1149results about How to "Reduce contact surface" patented technology

A gun assembly for perforating wells comprising a plurality of guns with shape charges aligned centrically by end caps having insulated connector pins for conducting electrical signals and pressure through the end caps while preventing debris from the blast of one gun from entering and damaging the electrical connections and components of the next gun. The end caps being interconnected physically and electrically by specialized intermediate subs.

The invention relates to a multifunctional stirring machine which consists of a rotatable vertical cylindrical container and a stirrer capable of rotating in reverse direction in the container. The structural design that a rotating shaft center of the container and the rotating shaft center of the stirrer are eccentric and a scraper mechanism which is specially arranged can ensure that the multifunctional stirring machine has no stirring dead angles during the work, and an electrical material level automatic control device can ensure the discharge flow of materials by relying on the self-gravity and simultaneously maintain the stable material level in the container. The multifunctional stirring machine can have a plurality of functions of mixing, peeling, clearing, polishing, dampening andthe like by being matched with stirring rods with different structures. When the multifunctional stirring machine is used as a mixing machine, the multifunctional stirring machine has the advantagesof simple structure, low cost, fast mixing speed, high mixing uniformity, small segregation tendency, low energy consumption, simple use and maintenance, long service life and the like. When the multifunctional stirring machine is used as a peeling machine, a clearing machine or a polishing machine, the multifunctional stirring machine has the advantages of high peeling efficiency or good clearingeffect, no production of crushed particles, low energy consumption and the like. When the multifunctional stirring machine is used as a dampening machine, the multifunctional stirring machine has theadvantages of uniform dampening, low energy consumption and the like.

Clasp comprising a cover connected to a first bracelet strand and to a second bracelet strand, a connecting means being inserted between the second bracelet strand and the cover of the clasp, the connecting means comprising an end link sliding between a first position in which it is engaged in the cover of the clasp, and a second position in which it is outside the cover of the clasp, the end link comprising a push-button which causes a toothed element to change from a first position, in which the toothed element is in mesh with a rack toothing, to a second position, in which the toothed element is released, the end link being provided with an arresting means preventing the removal of the end link from the cover of the clasp, the arresting means comprising at least one lug, which projects into a groove arranged in the bottom of the cover and which defines two end stop members.

A heat treatment jig by the invention comprising: the diameter of a disk-type structure being 60% or more of that of loaded semiconductor wafers; the thickness being 1.0 mm or more but 10 mm or less; the surface roughness Ra of 0.1 μm or more but 100 μm or less at a contacting surface with the wafers; and the surface planarity being specifically controlled in the concentric direction as well as in the diametrical direction, otherwise in place of above planarity, comprising a controlled maximum height in such a way that the maximum height is obtained by the flatness measurement at the multiple positions and the difference between said maximum height and the hypothetical-average-height-plane thus set is 50 μm or less, can reduce the slip generation due to the close adhesion of the wafers and the jig. Owing to this, even if the wafers having large tare weight should be heat-treated, the slip generation can be effectively prevented, thus enabling the jig to be widely used as the reliable heat treatment jig for semiconductor substrates.

A mount for an electric motor, the mount comprising a sleeve for receiving a motor, the sleeve having a longitudinal axis extending between a first end and a second end, wherein the first end comprises a plurality of plurality of projections and the plurality of projections extend along the longitudinal axis. The sleeve may receive the motor via the first end or the second end. The plurality of projections may be spaced around a circumference of the sleeve. The plurality of projections may comprise a pattern of substantially constant frequency around the sleeve. The plurality of projections may be substantially V-shaped with the point extending along the longitudinal axis from the first end of the sleeve.

The invention relates to a split type gas displacement type underground water sampler which comprises a sample containing pipe, an inflation and deflation unit and a water acquirement pipeline; the inflation and deflation unit comprises an air source, an air pipe and an air pressure controller, the upper end of the sample containing pipe is communicated with the inflation and deflation unit, and the water acquirement pipeline comprises a water outlet pipe. The underground water sampler also comprises a sampling unit, wherein the sampling unit comprises a water outlet non-return valve, a tee and a water inlet non-return valve which are sequentially communicated from top to bottom; the water acquirement pipeline also comprises a hose which is communicated with the lower end of the sample containing pipe and a middle outlet of the tee, and the water outlet non-return valve is communicated with the water outlet pipe. The invention solves the technical problems of large disturbance of underground water, existence of a gas spilling phenomenon and the like during sampling. The invention realizes the sampling of the underground water under the conditions of low air pressure and small gas quantity and has the advantage of high sampling efficiency.

The invention discloses vacuum negative-pressure casting method for sop plastic mould cast, which comprises steps: fix the mould on pull box, heat and cover the plastic membrane on the mould, spray coating layer on membrane surface, put casting box covered with seal membrane, take vacuum treatment for casting box to harden its surface; then, draw mould, obtain and combine upper-down cavity, cast on the casting gate, demould to get the cast. This technique is simple, easy to operate; the product has high intensity, high precision size and easy to demould.

A flexible busbar includes a central conductor (generally of rectangular cross section comprising multiple layers of thin aluminum, copper or other alloys with good electrical properties (conductivity)) and a sleeve having a shape on the internal surface to reduce the adhesion between the two conductors and the sleeve when the flexible busbar is bent, folded, or twisted. This increases the flexibility of the flexible busbar.