GB2260167A - Turntable element - Google Patents
Turntable element Download PDFInfo
- Publication number
- GB2260167A GB2260167A GB9222847A GB9222847A GB2260167A GB 2260167 A GB2260167 A GB 2260167A GB 9222847 A GB9222847 A GB 9222847A GB 9222847 A GB9222847 A GB 9222847A GB 2260167 A GB2260167 A GB 2260167A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turntable element
- bearing
- turntable
- tray
- bearing holder
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/52—Cages for rollers or needles with no part entering between, or touching, the bearing surfaces of the rollers
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B11/00—Tables with tops revolvable on vertical spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/30—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/49—Cages for rollers or needles comb-shaped
- F16C33/494—Massive or moulded comb cages
- F16C33/495—Massive or moulded comb cages formed as one piece cages, i.e. monoblock comb cages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/08—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2322/00—Apparatus used in shaping articles
- F16C2322/39—General build up of machine tools, e.g. spindles, slides, actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M2200/00—Details of stands or supports
- F16M2200/08—Foot or support base
Abstract
A turntable element comprises a substantially flat bearing member holder (16) and a plurality of bearing members (26) which are rotatably engaged in respective apertures (24) extending inwardly towards the centre of rotation of the turntable element from the outer edge of the holder (16). The bearing members are retained in their apertures by portions (30) which engage the inner edge of the holder. The element may be formed as an integral plastics body wherein the bearing members are forcibly displaced so as to break frangible webs and bring the members into rotatable engagement with the holder. <IMAGE>
Description
TURNTABLE
This invention relates to a turntable and in particular to a turntable element which facilitates rotation of equipment, such as a television set, relative to the furniture on which it is supported and a method of making such a turntable.
Turntable units are known which typically comprise a lower plate or board as a base member and an upper plate or board as a rotatable support member which carries the equipment to be rotated. The two boards are generally pivotally connected via a shaft member, and to improve relative movement of the boards a turntable element including a number of bearings nay be provided between them. The bearings may be in the form of ball-bearings or rollers and are typically mounted in a bearing plate or disc which is interposed between the two boards.
An example of such a turntable unit is shown and described in US -A- 4 697 773. Such a turntable element is relatively expensive to produce because the bearings have to be manufactured as separate items and then individually located and fitted into their apertures in the bearing plate or disc.
One object of the present invention is to enable turntable elements, which include rotatable bearings, to be manufactured more economically.
According to the invention there is provided a method of making a turntable element which includes a substantially flat bearing holder with which are rotatably engaged a plurality of bearing members, the method comprising forming the bearing holder and bearing members as an integral body including frangible portions linking the bearing members to the bearing holder, and forcibly displacing the bearing members so as to break the frangible portions and bring the bearing members into rotatable engagement with the bearing holder.
In such a method, only a single forming step is required for the bearing holder and all of the bearing members, rather than these components having to be made separately. Further, the bearing members do not have to be pre-located relative to the bearing holder for the purpose of assembly since they are inherently located in their correct positions by the frangible portions. A simple forced ~ displacement of each bearing member is all that is required to complete the production of the turntable element with all its bearing elements rotatable in their proper positions.
According to another aspect of the invention there is provided a turntable element manufactured in accordance with the above method.
According to a further aspect of the invention there is provided a turntable element comprising a substantially flat bearing holder with which are rotatably engaged a plurality of bearing members, each bearing member being received in an aperture which extends from an outer edge of the bearing holder radially inwards relative to a centre of rotation of the turntable element, the bearing members being radially retained in their rotatably engaged positions by cooperating retaining portions on the bearing members and the bearing holder.
In order that the invention may be better understood an embodiment thereof will be described, by way of example, with reference to the accompanying drawings, in which;
FIGURE 1 is a cut-away perspective view showing a turntable element according to the invention when in use.
FIGURE 2 is a sectional view of the turntable element of Figure 1.
FIGURE 3 is a plan view of a turntable element according to the invention during manufacture.
FIGURE 4 shows a detail of a roller bearing of a turntable element according to the invention during manufacture.
FIGURE 5 shows a detail of the roller bearing of
Figure 4 when the turntable element is ready for use.
FIGURE 6 is a view in the direction A shown in
Figure 5.
FIGURE 7(a) shows a tray which may be attached to the turntable element according to a preferred embodiment of the invention.
FIGURE 7(b) shows a detail of another tray which may be attached to the turntable element according to a preferred embodiment of the invention.
Referring firstly to Figures 1 and 2 a turntable element 10 according to the invention is shown positioned for use in association with an upper rotatable support board 12 and a lower base board 14.
The turntable element 10 is interposed between the two boards as shown and a central shaft 8 passes through it, rotatably connecting the two boards so that they can move freely relative to one another.
The turntable element 10 comprises a generally disc-shaped bearing a holder, having a central disc 15 and an outer ring portion 16, connected by radial spokes 18. A central aperture 20 is provided to allow the shaft 8 to pass through the turntable element 10.
In order to facilitate rotational movement of the two boards relative to one another the ring portion 16 of the bearing holder is provided with a number of circumferentially spaced cylindrical roller bearings 22 as will be described in more detail below.
The roller bearings 22 are received in apertures 24 in the ring portion 16 with their axes aligned radially relative to the centre of rotation of the turntable element 10. When the turntable element 10 is interposed between the upper and lower boards 12, 14 as shown in Figures 1 and 2, and a load is applied to the upper support board 12, such as a television set placed thereon, the load is evenly distributed over all of the roller bearings 22. The rollers will rotate, describing a circular path on the boards when the load is turned, thus allowing the upper support board 12 to rotate whilst the lower base board 14 remains stationary.
Referring now to Figures 4, 5 and 6 the manufacture and construction of the turntable element 10, and in particular the roller bearings 22, will be described in more detail. As can be seen each roller bearing 22 essentially comprises two portions; the roller 26 and a coaxial shaft portion 28. The shaft portion 28 is provided with a retaining member 30 in the form of a skirt axially spaced from its end, the function of which will be described below. The end faces of the rollers 26 each have a domed protrusion 42, the purpose of which will be described later.
The turntable element 10 is formed from an injection plastics material and the whole item, including the roller bearings 22, is integrally formed in a single moulding process. Figure 4 shows a detail of one of the rollers in its initial state immediately after moulding. Each aperture 24 is formed with its axis aligned along a radius of the turntable element 10, is open at the outer edge of the ring portion 16, and extends in depth across a substantial part of the width of the ring portion 16.
The aperture includes a slot in the top and bottom surfaces of the ring portion 16. The depth of the aperture 24 corresponds to the width of the roller 26.
The cross-section of the aperture 24 can be seen in Figure 6. On the top surface of the turntable element 10 one edge of the aperture slot is undercut forming a slight projection 32. On the lower surface the diagonally opposed edge is undercut forming a complementary projection. These projections 32 act as guides for the roller bearings 22 but are not adequate to retain the rollers 26 in the apertures 24 without the additional action of the retaining member 30 on the shaft portion 28, to be described below.
From the base of the aperture 24, that is the end closest to the centre of the turntable element 10, to the inner edge of the ring portion 16 a housing in the form of a cylindrical bore 34 is provided which is open at its inner end. The bore 34 is formed coaxially with the shaft portion 28 of the roller bearing 22, the inner end of the shaft portion 28 being level with the base of the aperture 24 and connected thereto by a frangible web 36. When the turntable element 10 has been moulded each roller bearing 22 can be driven into position with its shaft portion 28 in the bore 34 by applying a force to the end face of the roller portion 26, the force being directed radially with respect to the turntable element 10.This action will break the frangible web 36 connecting the roller bearing shaft portion 28 to the base of the aperture 24 and drive the roller bearing 22 into its housing. The flexibility of the plastics material used in the manufacture of the turntable element 10 allows the wider diameter retaining member 30 of the shaft portion 28 to be forced through the bore 34 where it engages with the inner side of the ring portion 16, the engagement rotatably retaining the roller bearing 22 in the aperture 24. The retaining member 30 is so positioned on the shaft portion 28, and the length of the shaft portion 28 so chosen, that when it locates on the inner side of the ring portion 16, the roller 26 is located in the aperture 24. The roller 26 and the shaft portion 28 are then free to rotate in the aperture 24 and the bore 34, respectively.
The diameter of the rollers 26 is chosen to be slightly greater than the thickness of the bearing holder 10 so that they protrude sufficiently from the slots of their respective apertures 24 to provide surfaces for rolling contact with the boards 12, 14.
As so far described, the turntable element 10 has been used interposed between two boards 12, 14 rotatably fixed together by a central shaft member 8.
If it is intended that the turntable be used on an article of furniture it is advantageous to dispense with the lower board 14 and fix the turntable element 10 and upper support board 12 directly to the top surface of the article of furniture in question.
However, this would require the drilling of a hole in the furniture which is clearly undesirable. In a preferred embodiment of the invention the turntable element 10, as already described, is provided with a tray 40 in place of the lower board member 14. This tray 40 provides the lower surface on which the roller bearings 22 move. The tray may be disc-shaped with an outer ring, radial spokes and a central aperture 44, similar in shape to the turntable element 10.
Attachment td the turntable element 10 can be by way of a central shaft or pin which also passes into the upper board 12, rotatably connecting the tray 40 and the upper board 12. An example of such a tray element is shown in Figure 7(a). As can be seen, the tray has a raised circumferential edge 46 to contain the turntable element 10, and a ribbed surface 48 which acts as a grip to keep the tray in position on the surface on which it is placed. Alternatively, the tray element 40 may be in the form of a simple ring of the same size as the ring portion 16 of the turntable element 10, also having a raised outer circumferential edge as seen in Figure 7(b). This edge is undercut as shown so that it provides a snap-fit engagement with the turntable element 10 by locating over the small domed protrusions 42 on the ends of the rollers 26.
Stop members may be incorporated in the turntable arrangement to limit the angle through which it can be rotated. Examples of such stop members can be seen in
Figure 1. These are placed in the two boards at angularly separated positions but at the same radial distance from the axis of rotation so that they will butt up against each other at a certain relative position of the moving and stationary parts of the turntable, and prevent rotation beyond that position.
Claims (9)
1. A turntable element comprising a substantially flat bearing holder with which are rotatably engaged a plurality of bearing members, each bearing member being received in an aperture which extends from an outer edge of the bearing holder radially inwards relative to a centre of rotation of the turntable element, the bearing members being radially retained in their rotatably engaged positions by cooperating retaining portions on the bearing member and the bearing holder.
2. A turntable element as claimed in claim 1, wherein the bearing holder comprises a central disc portion and an outer ring portion connected by a plurality of radial spokes, the bearing members being rotatably engaged with the outer ring portion of the bearing holder.
3. A turntable element as claimed in claim 1 or 2, in combination with a support board member superposed on the turntable element and located relative thereto by a central pivot.
4. A turntable element as claimed in claim 1, 2 or 3, in combination with, and superposed on, a base member on which the bearing members can move.
5. A turntable element as claimed in claim 4, wherein said base member is a tray.
6. A turntable element as claimed in claim 5 wherein the tray is located relative to the bearing holder by a central pivot.
7. A turntable element as claimed in claim 5, wherein the tray has a raised outer edge and the turntable element is provided with protrusions on its periphery, the edge of the tray being adapted to locate over the protrusions in snap-fit engagement.
8. A turntable element as claimed in any one of claims 5 to 7, wherein the tray is provided on its underside with gripping ribs.
9. A turntable element substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9222847A GB2260167B (en) | 1989-12-11 | 1992-10-30 | Turntable |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8927947A GB2239390B (en) | 1989-12-11 | 1989-12-11 | Turntable |
GB9222847A GB2260167B (en) | 1989-12-11 | 1992-10-30 | Turntable |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9222847D0 GB9222847D0 (en) | 1992-12-16 |
GB2260167A true GB2260167A (en) | 1993-04-07 |
GB2260167B GB2260167B (en) | 1993-09-08 |
Family
ID=26296350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9222847A Expired - Fee Related GB2260167B (en) | 1989-12-11 | 1992-10-30 | Turntable |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2260167B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1079059A3 (en) * | 1999-08-23 | 2001-09-19 | GRUNDIG Aktiengesellschaft | Supporting element |
WO2004114103A3 (en) * | 2003-06-13 | 2005-07-28 | Humanscale Corp | Laptop holder |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB410891A (en) * | 1932-12-14 | 1934-05-31 | Ransome And Marles Bearing Com | Improvements in or relating to ball, roller and like anti-friction bearings |
DE2240074A1 (en) * | 1972-03-21 | 1973-08-30 | Fulterer & Co Kg | PULL-OUT DEVICE FOR SLIDING PARTS ON FURNITURE |
US4485997A (en) * | 1983-09-21 | 1984-12-04 | Frank Potter | Rotatable base unit support for a file cabinet |
US4697778A (en) * | 1985-07-25 | 1987-10-06 | Kabushiki Kaisha Murakoshi Seiko | Television turntable for providing improved stability |
-
1992
- 1992-10-30 GB GB9222847A patent/GB2260167B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB410891A (en) * | 1932-12-14 | 1934-05-31 | Ransome And Marles Bearing Com | Improvements in or relating to ball, roller and like anti-friction bearings |
DE2240074A1 (en) * | 1972-03-21 | 1973-08-30 | Fulterer & Co Kg | PULL-OUT DEVICE FOR SLIDING PARTS ON FURNITURE |
US4485997A (en) * | 1983-09-21 | 1984-12-04 | Frank Potter | Rotatable base unit support for a file cabinet |
US4697778A (en) * | 1985-07-25 | 1987-10-06 | Kabushiki Kaisha Murakoshi Seiko | Television turntable for providing improved stability |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1079059A3 (en) * | 1999-08-23 | 2001-09-19 | GRUNDIG Aktiengesellschaft | Supporting element |
WO2004114103A3 (en) * | 2003-06-13 | 2005-07-28 | Humanscale Corp | Laptop holder |
US7487940B2 (en) | 2003-06-13 | 2009-02-10 | Humanscale Corporation | Laptop holder |
Also Published As
Publication number | Publication date |
---|---|
GB2260167B (en) | 1993-09-08 |
GB9222847D0 (en) | 1992-12-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19961211 |