Fitness apparatus

Abstract

A fitness apparatus for adjustable resistance training includes a handle and one or two weight assemblies, configured as a kettlebell, dumbbell, or barbell. Each weight assembly comprises a housing fixedly connected to the handle, a pin movably connected to the housing, and a plurality of stacked weights adapted to fit within the housing. The pin selectively engages one weight, allowing precise weight adjustment. When the handle lifts the housing, the selected weight and all weights above are lifted together. In a kettlebell embodiment, a single weight assembly is attached to the handle. In a dumbbell embodiment, two weight assemblies are fixed to opposite ends of the handle. In a barbell embodiment, the handle comprises two detachably connected rods, each rod with a weight assembly at its free end. This configuration allows users to easily adjust the resistance by selecting different weights through the pin, accommodating various fitness levels.

What is claimed is: 
     
         1 . A fitness apparatus comprising:
 a handle; and   a weight assembly comprising:
 a housing fixedly connected to the handle; 
 a pin movably connected to the housing; and 
 a plurality of weights, 
 wherein when the plurality of weights are arranged in stack and accommodated in the housing, the pin is configured for selectively positioning a weight of the plurality of weights to the housing, and when the housing is lifted by the handle, the weight and weights of the plurality of weights above the weight are lifted therewith. 
   
     
     
         2 . The fitness apparatus of  claim 1 , wherein a first mounting hole and a second mounting hole are formed on an exterior surface of the housing, the handle comprises a first end and a second end, the first end is inserted into the first mounting hole and fixed to the housing, the second end is inserted into the second mounting hole and fixed to the housing. 
     
     
         3 . The fitness apparatus of  claim 1 , wherein the housing comprises a coupling plate, each of the plurality of weights comprises a coupling slot, the coupling plate is insertable into the coupling slots of the plurality of weights arranged in stack, the coupling plate comprises a plurality of first pin holes, each of the plurality of weights comprises a second pin hole, the pin is insertable into the second pin hole of a selected weight of the plurality of weights and a corresponding first pin hole of the plurality of first pin holes that is aligned with the second pin hole to position the selected weight to the housing. 
     
     
         4 . The fitness apparatus of  claim 3 , wherein the coupling plate further comprises a rail groove, each of the plurality of weights further comprises a protrusion in the coupling slot, the protrusion is insertable into the rail groove and slidable along the rail groove. 
     
     
         5 . The fitness apparatus of  claim 3 , wherein the housing further comprises a roof and a sidewall perpendicular to each other, and the coupling plate is perpendicularly fixed to the roof and the sidewall, the sidewall extends laterally to form two flanges, each of the two flanges is shaped to conform to an outer profile of a stack of the plurality of weights. 
     
     
         6 . The fitness apparatus of  claim 5 , wherein each of the two flanges comprises a marking area on an exterior surface of the flange, the marking area displays weight values, each of the weight values corresponds to a weight of the plurality of weights stacked in the housing and indicates a cumulative weight of the weight and weights of the plurality of weights above the weight. 
     
     
         7 . The fitness apparatus of  claim 1 , wherein each of the plurality of weights comprises a positioning recess and a positioning projection on opposite sides of the weight, the positioning projection of one weight of the plurality of weights is insertable into the positioning recess of an adjacent weight of the plurality of weights to align each pair of adjacent weights of the plurality of weights in a stacked arrangement. 
     
     
         8 . A fitness apparatus comprising:
 a handle comprising a first end and a second end; and   two weight assemblies respectively fixed to the first end and the second end,   wherein each of the two weight assemblies comprises:
 a housing fixedly connected to the first end or the second end; 
 a pin movably connected to the housing; and 
 a plurality of weights, 
   when the plurality of weights are arranged in stack and accommodated in the housing, the pin is configured for selectively positioning a weight of the plurality of weights to the housing, and when the housing is lifted by the handle, the weight and weights of the plurality of weights above the weight are lifted therewith.   
     
     
         9 . The fitness apparatus of  claim 8 , wherein the housing comprises a coupling plate, each of the plurality of weights comprises a coupling slot, the coupling plate is insertable into the coupling slots of the plurality of weights arranged in stack, the coupling plate comprises a plurality of first pin holes, each of the plurality of weights comprises a second pin hole, the pin is insertable into the second pin hole of a selected weight of the plurality of weights and a corresponding first pin hole of the plurality of first pin holes that is aligned with the second pin hole to position the selected weight to the housing. 
     
     
         10 . The fitness apparatus of  claim 9 , wherein the coupling plate further comprises a rail groove, each of the plurality of weights further comprises a protrusion in the coupling slot, the protrusion is insertable into the rail groove and slidable along the rail groove. 
     
     
         11 . The fitness apparatus of  claim 9 , wherein the housing further comprises a roof and a sidewall perpendicular to each other, and the coupling plate is perpendicularly fixed to the roof and the sidewall, the sidewall extends laterally to form two flanges, each of the two flanges is shaped to conform to an outer profile of a stack of the plurality of weights. 
     
     
         12 . The fitness apparatus of  claim 11 , wherein each of the two flanges comprises a marking area on an exterior surface of the flange, the marking area displays weight values, each of the weight values corresponds to a weight of the plurality of weights stacked in the housing and indicates a cumulative weight of the weight and weights of the plurality of weights above the weight. 
     
     
         13 . The fitness apparatus of  claim 11 , wherein the sidewall comprises a mounting hole on its exterior surface, the first end or the second end is inserted into the mounting hole and fixed to the housing. 
     
     
         14 . The fitness apparatus of  claim 8 , wherein each of the plurality of weights comprises a positioning recess and a positioning projection on opposite sides of the weight, the positioning projection of one weight of the plurality of weights is insertable into the positioning recess of an adjacent weight of the plurality of weights to align each pair of adjacent weights of the plurality of weights in a stacked arrangement. 
     
     
         15 . The fitness apparatus of  claim 8  further comprising a base, wherein the base comprises a baseplate, the baseplate is configured for supporting the two weight assemblies, the baseplate forms barriers on the baseplate, the barriers are configured for positioning the two weight assemblies to the baseplate. 
     
     
         16 . A fitness apparatus comprising:
 a handle comprising a first rod and a second rod detachably connected, wherein an end of the first rod away from the second rod is defined as a first end, an end of the second rod away from the first rod is defined as a second end; and   two weight assemblies respectively fixed to the first end and the second end,   wherein each of the two weight assemblies comprises:
 a housing fixedly connected to the first end or the second end; 
 a pin movably connected to the housing; and 
 a plurality of weights, 
   when the plurality of weights are arranged in stack and accommodated in the housing, the pin is configured for selectively positioning a weight of the plurality of weights to the housing, and when the housing is lifted by the handle, the weight and weights of the plurality of weights above the weight are lifted therewith.   
     
     
         17 . The fitness apparatus of  claim 16 , wherein the housing comprises a coupling plate, each of the plurality of weights comprises a coupling slot, the coupling plate is insertable into the coupling slots of the plurality of weights arranged in stack, the coupling plate comprises a plurality of first pin holes, each of the plurality of weights comprises a second pin hole, the pin is insertable into the second pin hole of a selected weight of the plurality of weights and a corresponding first pin hole of the plurality of first pin holes that is aligned with the second pin hole to position the selected weight to the housing. 
     
     
         18 . The fitness apparatus of  claim 17 , wherein the coupling plate further comprises a rail groove, each of the plurality of weights further comprises a protrusion in the coupling slot, the protrusion is insertable into the rail groove and slidable along the rail groove. 
     
     
         19 . The fitness apparatus of  claim 17 , wherein the housing further comprises a roof and a sidewall perpendicular to each other, and the coupling plate is perpendicularly fixed to the roof and the sidewall, the sidewall extends laterally to form two flanges, each of the two flanges is shaped to conform to an outer profile of a stack of the plurality of weights. 
     
     
         20 . The fitness apparatus of  claim 16 , wherein each of the plurality of weights comprises a positioning recess and a positioning projection on opposite sides of the weight, the positioning projection of one weight of the plurality of weights is insertable into the positioning recess of an adjacent weight of the plurality of weights to align each pair of adjacent weights of the plurality of weights in a stacked arrangement.