Abstract: The disclosed invention relates to easy-to-use precision tools that locate the mid-line, or center line, of any symmetrical geometric shape, such as triangles, squares, circles, rectangles, parallelograms, trapezoids, and symmetrical polygons. Given two separate points on the edge of a symmetrical geometric shape, these precision tools identify the center line of the geometric shape between those two points, without the need for additional measurements or mathematical calculations. The precision tools can also be used to identify the center points of symmetrical geometric shapes.

Abstract: A centerline marker holder used for engaging and sliding along a portion of two intersecting walls and sliding along an exterior or interior rounded or bull nose corner between the walls. The marker holder uses a pencil for drawing a centerline along a length of the corner. The marker holder includes a flat, first wall engaging member attached at an angle to a flat, second wall engaging member. Along a length of an intersection of the first and second wall engaging members is a centerline hole. The centerline hole is dimensioned to receive the pencil therethrough for marking the centerline. The marker holder also includes a plurality of offset holes from the centerline hole for drawing parallel offset lines at a selected distance from the centerline.

Abstract: A guide device for cutting lap joints includes a frame and a rectilinear guide member, the frame having a Y-like shape and consisting of a removable top portion and a bottom portion forming a yoke therebetween at the upper portion of the Y-like frame. The lower portion of the Y-like frame has a guide portion and one side of the guide portion extends to be co-linear with one side of the yoke portion forming a first adjustable guide surface. The guide portion is provided with a guide way running longitudinally along the guide portion with a movable stopper provided so as to move along the guide surface as guided by the guide way. The movable stopper has a lockable member for locking the movable stopper in any desired position along said guide surface. The other side of the guide portion opposite to the guide surface forms an angle of 45 degrees with another contiguous side of the yoke portion and a fixed stopper is formed near the junction of the yoke portion and this other side of the guide portion.

Abstract: A center finding device for locating the geometric center of a workpiece having substantially parallel side surfaces including a pair of crossed arm members pivotally secured to each other by a tubular member with a marking pin received therein and secured at one end and in slidable-pivotal relation to a longitudinal slot in each of a pair of side guide arms whereby when the guide arms are moved into engaging relation with the parallel side surfaces of the workpiece, the crossed arm members are automatically slidable into a position with the tubular member being in a geometrically centered position with respect to the workpiece. In addition, the center finding device can be used in conjunction with an accessory for locating the geometric center of a workpiece having substantially non-parallel side surfaces.

Abstract: An apparatus for locating the geometrical center of a lens, whether in or out of an eyewear frame, includes a flat platform adapted to seat an eyewear lens thereon and a framework mounted on the platform and having first and second pairs of opposite side members extending in substantially orthogonal relationship to one another and intersecting with one another so as to define a substantially rectangular enclosure having first and second pairs of diagonal corners. The side members of the pairs thereof are mounted to the platform for undergoing relative movement so as to adjust the distances therebetween and thereby the length and width of the enclosure to fit about the lens seated on the platform.

Abstract: The invention consists of a combination safety guide and measuring tool providing a safe, reliable means for advancing wood over or through table mounted wood working equipment, and in addition, providing a measuring tool for many important wood working problems. Among the unique features provided by this device are a conventional push tool, a means for measuring the distance of the cutting tool from the wood piece, and a means for accurately measuring the height of the cutting instrument. Because of the unique design of this invention, the worker can perform many measuring functions without the necessity of several measuring tools and, in addition, have a safe, reliable pushstick for moving the wood piece through the wood working equipment.

Abstract: A center punch block device is set forth wherein a main body includes a level pivotally mounted thereto within a slot transversely oriented within the block and transversely arranged to an elongate "V" slot formed within a lowermost surface of the body to accept elongate workpieces therewithin to enable alignment of the workpieces within the "V" shaped slot wherein a punch orthogonally oriented relative to the "V" shaped slot produces an indicator mark upon impacting of an upper end of the punch.

Abstract: A center marker for locating and marking the ends of turning squares or billets prior to mounting them in lathe centers. The marker includes three orthogonal plates which are joined to form a corner, and the base plate is fitted with a knife which protrudes from the base surface in order to mark the billet end when it is brought against the knife while cradling adjacent billet surfaces against arms of the marker.

Abstract: A jig for use in locating and drilling hole positions in cabinet doors and drawers. The jig comprises a stationary L-shaped member for placement at the corner of the door or drawer. A slidable member adjusts for direction along one axis and a pair of slides on the slidable member move along an axis perpendicular to the first axis. The slides are of transparent material and have guides to accommodate a drill bit.