Land vehicles: wheels and axles – Wheel
Patent
1997-07-23
1998-11-10
Stormer, Russell D.
Land vehicles: wheels and axles
Wheel
301 647, B60B 300
Patent
active
058333240
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a wheel, especially a wheel for shopping trolleys or carts, such wheel comprising a wheel body, which has a hub part and a peripheral part, where the peripheral part has axially separated, circular annular flange parts, which form a running surface on the wheel body, and, lying between the annular flanges, a peripheral surface, which comprises surface portions in a polygonal configuration around the periphery of the wheel body.
DESCRIPTION OF THE PRIOR ART
Shopping trolley wheels of the above-mentioned type are known, in which the wheel can facilitate keeping the trolley stationary when it is being transported on an inclined escalator-type conveyor belt, by the running surfaces of the wheels being made of axially separated, circular peripheral angular flanges which can fall down into the longitudinal grooves on the bearing surface or the conveyor belt, so that one of the flat peripheral surfaces in the polygonal configuration lying between the annular flanges can rest in contact against the upper side of the conveyor belt and in this way make an undesirable rolling of the wheel more difficult. Such wheels have been made as solid, relatively heavy wheel bodies.
In order to achieve a relatively light wheel construction, it has earlier been suggested to make wheel bodies from two complementary, bowl-shaped wheel halves joined together in order to form a relatively hollow wheel body. The peripheral parts of the wheel halves in such a wheel body can in this way be held together and joined to each other through a tread being moulded around the outer periphery of the wheel body (cf., for example, SE-A-9402565-7). Such an enclosing moulding of a tread around the peripheral surface of the wheel halves is, however, not possible in a wheel of the type described in the introduction.
SUMMARY OF THE INVENTION
An object of the present invention is to achieve a wheel made of two wheel halves joined together, which has axially separated circular peripheral annular flanges and has a polygonal peripheral surface between the annular flanges, where the peripheral parts of the wheel halves are held together by an elastic ring which at the same time can be used as a noise and vibration damper to let the wheel roll quietly and comfortably.
This object is achieved by a wheel of the type described in the introduction by the wheel body being made up of complementary wheel halves, where each wheel half has near the peripheral part a groove extending completely around the wheel half and which, radially inside the peripheral planar surfaces, extends axially inwardly from the outside of the respective wheel half to an essentially radial, inner web part in the respective wheel half, said web part in the wheel halves having axial openings establishing communication between the grooves of the two wheel halves, the peripheral parts of the wheel halves being held together by an elastic material injected into the grooves and openings.
The invention also concerns a method for manufacturing such a wheel, in which the method is characterised in that the two complementary wheel halves are placed together and positioned in a mold, whereafter the peripheral parts of the two wheel halves are fixed to each other by injection of an elastic material in the mutually communicating space in the wheel halves, which goes all around, and lies radially inside, the peripheral planar surfaces of the wheel.
Preferably simultaneously with the fixing of the peripheral parts of the wheel halves, a fixing of the hub parts in the same takes place through an at least partially enclosing die cast moulding of a cylindrical bearing set in the hub part.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details and characteristics of the invention will be made clear below with reference to the accompanying drawings, in which:
FIG. 1 is a cross-section through two complementary wheel halves placed together before fixing of the hub and peripheral parts of the wheel halves;
FIG. 2 is a side view of one of the wheel
REFERENCES:
patent: 1865432 (1932-07-01), Bossert
patent: 3578812 (1971-05-01), Taussig et al.
patent: 3843202 (1974-10-01), Lacerte
patent: 3894776 (1975-07-01), Black
patent: 4217944 (1980-08-01), Pascal
patent: 4818034 (1989-04-01), Djerf
patent: 4919489 (1990-04-01), Kopsco
patent: 4943101 (1990-07-01), Chapman
patent: 5174633 (1992-12-01), Kidd et al.
patent: 5551763 (1996-09-01), Alsman
Industriverktyg AB
Stormer Russell D.
LandOfFree
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