Patent ID: 7188405
Filing Date: 2007-03-13
Classification: H01R,H05K,Y10T

Abstract:
1. A pin removal structure used in a printed circuit board drilling machine comprised of: a main body having a cylindrical recess disposed in one end, an upper and lower aligned first channel and second channel at an opposite end, a connective bore in communication between the first and second channels, air passages proximal to an upper reach of the first channel and a lower reach of the second channel and, furthermore, which are in communication with the cylindrical recess proximal to an upper end thereof; additionally, air passages respectively disposed proximal to the upper end, lower end, and middle section position of the cylindrical recess, wherein an air intake tube merges with an air passage proximal to a middle section thereof; a first driving member slideably disposed in first channel of the main body having a first airtight sealing ring around a circumferential surface thereof that is postured against the first channel; an upper mounting cover snap fitted on a lock ring at the upper end of the said main body first channel having a second airtight sealing ring around a circumferential surface thereof for a hermetic seal; an outer cover that is fastened over the exterior end of the upper mounting cover; a second driving member slideably disposed in the second channel of the main body having a third airtight sealing ring around its circumferential surface for a hermetic seal; a lower mounting cover snap fitted by means of a lock ring onto the lower end of the second channel of the main body having a fourth airtight sealing ring around its circumferential surface for a hermetic seal; a socket fastened to a center of the lower mounting cover having a puller sleeve disposed in a middle of the front end; a first driving rod coupled to a center of the said first driving member and equipped with a fifth airtight sealing ring that is inserted in an airtight state into the connective bore to penetrate the first and second channel of the main body, a center hole of the second driving member, and a center hole of the lower mounting cover; a collet member inserted into a center hole of the lower mounting cover socket, a rear end of which is fastened by a screw to a second driving rod that has a center pinch hole as well as a push-pull neck disposed proximal to a front end of a circumferential surface thereof, the push-pull neck fitting into the puller sleeve of the socket, and slots are disposed between the circumferential surface and the center pinch hole, enabling an entirety of the push-pull neck to have an elastic constrictive and expansive capability; a plurality of second driving rods evenly arrayed at four points around the collet member that are each equipped with a sixth airtight sealing ring and inserted under airtight conditions at the lower mounting cover and fastened to the second driving member; an air pressure control valve member installed in the main body cylindrical recess that has a lower mounting member, an inferior end of which is fastened airtight to a bottom end of the cylindrical recess; a seventh airtight sealing ring being positioned proximal to a superior end thereof to maintain airtightness with the cylindrical recess; slightly smaller paths being above and below the seventh airtight sealing ring such that an upper vent duct and a lower vent duct are respectively formed between the seventh sealing ring and the said cylindrical recess; a first horizontal connective hole being disposed proximal to a lower extent of the seventh airtight sealing ring, the first horizontal connective hole maintaining communication with the air passage at a lower end of the cylindrical recess and, furthermore, having a centrally disposed sleeve hole; an elastic component nested in the lower mounting member center sleeve hole; an upper mounting member; an upper end of which is fastened airtight to the upper end of the cylindrical recess, with an eighth airtight sealing ring positioned proximal to the lower end to maintain airtightness with the cylindrical recess, slightly smaller paths at an upper extent and a lower extent of the eighth airtight sealing ring respectively form an upper vent duct and a lower vent duct between the eighth airtight sealing ring and the said cylindrical recess, and a second horizontal connective hole disposed proximal to the upper extent of the eighth airtight sealing ring, the second horizontal connective hole maintaining communication with the air passage at the upper end of the cylindrical recess; a control rod respectively inserted in a center hole of the upper and lower mounting members; a bottom extremity of which is against the elastic component and thereby elastically loading the control rod, the control rod having a vent slot proximal to a lower end of a circumferential surface thereof; the vent slot being in communication with the air passage at the middle section of the cylindrical recess, enabling respective communication with the air passages of the main body first channel during ascending and descending movement, with a small path disposed proximal to an upper end of the vent slot forming an air admission duct between the air passage and the center hole of the upper mounting member; the air admission duct ascending and descending with the said control rod, and enabling communication between the second horizontal connective hole and the air passage confluent with the main body first channel; and a knob installed at a top extremity of the control rod that is pressed to articulate the ascending and descending of the control rod; a handle installed at one side of the main body that provides for carrying and serves as an air intake tube; a speed adjustment shaft installed on the main body and inserted into communication with a lower reach of the first channel and the air passage positions between an upper reach of the second channel and the cylindrical recess that enables control over air flow volume.