Control shaft for ceramic control valve of faucet

[0001] 1. Field of the Invention

[0002] The present invention primarily relates to a control shaft, and more particularly to a control shaft for a ceramic control valve of a faucet, wherein the control shaft is operated easily and conveniently, thereby facilitating a user operating the faucet.

[0003] 2. Description of the Related Art

[0004] A conventional faucet comprises a main body, a valve seat mounted in the main body, a control shaft having a lower end mounted on the valve seat, and a handle mounted on an upper end of the control shaft. The lower end of the control shaft is formed with a spherical ball close fit in the valve seat. However, the spherical ball of the control shaft is in contact with the valve seat closely and entirely, thereby increasing the friction between the spherical ball of the control shaft and the valve seat, so that the control shaft is not operated smoothly. In addition, impurities are easily accumulated between the spherical ball of the control shaft and the valve seat during a long-term utilization, so that the control shaft is not operated easily and conveniently, thereby causing inconvenience to a user when operating the faucet.

[0005] The primary objective of the present invention is to provide a control shaft for a ceramic control valve of a faucet, wherein the control shaft is operated easily and conveniently, thereby facilitating a user operating the faucet.

[0006] Another objective of the present invention is to provide a control shaft for a ceramic control valve of a faucet, wherein the flattened faces are formed on the peripheral wall of the drive member of the control shaft to reduce the friction between the drive member of the control shaft and the inner wall of the inner barrel, so that the control shaft is operated easily and conveniently, thereby facilitating a user operating the control shaft of the control valve.

[0007] A further objective of the present invention is to provide a control shaft for a ceramic control valve of a faucet, wherein the control shaft is operated smoothly, so that the control shaft is not easily deformed during a long-term utilization, thereby enhancing the lifetime of the control shaft and the control valve.

[0008] In accordance with the present invention, there is provided a control valve of a faucet, comprising:

• • [0009] a base having an inside formed with a water outlet;
  • [0010] a lower ceramic block mounted on the base and having an inside formed with a conducting channel, a cold water inlet and a hot water inlet;
  • [0011] an upper ceramic block mounted on the lower ceramic block and having an inside formed with a conducting opening;
  • [0012] a coupling block mounted on the upper ceramic block;
  • [0013] a bottom bushing mounted on the coupling block;
  • [0014] an inner barrel mounted on the bottom bushing and having an inner wall formed with a through hole;
  • [0015] a housing mounted on the base and enclosed around the inner barrel; and
  • [0016] a control shaft mounted in the inner barrel and having an upper end protruding outward from the through hole of the inner barrel, wherein:
  • [0017] the control shaft has a lower end formed with a drive member rested on the inner wall of the inner barrel; and
  • [0018] the drive member of the control shaft has a peripheral wall formed with a plurality of flattened faces.

[0019] Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

[0025] Referring to the drawings and initially to FIGS. 1–4, a control valve 2 of a faucet in accordance with the preferred embodiment of the present invention comprises a base 28 having an inside formed with a water outlet 30 and having a top face and a bottom face each provided with a seal gasket 29, a lower ceramic block 27 mounted on the top face of the base 28 and having an inside formed with a conducting channel 273, a cold water inlet 271 and a hot water inlet 272, an upper ceramic block 26 mounted on the lower ceramic block 27 and having an inside formed with a conducting opening 261, a coupling block 25 mounted on the upper ceramic block 26, a bottom bushing 24 mounted on the coupling block 25, an inner barrel 23 mounted on the bottom bushing 24 and having an inner wall formed with a through hole 231, a housing 22 mounted on the base 28 and enclosed around the inner barrel 23, and a control shaft 21 mounted in the inner barrel 23 and having an upper end 211 protruding outward from the through hole 231 of the inner barrel 23 to combine with a handle (not shown) of the faucet.

[0026] The control shaft 21 has a lower end formed with a drive member 212 close fit on the inner wall of the inner barrel 23 to rotate the inner barrel 23. Preferably, the drive member 212 of the control shaft 21 has a spherical shape.

[0027] As shown in FIG. 5, the drive member 212 of the control shaft 21 has a peripheral wall formed with a plurality of flattened faces 213 which are equally spaced from each other and are arranged in a staggered manner. Thus, by provision of the flattened faces 213 on the peripheral wall of the drive member 212 of the control shaft 21, the contacting and rubbing area between the drive member 212 of the control shaft 21 and the inner wall of the inner barrel 23 is greatly reduced, so that the control shaft 21 is operated easily and conveniently, thereby facilitating a user operating the control shaft 21 of the control valve 2.

[0028] As shown in FIGS. 4 and 5, the control valve 2 further comprises a positioning pin 215 having a first end inserted into either one of the flattened faces 213 of the drive member 212 of the control shaft 21 and a second end inserted into the inner wall of the inner barrel 23 to secure the drive member 212 of the control shaft 21 in the inner barrel 23. Preferably, either one of the flattened faces 213 of the drive member 212 of the control shaft 21 is formed with a positioning hole 214, and the first end of the positioning pin 215 is inserted into the positioning hole 214. In addition, the inner wall of the inner barrel 23 is formed with a positioning recess 232, and the second end of the positioning pin 215 is inserted into the positioning recess 232.

[0029] In practice, the control valve 2 is mounted in the faucet, with the upper end 211 of the control shaft 21 being combined with the handle of the faucet. When the handle of the faucet is rotated to open the water flow, the upper ceramic block 26 is rotated and the conducting opening 261 of the upper ceramic block 26 is gradually moved to align with the cold water inlet 271 and the hot water inlet 272 of the lower ceramic block 27 in a staggered manner, so that the mixed water flow of the cold and hot water from the cold water inlet 271 and the hot water inlet 272 of the lower ceramic block 27 in turn flows through the conducting channel 273 of the lower ceramic block 27 and the water outlet 30 of the base 28 and flows outward from the faucet for use by a user.

[0030] Alternatively, when the handle of the faucet is rotated to close the water flow, the upper ceramic block 26 is rotated to interrupt the connection between the conducting opening 261 of the upper ceramic block 26 and the cold water inlet 271 and the hot water inlet 272 of the lower ceramic block 27, thereby stopping the water flow from the faucet.

[0031] Accordingly, the flattened faces 213 are formed on the peripheral wall of the drive member 212 of the control shaft 21 to reduce the friction between the drive member 212 of the control shaft 21 and the inner wall of the inner barrel 23, so that the control shaft 21 is operated easily and conveniently, thereby facilitating a user operating the control shaft 21 of the control valve 2. In addition, the control shaft 21 is operated smoothly, so that the control shaft 21 is not easily deformed during a long-term utilization, thereby enhancing the lifetime of the control shaft 21 and the control valve 2.

[0032] Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.