Variable magnetic resistance unit for an exercise device
DCFirst Claim
1. A bicycle trainer, comprising:
- a frame configured to support a bicycle having a driven wheel; and
a resistance device secure as a unit to the frame, wherein the resistance device comprises;
a housing supported by the frame;
a roller rotatably supported by the housing, wherein the roller is arranged engage the driven wheel of the bicycle for rotation in response to rotation of the driven wheel;
a rotatable member rotatably supported by the housing and interconnected with the roller for rotation in response to rotation of the driven wheel, wherein the rotatable member is rotatable about an axis of rotation in response to rotation of the driven wheel;
a stationary electrically conductive member mounted to the housing adjacent the rotatable member; and
one or more magnetic members movably mounted to the rotatable member, wherein the magnetic members are movable relative to the stationary electrically conductive member and relative to the axis of rotation in response to variations in the speed of rotation of the rotatable member;
wherein the one or more magnetic members and the electrically conductive member cooperate to form an eddy current force which resists rotation of the rotatable member and thereby resists rotation of the roller and the driven wheel, wherein movement of the one or more magnetic members relative to the stationary electrically conductive member functions to alter the location of the eddy current force relative to the axis of rotation to vary the resistance to rotation of the rotatable member in response to the speed of rotation of the rotatable member caused by rotation of the roller and the driven wheel.
4 Assignments
Litigations
0 Petitions
Accused Products
Abstract
An automatically adjusting magnetic resistance unit for an exercise device such as a bicycle trainer, in which the degree of resistance is automatically and non-linearly adjusted in relation to the rotational speed of a rotating member caused by the input of a user. The rotating member may be in the form of a flywheel having a number of supports extending between a hub and a rim. The supports define longitudinal grooves which slidably retain magnets that are biased inwardly toward the hub by biasing members. An electrically conductive member is located adjacent the flywheel. As the flywheel rotates in response to rotation of the bicycle wheel, the magnets interact with the conductive member to establish eddy currents that provide resistance to the rotation of the flywheel. The speed of rotation of the flywheel increases as the speed of rotation of the bicycle wheel increases, and centrifugal forces act on the magnets to cause the magnets to slide outwardly along the grooves in opposition to the bias of the biasing members. The outward movement of the magnets causes outward movement of the eddy current forces, to increase the resistance provided to rotation of the flywheel and the bicycle wheel. The variable resistance due to the increased or decreased rotational speed of the flywheel is smooth, based on the constant interaction of the counteracting forces of the biasing members and the centrifugal forces acting on the magnets.
-
Citations
24 Claims
-
1. A bicycle trainer, comprising:
-
a frame configured to support a bicycle having a driven wheel; and a resistance device secure as a unit to the frame, wherein the resistance device comprises; a housing supported by the frame; a roller rotatably supported by the housing, wherein the roller is arranged engage the driven wheel of the bicycle for rotation in response to rotation of the driven wheel; a rotatable member rotatably supported by the housing and interconnected with the roller for rotation in response to rotation of the driven wheel, wherein the rotatable member is rotatable about an axis of rotation in response to rotation of the driven wheel; a stationary electrically conductive member mounted to the housing adjacent the rotatable member; and one or more magnetic members movably mounted to the rotatable member, wherein the magnetic members are movable relative to the stationary electrically conductive member and relative to the axis of rotation in response to variations in the speed of rotation of the rotatable member; wherein the one or more magnetic members and the electrically conductive member cooperate to form an eddy current force which resists rotation of the rotatable member and thereby resists rotation of the roller and the driven wheel, wherein movement of the one or more magnetic members relative to the stationary electrically conductive member functions to alter the location of the eddy current force relative to the axis of rotation to vary the resistance to rotation of the rotatable member in response to the speed of rotation of the rotatable member caused by rotation of the roller and the driven wheel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 22)
-
-
13. A bicycle training apparatus, comprising:
-
a) a support frame adapted to support a bicycle having a driven wheel; and b) a resistance unit attached to the support frame, wherein the resistance unit includes a housing, a roller rotatably supported by the housing and engageable with the driven wheel of the bicycle, a shaft extending outwardly from the roller, a stationary electrically conductive member secured to the housing, and a rotatable member attached to the shaft and located adjacent the stationary electrically conductive member, wherein the roller, the shaft and the rotatable member rotate about an axis of rotation, and wherein the rotatable member has at least one radially outwardly movable magnetic element that interacts with the stationary electrically conductive member to establish a resistive eddy current force upon rotation of the rotatable member, wherein the magnetic member is radially movable relative to the axis of rotation in response to the speed of rotation of the rotatable member caused by rotation of the driven wheel of the bicycle to resist rotation of the bicycle wheel. - View Dependent Claims (14, 15, 16, 17, 18)
-
-
19. A resistance unit for an exercise device, comprising:
-
a rotatable member, wherein the rotatable member is rotatable about an axis of rotation; a disc-shaped electrically conductive member located adjacent the rotatable member; a magnetically attractive member mounted to the disc-shaped member to direct the magnetic flux of the magnetic member through the disc-shaped member; and one or more magnetic members movably mounted to the rotatable member, wherein the magnetic members are movable relative to the axis of rotation in response to variations in the speed of rotation of the rotatable member; wherein the one or more magnetic members and the electrically conductive member cooperate to form an eddy current force which resists rotation of the rotatable member, wherein movement of the one or more magnetic members functions to alter the location of the eddy current force relative to the axis of rotation to vary the resistance to rotation of the rotatable member in response to the speed of rotation of the rotatable member.
-
-
20. A resistance unit for an exercise device, comprising:
-
a rotatable member, wherein the rotatable member is rotatable about an axis of rotation; an electrically conductive member located adjacent the rotatable member; and one or more magnetic members movably mounted to the rotatable member, wherein the magnetic members are movable relative to the axis of rotation in response to variations in the speed of rotation of the rotatable member; wherein the one or more magnetic members and the electrically conductive member cooperate to form an eddy current force which resists rotation of the rotatable member, wherein movement of the one or more magnetic members functions to alter the location of the eddy current force relative to the axis of rotation to vary the resistance to rotation of the rotatable member in response to the speed of rotation of the rotatable member; wherein the rotatable member includes a plurality of vanes which circulate air upon rotation of the rotatable member, and wherein the rotatable member is contained within a housing having a plurality of openings to allow circulation of air through the housing upon rotation of the rotatable member.
-
-
21. An bicycle trainer, comprising:
-
a stationary frame configured to support a driven wheel of a bicycle; and a resistance unit mounted to the frame, wherein the resistance unit comprises a housing supported by the frame;
a roller rotatably mounted to the housing, wherein the roller is configured to engage the driven wheel of the bicycle for rotation in response to rotation of the driven wheel;
a stationary electrically conductive member interconnected with the housing, a rotatable member rotatably mounted to the housing and adapted to rotate in response to rotation of the roller caused by rotation of the driven wheel, and an automatically variable magnetic resistance arrangement carried by the rotatable member which interacts with the stationary electrically conductive member to provide eddy current resistance to the roller through the rotatable member, wherein the automatically variable magnetic resistance arrangement is operable to provide an automatically variable non-linear relationship between the speed of the rotatable member and the resistance provided to the roller in response to the speed of rotation of the rotatable member.
-
-
23. An exercise method, comprising the acts of:
-
providing a bicycle having a driven wheel; providing a bicycle trainer having a wheel engaging frame assembly and a resistance unit, the resistance unit including housing;
a stationary electrically conductive member mounted to the housing, a shaft rotatably mounted to the housing, wherein the shaft is connected to a wheel-engaging roller and to a rotatable member, the rotatable member including at least one support, the at least one support having at least one movable magnetic element located adjacent the stationary electrically conductive member that is urged radially inwardly by a biasing member;engaging the driven wheel of the bicycle with the wheel engaging frame assembly so that the driven wheel is supported by the frame assembly and the driven wheel of the bicycle contacts the roller; rotating the driven wheel of the bicycle to rotate the roller, the shaft and the rotatable member about an axis of rotation, wherein the magnetic element interacts with the stationary electrically conductive member to establish an eddy current force that resists rotation of the rotatable member and thereby the bicycle wheel; and varying the radial position of the magnetic element relative to the axis of rotation against the force of the biasing member in response to variations in the speed of rotation of the rotatable member caused by variations in the speed of rotation of the driven wheel of the bicycle, wherein the act of varying the radial position of the magnetic element relative to the stationary electrically conductive member functions to vary the radial position of the eddy current force to vary the degree of resistance to rotation of the rotatable member. - View Dependent Claims (24)
-
Specification