초록 ▼

A golf development and training device has first and second rods detachably connected at first and second connection points. Both rods contain multiple apertures for the receipt of one hooked end of a stretchable or elastic tube. The rods define a space between them when they are connected. A grip s

A golf development and training device has first and second rods detachably connected at first and second connection points. Both rods contain multiple apertures for the receipt of one hooked end of a stretchable or elastic tube. The rods define a space between them when they are connected. A grip slidably engages the first rod and audibly clicks as it slides against the second rod when certain critical aspects of the training motion are correctly performed. At least one elastic tube is connected between the rod assembly and an attachment device which is secured to a stationary object that provides resistance and support. The attachment device includes vertical and horizontal rows of attachment apertures that receive the other end of the elastic tube. Multiple elastic tubes may be used, the number of which is dictated by the level of resistance desired during any particular exercise or training movement.

대표청구항 ▼

A golf development and training device has first and second rods detachably connected at first and second connection points. Both rods contain multiple apertures for the receipt of one hooked end of a stretchable or elastic tube. The rods define a space between them when they are connected. A grip s

A golf development and training device has first and second rods detachably connected at first and second connection points. Both rods contain multiple apertures for the receipt of one hooked end of a stretchable or elastic tube. The rods define a space between them when they are connected. A grip slidably engages the first rod and audibly clicks as it slides against the second rod when certain critical aspects of the training motion are correctly performed. At least one elastic tube is connected between the rod assembly and an attachment device which is secured to a stationary object that provides resistance and support. The attachment device includes vertical and horizontal rows of attachment apertures that receive the other end of the elastic tube. Multiple elastic tubes may be used, the number of which is dictated by the level of resistance desired during any particular exercise or training movement. rd of this level (which still makes for a rather heavy apparatus). A group of engineering students at the Oregon Institute of Technology, however, has produced a pogo stick with a 47-inch custom-made steel spring intended to propel 250 pounds to a height of 5 feet (implying a capacity of 1700 joules, and a spring weight approaching 40 pounds). Their attained height is 18 inches; they express disappointment, and blame the unwieldiness of the design. No radically-adjustable steel-spring pogo is known, although devices which suggest such a development were discussed as early as 1881. For example, U.S. Pat. No. 438,830 to Yagn in 1890 discloses compound-coil-spring jumping stilts. Several designs which precompress a coil spring to effect a form of adjustability have been presented, for example, in U.S. Pat. No. 238,042 to Herrington in 1881; U.S. Pat. 2,793,036 to Hansburg in 1957; and U.S. Pat. No. 3,773,320 to Samiran et al. in 1973. Such pre-compression does not scale the spring (that is, change its strength), and is of little mechanical significance. Pogo sticks with enclosed coil springs are shown by Hohberger (U.S. Pat. No. 2,712,443 in 1955), Rapaport (U.S. Pat. No. 2,871,016 in 1957) and Gaberson (U.S. Pat. No. 3,116,061 in 1963). Hohberger assembles his molded frame permanently around the coil. Rapaport places a flexible plastic cover around the spring. Gaberson places the spring inside the piston, and adds a frame-attached plunger to compress it. All of these designs are limited by the modest capacity of their steel springs. Air-spring pogo sticks have achieved commercialization using low-pressure air springs, the air being contained either in a ball-like bladder or in a block of low-density plastic foam. Such devices are successful as children's novelties but are not well-suited to more demanding applications due to the bulk of the entrapped air column. High pressure air springs are theoretically capable of achieving any desired level of performance, and also hold the promise of straightforward adjustability. Their use in pogo sticks was suggested by Woodall (U.S. Pat. No. 2,865,633 in 1958), who stressed the benefit of adjustability, and others (Bourcier de Carbon in U.S. Pat. No. 2,899,685 in 1959; Guin in U.S. Pat. No. 3,351,342 in 1967). There is, however, a practical problem: the energy stored is present in the form of heat at the bottom of the stroke - and due to the relatively large amount of energy and relatively small amount of gas, temperatures of several hundreds of degrees are attained. A leading manufacturer has told me of experiments which ended in dismay when the cylinder became hot enough to burn the jumper's legs. Elastomer-powered pogo designs appear in Gaffney and Weaver (in U.S. Pat.