Patent ID: 11920633
Assignee: nan
Field: Machine tools (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 0:
1. A telescopic rod structure, comprising: at least two rods sequentially and telescopically connected in a vertical direction; the at least two rods are tubular; wherein a first rod of each two adjacent rods of the at least two rods having a smaller outer diameter is defined as an upper rod; a second rod of each two adjacent rods having a larger outer diameter is defined as a lower rod;
wherein the upper rod is of a stepped rod-shaped structure; the upper rod comprises a first rod body and a second rod body connected with the first rod body; the first rod body and the second rod body are arranged from top to bottom along the vertical direction; a diameter of the first rod body is less than a diameter of the second rod body; a rod stepped surface is formed between the first rod body and the second rod body; the rod stepped surface is annular; an outer wall of the second rod body defines a guide groove, and an extending direction of the guide groove is same as an axial direction of the second rod body;
the lower rod defines an inner hole; the inner hole is a stepped hole; the stepped hole comprises a first through hole and a second through hole communicated with the first through hole; the first through hole and the second through hole are arranged from top to bottom; a diameter of the first through hole is less than a diameter of the second through hole;
a hole stepped surface is formed between the first through hole and the second through hole; the hole stepped surface is annular; a rib matched with the guide groove is arranged on an inner wall of the second through hole; and the rib is slidably connected with the guide groove in the extending direction of the guide groove; the second rod body is sleeved in the second through hole; the first rod body upwards passes through the first through hole; the diameter of the first through hole is less than a diameter of the rod stepped surface, wherein a length of the guide groove is equal to the length of the second rod body, wherein a ratio of a length of the second rod body to a length of the first through hole is 3:1.