31results about How to "Maintain roundness" patented technology

In one aspect, the invention relates to a pipette tip mounting shaft configuration and a disposable pipette tip having a matching configuration. The mounting shaft includes a locking section located above a lower sealing section. The locking section has outwardly extending locking lobes located above a stop member and a lower sealing section located below the stop member. In certain embodiments, the diameter of the mounting shaft below the stop member is reduced in order to lessen insertion and ejection forces, which is particularly helpful for hand-held multi-channel pipettors. In these embodiments, the lower sealing section contains either a frustoconical sealing section, or an annular groove and a sealing ring, such as a flouroelastomeric O-ring seal. When the mounting shaft is fully inserted into the collar of the mating disposable pipette tip, the tip locks onto the mounting shaft. The bore of the pipette tip includes a circumferential shelf or shoulder separating its upper collar from the tip sealing area which is located below the circumferential shelf. The tip collar preferably includes a locking ring located at or near the upper opening for the mounting shaft. The dimensions of the collar, and in particular the distance between its circumferential shelf and the locking ring, are selected to match the dimensions of the mounting shaft between the stop member and the upper end of the locking lobes, thus locking the pipette tip in a secure, reliable position and orientation while using ergonomic insertion and ejection forces. The locking lobes preferably include a ramp portion that gently flexes and distorts the pipette tip collar out of round as the mounting shaft is inserted in the pipette tip, rather than stretching the tip collar. The circumferential shelf on the pipette tip between the tip collar and the barrel isolates the sealing area at the upper end of the barrel from distortion, thus facilitating reliable sealing engagement between the lower sealing section of the mounting shaft and the sealing ring in the upper end of the barrel of the pipette tip.

Even when a radial length of a swing arm is increased, no gap is generated between adjacent segments, and tires of various sizes can be handled while roundness of a drum is maintained. An expandable molding drum has a plurality of segments constituting a circumferential surface, the molding drum having a plurality of swing arms having one end portion swingably connected to an outer circumferential surface of a cylindrical slider externally fitted with a drum shaft and having the other end portion swingably connected to the segment and expanding / contracting the segment along with movement of the slider in a drum shaft direction, and adjacent end portions of one end portions of the swing arms being swingably connected to the outer circumferential surface of the slider at intervals from each other in the drum shaft direction.

Groove holes capable of positioning each of the segment cores with respect to a winding jig in an arc attitude with wide gaps between the teeth edges of respective pole teeth are respectively formed in yoke parts positioned at both end parts of each of the segment cores in a longitudinal direction.

The invention discloses a high-tensile signal transmission reel cable, which comprises a cable body, the cable body contains soft steel wires, a copper wire braid layer and an insulating layer, the copper wire braid layer is provided with soft steel wires, and the copper wire braid The outer surface of the inner layer is covered with an insulating layer, and the outer surface of the cable body is covered with an inner lining layer, and hemp rope is filled between the inner lining layer and the cable body, and the outer side of the inner lining layer is wrapped with a shielding layer, so The inside of the shielding layer is provided with a drain wire, the outer surface of the shielding layer is covered with an outer protective cover, and the outer surface of the outer protective cover is provided with a steel wire braided layer; the insulating layer is made of a highly flexible flame-retardant PVC insulating material, On the premise of ensuring the excellent electrical insulation performance of the cable, the heat resistance, flexibility, flame retardancy and mechanical properties of the cable are guaranteed; the cable in the present invention has good flexibility, tensile resistance and mechanical properties, and can withstand large tensile forces and bend.

Even when a radial length of a swing arm is increased, no gap is generated between adjacent segments, and tires of various sizes can be handled while roundness of a drum is maintained. An expandable molding drum has a plurality of segments constituting a circumferential surface, the molding drum having a plurality of swing arms having one end portion swingably connected to an outer circumferential surface of a cylindrical slider externally fitted with a drum shaft and having the other end portion swingably connected to the segment and expanding / contracting the segment along with movement of the slider in a drum shaft direction, and adjacent end portions of one end portions of the swing arms being swingably connected to the outer circumferential surface of the slider at intervals from each other in the drum shaft direction.

The utility model relates to an unreeling device in a copper tube, which comprises a bottom wheel supporting rack (1), a horn mould (2), a connecting plate (3), a wire passing mould (4), an upper guide wheel (5), a lower guide wheel (6) and a base (7). The connecting plate (3) is disposed between the horn mould (2) and the wire passing mould (4). A flange guide structure on the head in the coppertube is employed in the unreeling device, so that floor area is reduced, and two wire plates can be placed at the same time; and a connector can be made in advance, so that a break will not be causedin the process of replacing the wire plates, and continuous production is ensured, thereby improving working efficiency of the whole production line. The unreeling device is simple in manufacturing process, low in cost, high in production efficiency and more reliable in quality of product.

A chain tensioner includes a cylinder having a closed end, an internally threaded plunger axially slidable in the cylinder, a return spring biasing the plunger in the protruding direction from the cylinder, and a screw rod having an external thread in threaded engagement with the internal thread of the plunger. The portion of the screw rod protruding from the plunger abuts a rod seat provided in the cylinder. The screw rod has a rolled external thread and an intermediate portion protruding from the plunger and having an outer diameter smaller than the diameter of the root of the external thread. The screw rod has a forged contact surface, to be contacted with the rod seat, on the axial end face of the intermediate portion. The internal thread may be formed by pressing, and a pressed recess, corresponding to the internal thread, may be formed on the plunger's outer circumference.