Abstract: The drafting apparatus has only three parts which are the permanently attached first head and blade, the adjustably attached second head, and the thumb screw. The apparatus quickly adjusts to a given surface. If secure attachment is desired, the thumb screw is tightened against the blade to position the second head firmly against a side of the surface opposite the first head. If desired, the second head is easily completely removed, to aid a draftsperson in a given task. The apparatus is not confined to use only on a drafting table. The transparent bevels provide visual access to indicia under part of the blade. The relatively long length of the elongated slot provides for fit to even narrow drawing surfaces.

Abstract: A device for measuring five parameters which define the riding position of a bicycle, which device may also be used as a jig to guide adjustment. The five parameters measured are: position height, saddle setback, saddle angle, reach to the bars, and bar angle The device treats these parameters as functions of a given rider's anatomy, and compensating adjustments factor out changes in crank length, height of shoe sole or height of pedal which would otherwise alter a rider's “reach” to the pedals. The device includes the scales and gauges needed to perform all measurements or to be used as a jig, as well as the fittings needed to attach it to a bicycle. No other tools are needed, and no disassembly of the bicycle, including crank bolts or cranks, is needed.

Abstract: A Multifunction Layout Tool capable of performing the functions of an adjustable square, adjustable T-square, try square, combination square, protractor, angle duplicator, depth gauge, rip gauge, rafter-stair layout tool, and compass is disclosed. The tool comprises a generally T-shaped squaring base, mounting an elongated sliding rule. The base is comprised of a body defining a central flared channel to receive the rule and a pair of squaring arms extending from the body, defining a squaring edge along an end of the base, perpendicular to the channel. The rule is disposed in and extends out of the channel, between the squaring arms. The rule is a blade having a rounded end, a square end, and a central longitudinal slot. A fastener anchored to the base, extending through the rule slot, maintains the rule within the channel. Protractor indicia disposed within the channel and corresponding vernier indicia on the rounded end of the rule measure disposition angles of the rule when the rule is fully extended.

Abstract: An all-in-one drawing apparatus has a protractor integrated with horizontal and vertical rulers on a drawing board. The vertical ruler has a pen holder adapted to move and scribe within the vertical ruler. The vertical ruler can pivot according to measured angles on the protractor portion.

Abstract: The present invention relates to a kind of movable device which varies at any angle to serve as measurement ruler, and more particularly to an improved structure of measurement ruler with multiple functions in use. The ruler's main body is L shaped with engraved number of degrees on both sides, one side with sliding channel and a sliding through installed at the lower end of the sliding channel, which is wider in breadth than the channel, one measurement ruler like a straight stick with engraved numbers in degrees, one end of which is in conical shape and the other end of which at the top there installs a sign index with a conical peeping hole and a set of installation holes, one scale ruler in semi-circular shape with sliding block in consecutive form. Under it, there is sliding column on which there are threaded lines. AT the front end, there in an assembly hole. The semi-circular body is engraved with the degrees in angle.

Abstract: An improved carpenter's square and protractor which can accurately duplicate a desired angle onto a surface to be cut. Accurate duplication of the desired angle is accomplished by a unique securing of the T-head on a bladed ruler wherein a securing by the draw bolt adjustment is accomplished in a transverse manner with respect to the plane of rotation of the T-head and the ruler member. In order to provide for center location of the draw bolt adjustment, a slide member which receives the ruler member is positioned in an offset manner with angular arm members. The T-head is multifunctional in that it not only provides a simplified protractor function with respect to the ruler but it also affords a supporting wall member onto which projections can be placed so that this device can be utilized to locate the centers of large circular objects. In addition, the T-head can so accommodate a level vial as well as a plumb vial.

Abstract: An adjustable T-square comprising an elongated blade with measuring indicia on its top surface and an elongated cross member having angular measurement indicia on its top surface. The blade and cross member are coupled together to provide precise relative perpendicular positioning, relative movement of the cross member along the longitudinal axis of the blade while maintaining the perpendicular relationship, and relative angular adjustment. The perpendicular orientation between the cross member and blade is provided by a notch within the top surface of the cross member which receives the blade. A threaded member and knob are employed for attaching the cross member and blade to permit relative positioning angularly and linearly while coupled, and to secure the blade and cross member in a desired position.

Abstract: A pair of first and second elongated arms are provided and the arms include corresponding base and free ends. Pivot structure is provided and pivotally connects the base ends of the arms together for relative 360.degree. angular displacement and the pivot structure and second arm include coacting structure whereby the axis of relative pivoting of the first and second arms may be adjustably shifted along the second arm. Also, the first and second arms include coacting latch structure whereby the arms, in at least one predetermined position of the pivot structure along the second arm, may be releasably secured in a plurality of relatively angularly displaced positions.