Pressing ring, joint, and valve
AssigneeKubota Corporation
InventorsShozo Kishi, Takaaki Kagawa, Kazuya Ito
Life of this patent
Estimating the term…
Abstract
A first projection is formed on the outer periphery of a bulb part, a second projection is formed on the socket rear end of the bulb part, a tapered part is formed with a decreasing diameter from the inner periphery of a heel part to the inner periphery of the second projection, and a third projection is formed on the tapered part. A first dimension B from the first projection to the third projection in an inclination direction opposite to an inclination direction G of the tapered part is smaller than a second dimension C from the first projection to the second projection in a radial direction A.
Claims21
A pressing ring for pressing an annular sealing member of a joint to a rear of a socket of the joint, wherein the socket is formed on a first passage forming member, wherein the spigot is formed on a second passage forming member and lies in the socket, wherein the annular sealing member lies in a sealing member insertion space, wherein an inner periphery of the rear of the socket has a peripheral wall protruding inward in a radial direction of the second passage forming member, wherein the sealing member insertion space is located between an opening end face of the socket, the peripheral wall of the socket, an outer circumference of the spigot, and an inner circumference of the socket, wherein the pressing ring is fitted onto the spigot, wherein the joint joins the first passage forming member and the second passage forming member, wherein the spigot lies in the socket, wherein the pressing ring is movable by a pressing member along an axis of the second passage forming member in a pressing direction, wherein the pressing ring is fastened to the socket with a plurality of bolts, the pressing ring comprising:
- a plurality of bolt insertion holes into which the plurality of bolts are inserted;
- a pressing face in contact with an end of the annular sealing member and arranged opposing the opening end face of the socket at a predetermined distance from the opening end face of the socket, the pressing face being configured to press the annular sealing member;
- a plurality of protrusions arranged outside of the plurality of bolt insertion holes in the radial direction of the second passage forming member to contact the opening end face of the socket and arrange the pressing face at the predetermined distance from the opening end face of the socket;
- and
- an escaping portion dimensioned to allow a part of the annular sealing member to escape when the part of the annular sealing member is pressed by the pressing face, the escaping portion being a recessed portion dimensioned to create an opening near an area of the opening end face of the socket that is opposed to the escaping portion, the escaping portion being arranged inside of the plurality of bolt insertion holes in the radial direction of the second passage forming member and outside of the pressing face in the radial direction of the second passage forming member, the escaping portion being recessed from the pressing face in a drawing direction of the spigot,
- wherein, in the radial direction of the second passage forming member, a clearance between the inner circumference of the socket and the outer circumference of the spigot is less than a distance between the outer circumference of the spigot and the escaping portion.
A joint for joining a first passage forming member and a second passage forming member, the joint comprising:
- a socket formed on the first passage forming member, a rear of the socket having an inner periphery, the inner periphery having a peripheral wall protruding inward in a radial direction of the second passage forming member;
- a spigot formed on the second passage forming member, the spigot lying in the socket;
- an annular sealing member positioned within a sealing member insertion space, the sealing member insertion space being located between an opening end face of the socket, the peripheral wall of the socket, an outer circumference of the spigot, and an inner circumference of the socket;
- a plurality of bolts;
- and
- a pressing ring fastened to the socket with the plurality of bolts and fitted onto the spigot, the pressing ring being configured to press the annular sealing member to the rear of the socket, the pressing ring being movable by a pressing member along an axis of the second passage forming member in a pressing direction, the pressing ring comprising:
- a plurality of bolt insertion holes into which the plurality of bolts are inserted;
- a pressing face in contact with an end of the annular sealing member and arranged opposing the opening end face of the socket at a predetermined distance from the opening end face of the socket, the pressing face being configured to press the annular sealing member;
- a plurality of protrusions arranged outside of the plurality of bolt insertion holes in the radial direction of the second passage forming member to contact the opening end face of the socket and arrange the pressing face at the predetermined distance from the opening end face of the socket;
- and
- an escaping portion dimensioned to allow a part of the annular sealing member to escape when the part of the annular sealing member is pressed by the pressing face, the escaping portion being a recessed portion dimensioned to create an opening near an area of the opening end face of the socket that is opposed to the escaping portion, the escaping portion being arranged inside of the plurality of bolt insertion holes in the radial direction of the second passage forming member and outside of the pressing face in the radial direction of the second passage forming member, the escaping portion being recessed from the pressing face in a drawing direction of the spigot,
- wherein, in the radial direction of the second passage forming member, a clearance between the inner circumference of the socket and the outer circumference of the spigot is less than a distance between the outer circumference of the spigot and the escaping portion,
- wherein the first and second passage forming members are pipes, and
- wherein the pressing ring is movable by the pressing member along the axis of the second passage forming member in the pressing direction so as to press the annular sealing member into the sealing member insertion space until the protrusions contact the socket.
A joint for joining a first passage forming member and a second passage forming member, the joint comprising:
- a socket formed on the first passage forming member, a rear of the socket having an inner periphery, the inner periphery having a peripheral wall protruding inward in a radial direction of the second passage forming member;
- a spigot formed on the second passage forming member, the spigot lying in the socket;
- an annular sealing member positioned within a sealing member insertion space, the sealing member insertion space being located between an opening end face of the socket, the peripheral wall of the socket, an outer circumference of the spigot, and an inner circumference of the socket;
- a plurality of bolts;
- and
- a pressing ring fitted onto the spigot, the pressing ring being configured to press the annular sealing member to the rear of the socket, the pressing ring being movable by a pressing member along an axis of the second passage forming member in a pressing direction, the pressing ring comprising:
- a plurality of bolt insertion holes into which the plurality of bolts are inserted;
- a pressing face in contact with an end of the annular sealing member and arranged opposing the opening end face of the socket at a predetermined distance from the opening end face of the socket, the pressing face being configured to press the annular sealing member;
- a plurality of protrusions arranged outside of the plurality of bolt insertion holes in the radial direction of the second passage forming member to contact the opening end face of the socket and arrange the pressing face at the predetermined distance from the opening end face of the socket;
- and
- an escaping portion dimensioned to allow a part of the annular sealing member to escape when the part of the annular sealing member is pressed by the pressing face, the escaping portion being a recessed portion dimensioned to create an opening near an area of the opening end face of the socket that is opposed to the escaping portion, the escaping portion being arranged inside of the plurality of bolt insertion holes in the radial direction of the second passage forming member and outside of the pressing face in the radial direction of the second passage forming member, the escaping portion being recessed from the pressing face in a drawing direction of the spigot,
- wherein, in the radial direction of the second passage forming member, a clearance between the inner circumference of the socket and the outer circumference of the spigot is less than a distance between the outer circumference of the spigot and the escaping portion,
- wherein one of the first and second passage forming members is a valve and the other of the passage forming members is a pipe, and
- wherein the pressing ring is movable by the pressing member along the axis of the second passage forming member in the pressing direction so as to press the annular sealing member into the sealing member insertion space until the protrusions contact the socket.
Dependencies are inferred from the claim text.