what are gear slots and gear dogs…..?
The inner tube 10 is provided in an outer wall with a series of gear slots 11, which are arranged at an interval along a longitudinal direction of the inner tube 10. The inner tube 10 is slidably fitted into the outer tube 20. The outer tube 20 is provided at one end with a through hole 21 corresponding in location to the gear slots 11 of the inner tube 10. The support frame 30 is mounted on the one end of the outer tube 20 and is provided with two lugs 31, each having a first shaft hole 01, a second shaft hole 02, and a third shaft hole 03. The first gear 41 is mounted on a first shaft 51 in conjunction with two shaft sleeves 53. The first fhaft 51 is mounted in the support frame 30 such that the first shaft 51 is fastened at both ends thereof with the first shaft holes 01 of the two lugs 31 of the support frame 30. The first gear 41 is engaged with the gear slots 11 of the inner tube 10. The second gear 42 is mounted on an actuating shaft 60 which is fastened at both ends with the se
