368results about "Non-circular curve drawing instruments" patented technology

The present invention relates to target acquisition and related devices, and more particularly to telescopic gunsights and associated equipment used to achieve shooting accuracy at, for example, close ranges, medium ranges and extreme ranges at stationary and moving targets.

The objective of this invention is to provide a solution that enable real, delayed or relayed time trade and delivery of time-tagged electronic information items from/among same or different regions' information content providers (190a, 190b) and/or their subscribers (201, 202, 211, 212, 221, 222) , or via their corresponding region's information content network operators and their subscribers (201, 202, 211, 212, 221, 222). In order to realize the objective, this invention provide a system to select wanted information items and package the unselected or for-not-use information items in specified time frame by mapping and grouping via a grid/matrics to packaging, labeling and pricing the items into for-trade-items or dealpacks and register them into trading database (200); a system for dealpack listing, online searching and purchasing; and dealpack's secret key submitting, verifying, encrypting transmission and decrypting delivery.

A device for calculating where a cue ball must cause an object billiard ball to strike the bumper of a billiards table in order to drive the object ball into a selected pocket of the billiards table of the type having two opposed end rails and two opposed side rails. The device includes a plotting board and a guide. The plotting board comprises a scaled playing table portion and at least one scaled mirror table portion having pocket positions formed thereon, wherein the mirror table adjoins at least one of the opposed end rails or opposed side rails and is a mirror image of the playing table portion. The plotter comprises a guide and an object ball arm, the object ball arm having a pocket guide end and an object end. When the guide is placed over a selected pocket position on the mirror table portion and the object ball end of the object ball arm is aligned with the object ball on the scaled playing table and the pocket guide end is aligned with the guide over the selected pocket position, the object ball arm will cross the scaled playing table at a point where the object ball must strike the bumper of the billiards table.

This device facilitates field marking an arc of a circle having an obstructed center. It comprises a first clamp having a slot to engage a standard tape measure and a second clamp having another slot to engage a color-coded tape measure. A detachable swivel joint snap connects the first clamp to the second clamp, and a handle is connected to the first clamp.

A method is provided to use the device, a standard tape measure, a color-coded tape measure, a rod, and a scribe to mark out such an arc. The method comprises identifying coordinates of an eccentric ellipse, whose foci are field accessible, that will substantially overlap the arc. The two tape measures are anchored to the two foci. The standard tape measure is stretched tight between the two foci while the color-coded tape measure provides a string line for marking out a closely fitting elliptical arc segment.

A measuring and layout device having a stationary member having a flat surface adapted to be marked on and an angle and distance device rotatably coupled to the stationary member. The angle and distance device includes a longitudinally and laterally rigid extendable tape that can be extended from a central point and that has an edge that facilitates reliably marking on the stationary member to form an accurate template as the angle and distance device is rotated and the tape is extended and retracted to critical features of an area.

A wound measuring device and system measures the length, width and depth of a wound. The device and system features first and second ruler members connected and secured by a connecting member which allows the ruler members to move to measure the length and width of a wound. The connecting member affords perpendicular movement of the ruler members providing accurate and consistent measurement of wounds irregular in shape and size. An end of the first or second member is designed to be inserted in the wound to measure the depth and undermining of the wound. Use of the device provides little to no discomfort to the patient.

The invention provides a plotting instrument for plotting a tangent curve. The plotting instrument comprises a bracket, wherein a support frame is connected with the top end part of the bracket; a sliding block plate is embedded at the upper end of the support frame; one side of the sliding block plate is connected with the end of the bracket; a gear rack is arranged on the other side of the sliding block plate and is meshed with a driving gear; the driving gear is provided with a rotary shaft; a transmission gear is arranged on the rotary shaft and is meshed with a rolling gear; a first belt pulley is connected with a second belt pulley; the second belt pulley is connected with a paintbrush driving gear; the paintbrush driving gear is meshed with a paintbrush transmission gear; a paintbrush frame is connected onto the paintbrush transmission gear; and a paintbrush is arranged on the paintbrush frame. The plotting instrument realizes plotting of the tangent curve through a tool, overcomes the defects of plotting through manual painting or a complex method, is simple in step, convenient and fast, high in precision, easy to manufacture and realize, and is an ideal plotting tool for teaching and learning.

A spectacle frame shape measuring apparatus includes a measurement element holding mechanism. The measurement element holding mechanism holds a measurement element in a substantially loadless state along a frame groove formed in the inner circumferential surface of a rim of a spectacle frame. The measurement element holding mechanism includes a rod, balance spring, and evacuating mechanism. The rod is vertically movable and has an upper end portion on which the measurement element is mounted. The balance spring pushes the rod upward to hold the measurement element at a loading position during shape measurement. The evacuating mechanism regularly evacuates the measurement element to an evacuation position, thereby performing three-dimensional measurement of a rim shape. A spectacle frame shape measuring apparatus holder is also disclosed.

An eyeglass lens measurement apparatus includes: a measurement unit which includes a tracing stylus to be inserted into a groove of a rim of an eyeglass frame, a moving mechanism for moving the tracing stylus along the groove of the rim, and a detector for detecting movement of the tracing stylus, and obtains three-dimensional shape of the rim based on a detected result by the detector; and a holding unit which includes upper and lower sliders for positioning the frame, left and right clamp pins for clamping the rim and left and right contact portion to be contacted with the rim which is clamped by the clamp pins, and holds the frame fixedly. The left and right clamp pins and the contact portions protrude from each of the upper and lower sliders. Each of the contact portions is formed at the periphery of each of the lamp pins.

The invention discloses an anti-tangent, cotangent, secant and cosecant function demonstrating and graph drawing instrument which is made according to a rectangular coordinate definition of an anti-trigonometric function and by combining pushing-turning principles with slider-connecting rod characteristics. The instrument comprises a support, a demonstrating device, a drawing mechanism and a drawing board, the demonstrating device is mounted on a lower slideway and an upper slideway of uprights, and the drawing mechanism is connected with the uprights, the lower slideway, the upper slideway and a guide rod, and connected with the demonstrating device through a soft rope and a pull rod. The above components are combined by adopting different assembly modes, anti-tangent, cotangent, secant and cosecant function relations can be demonstrated visually by only pushing a handle on the push rod, continuous and accurate function graphs can be drawn on the drawing board, paper or any fixed planes, and type forms of anti-tangent, cotangent, secant and cosecant can be demonstrated while corresponding graphs can be drawn. The drawing instrument can be used in a classroom, a drawing room, a construction site and a self-study place for students and is high in drawing efficiency, clear and accurate in graph, simple to operate, convenient to carry and complete in function.

A contour reading method for an item such as an eyewire for spectacles, the method using an appliance including a support for holding the item, and a rotary platform which is rotatably mounted in relation to the support about a rotational axis and carries a reading sub-set provided with a sensor consisting of a finger and a rod, the finger having a distal end. The distal end is displaced along the contour and successive positions thereof are detected. The method is characterized in that the displacement step includes a measuring step wherein the effort exerted between the platform and the rod is measured parallel to the rod, and a control step wherein the distance between the finger and the platform is controlled according to the effort in such a way that the intensity of the effort remains lower than a pre-determined threshold.

The Thread Ruler and Multi-Function Drafting Instrument is a single instrument designed to draw circles, ellipses and parallel lines, and which includes features that allow the instrument to function as protractor, a ruler and a drawing compass. The instrument has a slide ruler that holds a marking device and that has a stem with a thread attached. The thread is further attached to the main ruler body at an outer end of the protractor so that ellipses can be drawn. The instrument may be used on any flat marking surface including: paper, drafting table, chalkboard and dry erased board. The instrument may be adapted to be used in portable manner so that it can be placed in shirt pocket.

An apparatus for boring stoma wafers is provided, which comprises a base and a cutter, and enables even a user himself to easily make in a stoma wafer a substantially elliptic hole having a beautiful inner circumference. The base comprises an upper base member on which a stoma wafer is placed so that the stoma wafer can be temporarily fixed thereon, and a lower base member supporting the upper base member so that the upper base member can be moved freely. After a stoma wafer in which a circular hole has been made by the cutter is slid with the upper base member, a circular hole is bored again by the cutter in a position which is staggered from the center of the initially-formed circular hole, and this enables a non-circular hole comprising not less than two staggered circular holes to be made in the stoma wafer.

A mechanical computer used in tandem with a GPS to approach, enter and fly the traffic pattern of any uncontrolled airport. Pilots must navigate to a relatively small area or approach point before entering the traffic pattern of an uncontrolled airport. While airports are programmed into GPS units, the approach points are not. The computer works in tandem with an onboard GPS unit programmed for navigation direct to the airport of intended landing and employs triangulation to navigate to an approach point from which a proper traffic pattern entry can be made.

The invention relates to an elliptical gear profile generator. The elliptical gear profile generator comprises a base, wherein an elliptical gear, a circular gear and a standard gear are arranged on the base; the circular gear is engaged with the elliptical gear; the standard gear is coaxial to the circular gear; an elliptical groove which is similar to the elliptical gear in shape is arranged on the base at the outer periphery of the elliptical gear; and the circular gear shaft extends to the elliptical gear. The profile generator can be used for regenerating the profile curve of the to-be-machined elliptical gear by virtue of an envelope curve of a tool profile curve, is very simple in structure, and low in manufacturing cost.

The invention relates to a cam in the machine manufacturing field and in particular relates to a hand-operated cam mechanism characteristic-curve drawing instrument. The hand-operated cam mechanism characteristic-curve drawing instrument is mainly composed of a positioning plate, an eccentric wheel, a positioning block, a ball slide bar, a preload device, a drawing board, a guide rail I, a guide rail II, a movable slider group, a base, a roller pin assembly and a synchronous transmission mechanism; the positioning plate is vertically connected with the base; the drawing board is connected with the guide rail II; the guide rail I is horizontally fixed in front of the positioning plate; a rack is connected with the guide rail II and engaged with a gear; the gear is coaxially connected with an upper synchronous pulley; a lower synchronous pulley is coaxially connected with the eccentric wheel; the upper synchronous pulley, the lower synchronous pulley and a synchronous belt are located behind the positioning plate; the positioning block is located under the guide rail I; the movable slider group is fixed in the positioning block and can be adjusted; the ball slide bar is located in the ball slider and capable of sliding up and down; the upper end of the ball slide bar is connected to the preload device, while the lower end of the ball slide bar is hinged to a pin; a rolling bearing is in rolling contact with the eccentric wheel.

Auxiliary drafting instrument combination applicable to digital board, including a base seat formed with at least one pivot hole; a compass having a pivot seat for pivotally connecting two legs, a bottom end of one of the legs being snugly pivotally fitted in the pivot hole of the base seat, the other leg being connected with an electronic pen; and a subsidiary ruler one end of which is pivotally connectable on the base seat. By means of the combination of the base seat and the compass, a circle can be input on the digital board or by means of the combination of the base seat and the subsidiary ruler, an oblique line can be input on the digital board.