Exercise apparatus for resistance training

The invention relates to exercise apparatus for resistance training, and more particularly to the resistance mechanism or strength engine.

Exercise apparatus for resistance training, including cardiovascular exercise/training, employ various resistance mechanisms, including a weight stack and various biasing means opposing a given direction of movement. The present invention provides exercise apparatus with a simple, effective resistance mechanism.

FIG. 1 is a perspective view of one form of exercise apparatus in accordance with the invention.

FIG. 2 is an enlarged perspective view of a portion of FIG. 1 showing the resistance mechanism.

FIG. 3 is an enlarged perspective view of a portion of FIG. 2 .

FIG. 4 is a perspective view of a component of FIG. 2 .

FIG. 5 is a perspective view of a component of FIG. 2 .

FIG. 6 is a perspective view of a component of FIG. 2 .

FIG. 7 is a perspective view of a component of FIG. 2 .

FIG. 1 shows one form of exercise apparatus 10 having a resistance mechanism 12 . The exercise apparatus shown is a seated arm curl machine having a frame 14 resting on the floor and supporting a seat 16 for the user, an upper arm pad 18 , an arm bar 20 pivoted about axis 22 and having grip handles 24 , 26 for gripping by the user for an upward pulling curling motion in an arc about axis 22 , all as is known. A lever 28 , or alternatively an eccentric cam, is fixed to arm 20 and/or pivot rod or axle 30 along axis 22 and pivots with arm 20 to pull cable 32 upwardly, which cable is trained around pulley 34 and is connected at cable end 36 to resistance mechanism 12 . Various resistance mechanisms are known in the prior art for resisting movement of the cable, to provide strength training, including cardiovascular training/exercise, such as weight stacks and various biasing mechanisms. Resistance mechanism 12 may be used with various types of exercise apparatus for resistance training, including cardiovascular training/exercise. The arm curl machine is exemplary only.

Resistance mechanism 12 of the exercise apparatus includes a first disk 40 , FIGS. 1 , 2 , 4 , rotational about an axis 42 , a second disk 44 , FIGS. 1 , 2 , 5 , axially aligned with first disk 40 and resisting rotation about axis 42 , and a resiliently deformable coupling 46 coupled between disks 40 and 44 and tensionable in a spiral about axis 42 upon rotation of disk 40 about axis 42 , such that rotation of first disk 40 about axis 42 tensions and stretches coupling 46 along the noted spiral and is resisted by second disk 44 . In the preferred embodiment, each of disks 40 and 44 , and a plurality of intermediate disks therebetween, to be described, are mounted on a common axially extending shaft 48 extending longitudinally along axis 42 and supported on frame 14 . In other embodiments, each of disks 40 and 44 is mounted on its own separate shaft, and such intermediate disks are merely nested within each other along a virtual shaft, to be described. The various disks are preferably round, but may have other shapes. Cable end 36 is retained in slot or cavity 50 in disk 40 such that the latter is linked by cable 32 , pulley 34 and lever 28 to arm 20 of the training member, such that movement of training member arm 20 by the user in the noted arc about axis 22 rotates disk 40 about axis 42 tensioning and stretching coupling 46 along the noted spiral which is resisted by disk 44 . Disk 44 has a fixed, or at least resistive, rotational position about axis 42 , to be described. In the rest position, coupling 46 may or may not be in a spiral.

Coupling 46 has a first end 51 , FIG. 2 , coupled to first disk 40 , and a second end 52 coupled to second disk 44 . In one embodiment, coupling 46 is provided by a plurality of sets 54 , 56 , 58 , 60 , 62 , 64 of resiliently deformable stretchable bands wrapped in parallel about axis 42 . It is preferred that the bands be both functionally and geometrically in parallel about axis 42 . Each set has a plurality of stretchable bands extending end-to-end in series and wrapped around intermediate disks, to be described. For example, set 54 has stretchable bands 66 , 68 , 70 , 72 extending end-to-end in series, set 56 also has four stretchable bands extending end-to-end in series, and so on. The bands are connected to respective disks, to be described.

A plurality of intermediate disks 74 , FIGS. 2 , 3 , 6 , 7 , are provided between disks 40 and 44 . The intermediate disks include a first set of connection disks 76 , 78 , 80 axially spaced from each other and providing connection points for the ends of respective bands. For example, bands 68 and 70 , FIG. 3 , extend in series relation and are connected end-to-end in series connection at ends 82 and 84 at intermediate connection disk 78 . The ends of the bands have apertures therethrough for mounting on respective studs such as 86 and 88 , FIG. 6 , of a respective disk such as 78 , and are held thereon by an allen hex nut or the like such as 90 and 92 . Other ends of respective bands are connected to respective disks in like manner. The noted intermediate disks also include a plurality of sets 94 , 96 , 98 , 100 of spacer disks. Each set of spacer disks includes a plurality of disks such as 102 , FIG. 7 . The plurality of spacer disks 102 in set 94 are between disks 44 and 76 . The plurality of spacer disks 102 in set 96 are between intermediate disks 76 and 78 . The plurality of spacer disks 102 in set 98 are between intermediate disks 78 and 80 . The plurality of spacer disks 102 in set 100 are between disks 80 and 40 . For clarity, the spacer disks are not shown in FIG. 3 , and in FIG. 2 are only shown in the broken away portion thereof. In band set 54 , FIG. 2 , the lower end of band 72 is connected to disk 40 , and the upper end of band 66 is connected to disk 44 . The upper end of band 72 is coupled to the lower end of band 66 , either by direct connection thereto (in which case intermediate connection disk 78 and spacer disk sets 96 and 98 are eliminated), or by connection through an intermediate connection disk, or through one or more additional stretchable bands such as 70 , 68 in combination with one or more intermediate connections disks. The intermediate disks 74 are axially aligned with and axially interposed between the noted first and second disks 40 and 44 . The bands may be connected to respective disks as shown at a terminal end of a band, or alternatively the band may be looped around a respective connection such as 86 at any of disks 40 , 44 , 76 , 78 , 80 in serpentine manner, for example as shown at dashed line loop 103 .

An adjustment mechanism 104 , FIGS. 2 , 5 , is provided for adjustably controlling the position of disk 44 relative to the spiral to selectively increase or decrease spiral tension along coupling 46 to vary resistance to rotation of first disk 40 , and hence vary the resistance to upward curling of training member arm 20 and handles 24 , 26 . Adjustment mechanism 104 adjustably controls the rotational position of disk 44 about axis 42 . The adjustment mechanism includes a toothed gear 106 fixed to disk 44 and rotational therewith about axis 42 , and an adjustment gear 108 rotational about a second axis 110 transverse to axis 42 . Gear 106 is a toothed gear fixed to disk 44 by welding or by pins or bolts such as 112 or by a keyway such as 114 . Gear 108 is a worm gear having spiral teeth 116 engaging teeth 118 of gear 106 to rotate toothed gear 106 and disk 44 about axis 42 to change the rotational position of disk 44 about axis 42 relative to disk 40 . Worm gear 108 is mounted on a shaft 120 , FIG. 1 , supported on the frame, and may have an adjustment knob or dial face 122 with calibration or scale indicia. Disk 44 has a fixed, or at least resistive, rotational position about axis 42 relative to disk 40 . The adjustment mechanism adjustably controls the fixed or resistive rotational position of disk 44 about axis 42 to vary resistance to rotation of disk 40 .

It is recognized that various equivalents, alternatives and modifications are possible within the scope of the appended claims.