63results about How to "Full tightness" patented technology

A screw-threaded joint for a steel pipe includes a pin (1) and a box (2). The pin (1) has a tapered male screw thread (11), a tapered seal surface (13), and an end shoulder surface (14), while the box (2) has, in a corresponding manner, a tapered female screw thread (21), a tapered seal surface (23), and a shoulder surface (24). The pin (1) and the box (2) can be easily fastened together, and the screw-threaded joint has improved tightness at seal surfaces. The pin and the box have a contactless region (B) between the seal surfaces (13, 23) and the shoulder surfaces (14, 24), and the peripheral surfaces of the pin and the box do not make contact with each other in the contactless region (B). At least that portion of pin which is in the contactless region and adjacent the front end of the pin is a tapered surface portion (18) having substantially the same inclination angle as the tapered seal surface (13). Also, that portion of the box which is in the contactless region is substantially a circular cylindrical surface.

A bearing roller chain having a seal mechanism preventing entry of foreign substance from the outside, and leaking of lubricating oil leakage to the outside and the like, thereby improving wear resistance of the bearing roller and reducing both the likelihood of rotation failure and the traveling resistance of the chain. The seal mechanism is provided between an inner link plate of the chain and the hollow bearing roller, which has a plurality of internal anti-friction rollers rotatable between the hollow bearing roller and a bush mounted between opposed inner link plates. The seal mechanism encloses the internal anti-friction rollers and comprises two parts, i.e a seal ring having an annular lip portion, which comes into close contact with an outer side surface of the bearing roller and an annular metallic seal member. The metallic seal member forms a labyrinth structure by providing a flange on an outer circumferential portion which loosely enters an annular concave groove in the outer side surface of the bearing roller. The seal mechanism provides a double sealing effect by virtue of the seal ring and the annular metallic seal member.

An extrusion molded article for automobiles, having a body portion (1) and a hollow sealing portion (11), where the body portion (1) comprises a core (2) made of a resin having a U-shaped cross-section extending in a longitudinal direction and a covering layer (3) surrounding and covering the core partly or entirely, and the hollow sealing portion (11) is bonded integrally with an outer surface (4) of the body portion, characterized in that the covering layer (3) is made of a thermoplastic elastomer composition having a tensile elongation at break of at least 350% , as determined according to JIS K6251, and a change in 100% modulus of at most 40%, wherein the change in 100% modulus = [(100% modulus at 23 DEG C - 100 % modulus at 80 DEG C) / 100 % modulus at 23 DEG C ] x 100, and the 100 % modulus is a stress at 100% elongation, as determined according to JIS K6251, and the hollow sealing portion (11) is made of a thermoplastic elastomer composition having a tensile elongation at break of at least 250%, as determined according to JIS K6251, and a compression set of 35% or less, as determined at 25% compression, 70 DEG C, 200 hours.

The invention provides a zipper tape, a packaging bag and a manufacturing method of the packaging bag. One edge portion (224) of a female side band-shaped base (221) on the side of a storage space (15) is made thick to provide a thick portion (31). A cutting portion (32) which is thinner than the female side band-shaped base (221) is provided on the storage space (15) side of the thick portion (31). A sealing base (33) is provided at the storage space (15) side of the cutting portion (32), wherein the sealing base (33) is thicker than the female side band-shaped base (221) and is to be sealed to the inner surface (10A) of a bag body (10) to which a male side band-shaped base (211) is adhered. A sealing strength of the thick portion (31) to the inner surface (10A) on which the male side band-shaped base (211) is adhered is smaller than the seal strength of the sealing base (33). The cutting portion (32) is provided to have a seal strength smaller than the seal strength of the sealing base (33). An area surrounded by the thick portion (31), the cutting portion (32), the sealing base (33), and the inner surface (10A) of the bag body (10) becomes a substantially sealed state, and thus, if a pressure is externally applied to the bag body (10) due to dropping, etc., damage due to extension of the cutting portion (32), etc., can be prevented.

A sealant film which is provided with: a polyolefin layer that contains a polyolefin as a main component; and a polycycloolefin layer that serves as the outermost layer, while containing a polycycloolefin as a main component. The polycycloolefin comprises two or more structural units selected from among a structural unit (A) derived from a dicyclopentadiene compound, a structural unit (B) derivedfrom a tetracyclododecene compound and a structural unit (C) derived from a norbornene compound; and the polycycloolefin has a glass transition temperature of 80 DEG C or less.

This invention provides a valve device. The valve device (1) has: a valve main body (2) that compartmentalizes a valve chamber (21) provided with an NO outflow port (25) and NC outflow port (24) through which a fluid flows; and a valve body (3) that opens / closes the NC outflow port (24) and NO outflow port (25). The valve body (3) includes: a diaphragm (6) disposed in a manner so as to cover the valve chamber (21); and a drive means (4) that, by means of pressing the diaphragm (6), can open / close the NC outflow port (24) and NO outflow port (25). A first valve seat (24b) and second valve seat (25b) are formed at the periphery of the NC outflow port (24) and NO outflow port (25). The diaphragm (6) comprises an elastic material of which the JIS-K6253 durometer A hardness is A50-A85. The pressure of the seated diaphragm (6) to the first valve seat (24b) and second valve seat (25b) is 0.5-1.0 N / mm<2>.

The press (1) has guiding channels provided in press plates (2) for process gases, where the guiding channels are equipped with openings, and through holes are arranged in the press plates. Supply channels run perpendicular to press surfaces through the arrangement of supply channels (33) over tires (3). A connection unit is arranged between the press surfaces of the adjacent press plates, and connections to distribution channels are provided in the through holes of the press plates.

A developing apparatus including a layer thickness adjustment member configured to regulate a layer thickness of a two-component developer carried on a surface of a developing sleeve of a developing roller is disposed so that one end portion in a width direction faces the surface of the developing sleeve at a predetermined interval. At two end portions in a longitudinal direction of the layer thickness adjustment member, a notch open to the one end side in the width direction is provided. Since an amount of conveyance of the developer locally increases at two end portions of the developing sleeve by providing such a notch in the layer thickness adjustment member, density of an ear of a magnetic brush to be formed increases, and it is possible to exhibit the sufficient seal performance and prevent the toner from being scattered.

The invention relates to a vane pump for conveying liquid (especially viscous oil), comprising: a rotor (2) having a sliding groove (23) in which a slidable vane (3) is accommodated and which can be moved relative to the radius of the rotor ( r) indentation; the pump housing (1) with the pump chamber (10) housing the rotor (2); and the inlet (5) and outlet (6) towards at least The end side of the rotor (2) is open into the pump chamber (10); wherein around the circumference of the rotor (2) radial elevations (21) protruding towards the sliding slots (23) form the recesses to the retractable vanes (3) The rotor radius (r) on either side, and at the radially raised portion (21), the radially recessed portion (20) is recessed relative to the rotor radius (r). In the radial elevation (21), on at least one end side of the rotor (2) to which the inlet (5) and the outlet (6) are open, a recess (4) is formed which provides a Rotary servo control geometry for pressure peaks in the small vane chamber.