Abstract: An adjustable spring device for Walking and running is attachable to the user's footwear. The device includes an upper sole coupled to the footwear, a lower elastic sole, and a support bracket configured as a curvilinear confined band that includes a flat top fastened to the upper sole, and a concaved bottom fastened to the lower sole. The lower sole is furnished with a plurality of slots, preferably straight-lined, and aligned at a predetermined angle, cut from the periphery towards the longitudinal axis of lower sole and ending at predetermined points thereof. The slots are preferably so arranged that, if the predetermined points are linked by four straight lines extending therethrough, the four lines will form a rhomb-shaped figure having two vertexes positioned at the front and the rear ends of the lower sole. Means for variable adjustment of the support bracket are provided, creating comfortable energy exchange conditions.

Abstract: An adjustable collar stay has two components: a) a housing, and b) a movable piece having a wider head and elongated portion, the elongated portion adapted for slidably moving within the housing. The wider head is at least one cross-section disposed perpendicular to the point of entry (portal) into the housing, preventing its entry thereto. A spring-loaded pin, situated within the housing, engages with a pit, cut into the side of the elongated region of the movable piece. By grasping the head and pushing it transverse to the direction of the housing, one dislodges the pin from a pit, and moves the movable piece with respect to the housing, in order to elongate or shorten the entire device.

Abstract: Disclosed are detachable safety goggles for safety helmets including a frame provided with rack gears formed at both leg parts thereof, inner housings allowing the leg parts to enter and exit the inner housings and provided with first snap protrusions, outer housings allowing the leg parts to enter and exit the outer housings and provided with first snap gears, rotating handles combined with the outer housings and provided with pinion gears corresponding to the rack gears, and holders combined with the upper ends of the outer housings and combined with the frame of a safety helmet. The detachable safety goggles for safety is detachably attached to the safety helmet, and the wearing distance and angle of the goggles with a worker may be conveniently adjusted as the worker desires.