Adjustable dumbbell grip structure

Abstract

An adjustable dumbbell grip, comprising a central tube, internal parts, external parts, a first screw shaft and a second screw shaft; a central rod is provided inside the central tube; the internal parts are two and each internal part is respectively provided on a side of the central tube; the internal parts are connected to the central tube via a plurality of fastening pieces, a plurality of insert blocks are provided on the fastening pieces; by rotating the central tube and screw shaft structure, the first screw shaft and the second screw shaft disposed on two ends of the assembly extend outwards, so weight plates can be placed on the screw shafts. Meanwhile, by moving pins, semicircular weight plates can be attached, making it easy to increase or reduce weights with weight plates, semicircular weight plates and initial weight plates, and the assembly is easy to use, adjust and maintain.

1 . An adjustable dumbbell grip structure, comprising a central tube, internal parts, external parts, a first screw shaft and a second screw shaft, wherein a central rod is provided inside the central tube; the internal parts are arranged to be two and each of the internal parts is respectively provided on a side of the central tube; the internal parts are connected to the central tube via a plurality of fastening pieces, a plurality of insert blocks are provided on the plurality of fastening pieces, and the internal parts, the plurality of fastening pieces and the central tube are sequentially and fixedly connected by the plurality of insert blocks; a digital ring is sleeved onto an outside portion of each of the internal parts, a plurality of gears are provided inside the digital ring, a plurality of slots for allowing the plurality of gears rotating are provided on each of the internal parts; the external parts are provided to be two and correspond to the internal parts; a toothed ring engaging with the plurality of gears is provided in each of the external parts; the first screw shaft and the second screw shaft pass the internal parts and the external parts and are provided inside the central tube, fixing plates are provided on both the first screw shaft and the second screw shaft, and both the first screw shaft and the second screw shaft are internally hollow and sleeved onto the central rod, cross sections of both the first screw shaft and the second screw shaft are a semicircle, inner openings in the fixing plates are also a semicircle, the inner openings in the fixing plates correspond to grooves provided on both ends of the central rod and in the meantime the first screw shaft and the second screw shaft; threads are provided on both the first screw shaft and the second screw shaft, and the threads engage with the insert blocks. 
     
     
         2 . The adjustable dumbbell grip structure of  claim 1 , wherein pins are provided in the external parts, cam portions are provided in the internal parts, and the pins engage with the cam portion. 
     
     
         3 . The adjustable dumbbell grip structure of  claim 1 , wherein gear plates are provided in the internal parts, the cam portions of the internal parts correspond to inner openings of the gear plates, a plurality of round holes are provided on each of the gear plates, and the plurality of round holes are arranged more than two. 
     
     
         4 . The adjustable dumbbell grip structure of  claim 3 , wherein springs and balls are provided in the external parts, one end of each of the springs is attached in the external parts, and another end of each of the springs is compressed against each of the balls via each of the gear plate respectively. 
     
     
         5 . The adjustable dumbbell grip structure of  claim 4 , wherein initial weight plates are installed on the external parts via bolts.