Background of the Invention In the prior arts, a number of apparatus, which lift one or both of the vehicle wheels off the ground with the vehicle being at a standstill and move the vehicle in parallel or rotate it by means of an auxiliary wheel so that it can be easily parked in a line parking space, have been invented. For example, Korean utility model laid-open publication No. 1998-038765 discloses"an parking auxiliary apparatus", and its construction is to fix a motor to the lower section of the rear floor panel, install a pinion at its shaft, install a hydraulic means in the concave part formed at the rear end thereof so that it may rotate roller at the perpendicular angle to the piston thereof, simultaneously fix a gear to the center of the roller to get to be engaged with the pinion, and further install a hydraulic motor in the trunk room.

Also, as another example of the prior art, Korean utility model laid-open publication No. 2000-18314 discloses"an parking auxiliary apparatus", wherein a hydraulic cylinder is fixed to an side eccentric position of the rear side of the car, an auxiliary wheel is provided at the lower section thereof in one block, a driving motor is installed in one side of the lower section of the hydraulic cylinder, and thereby, the auxiliary wheel and the driving motor are engaged with each other through a gear.

However, the said conventional inventions have the following problems in common.

First, since a means for lifting and lowering the roller or the auxiliary wheel comprises a hydraulic cylinder, there is a need to install a separate hydraulic pump for

operating it in addition to the auxiliary apparatus for paring a car.

That is to say, in the case of the former invention, since the hydraulic motor (12) is installed inside the trunk room (11), the trunk space gets to be reduced, and as a result, the space for loading freight cannot help being relatively reduced.

Also, in the case of the latter invention, the hydraulic pump (6) is described, and its installation position is not described in detail. However, the hydraulic pump (6) for operating the hydraulic cylinder (100) has to be installed at a certain position.

Thus, in common, conventional inventions require the additional means in addition to the parking auxiliary apparatus. This causes the following problems: The weight of the vehicle is increased to reduce MPG (miles per gallon); some loading space is consumed; the structure is complex due to installation of the hydraulic apparatus; and the installation cost is high.

Second, since installation of the auxiliary apparatus in the vehicle causes the structure of the vehicle to be changed, the car gets to have any problem in the safety thereof.

That is to say, in the former invention, a space for installing the hydraulic apparatus, say, a concave part (5) gets to be required so that it can be installed only in the vehicle forming the concave part (5). Thus, if the hydraulic apparatus is to be installed in the vehicle that has been already delivered to an end user, the body chassis of the vehicle has to be modified for it, and therefore, the safety of the car gets to be hampered.

Also, in the latter invention, the hydraulic pump (6) has to be installed at a given position, and thus, the structural modification of the car is similarly required.

Third, since the roller or the auxiliary wheel, which is an auxiliary means of the wheel, is formed in the round form, it has a problem that the ground contact area is small.

That is to say, in common, the conventional inventions lift the rear axle by the hydraulic pressure and rotate the car body by the motor. In this case, when the rear wheel is off the ground, the rear axle should preferably remain to be in parallel to the ground.

However, in the conventional inventions, since two front wheels at the front of

the vehicle and one auxiliary roller at the rear of the vehicle are in contact with the ground in a small area, the gravity center gets to be very unstable. Specifically, it causes an eccentric load to takes place depending upon a position of loaded goods or a passenger inside the vehicle, and thus, the rear wheel lifted off the ground gets to lose the gravity center so that it falls down. This is a problem. This problem caused by the eccentric load gets to be naturally more dangerous in the slope road.

As mentioned above, the conventional inventions have many problems and as a result, they have failed to be practicable far. Conditions for solving such problems are to enable the parking auxiliary apparatus to be installed without any structural modification or change of the vehicle and the installed parking auxiliary apparatus to be used under any condition beyond the limited conditions, such as the durable life span and exclusion of the eccentric load.

Considering the said problems, the applicant of the present invention has suggested a parking auxiliary apparatus which has solved the said problems and the technology thereof was disclosed in Korean utility model laid-open publication No.

2003-17316. Such technology meets the conditions required for the parking auxiliary apparatus, as described above.

However, since the above invention comprises a link structure in the 4-folding form in which a link bar (20) revolves around a link shaft (21), it caused a problem that the vehicle moves in the right or left side even under the condition that there is no revolution of the track when the vehicle is lifted or lowered.

That is to say, when the vehicle is to be lifted, the link bar (20) revolves around the vehicle to lower the track. From the moment this track gets to be in contact with the ground, the link bar revolves around the track, and as a result, the vehicle gets to move as much as the revolution degree to lift or fall, and thereby, the vehicle is liable to collide with any adjacent object.

Summary of the Invention The present invention is invented to solve the said problems. The first objective of the present invention is to provide a parking auxiliary apparatus which

can be installed without any structural modification or change of the car, and further which can enhance the durability through the mechanism design to operate it in a simple structure.

The second objective of the present invention is to provide a parking auxiliary apparatus which can increase the ground contact area to cope with any eccentric load of the vehicle sufficiently and further lift and lower the vehicle perpendicularly.

The first objective of the present invention is accomplished by having the motor, which is powered from the battery already installed in the vehicle and controlled by a remote control operable at the driver's seat, rotate the roller and lift/lower the link.

Also, the second objective of the present invention is accomplished by installing a plurality of rollers continuously in order to increase the ground contact area and comprising a frame of a six-fold form so that the roller may be lifted or lowered perpendicularly.

Brief Description of the Drawings Fig. 1 is a general perspective view and a partial enlarged view of the parking auxiliary apparatus, partly broken away, according to the 1st example of the present invention.

Fig. 2a and 2b show a working state of the parking auxiliary apparatus according to the 1st example of the present invention.

Fig. 3a and 3b are a plane view, a front view and a working state view of the parking auxiliary apparatus according to the 2nd example of the present invention.

Fig. 4a and 4b show a using state of the parking auxiliary apparatus installed in the vehicle according to the 2nd example of the present invention.

Fig. 5 is a schematic view showing a state that the vehicle is parked by the parking auxiliary apparatus according to the present invention.

Fig. 6a and 6b show a using state of the parking auxiliary apparatus according to the present invention.

Fig. 7 is a partial plane view and a front view of the parking auxiliary

apparatus according to the 3rd example of the present invention.

Description of Preferable Examples Hereinafter, preferable examples of the present invention are described in detail by referring to the accompanying drawings.

Fig. 1 is a general perspective view and a partial enlarged view of the parking auxiliary apparatus, partly broken away, according to the 1st example of the present invention. To help one understand the construction thereof, a part of the supporting plate (21) is broken away and enlarged to make a partial enlarged view thereof.

The supporting means (A) of the present invention comprises the fixed frame (10), the link frame (20) and the roller frame (30) in the form of a six-folding link.

Particularly, as shown in Fig. 1, the said fixed frame (10) has an approximate H-shape in plane. One pair of link frames (20) (20') are, respectively, linked with both ends of the fixed frame (10) in the rotatable form. And, the other end of each link frame (20) (20') is fixed to the supporting plate (21) having two shafts, and the lower link frame is installed symmetrically to the upper link frame. The front end of the lower link frame is linked with the roller frame (30) in the rotatable form, and thereby, a 6- folding link is formed.

Hereinafter, for the sake of convenience of explanation, distinction of reference numbers are made to be omitted by introducing concepts of"upper"and "lower","right"and"left"and"front"and"rear"on the basis of the figures.

As shown in the enlarged view, the joint part between the right and left upper link frames (20) (21') and the right and left lower link frames (20) (21') which are respectively linked with two shafts inside the supporting plates (21) (21') has the frame gear (23) through which they are engaged with each other.

When the upper or the lower link frame causes any change of angle to make it opened or narrowed, the frame gear (23) maintains a uniform ratio to keep the fixed frame (10) to be parallel to the roller frame (30).

Also, as another supporting device for preventing the front/rear fixed frame (10) and the roller frame (30) of the supporting means (A) from being twisted, the link

bar (12) (12') is constructible.

The left link bar (12) is fixed to a given position of the left upper link frame (20) in the rotatable form so that it is fixed to one side of the hinge plate (11) positioned at the center of the fixed frame (10) in the rotatable form. And the right link bar (12') is fixed to a given position of the right upper link frame (20') so that it is fixed to the other side of the hinge plate (11) in the rotatable form.

Meanwhile, the means (B) for lifting and lowering the supporting means comprises the 1st geared motor (40) fixed to the left link frame (20), the spiral shaft (41) linked with the 1st geared motor in series, and the cylinder (42) spirally engaged with the spiral shaft (41), which is fixed to the right link frame (20'). The said Ist geared motor (40) is electrically connected with, and driven by the battery power of the vehicle, together with the 2nd geared motor (50) as. mentioned below. Since the construction of such electrical circuit is satisfied with a typical means, the detailed description thereof is omitted.

The moving means (C) for rotating the roller (60) comprises the 2nd geared motor (50) fixed to the roller frame (30), the roller shaft (51) linked with the 2nd geared motor in series and passing through one pair of roller frames, and the roller gear (52) and the roller (60) secured to the roller shaft (51).

The said roller (60) may be installed, as many as at least two or more, depending on the size or weight of the vehicle. The roller is preferably manufactured by using rubber material, and on the surface thereof, a groove for skid-proof (not shown) may be formed, like on the surface of the snow tire for the vehicle.

Also, in order to transmit the driving power of the 2nd geared motor (50) to two or more rollers (60) as installed concurrently, those rollers may be linked by winding the chain (53) around the roller gear (52) installed in the side of the roller. If three rollers (60) are installed as shown in the figure, those rollers are linked by having the chain (53) engaged with the front and rear roller gears of the central roller and roller gears (52) positioned in the right and left sides thereof, and even in case 5 rollers are installed depending upon the weight of the vehicle, the driving power of the motor can be transmitted to all rollers in the manner like this.

The said means (B) for lifting and lowering the supporting means and the said

moving means (C) are designed so that they may be controlled and operated by a remote control installed in the driver's seat of the vehicle. The power for driving them is made to be supplied from the battery installed in the vehicle. As a preferable example, the switch of the means for lifting and lowering the supporting means and the switch for the moving means are separately provided.

That is to say, the up/down switch for driving the means for lifting and lowering the supporting means and the right/left switch for driving the moving means are respectively provided.

Fig. 2a and 2b show a working state of the parking auxiliary apparatus according to the example of the present invention, and each working state of the means for supporting means and the moving means is more embodied by referring to Fig. 2a and 2b.

The vertical distance of the supporting means (A) is increased or decreased by the means (B) for lifting and lowering the supporting means.

That is to say, if the spiral shaft (41) is rotated by the driving power of the 1st geared motor (40), the spiral shaft (41) gets to go into or out of the cylinder (42).

Accordingly, the space between the left link frame (20), a fixed part of the 1st geared motor and the right link frame (20') positioned at the other end gets to be narrow or wide, and each link frame gets to be rotated around the fixed shaft of the roller frame (30).

Since this operation is made symmetrically at the right and left sides, the space between the fixed frame (10) and the roller frame (30) gets to be wide or narrow with them remaining in parallel.

Also, in the figure, the 1st geared motor (40) and the front end of the cylinder (42) for the means (B) for lifting and lowering the supporting means are respectively installed in the lower link frame, but they may be installed in the upper link frame, and not only the spiral engagement construction through the spiral line but also a hydraulic cylinder may be used.

In case a hydraulic cylinder is substituted for the spiral shaft (41) and cylinder (42) in the means (B) for lifting and lowering the supporting means, it has advantages that the noise and vibration resulting from the motor gets to be reduced, and that when

a car is lifted, the supporting force gets to be increased so that it is more safe, but this gets to be a factor to increase the price. Therefore, either of them will have to be appropriately selected depending upon the quality of the parking auxiliary apparatus.

Meanwhile, when the roller of the supporting means (A) gets to be in contact with the ground, as shown in Fig. 4b mentioned below, the right and left movement of the vehicle is made by the moving means (C).

That is to say, the roller shaft (51) linked serially with the 2nd geared motor is rotated by the driving power of the 2nd geared motor (50), and the rotatory force of the roller shaft (51) drives another roller (51) through the roller gear (52), and thereby, a plurality of rollers (50) get to be rotated at the same time, and the medium for such rotation is the chain (53).

However, the moving means (C) may use the gear as a medium, like the case with the 3rd example described below.

Fig. 3a and 3b are a plane view, a front view and a working state view of the parking auxiliary apparatus according to the 2nd example of the present invention.

Particularly, they represent an example changing the supporting means (A) in the construction of the said 1st example. Since the means for lifting and lowering the supporting means and the moving means are the same as each means of the said 1 st example in action thereof, the detailed figures thereof are omitted.

If Fig. 3 is referred to, it can be known that when the means for lifting and lowering the supporting means has completed the lifting operation, the left/right link frames (20) (20'), which are linked with the fixed frame (10) and the roller frame (30) in the rotatable form, forms almost a straight line so that the space between the roller (60) and the ground is sufficiently secured.

For this operation, each one end of the auxiliary links (25) (25'), which are provided vertically symmetrically in a given position of the upper and lower link frames (20) (20'), is fixed in the roatatable form, and the other end of each auxiliary link (25) (25') is fixed to each auxiliary supporting plate (26) (26') forming two shafts in the vertical direction. The width of these auxiliary links and auxiliary supporting plates is properly designed so that they may get to be inserted into the link frame (20) (20') when the means for lifting and lowering the supporting means has

completed the lifting operation, as shown in Fig. 3a.

Also, as described in the first example, a link gear may be formed inside the said auxiliary supporting plates and supporting plates, that is to say, in the joint part of the upper/lower auxiliary links and the upper/lower link frames. The means (B) for lifting and lowering the supporting means may be spirally engaged with the spiral shaft and supporting plates (21) (21') (26) (26'), passing through the right and left supporting plates (21) (21') and auxiliary supporting plates (26) (26').

In order for the parking auxiliary apparatus to be converted from the state as shown in Fig. 3a to the state as shown in Fig. 3b according to the construction of the 2nd example, the inter-axial space (b) of the auxiliary supporting plates (26) must be larger than the inter-axial space (c) of the supporting plates (21), as shown in Fig. 3a.

It should be noted that when the two inter-axial spaces are the same or the interval space of"b"is smaller than that of"c", the auxiliary link gets to interfere with rotation of the link frame.

Fig. 4a and 4b show a using state of the parking auxiliary apparatus installed in the vehicle according to the present invention. Several bracket fixing parts (13) as shown in Fig. 3a are formed on the fixed frame (10). This bracket fixing part (13) is fixed to the bracket (92) properly fixed and installed according to the bottom shape of the vehicle. The said bracket (92) can be appropriately designed according the vehicle type so that it may be installed at any place causing any fatal defect in the structure and safety of the vehicle, such as the body frame of the vehicle, the bedded position (91) for a spare tire, and the like.

If the parking auxiliary apparatus is fixed to the vehicle as above, the roller frame (30) gets to be in a position to lift or lower the vehicle by extending from or retracting to the vehicle. And if only the bolt installed in the fixed bracket (13) is removed, the parking auxiliary apparatus can be simply removed.

When the vehicle is being run with the parking auxiliary apparatus installed therein, the roller frame (30) is in a retracted position up to the fixed frame (10), as shown in Fig. 4a so that a given interval between it and the ground is maintained. If it is necessary to park the vehicle after the vehicle stops, as shown in Fig. 5, the roller frame (30) is lowered by using the means (B) for lifting and lowering the supporting

means (B), and thereby, the vehicle wheel (90) is lifted off the ground, as shown in Fig.

4b. Then, the roller (60) is driven by operating the moving means (C), and thereby, the vehicle is moved in the desired direction. Thereby, it helps park a car at a narrow space without driving the vehicle wheel (90), as shown in Fig. 5.

The present invention is also useful to replacement of the rear wheel (90) of the vehicle. When the rear wheel (90) of the vehicle is worn away or punctured, usually, the vehicle has to be lifted by a mechanical device, such as a jack for vehicle.

However, if the parking auxiliary apparatus according to the present invention is installed, there is no need to exert such efforts.

That is to say, in case the rear shaft wheel (90) is to be replaced, if the roller (60) is let to go down by operating the 1st geared motor (40), the vehicle gets to be lifted off the ground and thus, it is possible to replace the wheel (90) without using the jack separately. Particularly, this parking auxiliary apparatus is useful to a woman or a user who has never used the jack.

Fig. 6a and 6b show a using state of the parking auxiliary apparatus according to one example of the present invention. Fig. 6a shows the ground contact area of the roller (60). Fig. 6b shows an extreme situation in which the roller is moving right and left on a slope road.

As described above, in the conventional inventions, the ground contact area is so small that the vehicle gets to be very unstable. So, if the load of the vehicle gets to be eccentric, it is impossible to use the parking auxiliary apparatus or the parking auxiliary apparatus is liable to be damaged.

However, according to the present invention, the ground contact area of the roller (60) supporting one side of the vehicle is enlarged, as shown in Fig. 6a.

Therefore, although any eccentric load takes place in the right or left side of the vehicle, it is possible that the parking auxiliary apparatus gets over the eccentric load and moves rotationally.

As the ground contact area is enlarged as above described, even though an eccentric load takes place due to a slope road or anything loaded lopsidedly, as shown in Fig. 6b, the rear wheel shaft keeps to be parallel to the ground with either wheel not being in contact with the ground.

Fig. 7 is a partial plane view and a front view of the parking auxiliary apparatus according to the 3rd example of the present invention. The 3rd example shows another embodiment of the moving means (C). This embodiment can be combined with each construction of the 1 st example and the 2nd example.

If Fig. 7 is referred to, the roller (80) is fixed to both ends of the roller shaft (73) passing through one pair of roller frame (30). In the center of the roller shaft (73), the worm gear (72) is connected with the 2nd geared motor (70).

As described above, the roller may be installed as many as two or more, depending upon the weight of the vehicle in which the parking auxiliary apparatus is to be installed. The number of worm gears (72) corresponds to the number of rollers (80).

In such construction, the process of transmitting the power is described as follows. The driving force of the 2nd geared motor (70) is transmitted to the driving shaft of the motor (71). This driving force is transmitted to the roller shafts (73) from the worm gears (72) installed continuously in the motor driving shaft (71). Thereby, a plural number of rollers (80) get to be rotated at the same time.

Also, though not shown in the figure, the method for driving by means of the gear is not limited only to the example as shown in Fig. 7, and a bevel gear or a helical gear may be used in place of the worm gear. In addition, any mechanical device that can transmit the driving force of the 2nd geared motor to the roller shaft (73) at a right angle thereto may be adopted, and in this case, structural stability, durability, procurability and manufacturability of the material, material cost and the like should be naturally considered together.

If the parking auxiliary apparatus is constructed like the example as shown in Fig. 7, though the number of rollers (60) is increased, it is possible to install the gear device as many as the increased number of rollers. Also, if a plural number of rollers are driven through the gear devices, the driving of rollers is smooth and it is possible to control it more accurately, even if the load of the vehicle is increased or the ground condition is not even.

Industrial Applicability As mentioned above, since the parking auxiliary apparatus according to the present invention does not include any control device like a hydraulic pump, it can be installed in the car without any structural modification thereof, and further, the manufacturing cost thereof is so much lowered as to be supplied to consumers at a low price. Moreover, since the weight of the parking auxiliary apparatus is not great, any deterioration of MPG can be prevented.

In addition, since the ground contact area of this partaking auxiliary apparatus to the right and left side of the vehicle is enlarged, it has solved the problem of any eccentric load due to replacement of the tire, anything loaded lopsidedly, the position of the passenger or the like, and thus, irrespective of any extreme condition, such as a slope road, it enables the vehicle to be kept in parallel with the ground beyond the eccentric load. Furthermore, since it enables the vehicle to be lifted or lowered vertically, it is a very excellent invention to enable the parking auxiliary apparatus, which has never been practically used so far, to be used universally.