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CA2287113A1 - Improved open-end, four-post vehicle lift - Google Patents

Improved open-end, four-post vehicle lift Download PDF

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Publication number
CA2287113A1
CA2287113A1 CA 2287113 CA2287113A CA2287113A1 CA 2287113 A1 CA2287113 A1 CA 2287113A1 CA 2287113 CA2287113 CA 2287113 CA 2287113 A CA2287113 A CA 2287113A CA 2287113 A1 CA2287113 A1 CA 2287113A1
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CA
Canada
Prior art keywords
vehicle
post
bearing
posts
cantilever
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.)
Abandoned
Application number
CA 2287113
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French (fr)
Inventor
Harold Yeo
Michael Bruyns
Jack Nobre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wheeltronic Ltd
Original Assignee
Wheeltronic Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wheeltronic Ltd filed Critical Wheeltronic Ltd
Publication of CA2287113A1 publication Critical patent/CA2287113A1/en
Abandoned legal-status Critical Current

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Abstract

A lift assembly for a vehicle comprising at least two spaced posts; a pair of longitudinally extending vehicle runway tracks adapted to contact vehicle wheels of a vehicle to be supported thereon; a pair of first and second cantilever members connected with one of said runway tracks respectively and having an end in sliding engagement with one of said posts;
a bearing surface presented by said cantilever members in sliding contact with said post.

Description

Attorney Docket No. 4201-17 APPLICATION FOR CANADIAN LETTERS PATENT
INVENTORS: HAROLD YEO, MICHAEL BRUYNS & JACK NOBRE
ASSIGNEE: WHEELTRONIC LTD.
TITLE: IMPROVED OPEN-END, FOUR-POST VEHICLE LIFT

Description IMPROVED OPEN-END, FOUR POST VEHICLE LIFT
Field of Invention This invention relates generally to automotive vehicle lifts and, more particulary, to an open-end, four-post vertical column lift.
Background Art Hydraulic vehicle lifts are available in a variety of forms including two-post, four-post, cassette-style, scissor lift and portable. Four-post lifts have four vertical columns that are aligned to guide and support a generally flat, rectangular vehicle-support frame formed by longitudinally extending runways or tracks and horizontally extending cross-members joining the runways at front and rear ends. The vehicle-support frame in typical four-post lifts has rollers that are mounted in vertical tracks along each of the posts to enable level, vertical translation of the vehicle-support frame therein.
Four-post lifts, when compared to other types of lifts, are relatively versatile and efficient because they can handle a wide variety of weight and size capacities. Since four-post lifts distribute load to all four posts they can be designed to make efficient use of materials. Because of the stability in four-post lifts that is attributable, in part, to the flat rectangular structure formed by the runways and cross members, it is not generally necessary to join the top ends of the posts to each other as with two-post lifts.
Moreover, there is little potential for excessive moment forces being applied at the juncture of each post and a cross-member of the rectangular vehicle-support frame, since each member extends between two adjacent posts.
It is desirable, however, to provide four-posts lifts having an open end such that the vehicle-support frame will form an open or "C" shape. In such lifts, two shorter members extending from opposite posts on either side of the front or the rear of the lift, but not joined in the middle, replace one cross-member. In this fashion an individual may freely walk between the runways by access from the front or rear of the lift where said vehicle-support frame forms said open or "C" shape clearance gap. Open-end lifts provide convenient and sometimes necessary access and additional space to accommodate particular operations.
Open-end four-post lifts, typically having the open end at the two front posts, require sufficient structure and design to accommodate added moment forces and concentrated stress points on roller tracks in the front posts, since lack of a front cross-member results in cantilevered, horizontally extending structures supporting the front end of each runway in the horizontal or cross-direction. Known open-end four-post lifts, such as the Rotary~ AR0122 lift, require cross-sectional post configurations and dimensions sufficient to handle the added moment and stress concentration forces. Such typical post construction in four-post lifts comprises cross-sections formed in a generally square "C" shape having thick, heavy-gauge steel bars of solid rectangular cross-section welded along the vertical length of each of the posts at the open edges of the "C" to serve as roller tracks. The steel bars are necessary to provide sufficient support for moment forces and for concentrated stress of the rollers. In open end lifts, the roller bearings, the roller contact surfaces, and the rollers themselves are subject to excessive wear associated with moving parts under heavy loads.
Thus, open-end four-post lift construction requires heavy materials and multiple assembly steps including welding the roller track bars along the open edges of the posts.
Disclosure of Invention It is an object of the present invention to provide an efficient, strong and versatile post lift that achieves or exceeds the performance of known post lifts and in particular to provide an efficient, strong and versatile open-end four-post lift that achieves or exceeds the performance of known four-post lifts but do not require the complex and costly construction of known lifts.
The present invention is directed to a lift having at least two posts made from a unitary, rolled piece of steel. The two posts have a cross-sectional shape or configuration that exhibit superior moment and bending resistance characteristics. Moreover said posts accommodate non-rolling, slide bearings having substantially larger surface contact area than conventional rollers in order to distribute stress concentrations over a larger area and having superior wear-life qualities in comparison to conventional rollers. Such features directly enhance performance in open-end lifts where front end moments and concentrated forces result from cantilever loading.
The posts of the present invention achieves the objectives of providing superior post and lift strength, superior stability and smoothness during movement of the vehicle-supporting surface, and reduction of stress concentration. In addition, the more simple, unitary construction requires more efficient manufacturing processes and less materials, minimizing costs and weight. These and other inherent advantages and objectives are apparent from the following detailed description and drawing illustrations.
Brief Description of Drawings Fig. lA illustrates a conventional prior art four-post lift.

Fig. 1B illustrates a conventional roller track.

Fig. 1C illustrates the cross-section of a post of Figure 1B.

Fig. 1D illustrates a partial cross-sectional view of Figs. 1B and 1C.

Fig. 2 illustrates one embodiment of the invention.

Fig. 3 is a top plan view of the invention.

Fig. 4 is a side elevational view of the cantilever member.

Fig. 5 is a side elevational view of the rear cross member.

Figs . 6A and 6B illustrate a post.

Fig. 7 is a view of the cantilever post.

Fig. 8 is an end view of the cantilever member.

Fig. 9 is a top perspective view of the post.

Fig. 10 is an end view of the bearing member.

Fig. 11A is a top plan view of one end of the bearing member.

Fig. 11B is a top plan view of another end of the bearing member.

Fig. 12 is a is a hydraulics and air kit assembly.

Fig. 13 is a cable routing diagram.

Fig. 14 is a lift assembly drawing.
Best Mode for Caring Out the Invention In the description which follows, like parts are marked throughout the specification and the drawings with the same respective reference numerals. The drawings are not necessarily to scale and in some instances proportions may have been exaggerated in order to more clearly depict certain features of the invention.
An open-end, four-post lift 10 of the conventional type is shown in Fig. lA.
The lift has two front posts 12, 14 and two rear posts 16, 18. A vertically slidable rear cross-member 20 extends horizontally between the two rear posts 16, 18 and is mounted in slidable 10 contact with each rear post 16, 18. A slidably mounted cantilever member 22, 24 extends from each of the front posts 12, 14 toward the opposite post, providing a clearance gap between the distal ends 26, 28 of each cantilever member 22, 24. A pair of longitudinally extending runway tracks 30, 32 adapted to support a vehicle 34 thereon are joined at front and rear ends by the cantilever members 22, 24 at the front end and the rear cross-member 20. The runway tracks 30, 32 are adapted to accommodate and support a vehicle 34 and to move vertically up and down so that the vehicle 34 can be driven from the ground level unto runways 30, 32. In Fig. lA, the lift 10 is shown with the runway tracks 30, 32 in a partially raised position. Rear end ramps 31, 33 are pivotally secured to the runways 30, 32 so that they pivot when the lift 10 is in the raised position in order to serve as rear wheel chocks.
In the lowered position the rear end ways contact the ground and pivot outwardly away from the vehicle so as to assume a more horizontal position permitting the vehicle to be driven off the runway tracks 30, 32. The clearance gap or open end formed between the distal ends 26, 28 of the cantilever members 22, 24 provides a clearance for equipment and technicians.
The runway tracks 30, 32 and the cantilever members 22, 24 form a generally rectangular vehicle-support frame 36 that is attached to the posts 12, 14, 16, 18 by rollers mounted on respective ends, whereby the rollers fit into roller tracks in the posts 12, 14, 16, 18. As shown in Fig. lb, a roller 38 mounted to the outer end 40 of a cantilever member 24 is received in a roller track 42 formed by a longitudinal bar 44 and post 14 interior. The general cross-sectional shape of such a post 14 is shown in Fig. 1C, illustrating a centre 46, two sides 48 and two longitudinal bars 44. Each of the front posts 12 and 14 is in -S-similar roller contact with a roller mounted at the outer ends of the posts 12 and 14 and cantilever members 22, 24. Generally speaking the rear posts 16 and 18 do not use rollers as they do not require the cantilever support on the front posts since the rear posts use a crossbar 20. Optionally however the rear posts 16 and 18 can use rollers.
As shown by the arrow 52 in Fig. 1D, the point of contact between a roller 38 and a flat surface that it contacts, such as bar 44, comprises a relatively small area or line of contact. That area or line of contact is subject to high stress concentrations when, as shown in Fig. lA, moment forces in the direction of the arrow 54 caused by the load on the cantilever member 24 are transmitted to post 14. Typically, the end 40 of the cantilever member 24 extends vertically so that rollers 38a, 38b can be provided at vertically distant points 56, 58 as shown in Fig. 1D to distribute the load. The result is that the rollers 38a, 38b transmit resultant forces to their points or line of contact on the interior of the post 14 and the longitudinal bar 44. In other words each end 40 of the cantilever members 22 and 24 have a pair of vertically spaced rollers 38a and 38b, as well as a pair of horizontally spaced rollers 38a, 38a, and 38b, 38b. That is each end 40 of cantilever members 22 and 24 have four rollers 38a, 38a, 38b and 38b.
Moreover the rollers 38a, 38b are generally aligned vertically one above the other, such that the centre line of one roller 38a is in line vertically with the centre line of another roller 38b within the post 14.
Figure 2 illustrates one embodiment of the present invention in relation to an open-end, four-post lift 100. As illustrated in Figs. 2 and 3, the lift 100 comprises two front posts 102, 104, two rear posts 106, 108, and two runway tracks 111, 113 having pivoting rear end ramps 118, 120. The lift 100 further comprises a pair of cantilever members 110, 112 and rear cross-member 114, as shown in Fig. 3. A generally rectangular frame 116 formed by the runway tracks 110, 112, the rear cross-member 114 and the cantilever members 110, 112 is shown in the plan view of Fig. 3. The front, or open end 122, is formed between the inside ends 124, 126 of the cantilever members 110, 112.

The cantilever members 110, 112 of the preferred embodiment are shown in front view in Fig. 4. Each cantilever member 110, 112 has an inside end 124, 126, a vertically extending outside end 128, 130, and a top surface 132, 134. The top surface 132, 134 of each cantilever member 110, 112 is adapted to support a respective one of said runway tracks 111, 113.
The rear cross-member 114 is shown in front view in Fig. 5. The cross-member comprises outer ends 136, 138 and a top surface 140 adapted to support the runway tracks 111, 113.
The two front posts 102, 104, as shown in Fig. 3 and in Fig. 6, comprise unitary, roll-formed steel construction. The front posts 102, 104, in cross-section, comprise eleven separate straight sections 142-162 defining generally a t-shaped cross-section. This configuration defines channels 164, 166 between the sides indicated by numerals 144, 146, 148 and 156, 158, 160 respectively. The channels 164, 166 are adapted to slidingly receive and engage contact bearing members 168, 170, 172, 174 mounted on the outside end 128, 130 of the cantilever members 110, 112.
For purposes of the specific descriptions of components illustrated in Figs.
6A-11B, each of the two front posts 102, 104 has generally symmetrical construction and bearing arrangements. As such, the preferred embodiment is described with respect to only one side or front post 102, 104. This invention however is not limited thereby, and all four posts may have similar constructions, or a two post lift may incorporate the invention described herein.
As shown in Fig. 7, the respective bearing members 168, 170 of one cantilever member 110 are staggered with respect to the vertical direction. In other words, the bearing members do not line up vertically one above the other but are staggered in the horizontal direction. As shown in Fig. 8 and in Fig. 9, there are bearing members 168, 170 provided on each side, front 178 and rear 180, of a cantilever member 110. The inner side 176 of each inner-staggered bearing member 168 will contact the post surfaces indicated as numerals 144 and 160 in Fig. 6B. The outer side 178 of each outer-staggered bearing member 170 will contact the post surfaces indicated as numerals 148 and 156 in Fig. 6B.
The directions _7_ of contact force each respective bearing member 168, 170 are attributable to the direction of the moment forces of the load on the cantilever member 110, indicated by arrow 182 in Fig. 7, that is directed about a point that occurs between the bearing members 168, 170 at a location along the vertical direction, since the bearing members 168, 170 are spaced vertically. Therefore the traditional rollers shown in Figures 1C and 1D have been replaced by non-rolling slide bearings.
As shown in Fig. 9, bearing members 168, 170 are mounted on protruding bar ends 184, 186 that extend toward front and rear of a cantilever member 110. The bearing members 168, 170 are generally rectangular in front view, as shown in Figs. 10 and 11A.
As shown in Fig. 11B, the bearing members 168, 170 have a hollowed interior 169 adapted to fit into the bar ends 184, 186. The bearing contact surfaces 188, 189 comprise the entire rectangular surface area of their respective faces. Such bearing surfaces are significantly greater than the area of contact of a conventional roller bearing which area of contact is generally along a line of contact.
More specifically the bearing members 188, 189 illustrate a bearing contact surface which consists substantially of the entire rectangular surface area 176, 178 rather than a line of contact generally exhibited by rollers. Furthermore, as generally illustrated in Fig. 9, the area of contact comprises the longer rectangular face L rather than the shorter rectangular face s although the invention need not be limited thereby. Furthermore, the bearing members 168, 170 may be easily removed from the protruding bar ends 184, 186 respectively and rotated 180° so as to replace worn surfaces. In other words, through use if the inner side 176 of each of the inner-staggered bearing members 168 and outer side 178 of each outer-staggered bearing member 170 become worn such bearing members 168, 170 may be detached from the protruding bar ends 184, 186 and rotated so as to present the opposite unused side.
The bearing members 168-174 can be made of any suitable material that has sufficient strength and sliding wear resistance for the specific application. They can be configured in a variety of shapes that provide surface contact area preferably greater than that provided by _g_ a conventional roller. In the preferred embodiment, the bearing members 168-174 are made of polyethylene, or ultra molecular weight UHMW polyethylene.
The post described herein is preferably made from a unitary or single piece of material such as steel whereby a flat piece of steel is successively and progressively introduced through a set of dies whereby the flat sheet of steel is progressively bent through a series of steps so as to present a cross-section as illustrated in Fig. 6.
It is possible however that the invention described herein can comprise of a number of separate pieces of steel and welded together so as to present configurations shown in Fig. 6B
although the preferred embodiment comprises a unitary piece of material.
Moreover by providing a post having a cross-section as shown in Fig. 6 versus the prior art as shown in Fig. 2, a more rigid structure is presented.
Raising and lowering the generally rectangular frame 116 to raise and lower a vehicle mounted on the lift 100, is effected by actuating a hydraulic piston-cylinder assembly 188, shown in the hydraulic schematic illustration of Fig. 12. The piston-cylinder assembly 188 is connected to a set 190 of cables and pulleys 204, 206 as shown in Fig. 13.
A set of lift rack pulleys 9204 are fixed relative to the frame 116. A set of post pulleys 206 are secured to a corresponding one of the posts 102, 104, 106, 108 but adapted for relative vertical movement within each respective post. The piston-cylinder assembly 188 is controlled by means of a power pack 192 for controlling the introduction and release of pressurized fluid in the piston-cylinder assembly 188.
A cable connecting disc 192 is secured to the piston-cylinder assembly 188 and to four cable leads 194. The disc 192 is selectively moved to effect movement of the cable leads 194. Each end 196, 198, 200, 202 of the cable leads 194 is fixed relative to a respective post 102, 104, 106, 108 so that the cable leads 194 move toward the front posts 102, 104 the effective length of the cables decreases so that the pulleys 204, 206 are raised in the vertical direction. Since the lift rack pulleys 204 are fixed relative to the frame 116, the frame 116 is raised and maintained generally level. When the disc 192 is moved toward the rear posts 106, 108, the effective length of the cables increases so that the pulleys 204, 206 and frame 116 are lowered.
While the preferred embodiment of the present invention has been herein described and illustrated, various modifications to the preferred embodiment can be without departing from the scope of the presently claimed invention.

Claims (17)

1. A lift assembly for a vehicle comprising:
a) at least two spaced posts;
b) a pair of longitudinally extending vehicle runway tracks adapted to contact vehicle wheels of a vehicle to be supported thereon;
c) a pair of first and second cantilever members connected with one of said runway tracks respectively and having an end in sliding engagement with one of said posts;
d) a bearing surface presented by said cantilever members in sliding contact with said post.
2. An open-end, four post vehicle lift comprising:
a set of first and second front posts, each formed from a unitary piece of material;
a set of first and second rear posts;
a pair of longitudinally extending vehicle runway tracks adapted to contact vehicle wheels of a vehicle to be supported thereon;
a horizontally-extending rear cross-member in rigid connection with said runway tracks and having two ends, each end being in generally vertical sliding engagement with said rear posts;
a pair of first and second cantilever members each in rigid connection with one of said runway tracks and having an inside end and an outside end, whereby each outside end is in sliding engagement with one of said front posts, and each cantilever member extends horizontally toward the other of said cantilever members; and a gap formed between said respective inside ends.
3. A vehicle lift according to claim 2, further comprising:
bearing means present on the outside end of each cantilever member to facilitate said sliding engagement; and at least a pair of generally vertically-extending bearing tracks formed on each of said front posts adapted to engage said bearing means.
4. A vehicle lift according to claim 3, wherein said bearing means comprise at least one bearing member having a generally flat bearing contact surface.
5. A vehicle lift according to claim 3, wherein said bearing means comprise a pair of bearing members each having a generally flat bearing contact surface.
6. A vehicle lift according to claim 5, wherein said bearing members are non-metal.
7. A vehicle lift according to claim 5, wherein said bearing members are made from polyethylene.
8. A vehicle lift according to claim 5, wherein said bearing members on each of said cantilever members are spaced vertically with respect to each other.
9. A vehicle lift according to claim 8, wherein said bearing members on one of said cantilever members are horizontally offset with respect to each other.
10. A vehicle lift according to claim 9, wherein each said bearing member on one of said cantilever members are adapted to contact a different surface of said generally vertically-extending bearing tracks formed on each of said front posts.
11. A vehicle lift as claimed in claim 2, wherein each front post is made from a unitary piece of roll-formed steel.
12. A vehicle lift according to claim 2, wherein each front post has, in cross-section, eleven distinct straight walls.
13. A vehicle lift according to claim 2, further comprising:
a hydraulic system having a piston-cylinder assembly;

control means for selectively actuating said piston-cylinder assembly; and a set of cables and pulleys in physical connection with said piston-cylinder, such that said piston-cylinder assembly and said set of cables and pulleys can be selectively actuated to raise and lower a vehicle-supporting structure defined by said runway tracks, said rear cross-member, and said pair of first and second cantilever members.
14. A post for use in a four-post vehicle lift, said post comprising of a unitary piece of roll-formed steel.
15. A post for use in a four-post vehicle lift according to claim 14, wherein said post, in cross-section, has eleven distinct straight walls.
16. An improved open-end, four post vehicle lift of the type comprising:
a) a set of first and second front posts, each formed from a unitary piece of material;
b) a set of first and second rear posts;
c) a pair of longitudinally-extending vehicle runway tracks adapted to contact vehicle wheels of a vehicle to be supported thereon;
d) a horizontally-extending rear cross-member in rigid connection with said runway tracks and having two ends, each end being in generally vertical sliding engagement with one of said rear posts;
e) a pair of first and second cantilever members each in rigid connection with one of said runway tracks and having an inside end and an outside end, whereby each outside end is in sliding engagement with one of said front posts, and each cantilever member extends horizontally toward the other of said cantilever members;
f) a gap formed between said respective inside ends;
g) bearing means present on the outside end of each cantilever member to facilitate said sliding engagement; and h) at least a pair of generally vertically-extending bearing tracks formed on each of said front posts adapted to engage said bearing means.
17. A vehicle lift according to claim 16, further comprising:
a hydraulic system having a piston-cylinder assembly;
control means for selectively actuating said piston-cylinder assembly; and a set of cables and pulleys in physical connection with said piston-cylinder, such that said piston-cylinder assembly and said set of cables and pulleys can be selectively actuated to raise and lower a vehicle-supporting structure defined by said runway tracks, said rear cross-member, and said pair of first and second cantilever members.
CA 2287113 1998-10-23 1999-10-22 Improved open-end, four-post vehicle lift Abandoned CA2287113A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10543698P 1998-10-23 1998-10-23
US60/105,436 1998-10-23

Publications (1)

Publication Number Publication Date
CA2287113A1 true CA2287113A1 (en) 2000-04-23

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ID=31713931

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2287113 Abandoned CA2287113A1 (en) 1998-10-23 1999-10-22 Improved open-end, four-post vehicle lift

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102390792A (en) * 2011-11-18 2012-03-28 常熟通润汽车零部件股份有限公司 Automobile lifter with slipway wear compensation device
EP3757057A1 (en) * 2019-06-25 2020-12-30 MAHA Maschinenbau Haldenwang GmbH & Co. KG Lifting platform and support column of a lifting platform

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102390792A (en) * 2011-11-18 2012-03-28 常熟通润汽车零部件股份有限公司 Automobile lifter with slipway wear compensation device
CN102390792B (en) * 2011-11-18 2013-09-25 常熟通润汽车零部件股份有限公司 Automobile lifter with slipway wear compensation device
EP3757057A1 (en) * 2019-06-25 2020-12-30 MAHA Maschinenbau Haldenwang GmbH & Co. KG Lifting platform and support column of a lifting platform

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