1. A pipe joint with earthquake-proof function, wherein
a lock ring is accommodated in a lock ring accommodating groove formed at an inner surface of a socket of one pipe configuring said pipe joint,
a projection formed at an outer periphery of a distal end of a spigot of another pipe, configuring said pipe joint and being inserted to said socket, is configured to be able to engage with the lock ring from the socket inner side,
disengagement of the spigot from the socket is prevented as said lock ring is configured to be able to engage with said accommodating groove,
a tapered surface converging toward the opening side of the socket is formed on at least one of a portion of said lock ring engaging the accommodating groove and a portion of said accommodating groove engaging the lock ring,
when a disengagement prevention force in a pipe axial direction for preventing the spigot from being disengaged from the socket by said engagement is transmitted from the accommodating groove to the lock ring through the tapered surface, a line of action of a component force of said disengagement prevention force in a direction perpendicular to said tapered surface passes the opening side of the socket of a contacting point between a socket bottom end part of the lock ring and the outer periphery of the spigot along the outer surface of the spigot,
the tapered surface is formed at the portion of the lock ring engaging the accommodating groove, and an inclination angle of the tapered surface with respect to the spigot outer surface changes in accordance with a distance in a radial direction from the spigot outer surface to said engaging portion, and
the inclination angle of the tapered surface with respect to the spigot outer surface gradually decreases as the distance in the radial direction from the spigot outer surface to the accommodating groove engaging portion increases.
2. The pipe joint with earthquake-proof function according to claim 1, wherein the inclination angle of the tapered surface with respect to the spigot outer surface decreases in steps.
3. The pipe joint with earthquake-proof function according to claim 1, wherein the tapered surface is a smooth curved surface in which the inclination angle with respect to the spigot outer surface decreases in a stepless manner.
4. The pipe joint with earthquake-proof function according to claim 1, wherein the tapered surface is a combination of an inclined surface having a linear transverse cross section that changes in steps and a smooth curved surface that changes in a stepless matter.
5. A pipe joint with earthquake-proof function, wherein
a lock ring is accommodated in a lock ring accommodating groove formed at an inner surface of a socket of one pipe configuring said pipe joint,
a projection formed at an outer periphery of a distal end of a spigot of another pipe, configuring said pipe joint and being inserted to said socket, is configured to be able to engage with the lock ring from the socket inner side,
disengagement of the spigot from the socket is prevented as said lock ring is configured to be able to engage with said accommodating groove,
a tapered surface converging toward the opening side of the socket is formed on at least one of a portion of said lock ring engaging the accommodating groove and a portion of said accommodating groove engaging the lock ring,
when a disengagement prevention force in a pipe axial direction for preventing the spigot from being disengaged from the socket by said engagement is transmitted from the accommodating groove to the lock ring through the tapered surface, a line of action of a component force of said disengagement prevention force in a direction perpendicular to said tapered surface passes the opening side of the socket of a contacting point between a socket bottom end part of the lock ring and the outer periphery of the spigot along the outer surface of the spigot,
the tapered surface is formed on both the portion of the lock ring engaging the accommodating groove and the portion of the accommodating groove engaging the lock ring,
assuming that the width in the pipe axial direction of the inner circumferential surface of the lock ring is t, the height of the lock ring is H, the width in the pipe axial direction of the bottom surface of the accommodating groove is T0, the inclination angle of the tapered surface of the accommodating groove with respect to the pipe axial center is \u03b85, the depth of the accommodating groove is V, the height of the projection is h2, and the dimension of the gap between the inner circumference of the socket and the outer periphery of the spigot is L,
(L+V)\u2212(t\u2212T0)tan \u03b85\u2212H <h2
is satisfied, and
thereby when the lock ring is accommodated in the accommodating groove with said tapered surfaces not facing each other, the tapered surface of the accommodating groove and the outer periphery other than the tapered surface of the lock ring contact and the lock ring is not able to be accommodated up to the bottom side of the accommodating groove, and thus the lock ring protrudes inward in the radial direction from the accommodating groove, the spigot projection contacts said protruding portion when inserting the spigot to the socket, and the spigot is not able to be inserted into the socket.
6. A pipe joint with earthquake-proof function, wherein
a lock ring is accommodated in a lock ring accommodating groove formed at an inner surface of a socket of one pipe configuring said pipe joint,
a projection formed at an outer periphery of a distal end of a spigot of another pipe, configuring said pipe joint and being inserted to said socket, is configured to be able to engage with the lock ring from the socket inner side,
disengagement of the spigot from the socket is prevented as said lock ring is configured to be able to engage with said accommodating groove,
a tapered surface converging toward the opening side of the socket is formed on at least one of a portion of said lock ring engaging the accommodating groove and a portion of said accommodating groove engaging the lock ring,
when a disengagement prevention force in a pipe axial direction for preventing the spigot from being disengaged from the socket by said engagement is transmitted from the accommodating groove to the lock ring through the tapered surface, a line of action of a component force of said disengagement prevention force in a direction perpendicular to said tapered surface passes the opening side of the socket of a contacting point between a socket bottom end part of the lock ring and the outer periphery of the spigot along the outer surface of the spigot,
a sealing material is arranged in a compressed state between the socket and the spigot at the opening side of the socket of the lock ring,
a backup ring that presses against the outer peripheral surface of the spigot is arranged between the inner circumferential surface of the socket and the outer peripheral surface of the spigot at between the sealing material and the lock ring, and
the backup ring includes a small diameter part formed so as to be arranged on the inner side than said inner circumferential surface of the socket, and a large diameter part formed with a greater diameter than the small diameter part and preventing said sealing material in the compressed state from entering a gap between said inner circumferential surface of the socket and said small diameter part.
7. The pipe joint with earthquake-proof function according to claim 6, wherein a maximum outer diameter of the large diameter part is formed greater than the inner diameter of the inner circumferential surface of the socket, and when the backup ring is arranged at a position corresponding to the inner circumferential surface of the socket, a portion of said large diameter part formed greater than the inner diameter of the inner circumferential surface of the socket presses against said inner circumferential surface.
8. The pipe joint with earthquake-proof function according to claim 7, wherein a cut-out part is formed in the backup ring for deforming the large diameter part when the backup ring is arranged at the position corresponding to the inner circumferential surface of the socket.
9. The pipe joint with earthquake-proof function according to claim 7, wherein the backup ring includes a main body part configuring the small diameter part, and a projecting part configuring the large diameter part formed so as to project outward in the pipe diameter direction from the main body part.
10. The pipe joint with earthquake-proof function according to claim 7, wherein the backup ring is formed into a tapered shape from the large diameter part to the small diameter part.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A laser level, comprising:
a foundation (1) with at least one battery provided therein,
a base (2) with at least one laser projection module (3) mounted thereon,
wherein said base (2) and said foundation (1) are connected in a way that allows for 360 degrees rotation of said base relative to said foundation, and wherein one side of said foundation (1) that faces said base (2) is provided with anode and cathode conduction rings (11) that are connected to said battery, and wherein one side of said base (2) that faces said foundation (1) is provided with two contact pieces (21) that connect to said at least one laser projection module (3) and that connect to the anode and cathode conduction rings (11) to provide a conduction-wire-free connection between said laser projection modules (3) and said batteries; and
said laser level further including a columnar cavity in the middle of both said foundation (1) and said base (2), wherein an upper-end shell (22) of said cavity for said base (2) and a lower-end shell (12) of said cavity for said foundation (1) are both made of transparent materials.
2. The laser level of claim 1, wherein the at least one laser projection module includes at least two laser projection modules.
3. The laser level of claim 1, further including a cross scale (13) marked on said lower-end shell (12) of said foundation (1), wherein the crossing point of said cross scale (13) can be superposed with the intersection projection of the counter-extension line of the laser beams emitted by said at least one laser projection module (3).
4. The laser level of claim 1, further including a scale (14) marked on the outer surface of said foundation (1).
5. A laser level device comprising:
a foundation;
a base rotatably mounted to the foundation in a manner that permits 360 degrees of rotation of the base about an axis of rotation;
a laser projection module mounted to the base and adapted to emit at least one laser beam;
a cover mounted to the base and rotatable therewith; and
an elongated cavity providing a line of sight through the foundation, the base, and the cover, wherein the elongated cavity is coincident with the axis of rotation.
6. The device of claim 5 wherein the elongated cavity includes a first transparent surface formed in the foundation and a second transparent surface formed in the base.
7. The device of claim 6 further comprising an actuator disposed within the elongated cavity, and wherein a top surface of the actuator forms the second transparent surface.
8. The device of claim 7 further comprising at least one foot formed on a bottom surface of the foundation, and wherein the at least one foot is movable away from the bottom surface of the foundation upon depression of the actuator into the elongated cavity.
9. The device of claim 8 further comprising adhesive affixed to the at least one foot.
10. The device of claim 6 further comprising a cross scale on the first transparent surface.
11. The device of claim 5 wherein the foundation includes a pair of conductive rings adapted to be electrically coupled to a power source contained in the foundation and wherein the base includes a pair of conductive tabs adapted to slide along the pair of rings, wherein the conductive tabs conduct electrical power from the conductive rings to the laser projection module.
12. The device of claim 11 wherein the power source includes at least one battery.
13. The device of claim 5 further comprising gripping elements mounted to an exterior surface of the cover.
14. The device of claim 5 further comprising at least one bubble vial supported by the base, and wherein the cover includes at least one window aligned with the at least one bubble vial to allow visual inspection of the at least one bubble vial.
15. The device of claim 5 wherein the laser projection module is configured to emit a first laser beam and a second laser beam that is emitted along an axis perpendicular to that of the first laser beam.
16. The device of claim 15 further comprising first and second openings formed in the cover and adapted to allow emission of the first and the second laser beams, respectively, through the cover.
17. The device of claim 16 further comprising markings formed on an exterior surface of the cover, the markings aligned with the first and the second openings such that the markings are co-aligned with the first and second laser beams when said beams are emitted by the laser projection module.
18. The device of claim 5 further comprising a power button extending from the base through the cover and adapted to selectively power the laser projection module when depressed.
19. A laser level device, comprising:
a foundation with at least one battery provided therein,
a base with at least one laser projection module mounted thereon,
wherein said base and said foundation are connected in the way that allows for 360 degrees of rotation of said base relative to said foundation, and wherein one side of said foundation that faces said base is provided with anode and cathode conduction rings that are connected to said battery, and wherein one side of said base that faces said foundation is provided with two contact pieces that connect to said at least one laser projection module and that contact the anode and cathode conduction rings to provide a conduction-wire-free connection between said laser projection modules and said battery; and
a cross scale marked on said foundation, wherein the crossing point of said cross scale can be superposed with the intersection projection of the counter-extension line of the laser beams emitted by said at least one laser projection module.