Patent ID: 7182310
Filing Date: 2007-02-27
Classification: F16K

Abstract:
1. A position return device for an open and close apparatus, comprising: a casing base, providing a rectangular main member with a hollow seat member on top of the rectangular main member, the main member having a first through hole, which is divided into a right hole section, a middle hole section and a left hole section along an axial direction of the first through hole with a support plate being disposed in the axial through hole at the lower wall surface of the middle hole section and a bearing fitting with the right hole section and the left hole section respectively, a through threaded hole being disposed at a rear side of the main member to communicate with the middle hole section, a second through hole being disposed at a bottom wall of the hollow seat member to communicate with the middle hole section, a fitting hole being disposed at the support plate to pierce a bottom side of the main member to correspond to the second through hole, a first circular plate member being fixedly attached to the bottom wall of the hollow seat member, a second circular plate member being fixedly attached to an open upper side of the hollow seat, and a speed reduction gear set, which provides being disposed in side the hollow seat; a first actuating member, having a first disk part and a first block member extending from a side of the disk part with a first rack provided at the first block member, and being inserted into the first through hole from a right side of the main member to allow the first disk part fitting with the first bearing; a second actuating member, having a second disk part and a second block member extending from a side of the second block member with a second rack provided at the second block member, and being inserted into the first through hole from a left side of the main member to allow the second disk part fitting with the second bearing; a first end cover, being fixedly attached to the right side of the main member to block an end of the first through hole and providing a plurality of first elastic members extending to the first actuating member to press and hold the first actuating at a first preset position; a second end cover, being fixedly attached to the left side of the main member to block an end of the second hole and providing a plurality of second elastic members extending to the second actuating member to press and hold the second actuating at a second preset position; an output shaft, having a joining part at an end thereof to movably connect with the fitting hole of the main member for being attached to a valve or any other close device, providing a pinion next to the joining part to mesh with the first rack and the second rack respectively, having a first cam with an arc surface being disposed next to the pinion, having a gear at the middle section thereof to be disposed in the hollow seat and to mesh with the speed reduction gear set, having a second cam with a flat surface being disposed above the second circular plate; a micro switch, being disposed on the second circular plate next to the second cam; and a motor with a motor shaft, being fixedly mounted to the second circular plate upper plate member with an end of the motor shaft being attached with a driving gear of the speed reduction gear set and another end of the motor shaft extending upward a rod part, which is fixedly attached with an electric magnet, surrounded with a spring secured with a stationary disk at an end thereof, the stationary disk having three locating holes equidistantly spacing apart from each other, a movable disk being disposed under the stationary disk and biased against the spring and providing three equidistant sticks corresponding to and inserting into the locating holes.