CZ32040U1 - A lifting device, especially for lifting motorcycles - Google Patents

Description

Technical field

The technical solution relates to a lifting device which is designed especially for lifting motorcycles weighing up to 600 kg in space-restricted workshops.

BACKGROUND OF THE INVENTION

When servicing and repairing equipment, it is often necessary to access the underside of the vehicle or to position the vehicle in such a way that technical personnel can access the vehicle as much as possible without bending too much. Commonly used mast lifting equipment in the workshops provides the operator with convenient access to all parts of the vehicle without unnecessary bending and hassle-free use of a wide range of tools, jigs and special jigs that could not be used without lifting the vehicle. However, these are space-dimensional, cost-intensive and portable devices that are not adapted for lifting two-wheelers.

Mobile lifting devices are also known which are basically divided into devices lifting only part of the vehicle or the whole vehicle. It is known in the art to lift a whole vehicle lifting device based on a scissor lifting structure with a different design of the drive unit, its mounting and auxiliary transmission means to reduce the necessary lifting force, but which are not directly adapted for lifting two-wheelers.

US 2937852 and US 6182796 disclose scissor lifting devices which are driven by a pair of hydraulic or pneumatic pistons positioned longitudinally in one pair of scissor lift arms. A pair of struts, one for each piston cylinder pivotally anchored in the middle of the piston cylinder head of each of the pair of piston mechanisms, is implemented to reduce the weight of the piston cylinder by gravity. Thus, the gravity force is not fully transferred to the piston mechanism, but is partially transferred to the rigid lever pin.

US 3891108 discloses a scissor lift with a piston stroke, wherein a paired piston cylinder articulation system is used to reduce the stroke force in the first stroke stages, the smaller of the pistons exerting their stroke through a short auxiliary lever supporting the pin over which the stroke is greater cylinders. After a certain stroke of the smaller piston has been reached, the piston is ejected from the bearing and effectively stops the piston. The presented device is larger in its folded state and is not designed as mobile.

The disadvantage of piston solutions is, in particular, the relatively large width of the piston cylinders and hence the height of the composite jack, which increases with the need for an increasing load-bearing capacity of the lifting device. The described lifting devices are designed primarily for lifting cars and other two-wheeled motor vehicles and are not closely adapted to two-wheeled vehicles, in which the lateral load distribution does not provide automatic lateral stability and there is a risk of falling to the side without supporting accessories. The design for two-track vehicles is also derived from the frequent existence of a pair of support rails instead of a platform construction, since a two-wheeled vehicle does not require direct access from the bottom of the vehicle, but rather obliquely from the bottom and side. On the other hand, in the case of large platforms, there is the possibility of placing the motorcycle on one side only, but this prevents the workshop specialist's actual access to the other side of the machine. A significant disadvantage of these devices is the height of the jack. On heavier motorcycles that push on the jack, unlike cars that drive on the platform under their own power, overcoming larger height approach dimensions is physically very difficult and therefore difficult for the operator.

From US 7413056 and US 9718657, a scissor lift of the platform type is known in which the lift mechanism is based on the principle of being driven by an electric motor which drives the winding

The belt winding device thus attracts the yoke segment of its end fixation, thereby raising the stroke. Reducing the need for the lifting force on the lever is ensured either by placing the lifting segment in the middle of the scissor mechanism or by transmitting the force through the auxiliary lifting cam mechanism. The mechanisms used are again higher in height when folded, and moreover, the drive is provided by an external drive unit, which is impractical for a mobile lifting device. Again, the device does not solve the attachment of two-wheelers or suitable access to them.

From CZ 13148 with modifications according to CZ 26342, a mobile scissor lift with a screw drive lift is known. Drive is possible electrically or manually, but no permanent drive is installed in this solution. The jack has two skids. Again, this construction is not suitable for lifting a two-wheeled vehicle. In addition, the skids not only do not have a system for lateral fixation of a two-wheeled vehicle but are also pivotable so that the two-wheeled vehicle would be completely unstable on them. The advantage of the screw drive is the self-locking of this screw, which ensures constant fixation of the jack in all lift positions. Supports for this type are only recommended, while for previous piston and belt drives, the fixation of the jack in the raised position is a necessity. This jack is in a mobile version allowing the jack to be moved only in the stowed position. This jack is not equipped with any known system for reducing the necessary lifting force in the first stages of the stroke.

The deficiencies of the known lifting devices suitable for lifting motorcycles, consisting mainly of low lifting force, large dimensions, in particular height in the folded state and little or no mobility, have the task of eliminating the proposed technical solution.

The essence of the technical solution

The above-mentioned drawbacks are eliminated by a lifting device intended especially for lifting motorcycles weighing up to 600 kg in space-restricted workshops according to the proposed technical solution.

The lifting device designed especially for lifting motorcycles consists of a mounting platform for fastening the motorcycle to be lifted, a base plate ensuring stabilization of the device to the pad and transfer of weight to the pad and a scissor lifting mechanism ensuring the device lift and its fixation in the raised position.

As a standard, the scissor mechanism is formed from two opposite pairs of lifting arms connected to each other by pivot pins halfway along their length. The scissor mechanism is preferably coupled to a carriage which transmits the horizontal traction force generated by the electric drive and the bolt to the lift arms by changing the horizontal force to the vertical lift force. The base plate is then provided with side profiles in the shape of the letter "U" in which the guide wheels mounted on the lower ends of the front lift arms are mounted.

The device is designed with a permanent electric drive, which is connected to a movement screw arranged below the mounting platform and passing through a working nut located in a carriage sliding beneath the mounting platform, whereby the rotary motion of the electric motor changes into a sliding motion. This sliding movement in the horizontal plane is due to the movement of the trolley having guide grooves in the rear of the trolley in which the sliding pins of the upper ends of the rear lift arms are accommodated and the lower ends of the front lift arms are sliding and lower the ends of the rear lift arms are pivotally attached to the base plate, converted to a vertical lift movement.

The device is equipped with an auxiliary transmission means for reducing the lifting force in the extreme position of the scissor lifting mechanism, which allows the required lifting force to be reduced, the arm to be shortened and the rotation angle to be reduced. This means comprises a pair of lever struts having one end of the arms mounted rotatably to the carriage and the other end provided with a recess

-2GB 32040 U1 and roller shutters. The lowering of the lifting force is ensured by the fact that the pair of lever struts is mounted in the lower part rolling on the lower supporting platform formed by a firm connection of the front lifting arms by a stiffener with two support pins and two traveling wedges. As the carriage moves towards the electric motor, the fixed ends of the lever struts are shifted, the motion is transferred to the lower ends, which roll through the wedges thanks to the rollers and simultaneously transmit the gravity force and open the scissor mechanism. At some point, the lower end of the lever struts, which is provided with a recess, locates with a fixed support pin on the travel tracks on the reinforcement. Further upward movement of this free connection is disengaged at a particular lifting stage and only the main scissor lift arms take over the power transmission.

In a preferred embodiment, the carriage is U-shaped, the side arms of which have elongate guide grooves extending in the direction of the arms at the ends, and the lever struts are fastened to the side arms of the carriage at the ends of the guide grooves in the drive direction. For the duration of engagement of the lever struts, the ends of the lift arms move in the grooves of the truck without the need to transmit gravity until the auxiliary transmission means are disengaged to reduce the lifting force.

In a preferred embodiment, the power transmission from the electric motor to the motion screw is performed by means of a working nut secured by a safety nut, which also ensures the self-locking of the screw drive.

In a preferred embodiment, the mounting platform is rectangular and has at the front edge a projecting trapezoidal region on the underside of which a drive and a part of the frame for accommodating the carriage are arranged. The remaining part of the carriage frame is arranged below the rectangular part of the assembly platform.

In a further preferred embodiment, a clamping device for fastening the front wheel of the motorcycle and stabilizing it against lateral fall is fastened to the upper side of the trapezoidal region of the lifting device.

In another preferred embodiment, in the rear of the assembly platform, the cutout is covered by a pivotably mounted tilting plate which, when tilted to a vertical position, is lockable on a crossbar connecting the lower ends of the front lift arms. Supporting the rear wheel, after tilting the plate to the vertical position, is secured by a support bracket mounted on the plate in the folded state.

In a further preferred embodiment, a slope is attached to the lifting device by means of the draw bars, which serves to facilitate pushing the motorcycle onto the lifting device before fixing and stabilizing it in the device.

In a preferred embodiment, the castors are removably attached to the base plate to travel the entire lifting device in the stowed position. The castors are rotatably lockable in the shape holes formed in the side profiles of the base plate and the mounting platform.

In a further preferred embodiment, the lifting device is designed such that the height of the lifting device in the folded form does not exceed a height of 100 mm and the maximum lifting capacity of the lifting device is 600 kg.

The lifting device preferably combines elements of the scissor structure of the jack, the high mobility of the device and the installation of a fixed electric drive in the jack for driving the movement screw. Preferably, the device also utilizes clamping elements to fix placed two-wheelers, position the drive mechanism of the lifting mechanism in the lifted portion of the device, and assist transmission means to reduce the necessary lifting force in the first stages of the lifting cycle. However, the main advantages of the equipment are its large lifting force, small dimensions and the possibility of moving it in the workshop.

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Clarification of drawings

The technical solution will be explained in more detail by means of the drawings in which they show

Giant. 1 is a top perspective view of the lifting device with the motorcycle clamped in the raised position,

Giant. 2 is a bottom perspective view of the lifting device with the motorcycle clamped in the raised position,

Giant. 3 is a top perspective view of the lifting device with the motorcycle clamped in the raised position, with the folding plate folded down and the rear wheel support bracket,

Giant. 4 is a perspective view of the lifting device with the motorcycle in the ground position,

Giant. 5 shows a section through the lifting device in the ground position, without a mounting platform,

Giant. 6 is a cross-sectional view of the lifting device of FIG. 5 in the position of travel rollers onto the wedges,

Giant. 7 is a cross-sectional view of the lifting device of FIG. 5 in the position of travel rollers leaving the wedges,

Giant. 8 shows a cross-section through the lifting device according to FIG. 5 in the position of the lever strut against the support pins,

Giant. 9 is a cross-sectional view of the lifting device of FIG. 5 in the raised position;

Giant. 10 is a perspective view of the device in the abutment position of the support struts, without the mounting platform

Examples of technical solutions

It is to be understood that the particular embodiment of the invention described and illustrated below is presented by way of illustration and not as a limitation of the invention to the example given. Those skilled in the art will find or will be able to provide, by routine experimentation, more or less equivalents to the specific embodiments of the invention described herein.

An embodiment of the invention is shown in FIGS. 1 to 10. FIGS. 1 and 10 show a lifting device 1 which is used in particular for lifting motorcycles 2, comprising two lifting arms 5, 51 of a scissor lifting structure and two platforms. one of which forms the base plate 4 and the other a mounting platform 3 for lifting the motorcycle 2.

According to FIG. 1, the scissor mechanism consists of two pairs of lifting arms 5, 51 interconnected by pivot pins 16 at half their length. 2 and 10, the scissor lift mechanism is coupled to a carriage 10 which transmits the horizontal traction force generated by the electric drive 6 and the motion screw 7 to the lift arms 5, 51 by changing the horizontal force to a vertical lift force. The base plate 4 is then provided with U-shaped side profiles 28 in which guide wheels 29 are mounted mounted at the lower ends of the front lift arms 5.

The lifting device is designed with a permanent electric drive 6 for remote control 32,

32040 U1 which is connected to the movement screw 7 arranged below the mounting platform 3 according to FIG. 10 and passes through a working nut 8 located in the carriage 10 mounted slidingly below the mounting platform 3 and secured by a safety nut 9. This sliding movement in the horizontal plane is a carriage 10 having guide grooves 11 formed at the rear of the carriage 10 in which the sliding pins 12 of the upper ends of the rear lift arms 5a are received and the lower ends of the front lift arms 5 are displaceably mounted in the base plate 4 and the lower ends of the rear lift arms The lifting arms 51 are rotatably mounted to the base plate 4, converted to a vertical lifting movement.

The device is equipped with an auxiliary transmission means for reducing the lifting force at the extreme position of the scissor lifting mechanism, which allows the required lifting force to be reduced by shortening the force arm and reducing the rotation angle. The means is constructed such that it comprises a pair of lever struts 13 having one end of the arms mounted rotatably to the carriage 10 and the other end provided with a recess 14 and two pairs of travel rollers 15. Referring to Figures 6, 7 and 10, The stiffener 17 has two support pins 19 and two carriage wedges 18. The other two opposite wedges 18 are fixedly fixed in the upper part of the rear lift arms 52 As the carriage 10 moves towards the drive 6, the upper ends are shifted of the lever struts 13, to transmit movement to their lower ends, which, due to the pairs of travel rollers 15, roll over the travel wedges 18 and opposite wedges 18 'while transmitting the gravity force and opening the scissor lift mechanism. At some point in Figs. 9 and 10, the lower end of each lever strut 13 provided with a recess 14 engages the thrust pin 19 of Fig. 8. only main lift arms 5, 51

In the collapsed state, the lever struts 13 do not transmit any lifting force. Upon commencement of the lifting process, rolling of the pairs of travel rollers 15 on the top of the travel wedges 18 and on the bottom of the opposite wedges 181 is initiated, thereby transferring the lifting force through these lever struts 13 to the mat formed by the base plate 4. At the same time At the same time, these opposing wedges 18 'are lifted, thereby effectively raising the rear lift arms 51 and opening the scissor mechanism of the lifting device 1. This phase continues until such an angle α is reached, when the assembly platform 3 is located at a height of 100 mm to 550 mm above the ground. This height corresponds to an angle α in the range of 178 ° to 145 °. The specific value of height and angle corresponds to the particular embodiment of the lifting device 1. In the next stage of the double track roller 15 leaves the traveling and opposite wedges 18, 18 'and the recesses 14 of the lever struts 13 rest against the support pins 19. The lever arms 13 engage the support pins 19 and They lift the assembly platform 3 instead of the rear lift arms 51 This is done at the height of the assembly platform 3 from 550 mm to 830 mm above the ground, which corresponds to the opening angle of the lift arms 5, 51 and from 145 ° to 118 °. The specific value of the height and angle corresponds to the particular embodiment of the lifting device 1. In the next phase of lifting, this free connection is disconnected and only the main lifting arms 5, 5j begin to transmit the force transmission.

Referring to FIG. 10, the carriage 10 is U-shaped, the side arms of which have elongate guide grooves 11 extending in the direction of the arms at the ends and the arms of the lever strut 13 are fastened to the side arms of the carriage 10 at the ends of the guide grooves 11. For the duration of engagement of the lever struts 13, the ends of the rear lift arms 51 move in the guide grooves 11 of the carriage 10 without the need to transmit a gravity force until the auxiliary transmission means for reducing the lifting force, ie. until the recesses 14 are lifted from the support pins 19.

According to FIGS. 2 and 10, the mounting platform 3 is rectangular and has, at the front edge, a projecting trapezoidal region 20 on the underside of which is a drive 6 and a portion of the carriage frame 21. platforms 3.

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According to FIG. 1, the motorcycle 2 is secured behind the front wheel in the clamping device 22 for clamping the front wheel to provide lateral stability on the mounting platform 3. In the rear of the mounting platform 3, the cut-out 23 is covered by a pivotably mounted tilting plate 24, which can be locked on a crossbar 25 when folded vertically, as shown in Fig. 3 connecting the lower ends of the front lift arms 5. it is secured to a vertical position by a support bracket 26 mounted on the hinged plate 24 in the hinged state. According to FIG. 3, a ramp 27 is fastened to the lifting device 1 by means of the drawbars 34, which serves to facilitate the pressing of the motorcycle 2 onto the lifting device 1 before it is fixed and stabilized therein.

According to FIGS. 3 and 4, the lifting device 1 is provided with four traveling wheels 30 with an unrestricted maneuver mounted one at each of the four corners of the folded lifting device 7. To attach the removable castors 30, shaped holes 31 are formed in the side wall of the mounting platform 33 and the side pup of the base plate 4.

Industrial applicability

According to the technical solution, the lifting device will find its application mainly in workshop facilities that focus on the repair of two-wheeled motor vehicles.

PROTECTION REQUIREMENTS

Claims (13)

A lifting device (1), in particular for lifting motorcycles (2), comprising a mounting platform (3), a base plate (4), a scissor lift mechanism arranged between the base plate (4) and the clamping plate (3) and consisting of two opposite pairs of lifting arms (5, 5 ') connected to each other by pivot pins (16) connected to the drive (6) and provided with auxiliary transmission means for reducing the lifting force at the extreme position of the scissor lifting mechanism, characterized in that the drive (6) is formed by an electric motor is connected to a movement screw (7) arranged below the mounting platform (3) and through a working nut (8), which is connected to a carriage (10) sliding below the mounting platform (3), guide grooves (11) receiving sliding pins (12) of the upper ends of the rear lift arms (5 '), the lower ends of the front elevators and the lower ends of the rear lift arms (5 ') are pivotally attached to the base plate (4), and the auxiliary transmission means for reducing the lifting force is a lever arm (13) having two arms fixed at one end to the carriage (10) and provided with recesses (14) and pairs of travel rollers (15) at the other ends, with the front lift arms (5) provided with a reinforcement (17) in the lower part below the pivot pins (16) with two support pins (19) and two carriages (18) and rear lift arms (5 ') are provided in their upper part above the pivot pins (16) with two opposite wedges (18'), where in the position of opening the lift arms (5) 5 ') at an angle α of 145 ° to 118 ° corresponding to the height of the mounting platform (3) in the range of 550 mm to 830 mm, the recess (14) of the arms of the lever struts (13) on the support pins (19) and zdvižných r amen (5, 5 ') at an angle α from 178 ° to 145 °, corresponding to the height of the mounting platform (3) from 100 mm to 550 mm, a pair of rollers (15) on the running wedges (18) and opposite wedges (18') . Lifting device according to claim 1, characterized in that the carriage (10) has a U-shaped plan view, the side arms of which have longitudinal guide grooves (11) extending in the direction of the arms at their ends and arms of the lever struts (13). are attached to the side arms of the carriage (10) at the ends of these guide grooves (11) in the direction of the drive (6). -6GB 32040 U1 Lifting device according to claim 1 or 2, characterized in that the carriage (10) is secured to the movement screw (7) by a safety nut (9). Lifting device according to one of Claims 1 to 3, characterized in that the mounting platform (3) is rectangular and has at the front edge a projecting trapezoidal region (20) on the underside of which the drive (6) and the frame part ( 21) for accommodating the carriage (10), the remaining portion of the frame (21) being arranged below the rectangular portion of the mounting platform (3). Lifting device according to claim 4, characterized in that a clamping device (22) for clamping the front wheel of the motorcycle (2) is mounted on the upper side of the trapezoidal region (20). Lifting device according to one of Claims 1 to 5, characterized in that in the rear part of the mounting platform (3) the cut-out (23) is covered by a pivotably mounted tilting plate (24) which can be locked on a crossbar ( 25) connecting the lower ends of the front lift arms (5). Lifting device according to claim 6, characterized in that a support bracket (26) for supporting the rear wheel of the motorcycle (2) is mounted on the tilting plate (24) in the vertical position. Lifting device according to claim 6 or 7, characterized in that a ramp (27) is fastened to the crossbar (25) by means of rods (34). Lifting device according to one of Claims 1 to 8, characterized in that the base plate (4) is provided with U-shaped side profiles (28) in which the guide wheels (29) mounted at the lower ends of the front wheels are mounted. the lifting arms (5). Lifting device according to one of Claims 1 to 9, characterized in that the wheels (30) for detaching the entire lifting device (1) are detachably fastened to the base plate (4). Lifting device according to claims 9 and 10, characterized in that the traveling wheels (30) can be rotatably locked in the shaped holes (31) formed in the side profiles (28) of the base plate (4). Lifting device according to one of Claims 1 to 11, characterized in that the mounting platform (3) has side walls (33) in which there are shaped holes (3Γ) for rotatably lockable fastening of the traveling wheels (30). Lifting device according to one of Claims 1 to 12, characterized in that the height of the lifting device in the folded form does not exceed a height of 100 mm and the maximum lifting capacity of the lifting device is 600 kg.