CN111332350A - Multistage extension formula handcart - Google Patents
Multistage extension formula handcart Download PDFInfo
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- CN111332350A CN111332350A CN202010347817.1A CN202010347817A CN111332350A CN 111332350 A CN111332350 A CN 111332350A CN 202010347817 A CN202010347817 A CN 202010347817A CN 111332350 A CN111332350 A CN 111332350A
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- plate
- expansion
- bearing plate
- bearing
- turning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/02—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving parts being adjustable, collapsible, attachable, detachable or convertible
- B62B3/022—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving parts being adjustable, collapsible, attachable, detachable or convertible folding down the body to the wheel carriage or by retracting projecting parts
Abstract
The invention discloses a multistage expansion type trolley, which comprises a cargo carrying platform, a grab bar arranged on the cargo carrying platform and used for pushing and pulling, and traveling wheels arranged on the lower side of the cargo carrying platform, wherein the cargo carrying platform is of a folding structure consisting of a bearing plate and expansion plates arranged on the left side and the right side of the bearing plate, the left expansion plate is hinged to the left edge of the bearing plate, the right expansion plate is hinged to the right edge of the bearing plate, and opening and closing limiting devices used for limiting the opening angle of the expansion plates are arranged between the expansion plates and the bearing plate; the left expansion plate and the right expansion plate are respectively provided with a tooth part which is matched with each other; drawing grooves with openings towards the rear side are formed in the bearing plate and the expansion plate, and drawing plates in sliding fit with the drawing grooves are arranged in the drawing grooves; the drawing plate on the expansion plate is a plate-turning type drawing plate structure. The invention can reduce the occupied space of the trolley, and the bearing area of the cargo platform can realize multi-stage expansion of folding, drawing and turning.
Description
Technical Field
The invention relates to a trolley, in particular to a multistage expansion type trolley.
Background
The cart is a transport vehicle that is manually pushed and pulled, and although the material transport technology is continuously developed, the cart is still used as an indispensable transport tool. The handcart has low cost, simple maintenance, convenient operation and light dead weight, is widely applied in production and life, can work in places where motor vehicles are inconvenient to use, and is very convenient to carry lighter objects in short distance.
The handcart generally comprises cargo platform, be used for the handrail pole of push-and-pull and install the walking wheel of cargo platform downside, and the cargo platform of current handcart generally chooses plate-type structure for use, and the handrail pole inclines upwards to fix on cargo platform. The existing trolley has the following defects: on one hand, the trolley occupies a larger space, on the other hand, the flat area of the cargo platform is certain, the bearing area is limited, the cargo platform cannot be expanded or the expansion area is limited, the cargo area of the cargo platform cannot be well utilized, the cargo carrying capacity is limited, and therefore carrying and using of the trolley are affected.
Disclosure of Invention
The invention aims to provide a multistage expansion type trolley, which can reduce the occupied space of the trolley, realize multistage expansion of the bearing area of a loading platform, and ensure the bearing area of the loading platform, thereby facilitating the carrying and use of the trolley.
In order to solve the technical problems, the invention adopts the following technical scheme:
a multi-stage expansion type trolley comprises a cargo carrying platform, a grab bar arranged on the cargo carrying platform and used for pushing and pulling and a traveling wheel arranged on the lower side of the cargo carrying platform, wherein the cargo carrying platform is of a folding structure consisting of a bearing plate and expansion plates arranged on the left side and the right side of the bearing plate, the expansion plate positioned on the left side of the bearing plate is called a left expansion plate, the left expansion plate is hinged to the left edge of the bearing plate, the expansion plate positioned on the right side of the bearing plate is called a right expansion plate, the right expansion plate is hinged to the right edge of the bearing plate, and opening and closing limiting devices used for limiting the opening angle of the expansion plate are arranged between; the left expansion plate and the right expansion plate are respectively provided with a tooth part which is matched with each other;
when the cargo platform is in an unfolded state, the left expansion plate is opened leftwards until the left expansion plate and the bearing plate are positioned on the same plane, and the corresponding opening and closing limiting device acts to limit the left expansion plate to be continuously opened; the right expansion plate is opened rightwards until the right expansion plate and the bearing plate are positioned on the same plane, and the corresponding opening and closing limiting device acts to limit the right expansion plate to be opened continuously;
when cargo platform is in fold condition, left expansion board and right expansion board all are folded for the bearing plate, and the tooth portion of left expansion board and right expansion board corresponds crisscross interlock, makes left expansion board and right expansion concatenation be a plane.
The left expansion plate is hinged to the upper edge of the left side of the bearing plate through a hinge, the right expansion plate is hinged to the upper edge of the right side of the bearing plate through a hinge, when the left expansion plate is opened leftwards or the right expansion plate is opened rightwards to be in the same plane with the bearing plate, the right side edge of the left expansion plate is abutted to the left side edge of the bearing plate, and the left side edge of the right expansion plate is abutted to the right side edge of the bearing plate, so that the opening and closing limiting device is formed.
Drawing grooves with openings towards the rear side are formed in the bearing plate and the expansion plate, drawing plates in sliding fit with the drawing grooves are arranged in the drawing grooves, and drawing limiting devices for limiting the drawing length of the drawing plates are arranged between the drawing plates and the drawing grooves;
the drawing plate on the expansion plate is a turning plate type drawing plate structure, the turning plate type drawing plate structure is a two-fold structure consisting of a substrate and a turning plate hinged with the substrate, the turning plate can be opened outwards relative to the substrate, and turning plate limiting devices for limiting the opening angle of the turning plate are arranged between the turning plate and the substrate;
when the turning plate type drawing plate structure is in an opening state, the turning plate is opened outwards to be in the same plane with the base plate, and the corresponding turning plate limiting device acts to limit the turning plate to be opened continuously; when the turning plate type drawing plate structure is in the splicing state, the turning plate is folded and spliced relative to the base plate.
The drawing limiting device comprises a long hole which is formed in the corresponding bearing plate or the corresponding expansion plate and communicated with the drawing groove, the length direction of the long hole is arranged along the drawing direction of the drawing plate, a sliding block in sliding fit with the long hole is arranged in the long hole, and the sliding block is fixedly connected with the corresponding drawing plate;
the long hole is arranged towards the lower side of the corresponding bearing plate or the expansion plate in the unfolding state.
The turning plate of the turning plate type drawing plate structure is hinged to the upper edge of the outer side of the base plate through a hinge, and when the turning plate is outwards opened to be in the same plane with the base plate, the inner edge of the turning plate is abutted against the outer edge of the base plate, so that the turning plate limiting device is formed.
The grab bar and the traveling wheels are both arranged on the bearing plate.
The upper side of the bearing plate is provided with a grab rail groove for accommodating a grab rail, and the root part of the grab rail is hinged and connected to the bottom of the grab rail groove; when the grab bar is retracted relative to the bearing plate, the grab bar is completely recessed in the grab bar groove.
The handrail rod is a U-shaped structure formed by splicing and combining a pull rod, an extension rod and a holding rod, the two pull rods are respectively hinged with the bearing plate, the extension rod and the pull rod are correspondingly provided with at least two extension rods, and the extension rods are detachably connected to the extension lines of the tail parts of the pull rods; the holding rod is arranged between the two pull rods, and the two ends of the holding rod are respectively detachably connected with the corresponding pull rod or the extension rod;
the upper side of the bearing plate is provided with a pull rod groove for accommodating a pull rod, and the root of the pull rod is hinged and connected to the bottom of the pull rod groove; the bearing plate and/or the expansion plate are/is also provided with a placing groove for accommodating the pull rod and/or the hand-held rod, and the shape of the placing groove is matched with that of the corresponding pull rod or hand-held rod;
after the pull rod, the extension rod and the holding rod in the grab rail are disassembled and separated, the extension rod and the holding rod are placed in the corresponding placing grooves, and the pull rod is folded relative to the bearing plate and is sunken in the pull rod groove.
A walking wheel groove for accommodating walking wheels is formed in the lower side of the bearing plate, a wheel mounting seat is fixedly arranged in the walking wheel groove, a walking wheel frame is hinged with the wheel mounting seat, and a walking wheel limiting device is arranged between the walking wheel frame and the wheel mounting seat;
when the travelling wheels are retracted relative to the bearing plate, the travelling wheels are completely recessed in the travelling wheel grooves;
when the walking wheel extends out relative to the bearing plate, the walking wheel frame rotates relative to the wheel mounting base until the walking wheel frame is perpendicular to the bearing plate, and at the moment, the walking wheel limiting device acts to limit the walking wheel frame to move.
The walking wheel limiting device comprises a limiting pin and a pin hole correspondingly formed in the walking wheel frame and the wheel mounting seat, when the walking wheel frame is perpendicular to the bearing plate, the pin hole in the walking wheel frame coincides with the pin hole in the wheel mounting seat, and the limiting pin sequentially penetrates through the two pin holes to limit the walking wheel frame.
The invention has the beneficial effects that:
the trolley is convenient to carry and flexible to use, the occupied space of the trolley can be reduced, the bearing area of the cargo platform can be expanded in a multi-stage mode of folding, pulling and turning, the bearing area of the cargo platform is ensured, and therefore the trolley is convenient to carry and use.
The folding and the expansion of the cargo platform are realized by the following structures: the cargo platform is a folding structure consisting of a bearing plate and expansion plates arranged on the left side and the right side of the bearing plate, the left expansion plate is hinged to the left edge of the bearing plate, the right expansion plate is hinged to the right edge of the bearing plate, and opening and closing limiting devices used for limiting the opening angle of the expansion plates are arranged between the expansion plates and the bearing plate; the left expansion plate and the right expansion plate are respectively provided with a tooth part which is matched with each other; when the cargo platform is in an unfolded state, the left expansion plate is opened leftwards until the left expansion plate and the bearing plate are positioned on the same plane, and the corresponding opening and closing limiting device acts to limit the left expansion plate to be continuously opened; the right expansion plate is opened rightwards until the right expansion plate and the bearing plate are positioned on the same plane, and the corresponding opening and closing limiting device acts to limit the right expansion plate to be opened continuously; when cargo carrying platform is in fold condition, left expansion board and right expansion board homogeneous phase are for the bearing plate jack-up, and the tooth portion of left expansion board and right expansion board corresponds crisscross interlock, makes left expansion board and right expansion concatenation be a plane to the shrink and the extension of cargo carrying platform's bearing area have been realized, flexibility and the maneuverability of increase use.
The drawing and expanding of the cargo platform are realized by the following structures: the bearing plate and the expansion plate are internally provided with drawing grooves with openings towards the rear side, the drawing grooves are internally provided with drawing plates in sliding fit with the drawing grooves, drawing limiting devices used for limiting the drawing length of the drawing plates are arranged between the drawing plates and the drawing grooves, the drawing plates in the bearing plate and the expansion plate are drawn backwards until the drawing limiting devices act, the drawing and the widening of the cargo platform are completed, and the expansibility of the cargo platform bearing area is further enhanced.
After the cargo platform is drawn and expanded, the cargo platform can be turned and expanded, and the cargo platform is realized by the following structure: the drawing plate on the expansion plate is a turning plate type drawing plate structure, the turning plate type drawing plate structure is a two-fold structure consisting of a substrate and a turning plate hinged with the substrate, the turning plate can be opened outwards relative to the substrate, and turning plate limiting devices for limiting the opening angle of the turning plate are arranged between the turning plate and the substrate; when the turning plate type drawing plate structure is in an opening state, the turning plate is opened outwards to be in the same plane with the base plate, and the corresponding turning plate limiting device acts to limit the turning plate to be opened continuously; when the turning plate type drawing plate structure is in the splicing state, the turning plate is folded and spliced relative to the base plate, so that the bearing area of the cargo platform is further expanded, and the cargo carrying capacity is improved.
The folding extension of cargo platform has increased its width that carries cargo, and its length that carries cargo has been increased in the pull extension to the extension board after the pull extension on still can further the expansion of turning up, through this tertiary formula extension, the occupation space of handcart when not only can reducing to receive up, and cargo platform's bearing area also obtains guaranteeing after the extension.
The upper side of the bearing plate is provided with a grab rail groove for accommodating a grab rail, and the root part of the grab rail is hinged and connected to the bottom of the grab rail groove; when the grab rail is folded up for the bearing plate, the grab rail sinks in the grab rail groove completely, and the folding design of the grab rail further reduces the occupied space of the handcart in the folding state and does not influence the original function of the handcart.
A walking wheel groove for accommodating walking wheels is formed in the lower side of the bearing plate, a wheel mounting seat is fixedly arranged in the walking wheel groove, a walking wheel frame is hinged with the wheel mounting seat, and a walking wheel limiting device is arranged between the walking wheel frame and the wheel mounting seat;
when the travelling wheels are retracted relative to the bearing plate, the travelling wheels are completely recessed in the travelling wheel grooves; when the walking wheel stretches out relative to the bearing plate, the walking wheel frame rotates relative to the wheel mounting base until the walking wheel frame is perpendicular to the bearing plate, at the moment, the walking wheel limiting device acts to limit the walking wheel frame to move, and due to the folding design of the walking wheel, the occupied space of the trolley in a folding state is further reduced, and the original function of the trolley is not influenced.
Drawings
FIG. 1 is a top view of an embodiment of the present invention in a folded state;
FIG. 2 is a bottom view of an embodiment of the present invention in a folded state;
FIG. 3 is a schematic view of the travel wheel of FIG. 2 in a stowed position;
FIG. 4 is a schematic view of the road wheels of FIG. 2 in an extended condition;
FIG. 5 is a top view of a first embodiment of the present invention in a collapsed, expanded configuration;
FIG. 6 is a front view of the first embodiment of the present invention in a folded and expanded state;
FIG. 7 is a rear view of an embodiment of the present invention in a collapsed expanded state;
FIG. 8 is a top view of the embodiment of the present invention in a folded, expanded and pulled expanded state;
FIG. 9 is a bottom view of the embodiment of the present invention in a folded, expanded, and extended state;
FIG. 10 is a top view of an embodiment of the present invention in a folded, expanded, drawn, and flipped up and expanded configuration;
FIG. 11 is a top view of the second embodiment of the present invention in folded, extended, pulled, and flipped open positions;
FIG. 12 is a top view of a third embodiment of the present invention in a collapsed, expanded configuration;
FIG. 13 is a top view of the grab bar of FIG. 12 after being assembled and assembled; .
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1 to 10, the multi-stage expandable stroller of the present embodiment includes a cargo platform, a grab bar 4 mounted on the cargo platform for pushing and pulling, and road wheels 5 mounted on the underside of the cargo platform, wherein the cargo platform can be folded and extended, and can be extended by pulling and turning.
The folding and the expansion of the cargo platform are realized by the following structures: the cargo platform is of a folding structure consisting of a bearing plate 1 and expansion plates arranged on the left side and the right side of the bearing plate 1, the expansion plate positioned on the left side of the bearing plate is called a left expansion plate 2, the left expansion plate 2 is hinged to the left edge of the bearing plate 1, the expansion plate positioned on the right side of the bearing plate 1 is called a right expansion plate 3, the right expansion plate 3 is hinged to the right edge of the bearing plate 2, and opening and closing limiting devices used for limiting the opening angle of the expansion plate are arranged between the expansion plate and the bearing plate; the left expansion plate 2 and the right expansion plate 3 are also respectively provided with a tooth part which is matched with each other.
When the cargo platform is in an unfolded state, the left expansion plate 2 is opened leftwards to be positioned on the same plane with the bearing plate 1, and at the moment, the corresponding opening and closing limiting device acts to limit the left expansion plate 2 to be continuously opened; the right expansion plate 3 is opened rightwards to be positioned on the same plane with the bearing plate 1, and at the moment, the corresponding opening and closing limiting device acts to limit the right expansion plate 3 to be opened continuously;
when cargo carrying platform is in fold condition, left expansion board 2 and right expansion board 3 homogeneous phase are for bearing plate 1 jack-up, and left expansion board 2 and right expansion board 3's tooth portion correspond crisscross interlock, make left expansion board 2 and right expansion concatenation 3 connect into a plane, cargo carrying platform's foldable structure has realized cargo carrying platform's bearing area's shrink and extension, increases flexibility and maneuverability of using.
In this embodiment, the left expansion plate 2 is hinged to the left upper edge of the bearing plate 1 through a hinge, the right expansion plate 3 is hinged to the right upper edge of the bearing plate 1 through a hinge, when the left expansion plate 2 is opened leftwards or the right expansion plate 3 is opened rightwards to be in the same plane with the bearing plate 1, the right edge of the left expansion plate 2 is abutted to the left edge of the bearing plate 1, and the left edge of the right expansion plate 3 is abutted to the right edge of the bearing plate 1, so that the opening and closing limiting device is formed.
The drawing and expanding of the cargo platform are realized by the following structures: drawing grooves with openings towards the rear side are formed in the bearing plate 1, the left expansion plate 2 and the right expansion plate 3, drawing plates 10 and 13 in sliding fit with the drawing grooves are arranged in the drawing grooves, and drawing limiting devices for limiting the drawing length of the drawing plates are arranged between the drawing plates 10 and 13 and the drawing grooves; the pulling plate is pulled out backwards until the pulling limiting device acts, so that the pulling and the widening of the cargo platform are finished, and the expansibility of the bearing area of the cargo platform is further enhanced.
In this embodiment, the drawing limiting device includes a long hole 11 that is provided on the corresponding bearing plate or the extension plate and is communicated with the drawing groove, the length direction of the long hole 11 is set along the drawing direction of the drawing plates 10 and 13, and the long hole 11 is set toward the lower side of the corresponding bearing plate or the extension plate in the unfolded state, a sliding block 12 that is in sliding fit with the long hole 11 is provided in the long hole 11, and the sliding block 12 is fixedly connected with the corresponding drawing plate.
After the cargo platform is drawn and expanded, the cargo platform can be turned and expanded, and the cargo platform is realized by the following structure: the drawing plate 13 on the expansion plate 2 and the expansion plate 3 is a turning plate type drawing plate structure, the turning plate type drawing plate structure is a two-folding structure consisting of a base plate 14 and a turning plate 15 hinged with the base plate 14, the turning plate 15 can be outwards opened relative to the base plate 14, and a turning plate limiting device used for limiting the opening angle of the turning plate is arranged between the turning plate 15 and the base plate 14. When the turning plate type drawing plate structure is in an opening state, the turning plate 15 is opened outwards to be positioned on the same plane as the base plate 14, and the corresponding turning plate limiting device acts to limit the turning plate 15 to be opened continuously; when the turning plate type drawing plate structure is in a splicing state, the turning plate 15 is folded and spliced relative to the base plate 14, so that the bearing area of the cargo platform is further expanded, and the cargo carrying capacity is improved.
In this embodiment, the turning plate 15 of the turning plate type pulling plate structure is hinged to the outer upper edge of the base plate 14 through a hinge, and when the turning plate 15 is opened outwards to be in the same plane as the base plate 14, the inner edge of the turning plate 15 is abutted to the outer edge of the base plate 14, so as to form the turning plate limiting device.
The folding extension of cargo platform has increased its width that carries cargo, and its length that carries cargo has been increased in the pull extension to the extension board after the pull extension on still can further the expansion of turning up, through this tertiary formula extension, the occupation space of handcart when not only can reducing to receive up, and cargo platform's bearing area also obtains guaranteeing after the extension.
In this embodiment, the grab bar 4 and the road wheels 5 are both mounted on the bearing plate.
The upside of bearing plate 1 is equipped with the handrail pole recess that is used for holding handrail pole 4, and the root of handrail pole 4 is articulated to be connected in the bottom of handrail pole recess, and the pin joint of handrail pole and 4 bearing plates is located the front side of bearing plate. When the grab bar 4 is retracted relative to the bearing plate, the grab bar is completely recessed in the grab bar groove. The folding design of the grab rail further reduces the occupied space of the handcart in a folding state, and does not influence the original function of the handcart.
The downside of bearing plate 1 is equipped with the walking wheel recess 6 that is used for holding walking wheel 5, and 6 internal fixations of walking wheel recess are equipped with wheel mount pad 7, and walking wheel carrier 8 is connected with wheel mount pad 7 is articulated, and is equipped with walking wheel stop device between walking wheel carrier 8 and the wheel mount pad 7.
The walking wheel limiting device comprises a limiting pin 9 and a pin hole correspondingly formed in the walking wheel frame and the wheel mounting seat, when the walking wheel frame is vertical to the bearing plate, the pin hole in the walking wheel frame is superposed with the pin hole in the wheel mounting seat, and the limiting pin 9 sequentially penetrates through the two pin holes to limit the walking wheel frame
When the walking wheels 5 are retracted relative to the bearing plate 1, the walking wheels 5 are completely recessed in the walking wheel grooves 6; when the walking wheel extends out relative to the bearing plate 1, the walking wheel carrier rotates relative to the wheel mounting base until the walking wheel carrier 8 is perpendicular to the bearing plate 1, and at the moment, the walking wheel limiting device acts to limit the walking wheel carrier 8 to move. The folding design of walking wheel further reduces the occupied space of handcart when fold condition, and does not influence its original function.
The trolley is convenient to carry and flexible to use, the occupied space of the trolley can be reduced, the bearing area of the cargo platform can be expanded in a multi-stage mode of folding, pulling and turning, the bearing area of the cargo platform is ensured, and therefore the trolley is convenient to carry and use.
The invention can be placed in a scene such as an automobile trunk for use.
Example two:
as shown in fig. 11, this embodiment is different from the first embodiment in that: the pin joint of bar 4 and bearing plate 1 not only is located the front side of bearing plate, and the pin joint of bar 4 and bearing plate 1 closes on the extension board setting of left and right sides respectively. The width of handrail pole has been increased in this design, is convenient for control push-and-pull handcart walking, improves job stabilization nature.
Example three:
as shown in fig. 12 and 13, this embodiment is different from the first embodiment in that: the handrail rod 4 is of a U-shaped structure formed by splicing and combining a pull rod 41, an extension rod 42 and a holding rod 43, the two pull rods 41 are respectively hinged with the bearing plate 1, at least two extension rods 42 are arranged corresponding to the pull rods 41, and the extension rods 42 are detachably connected to the extension lines of the tail parts of the pull rods 41; the holding rod 43 is disposed between the two pull rods 41, and two ends of the holding rod 43 are detachably connected to the corresponding pull rod 41 or the extension rod 42.
In this embodiment, the extension bar 42 is inserted into the tail of the corresponding pull rod 41 and fixed by an anchor ear or a fastening bolt transversely penetrated; the two ends of the holding rod 43 are inserted into the corresponding pull rod 41 or extension rod 42 respectively, and are fixed by an anchor ear or a fastening bolt transversely penetrated.
The upper side of the bearing plate 1 is provided with a pull rod groove 11 for accommodating a pull rod 41, and the root of the pull rod 41 is hinged to the bottom of the pull rod groove 11; the bearing plate 1 is also provided with a placing groove 12 for accommodating the extension bar 42 and the holding bar 43, and the shape of the placing groove 12 is matched with the corresponding extension bar 42 or the holding bar 43;
when the pull rod 41, the extension rod 42 and the holding rod 43 in the grab bar 4 are disassembled and separated, the extension rod 42 and the holding rod 43 are placed in the corresponding placing grooves, and the pull rod 41 is folded relative to the bearing plate 1 and is sunk in the pull rod groove 11.
The space occupied by the hand cart in the folded state is further reduced by the design of the grab rail, and the original function of the hand cart is not influenced.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms "front", "rear", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
Claims (10)
1. The utility model provides a multistage extension formula handcart, includes cargo platform, installs the handrail pole that is used for the push-and-pull on cargo platform and installs the walking wheel at cargo platform downside, its characterized in that: the cargo platform is of a folding structure consisting of a bearing plate and expansion plates arranged on the left side and the right side of the bearing plate, the expansion plate positioned on the left side of the bearing plate is called a left expansion plate, the left expansion plate is hinged to the left edge of the bearing plate, the expansion plate positioned on the right side of the bearing plate is called a right expansion plate, the right expansion plate is hinged to the right edge of the bearing plate, and opening and closing limiting devices used for limiting the opening angle of the expansion plate are arranged between the expansion plate and the bearing plate; the left expansion plate and the right expansion plate are respectively provided with a tooth part which is matched with each other;
when the cargo platform is in an unfolded state, the left expansion plate is opened leftwards until the left expansion plate and the bearing plate are positioned on the same plane, and the corresponding opening and closing limiting device acts to limit the left expansion plate to be continuously opened; the right expansion plate is opened rightwards until the right expansion plate and the bearing plate are positioned on the same plane, and the corresponding opening and closing limiting device acts to limit the right expansion plate to be opened continuously;
when cargo platform is in fold condition, left expansion board and right expansion board all are folded for the bearing plate, and the tooth portion of left expansion board and right expansion board corresponds crisscross interlock, makes left expansion board and right expansion concatenation be a plane.
2. The multi-level expandable cart of claim 1, wherein: the left expansion plate is hinged to the upper edge of the left side of the bearing plate through a hinge, the right expansion plate is hinged to the upper edge of the right side of the bearing plate through a hinge, when the left expansion plate is opened leftwards or the right expansion plate is opened rightwards to be in the same plane with the bearing plate, the right side edge of the left expansion plate is abutted to the left side edge of the bearing plate, and the left side edge of the right expansion plate is abutted to the right side edge of the bearing plate, so that the opening and closing limiting device is formed.
3. The multi-level expandable cart of claim 1, wherein: drawing grooves with openings towards the rear side are formed in the bearing plate and the expansion plate, drawing plates in sliding fit with the drawing grooves are arranged in the drawing grooves, and drawing limiting devices for limiting the drawing length of the drawing plates are arranged between the drawing plates and the drawing grooves;
the drawing plate on the expansion plate is a turning plate type drawing plate structure, the turning plate type drawing plate structure is a two-fold structure consisting of a substrate and a turning plate hinged with the substrate, the turning plate can be opened outwards relative to the substrate, and turning plate limiting devices for limiting the opening angle of the turning plate are arranged between the turning plate and the substrate;
when the turning plate type drawing plate structure is in an opening state, the turning plate is opened outwards to be in the same plane with the base plate, and the corresponding turning plate limiting device acts to limit the turning plate to be opened continuously; when the turning plate type drawing plate structure is in the splicing state, the turning plate is folded and spliced relative to the base plate.
4. The multi-level expandable cart of claim 3, wherein: the drawing limiting device comprises a long hole which is formed in the corresponding bearing plate or the corresponding expansion plate and communicated with the drawing groove, the length direction of the long hole is arranged along the drawing direction of the drawing plate, a sliding block in sliding fit with the long hole is arranged in the long hole, and the sliding block is fixedly connected with the corresponding drawing plate;
the long hole is arranged towards the lower side of the corresponding bearing plate or the expansion plate in the unfolding state.
5. The multi-level expandable cart of claim 3, wherein: the turning plate of the turning plate type drawing plate structure is hinged to the upper edge of the outer side of the base plate through a hinge, and when the turning plate is outwards opened to be in the same plane with the base plate, the inner edge of the turning plate is abutted against the outer edge of the base plate, so that the turning plate limiting device is formed.
6. The multi-level expandable cart of claim 1, wherein: the grab bar and the traveling wheels are both arranged on the bearing plate.
7. The multi-stage expandable cart of any of claims 1-6, wherein: the upper side of the bearing plate is provided with a grab rail groove for accommodating a grab rail, and the root part of the grab rail is hinged and connected to the bottom of the grab rail groove; when the grab bar is retracted relative to the bearing plate, the grab bar is completely recessed in the grab bar groove.
8. The multi-stage expandable cart of any of claims 1-6, wherein: the handrail rod is a U-shaped structure formed by splicing and combining a pull rod, an extension rod and a holding rod, the two pull rods are respectively hinged with the bearing plate, the extension rod and the pull rod are correspondingly provided with at least two extension rods, and the extension rods are detachably connected to the extension lines of the tail parts of the pull rods; the holding rod is arranged between the two pull rods, and the two ends of the holding rod are respectively detachably connected with the corresponding pull rod or the extension rod;
the upper side of the bearing plate is provided with a pull rod groove for accommodating a pull rod, and the root of the pull rod is hinged and connected to the bottom of the pull rod groove; the bearing plate and/or the expansion plate are/is also provided with a placing groove for accommodating the pull rod and/or the hand-held rod, and the shape of the placing groove is matched with that of the corresponding pull rod or hand-held rod;
after the pull rod, the extension rod and the holding rod in the grab rail are disassembled and separated, the extension rod and the holding rod are placed in the corresponding placing grooves, and the pull rod is folded relative to the bearing plate and is sunken in the pull rod groove.
9. The multi-stage expandable cart of any of claims 1-6, wherein: a walking wheel groove for accommodating walking wheels is formed in the lower side of the bearing plate, a wheel mounting seat is fixedly arranged in the walking wheel groove, a walking wheel frame is hinged with the wheel mounting seat, and a walking wheel limiting device is arranged between the walking wheel frame and the wheel mounting seat;
when the travelling wheels are retracted relative to the bearing plate, the travelling wheels are completely recessed in the travelling wheel grooves;
when the walking wheel extends out relative to the bearing plate, the walking wheel frame rotates relative to the wheel mounting base until the walking wheel frame is perpendicular to the bearing plate, and at the moment, the walking wheel limiting device acts to limit the walking wheel frame to move.
10. The multi-level expandable cart of claim 9, wherein: the walking wheel limiting device comprises a limiting pin and a pin hole correspondingly formed in the walking wheel frame and the wheel mounting seat, when the walking wheel frame is perpendicular to the bearing plate, the pin hole in the walking wheel frame coincides with the pin hole in the wheel mounting seat, and the limiting pin sequentially penetrates through the two pin holes to limit the walking wheel frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115071287A (en) * | 2022-06-16 | 2022-09-20 | 郑州新世纪数码科技股份有限公司 | Folding type printing platform and printer |
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| JP2005186737A (en) * | 2003-12-25 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Variable capacity type transporting cart |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115071287A (en) * | 2022-06-16 | 2022-09-20 | 郑州新世纪数码科技股份有限公司 | Folding type printing platform and printer |
| CN115071287B (en) * | 2022-06-16 | 2024-02-20 | 郑州新世纪数码科技股份有限公司 | Folding printing platform and printer |
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| CN111332350B (en) | 2021-10-29 |
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