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US4331918A Expired / Lapsed US ⏱️ 0.0 years remaining

Speedometer for cycles and mopeds

Assignee: Basta Lasefabrik AS
•
Filing: 1980-05-21
•
Granted: 1982-05-25
•
Expires: 2000-05-21
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Abstract

Abstract Speedometer for cycles and mopeds, of the type by which the measurement is effected by means of a reed relay secured to a stationary part of the vehicle and a number of permanent magnets fastened to one of its wheels, said magnets being arranged to move past the reed relay during the rotation of the wheel. The permanent magnets (4) are molded into a holder (3), said holder being secured to the spokes (2) of the wheel by means of an associated part (14), said associated part (14) being inside the wheel and fastened to the holder (3) in such a way that the two parts (3) and (14) can be secured to the spokes (2) of the wheel. The permanent magnets (4) are positioned in the holder (3) at the same radii from the hub of the wheel, and at the same mutual distance between individual magnets (4). The holder (3) and the associated part (14) can be produced of synthetic material, and said associated part (14) can consist of two half parts.

Inventors

  • 👤 Poul Dunch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 16:15
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/484

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 127 words
A sensor assembly for a speedometer, the assembly including a reed switch, means for mounting the reed switch on a stationary part of a spoked wheel vehicle adjacent to the spokes of a wheel thereof, a plurality of permanent magnets, and means for attaching the permanent magnets to spokes of the wheel so as to move past the reed switch when the wheel rotates, the improvement wherein: said means for attaching the permanent magnets to spokes of a wheel comprises a non-magnetic annular holder having the permanent magnets embedded therein at equally spaced angular intervals and means for securing the annular holder concentrically with the axis of wheel rotation against the spokes of a wheel on the side adjacent to the mounting location of the reed switch.
Claim 2
Dependent Claim 127 words
A sensor assembly for a speedometer, the assembly including a reed switch, means for mounting the reed switch on a stationary part of a spoked wheel vehicle adjacent to the spokes of a wheel thereof, a plurality of permanent magnets, and means for attaching the permanent magnets to spokes of the wheel so as to move past the reed switch when the wheel rotates, the improvement wherein: said means for attaching the permanent magnets to spokes of a wheel comprises a non-magnetic annular holder having the permanent magnets embedded therein at equally spaced angular intervals and means for securing the annular holder concentrically with the axis of wheel rotation against the spokes of a wheel on the side adjacent to the mounting location of the reed switch.
Claim 3
Dependent Claim 60 words
A sensor assembly according to claim 1 wherein the means for securing the annular holder comprises a ring having the same mean diameter as the annular holder, the ring being divided into two arcuate segments for placement on the other side of the spokes from the annular holder, and threaded fasteners for joining the two-part ring to the annular holder.
Claim 4
Dependent Claim 21 words
A sensor assembly according to claim 2 wherein the annular holder and the two-part ring are molded from a synthetic material.
Claim 5
Dependent Claim 38 words
A sensor assembly according to claim 1 or 6 wherein the annular holder has a planar face perpendicular to the axis of the holder, and the magnets are embedded into the annular holder flush with said planar face.
Claim 6
Dependent Claim 77 words
A sensor assembly according to claim 4 wherein each magnet is an elongated bar magnet having a north pole at one end and a south pole at the other end, and the magnets are disposed in the annular holder with their longitudinal axes tangent to a circle concentric with the axis of the holder and parallel to said planar face, so said north and south poles pass the reed switch in alternating sequence when the wheel rotates.

References Cited (Backward Citations)

GB557948A Cited
US2692951A Cited
GB1161984A Cited
US3417289A Cited
US3505595A Cited
US3559205A Cited
GB1315442A Cited
US3739367A Cited
US3898563A Cited
US4019171A Cited
US4025819A Cited
US4156190A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-05-24 1985-11-23 1986-05-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-05-24 1989-11-23 1990-05-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-05-24 1993-11-23 1994-05-25 $7700.00 Window Closed / Lapsed

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