CN86206714U - Universal hand cart for tourists - Google Patents

Abstract

The utility model relates to a living appliance with a new structure designed by the adoption of the new material to satisfy the multiple uses for the tourist in the modern life capable of being combined into the article loading cart, the article carrying rack, the cart capable of climbing the stairs, the children cart, the baby walker, the small chair, the small couch, the picture taking bracket and the simple tent capable of loading into the travelling bag after being disassembled. The utility model has the advantages of convenient assemblage, low cost and no screw fastening. All the parts of the cart are plastic except for a minority of springs. A load carrying member has strength calculation and well design to ensure the exact fit and the reliable use. The utility model adopts the injection molding with high productivity; the pulling force is only 54.9% of the gravity when climbing the stairs.

Description

Universal hand cart for tourists

The tourism general purpose car is the multiduty overall plastic combination vehicle of people's design-calculated for travelling and going out.Because this car is all-plastic structure, member can be made various complicated shapes satisfying the needs of multiple combination for this reason, thereby few member can be combined into nine kinds of functions.The time spent can all not dismantled and be assembled very small size and pack in the bag.Disassembly and assembly are convenient, do not have tightening screw, and its combination one of makes the many usefulness of car, meets the multi-functional design philosophy of current daily necessities one thing.

Loading dolly in the market is the metal plating structure, and purposes is single, and volume after folding is not bigger the time spent, carries inconvenience.Though all have severally both at home and abroad, what have can be as little chair usefulness, and basic difference is little, and price is more expensive.

After this general purpose car mould is made operation, the capacity rating height, cost is low, can save great deal of steel again.And in light weight, easy to carry, of many uses, real is the tourism good merchantable brand.

One, structure

The structure of this car (as Figure 17), the vertical rod of two three sections suits 1., pulling out can be by the pin self-orientation.2. two side levers are packed into by the vertical rod bottom, and 5. wheel shaft that then will be from all directions inserts vertical rod 1. in the hole, all directions of bottom.Wheel is loaded onto at two ends, axle is blocked up 10. to push in the wheel shaft endoporus 5. again, and fixes with the groove in the hole, to block wheel.Two inboard shaft bars 3., 6. front end inserts cross bar, colludes E(with the elasticity at cross bar two ends and injects with mould) fixing.And 8. be installed in side lever with two fix shafts and 2. go up.Again 7. foot lever is inserted in the side lever bipod oblong aperture 2., with the locating dowel pin of both sides location positioning on demand.4. handle rod is inserted with two ends, and colludes F(with elasticity and inject with mould) be fixed in vertical rod top 1..Two square frame A on it are for the hook usefulness that tangles bundle article rope, and during the combination tent, 4. the two ends oblique cutting is in the elongated slot D of vertical rod bottom conversely for handle rod, and 2. two square frame A use for side lever is installed.The three-wheel combination as the figure of stair climbing vehicle, wherein the two-wheeled front end inserts in another dovetail furrow of taking turns, and makes the axis hole alignment, is contained in wheel shaft and 5. goes up, and 10. blocks with axle is stifled again.9. the support of two-section suit is inserted in handle rod and 4. goes up, and loads onto headrest B and uses for chaise longue.Loading onto the support C that takes pictures uses for the support of taking pictures.Because structure is complicated, can only make this brief overview, the visible design paper of details.

All parts of this car all are made of plastics, and adopt injection mo(u)lding, can concentrate in three molds.Consider to be convenient to each, adopt the rod member in rectangle hollow cross section to the distribution of intensity and the convenience of mould-manufacturing.Accomplish satisfying under the prerequisite of requirement of strength as far as possible, make the component volume minimum, weight is the lightest.

This car can be combined to nine kinds of functions, and ten kinds of existing divisions of structure are as follows:

1, dismounting set assembling: dismantle the back as Fig. 1 and gather in the purpose made packaging bag of packing into, oad is 10 * 10 * 34 centimetres.Packaging bag has one on belt, can directly carry, in any travelling bag of also can packing into.

2, the little vehicle of loading: after 1. two vertical rods pulled out as Fig. 2, pin ejected fixing automatically.The side lever that puts both sides more 2. with inboard shaft bar 3..Load onto handle rod and 4. 5. reach wheel, 7. 6. cross bar loaded onto with foot lever got final product again with wheel shaft.Fasten and to use respectively having on the fabric sleeve on vertical rod and the thing frame.

3, article back-holding type: as Fig. 3 on the road of injustice or climb the mountain available it article are shouldered, walking is convenient.With first section withdrawal of vertical rod, more 3. inboard shaft bar is lifted during use, 8. prop up with fix shaft.Utilize the belt of packaging bag, in the iron hoop in the middle of the vertical rod fabric, two lower ends are hung on the wheel shaft, and fastening with hasp is that available both shoulders are shouldered again.

4, stair climbing vehicle: be mostly about the stair as the tube at Fig. 4 station.Two-wheeled respectively is changed to the three-wheel fabricate block, then walks the walking of level road and stair activity freely.This design can be climbed and whenever be ascended a height is stair below 20 centimetres, and the step width is not limit, and it also can use as building resident family carrying heavy goods.

5, children's vehicle: as Fig. 5 2. the both sides side lever is risen, and in vertical rod 1., locate, 3. inboard shaft bar is forwarded to vertical rod place, and block vertical rod, refill front-wheel.Children can be sitting on the fabric pad between side lever, and pin can be stepped at foot lever and 7. go up, and the adult just can push away away, for children ride instead of walk.

6, baby walker type: the both sides side lever is suitably risen and corresponding location as Fig. 6.Insert a wheel in foot lever, vertical rod is slightly leaned forward, and with first section withdrawal of vertical rod, just becomes baby walker.

7, little chair-type: as Fig. 7 2. the both sides side lever is risen, 3. inboard shaft bar forwards the back to, 8. is fixed in the vertical rod with fix shaft, and 7. foot lever is pulled out a ground, first section withdrawal of vertical rod, becomes little chair, can be for the usefulness of respite.

8, little deck chair type: by little chair-type foot lever is regained a ground as Fig. 8, vertical rod is pulled out for first section, and adorn a fabric pad, again 9. support is inserted on the handle rod and (support is not pulled out for second section), and load onto headrest, and promptly become little chaise longue, use for viewing and admiring in the tourist spot to have a rest.

9, the support rack type of taking pictures: as Fig. 9 three sections vertical rods are pulled out, two side levers suitably rise a location and a ground, make vertical rod lean forward 6 °, with support 9. two-section pull out, be inserted on the handle rod, and insert the camera carrier base 10..Twist the bottom knurled head of dribbling screw rod (11) with hand, screw rod is screwed in the camera, and pins, handle camera with handgrip (13) during use and can swing in any direction with nut (12), lock the garden ball with fixed camera with handgrip (14) after finding a view, promptly capable of taking pictures.The support height can adjust to be applicable to dissimilar cameras.

10, simple and easy tent type: two vertical rods are pulled out for three sections as Figure 10, a handle rod of touching the pillow oblique cutting 4. at 45 is gone into the big end of two vertical rods, small end props up ground, as the tent side arm, 5. two wheels arms and wheel shafts are plugged together with joint is an arm, inboard shaft bar 3. three direct connections is an arm, reusable connector has joined middle frame as tent with two arms, with support 9. two-section make the tent after-frame with pulling out, in the middle of join with rope, and it is rope ends is in the tree fastening or use stone, 8. plug pin plugs two fix shafts respectively with tension again with on the 2. anti-square frame A that is inserted in handle rod of two side levers, and with joint, cover again plain cotton fabric around pushing down tent, the inside two people that can sleep that are used for encamping, the rest of can changing one's clothes in swimming the inside, seabeach, two people can be sat for sunshade in the outside.

Two, force analysis

In nine kinds of array configurations, eight kinds stressed all fairly simple, can examine strength of material by simple static(al) load and get final product, and has only the stair climbing vehicle stressed complicated, the relation of the analysis pulling force of summary.

Wheel is a version of considering this car, requires lightly flexibly, and therefore adopting three diameters is the wheel of 100mm, makes up sizes such as Figure 11 by 120 °.

This car is when going upstairs, and stressed the variation is now by four kinds of state computation stressing conditions.

1, on two-wheeled coexisted a ladder, front-wheel a withstood ladder, and as Figure 12, at this moment the weight G of car is born P=0 when stopping by ladder

When firmly upwards drawing, wheel body will be with wheel a garden heart O ₁Be the center, the upwards swing of wheel arm, at this moment weight G is decomposed into G along the wheel arm ₁G ₂Because G and G ₁G ₂Anchor clamps 60 ° of therefore G=G each other ₁=G ₂G ₁Acting on ladder way by wheel a offsets.

Pulling force P is to wheel arm OO ₁Angle, because of ladder is generally 30 °, the power thrusts of hand is also got 30 ° to ladder, so P is to OO ₁It is 90 °.

Press moment balance formula 120 * P=G ₂On continuing, draw * 120cos30 ° of P=0.8660, then the component G of G ₂Dwindle rapidly, so P power is more and more littler, works as OO ₁₁P=0 during ground.

2, when P upwards drew again, P was decomposed into P ₁P ₂(as Figure 13)

P ₁＝Pcos30°＝0.866P

P ₂＝Pcos60°＝0.5P

Antagonistic force P ₂Act on O and promote wheel a, make wheel body around wheel b garden heart O ₂Rotate, rise along terraced wall simultaneously, the moment balance formula is:

P ₂（120＋60）＝（G－P ₁）120cos30°

With P substitution 179.99P=103.9G ∴ P=0.57G

Since the height difference of ladder, when b wheel contact ladder way, a wheel arm OO ₁Not necessarily just in time vertical, numerical value that so only can affects P.

3, draw on continuing, a wheel is along the terraced wall then antagonistic force P that swashes ₂Move the arm of force on the point of action and dwindle, the arm of force of G increases, and is 120 when equal b wheel brachium to maxim.(as Figure 14)

Moment-equilibrium equation is P ₂* 120cos30 °=(G-P ₁) * 120 are with P substitution 155.88P=120G ∴ P=0.77G

4, draw P in the continuation ₂Move on point of action continues, be contracted to 50 to the tread arm of force at last, at this moment (G-P ₁) will be decomposed into two power G ₁Acting on b takes turns to tread counteracting, G ₃Downward along a wheel arm.(as Figure 15)

θ＝Sin 50/207.8 ＝13°55′

a＝30°－θ＝16°5′

β＝90°－a＝73°55′

γ＝60°

(G-P ₁)/(Sinγ) ＝ (G ₂)/(Sinβ) ∴G ₂＝1.1（G－P ₁）

Moment-equilibrium equation is 50P ₂=G ₂* 120cos30 °=1.1(G-P ₁) * 103.9 are with P substitution 123.97P=114.29G

P＝0.92G

Draw a wheel center to surpass tread in the continuation, the counter-force direction is changed into to a wheel center, increases the arm of force rapidly P power is reduced until to 0.

Comprehensive premises stressing conditions can draw the curve (only draw 120 °) of pulling force P in wheel, and average by the used pulling force of this curve calculation as Figure 16 is 54.9% of gravity only.

Because stair size and people's firmly situation is not quite similar, the dynamic stress that carries out detailed complexity calculates and also there is no need, and is general from visible this car labour-saving of this simple qualitative calculating.

Three, Intensity Design and selection

This product is one to be made up of the plastic member that needs load, therefore extremely important to the selection of strength of material.But because it is an instrument that is used by manpower and the structure of underwriter's body weight, load is heavy.Therefore the intensity of common engineering plastics can be competent at fully.

For the design-calculated small volume and less weight and will satisfy the combination of numerous functions, thus complex structure, and therefore special load-carrying member is selected high-intensity material as far as possible, with the reliability that guarantees to use.In order to satisfy complicated combination and to improve the load state, must improve the quality of fit of member, thereby will select the stable material of shrinkage percentage small size.Intend selecting for use intensity at 500kg/cm for this reason ²Above shrinkage percentage is at the material below 1%, and other stressed little parts can adopt general material.

Strength design of components is based on the vertical rod of two three sections suits.Structure such as Figure 17, these three sections loop bars are topmost load bars in the structure, bear pulling force and flexural load, the weak link of tension is a pin, and minimum diameter is 6mm, by 100 kilograms of maximum carryings, 25 kilograms of each loads of 4 pins are arranged, press the hole wall pressurized and calculate, the area of conter of hole wall is 0.12cm ², stress is 208.3kg/cm ²Cut calculating by pin, the pin sectional area is 0.28cm ², friction stress is 89.3kg/cm ², promptly calculating by maximum shear stress theory also has enough intensity.

Take following design in order to improve the ability of bearing flexural load:

1, by the direction of bearing flexural load, be designed to the rectangle hollow cross section, for the major axis wall thickness adopts 3mm, interior cover is 4mm on the I-I direction of load.The vertical direction wall thickness is 2mm.

2, for guaranteeing the precision-fit of loop bar, increase area of contact, to improve the load state, inner sleeve fitting surface minor face makes 1 ° gradient, is convenient to delivery, thereby and has eliminated the influence of pattern taper to cooperating.

3, increase wide 5mm, the stiffened edge of thick 3mm around the upper end outer rim of every bar.

4, outer tube makes strength reduction owing on the wall two knock holees are arranged, and adds two reinforced ribs to improve bending strength on the minor face outside for this reason.

Because member shape and stressing conditions are all very complicated, therefore be difficult to tally with the actual situation fully for calculation of strength, only go into operation at mould, goods are examined after making, gain in strength for the weak link mould of making amendment then, or adopting reinforced plastics to meet the demands to improve intensity, these all are easy to accomplish.

Claims (4)

1, a kind of tourism general purpose car that is applicable to tourism.It is characterized in that, overall plastic structure, multiple combination, no screw tightens up, convenient disassembly.

2, by the described tourism general purpose car of claim 1, it is characterized in that utilizing limited plastic parts, adopt the connection of suit and different modes, and the locking mode that adopts the elasticity of plastics locking plate in the roman member, can realize the combination of various ways, to satisfy the purposes of nine kinds of functions.

3,, it is characterized in that all to dismantle in the bag that collection is loaded on 10 * 10 * 34 centimetres by the described tourism general purpose car of claim 1.

By the described tourism general purpose car of claim 1, it is characterized in that except that the minority spring that 4, all part is by injection molding, adopt hollow thin-wall component, the given shape of member and fit system guarantee to satisfy the requirement of multiple function combination, and all part can be made with three molds.

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