Patent ID: 6095758
Filing Date: 2000-08-01
Classification: F04B

Abstract:
A structure for a compact air compressor, comprising a securing seat, a transmission device, and a compression device, wherein said securing seat is an integrally formed structure having a body which includes a cylindrical receiving slot communicating with a shaft receiving hole at an opposite side, and a pair of fitting tubes for securing screw rods, said receiving slot being provided with two opposite planar portions for receiving a sleeve having a projecting rim with opposite planar portions so as to prevent rotation of said sleeve, said screw rods being screwably locked with a motor having a main gear as a whole after being passed said fitting tubes, an integrally formed compression cylinder being disposed on said securing seat at a suitable position for mounting said compression device, a top end of said compression cylinder being connectably provided with a top tube which is internally provided with a valve block and a spring, said top tube being sealed by a cover urged by said spring to serve as a gas flow control, a guide tube and a threaded tube respectively extending from the body of said top tube, said threaded tube being adapted to screwably connect with a pressure gage as a whole; said transmission device including a weight, a link shaft, and a transmission gear, said weight being centrally formed with a substantially semi-circular shaft hole and having a connecting rod extending from a top end thereof and insertable into a connecting hole of a link of said compression device, said connecting hole having a bushing placed therein to enhance the smoothness of rotation of said connecting rod and reduce friction, one end of said link shaft being provided with an insert portion which is substantially semi-circular, the other end thereof being provided with a fastening groove, said transmission gear being further with a central through hole, and a receiving recess shaped to match said weight, said receiving recess having two shoulders and two retaining blocks being respectively disposed at said shoulders, one half of said transmission gear being provided with a thick toothed surface, with the other half thereof being provided with a thin toothed surface, said link shaft being passed through said shaft receiving hole of said securing seat and said sleeve with projecting rim, an E-shaped fastening clip being utilized to secure said link shaft in said fastening groove, said shaft hole of said weight being insertable into said insert portion of said link shaft to prevent slippage of said weight and said transmission gear from said link shaft, said weight just fitting into said receiving recess, and said retaining blocks at both shoulders of said receiving recess being utilized to position said weight in said transmission gear of two different thicknesses; and said compression device being comprised of a piston container, a compression valve, a compression positioning block, and a link, said piston container being provided with pin holes at a bottom portion thereof to receive bevel pins at the top ends of said link so as to achieve a linking-up structure, said connecting hole being provided in a bottom portion of said link for receiving said bushing and said rod, said link capable of guiding the movement of said piston container by means of the turning of said link shaft, a fastening post extending from the top end of said piston container, and a bevel fastening portion being formed at the top end of said fastening post for fastening both said compression positioning block and said compression valve to prevent their possible slippage, said fastening post being further provided with an air inlet which communicates with said piston container, an insert pin further extending from the top side of said fastening post, a valve piece being disposed on said insert pin and secured in place by a fastening portion of a limiting piece, whereby said sleeve is firstly fitted into said receiving slot of said securing seat, and said link shaft is passed through said shaft receiving hole and said sleeve, then said the weight is fitted into said receiving recess and positioned in place by said retaining blocks, one end of said link shaft being passed in sequence through said through hole of said transmission gear and said shaft hole of said weight by means of said insert portion, said weight and said transmission gear being prevented from slippage from said link shaft by said insert portion and said retaining blocks, the other end of said link shaft being secured to said securing seat by means of said E-shaped fastening ring which engages said fastening groove of said link shaft, said connecting rod of the weight 20 being next passed through said bushing fitted into said connecting hole of said link to allow coupling of said weight and said link, said bevel pins at the top ends of said link being fitted into said pin holes at the bottom portion of said piston container, said main gear driving said transmission gear to guide said link to displace upwardly and downwardly when said motor is actuated, thereby enhancing gas output efficiency.