903 results about "Small caliber" patented technology

A firearm, in particular a self-loading small-caliber rifle, having a barrel, a breech housing having a breech held in it, with the breech and / or the breech housing being designed such that the firearm can be changed from a first assembled arrangement, which is suitable for right-handed gunners, to a second assembled arrangement which is suitable for left-handed gunners, with the firearm preferably being in the form of a rifle of the Bullpup type.

The invention discloses a small-caliber silk fibroin tubular material and a preparation method thereof and belongs to the field of biomedical materials. The tubular material consists of three layers of materials which are firmly jointed, wherein an outer layer is a tubular electrostatic spinning silk net; a middle layer is a netlike pipe formed by weaving bright silk prepared from degummed silk; and an inner layer is a silk porous material. After the processes of soaking, drying, curing and the like in silk solution, the three layers of the material are firmly jointed, and the inner layer is treated by using anti-coagulation medicaments such as heparin and the like so that the material has coagulation resistance; and the tubular material obtained by using a forming die consisting of a cylindrical intermediate (1), a hollow cylinder (2) and a round base (3) has the inner diameter of between 1 and 8 millimeters, the thickness of between 0.2 and 2 millimeters, high mechanical property, biocompatibility, coagulation resistance and capability of repairing tissues such as blood vessels, nerves and the like.

The present invention discloses a convex aspheric surface reflector surface shape detection device and method which can detect a convex aspheric surface reflector of a large caliber (the caliber is more than 200 mm) by using a CGH compensator of a small size on the condition of guaranteeing the detection precision. The device of the present invention converges the light beams via a lens, so that the caliber of the adopted CGH compensator is very small, and the CGH compensator can realize the high-precision detection of the surface shape of the convex aspheric surface reflector of the large caliber within a high-precision processing size range. The method of the present invention is characterized by combining the phase difference compensation effect of the CGH compensator to the wavefrontsand the convergence effect of the lens to the light beams and using the CGH compensator of the small size to detect the convex aspheric surface reflector of the large caliber, solves the problems thata conventional CGH compensation detection method only can detect the surface shape of the convex aspheric surface reflector of the small caliber, and can detect the convex aspheric surface reflectorsof various curved surface types by being compared with the conventional convex aspheric surface reflector surface shape detection method.

Pistols and methods of manufacture are provided. A representative pistol includes a slide, at least part of the slide being made of plastic; wherein the pistol is a small caliber pistol or pistol for low-impulse ammunition or training pistol. A representative method for manufacturing a pistol includes: forming a slide of the pistol, with at least part of the slide being made of plastic; wherein the pistol is a small caliber pistol or pistol for low-impulse ammunition or training pistol.

A conversion kit for converting a semi-automatic or self-loading handgun of a certain caliber, such as a Colt .45, is modified to allow the use therein of cartridges of a different, usually smaller caliber, thus to allow less expensive training on the handgun, wherein only the barrel and magazine need to be replaced, the barrel having thereon a sliding extractor that cooperates with the original slide in the ejection and reloading of cartridges, and an off-axis bore adjusted to compensate for the difference in the reloading mechanism and the lesser rise of the handgun when firing the lower caliber ammunition, thereby allowing retention of the sighting, safety features, and mechanical functions of the original handgun while closely duplicating the original weight.

A non-spinning projectile that is self-guided to a laser designated target and is configured to be fired from a small caliber smooth bore gun barrel has an optical sensor mounted in the nose of the projectile, a counterbalancing mass portion near the fore end of the projectile and a hollow tapered body mounted aft of the counterbalancing mass. Stabilizing strakes are mounted to and extend outward from the tapered body with control fins located at the aft end of the strakes. Guidance and control electronics and electromagnetic actuators for operating the control fins are located within the tapered body section. Output from the optical sensor is processed by the guidance and control electronics to produce command signals for the electromagnetic actuators. A guidance control algorithm incorporating non-proportional, “bang-bang” control is used to steer the projectile to the target.

A polarization precision calibrating system of a polarity spectrometer comprises an integrating sphere, a collimator tube, a diaphragm, an interference absorber, a polarization state generator (PSG), a polarization-preserving diffuser, a collimating lens, a polarization state detector, a reference light intensity probe and a computer. The calibrating system adopts the integrating sphere, the collimator tube, the diaphragm, the interference absorber and the polarization state generator (PSG) to generate standard polarization calibration sources; and a zero vision field and a small-caliber parallel light beam generated by the calibration sources are expanded into a full vision field and a large-caliber parallel light beam with the same polarization state, so as to carry out full vision calibration to the large-caliber polarity spectrometer. The invention has a capacity of carrying out the full vision polarization calibration to the large-caliber polarity spectrometer, adopts a unequally accurate least square principle to process data during the calibration process, and greatly improves the polarization calibration accuracy of an imaging polarity spectrometer.

A magazine adapter includes a base that is structured to fit within the magazine well of a firearm, and to accept a magazine designed for smaller caliber ammunition than the original firearm. The adapter includes a bolt catch actuator slidably mounted therein. Magazines for which the adapter is intended include an upwardly extending rear projection of the follower, projecting from an opening in the rear of the magazine housing when the follower is in an upper portion of the magazine. When the upwardly extending projection pushes upward on the bolt catch actuator, the bolt catch is actuated, holding the firearms bolt in a rearward position. The magazine adapter thereby facilitates use of the original firearm controls with a caliber conversion unit, or with an upper receiver and barrel combination of a different caliber.

The invention discloses a compressor piston for balancing the reciprocating motion inertia force, and relates to the field of compressors. The compression piston comprises a piston body; two symmetricscrew holes are formed in the upper end surface of the piston body; six thread holes are formed in the lower end surface of the piston body; the thread holes are perpendicular to the lower end surface of the piston body; the thread holes are of counter bore structures, and comprise small-diameter thread holes and large-diameter thread holes; and the thread holes are distributed as an annular array with the circle centers of through holes in the upper and lower end surfaces of the piston body as basal points. The small-diameter thread holes are filled with such high-density substances as lead,and are sealed by using screw plugs and the large-diameter thread holes, so that small-caliber high-pressure pistons and large-caliber low-pressure pistons are balanced in mass.

The invention relates to a method for manufacturing a stainless steel heat transfer pipe, in particular to a method for manufacturing a stainless steel heat transfer pipe of a nuclear heat exchanger, comprising the following steps: cold rolling a material pipe to a middle parison pipe having the required pipe outside diameter and wall thickness through a cold rolling device; cold drawing the middle parison pipe to a middle semi-finished product pipe having the required pipe outside diameter and wall thickness through a cold-drawing pipe, and applying a low-frequency alternating magnetic field with a magnetic field frequency of 10-30Hz and a power range of 20-40kW; cold rolling the middle semi-finished product pipe to a finished product straight pipe having the required pipe outside diameter and wall thickness, and applying high-frequency alternating magnetic field with a magnetic field frequency of 30-50Hz and a power range of 70-90kW; performing multiple wiping inside the finished-product straight pipe, deoiling and cleaning; and performing brightness thermal processing and straightening processing. The stainless steel heat transfer pipe of the nuclear heat exchanger produced with a production technique has the characteristics of small caliber, thin wall, high precision, and the like and accords with the using requirement of high-pressure resistance and corrosion resistance of the nuclear heat exchanger in performance.

The invention provides a device and method for illuminating a body surface. A light source is optically coupled to the proximal end of a light guide and a light scatterer is optically coupled to the distal end of the light guide. The device includes a deployment mechanism that is configured to bring the light scatterer from a small caliber configuration in which the light scatterer is delivered to the body surface to a large caliber configuration in which the light scatterer irradiates the body surface. The invention may be used, for example, irradiate the periadventitial surface of an aneurysmal blood vessel.

The invention provides a degradable expandable local urine tract intracavity support system to effectively support a local lesion urine tract after urine tract stricture obstruction surgery and to prevent stricture obstruction replase due to postoperation scar hyperplasia and contracture. The support system is made of degradable material and can be degraded after scar stability and before adhesive lithogenesis formation and can be discharged with urine outside the body; and the support system comprises but is not confined to a naked rack, a drug eluting stent or a drug coating layer rack, a film covering rack, etc. The support is compressed into an exotheca with small caliber and then released after reaching a target urine tract position, then expanded and enlarged to support the lesion urine tract; the internal diameter and length of the support can be adjusted according to clinic demands; and compared with traditional double J type ureter racks and catheters, interference and damage to normal urine tract except for the stricture part can be avoided, and limitation of rack lumen inner diameter by the urine tract physiological stricture part can be avoided.

The invention relates to a fuze rotary demounting device for small-caliber aircraft projectiles and belongs to an automatic demounting line for the small-caliber aircraft projectiles. The fuze rotary demounting device comprises a rotary demounting power head, a projectile positioning clamping mechanism, a positioning lifting slide table, a fuze-moving-out mechanical arm, a counter weight mechanism and a rack. A hydraulic floating jaw and a spring seat are used for solve the key technical problem of fuze streamline conical surface clamping, reliable projectile positioning is guaranteed by the shape-following design of the cartridge jaw, and safe and reliable operation of the device is guaranteed by the clamping force for hydraulic clamping a fuze and a battle part. A rotary demounting separating end falls by the aid of the axial force and self weight, rotary demounting is performed according to screw pitch, and disordered fastening is avoided. By the fuze rotary demounting device, safe, fast and automatic fuze rotary demounting is achieved through electric, gas and liquid linkage control, automatic demounting of the small-caliber aircraft projectiles is achieved, and good technical support is provided for retired ammunition demounting.

The invention relates to a preparation method of a small-caliber intravascular stent of a three-layer structure. The intravascular stent comprises an inner layer, a middle layer and an outer layer which are sequentially arrayed and tightly attached from inside to outside. The inner layer is a tubular support formed by fiber prepared through an electrospinning method, the middle layer is a tubular support formed by a porous structure prepared through a freeze-drying method, and the outer layer is a tubular support prepared through the electrospinning method or the freeze-drying method. The method can be used for preparing the small-caliber intravascular stent; the prepared intravascular stent has high cytocompatibility and biodegradability, can simulate the three-layer structure of natural blood vessels, can be used for repairing cardiovascular and cerebrovascular diseases, and belongs to the biomedical field.

A large caliber myriametre rubber laminated tubing used for oil recovery and a producing method belong to the rubber hose shaping field. Aiming at the defects that the existing technology only can produce the rubber tube with small caliber and short length and can not used in the oil field, disclosed is a large caliber myriametre rubber laminated tubing and a producing method, wherein the tube which is provided with a mat adding layer along the radius direction on the rubber alloy hose surface. The first and the second reinforced layers and the rubber outer protective layer are provided with rubber alloy sizing layer therebetween in order to increase the adhesion. The producing method of the tube includes preparing the rubber alloy sizing, core free extrusion, making the mat adding layer, the first and the second reinforced layers and the rubber outer protective layer, sulfuration and pressuring check, the obtained products has the caliber of 30-50 mm, the length of 800-2000, which is suitable for the oil field.

The invention provides a small-caliber artificial blood vessel with a three-layer composite structure, and a preparation method of the small-caliber artificial blood vessel. The small-caliber artificial blood vessel comprises a weaving inner layer, an electrostatic spinning intermediate layer and a polyurethane outer layer, wherein the electrostatic spinning intermediate layer is arranged on the outer side of the weaving inner layer; the polyurethane outer layer is arranged on the outer side of the electrostatic spinning intermediate layer; the weaving inner layer comprises a first weaving stand pipe and a second weaving bracket stand pipe; the second weaving stand pipe is a weaving stand pipe with axial yarns, and is arranged on the outer side of the first weaving stand pipe. The small-caliber artificial blood vessel adopts a simulation structure; the weaving stand pipes serve as enhancement layers and are relatively high in compliance; the electrostatic spinning intermediate layer adopts a precise three-dimensional reticular structure, so that coated drugs and growth factors are released step by step in the degradation process, thrombosis is prevented, and cell growth is facilitated; the polyurethane outer layer is relatively high in compliance and adopts a microporous structure, so that biomass transmission is facilitated; both PDO and PLLA are degradable materials, so that gradient degradation can be realized, the contact between the polyurethane material and blood can be reduced, the foreign-body reactions to the PDO and PLLA materials can be prevented, and the long-term patency rate can be improved.

The invention discloses a flowmeter with a middle through-hole movable throttling element connected with elastic membranes or a bellows, which belongs to the throttling flowmeter in the automatic detection technical field; the patent 'a middle through-hole movable throttling element flowmeter' depends on the thrust of the movable throttling element, and does not like a fixed throttling element which measures the flow according to the flow differential pressure, so a pressure pipe can be dispensed, the flowmeter is applicable to measuring small calibers and dirty liquids, the isolation, the pressure-bearing, the support and other functions of the flowmeter are all respectively realized through different components, and the integral structure is more complicated. The flowmeter adopts the elastic membranes or the bellows to be connected with the middle through-hole movable throttling element, the isolation, the pressure-bearing, the support and other functions are realized independently by the elastic membranes or the bellows, the integral structure of the flowmeter is greatly simplified, not only are all the advantages of the through-hole movable throttling element obtained, but also a plurality of performances are improved, and the invention makes the through-hole movable throttling element flowmeter which is a novel meter be more easily popularized and used.

A method of manufacturing a low observable photoluminescent tracer projectile, for use with a small caliber weapon at night—which method utilizes a base phosphor material of Ca, Sr and S, or a base phosphor material of Y2, O2, and S—with a combination of minor dopant ingredients; which base phosphor material is mixed with a clear binder to form a photoluminescent material which is applied to the rear end, or base, of a small arms projectile as a thin layer; to which thin layer is added a layer of small retro-reflectors—whereby, when this projectile is fired from the weapon, the photoluminescent mixture will be activated and will be observable, using night vision at an angle of 0 to about 20 degrees from the rear end of the projectile.

Disclosed is a firearm having dual barrels comprising a firearm body which is equipped with a small caliber barrel and a large caliber barrel; a selector installed on one side of the firearm body to select the type of bullet and the mode of firing; a fire control system installed on the firearm body to enable aiming the target through detecting the target both at day and night time; a firearm switch unit installed on the firearm body to transmit the information on the firing of the bullet; a fuse setter installed on the firearm body to transmit the control signal of the fire control system to the fuse of the explosive bullet which is introduced into the large caliber barrel; and a sensor device unit installed on the firearm body to transmit the position of the selector and sensed firing signal to the fire control system.

A sub-caliber in-bore device placed within a launching structure of a larger caliber weapon system used to simulate the firing and ballistic trajectory of a larger and relatively more expensive weapons round. The said device essentially comprises a smaller caliber weapon subsystem with recoil suppression mounting subsystem, traverse and elevation adjustment subsystem, firing circuit delay timer, and an electrical connection subassembly to allow communications with the launching system. This invention provides an accurate, realistic, and cost-effective training experience to the operator.

A system that holds clay targets for the purposes of target practice which comprises interchangeable single and double tier target holders for holding clay targets, paper targets, or swinging metal targets is herein disclosed. The target holders are approximately forty-eight (48) inches in length and are connected at each end to a vertical tube which slides over a steel leg post that is subsequently inserted securely into a grade surface. The leg posts are approximately forty-eight (48) inches in height and are provided with a foot peg to aid in the grade surface insertion process. The double tiered target holders are particularly designed for clay pigeon targets and comprise channels lined with self-adhesive felt strips to aid in keeping the clay pigeon targets in position and prevent sliding. The invention is envisioned to be utilized with small caliber handguns and rifles such as BB guns, pellet rifles, .22 caliber rifles, and the like.

The invention relates to a small-caliber aspherical composite precise processing method. The method comprises the following steps of: 1. clamping a workpiece (5) on a precise machine tool, wherein axes of a grinding wheel spindle (2) and a grinding head spindle (9) are parallel, separated from a sliding table (4) and intersected with the axis of a workpiece spindle (6); and grinding and processing an inclined shaft of the workpiece (5) by a micropowder grinding wheel (3); 2. carrying out in-place measurement on the workpiece (5) by using a detecting device (7) to generate a compensation processing track, and then processing along the track by the mocropowder grinding wheel (3); and 3. using a grinding head (8) to grind and polish the workpiece (5) to finally obtain a finished product. In the small-caliber aspherical composite precise processing method, precise inclined axis mirror grinding and inclined axis magnetorheological polishing and grinding are integrated into a single machine tool, so that the installation and the tool setting errors are reduced, the working hours are also reduced, the accuracy and the efficiency are improved, the interference phenomenon is prevented, the controllability is good, and continuous processing can be achieved.

The invention relates to an unfoldable reflecting mirror body based on a double-curvature negative poisson ratio chiral honeycomb structure. The unfoldable reflecting mirror body consists of a laying layer and a double-curvature negative poisson ratio chiral honeycomb structural layer; and the structural layer has a paraboloid shape, and the internal surface of the structural layer is the laying layer. The structural layer is made from shape memory polymer materials, and the laying layer is made from metal materials and carborundum or carborundum-based composite materials. The unfoldable reflecting mirror body is used for solving the problems that an aerospace reflecting mirror cannot meet the use requirement on the high ratio of the unfolded volume to the contraction volume, and has low light weight degree, a small caliber and a complicated control system. The unfoldable reflecting mirror body has the functions of obtaining a higher ratio of the unfolded volume to the contraction volume, and repeated folding and unfolding for a plurality of times, can be unfolded at one time, and has a simple structure, high light weight degree, high system reliability and strong stability.

Implantable medical leads have reduced diameter while providing for optimized mechanical and electrical properties, by reducing the diameters of the conducting cables used within the leads for sensing and delivery of therapeutic electrical stimulation. In an embodiment, conducting filaments within a cable have oval cross-sectional areas. Suitably orienting the oval filaments increases the contact surface between adjacent filaments, broadly distributing the pressure between filaments and reducing fretting fatigue, while the oval cross-sectional area also increases conductivity. In an embodiment, non-conducting coatings around filaments within a cable, or around groups of filaments organized into cable-layers, reduce fretting fatigue. In an embodiment, the cross-sectional area of filaments decreases as the filaments are positioned at increasing radial distances from the center of the cable. In an embodiment, the relative composition of various filament metals and / or alloys is varied in filaments at different radial distances from the center of the cable.

The present invention belongs to the field of optoelectromechanical system, and the robot moving mechanism includes driving part, containing part and supporting part. The driving part connects the DC servo motor and worm gear via the containing part and ensures enough friction force during driving via the supporting part. The present invention features that the driving part inside the driving wheel support adopts single driving wheel assembly to transmit motion and single DC servo motor, that the driving wheel assembly is connected to the worm shaft and the single DC servo motor via the shaft coupler in the connecting part, and that the support wheel in the supporting part adopts suspended spring-block structure to ensure proper pipe diameter change and radial extension. The present invention has no jamming, simple structure, low cost and easy realizing, and is suitable for small caliber pipeline.

The present invention relates to a non-toxic primer powder composition for small caliber ammunition characterized by comprising potassium nitrate coated with shellac as an oxidizer, and particularly characterized by comprising 25-40 wt % of an initiating explosive, 10-30 wt % of nitrate ester as a fuel, 32-40 wt % of a shellac-coated potassium nitrate (KNO3) as an oxidizer, 5-10 wt % of tetracene as a first sensitizer, 3-9 wt % of a borosilicate powder as a second sensitizer and 0.1-0.2 wt % of a chemical binder.

The invention relates to a preparation method for a large-area single-layer tungsten disulfide film based on atmospheric pressure chemical vapor deposition and a product. The preparation process comprises SiO2 / Si substrate cleaning, spin coating of a WO3 anhydrous ethanol dispersion solution, substrate drying treatment, sample placement and tungsten disulfide film growth. By the adoption of the method, WO3 precursor is uniformly dispersed on a substrate by spin coating of the WO3 anhydrous ethanol dispersion solution, a single-ended-closed small-caliber quartz tube is placed in a quartz tube growth chamber, and the amount of S powder and WO3 precursor participating in a nucleation and film growth process is effectively controlled, so that the prepared tungsten disulfide film has the largearea, single layer and large size. The method has the beneficial effects of being quick and repeatable and is significant in preparation of the large-area single-layer tungsten disulfide film.

The invention discloses a self-centering target-ball mounting seat used for small caliber. A column-shaped magnet (1) absorbing a target-ball 3 is arranged at the center of an axial outer sphere groove of the big-end step of a target-ball mounting seat head (2); the center of a positioning column (4) is hollow; a groove (5) provided with the cross-shaped section projection is arranged along the whole length of the column face of the hollow positioning column (4). A target-ball column-shaped magnet is arranged at the center of the sphere groove to absorb the target-ball so as to realize the self centering. The hollow positioning column (4) is divided into four pieces of elastic positioning pieces by the cross groove and the elastic positioning pieces generate elastic distortion to lead the positioning column to closely contact with apertures to be measured so as to eliminate the mounting clearance between the two parts, avoid the bigger deviation of the measurement result and reduce the mounting error of the target-ball mounting seat. The self-centering target-ball mounting seat is especially suitable for the laser tracing measurement of apertures of 3 to 8mm and the aperture tolerance under IT12.

The invention provides an ultrasonic detection method for a weld joint of a small-caliber pipe shelf angle. A digital ultrasonic fault detector is adopted to calculate and determine the refraction angle of a probe utilizing the formula that beta is equal to or larger than tan<-1>[(H+L0) / 2T] according to weld joints of pipe shelf angles in various specifications, so that the acoustic beam axis of the primary reflection wave can reach the end part of a pipe adapter, wherein H is the sum of the weld joint of the shelf angle, the depth of a header groove and the insertion depth of the pipe adapter, and T is the wall thickness of the pipe adapter; a monocrystal transverse wave angle probe with a corresponding refraction angle is adopted for detection from the outer side of the pipe shelf, so that a defect at the root part of the welt joint of the shelf angle can be effectively detected, a defect wave and structural wave can be accurately identified, missed detection and wrong detection during the detection of the workpieces can be reduced, and the accuracy of the detection work can be greatly improved.