947results about "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.

A multi-purpose tool includes a graduated extension pivotably and lockably connected to a leveling extension. The graduated extension includes graduations for measuring length, angles, pitch, or a combination of these measurements. Angles may also be measured with a graduated disc. The leveling extension includes at least one bubble level for checking the horizontal or vertical orientation of the leveling extension. The leveling extension may include graduations for measuring length, angles, pitch, or a combination of these measurements. The tool may be extended such that the graduated and leveling extensions are collinear, having a total length of 16 inches end to end. A multi-purpose tool may be conveniently used to take the place of several separate tools such as a speed square, a T-bevel, and an extended torpedo level. The tool may also allow quick determination of the required distance between wall studs, rafters, and floor joists.

An adjustable carpenter's square for the quick and reproducible measurement of angles and radii. The adjustable carpenter's square includes a center bar that includes a set of indicia. The indicia are any appropriate set of graduations, which may include numerical notations. A indicator slide is receivable onto the center bar. The indicator slide includes a first and second slide strut pivot. A first and second strut attach to the indicator slide. A first wing attaches to the center bar and the first strut. The first wing also includes a first wing strut pivot. The first wing strut pivot hingably connects the first wing to the first strut. The first wing strut pivot attaches to the first strut. A second wing attaches to the center bar and the second strut. The second wing includes a second wing strut pivot. The second wing strut pivot hingably connects the second wing to the second strut. The first and second wings pivotably connect to the center bar. The indicator slide connects to the first and second struts. A measured relation is formed between the first wing with the second wing. The position of the indicator slide on the center bar is relatable to the measured relation by way of the set of indicia displayed on the center bar. The measured relation can include such values as: angles, pitches, radii, diameters, distances, segments, arcs and chords.

A protractor and ruler combination includes a main ruler having a side formed with a protractor, a secondary ruler rotatably mounted on the main ruler, and an auxiliary ruler having a side secured on the secondary ruler, so that the secondary ruler is moved in concert with the auxiliary ruler on the protractor of the main ruler. Thus, the auxiliary ruler is moved relative to the main ruler, and the secondary ruler is moved in concert with the auxiliary ruler on the protractor of the main ruler, so that the included angle between the ruler section of the main ruler and the ruler section of the auxiliary ruler is measured exactly.

A measuring device for measuring the arc of an arched window comprising a base; measuring means selectively rotatable relative said base for measuring a distance between said base and said arch at a selected angle.

A pipe preparation device is disclosed for chamfering pipe ends and placing witness marks thereon to provide a visible indication that the pipes are properly engaged with a coupling. The device includes a body having co-axially aligned receptacles at opposite ends, the receptacles being sized to receive pipes having different diameters from one another. Cutting blades are mounted on the body and project into each receptacle. The blades have cutting edges that engage the end of a pipe inserted into a receptacle and cut a chamfer when the body is rotated relatively to the pipe. Two scoring tools project into each receptacle. The tools have contact surfaces that engage a pipe inserted into the receptacle. The tools in each receptacle are offset from one another and form two circumferential grooves around the pipe when the body and pipe are rotated relatively to each other. The grooves act as witness marks.

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.