CN210793300U

CN210793300U - Hand cart

Info

Publication number: CN210793300U
Application number: CN201921481841.3U
Authority: CN
Inventors: 胡仁东
Original assignee: Yongkang East Wei Industry And Trade Co ltd
Current assignee: Yongkang East Wei Industry And Trade Co ltd
Priority date: 2019-09-07
Filing date: 2019-09-07
Publication date: 2020-06-19
Anticipated expiration: 2029-09-07

Abstract

The utility model discloses a trolley, which comprises a front wheel, a rear wheel, a bottom frame, a seat and an inclined strut, wherein the bottom frame comprises a front wheel mounting part at the head part, a rear wheel mounting part at the tail part and a horizontal connecting rod for connecting the front wheel mounting part and the rear wheel mounting part, the front wheel mounting part is provided with an inclined strut folding mechanism, the inclined strut folding mechanism is connected with one end of the inclined strut, the inclined strut folding mechanism can enable the inclined strut to rotate up and down relative to the front wheel mounting part, the inclined strut is provided with the seat, and an included angle between the planes of the inclined strut and the bottom frame is 20-70 degrees, preferably 30-60 degrees; the handcart with the arrangement can be provided with a plurality of folding mechanisms on the existing market at the joint of the inclined strut and the underframe, and the handcart with the arrangement is also convenient to fold.

Description

Hand cart

Technical Field

The utility model relates to a handcart belongs to the bassinet field.

Background

The handcart is the article commonly used of children's trip, in order to reduce the volume at transportation and storage in-process, and foldable is all made to general seat, and the design of current handcart is inconvenient sets up folding mechanism on the handcart.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to the not enough of prior art, the utility model provides a conveniently set up folding mechanism's handcart.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a trolley comprises front wheels, rear wheels, an underframe, a seat and an inclined strut, wherein the underframe comprises a front wheel mounting part at the head part, a rear wheel mounting part at the tail part and a horizontal connecting rod for connecting the front wheel mounting part and the rear wheel mounting part, the front wheel mounting part is provided with an inclined strut folding mechanism, the inclined strut folding mechanism is connected with one end of the inclined strut, the inclined strut folding mechanism can enable the inclined strut to rotate up and down relative to the front wheel mounting part, the inclined strut is provided with the seat, and an included angle between a plane where the inclined strut and the underframe are located is 20-70 degrees, preferably 30-60 degrees; the handcart with the arrangement can be provided with a plurality of folding mechanisms on the existing market at the joint of the inclined strut and the underframe, and the handcart with the arrangement is also convenient to fold.

The utility model discloses further set up as, the horizontal connecting rod is provided with two, two the horizontal connecting rod tail end is connected with the rear wheel installation department, the rear wheel installation department includes crosspiece that is rectangular shape, the two-way connector of being connected with crosspiece both ends and fixes the connecting axle on the two-way connector, the two-way connector includes the connecting rod connector that is located the top that is connected and the crosspiece connector that is located the below, the connecting rod connector is pegged graft with the tail end of horizontal connecting rod and is cooperated, one end of crosspiece connector is connected with the crosspiece, the other end of crosspiece connector is installed the connecting axle, after folding, the bracing leans on the; after the inclined strut is arranged around the bottom frame, the inclined strut is positioned between the two connecting rods, so that the size after folding is further reduced.

The utility model is further arranged in that the inclined strut folding mechanism comprises a rotating part connected with the lower end of the inclined strut, a fixed part connected with the front wheel mounting part and a stop part for limiting the folding of the rotating part, and the rotating part is rotationally connected with the fixed part through a rotating shaft; the rotating part is provided with a clamping protrusion, the blocking part abuts against the clamping protrusion to block the rotating part from rotating, and a channel for the blocking part to move up and down is arranged in the fixing part; a bottom plate fixed on the fixing part is arranged below the blocking part, a pull rod is fixed at the lower part of the blocking part and penetrates through the bottom plate, and a reset elastic part is arranged between the bottom surface of the blocking part and the bottom plate; the rotary part is in a round cake shape, a notch is arranged on the rotary part, the notch extends downwards to form a clamping protrusion, and the top surface of the notch and the front side wall of the clamping protrusion form a front clamping groove for accommodating the blocking part; the top surface of the notch and the rear side surface of the clamping protrusion form a rear clamping groove for accommodating the blocking part; the blocking part comprises a lower blocking block positioned at the lower part and an upper blocking block positioned at the upper part, the number of the upper blocking blocks is two, the two upper blocking blocks are arranged in the left-right direction, and a blocking plate which can be clamped between the two upper blocking blocks is arranged in the rear clamping groove; the folding mechanism is simple in design and convenient to use.

The utility model discloses further set up as, the rear wheel passes through the bolt fastening on the connecting axle, be provided with brake mechanism between rear wheel and the connecting axle, brake mechanism includes first locking part, the slip cover that sets up on wheel hub and establishes the second sticking department on the wheel connecting axle and promotes the propulsion portion that the second sticking department slided to first locking part on the connecting axle, be equipped with the locking arch or the locking recess that restrict the wheel rotation on the first locking part, be equipped with on the second sticking department with locking arch or locking recess matched with locking recess or locking arch; the pushing part comprises a rotating part sleeved on the connecting shaft, a blocking part which is abutted by the rotating part and fixedly connected with the connecting shaft, and a rotating pushing structure arranged between the rotating part and the blocking part, and when the rotating part rotates, the rotating pushing structure pushes the rotating part to move towards the second locking part; the rotary pushing structure comprises a convex block or a sliding surface arranged on the side wall of the rotary part and a sliding surface or a convex block arranged at a corresponding position on the side wall of the blocking part, the convex block slides on the sliding surface, the sliding surface is arranged along the rotating direction of the rotary body, and the sliding surface is intersected with the vertical surface of the axis of the connecting shaft; the sliding surface is an inclined surface or a smooth curved surface, the inclined surface is inclined relative to the longitudinal section of the connecting shaft, and the rotating body is provided with a pedal for treading by feet; the first locking part is in a circular column shape, and the locking protrusion or the locking groove is arranged on the end face of the circular column-shaped first locking part; the second locking part comprises a large concentric circular column and a small concentric circular column which are connected, the inner diameter of the large circular column is larger than that of the small circular column, the large circular column is sleeved on the first locking part, the small circular column is sleeved on the connecting shaft, and a locking groove or a locking protrusion corresponding to the locking protrusion or the locking groove on the first locking part is arranged on the inner wall of the joint of the large circular column and the small circular column; the elastic part is positioned between the second locking part and the connecting shaft, the elastic part is arranged on the connecting shaft, an inward protrusion is arranged at one end, close to the pushing part, of the second locking part, a strip-shaped groove matched with the inward protrusion is arranged on the connecting shaft, the inward protrusion abuts against one end of the elastic part, and an elastic part stop blocking the other end of the elastic part is arranged on the connecting shaft; the brake mechanism does not need to be braked by friction wheels, and is convenient to use.

The utility model discloses further set up as, seat folding mechanism is installed to the seat lower part, seat folding mechanism includes outer connecting portion, interior connecting portion and is located the spacer pin in the interior connecting portion, outer connecting portion is including being located the first outer connecting portion and the second outer connecting portion of interior connecting portion both sides, outer connecting portion and interior connecting portion are connected through the pivot, be equipped with the interior spacing chamber that holds the spacer pin in the interior connecting portion, the spacer pin can slide from side to side in the interior spacing chamber; when the device is used, one end of the limiting pin extends out of the inner switching part, an outer limiting cavity for accommodating the extending end of the limiting pin is arranged on the second outer switching part, a propelling mechanism for pushing the limiting pin to retract into the inner limiting cavity is arranged on the second outer switching part, the propelling mechanism is abutted to or spaced from the limiting pin, and a reset elastic part for resetting the limiting pin is arranged in the inner limiting cavity; the seat is connected to the inner adapter part or the outer adapter part through the seat mounting part, and the outer adapter part or the inner adapter part is arranged on a supporting seat for supporting the seat; the seat is convenient to fold and store due to the arrangement of the folding mechanism.

The utility model discloses further set up as, be provided with seat rotary mechanism between the seat with the bracing, the seat is rotatable to be installed on the bracing, seat rotary mechanism includes the bracing piece, can wind bracing piece pivoted supporting seat and rotatory stop gear, rotatory stop gear is including setting up at first spacing portion of supporting seat lower part, along the second spacing portion of bracing piece up-and-down motion, the elasticity that resets to second spacing portion resets and prevent that the second spacing portion winds the bracing piece pivoted prevents the mechanism that changes, the second spacing portion blocks with the first spacing portion counterbalance and blocks the first spacing portion is rotatory, be fixed with the backstop seat on the bracing piece, elasticity resets one end and leans on the backstop seat, the other end leans on the second spacing portion; the first limiting part is a non-circular limiting block arranged on the bottom surface of the supporting seat, the limiting block is cuboid, the limiting groove is formed in the inner wall of the second limiting part, and the cross section of the limiting groove is in a right-angled triangle shape matched with the angle of the cuboid; the anti-rotation mechanism comprises an anti-rotation groove or an anti-rotation bulge arranged on the inner wall of the second limiting part and anti-rotation bulges or anti-rotation grooves arranged on the supporting rod, the anti-rotation bulges can slide up and down in the anti-rotation grooves, the anti-rotation grooves are provided with a plurality of anti-rotation bulges, the anti-rotation bulges are matched with the number and positions of the anti-rotation grooves, and the inner side walls of the anti-rotation grooves are abutted against the anti-rotation bulges to realize anti-rotation; the seat folding mechanism is matched to more conveniently store the seat to a proper position.

The utility model discloses further set up to, be connected with the footboard on the bracing, the footboard is located the rear portion of seat.

The utility model is further arranged in that the lower part of the support rod is connected with an inclined strut connecting part, and the inclined strut connecting part is sleeved on the inclined strut; this arrangement facilitates adjustment of the position of the seat.

The utility model discloses further set up to, keep away from the one side of wheel on the stop part and extend the formation installation department to the direction of keeping away from the wheel, the installation department is connected with the other end of crosspiece connector, the installation department is the cavity setting, is equipped with the spring buckle on the installation department, is equipped with the buckle hole that supplies the spring buckle to stretch out on the crosspiece connector, and the installation department is equipped with the nut groove that holds the nut with the stop part junction.

The utility model is further arranged that the orthographic projection of the seat is projected at the central position of the bottom frame; the arrangement enables the center of gravity to be located at the center of the bottom frame, and the trolley is prevented from being toppled.

Drawings

Fig. 1 is a schematic structural view of the cart of the present invention;

FIG. 2 is a first exploded view of the diagonal bracing folding mechanism of FIG. 1;

FIG. 3 is a second exploded view of the diagonal bracing folding mechanism of FIG. 1;

FIG. 4 is a schematic view of the blocking portion of FIG. 2 at the front card slot;

FIG. 5 is a schematic view of the rotary portion of the folding mechanism of FIG. 2;

FIG. 6 is a schematic diagram of the stop portion of the diagonal fold mechanism of FIG. 2;

FIG. 7 is a schematic structural view of the base plate of FIG. 2;

FIG. 8 is a cross-sectional view of the brake mechanism of FIG. 1;

FIG. 9 is an exploded view of the brake mechanism of FIG. 1;

FIG. 10 is a schematic view of the structure of the stop portion, the connecting shaft, and the crosspiece connecting portion of FIG. 9;

FIG. 11 is a disassembled schematic view of the seat swivel mechanism of FIG. 1;

FIG. 12 is a schematic view of the seat swivel mechanism of FIG. 1;

FIG. 13 is a bottom view of the support base of FIG. 11;

FIG. 14 is a schematic structural view of the second position-limiting portion of FIG. 11;

FIG. 15 is a schematic structural view of the second position-limiting portion shown in FIG. 11;

FIG. 16 is an exploded view of the seat folding mechanism, the seat mounting portion and the support base of the present invention;

FIG. 17 is a schematic structural view of the inner switching portion and the seat mounting portion of FIG. 16;

FIG. 18 is an exploded view of the outer adapter and the support base of FIG. 16;

FIG. 19 is a schematic view of the structure of FIG. 16 after the external connection unit, the supporting base, the rotating shaft and the sliding rod are assembled;

FIG. 20 is a schematic view of the construction of the putter of FIG. 16;

FIG. 21 is a first exploded view of the second outer adapter cap of FIG. 16;

fig. 22 is a second exploded view of the second outer adapter cap of fig. 16.

In the figure: 1. a chassis; 101. a front wheel mounting portion; 102. a horizontal connecting rod; 103. a rear wheel mounting portion; 2. a front wheel; 3. a rear wheel; 4. bracing; 5. a seat; 6. a grip portion; 7. a brake mechanism; 72. a second locking portion; 73. a rotating part; 731. treading a pedal; 732. A bump; 74. a blocking portion; 741. a sliding surface; 75. a spring; 76. a spring stop; 77. a connecting shaft; 78. a rung mounting portion; 79. a spring buckle; 711. A first locking section; 7111. locking the groove; 712. a hub; 713. a bearing; 714. a bolt; 101. A rear wheel; 102. a front wheel; 103. a crosspiece; 104. a vehicle frame. 8. A seat folding mechanism; 81. an inner transfer part; 811. a first inner transition portion; 812. a second inner transition portion; 813. a third inner transition portion; 814. an inner limiting cavity; 815. a seat mounting portion; 816. a shaft hole; 817. a slide bar hole; 82. an outer transition portion; 821. a first outer swivel part; 822. a second outer adapter portion; 8211. a first outer hinge part body; 8212. a first outer adapter cover; 8221. a second outer adapter outer body; 8222. a second outer adapter cap; 82221. a blocking groove; 82222. a large cylindrical hole; 82223. a guide groove; 823. a chute; 824. a supporting seat; 825. an outer limiting cavity; 83. A rotating shaft; 84. a spacing pin; 86. A propulsion mechanism; 861. a push rod; 8611. a small cylindrical section; 8612. a blocking block; 8613. a large cylindrical section; 87. a button cap; 88. a slide bar; 89. mounting blocks; 891. a small cylindrical hole; 9. a seat rotation mechanism; 91. a supporting seat; 92. a support bar; 93. a second limiting part; 94. a spring; 95. a stop seat; 96. a sprag connection; 911. A first limiting part; 912. rotating the rod; 913. a first guide retainer ring; 921. a plug rod; 922. a bearing rod; 9221. an anti-rotation protrusion; 931. a limiting groove; 932. an anti-rotation groove; 933. a first limiting guide groove; 11. a diagonal bracing folding mechanism; 111. a rotating part; 112. a fixed part; 113. a blocking portion; 114. a spring; 115. A base plate; 116. a handle; 117. a front wheel; 118. a rear wheel; 119. a chassis; 1111. clamping convex; 1112. a front card slot; 1113. a rear clamping groove; 1114. a blocking plate; 1115. a sprag connection; 1131. an upper stopper; 1132. a lower stop block; 1133. a pull rod; 1151. a groove; 1152. a spring slot; 12. a connecting head.

Detailed Description

An embodiment of a trolley according to the invention will be further explained with reference to fig. 1 to 22.

A trolley comprises front wheels 2, rear wheels 3, an underframe 1, seats 5 and an inclined strut 4, wherein the underframe comprises a front wheel mounting part 101 at the head part, a rear wheel mounting part 103 at the tail part and a horizontal connecting rod 102 for connecting the front wheel mounting part 101 with the rear wheel mounting part 103, the end part of the front wheel mounting part 101 is provided with an inclined strut folding mechanism 11, the inclined strut folding mechanism 11 is connected with one end of the inclined strut, the inclined strut folding mechanism 11 can enable the inclined strut 4 to rotate up and down relative to the front wheel mounting part 101, the seats 5 are arranged on the inclined strut 4, and an included angle between the plane where the inclined strut and the underframe 1 are located is 20-70 degrees, preferably 30-60 degrees; the two horizontal connecting rods 102 are arranged, the tail ends of the two horizontal connecting rods 102 are connected with a rear wheel mounting part 103, the rear wheel mounting part 103 comprises a long-strip-shaped crosspiece, two-way connectors 12 connected with the two ends of the crosspiece and a connecting shaft 78 fixed on the two-way connectors, the two-way connectors comprise connecting rod connectors located above and crosspiece connectors located below, the connecting rod connectors are matched with the tail ends of the horizontal connecting rods in an inserted mode, one ends of the crosspiece connectors are connected with the crosspiece, the other ends of the crosspiece connectors are provided with the connecting shaft, and particularly, the tail ends of the horizontal connecting rods 102 are inserted in the connectors and; after folding, the bracing supports and leans on two on the crosspiece between the crosspiece connector.

The supporting rod is connected with a pedal, and the pedal is positioned at the rear part of the seat; the orthographic projection of the seat is projected at the central position of the underframe 1.

The following are embodiments of the diagonal bracing folding mechanism:

as shown in fig. 2 to 7, the diagonal brace folding mechanism 11 includes a rotating portion 111 disposed at a lower end of the diagonal brace 4, a fixing portion 112 supporting the rotating portion 111, and a blocking portion 113 limiting folding of the rotating portion 111, wherein the rotating portion 111 is rotatably connected to the fixing portion 112 through a rotating shaft; the rotating part 111 is provided with a clamping protrusion 1111, and the blocking part 113 is arranged in the fixing part 112; the blocking portion 113 moves up and down to block the rotation of the snap 1111 and release the blocking of the snap 1111.

The rotary part 111 is in a round cake shape, the upper part of the rotary part 111 is provided with a diagonal brace connecting part 1115 connected with a diagonal brace 4, and the diagonal brace connecting part 1115 is integrally formed with the rotary part; a notch is formed in the lower portion of the rotating portion 111, the notch extends downwards to form a clamping protrusion 1111, and a front clamping groove 1112 for accommodating the blocking portion 113 is formed by the top surface of the notch and the front side wall of the clamping protrusion 1111; the top surface of the notch and the back side surface of the clamping projection 1111 form a back clamping groove 1113 for accommodating the blocking part 113; a blocking plate 1114 capable of being clamped into the blocking part 113 is arranged in the rear clamping groove 1113.

The rotating part is positioned between the two side plates, and the rotating shaft penetrates through the center of the rotating part; a passage for the stopper 113 to move up and down is longitudinally provided in the lower portion of the fixing portion, and longitudinally penetrates the fixing portion 112.

In another embodiment, the fixed part further comprises a front connecting plate connected with the front end of the side plate and a rear connecting plate connected with the rear end of the side plate, the rotating part is located between the two side plates, and the bottom plate is connected to the bottom of the fixed part.

The blocking portion 113 includes a lower blocking piece 1132 and an upper blocking piece 1131 on the upper portion of the lower portion, the upper blocking piece 1131 is provided with two, the two upper blocking pieces 1131 are arranged in the left-right direction, and a blocking plate 1114 clamped between the two upper blocking pieces 1131 is arranged in the rear clamping groove 1113.

A bottom plate 115 fixed on the fixing part 112 is arranged below the blocking part 113, and the bottom plate 115 is installed on the fixing part 112 around the lower end surface of the channel through screws; two pull rods 1133 are fixed at the lower part of the blocking part 113, the pull rods 1133 and the blocking part 113 are integrally formed, and the pull rods 1133 penetrate through the bottom plate 115. A groove 1151 for accommodating the blocking portion 113 is formed in the bottom plate 115, a return elastic member is arranged between the blocking portion 113 and the bottom plate 115, the return elastic member is a spring 114, the spring 114 is arranged between the two pull rods 1133 or sleeved on the two pull rods 1133, and a spring groove 1152 for accommodating the end portion of the spring 114 is formed in the bottom surface of the groove 1151; the end parts of the pull rods 1133 are fixed with handles 116, the handles 116 fixed on the two pull rods 1133 are integrally formed, and the handles 116 are fixed on the pull rods 1133 through screws; when the folding type folding device is used, the pull rod 1133 is pulled downwards, the pull rod 1133 drives the blocking portion 113 to move downwards, and the rotating portion 111 can be folded or unfolded around the fixing portion 112 at the moment; when the rotating portion 111 is folded or unfolded, the stopping portion 113 returns to the rear slot 1113 or the front slot 1112 under the action of the spring 114, and the stopping portion 113 abuts against the locking protrusion 1111 to block the rotating portion 111 from further moving.

In this embodiment, the forward direction of the vehicle head is taken as the front.

The following are examples of the brake mechanism 7:

as shown in fig. 8 to 10, the brake mechanism 7 includes a first locking portion 711 provided on the rear wheel hub 712, a second locking portion 72 slidably fitted over the rear wheel connecting shaft 77, an urging portion urging the second locking portion 72 to slide on the connecting shaft 77, and an elastic member for returning the second locking portion 72.

The first locking part 711 is in a cylindrical ring shape coaxial with the rear wheel, the first locking part 711 and the rear wheel hub 712 are integrally formed, a locking groove 7111 for limiting the rotation of the rear wheel is arranged on the end face of the cylindrical first locking part 711, and the locking grooves 7111 are uniformly distributed on the end face of the annular first locking part 711.

The second locking portion 72 includes two concentric circular columns, one large and one small, the inner diameter of the large circular column is larger than that of the small circular column, the large circular column is sleeved on the first locking portion 711, the small circular column is sleeved on the connecting shaft 77, a step is formed at the joint of the large circular column and the small circular column, and a locking protrusion matched with the locking groove 7111 is arranged on the step.

The above-described locking protrusion may also be provided on the first locking part 711 and the locking recess 7111 is provided on the second locking part 72.

The elastic piece is a spring 75, the spring 75 is sleeved on the connecting shaft 77, the spring 75 is positioned between the small circular ring column and the connecting shaft 77, an inward protrusion is arranged at the end part of the small circular ring column, the inward protrusion abuts against one end of the spring 75, a groove matched with the inward protrusion is arranged on the connecting shaft 77, the groove is in a long strip shape, and when the second locking part 72 is pushed by the pushing part, the inward protrusion slides in the long strip-shaped groove; the connecting shaft 77 is also provided at one end with a spring stop 76 that blocks the other end of the spring 75.

The spring retainer 76 comprises a thick circular column and a thin circular column, the outer diameter of the thick circular column is larger than that of the thin circular column, the thick circular column is tightly sleeved at the end part of the connecting shaft 77, the inner wall of the thick circular column is provided with an anti-rotation bulge matched with a groove on the connecting shaft 77, the thin circular column is positioned in a circular ring of the first cylindrical locking part 711 of the circular ring, and the end part of the thin circular column is abutted against the inner ring of the bearing 713.

The propelling part comprises a rotating part 73 sleeved on the connecting shaft 77, a blocking part 74 for the rotating part 73 to abut against and a rotary pushing structure, the rotating part 73 can rotate around the connecting shaft 77, and the blocking part 74 is fixed on the connecting shaft 77; the rotational urging structure includes a projection 732 provided on a side wall of the rotating portion 73 and a sliding surface 741 provided on a side wall of the stopper portion 74.

The projection 732 is provided on a side wall of the rotating portion 73 and is integrally formed with the rotating portion 73; a pedal 731 for foot stepping is arranged on the rotating part 73, and the pedal 731 and the rotating part 73 are integrally formed; the lug 732 faces the blocking part 74, a sliding surface 741 is disposed on a side wall of the blocking part 74 corresponding to the lug 732, the side wall of the rotating part 73 and the side wall of the blocking part 74 are both perpendicular to the connecting shaft 77, the lug 732 slides on the sliding surface 741 along with the rotation of the rotating body, the sliding surface 741 has at least one section of inclined surface, the inclined surface is disposed obliquely relative to a longitudinal section of the connecting shaft 77 such that one end of the inclined surface is closer to the rear wheel and the other end is far away from the rear wheel, and the longitudinal section is a surface perpendicular to the axis of the rotating; the contact surface of the projection 732 and the sliding surface 741 is a curved surface having a section of inclined surface, the middle of the sliding surface 741 is an inclined surface, and the two ends are transition surfaces matched with the curved surface of the projection 732, and the transition surfaces are curved surfaces; the side wall of the blocking portion 74 is recessed to form a sliding groove, and the sliding surface 741 forms a bottom surface of the sliding groove.

The pedal 731 is stepped on by a foot to enable the rotating portion 73 to rotate around the connecting shaft 77, the projection 732 arranged on the side wall of the rotating portion 73 rotates around the connecting shaft 77 along with the rotation of the rotating portion 73, so that the projection 732 slides on the sliding surface 741, and as the sliding surface 741 has a section of inclined surface, when the projection 732 slides on the inclined surface, the inclined surface pushes the projection 732 to translate on the connecting shaft 77, so that the rotating portion 73 translates on the connecting shaft 77, the second locking portion 72 is pushed to be close to the first locking portion 711, and at the moment, the projection on the second locking portion 72 sinks into the groove of the first locking portion 711, and the rotation of the.

In another embodiment, the sliding surface 741 is a smooth curved surface, which is disposed in a long bar shape, and has one end close to the rear wheel and the other end far from the rear wheel; seen from the side of the curved surface, the curved surface resembles the middle section of a sine or cosine curve.

The sliding surface 741 gradually moves toward or away from the first locking portion 711 in the rotational direction of the projection 732.

Above-mentioned blocking portion 74 and connecting axle 77 integrated into one piece, the cross-section of above-mentioned crosspiece is runway shape, and the one side of keeping away from the rear wheel on the blocking portion 74 extends to the direction of keeping away from the rear wheel and forms crosspiece installation department 78, crosspiece installation department 78 can with the crosspiece cooperation installation that sets up between the rear wheel of perambulator, crosspiece installation department 78 is the cavity setting, is equipped with spring buckle 79 on the crosspiece installation department 78, is equipped with the buckle hole that supplies spring buckle 79 to stretch out on the crosspiece, and crosspiece installation department 78 is equipped with the nut groove that holds the nut with blocking portion 74 junction, and bolt 714 passes bearing 713, spring shelves 76, connecting axle 77 and blocking portion 74 and nut threaded.

The brake principle will be explained below by setting the protrusion 732 on the rotating portion 73, when the brake is required, the pedal 731 is pressed, the rotating portion 73 rotates, the protrusion 732 on the rotating portion 73 slides on the sliding surface 741, because the sliding surface 741 is inclined, the protrusion 732 drives the rotating portion 73 to move in a direction close to the rear wheel under the blocking of the sliding surface 741, the rotating portion 73 pushes the second locking portion 72 to slide in a direction close to the first locking portion 711 until the locking protrusion sinks into the locking recess 7111, and the rear wheel stops rotating at this time, i.e. the brake is realized.

The following are examples of seat folding mechanisms:

as shown in fig. 16 to 22, the seat folding mechanism 8 includes an outer connecting portion 82, an inner connecting portion 81 and a limiting pin 84 located inside the inner connecting portion, wherein the outer connecting portion 82 includes a first outer connecting portion 821 and a second outer connecting portion 822 located at two sides of the inner connecting portion 81, the outer connecting portion 82 and the inner connecting portion 81 are connected by a rotating shaft 83, an inner limiting cavity 814 for accommodating the limiting pin 84 is provided inside the inner connecting portion 81, the limiting pin 84 can slide left and right inside the inner limiting cavity 814, and when in use, one end of the limiting pin 84 protrudes from the inner connecting portion 81; the second outer adapter part 822 is provided with an outer limiting cavity 825 for accommodating the extending end of the limiting pin 84, the second outer adapter part 822 is provided with a pushing mechanism 86 for pushing the limiting pin 84 to retract into the inner limiting cavity 814, the pushing mechanism 86 is not connected with the limiting pin 84, and the inner limiting cavity 814 is internally provided with a resetting elastic part for resetting the limiting pin 84, wherein the resetting elastic part is a spring.

The limit pin 84 includes two sections of cylinders with different diameters, the outer diameter of the rear section cylinder is larger than that of the front section cylinder, the end face of the rear section cylinder exposed at the joint of the two sections of cylinders forms a first limit step, and the bottom of the rear section cylinder is connected with a reset elastic piece.

The inner rotary part 81 is cylindrical, a shaft hole 816 for the rotating shaft 83 to penetrate through is arranged at the central axis position of the inner rotary part 81, and an inner limit cavity 814 in the inner rotary part 81 is a long strip-shaped blind hole matched with the limit pin 84 and is parallel to the rotating shaft 83; a sliding rod 88 is arranged on the inner transfer part 81, the sliding rod 88 passes through the inner transfer part 81, a sliding rod hole 817 for the sliding rod 88 to pass through is arranged on the inner transfer part 81, and the sliding rod 88 is parallel to the rotating shaft 83; the inner limiting cavity 814 comprises two sections of holes with different diameters matched with the limiting pin 84, the diameter of the rear section of hole is larger than that of the front section of hole, and a second limiting step is formed on the inner wall of the joint of the two sections of holes; under the effect of the reset spring of the limit pin, after the front end of the limit pin 84 stretches out of the inner transfer part 81, the first limit step is abutted against the second limit step, and the limit pin 84 is prevented from being separated from the inner transfer part 81 under the effect of the spring.

The inner connection portion 81 includes a first inner connection portion 811 located in the middle, and a second inner connection portion 812 and a third inner connection portion 813 fixed on both sides of the first inner connection portion 811, the second inner connection portion 812 is close to the tail end of the limit pin 84, the third inner connection portion 813 is close to the extending end of the limit pin 84, the inner limit cavity 814 penetrates through the first inner connection portion 811 and the third inner connection portion 813, and the second inner connection portion 812 shields the bottom of the inner limit cavity 814 to make the inner limit cavity 814 become a blind hole.

A return spring of the limiting pin is arranged at the tail part of the limiting pin 84, and a spring groove for accommodating one end of the spring is arranged at the tail part of the limiting pin 84; one end of the spring abuts against the bottom wall of the inner limiting cavity 814, and the other end of the spring abuts against the inside of the spring groove; the length of the inner limiting cavity 814 and the limiting pin 84 can be set so that when the return spring of the limiting pin is compressed to the minimum position or the spring is completely retracted into the spring groove, the protruding end of the limiting pin 84 is just flush with the side wall of the inner junction 81, and the pushing mechanism 86 is prevented from being located in the inner junction 81 when the limiting pin 84 is retracted into the inner junction 81, and the inner junction 81 is prevented from being influenced to rotate relative to the outer junction 82.

The first outer adaptor 821 and the second outer adaptor 822 are both cylindrical, and the first outer adaptor 821 includes a first outer adaptor body 8211 at an inner side and a first outer adaptor cover 8212 fixed on an outer sidewall of the first outer adaptor body 8211; the second external adaptor 822 includes a second external adaptor body 8221 at an inner side and a second external adaptor cover 8222 fixed at an outer side of the second external adaptor body 8221, the rotation shaft 83 is adapted to the first external adaptor body 8211 and the second external adaptor body 8221, a sliding groove 823 for the sliding of the sliding rod 88 is further disposed on the first external adaptor body 8211 and the second external adaptor body 8221, the sliding groove 823 is a circular arc sliding groove centering on the rotation shaft 83, the external limiting cavity is disposed on the second external adaptor body 8221, and the pushing mechanism 86 is disposed on the second external adaptor cover 8222.

The pushing mechanism 86 comprises a pushing rod 861 and a pushing return spring for returning the pushing rod 861, wherein one end of the pushing rod 861 extends out of the outer adaptor 82, specifically, one end of the pushing rod 861 extends out of the second outer adaptor cover 8222, and the other end pushes the limit pin 84 to retract into the inner adaptor 81; the push rod 861 comprises a large cylindrical section 8613, a small cylindrical section 8611 and a blocking block 8612 positioned between the large cylindrical section 8613 and the small cylindrical section 8611, wherein the blocking block 8612 is a square body, the square body protrudes out of the large cylindrical section 8613 and the small cylindrical section 8611, the small cylindrical section 8611 is positioned at the inner side, the large cylindrical section 8613 is positioned at the outer side, and the side wall of the blocking block 8612 facing the small cylindrical section 8611 forms a first blocking step;

a blocking groove 82221 in sliding fit with the pushing rod 861 is formed in the outer side face of the second outer adapter portion 822, a large cylindrical hole 82222 allowing a large cylindrical section 8613 to extend out is formed in the outer end face of the blocking groove 82221, a pushing return spring is sleeved on the small cylindrical section 8611, an installation block 89 is installed at the other end of the blocking groove, a small cylindrical hole 891 allowing a small cylindrical section to extend out is formed in the installation block, and the pushing rod 861 is limited to slide in the blocking groove 82221; when the push rod 861 is installed, the installation block is removed, the push rod 861 is placed in, the small cylindrical section 8611 is sleeved with the spring, the installation block is sleeved on the small cylindrical section 8611, and the installation block 89 is fixed on the second external adapter cover 8222 through a screw.

A button cap 87 is fixed on the extending end of the large cylindrical section 8613, a concentric guide groove 82223 guiding the button cap 87 is sleeved on the periphery of the blocking groove 82221, the guide groove 82223 is fixed on the outer side surface of the second outer adapter portion 822, and the button cap 87 can slide in the guide groove 82223.

The inner switching portion 81 extends rearward to form a seat mounting portion 815 on which the seat is mounted; the outer swivel 82 extends rearwardly or downwardly to form a support 824, and the support 824 may be mounted on a cart, such as a trolley, to which the seat is to be mounted.

The utility model discloses the folding process of well seat as follows: when the seat needs to be folded, the button cap 87 is pressed, the button cap 87 pushes the push rod 861 to slide inwards, the push rod 861 pushes the limit pin 84 until the limit pin 84 is completely retracted into the inner connecting portion 81, the blocking of the limit pin 84 is lost between the outer connecting portion 82 and the inner connecting portion 81, the inner connecting portion 81 can rotate relative to the outer connecting portion 82, the slide rod 88 slides in the slide groove 823 in the rotating process, and when the seat is folded to a needed position, the slide rod 88 just slides to the end of the slide groove 823, so that the further rotation limiting is realized in an auxiliary manner; when the seat does not need to be folded, the seat is rotated to the opposite direction, when the seat is rotated to a needed position, under the action of the reset spring of the limiting pin, the extending end of the limiting pin 84 extends into the outer limiting cavity, at the moment, the outer rotating part 82 and the inner rotating part 81 cannot rotate any further, limiting is achieved, at the moment, the sliding rod 88 just slides to the other end of the sliding groove 823, the seat is prevented from further rotating, and auxiliary limiting is achieved.

The following are examples of seat swivel mechanisms:

as shown in fig. 11 to 15, the seat rotating mechanism 9 includes a support rod 92, a support seat 91 rotating around the support rod 92, and a rotation limiting mechanism, wherein a downward rotating rod 912 is fixed at the lower part of the support seat 91, the support rod is cylindrical, a bearing is fixed on the inner wall of the upper end of the support rod, and the rotating rod 912 is fixed on the inner ring of the bearing.

The supporting rod 92 comprises an inserting rod 921 at the upper part and a bearing rod 922 at the lower part, the inserting rod 921 extends into the bearing rod 922 and is fixedly connected with the bearing rod 922 through a bolt, the inserting rod 921 is cylindrical, and the lower end of the inserting rod 921 is obliquely arranged so as to be convenient for inserting; the receiving rod 922 is cylindrical and fits the insertion rod 921.

Referring to fig. 1 and 3 of the specification, the rotation limiting mechanism includes a first limiting portion 911 disposed at a lower portion of the rotatable supporting seat 91, a second limiting portion 93 capable of moving up and down along the supporting rod, and an anti-rotation mechanism limiting the rotation of the second limiting portion 93 around the supporting rod, and the second limiting portion 93 and the first limiting portion 911 abut against each other to block the rotation of the first limiting portion 911; the elastic reset device further comprises an elastic reset piece, wherein a blocking seat 95 which blocks one end of the elastic reset piece is fixed on the supporting rod 92, one end of the elastic reset piece is abutted against the blocking seat 95, and the other end of the elastic reset piece is abutted against the second limiting part 93.

The first position-limiting portion 911 is disposed on the bottom surface of the supporting seat 91 and is integrally formed with the supporting seat 91, and the first position-limiting portion 911 is in a non-circular shape, preferably a rectangular parallelepiped shape, having at least one corner or protruding strip; the rotating rod 912 is located at the center of the first stopper 911; the bottom surface of the supporting seat 91 extends downwards to form a first guiding retainer 913 which assists in guiding the second limiting portion 93 to move up and down.

Referring to the specifications 4 to 6, the second limiting portion 93 is sleeved on the supporting rod 92, and a limiting groove 931 is formed on an inner wall of the second limiting portion 93; when the first limiting portion 911 is rectangular, the number of the limiting grooves 931 is four, the connecting line of the four limiting grooves 931 is rectangular to match with the rectangular first limiting portion 911, the cross section of each limiting groove 931 is a right triangle to match with the corner of the rectangular, and the limiting grooves 931 do not penetrate through the second limiting portions 93 in the longitudinal direction; the second limiting part 93 is annular, a first limiting guide groove 933 with an upward opening and used for accommodating the first guide retainer ring 913 is formed in the annular second limiting part 93, and the first limiting guide groove 933 is annular and coaxial with the annular second limiting part 93; the second limiting portion 93 is further provided with a circular second limiting guide groove with a downward opening, and the second limiting guide groove is not communicated with the first limiting guide groove 933.

The anti-rotation mechanism comprises an anti-rotation groove 932 or an anti-rotation bulge arranged on the inner wall of the second limiting part 93, and an anti-rotation bulge 9221 or an anti-rotation groove arranged on the support rod 92; preferably, the anti-rotation protrusions 9221 are arranged on the support rod 92, and the anti-rotation grooves 932 are arranged on the inner wall of the second limiting portion 93; one or more anti-rotation grooves 932 can be arranged according to actual needs, and the number and the positions of the anti-rotation protrusions 9221 correspond to those of the anti-rotation grooves 932; preferably, four anti-rotation grooves 932 are provided, the four anti-rotation grooves 932 are staggered with the four limiting grooves 931, and the connecting line of the four anti-rotation grooves 932 on the horizontal plane is rectangular to be matched with the first limiting portion 911, and at this time, the anti-rotation grooves 932 can also limit the rotation of the first limiting portion 911; the rotation preventing projections 9221 can slide up and down in the rotation preventing recesses 932.

Preferably prevent that groove 932 sets up at the spacing portion 93 inner wall of second, prevents that the commentaries on classics is protruding to be set up along the circumferential direction on the surface of adapting rod 922, prevents that the commentaries on classics is protruding if setting up a plurality ofly, a plurality of protruding evenly distributed that prevent changeing are on adapting rod 922, prevents that groove 932 runs through the spacing portion 93 of second and sets up in the direction of height, prevents that the upper portion of changeing groove 932 can offset with first spacing portion 911 and block first spacing portion 911 rotatory this moment.

The elastic reset piece is a spring 94, the spring 94 is sleeved on the support rod, and the upper end of the spring 94 abuts against the second limiting guide groove; a resisting seat 95 is fixed at the lower part of the supporting rod 92, referring to fig. 1, 7 and 8 of the specification, the resisting seat 95 is sleeved on the supporting rod 92, the resisting seat 95 is in a circular groove shape with an upward opening, the bottom of the resisting seat 95 blocks the lower end of the spring 94, the lower end of the resisting seat 95 is provided with an inward bulge, and the upper end of the side wall of the resisting seat 95 extends into the second limiting guide groove; during installation, the resisting seat 95 is sleeved on the adapting rod 922 from the upper part of the adapting rod 922, at this time, the protrusion on the resisting seat 95 passes through the gap between two adjacent anti-rotation protrusions on the adapting rod 922, and the protrusion on the resisting seat 95 is arranged to prevent the spring 94 from sliding out from the lower end of the resisting seat 95.

The lower end of the support rod 92 is provided with an inclined strut connecting part 96 fixedly connected with the inclined strut 4, the inclined strut connecting part 96 and the bearing rod 922 are integrally formed, and the inclined strut connecting part 96 is sleeve-shaped and is sleeved on the inclined strut 4; the seat 5 is mounted on a support base 91.

When the seat is used, the seat 5 or a part needing to rotate is arranged on the supporting seat 91, the second limiting part 93 is pulled downwards, the second limiting part 93 is separated from the first limiting part 911, the supporting seat 91 can rotate around the supporting rod to drive the seat 5 arranged on the supporting seat 91 to rotate, when the seat 5 rotates to a required position, the second limiting part 93 moves upwards to abut against the first limiting part 911 under the action of the elastic reset piece, and the second limiting part 93 cannot rotate, so that the second limiting part 93 abuts against the first limiting part 911, the first limiting part 911 is prevented from rotating, and the seat 5 is prevented from rotating.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a handcart, its characterized in that includes front wheel, rear wheel, chassis, seat and bracing, the chassis includes the front wheel installation department of head, the rear wheel installation department of afterbody and connects the horizontal connecting rod of front wheel installation department and rear wheel installation department, be equipped with bracing folding mechanism on the front wheel installation department, bracing folding mechanism with the one end of bracing is connected, bracing folding mechanism enables the bracing rotates from top to bottom for the front wheel installation department, be equipped with the seat on the bracing, the contained angle between bracing and the chassis place plane is 20-70 degrees.

2. A trolley according to claim 1, characterized in that the horizontal connecting rods are provided with two horizontal connecting rods, two the tail ends of the horizontal connecting rods are connected with rear wheel mounting parts, each rear wheel mounting part comprises a long-strip-shaped crosspiece, two-way connectors connected with two ends of the crosspiece and connecting shafts fixed on the two-way connectors, each two-way connector comprises a connecting rod connector located above and a crosspiece connector located below, the connecting rod connectors are matched with the tail ends of the horizontal connecting rods in a splicing manner, one ends of the crosspiece connectors are connected with the crosspiece, the connecting shafts are mounted at the other ends of the crosspiece connectors, and after folding, the inclined struts are abutted against the crosspiece between the.

3. The cart of claim 1, wherein the diagonal-strut folding mechanism includes a rotating portion connected to a lower end of the diagonal strut, a fixed portion connected to the front-wheel mounting portion, and a blocking portion for limiting folding of the rotating portion, the rotating portion being rotatably connected to the fixed portion via a rotating shaft; the rotating part is provided with a clamping protrusion, the blocking part abuts against the clamping protrusion to block the rotating part from rotating, and a channel for the blocking part to move up and down is arranged in the fixing part; a bottom plate fixed on the fixing part is arranged below the blocking part, a pull rod is fixed at the lower part of the blocking part and penetrates through the bottom plate, and a reset elastic part is arranged between the bottom surface of the blocking part and the bottom plate; the rotary part is in a round cake shape, a notch is arranged on the rotary part, the notch extends downwards to form a clamping protrusion, and the top surface of the notch and the front side wall of the clamping protrusion form a front clamping groove for accommodating the blocking part; the top surface of the notch and the rear side surface of the clamping protrusion form a rear clamping groove for accommodating the blocking part; the blocking part comprises a lower blocking block positioned at the lower part and an upper blocking block positioned at the upper part, the upper blocking block is provided with two blocks, the two blocks are arranged in the left-right direction, and a blocking plate which can be clamped into the two blocks is arranged in the rear clamping groove.

4. The trolley as claimed in claim 2, wherein the rear wheel is fixed on the connecting shaft by a bolt, a brake mechanism is provided between the rear wheel and the connecting shaft, the brake mechanism includes a first locking portion provided on a wheel hub, a second locking portion slidably fitted over the wheel connecting shaft, and a pushing portion for pushing the second locking portion to slide on the connecting shaft toward the first locking portion, the first locking portion is provided with a locking protrusion or a locking groove for restricting rotation of the wheel, and the second locking portion is provided with a locking groove or a locking protrusion engaged with the locking protrusion or the locking groove; the pushing part comprises a rotating part sleeved on the connecting shaft, a blocking part which is abutted by the rotating part and fixedly connected with the connecting shaft, and a rotating pushing structure arranged between the rotating part and the blocking part, and when the rotating part rotates, the rotating pushing structure pushes the rotating part to move towards the second locking part; the rotary pushing structure comprises a convex block or a sliding surface arranged on the side wall of the rotary part and a sliding surface or a convex block arranged at a corresponding position on the side wall of the blocking part, the convex block slides on the sliding surface, the sliding surface is arranged along the rotating direction of the rotary body, and the sliding surface is intersected with the vertical surface of the axis of the connecting shaft; the sliding surface is an inclined surface or a smooth curved surface, the inclined surface is inclined relative to the longitudinal section of the connecting shaft, and the rotating body is provided with a pedal for treading by feet; the first locking part is in a circular column shape, and the locking protrusion or the locking groove is arranged on the end face of the circular column-shaped first locking part; the second locking part comprises a large concentric circular column and a small concentric circular column which are connected, the inner diameter of the large circular column is larger than that of the small circular column, the large circular column is sleeved on the first locking part, the small circular column is sleeved on the connecting shaft, and a locking groove or a locking protrusion corresponding to the locking protrusion or the locking groove on the first locking part is arranged on the inner wall of the joint of the large circular column and the small circular column; the elastic part is arranged between the second locking part and the connecting shaft, the elastic part is arranged on the connecting shaft, an inward protrusion is arranged at one end, close to the pushing part, of the second locking part, a long strip-shaped groove matched with the inward protrusion is arranged on the connecting shaft, the inward protrusion abuts against one end of the elastic part, and an elastic part stop blocking the other end of the elastic part is arranged on the connecting shaft.

5. The cart of claim 1, wherein a seat folding mechanism is mounted at a lower portion of the seat, the seat folding mechanism includes an outer rotating portion, an inner rotating portion and a limit pin located inside the inner rotating portion, the outer rotating portion includes a first outer rotating portion and a second outer rotating portion located at two sides of the inner rotating portion, the outer rotating portion and the inner rotating portion are connected by a rotating shaft, an inner limit cavity for accommodating the limit pin is formed inside the inner rotating portion, and the limit pin can slide left and right inside the inner limit cavity; when the device is used, one end of the limiting pin extends out of the inner switching part, an outer limiting cavity for accommodating the extending end of the limiting pin is arranged on the second outer switching part, a propelling mechanism for pushing the limiting pin to retract into the inner limiting cavity is arranged on the second outer switching part, the propelling mechanism is abutted to or spaced from the limiting pin, and a reset elastic part for resetting the limiting pin is arranged in the inner limiting cavity; the seat is connected to the inner adapter part or the outer adapter part through the seat mounting part, and the outer adapter part or the inner adapter part is arranged on a supporting seat for supporting the seat.

6. The trolley of claim 4, wherein a seat rotation mechanism is disposed between the seat and the diagonal brace, the seat is rotatably mounted on the diagonal brace, the seat rotation mechanism includes a support bar, a support seat capable of rotating around the support bar, and a rotation limiting mechanism, the rotation limiting mechanism includes a first limiting portion disposed at a lower portion of the support seat, a second limiting portion moving up and down along the support bar, an elastic reset member for resetting the second limiting portion, and an anti-rotation mechanism for preventing the second limiting portion from rotating around the support bar, the second limiting portion abuts against the first limiting portion to block the first limiting portion from rotating, a stop seat is fixed on the support bar, one end of the elastic reset member abuts against the stop seat, and the other end of the elastic reset member abuts against the second limiting portion; the first limiting part is a non-circular limiting block arranged on the bottom surface of the supporting seat, the limiting block is cuboid, a limiting groove is formed in the inner wall of the second limiting part, and the cross section of the limiting groove is in a right-angled triangle shape matched with the angle of the cuboid; prevent changeing the mechanism including setting up the recess of preventing changeing on the spacing portion inner wall of second or prevent changeing the arch to and set up the protruding or prevent changeing the recess of preventing changeing on the bracing piece, prevent changeing the arch and can slide from top to bottom in preventing changeing the recess, prevent changeing the recess and be provided with a plurality of, prevent changeing protruding with prevent changeing the quantity and the position adaptation of recess, prevent changeing the recess inside wall with prevent changeing protruding counterbalance realization of changeing and prevent changeing.

7. A trolley as claimed in claim 2, characterized in that a pedal is connected to the diagonal brace, which pedal is located at the rear of the seat.

8. A trolley according to claim 6, characterized in that a diagonal brace connecting part is connected to the lower part of the support bar, and the diagonal brace connecting part is sleeved on the diagonal brace.

9. A trolley according to claim 4, characterized in that the side of the blocking part remote from the wheels extends in a direction remote from the wheels to form a mounting part, the mounting part is connected to the other end of the crosspiece connecting part, the mounting part is hollow, the mounting part is provided with a spring clip, the crosspiece connecting part is provided with a clip hole for the spring clip to extend out, and the joint of the mounting part and the blocking part is provided with a nut groove for accommodating a nut.

10. A trolley as claimed in claim 2, characterized in that the orthographic projection of the seat is in a central position of the chassis.