EP0473238B1 - Carrier for a vehicle lifting device - Google Patents
Carrier for a vehicle lifting device Download PDFInfo
- Publication number
- EP0473238B1 EP0473238B1 EP91202201A EP91202201A EP0473238B1 EP 0473238 B1 EP0473238 B1 EP 0473238B1 EP 91202201 A EP91202201 A EP 91202201A EP 91202201 A EP91202201 A EP 91202201A EP 0473238 B1 EP0473238 B1 EP 0473238B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lifting device
- carriage
- extension piece
- carrier
- arm portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
- B66F7/04—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars hydraulically or pneumatically operated
Definitions
- the invention relates to a vehicle lifting device comprising at least one column, with a vertically movable carriage to which bearing arms for supporting a vehicle are connected and drive means for moving the carriage upward, wherein at least one of the bearing arms of the carriage comprises a base arm pivotally connected to the carriage and having a telescopically extending arm portion which comprises on its free end a carrier formed by a horizontal bearing platform with a downward protruding screw body received in a screw-threaded hole of the arm portion.
- Such lifting devices are generally known. These can be embodied as a one- or two-column lifting device having fixed columns placed at the sides or as a jack lifter with one telescopically extending column.
- the movement possibilities of the bearing arms namely pivoting, sliding out and the possibility of screwing the carrier up or downward, are required in order to accurately position the bearing platform of the carrier in a desired position under a support of the vehicle for lifting.
- the lifting device can be set into operation and the vehicle safely lifted.
- the extending arm portion is a steel rod.
- the threaded hole into which engages the screw body of the carrier.
- the bottom end of the screw body here protrudes beyond the hole on the underside.
- This protruding screw body portion forms a safety risk.
- the lifting device In the raised situation of the lifting device it is located at the head height of persons working beneath the raised vehicle. They can easily collide with the screw body with all the danger of head injuries that this implies.
- the invention has for its object to provide a vehicle lifting device of the type described in the preamble which does not have this drawback and is therefore safer to use.
- the extending arm portion comprises on its free end a mould-formed extension piece in which the threaded hole receiving the carrier is formed and which comprises a protective cap extending downward around the elongation of the threaded hole and enclosing the bottom end of the screw body. Direct contact with the screw body of the carrier is prevented by the protective cap.
- the mould-formed extension piece it is possible in economic manner to use large rounded radii at the location of the end of the bearing arm, whereby the danger of injury through collision is obviated or at least very greatly limited.
- a favourable embodiment is characterized in claim 2.
- the mould required for manufacturing the extension piece can hereby be embodied more simply and thus more cheaply, while the bottom end of the screw body is moreover accessible when the cover is removed, which is favourable for assembly, and particularly for arranging of a locking ring thereon.
- the cover is preferably made of a soft plastic.
- the extension piece is manufactured from a high-grade plastic. It has been found that in a design with a relatively large volume, which to obtain the above mentioned large rounded radii is already per se desirable, it is possible to fulfil all strength requirements with modern high-grade plastics.
- the advantage of using plastic is of course a comparatively low cost price of the mould-formed extension piece.
- the use of plastic moreover allows a great freedom of design, whereby an attractive finish and a robust appearance of the bearing arms can be obtained.
- a very suitable plastic is a polyamide or polyarylamide with glass fibre filling. These materials have properties suitable for the intended application.
- the extending arm portion is a hollow profile and the extension piece comprises a connecting protrusion fitting into the hollow profile.
- the extending arm portion can simply be sawn from a greater length and is therefore relatively inexpensive.
- the means necessary to obtain a good fixing of the extension piece to the hollow profile can be realized in simple manner on account of the great freedom in the design of the extension piece.
- the step of claim 9 is preferably applied.
- the large diameter of the screw thread contributes to the robustness of the construction and, when a pitch of the trapezium screw thread is selected that is normal at the said diameter, the advantage is furthermore achieved that a considerable height adjustment of the carrier is already obtained with a limited rotation, so that setting of the carrier to the desired height can take place very rapidly.
- the vehicle lifting device 1 according to the invention shown in fig. 1 comprises two hollow columns 2 of sturdy steel plate, which have a substantially C-profile as shown particularly in fig. 2. Each column 2 thus has a channel 4 on one side.
- Each column 2 is fixedly welded onto a base plate 11 which is anchored in the ground using bolts 12.
- each hollow column 2 Received into each hollow column 2 is a vertically movable carriage 3 which is provided at its bottom end and top end with guide wheels 5 and 6 respectively.
- the basic body of the carriage 3 consists of a U-profile. The construction is such that the body of the U-profile of the carriage 3 lies in the channel 4 of the column 2 such that it lies in one plane with the profile parts of the column 2 adjoining the channel 4.
- each carriage 3 On the bottom end each carriage 3 bears a support construction 7 which protrudes outside the column 2 and to which two bearing arms 8 are pivotally mounted. Integrated into the swivel bearings 10 is an arresting mechanism which can lock the relevant arm 8 in a chosen swivel position. Situated on the end of an extending portion of each arm 8 further shown in fig. 3 is a carrier 9, the top surface of which can grip a support on the bottom of a vehicle for raising. To lift a vehicle the arms 8 are swivelled into such a position and extended so far until all four carriers 9 of the lifting device 1 are situated under a relevant support of the vehicle so that the vehicle can be lifted by the simultaneous movement of the two carriages 3 in both columns 2.
- the lifting device 1 For synchronous upward movement of the carriages 3 the lifting device 1 is provided with drive means.
- these drive means comprise a hydraulic jack 14 mounted in the left-hand column 2 in fig. 1.
- the cylinder 15 of this jack 14 is fixedly connected to the carriage 3 and the piston rod 16 is fixedly connected at its top end to the column 2.
- the piston rod 16 has a central bore 36 to the outer end of which is connected a hydraulic oil feed 17.
- hydraulic oil under pressure is pressed via the feed 17 and the bore 36 above the piston into the cylinder 14 whereby the cylinder 14 and therefore the carriage 3 are moved upward.
- This chain transmission comprises a chain 19 which is fixedly mounted on a support 18 forming an entity with the carriage 3.
- the chain 19 extends downward from this support 18 and runs around a chain wheel 20 that is rotatable about a shaft fixedly connected to the column 2.
- the chain From the chain wheel 20 the chain extends upward via a chain wheel 21 at the top of the left-hand column 2 through a cross beam 13 mutually joining both columns 2 at their top ends, over a chain wheel 22 at the top of the right-hand column 2 to the right-hand carriage 3.
- the end of the chain 19 is fixedly connected to the carriage 3 by means of a safety construction 23 not further shown in fig. 2.
- This safety construction 23 is embodied such that if the chain 19 should break the rod 24 mounted fixedly in the column 2 is gripped immediately, thus preventing the right-hand carriage 3 from falling downward.
- a safety device which, during normal use, also prevents undesired downward movement of the carriages 3, for example as a result of a leakage in the hydraulic jack 14.
- This safety device comprises a hole strip 27 mounted fixedly in the left-hand column with which a ratchet 28 co-acts that is connected pivotally to the left-hand carriage 3 by means of a shaft 29.
- the ratchet 28 is embodied such that it allows an upward movement but in the case of downward movement grips into a hole in the hole strip 27.
- the ratchet 28 can be rotated round the shaft 29 in counter-clockwise direction as seen in fig. 2 by an electromagnet 30.
- This electromagnet 30 is activated when the control device, which is not described further here, receives a command to lower the lifting device.
- the described chain transmission ensures that both carriages 3 run synchronously unless, as described, the chain breaks.
- the right-hand carriage 3 is then instantaneously locked on the rod 24.
- Chain breakage is moreover detected by a switch means, not further described here, and this switch means generates a signal to the control device whereby the lifting or lowering movement is immediately ended.
- a switch means not further described here, and this switch means generates a signal to the control device whereby the lifting or lowering movement is immediately ended.
- the mentioned switch means likewise detects when the chain 19 becomes slack. This can occur when during lowering the right-hand carriage is obstructed by a support or the like accidentally left behind under the device. The lowering movement will in this case also be switched off immediately.
- These safety devices are otherwise generally per se known.
- Another per se known safety device is a sensor wire 37 arranged directly beneath the cross beam 13 which activates a switch as soon as the wire 37 is pressed upward, for example by the roof of a vehicle. To prevent damage through contact with the cross beam 13 the lifting movement is then immediately switched off.
- the bearing arm 8 comprises a hollow base arm 40 pivotally connected to the support 7 of the carriage and a telescopically extending arm portion 41.
- the extending arm portion 41 bears on its end towards the carriage a stop 42 which can co-act with a stop 43 against the top face of the hollow base arm 40 in order to prevent the sliding part 41 being pushed too far outward.
- the sliding portion 41 is pushed into the base arm 40 from the left as seen in fig. 3 before the carrying construction 10 is mounted.
- a mould-formed extension piece 44 Arranged on the free end of the sliding arm portion 41 is a mould-formed extension piece 44.
- This extension piece 44 has a connecting protrusion 45 which can be pushed into the sliding portion 41.
- a threaded hole 49 is formed in the extension piece 44 into which engages the screw body 48 of a carrier 9.
- This carrier 9 comprises in addition to the screw body 48 a bearing platform 46 provided with a covering 47 of rubbery material such as soft polyurethane.
- the bearing platform 46 is positioned under a support on the bottom of the vehicle in order to lift up the vehicle.
- the bearing platform 46 can be herein adjusted to a suitable height by rotating the carrier 9.
- the screw body 48 of carrier 9 has a locking spring 50 which prevents it being possible to entirely unscrew the carrier 9 from the threaded hole 49.
- the extension piece 44 comprises a protective cap extending downward around the elongation of the threaded hole 49.
- This protective cap is formed by a sleeve 51 forming an entity with the extension piece 44 and a cover pushed thereon at the bottom end.
- the protective cap formed by the sleeve 51 and the cover 52 encloses the bottom end of the screw body 48 so that a user cannot collide with it.
- extension piece 44 is mould-formed there is a large degree of freedom of design. It is hereby possible in particular to employ large rounded radii in economic manner whereby the danger of injury through collision is greatly limited or even eliminated.
- the cover 52 can, if desired, be manufactured from a soft plastic, likewise to eliminate the danger of injury through collision.
- extension piece 44 as well as the carrier 9 are formed in this embodiment in a mould from a polyamide or polyarylamide with glass fibre filling. Through the use of this high-grade plastic the extension piece 44 and the carrier 9 obtain mechanical properties as desired for the intended application.
- the screw body 48 of carrier 9 has a large diameter.
- a diameter in the order of magnitude of 50 mm is used.
- the large diameter with correspondingly large pitch of the screw thread moreover has the consequence that a considerable height change of the bearing platform 46 already occurs with only a small rotation of the carrier 9.
- the carrier 9 can hereby be set very rapidly to the desired height.
- the extension piece 44 is mounted in the sliding arm portion 41 by means of a snap-in connection.
- the fastening protrusion 45 comprises in its lower wall a lip 55 which carries a chamfered cam 53.
- a hole 54 is formed in the sliding arm portion 41.
- extension piece 44 As noted earlier, the freedom of design is very considerable because the extension piece is mould-formed. As can be seen in the figures, a robust and attractive appearance is already obtained owing to the large rounded radii used, particularly the large diameter of the sleeve 51, and owing to the large diameter of the screw body 48.
- ribs 56 are arranged on the side faces of the extension piece which serve on the one hand as embellishment while the end faces of which moreover serve as stop surfaces lying against the end of the sliding arm 41.
- the sliding arm portion 41 hereby need have no further provisions for fixing of the extension piece 44 and is very simply manufactured by sawing a suitable piece from a profile length. As can be seen in fig. 3, the front and rear ends slant at the same angle so that one saw-cut can suffice per sliding arm portion 41.
- the extension piece can be embodied for instance as capping piece as well as extension piece as shown.
- the screw body can take a multiple, for instance double, form, so that it is telescopically unscrewable and enables a greater height adjustment.
- a reinforcement of for instance perforated sheet steel can be taken up. In case of possible molding faults this reinforcement keeps the extension piece together when breakage might occur, so that in that case nevertheless a sufficiency safety is guaranteed.
- the lifting device according to the invention therefore has a number of advantages. These advantages include a greater safety during use, simpler assembly and lower manufacturing costs.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
- Chain Conveyers (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Jib Cranes (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
Description
- The invention relates to a vehicle lifting device comprising at least one column, with a vertically movable carriage to which bearing arms for supporting a vehicle are connected and drive means for moving the carriage upward, wherein at least one of the bearing arms of the carriage comprises a base arm pivotally connected to the carriage and having a telescopically extending arm portion which comprises on its free end a carrier formed by a horizontal bearing platform with a downward protruding screw body received in a screw-threaded hole of the arm portion.
- Such lifting devices are generally known. These can be embodied as a one- or two-column lifting device having fixed columns placed at the sides or as a jack lifter with one telescopically extending column. The movement possibilities of the bearing arms, namely pivoting, sliding out and the possibility of screwing the carrier up or downward, are required in order to accurately position the bearing platform of the carrier in a desired position under a support of the vehicle for lifting. When the carriers of all bearing arms are correctly positioned the lifting device can be set into operation and the vehicle safely lifted.
- In the known two-column lifting device the extending arm portion is a steel rod. Arranged in the end of this rod is the threaded hole into which engages the screw body of the carrier. The bottom end of the screw body here protrudes beyond the hole on the underside.
- This protruding screw body portion forms a safety risk. In the raised situation of the lifting device it is located at the head height of persons working beneath the raised vehicle. They can easily collide with the screw body with all the danger of head injuries that this implies.
- The invention has for its object to provide a vehicle lifting device of the type described in the preamble which does not have this drawback and is therefore safer to use.
- In a vehicle lifting device according to the invention this is achieved in that the extending arm portion comprises on its free end a mould-formed extension piece in which the threaded hole receiving the carrier is formed and which comprises a protective cap extending downward around the elongation of the threaded hole and enclosing the bottom end of the screw body. Direct contact with the screw body of the carrier is prevented by the protective cap. As a result of the mould-formed extension piece it is possible in economic manner to use large rounded radii at the location of the end of the bearing arm, whereby the danger of injury through collision is obviated or at least very greatly limited.
- A favourable embodiment is characterized in
claim 2. The mould required for manufacturing the extension piece can hereby be embodied more simply and thus more cheaply, while the bottom end of the screw body is moreover accessible when the cover is removed, which is favourable for assembly, and particularly for arranging of a locking ring thereon. The cover is preferably made of a soft plastic. - According to a very favourable further development of the invention the extension piece is manufactured from a high-grade plastic. It has been found that in a design with a relatively large volume, which to obtain the above mentioned large rounded radii is already per se desirable, it is possible to fulfil all strength requirements with modern high-grade plastics. The advantage of using plastic is of course a comparatively low cost price of the mould-formed extension piece. The use of plastic moreover allows a great freedom of design, whereby an attractive finish and a robust appearance of the bearing arms can be obtained.
- The application of claim 4 is favourable here.
- It has been found that a very suitable plastic is a polyamide or polyarylamide with glass fibre filling. These materials have properties suitable for the intended application.
- According to a further development of the lifting device according to the invention the extending arm portion is a hollow profile and the extension piece comprises a connecting protrusion fitting into the hollow profile. The extending arm portion can simply be sawn from a greater length and is therefore relatively inexpensive. The means necessary to obtain a good fixing of the extension piece to the hollow profile can be realized in simple manner on account of the great freedom in the design of the extension piece.
- A favourable further development is characterized in
claim 8. The mounting of the extension piece on the extending arm portion is hereby very simple. If during use an extension piece with carrier becomes damaged, for instance because a vehicle is driven against it, the damaged extension piece can be very simply replaced by a new one. - When use is made of a high-grade plastic the step of claim 9 is preferably applied. The large diameter of the screw thread contributes to the robustness of the construction and, when a pitch of the trapezium screw thread is selected that is normal at the said diameter, the advantage is furthermore achieved that a considerable height adjustment of the carrier is already obtained with a limited rotation, so that setting of the carrier to the desired height can take place very rapidly.
- The invention is further elucidated in the following description with reference to the embodiment shown in the figures.
- Fig. 1 shows a partially broken away perspective view of an embodiment of a vehicle lifting device according to the invention.
- Fig. 2 shows on a larger scale a partially broken away view according to arrow II in fig. 1.
- Fig. 3 shows on a larger scale a partially broken away view according to arrow III in fig. 1.
- Fig. 4 shows a section according to IV-IV in fig. 3.
- The vehicle lifting device 1 according to the invention shown in fig. 1 comprises two
hollow columns 2 of sturdy steel plate, which have a substantially C-profile as shown particularly in fig. 2. Eachcolumn 2 thus has a channel 4 on one side. - Each
column 2 is fixedly welded onto abase plate 11 which is anchored in theground using bolts 12. - Received into each
hollow column 2 is a verticallymovable carriage 3 which is provided at its bottom end and top end withguide wheels 5 and 6 respectively. The basic body of thecarriage 3 consists of a U-profile. The construction is such that the body of the U-profile of thecarriage 3 lies in the channel 4 of thecolumn 2 such that it lies in one plane with the profile parts of thecolumn 2 adjoining the channel 4. - On the bottom end each
carriage 3 bears asupport construction 7 which protrudes outside thecolumn 2 and to which two bearingarms 8 are pivotally mounted. Integrated into theswivel bearings 10 is an arresting mechanism which can lock therelevant arm 8 in a chosen swivel position. Situated on the end of an extending portion of eacharm 8 further shown in fig. 3 is a carrier 9, the top surface of which can grip a support on the bottom of a vehicle for raising. To lift a vehicle thearms 8 are swivelled into such a position and extended so far until all four carriers 9 of the lifting device 1 are situated under a relevant support of the vehicle so that the vehicle can be lifted by the simultaneous movement of the twocarriages 3 in bothcolumns 2. - For synchronous upward movement of the
carriages 3 the lifting device 1 is provided with drive means. In the embodiment shown these drive means comprise a hydraulic jack 14 mounted in the left-hand column 2 in fig. 1. Thecylinder 15 of this jack 14 is fixedly connected to thecarriage 3 and thepiston rod 16 is fixedly connected at its top end to thecolumn 2. Thepiston rod 16 has a central bore 36 to the outer end of which is connected ahydraulic oil feed 17. For lifting, hydraulic oil under pressure is pressed via thefeed 17 and the bore 36 above the piston into the cylinder 14 whereby the cylinder 14 and therefore thecarriage 3 are moved upward. - For synchronous driving of the
carriage 3 in the right-hand column 2 in fig. 1 a chain transmission is arranged. This chain transmission comprises achain 19 which is fixedly mounted on asupport 18 forming an entity with thecarriage 3. Thechain 19 extends downward from thissupport 18 and runs around achain wheel 20 that is rotatable about a shaft fixedly connected to thecolumn 2. - From the
chain wheel 20 the chain extends upward via achain wheel 21 at the top of the left-hand column 2 through across beam 13 mutually joining bothcolumns 2 at their top ends, over achain wheel 22 at the top of the right-hand column 2 to the right-hand carriage 3. The end of thechain 19 is fixedly connected to thecarriage 3 by means of asafety construction 23 not further shown in fig. 2. Thissafety construction 23 is embodied such that if thechain 19 should break therod 24 mounted fixedly in thecolumn 2 is gripped immediately, thus preventing the right-hand carriage 3 from falling downward. - Integrated into the left-hand column is a safety device which, during normal use, also prevents undesired downward movement of the
carriages 3, for example as a result of a leakage in the hydraulic jack 14. This safety device comprises ahole strip 27 mounted fixedly in the left-hand column with which aratchet 28 co-acts that is connected pivotally to the left-hand carriage 3 by means of ashaft 29. Theratchet 28 is embodied such that it allows an upward movement but in the case of downward movement grips into a hole in thehole strip 27. To be disengaged from thehole strip 27 theratchet 28 can be rotated round theshaft 29 in counter-clockwise direction as seen in fig. 2 by anelectromagnet 30. Thiselectromagnet 30 is activated when the control device, which is not described further here, receives a command to lower the lifting device. - The described chain transmission ensures that both
carriages 3 run synchronously unless, as described, the chain breaks. The right-hand carriage 3 is then instantaneously locked on therod 24. Chain breakage is moreover detected by a switch means, not further described here, and this switch means generates a signal to the control device whereby the lifting or lowering movement is immediately ended. Thus is prevented that an automobile resting on the bearing arms comes to hang at an unacceptable slant and possibly falls from the arms. - The mentioned switch means likewise detects when the
chain 19 becomes slack. This can occur when during lowering the right-hand carriage is obstructed by a support or the like accidentally left behind under the device. The lowering movement will in this case also be switched off immediately. These safety devices are otherwise generally per se known. Another per se known safety device is asensor wire 37 arranged directly beneath thecross beam 13 which activates a switch as soon as thewire 37 is pressed upward, for example by the roof of a vehicle. To prevent damage through contact with thecross beam 13 the lifting movement is then immediately switched off. - As can be seen in more detail in fig. 3, the
bearing arm 8 comprises ahollow base arm 40 pivotally connected to thesupport 7 of the carriage and a telescopically extendingarm portion 41. The extendingarm portion 41 bears on its end towards the carriage astop 42 which can co-act with astop 43 against the top face of thehollow base arm 40 in order to prevent the slidingpart 41 being pushed too far outward. During assembly of thebearing arm 8 the slidingportion 41 is pushed into thebase arm 40 from the left as seen in fig. 3 before the carryingconstruction 10 is mounted. - Arranged on the free end of the sliding
arm portion 41 is a mould-formedextension piece 44. Thisextension piece 44 has a connectingprotrusion 45 which can be pushed into the slidingportion 41. - As shown in more detail in fig. 4, a threaded
hole 49 is formed in theextension piece 44 into which engages thescrew body 48 of a carrier 9. This carrier 9 comprises in addition to the screw body 48 abearing platform 46 provided with a covering 47 of rubbery material such as soft polyurethane. As noted above, the bearingplatform 46 is positioned under a support on the bottom of the vehicle in order to lift up the vehicle. The bearingplatform 46 can be herein adjusted to a suitable height by rotating the carrier 9. - At its bottom end the
screw body 48 of carrier 9 has a lockingspring 50 which prevents it being possible to entirely unscrew the carrier 9 from the threadedhole 49. - The
extension piece 44 comprises a protective cap extending downward around the elongation of the threadedhole 49. This protective cap is formed by asleeve 51 forming an entity with theextension piece 44 and a cover pushed thereon at the bottom end. The protective cap formed by thesleeve 51 and thecover 52 encloses the bottom end of thescrew body 48 so that a user cannot collide with it. - Because the
extension piece 44 is mould-formed there is a large degree of freedom of design. It is hereby possible in particular to employ large rounded radii in economic manner whereby the danger of injury through collision is greatly limited or even eliminated. Thecover 52 can, if desired, be manufactured from a soft plastic, likewise to eliminate the danger of injury through collision. - The
extension piece 44 as well as the carrier 9 are formed in this embodiment in a mould from a polyamide or polyarylamide with glass fibre filling. Through the use of this high-grade plastic theextension piece 44 and the carrier 9 obtain mechanical properties as desired for the intended application. - As shown in fig. 4 the
screw body 48 of carrier 9 has a large diameter. In preference a diameter in the order of magnitude of 50 mm is used. Use of a trapezium screw thread with a corresponding pitch, for instance in the order of magnitude of 8 mm, achieves a robust and stable construction. The large diameter with correspondingly large pitch of the screw thread moreover has the consequence that a considerable height change of the bearingplatform 46 already occurs with only a small rotation of the carrier 9. The carrier 9 can hereby be set very rapidly to the desired height. - The
extension piece 44 is mounted in the slidingarm portion 41 by means of a snap-in connection. Thefastening protrusion 45 comprises in its lower wall alip 55 which carries a chamferedcam 53. Ahole 54 is formed in the slidingarm portion 41. When thefastening protrusion 45 is pushed into thearm portion 41 thecam 53 can slide over the inner surface of the arm portion until thecam 53 converges with thehole 54. Thecam 53 then falls into the hole, whereby theextension piece 44 is locked. Replacing anextension piece 44 can also be carried out very rapidly in this manner. By pressing thecam 53 upward using a pin-like member it can be released from thehole 54, whereafter theextension piece 44 can be moved out of the slidingarm portion 41. Areplacement extension piece 44 can once again be arranged very quickly in the manner described. - As noted earlier, the freedom of design is very considerable because the extension piece is mould-formed. As can be seen in the figures, a robust and attractive appearance is already obtained owing to the large rounded radii used, particularly the large diameter of the
sleeve 51, and owing to the large diameter of thescrew body 48. In the embodiment shownribs 56 are arranged on the side faces of the extension piece which serve on the one hand as embellishment while the end faces of which moreover serve as stop surfaces lying against the end of the slidingarm 41. The slidingarm portion 41 hereby need have no further provisions for fixing of theextension piece 44 and is very simply manufactured by sawing a suitable piece from a profile length. As can be seen in fig. 3, the front and rear ends slant at the same angle so that one saw-cut can suffice per slidingarm portion 41. - Many embodiment variants are possible. The extension piece can be embodied for instance as capping piece as well as extension piece as shown. The screw body can take a multiple, for instance double, form, so that it is telescopically unscrewable and enables a greater height adjustment.
- In the material of the extension piece a reinforcement of for instance perforated sheet steel can be taken up. In case of possible molding faults this reinforcement keeps the extension piece together when breakage might occur, so that in that case nevertheless a sufficiency safety is guaranteed.
- The lifting device according to the invention therefore has a number of advantages. These advantages include a greater safety during use, simpler assembly and lower manufacturing costs.
Claims (9)
- Vehicle lifting device comprising at least one column, with a vertically movable carriage to which bearing arms for supporting a vehicle are connected and drive means for moving the carriage upward, wherein at least one of the bearing arms of the carriage comprises a base arm pivotally connected to the carriage and having a telescopically extending arm portion which comprises on its free end a carrier formed by a horizontal bearing platform with a downward protruding screw body received in a screw-threaded hole of the arm portion, characterized in that the extending arm portion comprises on its free end a mould-formed extension piece in which the threaded hole receiving the carrier is formed and which comprises a protective cap extending downward around the elongation of the threaded hole and enclosing the bottom end of the screw body.
- Lifting device as claimed in claim 1, characterized in that the protective cap is formed by a sleeve forming part of the extension piece and a cover arranged on the bottom end of the sleeve.
- Lifting device as claimed in claim 2, characterized in that the cover is manufactured from a soft plastic.
- Lifting device as claimed in any of the foregoing claims, characterized in that the extension piece is manufactured from a high-grade plastic.
- Lifting device as claimed in any of the foregoing claims, characterized in that the carrier is manufactured from a high-grade plastic and the bearing platform comprises a covering of rubbery material.
- Lifting device as claimed in claim 4 or 5, characterized in that the high-grade plastic is a polyamide or polyarylamide with glass fibre filling.
- Lifting device as claimed in any of the foregoing claims, characterized in that the extending arm portion is a hollow profile and the extension piece comprises a connecting protrusion fitting into the hollow profile.
- Lifting device as claimed in claim 7, characterized in that the connecting protrusion is locked into the hollow profile with a snap-in connection, wherein the snap-in connection comprises a resilient lip with a protruding cam on the connecting protrusion and a hole in the hollow profile accessible from outside for receiving the cam.
- Lifting device as claimed in any of the claims 4-8, characterized in that the screw body and the threaded hole are provided with a trapezium screw thread with an effective diameter in the order of magnitude of 50 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9001900A NL9001900A (en) | 1990-08-29 | 1990-08-29 | CARRIER FOR A CAR LIFT. |
NL9001900 | 1990-08-29 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0473238A2 EP0473238A2 (en) | 1992-03-04 |
EP0473238A3 EP0473238A3 (en) | 1992-03-25 |
EP0473238B1 true EP0473238B1 (en) | 1995-03-01 |
Family
ID=19857597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91202201A Expired - Lifetime EP0473238B1 (en) | 1990-08-29 | 1991-08-29 | Carrier for a vehicle lifting device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0473238B1 (en) |
AT (1) | ATE119132T1 (en) |
DE (1) | DE69107734T2 (en) |
ES (1) | ES2068487T3 (en) |
NL (1) | NL9001900A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016123383A1 (en) * | 2016-12-02 | 2018-06-07 | Johannes Baringer | LIFTING DEVICE |
CN109502505A (en) * | 2017-12-15 | 2019-03-22 | 蔚来汽车有限公司 | Car lift structure and move electric system certainly |
DE102020105446A1 (en) | 2020-03-02 | 2021-09-02 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Adapter for a lifting platform |
DE102022204477A1 (en) | 2022-05-06 | 2023-11-09 | Maha Maschinenbau Haldenwang Gmbh & Co. Kg | Pick-up device for picking up a vehicle and lifting device |
CN115818498B (en) * | 2022-11-24 | 2023-09-05 | 苏州艾沃意特汽车设备有限公司 | Asymmetric double-upright lifter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2070516A5 (en) * | 1969-12-08 | 1971-09-10 | Fogautolube Sa | |
DE2046460A1 (en) * | 1970-09-21 | 1972-04-13 | Maschinenfabrik J.A. Becker & Söhne Neckarsulm, 7101 Erlenbach | Adjustable support plate on telescopic swivel arms of all kinds of lifting platforms |
GB1403074A (en) * | 1972-11-29 | 1975-08-13 | Gkn Transmissions Ltd | Lifting apparatus |
EP0309538A1 (en) * | 1987-04-02 | 1989-04-05 | LEE, Man Ho | Lift |
-
1990
- 1990-08-29 NL NL9001900A patent/NL9001900A/en not_active Application Discontinuation
-
1991
- 1991-08-29 EP EP91202201A patent/EP0473238B1/en not_active Expired - Lifetime
- 1991-08-29 AT AT91202201T patent/ATE119132T1/en not_active IP Right Cessation
- 1991-08-29 ES ES91202201T patent/ES2068487T3/en not_active Expired - Lifetime
- 1991-08-29 DE DE69107734T patent/DE69107734T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE119132T1 (en) | 1995-03-15 |
NL9001900A (en) | 1992-03-16 |
ES2068487T3 (en) | 1995-04-16 |
EP0473238A3 (en) | 1992-03-25 |
EP0473238A2 (en) | 1992-03-04 |
DE69107734T2 (en) | 1995-06-29 |
DE69107734D1 (en) | 1995-04-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6422285B1 (en) | Tire changing machine for industrial vehicle wheels | |
US6886619B2 (en) | Tire assembling-release machine | |
KR101903023B1 (en) | Limit switch apparatus for aerial work substitute with omnidirectional impact sensing | |
KR101844195B1 (en) | Sheet metal bending device | |
EP0752947B1 (en) | Isolated floor for material handling vehicle | |
US20020136620A1 (en) | Vehicle blocking device | |
EP0473238B1 (en) | Carrier for a vehicle lifting device | |
CN101384195A (en) | Mechanism for a chair | |
US4815711A (en) | Hydraulic leveling apparatus for recreational vehicle & the like | |
WO1991012060A1 (en) | Hurdle boom holder | |
JP3504274B2 (en) | Traveling and rotating equipment for car reception | |
DK1407912T4 (en) | Body for commercial vehicles | |
EP0478035B1 (en) | Bearing arm arresting for a vehicle lifting device | |
US5613575A (en) | Flat-structure lifting platform | |
US4759173A (en) | Self-propelling agricultural machine | |
US5746291A (en) | Floor conveyor vehicle | |
US5377782A (en) | Swing arm short-rise vehicle lift | |
CN109484829B (en) | Workpiece steering device | |
EP0473239B1 (en) | Vehicle lifting device | |
CN113423660A (en) | Safety switching arrangement with tensioning element | |
GB2274828A (en) | Lift truck comprising supporting elements | |
EP0795459A1 (en) | Levelling suspension device for a truck cab | |
US5002256A (en) | Lifting and supporting device | |
CZ161496A3 (en) | Vehicle jack | |
CN2448812Y (en) | Cable breaking proof safety device for common planer frame |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19920811 |
|
17Q | First examination report despatched |
Effective date: 19940425 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 19950301 Ref country code: LI Effective date: 19950301 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19950301 Ref country code: FR Effective date: 19950301 Ref country code: AT Effective date: 19950301 Ref country code: BE Effective date: 19950301 Ref country code: DK Effective date: 19950301 Ref country code: CH Effective date: 19950301 |
|
REF | Corresponds to: |
Ref document number: 119132 Country of ref document: AT Date of ref document: 19950315 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 69107734 Country of ref document: DE Date of ref document: 19950406 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2068487 Country of ref document: ES Kind code of ref document: T3 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19950601 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
EN | Fr: translation not filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19950831 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20000229 Year of fee payment: 9 Ref country code: ES Payment date: 20000229 Year of fee payment: 9 Ref country code: NL Payment date: 20000229 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000830 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010301 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20010301 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010501 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20020731 Year of fee payment: 12 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030829 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20010911 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |