902 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.

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 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 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.

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.

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 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 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 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.