WO2021047102A1 - 一种三合一推车 - Google Patents

一种三合一推车 Download PDF

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Publication number
WO2021047102A1
WO2021047102A1 PCT/CN2019/127541 CN2019127541W WO2021047102A1 WO 2021047102 A1 WO2021047102 A1 WO 2021047102A1 CN 2019127541 W CN2019127541 W CN 2019127541W WO 2021047102 A1 WO2021047102 A1 WO 2021047102A1
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WO
WIPO (PCT)
Prior art keywords
positioning
wheel
seat
rod
push
Prior art date
Application number
PCT/CN2019/127541
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English (en)
French (fr)
Inventor
盛晶
王荣民
何占丰
李宝
荆彦鹏
黄永平
潘鹏
邱向军
Original Assignee
金华市亚虎工具有限公司
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Application filed by 金华市亚虎工具有限公司 filed Critical 金华市亚虎工具有限公司
Publication of WO2021047102A1 publication Critical patent/WO2021047102A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B1/00—Hand carts having only one axis carrying one or more transport wheels; Equipment therefor
    • B62B1/02—Hand carts having only one axis carrying one or more transport wheels; Equipment therefor in which the wheel axis is disposed between the load and the handles
    • B62B1/04—Hand carts having only one axis carrying one or more transport wheels; Equipment therefor in which the wheel axis is disposed between the load and the handles involving parts being adjustable, collapsible, attachable, detachable, or convertible
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/06—Hand moving equipment, e.g. handle bars
    • B62B5/061—Hand moving equipment, e.g. handle bars both ends or periphery of cart fitted with handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B2205/00—Hand-propelled vehicles or sledges being foldable or dismountable when not in use
    • B62B2205/12—Collapsible wheels

Definitions

  • the invention belongs to the field of trolleys, and in particular relates to a three-in-one trolley, which has three use forms with different functions, namely a flat trolley, a luggage trolley, and a workbench.
  • the trolley can be used to carry goods, luggage, articles, etc.
  • the structure of the trolley is stable and the function is relatively single.
  • the technicians of this unit have made improvements to the structure of each part of the trolley, including foldable wheels and reversible handles. Through structural deformation, it can provide three different functional usage forms, namely flatbed carts, luggage carts, and workbenches.
  • the present invention is mainly aimed at the multi-functional needs of the trolley, and invented a three-in-one trolley; among them, the improvement of the wheel structure is mainly that the torsion spring drives the wheel to automatically rotate and fold, and at the same time, a set position is added between the two wheels that are relatively rotated and folded Mechanism, the positioning mechanism mainly realizes the unfolding and positioning of the wheel through the mutual interference between the two ends of the rod and the wheel seat and the positioning of the jack.
  • the structural improvement of the handle is mainly by turning the U-shaped handle 180 degrees to turn the cart function into a workbench function; first, the handle rotates with the second pin as the center of rotation, and then rotates the positioning piece and push-pull rod end
  • the insertion of the part forms the positioning; when no external force is applied, the end of the push-pull rod is inserted into the positioning groove of the rotating positioning member corresponding to the elastic pull of the spring to form a positioning; when an external force acts on the push-pull rod to make it After moving outwards, the end of the push-pull rod is separated from the positioning groove, the rotating positioning piece and the handle can rotate freely; when the handle and the rotating positioning piece are in the proper position, the external pulling force on the push-pull rod is eliminated, and the spring is Under the action, the end of the push-pull rod is re-inserted into the positioning groove and repositioned.
  • a three-in-one cart including a loading platform, two mounting rods are respectively connected to opposite sides of the loading platform, and each mounting rod
  • the parts near the two ends are provided with wheel assemblies, which are characterized in that the wheel assemblies include a bearing seat fixed under the mounting rod, a first pin shaft is connected to the bearing seat, and a torsion spring is sleeved on the first pin shaft.
  • the first pin is connected to the wheel seat, and the wheel seat is connected to the wheel. Under the action of the torsion spring, the wheel seat and the wheel automatically turn to be close to the load platform;
  • Positioning mechanism with the wheels in the unfolded state is
  • the two wheels rotate relatively to the same plane and are in a folded state; and the positioning mechanism between the two wheels is manually flipped to drive the two wheel seats and wheels to synchronize They are in an unfolded state after being flipped 90 degrees.
  • Each mounting rod has a section of hollow shaft sleeve type mounting seat near the two ends, and a telescopic seat is sleeved on the open end of the mounting seat.
  • the telescopic seat includes a movable frame that extends into the mounting seat and is exposed to the installation.
  • the push-pull seat at the end of the seat is provided with an elastic member in the movable frame; there is a second pin that traverses the mounting seat and the movable frame vertically at the same time, and one end of the elastic member is in contact with the second pin, then the movable frame It can be elastically telescopic and translational relative to the mounting seat; a push-pull rod is fixedly connected between the two parallel push-pull seats, and the push-pull rod crosses the push-pull seat and has an exposed end.
  • the movable frame Under the action of the elastic member, the movable frame is pushed to the depth of the mounting seat, and the push-pull seat conflicts with the end of the mounting seat; when an external force acts on the push-pull seat, the external force needs to overcome the force of the spring to make the push-pull seat be Pull out; the external force acts on the push-pull rod and simultaneously drives the two telescopic seats to translate outward. When the external force disappears, the two telescopic seats automatically return to the initial position under the action of the elastic member (spring).
  • the second pin shaft is close to the open end of the mounting seat, and a rotating positioning piece is connected to the outer end of the second pin shaft.
  • a number of positioning grooves are provided on the edge of the rotating positioning piece. The positioning grooves are arranged in a circle, and the push-pull rod is exposed The end can be inserted into the positioning groove of the rotary positioning member.
  • a handle is connected to two rotary positioning parts at the same end, the handle includes two parallel rockers and a cross bar connected between the ends of the two rockers, and the ends of the two rockers are respectively connected to the rotary positioning parts. ;
  • the handle rotates with the second pin shaft as the center of rotation, and the rotating positioning member and the handle rotate synchronously.
  • the positioning mechanism includes a positioning sleeve between the two wheel seats, a support rod connected to the positioning sleeve, the support rod is pivotally hinged with the mounting rod through a rotating shaft, or the support rod rotates with the load platform through the rotating shaft Hinged; the two ends of the positioning sleeve can be in contact with the two wheel seats respectively.
  • the turning of the positioning mechanism is completed by manual operation.
  • the positioning sleeve When folded, the positioning sleeve is close to the loading platform, and the positioning sleeve is between the two installation rods and is roughly flush with the two installation rods; when unfolding and positioning, positioning The sleeve is gradually turned upwards, thereby gradually spreading the folded wheel seat and the wheel outwards until the positioning sleeve is perpendicular to the wheel seat.
  • each telescopic rod has an axially outwardly convex positioning column, and the inwardly facing ends of the two telescopic rods Both are connected with an operating handle, and a spring is connected between the two operating handles; the positioning posts at the outer end of the telescopic rod can be exposed at both ends of the positioning sleeve; at the same time, the wheel seat has a surface facing the positioning mechanism For the positioning hole, the positioning post exposed to the positioning sleeve can be inserted into the positioning hole correspondingly.
  • the telescopic rods in the positioning sleeve extend outward under the action of the spring, and the positioning posts at the end are correspondingly inserted into the positioning holes to maintain the stability of the unfolded state of the wheel;
  • the operating handle is manually controlled to drive the two telescopic rods to shrink inward, while the positioning column shrinks inward, so that the positioning sleeve and the wheel seat are separated from each other, and the wheel automatically rotates and folds again under the action of the torsion spring.
  • the middle side wall of the positioning sleeve has an opening, and the operating handle passes through the opening and is exposed to the positioning sleeve; at the same time, the middle of each segment of the telescopic rod is vertically connected to a limiting post, and at the same time, A long waist hole is provided at the position corresponding to the side wall of the positioning sleeve and the limiting column, and one end of the limiting column passes through the long waist hole and is exposed to the positioning sleeve.
  • the handle parts are exposed for easy operation, and the positioning column is driven to retract by reducing the distance between the two operation handle parts.
  • the expansion and contraction range of the telescopic rod is restricted by the cooperation of the limit post and the long waist hole.
  • an engagement mechanism for restricting the expansion and contraction of the push-pull rod is provided between the push-pull rod and the mounting seat;
  • the engagement mechanism includes a flip plate connected to the push-pull rod, and the flip plate extends from one end of the push-pull rod to the other end and turns over.
  • the two ends of the plate extend toward the end of the pin shaft exposed on the mounting seat to form a clamping plate, and the clamping plate is provided with a clamping groove, and the clamping groove can be clamped on the end of the pin shaft.
  • the flip plate needs to be rotated to disengage the card slot from the second pin, and after the restriction between the push-pull rod and the mounting seat is eliminated, the push-pull rod can be pulled out.
  • the locking mechanism can prevent the push-pull rod from accidentally shaking or being accidentally pulled out, resulting in unstable handle during use.
  • a section of rotating shaft is movably connected between the middle parts of the two parallel mounting rods, and the supporting rod is connected between the rotating shaft and the positioning sleeve; at the same time, the lower surface of the loading platform corresponds to Both the rotating shaft and the supporting rod are provided with a concave containing groove, and the rotating shaft and the supporting rod can be placed in the containing groove; when the wheel is in the automatic folding state, the positioning sleeve and the supporting rod are on the loading platform Between the wheel and the wheel, in order to maintain the flatness between the wheel, the positioning mechanism and the loading platform, the rotating shaft and the support rod are correspondingly embedded in the containing groove on the lower surface of the loading platform.
  • the inward-facing side wall of the mounting seat has a through hole, and when the positioning sleeve is separated from the wheel seat and turned down to be flush with the installation rod, the positioning post at the end of the positioning sleeve is inserted into the through hole.
  • the purpose is to keep the entire positioning mechanism in a stable folded state without shaking randomly.
  • a load board is connected between the two parallel rockers, and at the same time, the joint of the rocker and the cross bar of the handle has a vertical convex foot pad.
  • the load board is at the lower end and is used to carry luggage items, while the foot pads and wheels are in contact with the ground.
  • the elastic member is set as a spring; the second pin is sleeved with a short sleeve, one end of the spring is in contact with or connected to the short sleeve, and the other end of the spring is connected to the end of the movable frame member.
  • the second pin shaft and the end sleeve can rotate relatively, and the expansion and contraction of the spring does not affect the rotation of the second pin shaft.
  • the rotating positioning member is arranged in a cylindrical shape, and the pin shaft is vertically fixedly connected to the center of the rotating positioning member; the positioning groove is formed by the recessed side wall of the rotating positioning member, the positioning groove is close to the mounting seat and the positioning groove is close to the installation One end of the seat is open.
  • the end of the push-pull rod is inserted into the positioning groove from the outer side of the rotating positioning member.
  • the transition portion between the push-pull seat and the movable frame body has an outwardly convex limiting protrusion, and the limiting protrusion can conflict with the end of the mounting seat.
  • the present invention has the following advantages:
  • the wheel of the present invention can be completely folded and hidden, and at the same time, the handle can be rotated 180 degrees, thereby transforming into a U-shaped flat cart, an L-shaped luggage cart, and a workbench, which has versatility; the present invention is driven by a torsion spring to automatically rotate and fold At the same time, a setting mechanism is added between the two wheels that are folded in relative rotation.
  • the positioning mechanism mainly realizes the unfolding and positioning of the wheels through the conflict between the two ends of the rod and the wheel seat and the positioning of the jack. Manual operation is convenient and fast, and the connection reliable.
  • the handle of the present invention rotates with the pin shaft as the center of rotation, and then forms positioning by inserting the rotating positioning member and the end of the push-pull rod.
  • the telescopic recovery of the push-pull rod is realized by the spring in the telescopic seat; when no external force is applied, Only under the action of the elastic pulling force of the spring, the end of the push-pull rod is inserted into the positioning groove of the rotating positioning member to form a positioning; when an external force acts on the push-pull rod to make it translate outward, the end of the push-pull rod is separated from the positioning groove , The rotating positioning piece and the handle can rotate freely; when the handle and the rotating positioning piece are in the proper position, the external pulling force on the push-pull rod is eliminated, and the end of the push-pull rod is reinserted into the positioning groove under the action of the spring. Positioning, manual operation, one step in place, reliable connection.
  • Figure 1 is a schematic diagram of the structure of the present invention
  • Figure 2 is a schematic diagram of the wheel assembly and positioning mechanism of the present invention
  • Figure 3 is a schematic diagram of the wheel assembly and positioning mechanism of the present invention.
  • Figure 4 is a bottom view of the wheel assembly and positioning mechanism of the present invention in a folded state
  • Figure 5 is a cross-sectional view of the positioning sleeve of the present invention.
  • Figure 6 is a schematic diagram of the handle rotation positioning structure of the present invention.
  • Figure 7 is a side view of the handle rotation positioning structure of the present invention.
  • Figure 8 is a cross-sectional view of the mounting seat, telescopic seat, and rotating positioning member of the present invention.
  • Figure 9 is a cross-sectional view of the mounting base and the telescopic base of the present invention.
  • Figure 10 is a schematic view of the folded state of the present invention.
  • Figure 11 is a schematic diagram of the state of the luggage trolley of the present invention.
  • Fig. 12 is a schematic diagram of the state of the workbench of the present invention.
  • the numbers in the figure are: 1. Loading platform; 11. Mounting rod; 12. Retaining groove; 2. Wheel assembly; 20. Bearing seat; 21. First pin; 22. Torsion spring; 23. Wheel seat; 24 3. Wheel; 3. Positioning mechanism; 31. Positioning sleeve; 32. Support rod; 33. Telescopic rod; 34. Positioning column; 35. Handle; 36. Spring; 37. Limiting column; 38. Long waist hole 39. Rotating shaft; 4. Mounting seat; 41. Through hole; 5. Telescopic seat; 51. Moving frame; 52. Push-pull seat; 53, Elastic member; 54, second pin shaft; 55, Push-pull rod; 6. Rotating positioning piece; 61, positioning slot; 7, handle, 71, rocker; 72, cross bar; 73, carrying plate; 74, foot pad; 8, clamping mechanism; 81, turning plate; 82, clamping plate.
  • a three-in-one cart has a rectangular flat-shaped loading platform 1.
  • the two long sides of the loading platform 1 are fixedly connected to a mounting rod 11, each mounting rod A wheel assembly 2 is installed on the parts near both ends of 11.
  • each wheel assembly 2 includes a bearing seat 20 fixed under the mounting rod 11, a first pin shaft 21 is connected to the bearing seat 20, and a ring sleeve of the first pin shaft 21 is twisted. At the same time, a wheel seat 23 is connected to the first pin shaft 21, and a wheel 24 is connected to the wheel seat 23. Under the action of the torsion spring 22, the wheel seat 23 and the wheel 24 automatically turn to be close to the loading platform 1 below.
  • the wheels 24 in one set of wheel assemblies 2 use universal wheels.
  • the two wheel seats 23 drive the wheels 24 to rotate to the same plane and are in a folded state; in order to drive the two wheel seats 23 to drive the wheels 24 to turn 90 degrees, they are in In the unfolded state, a positioning mechanism 3 is provided between the two wheel bases 23, and the turning positioning mechanism 3 drives the wheel base 23 to turn outwards and open, and maintain the wheel base 23 and the wheel 24 in the unfolded state.
  • the positioning mechanism 3 is mainly composed of a positioning sleeve 31, a support rod 32, and a rotating shaft 39; wherein the rotating shaft 39 is vertically connected between the middle of two parallel mounting rods 11, and the rotating shaft 39 can rotate on its own. ;
  • a section of support rod 32 is vertically fixed at the positions near the two ends of the shaft 39, and the positioning sleeve 31 is also vertically fixed to the ends of the two support rods 31; with the rotation of the shaft 39, the support rod 32 and the positioning sleeve are driven 31 is turned over, and the positioning sleeve 31 can be located between the two wheel seats 23.
  • the positioning sleeve 31 is a hollow round tube.
  • the positioning sleeve 31 has two axially extending telescopic rods 33 inside the positioning sleeve 31, and the outward end of each telescopic rod 33 has an axially convex positioning.
  • Column 34, the inward ends of the two telescopic rods 33 are vertically and fixedly connected to an operating handle 35, and a section of spring 36 is connected between the two operating handles 35; the middle side wall of the positioning sleeve 31 has an opening, two The operating handle 35 passes through the opening and is exposed from the positioning sleeve 31.
  • each section of the telescopic rod 33 is vertically connected to a limit post 37.
  • a long waist hole 38 is provided on the side wall of the positioning sleeve 31 and the position corresponding to the limit post 37, and one end of the limit post 37 passes through The long waist hole 38 is exposed from the positioning sleeve 31; the limiting post 37 cooperates with the long waist hole 38 to limit the expansion and contraction range of the telescopic rod 33 and the positioning post 34.
  • the positioning post 34 at the outer end of the telescopic rod 33 can be extended outward and exposed at both ends of the positioning sleeve 31; and, when the wheel seat 23 and the wheel 24 are maintained in the unfolded state, the exposed positioning The column 34 is correspondingly inserted into the positioning hole on the plate of the wheel seat 23.
  • the lower surface of the loading platform 1 and the parts corresponding to the rotating shaft 39 and the supporting rod 32 have a concave containing groove 12, and the rotating shaft 39 and the supporting rod 32 can be placed in the containing groove 12;
  • the inwardly facing side wall of the mounting base 4 has a through hole 41, and when the positioning sleeve 31 is separated from the wheel base 23 and turned down to be flush with the mounting rod 11, the positioning post 34 at the end of the positioning sleeve 31 is inserted into the through hole 41 correspondingly in.
  • each mounting rod 11 has a section of hollow square tube sleeve type mounting seat 4 near the two ends, and a telescopic seat is sleeved on the open end of the mounting seat 4 5;
  • the telescopic seat 5 is mainly composed of a movable frame 51, a push-pull seat 52, and a spring member 6, wherein the movable frame 51 is set as a rectangular parallelepiped frame, and the movable frame 51 extends into the inside of the mounting seat 4 and can follow The axial translation of the mounting seat 4; the push-pull seat 52 is exposed at the end of the mounting seat 4, the transition part between the push-pull seat 52 and the moving frame 51 has a convex limit protrusion, and the limit protrusion can be connected to the end of the mounting seat 4.
  • the elastic member 6 adopts a section of spring.
  • the push-pull seat 52 and the movable frame 51 are made in one piece, and the movable frame 51 is composed of multiple edges.
  • the parallel edges and the edges form a sliding groove.
  • a second pin 54 is also vertical and horizontal.
  • the second pin shaft 54 traverses the sliding groove; at the same time, a short sleeve is sleeved on the second pin 54 and the short shaft sleeve is in the moving frame 51, and the One end of the spring is in contact with or connected to the short sleeve, and the other end of the spring is in contact with or connected to the end of the movable frame member 51; then, under the action of the spring, the movable frame 51 can elastically telescope and translate relative to the mounting seat 4.
  • a push-pull rod 55 is fixedly connected to the same end of the loading platform 1 and two parallel push-pull seats 51.
  • the push-pull rod 55 crosses the push-pull seat 51 and the ends are exposed.
  • the second pin shaft 54 is close to the open end of the mounting seat 4, and a rotating positioning member 6 is connected to the outer end of the second pin shaft 54.
  • the rotating positioning member 6 is set in a flat cylinder, and the second pin shaft 54 is fixedly connected In the position of the central axis of the rotary positioning member 6; there are a plurality of positioning grooves 61 on the edge of the rotary positioning member 6, and the positioning grooves 61 are arranged in a circle; each positioning groove 61 is formed by the recessed side wall of the rotary positioning member 6, positioning The groove 61 is close to the mounting base 4 and the positioning groove 61 is close to the end of the mounting base 4 opening; the exposed part of the push-pull rod 55 is correspondingly embedded in the positioning groove 61 of the rotary positioning member 6.
  • a U-shaped handle 2 is fixedly connected to two parallel rotating positioning members 6.
  • the U-shaped handle 2 includes two parallel rockers 21 and a cross bar 22 connected between the ends of the two rockers 21; two rockers The end of the rod 21 is fixedly connected to the rotation positioning member 6, and the connecting part of the two is far away from the mounting seat 4.
  • an engaging mechanism 8 is connected between the push-pull rod 55 and the mounting base 4 to limit the expansion and contraction of the push-pull rod 55; specifically, the engaging mechanism 8 is mainly composed of a flip plate 81 and Two clamping plates 82 are formed; wherein the flip plate 81 is fixedly connected to the push-pull rod 55, and the flip plate 81 extends from one end of the push-pull rod 55 to the other end, and the two clamping plates 82 are respectively facing from both ends of the flip plate 81
  • the end of the second pin 54 exposed to the mounting seat 4 is formed by an extension.
  • the end of the locking plate 82 close to the second pin 54 has a slot, and the slot can be engaged with the end of the second pin 54 . As long as the locking mechanism 8 is unlocked first, the handle 7 can be rotated.
  • Both ends of the loading platform 1 are connected to a U-shaped handle 7, wherein a loading plate 73 is connected between the two parallel rockers 71 of the U-shaped handle 7. At the same time, the rocker 71 and the cross bar 72 of the handle 7 There is a vertical convex foot pad 74 at the connection point; when the cart is deformed into an L-shaped luggage trolley, the loading board 73 is located below for loading, and the foot pad 74 and the wheels 24 are supported on the ground.
  • the wheel seat, wheel, and positioning mechanism can be completely folded and stored, and at the same time, the handle can be rotated to the loading platform, which is easy to pack, store and transport.

Abstract

一种三合一推车，包括载物平台（1），载物平台（1）的位置相对的两侧分别连接一安装杆件（11），每一安装杆件（11）的靠近两端的部分均设置有车轮组件（2），车轮组件（2）包括固定于安装杆件（11）之下的轴承座（20），轴承座（20）上连接第一销轴（21），第一销轴（21）上环套一段扭簧（22），同时，第一销轴（21）上连接车轮座（23），车轮座（23）上连接车轮（24），在扭簧（22）的作用下车轮座（23）和车轮（24）自动翻转至靠近载物平台（1）；位于同一端的两车轮组件（2）之间设置有用于维持车轮座（23）和车轮（24）处于展开状态的定位机构（3）。该三合一推车通过结构变形，可提供三种不同功能的使用形态，分别是平板推车、行李车、工作台。

Description

一种三合一推车 技术领域
本发明属于手推车领域，具体涉及一种三合一推车，具有三种不同功能的使用形态，分别是平板推车、行李车、工作台。
背景技术
手推车可用于搬运货物、行李、物品等，通常手推车的结构是稳定不变的，功能也相对单一。为了满足使用者对手推车的多功能要求，本单位的技术人员对手推车的各部分结构进行了改进，包括可折叠的车轮、可翻转的把手等。通过结构变形，可提供三种不同功能的使用形态，分别是平板推车、行李车、工作台。
发明内容
本发明主要针对手推车的多功能需求，发明了一种三合一推车；其中，车轮结构的改进主要是由扭簧带动车轮自动旋转折叠，同时，在相对旋转折叠的两车轮之间增设定位机构，定位机构主要通过杆件的两端与车轮座的相互抵触和插孔定位来实现车轮的展开定位。而把手的结构改进主要是通过将U型把手进行180度翻转，使推车功能转变为工作台功能；首先，把手以第二销轴为旋转中心进行旋转，然后通过旋转定位件和推拉杆端部的插接形成定位；在没有受到外力作用时，仅仅在弹簧的弹性拉力作用下，推拉杆的端部对应插入旋转定位件的定位槽中，形成定位；当有外力作用于推拉杆使其向外平移后，推拉杆的端部与定位槽脱离，则旋转定位件和把手可自由旋转；当把手和旋转定位件处于适当位置后，消除对推拉杆的外拉作用力，则在弹簧的作用下推拉杆的端部重新插入定位槽中，重新定位。
本发明的上述技术问题是通过以下技术方案得以实施的：一种三合一推车，包括载物平台，载物平台的位置相对的两侧分别连接一安装杆件，每一安装杆件的靠近两端的部分均设置有车轮组件，其特征在于，所述车轮组件包括固定于安装杆件之下的轴承座，轴承座上连接第一销轴，第一销轴上环套一段扭簧，同时， 第一销轴上连接车轮座，车轮座上连接车轮，在扭簧的作用下车轮座和车轮自动翻转至靠近载物平台；位于同一端的两车轮组件之间设置有用于维持车轮座和车轮处于展开状态的定位机构。在扭簧的作用下，且没有受到其他任何外力作用时，两车轮相对旋转至处于同一平面，处于折叠状态；而位于两车轮之间的定位机构，通过手动翻转来驱使两车轮座和车轮同步各自翻转90度后处于展开状态。
每一安装杆件的靠近两端的部位均具有一段空心的轴套式的安装座，在安装座的开口端套接一伸缩座，伸缩座包括伸入安装座内部的移动框体、外露于安装座端部的推拉座，在移动框体内设置弹性件；有一第二销轴同时垂直横穿安装座和移动框体，所述弹性件的一端与第二销轴抵触，则所述移动框体能够相对于安装座进行弹性伸缩平移；所述两件平行的推拉座之间固定连接推拉杆，推拉杆横穿推拉座且端部外露。在弹性件的作用下，移动框体被推至安装座的深处，推拉座与安装座的端部抵触；当有外力作用于推拉座时，外力需要克服弹簧的作用力，使推拉座被向外拉出；外力作用于推拉杆，同时带动两个伸缩座向外平移，当外力消失后，两个伸缩座在弹性件(弹簧)的作用下自动回复到初始位置。
所述第二销轴靠近安装座的开口端，在第二销轴的外端连接一旋转定位件，旋转定位件的边缘设置有若干定位槽，定位槽呈圆周排布，则推拉杆的外露的端部能够嵌入旋转定位件的定位槽中。
位于同一端的两旋转定位件上连接把手，所述把手包括两件平行的摇杆、连接于两件摇杆的端部之间的横杆，两摇杆的端部分别对应连接于旋转定位件；把手以第二销轴为旋转中心进行旋转，而旋转定位件和把手同步旋转。
作为优选，所述定位机构包括位于两件车轮座之间的定位套管、连接与定位套管的支撑杆，支撑杆通过转轴与安装杆件旋转铰接，或者支撑杆通过转轴与载物平台旋转铰接；所述定位套管的两端能够分别与两车轮座抵触。定位机构的翻转由手动操作完成，折叠状态时，定位套管紧贴载物平台，定位套管处于两件安装杆件之间且大致与两件安装杆件齐平；进行展开定位时，定位套管逐渐向上翻转，从而逐渐将折叠的车轮座和车轮向外撑开，直至定位套管与车轮座垂直抵触。
作为优选，所述定位套管的内部设置有两段伸缩杆件，每一伸缩杆件的朝外的端部均具有轴向外凸的定位柱，两段伸缩杆件的朝内的端部均连接一操作手柄件，两操作手柄件之间连接一段弹簧；所述伸缩杆件外端的定位柱能够外露于定位套管的两端；同时，所述车轮座朝着定位机构的板面具有定位孔，则外露于定位套管的定位柱能够对应插入定位孔中。当定位套管向上翻转至与车轮座垂直时，定位套管内的伸缩杆件在弹簧的作用下向外伸出，而端部的定位柱对应插入定位孔中，保持车轮展开状态的稳定；进行折叠操作时，手动控制操作手柄，带动两件伸缩杆件向内缩，同时定位柱内缩，使定位套管与车轮座相互脱离，车轮在扭簧的作用下再次自动旋转折叠。
作为优选，所述定位套管的中部侧壁具有开口，所述的操作手柄件穿过开口且外露于定位套管；同时，每一段伸缩杆件的中部垂直连接一限位柱，同时，在定位套管的侧壁与限位柱对应的部位设置一段长腰孔，则限位柱的一端穿过该长腰孔且外露于定位套管。手柄件外露，便于操作，通过缩小两个操作手柄件之间的间距来带动定位柱内缩。又通过限位柱和长腰孔的配合来限制伸缩杆件的伸缩幅度。
作为优选，所述推拉杆和安装座之间设置有用于限制推拉杆伸缩的卡合机构；卡合机构包括连接于推拉杆的翻转板，翻转板从推拉杆的一端延延伸至另一端，翻转板的两端朝着外露于安装座的销轴的端部延伸形成卡合板，卡合板上设置有卡槽，卡槽能够卡合在销轴的端部。进行把手旋转时，首先需要转动翻转板，使卡槽与第二销轴脱离，消除推拉杆和安装座之间的限制后，推拉杆才能够被向外拉出。具有卡合机构能够避免推拉杆意外晃动或者意外被拉出，导致使用时把手不稳定。
作为优选，所述两件平行的安装杆件的中部之间活动连接一段转轴，该转轴与所述定位套管之间连接所述的支撑杆；同时，所述载物平台的下表面且对应所述转轴和所述支撑杆的部位均设置有内凹的容纳槽，所述转轴和支撑杆能够置于容纳槽中；当车轮处于自动折叠状态时，定位套管和支撑杆处于载物平台和车轮 之间，为了维持车轮、定位机构、载物平台之间的平整，转轴和支撑杆对应嵌入载物平台下表面的容纳槽中。所述安装座的朝内的侧壁具有通孔，则定位套管脱离车轮座后下翻至与安装杆件齐平时，定位套管端部的定位柱插入通孔中。目的是为了保持整个定位机构能够稳定的处于折叠状态，不会随意晃动。
作为优选，其中一件把手，两平行的摇杆之间连接有载物板，同时，该把手的摇杆和横杆的连接处具有垂直外凸的脚垫。当推车变形为L型的行李车时，载物板处于下端且用于承载行李物品，而脚垫和车轮与地面接触。
作为优选，所述弹性件设置为一段弹簧；所述第二销轴上环套一段短轴套，所述弹簧的一端与该短轴套抵触或连接，弹簧的另一端与移动框件的端部抵触或连接。第二销轴和端轴套可相对旋转，弹簧的伸缩不影响第二销轴的旋转。
作为优选，所述旋转定位件设置为圆柱形，销轴垂直固定连接于旋转定位件的中心；所述定位槽由旋转定位件的侧壁内凹形成，定位槽靠近安装座且定位槽靠近安装座的一端开口。进行插孔定位时，推拉杆的端部从旋转定位件的外侧平移嵌入定位槽中。
作为优选，所述推拉座与移动框体的过渡部位具有外凸的限位凸起，限位凸起能够与安装座的端部抵触。
综上所述，本发明与现有技术相比具有如下优点：
本发明的车轮可完全折叠隐藏，同时，把手可180度旋转，从而变形成U型平板推车、L型行李推车、工作台，具有多功能性；本发明由扭簧带动车轮自动旋转折叠，同时，在相对旋转折叠的两车轮之间增设定位机构，定位机构主要通过杆件的两端与车轮座的相互抵触和插孔定位来实现车轮的展开定位，手动操作，方便快捷，且连接牢靠。本发明的把手以销轴为旋转中心进行旋转，然后通过旋转定位件和推拉杆端部的插接形成定位，推拉杆的伸缩回复由伸缩座内的弹簧来实现；在没有受到外力作用时，仅仅在弹簧的弹性拉力作用下，推拉杆的端部对应插入旋转定位件的定位槽中，形成定位；当有外力作用于推拉杆使其向外平移后，推拉杆的端部与定位槽脱离，则旋转定位件和把手可自由旋转；当把手 和旋转定位件处于适当位置后，消除对推拉杆的外拉作用力，则在弹簧的作用下推拉杆的端部重新插入定位槽中，重新定位，手动操作，一步到位，连接牢靠。
附图说明
图1是本发明的结构示意图；
图2是本发明的车轮组件及定位机构示意图；
图3是本发明的车轮组件及定位机构示意图；
图4是本发明的车轮组件及定位机构折叠状态时的仰视图；
图5是本发明的定位套管的剖视图；
图6是本发明的把手旋转定位结构的示意图；
图7是本发明的把手旋转定位结构的侧视图；
图8是本发明的安装座、伸缩座、旋转定位件的剖视图；
图9是本发明的安装座和伸缩座的剖视图。
图10是本发明的折叠状态示意图；
图11是本发明的行李推车状态示意图；
图12是本发明的工作台状态示意图。
图中标号为：1、载物平台；11、安装杆件；12、容纳槽；2、车轮组件；20、轴承座；21、第一销轴；22、扭簧；23、车轮座；24、车轮；3、定位机构；31、定位套管；32、支撑杆；33、伸缩杆件；34、定位柱；35、手柄件；36、弹簧；37、限位柱；38、长腰孔；39、转轴；4、安装座；41、通孔；5、伸缩座；51、移动框体；52、推拉座；53、弹性件；54、第二销轴；55、推拉杆；6、旋转定位件；61、定位槽；7、把手、71、摇杆；72、横杆；73、载物板；74、脚垫；8、卡合机构；81、翻转板；82、卡合板。
具体实施方式
下面结合附图和实施例对本发明进一步说明。
实施例1：
如图1所示，一种三合一推车，有一长方形平板状的载物平台1，载物平台 1的位置相对的两侧长边分别固定连接一安装杆件11，每一安装杆件11的靠近两端的部分均安装有一车轮组件2。
如图2、3、4所示，每一车轮组件2包括固定于安装杆件11之下的轴承座20，轴承座20上连接第一销轴21，第一销轴21上环套一段扭簧22，同时，第一销轴21上连接一个车轮座23，车轮座23上连接车轮24，在扭簧22的作用下车轮座23和车轮24自动翻转至靠近载物平台1之下。其中一组车轮组件2中的车轮24采用万向轮。
在扭簧22的作用下，且没有受到其他任何外力作用时，两车轮座23带动车轮24相对旋转至处于同一平面，处于折叠状态；为了驱使两车轮座23带动车轮24各自翻转90度后处于展开状态，在两车轮座23之间设置定位机构3，通过翻转定位机构3带动车轮座23向外翻转撑开，并维持车轮座23和车轮24保持展开状态。
如图5所示，具体的，定位机构3主要由定位套管31、支撑杆32、转轴39构成；其中，转轴39垂直连接于两平行的安装杆件11的中部之间，转轴39可自转；在转轴39的靠近两端的部位分别垂直固定一段支撑杆32，而定位套管31同时垂直固定于两件支撑杆31的端部；随着转轴39的旋转，带动支撑杆32和定位套管31翻转，定位套管31能够处于两件车轮座23之间。
所述定位套管31为中空的圆管，定位套管31的内部具有两段轴向延伸的伸缩杆件33，每一伸缩杆件33的朝外的端部均具有轴向外凸的定位柱34，两段伸缩杆件33的朝内的端部均垂直固定连接一操作手柄件35，两操作手柄件35之间连接一段弹簧36；在定位套管31的中部侧壁具有开口，两操作手柄件35则穿过该开口且外露于定位套管31。
同时，在车轮座23朝着定位机构3的板面具有定位孔，则外露于定位套管31的定位柱34能够对应插入定位孔中。
每一段伸缩杆件33的中部垂直连接一限位柱37，同时，在定位套管31的侧壁与限位柱37对应的部位设置一段长腰孔38，则限位柱37的一端穿过该长 腰孔38且外露于定位套管31；限位柱37配合长腰孔38以限制伸缩杆件33和定位柱34的伸缩幅度。
在弹簧36的作用下，伸缩杆件33外端的定位柱34能够向外伸出且外露于定位套管31的两端；并且，在维持车轮座23和车轮24处于展开状态时，外露的定位柱34对应插入所述车轮座23板件上的定位孔中。
所述载物平台1的下表面且对应所述转轴39和所述支撑杆32的部位均具有内凹的容纳槽12，所述转轴39和支撑杆32能够置于容纳槽12中；所述安装座4的朝内的侧壁具有通孔41，则定位套管31脱离车轮座23后下翻至与安装杆件11齐平时，定位套管31端部的定位柱34对应插入通孔41中。
如图6、7、8、9所示，每一安装杆件11的靠近两端的部位均具有一段空心的方管轴套式的安装座4，在安装座4的开口端套接一伸缩座5；伸缩座5主要由移动框体51、推拉座52、弹簧件6构成，其中，移动框体51设置为一个长方体的框体，移动框体51伸入安装座4的内部且能够沿着安装座4的轴向平移；推拉座52外露于安装座4端部，推拉座52与移动框体51的过渡部位具有外凸的限位凸起，限位凸起能够与安装座4的端部抵触；弹性件6采用一段弹簧。
在实际生产制作时，推拉座52、移动框体51为一体制作，而移动框体51由多条棱构成，平行的棱和棱之间构成了滑槽，有一第二销轴54同时垂直横穿安装座4和移动框体51，第二销轴54横穿于滑槽；同时，在第二销轴54上环套一段短轴套，短轴套处于移动框体51内，而所述弹簧的一端与该短轴套抵触或连接，弹簧的另一端与移动框件51的端部抵触或连接；则在弹簧的作用下，移动框体51能够相对于安装座4进行弹性伸缩平移。
所述载物平台1的同一端，且两件平行的推拉座51之间固定连接一推拉杆55，推拉杆55横穿推拉座51且端部外露。
所述第二销轴54靠近安装座4的开口端，在第二销轴54的外端连接一旋转定位件6，旋转定位件6设置成一段扁的圆柱体，第二销轴54固定连接于旋转定位件6的中心轴线位置；在旋转定位件6的边缘具有多个定位槽61，定位槽 61呈圆周排布；每一定位槽61由旋转定位件6的侧壁内凹形成，定位槽61靠近安装座4且定位槽61靠近安装座4的一端开口；则所述推拉杆55外露的部分对应嵌入旋转定位件6的定位槽61中。
在两个平行的旋转定位件6上固定连接一U型把手2，U型把手2包括两件平行的摇杆21、连接于两件摇杆21的端部之间的横杆22；两摇杆21的端部固定连接于旋转定位件6，且两者的连接部位远离安装座4。
为了提高整体结构的稳定性，在推拉杆55和安装座4之间连接卡合机构8，用于限制推拉杆55的伸缩；具体的，所述卡合机构8主要由一件翻转板81和两件卡合板82构成；其中，翻转板81固定连接于推拉杆55，且翻转板81从推拉杆55的一端延伸至另一端，而两件卡合板82是分别从翻转板81两端朝着外露于安装座4的第二销轴54的端部延伸形成的，卡合板82的靠近第二销轴54的端部具有一个卡槽，卡槽能够卡合在第二销轴54的端部。只要先将卡合机构8解锁，才能够对把手7进行旋转。
载物平台1的两端均连接一U型把手7，其中一U型把手7的两平行的摇杆71之间连接有一载物板73，同时，该把手7的摇杆71和横杆72的连接处具有垂直外凸的脚垫74；当推车变形成为L型行李推车时，载物板73位于下方进行载物，脚垫74和车轮24支撑于地面。
如图10所示，使用完毕后，可将车轮座、车轮、定位机构完全折叠收纳，同时，将把手旋转至载物平台，易于包装、存放和运输。
如图11所示，在图1的U型平板推车的基础上，将推车整体翻转90度，在将位于上方的车轮座、车轮和定位机构折叠，然后将位于上方的把手斜向上翻转100度至120度，形成L型行李推车。
如图12所示，在图1的U型平板推车的基础上，将全部车轮座、车轮、定位机构完全折叠，将两个把手均旋转180度，形成工作台。
文中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类 似的方式替代，但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。

Claims (10)

  1. 一种三合一推车，包括载物平台(1)，载物平台的位置相对的两侧分别连接一安装杆件(11)，每一安装杆件的靠近两端的部分均设置有车轮组件(2)，其特征在于，所述车轮组件包括固定于安装杆件之下的轴承座(20)，轴承座上连接第一销轴(21)，第一销轴上环套一段扭簧(22)，同时，第一销轴上连接车轮座(23)，车轮座上连接车轮(24)，在扭簧的作用下车轮座和车轮自动翻转至靠近载物平台；
    位于同一端的两车轮组件之间设置有用于维持车轮座和车轮处于展开状态的定位机构(3)；
    每一安装杆件的靠近两端的部位均具有一段空心的轴套式的安装座(4)，在安装座的开口端套接一伸缩座(5)，伸缩座包括伸入安装座内部的移动框体(51)、外露于安装座端部的推拉座(52)，在移动框体内设置弹性件(53)；有一第二销轴(54)同时垂直横穿安装座和移动框体，所述弹性件的一端与第二销轴抵触，则所述移动框体能够相对于安装座进行弹性伸缩平移；所述两件平行的推拉座之间固定连接推拉杆(55)，推拉杆横穿推拉座且端部外露；
    所述第二销轴靠近安装座的开口端，在第二销轴的外端连接一旋转定位件(6)，旋转定位件的边缘设置有若干定位槽(61)，定位槽呈圆周排布，则推拉杆的外露的端部能够嵌入旋转定位件的定位槽中；
    位于同一端的两旋转定位件上连接把手(7)，所述把手包括两件平行的摇杆(71)、连接于两件摇杆的端部之间的横杆(72)，两摇杆的端部分别对应连接于旋转定位件。
  2. 根据权利要求1所述的三合一推车，其特征在于，所述定位机构包括位于两件车轮座之间的定位套管(31)、连接与定位套管的支撑杆(32)，支撑杆通过转轴与安装杆件旋转铰接，或者支撑杆通过转轴与载物平台旋转铰接；所述定位套管的两端能够分别与两车轮座抵触。
  3. 根据权利要求2所述的三合一推车，其特征在于，所述定位套管的内部设置有两段伸缩杆件(33)，每一伸缩杆件的朝外的端部均具有轴向外凸的定位柱(34)，两段伸缩杆件的朝内的端部均连接一操作手柄件(35)，两操作手柄件之间连接一段弹簧(36)；所述伸缩杆件外端的定位柱能够外露于定位套管的两端；同时，所述车轮座朝着定位机构的板面具有定位孔，则外露于定位套管的定位柱能够对应插入定位孔中。
  4. 根据权利要求3所述的三合一推车，其特征在于，所述定位套管的中部侧壁具有开口， 所述的操作手柄件穿过开口且外露于定位套管；同时，每一段伸缩杆件的中部垂直连接一限位柱(37)，同时，在定位套管的侧壁与限位柱对应的部位设置一段长腰孔(38)，则限位柱的一端穿过该长腰孔且外露于定位套管。
  5. 根据权利要求3所述的三合一推车，其特征在于，所述推拉杆和安装座之间设置有用于限制推拉杆伸缩的卡合机构(8)；卡合机构包括连接于推拉杆的翻转板(81)，翻转板从推拉杆的一端延延伸至另一端，翻转板的两端朝着外露于安装座的销轴的端部延伸形成卡合板(82)，卡合板上设置有卡槽，卡槽能够卡合在销轴的端部。
  6. 根据权利要求3所述的三合一推车，其特征在于，所述两件平行的安装杆件的中部之间活动连接一段转轴(39)，该转轴与所述定位套管之间连接所述的支撑杆；同时，所述载物平台的下表面且对应所述转轴和所述支撑杆的部位均设置有内凹的容纳槽(12)，所述转轴和支撑杆能够置于容纳槽中；所述安装座的朝内的侧壁具有通孔(41)，则定位套管脱离车轮座后下翻至与安装杆件齐平时，定位套管端部的定位柱插入通孔中。
  7. 根据权利要求1所述的三合一推车，其特征在于，其中一件把手，两平行的摇杆之间连接有载物板(73)，同时，该把手的摇杆和横杆的连接处具有垂直外凸的脚垫(74)。
  8. 根据权利要求1所述的三合一推车，其特征在于，所述弹性件设置为一段弹簧；所述第二销轴上环套一段短轴套，所述弹簧的一端与该短轴套抵触或连接，弹簧的另一端与移动框件的端部抵触或连接。
  9. 根据权利要求1所述的三合一推车，其特征在于，所述旋转定位件设置为圆柱形，销轴垂直固定连接于旋转定位件的中心；所述定位槽由旋转定位件的侧壁内凹形成，定位槽靠近安装座且定位槽靠近安装座的一端开口。
  10. 根据权利要求1所述的三合一推车，其特征在于，所述推拉座与移动框体的过渡部位具有外凸的限位件凸起，限位凸起能够与安装座的端部抵触。
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