KR0130937B1 - Muti-functional - Google Patents

Abstract

The invention is general-purpose cart for persons to go up and down stairs unlaboriously, safely, and easily with dynamic force. The device comprises a body frame (1); a cargo bay (10), installed on the body frame (1), capable of upraising; a wheel drive shaft (11) supporting the body frame (1) rotatable; two sets of three greased wheels (12,12 ) mounted at equidistances on the same circle and supported for the revolution and rotation of greased wheels (12,12 ) around the wheel drive shaft (11); means for driving wheels with a motor (23) driving the wheel drive shaft (11) for the revolution of greased wheels (12,12 ); means for raising up the loading cart (10); a gear group driven by a motor (23) and turning the wheel driving shaft (11); a capstan shaft (36) drived and rotated in connection to said gear group; a winding reel (39,39 ) combined with a capstan shaft (36); a guiding roller (15,15') and the loading cart (10), which are installed on the topside, having one end of a body; a wire (14,14') that the other end of a body wound on the winding reel (39,39') through the guiding roller. The invention can be also applied to a baby carriage or a cart for transferring a patient in a hospital.

Description

Multifunctional Electric Cart

1 is a perspective view showing the appearance of a multifunctional electric cart according to an embodiment of the present invention.

2 is a perspective view showing a drive unit of the multifunctional electric cart according to an embodiment of the present invention.

3 is a partially cutaway plan view illustrating the operation of the driving unit shown in FIG.

Figure 4 is a side view showing a state of transporting logistics in the flat with a multi-functional electric cart according to an embodiment of the present invention.

Figure 5 is a side view showing a state of climbing the stairs with a multi-functional electric cart according to an embodiment of the present invention.

6 is a side view showing a state of use of the multi-functional electric trolley according to an embodiment of the present invention in a raised state of the mounting table.

7 is a partial cut plan view showing an example of the use of the auxiliary legs when lifting the load carrier in the multi-functional electric cart according to an embodiment of the present invention.

8 is a partial front view illustrating the operation of lifting and lowering the loading table of the multifunctional electric cart according to the embodiment of the present invention.

9 is a partial cutaway front view showing one embodiment of a means for preventing the natural descent of the cargo loading in the multi-functional electric cart according to an embodiment of the present invention.

＊ Explanation of symbols on main parts of drawing

1: body frame 10: loading table

11: wheel drive 12, 12 ': planetary wheels

12a: auxiliary wheels 14, 14 ': wire

18, 18 ': secondary leg 19, 19': ratchet

20: band 23: motor

25: spline shaft 26: broach

27,27: gear part 28: switching plate

29: rack 30: pinion

31,31 ': Electric gear 32, 32': Drive gear

36: capstan sft 39, 39 ': winding reel

47, 47 ': latch 50: rotating plate

The present invention relates to a multi-functional electric cart that can load up and down flat floors as well as steps, and in particular, it is easy and safe to move up and down a procedure, and also easy to load and displace cargo. The present invention relates to a multifunctional electric cart that uses power.

In transporting packages, wheeled vehicles have been designed for quite some time to avoid primitive methods, to take less effort, and to transport relatively large quantities. However, when crossing overpasses, underpasses, or climbing buildings that do not have elevator facilities such as elevators, stairs should be used. Conventional wheeled vehicles are easy to move on flat or unsuitable for climbing stairs. Therefore, in the staircase, not only the cargo to be transported but also the wheeled vehicle must be carried together in a primitive way. This is very hard and cumbersome.

According to Utility Model Publication Nos. 91-4554 and 91-5206, a transport mechanism for loading cargo and climbing stairs is known. The former is designed so that the two wheels can be placed back and forth, but relatively swing up and down, and when the rear wheels touch the ground, the front wheels can be lifted to climb the upper stairs with the front wheels. And the latter is designed to climb stairs by arranging a plurality of wheels on the same circumference around one wheel drive shaft at equal intervals and allowing the rotor to rotate and rotate about its support shaft so that it is sequentially grounded on each floor of the stairs. . On the other hand, there is an example in which a track wheel is attached to a baby carriage as shown in Utility Model Publication No. 88-2589 and 92-5319 as a similar device.

These conventional vehicles are towed only by manpower without using power. Therefore, when climbing stairs, the vehicle must be pulled up with a force exceeding the total load including the cargo and the vehicle. Thus, it is still difficult to climb stairs with relatively bulky or heavy packages. Moreover, it is difficult to use great force on the stairs because the towing person usually cannot take a comfortable position. For this reason, it was sometimes caused by an accident, such as missing transport equipment or dropping cargo.

On the other hand, in the conventional transport mechanism, the loading table on which the load is placed is fixed to the main frame, so it is not easy to load the cargo from the position higher than the loading frame, for example, to load the cargo from the truck or transfer to the truck.

In order to solve the problems in the prior art as described above, an object of the present invention is to provide a multi-functional electric cart that can be easily up and down the stairs easily and safely by using power.

Another object of the present invention is also to provide an improved multifunctional cart that facilitates loading and dropping cargo from high places while also making it easy to climb and descend stairs using power.

In order to achieve the above object, the present invention is: a main body frame (1) having a handle and: a mounting table (10) installed on the main body to move up and down: a wheel drive shaft rotatably supported on the main body frame (1) (11) and: two sets of three planetary wheels (12, 12 ') arranged at equal intervals around the wheel drive shaft (11) and supported to rotate and revolve around the wheel drive shaft (11); : A wheel drive means comprising a motor 23 for driving the wheel drive shaft 11 so that the planetary wheel idle, and: A multi-functional electric cart comprising a lift drive means for lifting the mounting table 10, The elevating driving means is driven by the motor 23 and the gear group for rotating the wheel drive shaft 11 and: a capstan shaft 36, which is connected to the gear group and driven to rotate, coupled to the capstan shaft 36 Winding reels 39, 39 'and: the main body Guide rollers 15 and 15 'installed with one end of the wire 14 and 14' having one end connected to the mounting table 10 and the other end wound on the winding reel 39 and 39 'via the guide roller. It is characterized in that the cargo loaded on the mounting table 10 can be loaded and transferred at a desired height.

In addition, the present invention: a main frame (1) having a handle; A mounting table 10 for loading cargo supported on the main frame 1 in a lifting and moving manner; a wheel drive shaft 11 rotatably supported on the main frame 1; and around the wheel drive shaft 11 A plurality of planetary wheels 12 and 12 'disposed at equal intervals on the same circumference and supported to rotate and revolve around the wheel drive shaft 11: first driving means for driving the wheel drive shaft 11; And second driving means for elevating the mounting table 10; a motor 23 for driving the first and second driving means; In the multi-function electric trolley having power switching means for selecting and switching the power of the moto 23 as its first driving means and the second driving means, the power switching means is a spline driven by the motor 23. Shaft 25 and: Broach 26 coupled to the spline shaft 25 and formed with two gear portions 27 and 27 'at both ends for driving the first driving means and the second driving means; ; A switching plate 28 coupled to the broach 26 so that the broach 26 can be rotated; It characterized in that it comprises a moving member for moving the switching plate 28 in the spline shaft direction.

Such a multi-functional electric cart according to the present invention, it is possible to transport cargo on the flat state without using power, it is possible to move up and down effortlessly and safely by operating the motor as needed in the stairs. In addition, by using the power to raise the loading table to the desired height, it is easy to load and transfer the cargo at the desired height.

That is, the present invention is very easy to transport, regardless of the level and stairs in transporting the package, in particular can safely climb up and down the stairs, as well as the loading and transfer of cargo as well as easy, in other words, as a multifunctional To provide the most reasonable multifunctional electric cart.

When described in detail with reference to the accompanying drawings an embodiment of the present invention.

1 shows the appearance of a multifunctional electric cart according to a preferred embodiment of the present invention. In this figure, the main frame 1 includes the support parts 2 and 2 형성 forming the left and right sides, the auxiliary support parts 3 and 3 은 extending in parallel to the inside thereof, and the upper and lower ends of the support parts 2 and 2 ＇. It consists of a connecting portion (4, 4 ＇) connecting across, and a support (5, 5＇) supporting the rear of the support (2, 2 ＇).

At the upper end of the supporting parts 2, 2 ＇of the main frame 1, handle bars 8, 8＇, each having two handles 6, 6 ＇; 7, 7＇, are inserted. The user may conveniently grasp the upper handle (6, 6 ＇) or the lower handle (7, 7＇) according to his physical condition or the environment of the moving place. Two pairs of handles 6, 6 ＇and 7, 7＇ are formed integrally with each handle bar 8, 8 ＇, and each pair may have a different bar body. The handle bars 8 and 8 ＇can be drawn out longer for both sides of the support frame 2 and 2＇ of the body frame 1 for the taller person, and the body frame It is firmly fixed to the supporting parts 2, 2 ＇of 1).

The front surface of the main frame 1 is provided with a mounting table 10 for loading cargo, and the wheel drive shaft 11 is provided between the supporting portions 5, 5 ＇of the main frame 1, and the wheel drive shaft At both ends of (11), three planetary wheels 12 and 12 s disposed at intervals of 120 degrees are provided, respectively.

First, the bearing is supported so that the wheel drive shaft (11) 읕 can be rotated on the supporting parts (5, 5 '), three planetary wheels (12, 12 ＇) are integrally coupled to both ends of the wheel drive shaft (11). It is rotatably supported by the supported support plates 13 and 13 microseconds, respectively. That is, the three planetary wheels 12 and 12 'are driven to rotate about the wheel driving shaft 11 by being driven so that the support plates 13 and 13' rotate together with the wheel driving shaft 11. Of course, the planetary wheels 12 and 12 'can be rotated about the respective axes (unsigned) supported by the support plates 13 and 13'. On the other hand, there is a small auxiliary wheel (12a) extending to the rear of the planetary wheels (12, 12,), which will be described later, which is provided so that the stairs can be more easily climbed.

Next, the mounting table 10 has a portion (not shown) that is bent so as to enter between the support portions 2, 2 ＇and the auxiliary support 3, 3＇ of the body frame 1 described above, which is loaded It is connected to the wires 14 and 14 ′, which are elements of the means for elevating the base 10 (see also FIG. 6). The means comprise, as other elements, guide rollers 15, 15 ′ and other elements, which are suspended from the upper connection 4 of the body frame 1 and pass through the wires 14, 14 ′. Embodiments will also be described later.

Among the reference numerals of FIG. 1 not described above, 16 and 17 represent power switching levers and their lever shafts, 18 and 18 'represent auxiliary legs, 19 and 19' represent linear ratchets, and 20 Bands, 21 for power batteries, and 22 for switch boxes, which will also be described later.

2 is a drive unit applied to the embodiment of the present invention, which includes a motor 23 generating power, and drives the wheel drive shaft 11 of the planetary wheels 12 and 12 s described above from this motor 23. The first drive means, also the second drive means for lifting the above-described mounting table 10 from the motor 23, and the power switching means for switching the power of the motor 23 to each means.

The motor 23 is a DC motor capable of forward and reverse rotation, and the battery 21 shown in FIG. 1 is used as a power source, and is controlled through a driving circuit not shown by the operation of the switch box 22 described above. Although not specifically illustrated in the switch box 22, for example, a power switch for opening and closing the power of the battery 21, a control switch for forward and reverse rotation of the motor 23, and the motor 23 are predetermined. A chute switch for instantaneous operation to rotate at a minute angle is provided.

The motor 23 is connected to the reducer 24. The reducer 24 has a spline shaft 25 as a power take-off shaft which is rotated in a sufficiently decelerated state. On the spline shaft 25, a broach 26 having two gear portions 27 and 27 ＇formed on both sides thereof is rotatably coupled on the shaft and rotated together. The brooch 26 is coupled to the switchboard 28 to move on its axis by its movement. The switching plate has a rack 29 formed at the rear side. The pinion 30 is connected to this rack 29. The pinion 30 is fixed to the lever shaft 17 of the lever 16 described above. Under the spline shaft 25, there are two two-stage electric gears 31 and 31 지지 which are supported to rotate on copper balls, respectively. The electric gears 31, 31 ′ are selectively geared with their respective large-diameter gears 31 a, 31 a ′ with gears 27, 27 ′ formed on both sides thereof as the broach 26 moves. Either side is to be driven selectively. That is, the elements mentioned here are for switching the power of the motor 23.

Next to the electric gears 31, 31 ′, two drive gears 32, 32 ′ are also arranged to be rotatable on the same line. The drive gears 32 and 32 'are always connected to the small-diameter gear portions 31b and 31b' of the electric gears 31 and 31 ', and either side is selectively driven. As described above, the wheel driving shaft 11 supporting the three planetary wheels 12 and the shaft of the one side driving gear 32 are operatively connected through the chain sprockets 33 and 34 and the chain 35.

On the other hand, the capstan shaft 36 is provided in the lower portion of the drive unit, which is operatively connected to the shaft of the other drive gear 32 through the chain sprockets 33 ', 37 and the chain 38. Both ends of the capstan shaft 36 are fixed to the winding reel (39, 39 ') for winding the wires (14, 14') of which one end is connected to the mounting table for the lifting of the above-described loading table.

Unexplained reference numerals 40 to 45 in FIG. 2 represent brackets for supporting the above-mentioned elements.

The following describes the operation and operation according to each use state from the above embodiment.

3 is a plan view looking down for the driving unit of FIG. When the lever shaft 17 is rotated clockwise or counterclockwise by the operation of the lever described above, the pinion 30 is rotated, and the switching plate on which the rack 29 engaged with the pinion 30 is formed ( 28 is moved, and together with the switching plate 28, the broach 26 moves on the spline shaft 25 in the left or right direction. Then, either one of the gears 27 and 27 'formed on both sides of the broach 26 is the large-diameter gear portion 31a of the one side electric gear 31 or the large-diameter gear portion 31a' of the other side electric gear 31 '. Is optionally connected with.

If the above-mentioned gear part of the broach 26 is operated with the above-mentioned motor connected with the large-diameter gear part 31a of the one side electric gear 31, the power of the spline shaft 25 will be the broach 26 and this broach 26. It is transmitted to the one-side drive gear 32, which is always connected to the small-diameter gear portion 31b of the electric gear 28 through one side electric gear 31 is connected to one side gear portion 27 of the). Accordingly, one side drive gear 32 is driven, and the drive gear 32 rotates the wheel drive shaft 11 through the chain sprockets 33 and 34 and the chain 35 connecting them. However, at this time, since the other gear 27 'and the other electric gear 31 of the broach 26 are not connected, the electric gear 31 and the driving gear 32 of the other side are not driven.

On the contrary, in the state where the other gear part 27 'of the broach 26 is connected with the large-diameter gear part 31a' of the other electric gear 31 ', the power of the spline shaft 25 is the broach 26 and the other side. Since the motor is driven through the electric gear 31 ′, the other driving gear 32 is driven. Therefore, the wheel drive shaft 11 is not rotated at this time, and the shaft of the drive gear 32 'and the capstan shaft 36 connected through the chain sprockets 33', 37 and the chain 38 rotate. do. When the capstan shaft 36 is rotated, both winding reels 39, 39 'are wound or unwound wires 14, 14' according to the direction of rotation thereof, whereby the other of the wires 14, 14 ' The above loading platform connected to the end is lifted.

That is, the wheel drive shaft 11 and the capstan shaft 36 are selectively driven through a simple operation of the lever so that the stairs can be moved up and down or the loading table is lifted to a desired height. It can be shared.

4 shows a state in which the cargo 46 is loaded on the loading table 10 of the main body frame 1 and the flat surface is moved without force. Of course, at this time, the above-described motor is not operated, and two wheels touching the ground of the three planetary wheels 12 should not be pushed or dragged to move by rotating about each axis. In this case, it will be safe to operate one side gear portion 27 of the broach 26 separately from the electric gear 31 in FIG. On the other hand, if there is a risk that the cargo 46 loaded on the mounting table 10 is too large or heavy, there is a risk of dropping the cargo 46 securely to the frame 1 using the band 20. I can carry it.

FIG. 5 is the same as FIG. 4, which shows the state of moving when the stairs meet the stairs while moving on a flat surface. When the stairs are met, the above-mentioned lever is operated to allow one side gear portion 27 of the broach 26 to be connected to one side electric gear 31 to operate the motor. When the motor is operated, as described above, the wheel drive shaft 11 is driven, and the support plate 13 rotates together with the wheel drive shaft 11 so that the three planetary wheels 12 move around the wheel drive shaft 11. It will rotate clockwise. Then, as shown by the imaginary line in the figure, it is grounded in turn in the upper layer of the stairs in the direction of rotation. At this time, since the auxiliary wheel 12a reaches the end of each step to help smooth grounding of the next wheel, the movement in the step by the planetary wheel 12 idle becomes as much as that. Since the revolving of the planetary wheels 12 and 12 'is driven by power, not by manpower, the user does not need to apply a force such as raising the main frame 1, but only the handle 6 or 7 of the main frame 1. Hold right and move your feet as you move.

FIG. 6 shows a state in which the load 10 of the main frame 1 is raised to a desired height in addition to carrying the load with the multifunctional electric trolley according to the present invention. For example, when loading the cargo 46 from the luggage compartment of the vehicle or the container for transportation, or carrying it, the main frame 1 can be raised upright, and the loading platform 10 can be raised to the same height. At this time, as shown in Fig. 7, the main legs (18, 18 ') folded on the front of the connecting portion 4' of the lower end unfolded, and in the same state as in Fig. 6, without the body frame 1 is shaken or overturned Work safely

In raising the loading table 10, the pinion 30 is rotated in the opposite direction in FIG. 3 to move the brake 26 together with the switching plate 28 on the spline shaft 25 in the opposite direction, that is, to the right. The other gear part 27 'of the broach 26 is connected to the other electric gear 31', and the motor may be operated. If the gear 27 'of the broach 26 and the gear of the electric gear 31' are displaced with each other and are not engaged well, the pinion may be operated after operating the conventional chute switch provided in the above-described switch box. (30) Simply rework the lever. In this way, when the other gear part 27 'and the electric gear 31' of the broach 26 are engaged and the motor is operated, the power of the spline shaft 25 causes the broach 26 and the other electric gear 31 'to move. It is transmitted to the other drive gear 32 'through, and then the capstan shaft 36 is configured through the chain sprockets 33', 37 and the chain 38. As a result, the winding reels 39 and 39 'coupled to both ends of the capstan shaft 38 are rotated in the winding direction of the wires 14 and 14'. Referring to FIG. 8, the ends of the wires 14 and 14 'are connected to the mounting table 10 through the guide rollers 15 and 15' suspended from the upper connecting portion 4 of the main frame 1. Therefore, the loading table is raised by pulling the wires 14 and 14 '. In this figure, the linear ratchets 19, 19 'attached to the inside of the auxiliary support 3, 3' of the main frame 1, respectively, are naturally disconnected or connected to the gears of the drive unit described above. (14, 14 ') is to prevent the natural descent so that the loading table 10 does not fall down in an unexpected situation such as disconnection.

That is, as shown in FIG. 9, the two latches 47 and 47 'are supported by the pins 48 and 48' at the rear of the mounting table 10 so that their respective ends are guide supporting walls 49 and 49. Pass through ') to allow each tooth of the ratchet 19, 19' to enter and exit. In addition, by installing the rotary plate 50 on the rear of the mounting table 10 and connecting the rear ends of the two latches (47, 47 ') to the upper and lower edges thereof facing 180 °, respectively, in accordance with the rotation of the rotary plate 50 Two latches 47, 47 'each move in a corresponding corresponding direction. Here, the rotating plate 50 can be operated by attaching the handle 52 to the shaft (51). That is, in the state as shown in FIG. 9, unless the rotary plate 50 is turned counterclockwise, the ends of the latches 47 and 47 'are caught by the teeth of the retreats 19 and 19'. ) Can not be lowered on the loading table (10). Therefore, even if the above-described wire is broken, the accident due to the fall of the mounting table 10 does not occur.

In order to lower the raised mounting table 10 again, the handle 52 is operated to rotate the rotary plate 50 in the opposite direction so that the ends of the latches 47 and 47 'are closed by the latches 19 and 19'. The above-mentioned motors can be rotated in a state where they are separated from the teeth.

As described through the above embodiments, the multifunctional electric trolley according to the present invention uses power to retain the function of lifting skis as well as using a staircase, thereby enhancing the professionalism and efficiency of cargo transportation. In particular, there is no concern about safety accidents, so non-specialists can easily know and use them.

The multi-functional electric cart of the present invention is used for transporting moving objects in low-rise apartments without elevators, and is useful for transporting cargoes in public buildings such as department stores, hotels, airports, construction sites, etc., and also steep and uneven slopes. For example, it can be used to carry heavy loads on hiking trails or other necessities of base camp.

The present invention, in its implementation, is not limited to the drawings and the foregoing description, and more variations are possible within the scope of the following claims. For example, modifications may be made to the structure of the body frame, the arrangement of the elements appearing in the above-mentioned driving portion, and the embodiments of each means.

The present invention does not exclude the inclusion of another preferred means, and of course also its modifications to similar fields, for example for the transport of patients in baby carriages and hospitals.

Claims (12)

A main frame 1 having a handle; A loading table 10 installed on the main frame so as to be movable up and down; A bar quick coaxial shaft 11 rotatably supported by the main body frame 1; Two sets of three planetary wheels (12, 12 ') disposed at equal intervals around the wheel drive shaft (11) and supported to rotate and revolve around the wheel drive shaft (11); Wheel driving means including a driving source for driving the wheel driving shaft 11 so that the planetary wheels revolve; A multifunctional electric pure water wheel having elevating driving means for elevating the mounting table (10), wherein the elevating driving means includes: a capstan shaft (36) connected to a driving source and driven to rotate; A winding reel (39, 39 ') coupled to the capstan shaft (36); Guide rollers 15 and 15 'installed on the upper body frame; One end is connected to the mounting table 10, and the outer end 14, 14 ′ is wound on the winding reel 39, 39 ′ via the guide roller. Multi-functional electric trolley which can load and carry the loaded cargo at the desired height. The multifunctional electric cart as set forth in claim 1, wherein said wheel driving means includes a speed reducer for reducing the rotational speed of the drive source. 3. The wheel drive means according to claim 1 or 2, characterized in that it comprises a pair of chain sprockets (33, 34) and a chain (35) for transmitting the rotational force of the drive source to the wheel drive shaft (11). Multifunctional electric cart. 2. A handle according to claim 1, further comprising handle bars (8, 8 ') formed with said handles, said handle bars (8, 8') being retractably inserted into said body frame (1) to adjust the length thereof. Functional electric trolley characterized in that it became. The multifunctional electric trolley according to claim 1, further comprising a band (20) for fixing the cargo carried on the mounting table (10) to the main frame (1). The auxiliary wheel (12a) according to claim 1, wherein the auxiliary wheel (12a) is fixedly supported on the body frame (1) at the side of the planetary wheels (12, 12 ') and is grounded at the end of the stairs in the idle state of the planetary wheels (12, 12'). Multi-function electric cart, characterized in that it is further provided. The multifunctional device according to claim 1, further comprising auxiliary legs 18 and 18 'which are installed to be foldable in the main body frame 1 and are deployed to support the vertical posture of the main body frame 1. Electric cart. The multifunctional electric cart according to claim 1, further comprising lowering prevention means for preventing the loading table 10 from naturally descending downward. 9. The linear ratchets 19 and 19 'according to claim 8, wherein the lowering prevention means is fixed to the main frame 1, and the teeth of the ratchets 19 and 19' are placed on the loading table 10. Latches 47 and 47 ', which are supported to move in and out of the furnace end, a rotary plate 50 rotated to reciprocate the latches 47 and 47', and a handle for operating the rotary plate 50. 52, a multifunctional electric cart. 10. The multifunctional electric puree according to claim 9, further comprising a support wall (49, 49 ') for allowing the lowering prevention means to move and support the latch (47, 47'). A main frame 1 having a handle; A loading table (10) for loading the cargo supported on the main frame (1) to be movable up and down; A wheel drive shaft 11 rotatably supported by the body frame 1; A plurality of planetary wheels 12 and 12 'disposed on the same circumference around the wheel drive shaft 11 and supported to rotate and revolve around the wheel drive shaft 11; First driving means for driving the wheel driving shaft; Second driving means for elevating the mounting table 10; A motor 23 for driving the first and second driving means; In the multifunctional electric trolley having power switching means for selecting and switching the power of the motor 23 to the first driving means and the second driving means, the power switching means is a spline driven by the motor 23. A shaft 25; A broach 26 coupled to the spline shaft 25 and having two gear portions 27 and 27 'for driving the first driving means and the second driving means at both ends thereof; A switching plate 28 coupled to the broach 26 so that the broach 26 can be rotated; Multifunctional electric cart, characterized in that it comprises a moving member for moving the switching plate 28 in the spline shaft direction. The method of claim 11, wherein the moving member is provided with a rack 29 formed on the switching plate, the pinion 30 engaged with the rack and a lever fixed to the pinion to rotate the pinion, so that the lever is rotated And the switchboard moves the rack along the spline shaft.