Trolley bag chassis

Abstract

Disclosed is a trolley bag chassis, including a trolley chassis. Left and right sides of a lower portion of a rear wall surface of the trolley chassis are pivotally connected with bottom wheels via hinge shafts. A frame mounting groove is formed on the rear wall surface of the trolley chassis. A support frame is sleeved in the frame mounting groove and cooperates with the frame mounting groove. An upper portion of the support frame is pivotally connected to the trolley chassis via a hinge shaft. A support wheel is installed at a bottom of a vertical support tube of the support frame. The frame mounting groove includes left and right vertical grooves extending vertically. Wheel placement grooves are formed on the rear wall surface of the trolley chassis at bottom ends of the vertical grooves.

1 . A trolley bag chassis, comprising a trolley chassis, wherein left and right sides of a lower portion of a rear wall surface of the trolley chassis are pivotally connected with bottom wheels via hinge shafts, characterized in that: a frame mounting groove is formed on the rear wall surface of the trolley chassis; a support frame is sleeved in the frame mounting groove and cooperates with the frame mounting groove; an upper portion of the support frame is pivotally connected to the trolley chassis via a hinge shaft; a support wheel is installed at a bottom of a vertical support tube of the support frame;
 the frame mounting groove comprises left and right vertical grooves extending vertically; wheel placement grooves are formed on the rear wall surface of the trolley chassis at bottom ends of the vertical grooves, the wheel placement grooves communicating with the corresponding vertical grooves; an intermediate mounting groove is formed between the two vertical grooves; an upper groove is formed between upper portions of the two vertical grooves, with both ends of the upper groove, both ends of the intermediate mounting groove, and the two vertical grooves all communicating with one another; and   a gripping rod portion is arranged between the two vertical support tubes; two ends of the gripping rod portion are installed with movable blocks; the movable blocks are sleeved in the corresponding vertical support tubes; outer sidewalls of the movable blocks are adjacent to and cooperate with inner sidewalls of the vertical support tubes; the two ends of the gripping rod portion are inserted into vertically elongated through slots formed in middle portions of side plates of the two vertical support tubes facing each other.   
     
     
         2 . The trolley bag chassis according to  claim 1 , wherein a semicircular groove is formed on a front wall surface of an upper end of the vertical groove; an upwardly extending upper protruding positioning recessed hole is formed on an upper inner wall surface of the semicircular groove; a forwardly extending front protruding positioning recessed hole is formed on a front end wall surface of the semicircular groove;
 the support frame comprises two vertical support tubes with vertical through holes formed in their middle portions; the vertical support tubes are sleeved in the corresponding vertical grooves; a fixed sleeve body is sleeved over upper ends of the vertical support tubes; an inner sidewall of the fixed sleeve body closely adheres to an outer sidewall of an upper portion of the vertical support tube; hinge shafts are sleeved in corresponding through holes of left and right side plates of a middle portion of the fixed sleeve body and left and right side plates of the upper portion of the vertical support tube; both ends of the hinge shafts extend outward from left and right outer sidewalls of the fixed sleeve body and are pivotally connected to left and right side walls of the corresponding vertical groove; and   a limiting column is sleeved in the upper portion of the vertical support tube; a positioning portion fixed or formed at an upper end of the limiting column extends beyond upper ends of the vertical support tube and the fixed sleeve body and is sleeved in the upper protruding positioning recessed hole; a lower outer sidewall of the positioning portion closely adheres to a top inner sidewall of the corresponding vertical support tube; a movable block is sleeved in the vertical support tube below the limiting column; an upper vertical rod is fixed to a top surface of the movable block; and a top end of the upper vertical rod is fixed to a bottom end of the limiting column.   
     
     
         3 . The trolley bag chassis according to  claim 2 , wherein a vertical connecting rod is fixed to a bottom of the movable block, a lower lifting head is fixed to a bottom end of the vertical connecting rod, a vertical guide plate is fixed to a bottom end of the lower lifting head, and a bottom surface of the vertical guide plate is an inclined wall surface; an adjustment limiting column is fixed to an inner sidewall of the vertical support tube below the lower lifting head, an insertion slot extending downward is formed in a central portion of a top surface of the adjustment limiting column, a lower positioning block is fixed to a bottom surface of the adjustment limiting column, the lower positioning block is sleeved in the vertical support tube, a lateral insertion hole extending inward horizontally is formed on an outer sidewall of the lower positioning block, a lower insertion slot is formed in a central portion of a top surface of the lower positioning block, the lower insertion slot communicates with and corresponds to the insertion slot, and a lateral positioning block is sleeved in the lateral insertion hole; a guide insertion hole is formed on a top surface of the lateral positioning block, an inner sidewall surface of the guide insertion hole is an inclined wall surface extending inward and downward, the vertical guide plate is sleeved in the insertion slot and the lower insertion slot, a lower portion of the vertical guide plate is adjacent to or closely adhered to front and rear inner sidewalls of the lower insertion slot, a bottom portion of the vertical guide plate is sleeved in the guide insertion hole, and the bottom surface of the vertical guide plate is an inclined wall surface tightly adhered to and cooperating with the inclined wall surface of the guide insertion hole; a lateral spring is sleeved in the lateral insertion hole, an end of the lateral spring abuts against an inner end surface of the lateral insertion hole, an opposite end of the lateral spring is sleeved in an insertion hole at an inner end of the lateral positioning block and abuts against an inner end surface of the insertion hole, a lateral positioning portion is formed on a central portion of an outer end surface of the lateral positioning block, the lateral positioning portion is sleeved in a through hole of a wall plate on an outer side of the vertical support tube, and an outer end of the lateral positioning portion is sleeved in a positioning recessed hole formed on a side wall of the corresponding vertical groove. 
     
     
         4 . The trolley bag chassis according to  claim 3 , wherein a protruding positioning portion is formed on a left or right sidewall of a middle portion of the vertical guide plate, and an elastic bent limiting portion is formed on a left or right sidewall of an upper portion of the insertion slot of the adjustment limiting column, with a bottom end of the elastic bent limiting portion abutting against a top end of the corresponding protruding positioning portion. 
     
     
         5 . The trolley bag chassis according to  claim 1 , wherein downwardly extending blocking portions are formed on rear portions of top surfaces at both ends of the upper groove, and the blocking portions are located behind left or right portions of the gripping rod portion to block the left or right portions of the gripping rod portion. 
     
     
         6 . The trolley bag chassis according to  claim 5 , wherein a middle portion of the gripping rod portion is a horizontally extending gripping portion, upwardly inclined extending connection portions are formed at both ends of the horizontally extending gripping portion, and connection portions formed at ends of the inclined extending connection portions are sleeved in the corresponding elongated through slots and fixed to the corresponding movable blocks. 
     
     
         7 . The trolley bag chassis according to  claim 1 , wherein a guide protruding portion is formed on a middle portion of a front or rear sidewall of the insertion slot, the guide protruding portion is sleeved in a vertical main guide through slot formed in a middle portion of the vertical guide plate, and left and right sidewalls of the guide protruding portion closely adhere to corresponding left and right sidewalls of the vertical main guide through slot.