Abstract: A thread construction of a length measuring instrument wherein a spindle is provided by forming out of a ceramic material an externally threaded portion on the outer peripheral surface thereof. A plurality of externally threaded pieces are cut from an externally threaded member made of a material identical with and having a pitch equal to the externally threaded portion of the spindle and fixedly secured to the inner peripheral surface of a sleeve opposed to the externally threaded portion to thereby make the spindle be of a screw feed type, and the manufacturing method therefor.

Abstract: A height gauge is disclosed which rests on a surface plate and is used for measurement of dimensions and marking-off operations. Supports slidably supporting sliders are planted in rotary members rotatably provided on a base, and the measurement of dimensions and marking-off operations are performed in a state where the supports are held at inclinations by means of a locking device for preventing the rotary members from freely rotating.

Abstract: Two-leg vernier calipers characterized in that it consists of a main beam assembly comprising two legs parallel to each other, a vernier assembly supported on the main beam assembly and separate measuring jaws for the main beam and the vernier fitted thereto; each measuring jaw can be selected depending on the type of instrument to be assembled, thereby making it possible to standardize the main beam assembly and the vernier assembly; and accordingly the main beam assembly and the vernier assembly can be made of different materials from the measuring jaws; and the manufacturing method of this two-leg calipers, in which the measuring jaws are fixed at right angles to the two legs of the main beam and the vernier, thus rendering it needless to fit together their measuring surfaces after assembling.

Abstract: A vernier caliper includes a main beam body consisting of two round rods parallel to each other and connected together at one end by a jaw, and at the other end by a rear frame. A vernier is supported freely and slidably on the rods. The rods can be hollow and can have their respective ends inserted into openings of the jaw and rear frame and secured in the openings with adhesive, solder, or screws. A rack can be formed on one of the rods to drive, for example, a dial indicator, and graduations can be provided on a rod to read the measurement taken with the vernier. This construction provides a more accurate vernier caliper which can be precisely assembled without grinding, for example, jaw faces, after assembly to calibrate the caliper.

Abstract: A portable, lightweight measuring instrument comprising a main beam and a slider which are relatively displaced to carry out a measurement, a counter which indicates the relative displacement between said main beam and said slider by rack-and-pinion combination, and a dial gauge separate from said counter, both said counter and said dial gauge being mounted on said slider.