# US 7,611,448 B2 · Adjustable-weight exercise apparatus and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,448 B2 - Document ID: US7611448B2 - Status: Granted - Kind: B2 - Application number: 11/934,243 - Filed: 2007-11-02 - Published: 2009-05-07 - Granted: 2009-11-03 - Earliest claimed: 2007-11-02 - Inventors: Jon D. Schiff - Web page: https://patentgrep.com/patent/US7611448B2 ## CPC - A63B 21/0728: {with means for fixing weights on bars, i.e. fixing olympic discs or bumper plates on bar-bells or dumb-bells} - A63B 21/075: with variable weights {, e.g. weight systems with weight selecting means for bar-bells or dumb-bells} - A63B 21/072: Dumb-bells, bar-bells or the like {, e.g. weight discs having an integral peripheral handle} - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract An adjustable-weight exercise apparatus include a rod with opposing end sections defining bearing surfaces, a first shallow channel without ribs, and a second shallow channel with ribs. The weights each include a hub shaped to telescopingly slide onto ends of the rod. Each hub further includes opposing flexible fingers with tips configured to slide along the second shallow channel when in a first rotational orientation during assembly of the weights onto the rod, and configured to flex over a raised detent into engagement with the second shallow channel between the ribs when the weight is rotated. ## Claims ### Claim 1 An adjustable-weight exercise apparatus comprising: a rod with opposing end sections each having a transverse cross section defining first, second, and third longitudinally-extending surfaces positioned circumferentially, and a detent between the second and third longitudinally-extending surfaces; and a plurality of weights each having a hub defining a hole shaped to slide onto one of the opposing end sections; the hub including a bearing surface for slidably engaging the first longitudinally-extending surface and including at least one flexible finger with a tip extending radially inward within the hole, the flexible finger configured to slide along the second longitudinally-extending surface when in a first rotational orientation during assembly of the weights onto one of the end sections of the rod, and configured to flex over the detent and then interlockingly engage the third longitudinally-extending surface when the weight is rotated to thus lock the weights onto the rod; and wherein the at least one finger includes opposing fingers extending in opposite directions, and wherein the first, second and third longitudinally-extending surfaces of the rod include first, second and third opposing surfaces. ### Claim 2 (depends on 1) The apparatus defined in claim 1, wherein the first longitudinally-extending surface defines a cylindrical shape. ### Claim 3 (depends on 2) The apparatus defined in claim 2, wherein the second and third longitudinally-extending surfaces lie within the cylindrical shape. ### Claim 4 (depends on 3) The apparatus defined in claim 3, wherein the second and third longitudinally-extending surfaces each define a concave channel extending along the rod. ### Claim 5 (depends on 4) The apparatus defined in claim 4, wherein the third longitudinally-extending surface includes spaced apart ridges and the tip of the finger is shaped to fit between the ridges. ### Claim 6 (depends on 1) The apparatus defined in claim 1, wherein the rod includes a handle located between the end sections, and includes a flange between each end of the handle and the associated end section. ### Claim 7 (depends on 1) The apparatus defined in claim 1, wherein the rod includes a metal bar, and further includes an overmolded polymeric portion defining the first, second, and third longitudinally-extending surfaces. ### Claim 8 (depends on 1) The apparatus defined in claim 1, wherein the weights each include a metal plate and further include an overmolded polymeric portion defining the finger. ### Claim 9 (depends on 1) The apparatus defined in claim 1, wherein the apparatus includes only the rod and weights, and does not include a locking collar. ### Claim 10 (depends on 1) The apparatus defined in claim 1, wherein the weights include different masses. ### Claim 11 (depends on 1) The apparatus defined in claim 1, wherein the weights each have an undulated outer surface for gripping and to assist with rotational engagement onto the rod. ### Claim 12 (depends on 1) The apparatus defined in claim 1, wherein the weights and the rod are overmolded with different materials having a low coefficient of friction therebetween. ### Claim 13 (depends on 12) The apparatus defined in claim 12, wherein the weights are overmolded with an acetal polymer. ### Claim 14 (depends on 12) The apparatus defined in claim 12, wherein the rod is overmolded with a nylon material. ### Claim 15 (depends on 1) The apparatus defined in claim 1, wherein the at least one finger tip has a rounded surface configured to bias the weight rotationally off of the detent toward an assembly position where the finger engages the second longitudinally-extending surface or toward a locked position where the finger engages the third longitudinally-extending surface. ### Claim 16 (depends on 1) The apparatus defined in claim 1, wherein the at least one flexible finger includes a resiliently flexible root that connects the tip to the hub. ### Claim 17 (depends on 16) The apparatus defined in claim 16, wherein the root extends at an angle to a radial direction defined by the rod. ### Claim 18 (depends on 1) The apparatus defined in claim 1, wherein the weights are non-handed and are configured to fit onto the rod with either side of the weight positioned toward the rod.