51results about How to "Good self-sealing" patented technology

A vascular prosthesis having a tubular structure is provided. The tubular structure is fabricated from at least two layers wherein at least one layer includes a thrombogenic agent.

A shaft seal packing exhibiting high sealing ability in initial assembly and also exhibiting, even after the packing is retightened, excellent sealing ability by an increased seal surface pressure obtained through an effect of pressing and by self-sealing ability obtained through an effect of fluid pressure. A valve element installed in a valve body is provided so as to be rotatable about or liftable along a valve shaft. The shaft seal packing is installed in a shaft seal chamber of a valve in which the valve shaft is set. The shaft seal packing is used for a shaft seal structure for the valve, and in the shaft seal packing, annular packing bodies having a generally V-shape cross- section are stacked on each other, the stack surfaces on the inner diameter side are made to be in intimate contact with each other, and a predetermined gap is formed between adjacent stack surfaces on the outer diameter side. In the shaft seal structure, force applied to the packing bodies by tightening force and fluid pressure is converted into radial force by the taper angle of the stack surface on the inner diameter side. This causes the inner peripheral surfaces of the packing bodies on the inner diameter side and the outer peripheral surface of the valve shaft on the sliding side are sealed between each other by surface contact, and also the gaps allow lip parts on the outer diameter side to be pushed and expanded, causing the lip parts and the shaft seal chamber on the fixed side to be sealed between each other by line contact.

The present invention provides sintered porous plastic plugs for use in filtered serological pipettes which facilitate manufacture or assembly of the filtered serological pipettes. In one embodiment, a sintered porous plastic plug of the present invention comprises plastic and a cylindrical body, a first end and a second end, the first end having a cross-sectional area less than the cross-sectional area of the cylindrical body, and the second end having a cross-sectional area less than the cross-sectional area of the cylindrical body.

The invention discloses a waterproof sealing structure for port connection, comprising a casing (1) having a socket terminal hole (12); a socket (2) installed on the casing (1) having a socket terminal (22), the socket terminal (22) passing through the socket terminal hole (12) on the casing (1), further comprising a sealing piece (3); middle of the sealing piece (3) is definitely formed with a first opening hole (36) passing through the socket terminal (22); and two end faces of the sealing piece (3) are continuous sealing faces; one end face is joined with the casing; the other end face is joined with the relative sealing contact surface (511) on the plug body (51) of the plug (5). The invention further discloses a notebook PC. The invention can realizes the waterproof sealing when using the port; the invention has simple structure, little size and can easily realize thin design without changing the port structure of the existed apparatus.

The invention discloses a tool changer door used for a machining center. A cylinder and guide rails are fixedly arranged on a machine tool guard; the cylinder and a connecting plate are hinged; the connecting plate is fixedly arranged on a prevention plate; the protection plate is fixedly connected with the lower ends of hinges and guide rail sliding seats; a stop dog is fixedly arranged on the tool changer door via a support; a bearing support is fixedly arranged on the machine tool guard; a bearing is fixedly arranged on the bearing support via a hinge pin; the upper ends of the hinges are fixed with the tool changer door; the upper ends of the hinges and the lower ends of the hinges are respectively hinged to long plates; one end of a spring is connected with the tool changer door, and the other end of the spring is connected with the protection plate. The left side and the right side of the tool changer door are provided with turnups at the angle of 45 degrees. The tool changer door used for the machining center has the advantages of simple structure, small noise and good self-sealing performance and is suitable for a small machining center with a limited space, and meanwhile, tool changing time is greatly shortened.