Abstract: This invention relates to a straightly extensible measuring tape which can maintain a straight extension when it is extended. It comprises a curvature portion having a larger arc than a semicircle at section of a width direction of the measuring tape under a forceless state when it has been extended, and a flattened portion integrally formed with the curvature portion. Consequently, the measuring tape of this invention is able to be wound or extended at one's option by using a preferred winding means.

Abstract: This invention relates to a spike shoe including a sole, a plurality of spike pins mounted thereupon and a resilient elastic material fixed with the sole, the resilient elastic material having such a thickness that each spike pin can be concealed therein, and including a plurality of holes in order to permit the spike pins to protrude from the resilient elastic material when the weight of human body is applied to the spike shoe, whereby the spike pins are forced into the ground. When the weight is removed from the sole, the spike pins are retracted into the resilient material leaving any mud which may have been stuck to the pins on the smooth bottom surface of the sole from which the mud may be easily removed.

Abstract: The present invention relates to a device for moving upwardly and downwardly a heavy device like a sewing machine body by make use of a constantly loading spring, more particularly, an ascent and descent means of a free-arm sewing machine, comprising an ascent and descent guide means like a guide rail in a cabinet of a free-arm sewing machine, a guide bar slidable inside the ascent and descent guide means, said guide bar being installed under a rectangular base plate for fixing the sewing machine body, a constantly loading spring of balanced or over-balanced load to be provided between the cabinet and the base plate, and a latch means which is provided at the ascent and descent guide means in order to fix the sewing machine body at a preferred position.