# US 6,293,892 B1 · Self-spotting apparatus for free-weights > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,293,892 B1 - Document ID: US6293892B1 - Status: Granted - Kind: B1 - Application number: 09/385,241 - Filed: 1999-08-28 - Granted: 2001-09-25 - Earliest claimed: 1999-08-28 - Assignees: Prospot, Inc. - Inventors: Michael D. Slawinski; Mikael L. E. Olsson - Web page: https://patentgrep.com/patent/US6293892B1 ## CPC - A63B 21/00181: {comprising additional means assisting the user to overcome part of the resisting force, i.e. assisted-active exercising} - A63B 21/0783: {Safety features for bar-bells, e.g. drop limiting means} - A63B 21/152: {Bowden-type cables} - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract A self-spotting apparatus for free-weights (101) provides two cable assemblies (107A, 107B) with one end of each cable assembly attached to a free-weight assembly (115) and the opposite end attached to respective linear weight-support assemblies (123A, 123B) via respective weight-responsive engagement blocks (125A, 125B). Guide rods (127A, 127B) allow vertical motion of the engagement blocks and maintain engagement orientation relative to the support assemblies. The engagement blocks engage the respective support assemblies for static support of the free-weight assembly. Lifting of the substantial weight of the free-weight assembly and activation of disengagement bias is required to disengage the engagement blocks from the respective support assemblies to allow free motion of the free-weight assembly. The apparatus provides self-spotting for barbells (115) and dumbbells (247A). ## Claims ### Claim 1 A self-spotting apparatus for us in connection with a free-weight assembly, the apparatus comprising: a support stand; a first linear weight-support assembly and a second linear weight-support assembly attached to the support stand; a first cable assembly comprising a first end attachable to the free-weight assembly, and a second end engageable to the first weight-support assembly by a first weight-responsive engagement assembly linearly displaceable along the first weight-support assembly, the first weight-support assembly providing support to the free-weight assembly against gravity when the first weight-responsive engagement assembly is engaged to the first weight-support assembly; a second cable assembly comprising a first end attachable to the free-weight assembly, and a second end engageable to the second weight-support assembly by a second weight-responsive engagement assembly linearly displaceable along the second weight-support assembly, the second weight-support assembly providing support to the free-weight assembly against gravity when the second weight-responsive engagement assembly is engaged to the second weight-support assembly; the first weight-responsive engagement assembly comprising a means for disengaging the first weight-responsive engagement assembly from the first weight-support assembly when a user provides lift support of a substantial portion of the weight of the free-weight assembly. ### Claim 2 (depends on 1) The self-spotting apparatus of claim 1 wherein the first weight-responsive engagement assembly comprises a first pawl lock-engagable to the first weight-support assembly by a lock force, a substantial portion of the lock force provided by the weight of the free-weight assembly transferred to the first weight-responsive engagement assembly by the first cable assembly. ### Claim 3 (depends on 2) The self-spotting apparatus of claim 2 wherein the first weight-support assembly comprises a first chain portion and the weight of the free-weight assembly lock-engages the first pawl against a first link of the first chain portion when the first link is engageably supported by a backing plate of the first weight-responsive engagement assembly. ### Claim 4 (depends on 2) The self-spotting apparatus of claim 2 wherein the first weight-responsive engagement assembly comprises a first solenoid which biases the first pawl to disengage the first weight-support assembly when energized and a first spring which biases the first pawl to engage the first weight-support assembly. ### Claim 5 (depends on 4) The self-spotting apparatus of claim 4 wherein the first solenoid is responsive to a first actuator and a second actuator on the free-weight assembly whereby release of either of said first actuator or said second actuator de-energizes the first solenoid to engage the first pawl to the first weight-support assembly. ### Claim 6 (depends on 1) The self-spotting apparatus of claim 1 wherein the first weight-support assembly comprises a first chain loop supported in a vertical orientation by a first upper sprocket and a first lower sprocket, the first chain loop engagable to the first weight-responsive engagement assembly. ### Claim 7 (depends on 6) The self-spotting apparatus of claim 6 comprising a rotary positioner fixed to the support stand, the first lower sprocket attached to a shaft of the rotary positioner whereby the rotary positioner raises and lowers the free-weight assembly when the rotary positioner is actuated and the first weight-responsive engagement assembly is engaged to the first chain loop. ### Claim 8 (depends on 6) The self-spotting apparatus of claim 6 wherein the first weight-support assembly comprises a second chain loop supported in a vertical orientation by a second upper sprocket and a second lower sprocket. ### Claim 9 (depends on 1) The self-spotting apparatus of claim 1 wherein the first weight support assembly comprises a linear ratchet engagable to the first weight-responsive engagement assembly. ### Claim 10 (depends on 9) The self-spotting apparatus of claim 9 wherein the first weight-responsive engagement assembly comprises a latch element solenoid biasing a latch element towards disengagement with the linear ratchet and a latch element spring biasing the latch element towards engagement with the linear ratchet. ### Claim 11 (depends on 1) The self-spotting apparatus of claim 1 comprising a first linear guide attached to the support stand and the first weight-responsive engagement assembly comprises a linear guide follower engaged to the first linear guide. ### Claim 12 (depends on 1) The self-spotting apparatus of claim 1 comprising a first sheave supporting the first cable assembly between the first end and the second end, the first sheave attached to the support stand and disposed above an uppermost position of the first weight-responsive engagement assembly. ### Claim 13 (depends on 2) The self-spotting apparatus of claim 2 wherein said first sheave is attached to a first support boom on a frame of the support stand, the first support boom attached to the frame by a pivot whereby the first support boom pivots in a horizontal plane. ### Claim 14 (depends on 1) The self-spotting apparatus of claim 1 wherein the first cable assembly comprises a first load-carrying cable providing an operable electrical connection between an engagement element operator on the first weight-responsive engagement assembly and a first cable assembly electrical connector connectable to a first actuator on the free-weight assembly. ### Claim 15 (depends on 14) The self-spotting apparatus of claim 14 wherein the first actuator is a pressure-sensitive switch. ### Claim 16 (depends on 14) The self-spotting apparatus of claim 14 wherein the first actuator is a touch-sensitive sensor. ### Claim 17 (depends on 1) The self-spotting apparatus of claim 1 wherein the first cable assembly comprises a first cable and a second cable disposed in a parallel arrangement, the first cable assembly operably connected to the first weight-responsive engagement assembly so that a substantial portion of free-weight assembly weight transferred by the first cable assembly to the first weight-responsive engagement assembly is carried by the first cable. ### Claim 18 A self-spotting apparatus for use in connection with a free-weight assembly, the apparatus comprising: a support stand; a first weight-support assembly attached to the support stand; a first cable assembly comprising a first end attachable to the free-weight assembly, and a second end attached to the first weight-support assembly by a first weight-responsive engagement assembly engagable to the first weight support assembly and linearly displaceable along a first linear guide attached to the support stand, the first cable assembly and the first weight-support assembly providing vertical support to the free-weight assembly against gravity when the first weight-responsive assembly is engaged to the first weight-support assembly; the first weight-responsive engagement assembly comprising a means for disengaging the first weight-responsive engagement assembly from the first weight-support assembly when a user provides lift support of a substantial portion of the weight of the free-weight assembly. ### Claim 19 (depends on 18) The self-spotting apparatus of claim 18 wherein the first weight-support assembly comprises a first chain loop, and the first weight-responsive engagement assembly comprises a pawl lock-engagable with a link of the first chain loop when the first weight-responsive engagement assembly is biased in a lock-engagement direction by the weight of the free-weight assembly, and wherein a lift force sufficient to allow motion of the first weight-responsive engagement assembly in a direction opposite of the lock-engagement direction is required to allow full disengagement of the pawl from the link of the first chain loop. ### Claim 20 (depends on 19) The self-spotting apparatus of claim 19 comprising a pawl solenoid providing disengaging bias on the pawl when energized and a first cable of the first cable assembly providing an electrical connection to a solenoid actuator on the free-weight assembly. ### Claim 21 (depends on 19) The self-spotting apparatus of claim 19 wherein the first cable assembly comprises a first cable and a second cable disposed in a parallel arrangement and wherein said first cable and said second cable are operably connected to the first weight-responsive engagement assembly so that a substantial portion of free-weight assembly weight transferred by the first cable assembly to the first weight-responsive engagement assembly is carried by the first cable. ### Claim 22 (depends on 18) The self-spotting apparatus of claim 18 wherein the first weight-support assembly comprises a first linear ratchet, and the first weight-responsive engagement assembly comprises a pawl lock-engagable with a tooth of the first linear ratchet when the first weight-responsive engagement assembly is biased in a lock-engagement direction by the weight of the free-weight assembly, and wherein a lift force sufficient to allow motion of the first weight-responsive engagement assembly in a direction opposite of the lock-engagement direction is required to allow full disengagement of the pawl from the tooth of the first linear ratchet. ### Claim 23 (depends on 22) The self-spotting apparatus of claim 22 comprising a pawl solenoid providing disengaging bias on the pawl when energized and a first cable of the first cable assembly providing an electrical connection to a solenoid actuator on the free-weight assembly. ### Claim 24 (depends on 22) The self-spotting apparatus of claim 22 wherein the first cable assembly comprises a first cable and a second cable disposed in a parallel arrangement and wherein said first cable and said second cable are operably connected to the first weight-responsive engagement assembly so that the substantial portion of free-weight assembly weight transferred by the first cable assembly to the first weight-responsive engagement assembly is carried by the first cable. ### Claim 25 (depends on 18) The self-spotting apparatus of claim 18 wherein the first weight-responsive engagement assembly comprises a first engagement element and the first cable assembly comprises a conductor operably connecting the engagement element on the weight-responsive engagement assembly to an engagement element actuator on the free-weight assembly whereby the combination of a user actuating the engagement element actuator and providing lift support of a substantial portion of the weight of the free-weight assembly disengages the first weight-responsive engagement assembly from the first weight-support assembly to allow downward motion of the free-weight assembly unrestrained by the weight-support assembly. ### Claim 26 (depends on 25) The self-spotting apparatus of claim 25 wherein the engagement element is a pawl connected operably to a solenoid and the engagement element actuator is a solenoid actuator mounted on the free-weight assembly. ### Claim 27 A self-spotting apparatus for use with a free-weight assembly, the apparatus comprising: a support stand; a first cable assembly comprising a first cable and a second cable in a parallel arrangement, the first cable comprising a first end attachable to the free-weight assembly and a second end operably attached to the support stand and the second cable comprising a first end attachable to the fee-weight assembly and a second end operably attached to the support stand through a clearance defined by a load transfer element disposed on the second end of the second cable and a load element receptor operably attached to the support stand. ### Claim 28 (depends on 27) The self-spotting apparatus of claim 27 wherein the clearance is provided by a second cable length greater than the first cable length. ### Claim 29 (depends on 27) The self-spotting apparatus of claim 27 comprising a second cable assembly comprising a third cable and a fourth cable in a parallel arrangement, the second cable assembly comprising a first end attachable to the free-weight assembly and a second end operably attached to the support stand so that the third cable provides a substantial portion of a force transferred from the free-weight assembly to the support stand by the second cable assembly. ### Claim 30 A self-spotting apparatus for use in connection with a free-weight assembly, the apparatus comprising: a support stand; a first linear weight-support assembly attached to the support stand; the free-weight assembly supportable by the first linear weight-support assembly through a first weight-responsive engagement assembly comprising a first lock element comprising a shape that is lock-engagable to the first linear weight-support assembly in a first direction defined by support of the free weight against gravity and disengagable from the first linear weight-support assembly in a second direction opposite of the first direction by a combination of a first disengagement force provided by a first disengagement actuator actuated by an operator and simultaneous support of a substantial portion of the weight of the free-weight assembly by the operator. ### Claim 31 (depends on 30) The self-spotting apparatus of claim 30 wherein the free-weight assembly is supportable by a combination of the first linear weight-support assembly and a second linear weight-support assembly, the second linear weight-support assembly providing support through a second weight-responsive engagement assembly comprising a second lock element comprising a shape that is lock-engagable to the second linear weight support assembly in the first direction defined by support of the free weight against gravity and disengagable from the second linear weight-support assembly in the second direction opposite of the first direction by a combination of a second disengagement force provided by a second disengagement actuator actuated by the operator and simultaneous support of the substantial portion of the weight of the free-weight assembly by the operator. ### Claim 32 (depends on 30) The self-spotting apparatus of claim 30 wherein the first linear weight support assembly is a first chain comprising a plurality of links, and the first lock element is a first pawl engageable with said plurality of links. ### Claim 33 (depends on 30) The self-spotting apparatus of claim 30 wherein the first linear weight support assembly is a first linear ratchet bar comprising a plurality of ratchet teeth, and the first lock element is a first pawl engageable with said plurality of ratchet teeth. ### Claim 34 (depends on 30) The self-spotting apparatus of claim 30 wherein the first disengagement actuator is a first solenoid actuator operably connected to the first pawl. ### Claim 35 (depends on 34) The self-spotting apparatus of claim 34 wherein the first solenoid is actuated by a free-weight actuator disposed on the free-weight assembly.