US 5,465,815 AGranted

Magnetic brake

OwnerIwao Ikegamiinventor

Life of this patent

Estimating the term…

Abstract

A brake apparatus applies a braking force from a stationary member to a moving member adapted to move relative to the stationary member. Magnets are arranged on the stationary member along the linear motion or rotational direction of the moving member and magnets are arranged on the moving member so that the stationary side magnets face the moving side magnets. When magnetic attractive/repulsive forces between the magnets on the moving and stationary members act in a direction to accelerate the moving member, the magnets on either one side are allowed to escape in the same direction. When magnetic attractive/repulsive forces act in a direction to decelerate the moving member, the magnets are restrained from movement in the same direction. This brake avoids any temperature rise due to local heat generation during braking.

Claims15

Dependent claims

A brake apparatus applying a braking force from a stationary member to a moving member adapted to move along a predetermined orbit relative to the stationary member wherein

said stationary member carries thereon a row of at east one magnet such that a plurality of magnetic poles are arranged along the orbit of said moving member,
said moving member carries thereon a row of at least one permanent magnet such that a plurality of magnetic poles are arranged along the orbit of said moving member and such that the plurality of magnetic poles face the magnetic poles of the magnet row on said stationary member when said moving member moves,
at least one magnet row of the magnet row on said stationary member and the magnet row on said moving member, on its side facing the other magnet row, has magnetic poles of opposite sign alternately arranged in the direction of said orbit,
either one magnet row of the magnet row on said stationary member and the magnet row on said moving member is fixedly secured to the member carrying it, and
the other magnet row or each magnet therein is coupled to the member carrying it through a selective interlocking means such that when a magnetic attractive force and a magnetic repulsive force between the magnetic poles of the other magnet row and the magnetic poles of the one magnet row acts in a direction to accelerate motion of said moving member, said other magnet row or each magnet is allowed for movement relative to the member carrying it in a direction including the direction of the magnetic attractive force and magnetic repulsive force acting, and when a magnetic attractive force and a magnetic repulsive force between the magnetic poles of the other magnet row and the magnetic poles of the one magnet row acts in a direction to decelerate motion of said moving member, said other magnet row or each magnet is restrained from movement relative to the member carrying it in a direction including the direction of the magnetic attractive force and magnetic repulsive force acting.

2 more elements

Dependencies are inferred from the claim text.

patentgrep

Loading patent…

Abstract

A brake apparatus applying a braking force from a stationary member to a moving member adapted to move along a predetermined orbit relative to the stationary member wherein

said stationary member carries thereon a row of at east one magnet such that a plurality of magnetic poles are arranged along the orbit of said moving member,
said moving member carries thereon a row of at least one permanent magnet such that a plurality of magnetic poles are arranged along the orbit of said moving member and such that the plurality of magnetic poles face the magnetic poles of the magnet row on said stationary member when said moving member moves,
at least one magnet row of the magnet row on said stationary member and the magnet row on said moving member, on its side facing the other magnet row, has magnetic poles of opposite sign alternately arranged in the direction of said orbit,
either one magnet row of the magnet row on said stationary member and the magnet row on said moving member is fixedly secured to the member carrying it, and
the other magnet row or each magnet therein is coupled to the member carrying it through a selective interlocking means such that when a magnetic attractive force and a magnetic repulsive force between the magnetic poles of the other magnet row and the magnetic poles of the one magnet row acts in a direction to accelerate motion of said moving member, said other magnet row or each magnet is allowed for movement relative to the member carrying it in a direction including the direction of the magnetic attractive force and magnetic repulsive force acting, and when a magnetic attractive force and a magnetic repulsive force between the magnetic poles of the other magnet row and the magnetic poles of the one magnet row acts in a direction to decelerate motion of said moving member, said other magnet row or each magnet is restrained from movement relative to the member carrying it in a direction including the direction of the magnetic attractive force and magnetic repulsive force acting.

2 more elements