Patent Application
20130160696
The present invention relates to a pressure gauge, in particular to the pressure gauge used for measuring the pressure of a fluid.
With reference to
However, the aforementioned conventional pressure gauge 1 has the drawback of a relatively large volume which is not suitable for the use in a smaller space, and the way of using the serrated end of the gear disk link rod 13 to drive and rotate the gear shaft 14 in order to turn the indicating needle 15 generally gives a relatively small turning angle (at most up to 90 degrees), so that the precision of the indication is relatively low.
In view of the shortcomings of the prior art, it is a primary objective of the present invention to provide a pressure gauge with a small volume and improve the precision of the indication.
To achieve the aforementioned objective, the present invention provides a pressure gauge comprising: a gauge base rotably disposed on a rotating shaft and a sectored gear disk of the gauge base, an indicating needle coupled to an end of the rotating shaft, and a reed pipe connected to a pressure source, wherein the rotating shaft has an engaging portion engaged with the sectored gear disk for performing a transmission, and the pressure gauge is characterized in that the reed pipe has a lever installed at a movable end of the reed pipe, and the sectored gear disk has a latch hole for latching the corresponding lever, and when an end of the reed pipe is moved by a change of pressure, the lever is linked to the latch hole to rotate the sectored gear disk, so as to drive and turn the indicating needle linked with the rotating shaft.
The aforementioned and other technical contents of the present invention will become apparent with the detailed description of a preferred embodiment together with the illustration of related drawings as follows.
With reference to
The gauge base 21 includes a first support portion 211 and a second support portion 212, and the first support portion 211 is extended linearly in a horizontal direction and disposed at a position penetrating through the central position of the gauge, and the second support portion 212 is coupled to both ends of the first support portion 211 to form a semicircular shape, and the rotating shaft 22 is rotably installed at a mid-point position of the first support portion 211, and the sectored gear disk 23 is rotably installed at a mid-point position of the second support portion 212.
The rotating shaft 22 has an engaging portion 221 disposed thereon, and the engaging portion 221 of the preferred embodiment is a gear used for engaging with a serrated edge of the sectored gear disk 23. In addition, the rotating shaft 22 further includes a coil spring (not shown in the figure) installed thereon for providing a restoring force to resume the rotating shaft 22 (or the indicating needle 24) to its original position.
The reed pipe 25 is substantially in a spiral shape and disposed near the central position for interconnecting a pressure source, and a lever 251 is disposed at the movable end on the outer side, such that when there is pressure, the lever 251 will be moved in a direction away from the center, and the sectored gear disk 23 will drive the lever 251 to pass through and be latched into a latch hole 231. When an end of the reed pipe 25 is moved by a change of pressure, the lever 251 linked with the latch hole 231 drives and rotates the sectored gear disk 23, so as to drive and turn the indicating needle 24 linked with the rotating shaft 22.
With the installation of the aforementioned components, the overall volume is concentrated and reduced. In the meantime, the sectored gear disk 23 is provided for driving the rotating shaft 22, so the range of turning the indicating needle 24 can be increased up to 270 degrees to enhance the precision of the indication significantly.
While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.
