Brake shoe for elevator emergency stop

A device for elevator emergency stop comprising:

• an elastic member having a U shape opening and closing in a horizontal direction;
• a pair of guide members opposing each other and having outer surfaces contacting the ends of said elastic member, respectively, and inner surfaces inclining such that a gap between said guide members gradually decreases toward the upper ends of said guide members;
• a rail having a T-shaped cross section, positioned between said guide members and extending in a vertical direction;
• a pair of brake shoes provided in the gap between said guide members, arranged symmetrically with respect to said rail so as to move vertically along the inner surfaces of the guide members, and having braking faces opposing each other;
• and
• a pair of pulling means attached to said brake shoes, respectively, for pulling upward said brake shoes along said guide members, in the case of emergency, to cause said elastic members to press said guide members so that said brake shoes pinch said rail,
• wherein said brake shoe comprises (a) a brake body having a braking face and (b) a braking piece embedded in a braking face side of said brake body,
• said braking piece is made of a composite material containing a ceramic base material selected from the group consisting of silicon nitride, titanium boride, sialon and silicon carbide, and no less than 10 wt % of at least one ceramic material selected from the group consisting of a silicon carbide whisker and a silicon carbide platelet.

An elevator with an emergency stop function comprising:

• an elevating cage;
• an elastic member having a U shape, opening and closing in a horizontal direction and attached to the bottom part of said cage by a supporting means;
• a pair of guide members opposing each other and having outer surfaces contacting the ends of said elastic member, respectively, and inner surfaces inclining such that a gap between said guide members gradually decreases toward the upper ends of said guide members;
• a rail having a T-shaped cross section, positioned between said guide members and extending in a vertical direction;
• a pair of brake shoes provided in the gap between said guide members, arranged symmetrically with respect to said rail so as to move vertically along the inner surfaces of the guide members, and having braking faces opposing each other;
• and
• a pair of pulling means attached to said brake shoes, respectively, for pulling upward said brake shoes along said guide members, at the time when said cage falls due to the breakdown of said elevator, to cause said elastic member to press said guide members so that said brake shoes pinch said rail;
• wherein said brake shoe comprises (a) a brake body having a braking face and (b) a braking piece embedded in a braking face side of said brake body, and
• said braking piece is made of a composite material containing a ceramic base material selected from the group consisting of silicon nitride, titanium boride, sialon and silicon carbide, and no less than 10 wt % of at least one ceramic material selected from the group consisting of a silicon carbide whisker and a silicon carbide platelet.

A device for elevator emergency stop comprising:

• an elastic member having a U shape, opening and closing in a horizontal direction;
• a pair of guide members opposing each other and having outer surfaces contacting the ends of said elastic member, respectively, and inner surfaces inclining such that a gap between said guide members gradually decreases toward the upper ends of said guide members;
• a rail having a T-shaped gross section, positioned between said guide members and extending in a vertical direction;
• a pair of brake shoes provided in the gap between said guide members, arranged symmetrically with respect to said rail so as to move vertically along the inner surfaces of the guide members, and having braking faces opposing each other;
• and
• a pair of pulling means attached to said brake shoes, respectively, for pulling upward said brake shoes along said guide members, in the case of emergency, to cause said elastic members to press said guide members so that said brake shoes pinch said rail;
• wherein said brake shoe comprises (a) a braking face and (b) a braking piece embedded in a braking face side of said brake body,
• said braking piece is made of a composite material containing a ceramic base material selected from the group consisting of silicon nitride, titanium boride, sialon and silicon carbide, and a plurality of ceramic fibers dispersed and embedded in the base material to be present in a vertical state at the braking face.

An elevator with an emergency stop function comprising:

• an elevating cage;
• an elastic member having a V shape, opening and closing in a horizontal direction and attached to the bottom part of said cage by a supporting means;
• a pair of guide members opposing each other and having outer surfaces contacting the ends of said elastic member, respectively, and inner surfaces inclining such that a gap between said guide members gradually decreases toward the upper ends of said guide members;
• a rail having a T-shaped cross section, positioned between said guide members and extending in a vertical direction;
• a pair of brake shoes provided in the gap between said guide members, arranged symmetrically with respect to said rail so as to move vertically along the inner surfaces of the guide members, and having braking faces opposing each other;
• and
• a pair of pulling means attached to said brake shoes, respectively, for pulling upward said brake shoes along said guide members, at the time when said cage falls due to the breakdown of said elevator, to cause said elastic member to press said guide members so that said brake shoes pinch said rail;
• wherein said brake shoe comprises (a) a brake body having a braking face and (b) a braking piece embedded in a braking face side of said brake body,
• said braking piece is made of a composite material containing a ceramic base material selected from the group consisting of silicon nitride, titanium boride, sialon and silicon carbide, and a plurality of ceramic fibers dispersed and embedded in the base material to be present in a vertical state at the braking face.

A device for elevator emergency stop comprising:

• an elastic member having a U shape, opening and closing in a horizontal direction;
• a pair of guide members opposing each other and having outer surfaces contacting the ends of said elastic member, respectively, and inner surfaces inclining such that a gap-between said guide members gradually decreases toward the upper ends of said guide members;
• a rail having a T-shaped cross section, positioned between said guide members and extending in a vertical direction;
• a pair of brake shoes provided in the gap between said guide members, arranged symmetrically with respect to said rail so as to move vertically along the inner surfaces of the guise members, and having braking faces opposing each other;
• and
• a pair of pulling means attached to said brake shoes, respectively, for pulling upward said brake shoes along said guide members, in the case of emergency, to cause said elastic member to press said guide members so that said brake shoes pinch said rail;
• wherein said brake shoe comprises (a) a brake body having a braking face and (b) a plurality of braking pieces embedded in a braking face side of the brake body to be projected from the braking face to form projections of a column or a multi-cornered pole having rounded corners, and
• wherein said braking pieces are made of a composite material containing a ceramic base material selected from the group consisting of silicon nitride, silicon carbide and sialon, and particles of at least one ceramic material selected from the group consisting of a carbide, a nitride and a boride, each having diameters in the range of 10 to 150 .mu.m and dispersed into the ceramic base material.

An elevator with an emergency stop function comprising:

• an elevating cage;
• an elastic member having a U shape, opening and closing in a horizontal direction and attached to the bottom part of said cage by a supporting means;
• a pair of guide members opposing each other and having outer surfaces contacting the ends of said elastic member, respectively, and inner surfaces inclining such that a gap between said guide members gradually decreases toward the upper ends of said guide members;
• a rail having a T-shaped cross section, positioned between said guide members and extending in a vertical direction;
• a pair of brake shoes provided in the gap between said guide members, arranged symmetrically with respect to said rail so as to move vertically along the inner surfaces of the guide members, and having braking faces opposing each other;
• and
• a pair of pulling means attached to said brake shoes, respectively, for pulling upward said brake shoes along said guide members, at the time when said cage falls due to the breakdown of said elevator, to cause said elastic members to press said guide members to thee said brake shoes pinch said rail;
• wherein said brake shoe comprises (a) a brake body having a braking face and (b) a plurality of braking pieces embedded in a braking face side of the brake body to be projected from the braking face to form projections of a column or a multi-cornered pole having rounded comers, and said braking pieces are made of a composite material containing a ceramic base material selected from the group consisting of silicon nitride, silicon carbide and sialon, and particles of at least one ceramic material selected from the group consisting of a carbide, a nitride and a boride, each having particle sizes in the range of 10 to 150 .mu.m and dispersed into the ceramic base material.