2429907A GB0518201A GB0518201A GB2429907A GB 2429907 A GB2429907 A GB 2429907A GB 0518201 A GB0518201 A GB 0518201A GB 0518201 A GB0518201 A GB 0518201A GB 2429907 A GB2429907 A GB 2429907A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wheel
- wheel assembly
- axle
- sleeve
- porous
- 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.)
- Withdrawn
Links
- 239000000314 lubricant Substances 0.000 claims abstract description 18
- 125000006850 spacer group Chemical group 0.000 claims abstract description 15
- 239000011148 porous material Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 235000013305 food Nutrition 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 208000025940 Back injury Diseases 0.000 description 1
- 208000011092 Hand injury Diseases 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004446 fluoropolymer coating Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/16—Shelves, racks or trays inside ovens; Supports therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/0028—Construction of wheels; methods of assembling on axle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Transmission Devices (AREA)
Abstract
A wheel assembly 10 comprising a wheel 1 with an axle mounting bore 15 extending along its axis of rotation. The assembly further comprises an elongate axle 9 extending through and beyond the axle mounting bore, a sleeve 7 extending through and beyond the axle mounting bore which axially restrainedly ensleeves an intermediate part of the axle and one or more annular porous bushes 8 mounted substantially within the axle mounting bore intimately between the wheel and the sleeve wherein the or each porous bushes incorporates a lubricant reservoir. The annular porous bushes can be spaced apart by a tubular spacer 2. A U-shaped mounting element 3 can be positioned astride the wheel. The wheel assembly can be used for an oven rack and the porous bushes can incorporate an array of substantially radial pores (22) containing carbon lubricant (16).
Description
DEVICE
The present invention is directed to a wheel assembly for use on oven racks and to an oven rack per Se.
Wheeled, free standing oven racks are used in the food industry and other * industries in which large volume industrial ovens (commonly known as rack ovens) are used. In the food industry, the oven racks are used to transport food products cooked in the ovens. The oven racks are often mounted on swivelling wheel assemblies to aid * manoeuvrability. The oven racks are subjected to extreme conditions. For example, the oven racks are often moved directly from an oven at an elevated temperature of up to *::: 300 C to a chiller cabinet at a low temperature of 0 C to -40 C. These temperature: . : : differences cause high thermal stresses in the oven rack. Furthermore, the oven racks are often cleaned in a brine solution which promotes corrosion of metallic parts. Conventional wheel assemblies operating with plastic or metal bushes are prone to seizure due to failure of the wheel bearings. Seizure in the wheel bearings leads to intolerable levels of noise and a risk of hand or back injuries, together with a general lack of control during manouevre.
The present invention exploits a novel wheel bearing arrangement to substantially eliminate certain drawbacks in conventional wheel assemblies.
Viewed from one aspect the present invention provides a wheel assembly comprising (a) a wheel with an axle mounting bore extending along its axis of rotation; (b) an elongate axle extending through and beyond the axle mounting bore; (c) a sleeve extending through and beyond the axle mounting bore which axially restrainedly ensleeves an intermediate part of the axle; and (d) one or more annular porous bushes mounted substantially within the axle mounting bore intimately between the wheel and the sleeve, wherein the or each porous bush incorporates a lubricant reservoir.
The wheel assembly of the present invention advantageously has a reduced tendency to seizure without the need for repeated extraneous lubrication. This makes an oven rack containing the wheel assembly easier to manoeuvre and control, whilst substantially eliminating noisy squeaking.
Preferably the one or more annular porous bushes are two or more aimular porous bushes mounted substantially within the axle mounting bore intimately between the wheel s: *:* and the sleeve, wherein each porous bush incorporates a lubricant reservoir. S..
In a preferred embodiment the one or more annular porous bushes are two annular: * : ..
porous bushes mounted substantially within the axle mounting bore intimately between the wheel and the sleeve, wherein each porous bush incorporates a lubricant reservoir. : :: Typically the or each porous bush protrudes from the end of the axle mounting bore (usually by a small amount). Two porous bushes are generally mounted at opposing ends of the axle mounting bore and may protrude from each end of the axle mounting bore (usually by a small amount). Preferably the or each bush falls short of the end of the sleeve.
The lubricant reservoir is typically contained in at least one pore (preferably all of the pores) of the porous bush. Preferably the porous bush incorporates an array of substantially radial pores. The pores may be open-ended or closed-ended (eg a pocket). The lubricant may be a carbon-based lubricant.
The or each porous bush may be fixedly or freely mounted within the axle mounting bore. Preferably the or each porous bush is fixed to the wheel or the sleeve.
Particularly preferably the or each porous bush is fixed to the wheel.
Preferably the wheel assembly further comprises at least one spacer for axially spacing apart the annular porous bushes. Particularly preferably the at least one spacer is a single spacer. The spacer advantageously minimises the size of bushes required and therefore minimises the cost of the wheel assembly.
The spacer is typically cylindrical (eg tubular). The spacer may be intimately mounted on the wheel within the axle mounting bore. The internal diameter of the spacer is conveniently greater than the internal diameter of the or each porous bush.
In a preferred embodiment the wheel assembly further comprises: a Ushaped mounting element positioned astride the wheel so as to axially restrain the sleeve. Particularly preferably the U-shaped mounting element comprises: * : *: a pair of elongate legs positioned astride the wheel, wherein each elongate leg has an axle mounting aperture coincident with the axle mounting bore, wherein the axle passes through and beyond each axle mounting aperture and is fastened laterally to the U-shaped * : ::* mounting element. * . **** * 0** * * * The U-shaped mounting element may be adapted to mount the wheel assembly to the oven rack. For example, the U-shaped mounting element may be adapted to mount the wheel assembly to the oven rack in a rotary fashion (eg to allow independent swivel of the wheel assembly). The U-shaped mounting element may be a bracket or a clevis.
The axle may be a fastener such as a bolt. The bolt may have a hexagonal head.
The bolt may be partially threaded. The bolt may be fastened laterally to the U-shaped mounting element (eg bracket) through the engagement of a threaded part of the bolt with a threaded nut. Spacers and/or wqashers may be used to facilitate fastening.
Preferably the wheel assembly is an oven rack wheel assembly.
Typically the sleeve is a stub shaft.
Preferably the sleeve is coated with a coating. The coating may be adapted to operate in a lubricated environment or a non-lubricated environment. The coating may be self-lubricating. The coating may be metallic. The coating may be a layer of passivated zinc. Alternatively, the sleeve coating may be composed of a polymeric material. The sleeve coating may be a fluoro-polymer coating such as PTFE. The coating may be corrosion resistant to further reduce any tendency to seizure.
The wheel may adopt any conventional form. For example, the wheel may be phenolic or cast metal.
The sleeve may be machined so that its external diameter fits within a tightly defined tolerance. The sleeve coating may he applied to a desired thickness within a tightly defined tolerance. The sleeve and sleeve coating may be correctly toleranced to fit the. . annular bushes. Typically the contact surface between the bushes and the sleeve coating is * : a dynamic running surface.
The bushes, sleeve and sleeve coating may be composed of a material with similar: thermal expansion properties. This may enhance the resistance to seizure of the wheel by reducing the effect of changes in the operating temperature of the wheel.
The wheel assembly may further comprise a lubricant port extending from the exterior of the wheel assembly to the axle mounting bore. The port may be used to add extraneous lubricant. A nut may be provided to seal the lubrication port and prevent lubricant from exiting the wheel assembly during use where it might otherwise contaminant food in the oven.
In a preferred embodiment, the wheel assembly is substantially free of extraneous lubricant.
Viewed from a further aspect an oven rack comprising at least one wheel assembly as defined hereinbefore.
The present invention will now be described by way of example with reference to the accompanying figures in which: Figure 1 is a side elevation of a wheel assembly in accordance with an embodiment of the invention; Figure 2 is a cross-section along section line AA of figure 1; Figure 3 is an illustration of an oven rack in accordance with an embodiment of the invention; and Figure 4 is a detailed perspective view of the annular bush of an embodiment of the invention.
Figures 1 and 2 show a side elevation and a cross-sectional view respectively of a wheel assembly (10) for an oven rack in accordance with an embodiment of the invention.
The wheel assembly (10) comprises a wheel (1) with a prominent wheel hub (21) fixed to:* the rack (not shown) by a substantially U-shaped wheel clevis (3). The wheel hub (21) * ** defines an axle mounting bore (15) along the axis of rotation of the wheel (1).
The wheel clevis (3) comprises a pair of substantially parallel elongate legs (14) positioned astride the wheel (1). Each elongate leg (14) has an axle mounting aperture (13) and the axle mounting apertures (13) are coincident respectively with opposite ends of the axle mounting bore (15). A bolt (9) extending through and beyond the axle mounting bore (15) acts as an axle which passes through the axle mounting apertures (13) and is fastened laterally to the clevis (3) at a threaded end by a threaded nut (6), a plain washer (4) and a spring washer (5).
The wheel assembly (10) further comprises a sleeve (7) which ensleeves the intermediate portion of the bolt (9) within and just beyond the axle mounting bore (15) and is coated on its outer surface (19) with a layer of passivated zinc. The sleeve (7) is restrained axially at a position within and just beyond the axle mounting bore (15) by the elongate legs (14) of the wheel clevis (3).
Each of two annular porous bushes (8) is attached to the wheel hub (21) by pressing and gluing. A tubular spacer (2) retains the annular porous bushes (8) in axial spaced apart relationship at opposite ends of the axle mounting bore (15). The outer diameter of the spacer (2) is the same as the outer diameter of the porous bushes (8) while the inner diameter of the spacer (2) is larger than the inner diameter of the porous bushes (8). Figure 4 shows a detailed isolated view of the annular porous bush (8) and the sleeve (7). Extending radially through the porous bush (8) from the outer peripheral surface (29) to the inner peripheral surface (18) are a number of radial bores (22). The radial bores (22) contain a carbon-based lubricant (16). Each porous bush (8) is sized so that its inner peripheral surface (18) fits intimately on the outer surface (19) of the sleeve (7). This intimate contact constitutes the dynamic running surface. When in use the wheel (1) is rotated relative to the sleeve (7), the inner peripheral surface (18) of each porous bush (8) rotates relative to the outer surface (19) of the sleeve (7).
The wheel assembly (10) further comprises a lubrication port (12) which may be used to add lubricant from an external source. A lubrication nut (11) releasably seals the * : lubrication port (12) and prevents lubricant (16) from escaping from the wheel (1) when in use to eliminate any risk of food contamination. : Figure 3 shows examples of oven racks (20) which are mounted on four wheel assemblies (10).
Claims (14)
1. A wheel assembly comprising (a) a wheel with an axle mounting bore extending along its axis of rotation; (b) an elongate axle extending through and beyond the axle mounting bore; (c) a sleeve extending through and beyond the axle mounting bore which * s.. 5I*I
axially restrainedly ensleeves an intermediate part of the axle; and (d) one or more annular porous bushes mounted substantially within the axle mounting bore intimately between the wheel and the sleeve, wherein the or each porous bush incorporates a lubricant reservoir. :, :
2. A wheel assembly as claimed in claim I wherein the one or more annular porous bushes are two or more annular porous bushes mounted substantially within the axle *: :: mounting bore intimately between the wheel and the sleeve, wherein each porous bush incorporates a lubricant reservoir.
3. A wheel assembly as claimed in claim 1 or 2 wherein the one or more annular porous bushes are two annular porous bushes mounted substantially within the axle mounting bore intimately between the wheel and the sleeve, wherein each porous bush incorporates a lubricant reservoir.
4. A wheel assembly as claimed in claim 2 or 3 further comprising at least one spacer for axially spacing apart the annular porous bushes.
5. A wheel assembly as claimed in claim 4 wherein the at least one spacer is a single spacer.
6. A wheel assembly as claimed in any preceding claim wherein the or each porous bush is fixed to the wheel or the sleeve.
7. A wheel assembly as claimed in claim 6 wherein the or each porous bush is fixed to the wheel.
8. A wheel assembly as claimed in any preceding claim further comprising: a U-shaped mounting element positioned astride the wheel so as to axially restrain the sleeve.
9. A wheel assembly as claimed in claim 8 wherein the U-shaped mounting element comprises: a pair of elongate legs positioned astride the wheel, wherein each elongate leg has an axle mounting aperture coincident with the axle mounting bore, wherein the axle passes through and beyond each axle mounting aperture and is fastened laterally to the U-shaped mounting element.
10. A wheel assembly as claimed in any preceding claim being an oven rack wheel assembly.
11. A wheel assembly as claimed in any preceding claim wherein the porous bush: incorporates an array of substantially radial pores.
12. An oven rack comprising at least one wheel assembly as claimed in any preceding: claim. ::::.
13. A wheel assembly substantially as hereinbefore defined with reference to the S...
accompanying drawings. *
14. A rack substantially as hereinbefore defined with reference to the accompanying *.* drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0518201A GB2429907A (en) | 2005-09-07 | 2005-09-07 | Wheel assembly for oven rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0518201A GB2429907A (en) | 2005-09-07 | 2005-09-07 | Wheel assembly for oven rack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0518201D0 GB0518201D0 (en) | 2005-10-19 |
| GB2429907A true GB2429907A (en) | 2007-03-14 |
Family
ID=35221008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0518201A Withdrawn GB2429907A (en) | 2005-09-07 | 2005-09-07 | Wheel assembly for oven rack |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2429907A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725093A (en) * | 2018-05-22 | 2018-11-02 | 平湖市义合箱包有限公司 | A kind of universal wheel of automatic plus lubricating oil for luggage |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882617A (en) * | 1960-03-23 | 1961-11-15 | Thomas Ltd Martin | Improvements in or relating to castors |
| US3283358A (en) * | 1964-09-16 | 1966-11-08 | Richard S Merriam | Heavy duty caster |
| US3318432A (en) * | 1965-09-22 | 1967-05-09 | Westinghouse Electric Corp | Wheeled transportation assemblies |
| GB1376148A (en) * | 1972-12-11 | 1974-12-04 | Flexello Castors Wheels Ltd | Wheel mounting and braking assembly |
| GB2183468A (en) * | 1985-12-07 | 1987-06-10 | Revvo Castor Co Ltd | Castor assemblies |
| WO2002002956A1 (en) * | 2000-07-05 | 2002-01-10 | Bleistahl-Produktions Gmbh & Co. Kg | Sliding bearing with a solid lubricant |
-
2005
- 2005-09-07 GB GB0518201A patent/GB2429907A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882617A (en) * | 1960-03-23 | 1961-11-15 | Thomas Ltd Martin | Improvements in or relating to castors |
| US3283358A (en) * | 1964-09-16 | 1966-11-08 | Richard S Merriam | Heavy duty caster |
| US3318432A (en) * | 1965-09-22 | 1967-05-09 | Westinghouse Electric Corp | Wheeled transportation assemblies |
| GB1376148A (en) * | 1972-12-11 | 1974-12-04 | Flexello Castors Wheels Ltd | Wheel mounting and braking assembly |
| GB2183468A (en) * | 1985-12-07 | 1987-06-10 | Revvo Castor Co Ltd | Castor assemblies |
| WO2002002956A1 (en) * | 2000-07-05 | 2002-01-10 | Bleistahl-Produktions Gmbh & Co. Kg | Sliding bearing with a solid lubricant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725093A (en) * | 2018-05-22 | 2018-11-02 | 平湖市义合箱包有限公司 | A kind of universal wheel of automatic plus lubricating oil for luggage |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0518201D0 (en) | 2005-10-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |