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CN-121990031-A - Foldable handcart frame

CN121990031ACN 121990031 ACN121990031 ACN 121990031ACN-121990031-A

Abstract

The invention discloses a foldable handcart frame, which comprises two frames, two side crossing mechanisms and an underframe part. The frame comprises a bottom piece and two telescopic rods. The side crossing mechanism comprises at least two scissor units, the at least two scissor units are hinged end to end, the hinge of the inner lower end is a lower hinge part, and the lower hinge parts corresponding to the side crossing mechanisms are connected with a lower cross rod. The underframe part comprises two underframes with inner sides hinged together, the outer sides of the two underframes are respectively hinged to the two frames, and the underframe part in an open state is supported against the bottom cross bar. The side cross mechanism is provided with two outer lower ends and two outer upper ends, the outer lower ends of the side cross mechanism are hinged to the bottom piece or the lower rod of the frame, the outer upper ends of the side cross mechanism and the upper rod form a rotatable connection, and the rotation axis is located right above the telescopic rod or penetrates through the upper rod. The folding device has the advantages of saving connecting rods in the background technology, reducing production cost and effectively avoiding the risk of clamping hands during folding.

Inventors

  • HUANG CHANGJIU

Assignees

  • 鹭谱达（厦门）户外用品有限公司

Dates

Publication Date
20260508
Application Date
20260331

Claims (10)

  1. 1. The foldable handcart frame comprises two frames, two side crossing mechanisms and an underframe part, wherein the two frames are arranged at intervals along a first direction, the frames comprise a bottom part and two telescopic rods, the telescopic rods are provided with lower rods and upper rods, the bottom parts are fixedly connected with the lower rods, one side crossing mechanism is connected between the telescopic rods on the same side of the two frames, the two side crossing mechanisms are arranged at intervals along a second direction, the second direction and the first direction are vertically arranged, the side crossing mechanism comprises at least two scissor units, the at least two scissor units are hinged head and tail, the lower ends of the at least two scissor units are hinged to form a lower hinge part, the lower hinge parts corresponding to the two side crossing mechanisms are connected with a lower cross rod, the underframe part comprises two underframes, the inner sides of the two underframes are hinged to each other and can change between an open state or a folding state, the outer sides of the two underframe parts in the open state are respectively hinged to the two frameworks, the underframe part in the open state is propped against the lower cross rod, the side crossing mechanism is provided with two outer lower ends and two outer upper ends, the outer lower ends of the side crossing mechanism are hinged to the bottom parts of the frame or the lower rods, the corresponding to the upper ends of the two scissor units are hinged to the corresponding upper ends of the lower rods, and the upper ends of the side crossing mechanisms can pass through the upper telescopic rods or the upper shafts to rotate.
  2. 2. The foldable trolley frame as claimed in claim 1, wherein the top end of the upper rod is fixedly provided with a fixing seat, the fixing seat is provided with a connecting hole penetrating along the second direction, the outer upper ends of the two-side crossing mechanisms are connected with an upper cross rod, and the upper cross rod is connected in the connecting hole and is positioned right above the telescopic rod, so that the outer upper ends of the side crossing mechanisms and the upper rod form rotatable connection.
  3. 3. The foldable cart frame of claim 2, wherein the upper cross bar is rotatably connected in the connecting hole, and the upper cross bar is fixedly connected between the outer upper ends of the two-side crossing mechanisms.
  4. 4. The foldable trolley frame of claim 2, wherein the upper cross rod is fixedly connected in the connecting hole, two end parts of the upper cross rod extend out of the connecting hole, a rotating sleeve is fixedly arranged at the tail end of the upper cross rod, and the rotating sleeve can be rotatably sleeved at the tail end of the upper cross rod.
  5. 5. The foldable trolley frame of claim 2, wherein the upper cross rod is rotatably connected in the connecting hole, two end parts of the upper cross rod extend out of the connecting hole, and a rotating sleeve is fixedly arranged at the tail end of the upper cross rod and can be rotatably sleeved at the tail end of the upper cross rod.
  6. 6. The foldable cart frame of claim 1, wherein a first pivot is provided through the outer lower end of the side cross mechanism, the lower bar and the chassis to hingedly connect the side cross mechanism and the frame, and to hingedly connect the frame and the chassis.
  7. 7. The foldable cart frame of claim 6, wherein the chassis and the outer lower ends of the side cross mechanisms are disposed inside and outside the lower bar, respectively, and the first pivot is connected to the bottom of the lower bar.
  8. 8. The foldable cart frame of claim 1, wherein the two ends of the lower cross bar are provided with second pivots in a protruding manner, and the second pivots penetrate through the inner lower ends of the two scissor units to hinge the inner lower ends of the two scissor units end to end.
  9. 9. Foldable trolley frame according to any one of claims 1 to 8, characterized in that the scissor units of the side crossing mechanism are provided in two, the hinge on the inside of the two chassis in the open state being braced against the bottom rail.
  10. 10. The foldable cart frame according to any one of claims 1 to 8, wherein an attachment portion is fixedly provided to the chassis, the attachment portion being connected with casters, and one of the two frames being connected with a pull handle assembly.

Description

Foldable handcart frame Technical Field The invention relates to the technical field of trolleys, in particular to a foldable trolley frame. Background Existing trolley frames, such as US8011686B2, include a folding frame having a folded state and an unfolded state. The folding frame comprises two vertical frames which are arranged at intervals in the front-back direction, two side crossing mechanisms which are arranged at intervals in the left-right direction and a bottom frame component. The frame comprises a bottom rod and two lower rods fixedly connected to the bottom rod. The underframe part comprises two end-to-end hinged underframes, and the outer sides of the two underframes are respectively and rotatably connected to the lower parts of the two lower rods. The lower rods on the same side of the two frames are connected with a side crossing mechanism, the side crossing mechanism comprises two scissor units connected end to end, the inner ends of the two scissor units are hinged with each other (the two inner upper ends are hinged, the two inner lower ends are hinged), and the hinged positions of the two inner lower ends are connected with a lower cross rod. The two outer lower ends of the side crossing mechanism are respectively hinged to the lower parts of the two lower rods of the frame, and the two outer upper ends are fixedly connected with an upper cross rod. The first connecting rod and the second connecting rod are arranged, the inner end of the first connecting rod is rotationally connected to the outer upper part of the side crossing mechanism, the middle part of the first connecting rod is rotationally connected to the upper part of the lower rod, the outer end of the first connecting rod stretches out to form a pulling part for a user to pull by hand, so that the lower rod, the first connecting rod and the first scissor unit are matched into a first four-bar mechanism, the inner end of the second connecting rod is rotationally connected to the outer upper part of the side crossing mechanism, the outer end of the second connecting rod is rotationally connected to the upper part of the lower rod, so that the lower rod, the second connecting rod and the second scissor unit are matched into a second four-bar mechanism, and the two four-bar mechanisms are linked. The two frames are far away, the two upper cross bars are respectively supported on the first connecting rod and the second connecting rod, the hinged parts of the two underframes are supported on the lower cross bars, and the folding frame is in an open state. The first connecting rod and the second connecting rod are additionally arranged, so that the rod piece is increased, the cost is increased, and a user can easily clamp the hand during use, so that the hidden danger of use exists. Disclosure of Invention The invention provides a foldable handcart frame, which overcomes the defects of the handcart frame in the background technology. The foldable handcart frame comprises two frames, two side crossing mechanisms and a bottom frame part, wherein the two frames are arranged at intervals along a first direction, the frames comprise a bottom piece and two telescopic rods, the telescopic rods are provided with lower rods and upper rods, the bottom piece is fixedly connected with the lower rods, one side crossing mechanism is connected between the telescopic rods on the same side of the two frames, the two side crossing mechanisms are arranged at intervals along a second direction, the second direction and the first direction are vertically arranged, the side crossing mechanism comprises at least two scissor units, at least two scissor units are hinged end to end, the hinge joint of the inner lower ends is a lower hinge joint, the lower hinge joint corresponding to the two side crossing mechanisms is connected with a lower cross rod, the bottom frame part comprises two bottom frames, the inner sides of the two bottom frames are hinged and can change between an opened state or a folded state, the outer sides of the two bottom frames are respectively hinged on the two frames, the bottom frame parts in the opened state are propped against the lower cross rod, and the side crossing mechanism is characterized in that the outer lower ends and the outer side crossing mechanisms are hinged on the bottom pieces of the two bottom frames or the upper rods in the opened state, and the bottom frame parts can pass through the upper shaft line or the upper end of the upper rods to form a positive rotation axis. The upper rod top end is fixedly provided with a fixed seat, the fixed seat is provided with a connecting hole penetrating along the second direction, the outer upper end of the two-side crossing mechanism is connected with an upper cross rod, and the upper cross rod is connected in the connecting hole and positioned right above the telescopic rod, so that the outer upper end of the side crossing mechanism and the upper rod form rotatable connec