GB2140385A - Cable drive device for displacing a platform of a vehicle load lifting apparatus - Google Patents
Cable drive device for displacing a platform of a vehicle load lifting apparatus Download PDFInfo
- Publication number
- GB2140385A GB2140385A GB08314212A GB8314212A GB2140385A GB 2140385 A GB2140385 A GB 2140385A GB 08314212 A GB08314212 A GB 08314212A GB 8314212 A GB8314212 A GB 8314212A GB 2140385 A GB2140385 A GB 2140385A
- Authority
- GB
- United Kingdom
- Prior art keywords
- beam member
- cable
- platform
- piston
- cylinder
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
- B60P1/44—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading having a loading platform thereon raising the load to the level of the load-transporting element
- B60P1/4414—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading having a loading platform thereon raising the load to the level of the load-transporting element and keeping the loading platform parallel to the ground when raising the load
- B60P1/4421—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading having a loading platform thereon raising the load to the level of the load-transporting element and keeping the loading platform parallel to the ground when raising the load the loading platform being carried in at least one vertical guide
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
A cable drive device is provided for a platform of a vehicle load lifting apparatus. The device includes a hollow beam member (1) extending horizontally above a vehicle rear opening, two cables (2a, 2b) attachable at one end (5a, 5b) to the platform and attachable at the other end (6a, 6b) to the beam member (1), at least three rotatable pulleys mounted in the beam member (1) two (7a, 7b) at or towards one end of the beam member (1) and the other (8) with one end of an assembly (3) carrying a further two rotatable pulleys (11a, 11b) and with the other end of the assembly (3) being adjustably fixed on the beam member (1) at different spaced locations therealong, the cables (2a, 2b) being locatable such that when the device is operatively associated with a vehicle load lifting apparatus, the arrangement is such that a movement of the connection of the the end of the piston and cylinder assembly (3) by a distance X along the length of the beam member (1) in one or the opposite direction results in an effective lengthening or shortening of each cable (2a, 2b) by an amount of 2X. <IMAGE>
Description
SPECIFICATION
Cable drive device for displacing a platform of a vehicle load lifting apparatus
This invention relates to a cable drive device for displacing a platform of a vehicle load
lifting apparatus and concerns, particularly but
not exclusively, such a device which has
means permitting the use of a variety of different lengths of cable and/or the ready adjustment of the length of the cable utilized.
A vehicle load lifting apparatus usually includes a platform slidably mounted at one end in a pair of spaced apart substantially vertically extending guide channels and movable up and down in the channels by means of electric motor or hydraulic ram operated cables housed in the channels.
The platform guide channels may be mounted one on either side of a rear opening of the vehicle in the case of a tail lift, and the platform, which can be pivoted between substantially vertical and horizontal positions, may be moved between a vertical raised stowed position in which it closes at least partially the vehicle rear opening at or above the vehicle opening floor level, a horizontal pivoted out raised working position in which it lies at the level of the vehicle opening floor and horizontal pivoted out low working position in which it lies substantially at ground level. Such vehicle load lifting apparatus or "tail lifts" are usually made in a limited range of standard sizes for adaptation and mounting by vehicle body manufacturers to fit a wide range of vehicles.Generally the tail lift platform is moved vertically by two wire cables displaced over pulleys by an hydraulic ram, with the ram and pulleys being located in a beam member located above the vehicle tail apertures. The cables are attached at one end to the tail lift platform and at the other end are passed over pulleys in the beam member and anchored to the member. As the height of the vehicle tail aperture may vary markedly from vehicle body to vehicle body it is customary to supply from a range of standard length cables with a tail lift kit to enable the body manufacturer to have the correct length for the particular vehicle body tail aperture height. This procedure requires the body manufacturer or servicing agent to keep in stock a range of standard length cables for spares with the increased cost thereby occasioned.
Provision has conventionally been made with such tail lift kits for minor lengthening or shortening of the cables by making the cables screwably adjustable at their anchorage points on the beam member. Whilst this does afford a means of adjustment for minor length variation requirements such as to take up stretch in the cables or compensate for spring settling of the vehicle, it only provides a very limited amount of length adjustment and still requires the provision of a wide range of standard length cables.
There is thus a need for a cable drive device for a vehicle load lifting apparatus which provides for and allows the cable to be varied in length considerably more than is conventionally possible and thus reduce the range of standard cable lengths required to be stocked by the vehicle body manufacturer or fitter installing the tail lift.
According to the present invention there is provided a cable drive device for displacing a platform of a vehicle load lifting apparatus, which device includes a hollow beam member locatable to extend horizontally above a ve hicle rear opening, two cables attachable at one end directly or indirectly to the platform of a vehicle load lifting apparatus and attachable at the other end to the beam member, at least three rotatable pulleys mounted in the beam member two at or towards one end of the beam member and the other at or towards the other end of the beam member, and a fluid pressure operable piston and cylinder assembly located in the beam member between said two and said other rotatable pulleys with one end of the assembly carrying a further two rotatable pulleys and with the other end of the assembly being adjustably fixedly connectable to the beam member at different spaced locations therealong, the cables being locatable such that when the device is operatively associated with a vehicle load lifting apparatus, one cable passes up from the platform, over one of the said two of the three rotatable pulleys, along the beam member interior, around one of the said two further rotatable pulleys and back along the beam member interior to an anchorage point on the beam member, and the other cable passes up from the platform, over the other of the said three rotatable pulleys along the beam member interior, around the other of the said two of the said three rotatable pulleys, back along the beam member interior, around the other of the said two further rotatable pulleys, and back along the beam member interior to an anchorage point on the beam member, and the arrangement being such that a movement of the connection of the other end of the piston and cylinder assembly by a distance X along the length of the beam member in one or the opposite direction results in an effective lengthening or shortening of each cable by an amount of 2X.
Advantageously the cable anchorage points are adjustable in location along the lengths of the beam member to afford a further degree of effective lengthening or shortening of the cables. Conveniently each cable is secured to the beam member at one end of the cable at the anchorage point via a screwably adjustable telescopic member which can be screwably extended or retracted to provide a degree of lengthening or shortening of the cable.
Preferably the beam member has a substantially rectangular U-shaped cross-section with a fixed or removable cover across the open mouth of the section.
Advantageously said other end of the piston and cylinder assembly is adjustably fixedly connectable to the beam member by means of one or more elongated brackets fixed to the beam member and extending in the longitudinal direction thereof, with the or each bracket carrying a series of apertures spaced apart by a distance X along its length to cooperate with bolt means passing through an end of an elongated link member pivotally fixed intermediate its ends to the said other end of the assembly.
Conveniently the free end of the piston of the piston and cylinder assembly removably carries the further two rotatable pulleys and the cylinder of the piston and cylinder assembly is adjustably fixedly connectable to the beam member at or adjacent the cylinder end remote from the end through which the piston projects.
Advantageously the link member is pivotally mounted on a pin which passes through the cylinder of the piston and cylinder assembly transverse to the longitudinal axis of the cylinder, the device including a support plate locatable on the other side of the cylinder to the link member, which support plate is provided with a series of apertures to receive and support the end of the pin remote from that attached to the link member.
According to a further aspect of the invention there is provided a vehicle body having a vehicle load lifting apparatus in combination with a cable drive device of the invention for displacing a platform of the apparatus.
For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying single sheet drawing, in which Figure 1 is a diagrammatic perspective view of a first embodiment of a cable drive device of the invention, and
Figure 2 is a diagrammatic view of the cable runs and pulleys in the device of Figure 1.
As shown in the accompanying drawings a cable drive device of the invention for displacing a platform of a vehicle load lifting apparatus includes a hollow beam member 1, two cables 2a and 2b, an array of pulleys and a fluid pressure operable piston and cylinder assembly 3 conveniently operated hydraulically via an inlet pipe 4.
The beam member 1, which conveniently has a substantially rectangular U-shaped cross-section with a fixed or removable cover (not shown) across the open mouth of the section, is locatable to extend horizontally above a vehicle rear opening. The two cables 2a and 2b, are attachable at one end 5a and 5b respectively, directly or indirectly to the platform (not shown) of the vehicle load lifting apparatus. The cables are attachable at their other ends 6a and 6b to the beam member 1.
At least three rotatable pulleys are mounted in the beam member 1. Two, 7a and 7b, of the three rotatable pulleys are rotatably mounted at or towards one end of the beam member 1 and the other 8 of the at least three rotatable pulleys is rottably mounted at or towards the other end of the beam member 1 as shown in Figures 1 and 2. The pulleys 7a and 7b and 8 can be rotatably mounted in any convenient manner on the beam 1 to rotate about an axis transverse to the longitudinal axis of the beam member 1. The pulleys 7a and 7b conveniently are mounted on the same shaft for separate rotation and are spaced apart laterally as shown in Figures 1 and 2.
The fluid pressure operable piston and cylinder assembly 3, preferably operated by hydraulic fluid delivered by a pump from a source which may form part of the vehicle hydraulic system, has an elongated cylinder 9 housing an elongated piston 10 and is located in the beam member 1 between the pulleys 7a, 7b and the pulley 8 to extend in the direction of the longitudinal axis of the beam.
As shown in Figure 1 one end of the assembly 3, in this embodiment the piston 10, carries a further two rotatable pulleys 1 a and 11 b and the other end of the assembly 3 in this embodiment of the cylinder 9, is adjustably fixedly connectable to the beam member 1 at different spaced locations therealong.
Conveniently the free end of the piston 10 carries a yoke 1 2 secured thereto in any convenient manner. The piston 10 is attached to the base of the yoke 12 and the two pulleys 11 a and 11 b are rotatably carried thereby on a pivot pin 1 3 which extends across the arms of the yoke 1 2 transversely to the longitudinal axis of the beam member 1 and transversely to the direction of movement and the piston and cylinder assembly 3.
The cylinder 9 of the assembly 3 is adjustably fixedly connectable to the beam member 1 at or adjacent the cylinder end remote from the end through which the piston 10 projects.
As illustrated the cylinder 9 is pivotally connected by a pivot pin 14 to an elongated link member 1 5 at a point intermediate the link member ends. Each end of the link member is apertured to receive bolt means passing therethrough for cooperating with a series of apertures 16 spaced apart by a distance X along the length of two elongated brackets 1 7 fixed to the beam member 1 and extending in the longitudinal direction thereof.Advantageously the pivot pin 14 on which the elongated link member 1 5 is mounted passes through the cylinder 9 of the assembly 3 transverse to the longitudinal axis of the cylinder and the de vice includes a support plate (not shown)
locatable on the other side of the cylinder line to the link member 15, which support plate is
provided with a series of apertures to receive and support the end of the pin 14 remote from that attached to the link member 1 5.
The cables 2a and 2b are located as follows when the device is operatively associated with the vehicle load lifting apparatus. The cable 2a passes up from the platform (not shown) over the pulley 7a, along the V member interior, around the pulley 1 lea and back along the beam member interior to an anchorage point on the beam member at end 6b.
This can be seen most clearly from Figure 2.
The cable 2b passes up from the platform, over the pulley 8, along the beam member interior, around pulley 7b, back along the beam member interior, around pulley 11 b, back along the beam member interior and is anchored by the end 6a at an anchorage point to the beam member 1.
This arrangement of cable and pulleys means that the platfform is raised or lowered by extending or retracting the piston and cylinder assembly 3 to raise or lower the cable ends 5a and 5b. Thus extending the piston
10 with the cylinder 9 being fixed axially as shown in Figure 1, displaces the pulleys 11 a and 11 b towards the pulley 8. This has the effect of raising the cables 2a and 2b by an amount twice the distance of movement of the piston 10 and hence of the pivot pins 1 3 and associated pulleys along the beam member 1.
The arrangement of the elongated brackets
17 and link member 1 5 means that the fixed end of the cylinder 9 of the piston and cylinder assembly 3 can be mounted at different locations along the beam member 1 by means of the cooperating bolt and apertures
16. As shown in Figure 1 the apertures 16 are spaced apart by a distance X. Thus it is possible to locate the fixed end of the cylinder 9 nearer to or further away from the pulley 8 by multiples of a distance X.Because of the arrangement of cables 2a and 2b and the pulleys 7a, 7b, 1 la and 1 ib and 8 a movement of the fixed end of the cylinder 9 towards the pulley 8 by a distance X by relocating the bolts means of the link member 1 5 in the next apertures 1 6 of the brackets 1 7, will result in a reduction of the total length of the cables 2a and 2b by an amount of twice the distance X, i.e. 2X. Similarly a displacement of the fixed end of the cylinder 9 away from the pulley 8 by a distance X to a new mounting point on the brackets 1 7 will result in an increase of the effective length of the cables 2a and 2b by an amount, in each case, equivalent to 2X.In this way the invention provides a comparatively easy means whereby an adjustment of the position of the cylinder 9 along the beam member 1 by a distance X results in an effective variation in the length of the cables 2a and 2b by 2X. It is therefore possible for a fewer number of standard length cables to be utilized with the device of the invention to fit a range of vehicle body tail aperture heights. Thus the number of different length cables stopped by the vehicle body manufacturer can be reduced with consequent savings. As shown in the
Figures with the illustrated embodiment it is only necessary to remove a cover plate from the front of the beam to afford access to the bolt means securing the link member 1 5 to the bracket 17.
Additionally in order to provide a further degree of adjustment for the length of the cables 2a and 2b utilized it is possible to provide a row of spaced apertures along the beam member for each anchorage point for the ends 6a and 6b of the cables so that the anchorage points can be relocated towards or away from the pulley 8 in the beam member 1 to provide further degree of effective lengthening or shortening of the cables. Additionally and/or alternatively the ends 6a and 6b of the cables may be secured to the beam member via screwably adjustable telescopic members. These telescopic members are secured to the beam member at the anchorage points and can be screwably extended or retracted to provide an additional degree of lengthening or shortening of the cables. All the foregoing means of varying the cable effective length can be utilized to provide for relatively easy alteration of the cable length during the working life of a vehicle fitted with the cable drive device of the invention, in order to compensate for changes in length of the cables due to stretching or changes in location of the platform due to variation in vehicle spring or body height.
The present invention also contemplates the provision of a vehicle body having a vehicle load lifting apparatus in conjunction with a cable drive device of the invention for displacing a platform of the apparatus.
Claims (9)
1. A cable drive device for displacing a platform of a vehicle load lifting apparatus, which device includes a hollow beam member locatable to extend horizontally above a vehicle rear opening, two cables attachable at one end directly or indirectly to the platform of a vehicle load lifting apparatus and attachable at the other end to the beam member, at least three rotatable pulleys mounted in the beam member two at or towards one end of the beam member and the other at or towards the other end of the beam member, and a fluid pressure operable piston and cylinder assembly located in the beam member between said two and said other rotatable pulleys with one end of the assembly carrying a further two rotatable pulleys and with the other end of the assembly being adjustably fixedly connectable to the beam member at different spaced locations therealong, the cable being locatable such that when the device is operatively associated with a vehicle load lifting apparatus, one cable passes up from the platform, over one of the said two of the three rotatable pulleys, along the beam member interior, around one of the said two further rotatable pulleys and back along the beam member interior to an anchorage point on the beam member, and the other cable passes up from the platform, over the other of the said three rotatable pulleys along the beam member interior, around the other of the said two of the said three rotatable pulleys, back along the beam member interior, around the other of the said two further rotatable pulleys, and back along the beam member interior to an anchorage point on the beam member, and the arrangement being such that a movement of the connection of the other end of the piston and cylinder assembly by a distance X along the length of the beam member in one or the opposite direction results in an effective lengthening or shortening of each cable by an amount of 2X.
2. A device according to claim 1, wherein the cable anchorage points are adjustable in location along the lengths of the beam member to afford a further degree of effective lengthening or shortening of the cables.
3. A device according to claim 1 or claim 2, wherein each cable is secured to the beam member at one end of the cable at the anchorage point via a screwably adjustable telescopic member which can be screwably extended or retracted to provide a degree of lengthening or shortening of the cable.
4. A device according to any one of claims 1 to 3, wherein the beam member has a substantially rectangular U-shaped cross-section with a fixed or removable cover across the open mouth of the section.
5. A device according to any one of claims 1 to 4, wherein said other end of the piston and cylinder assembly is adjustably fixedly connectable to the beam member by means of one or more elongated brackets fixed to the beam member and extending in the longitudinal direction thereof, with the or each bracket carrying a series of apertures spaced apart by a distance X along its length to cooperate with bolt means passing through an end of an elongated link member pivotally fixed intermediate its ends to the said other end of the assembly.
6. A device according to claim 5, wherein the free end of the piston of the piston and cylinder assembly removably carries the further two rotatable pulleys and the cylinder of the piston and cylinder assembly is adjustably fixedly connectable to the beam member at or adjacent the cylinder end remote from the end through which the piston projects.
7. A device according to claim 5 or claim 6, wherein the link member is pivotally mounted on a pin which passes through the cylinder of the piston and cylinder assembly transverse to the longitudinal axis of the cylinder, the device including a support plate locatable on the other side of the cylinder to the link member, which support plate is provided with a series of apertures to receive and support is provided with a series of apertures to receive and support the end of the pin remote from that attached to the link member.
8. A cable drive device for displacing a platform of a vehicle load lifting apparatus, substantially as hereinbefore described with reference to the accompanying drawing.
9. A vehicle body having a vehicle load lifting apparatus in combination with a cable drive device according to any one of claims 1 to 8 displacing a platform of the apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08314212A GB2140385B (en) | 1983-05-23 | 1983-05-23 | Cable drive device for displacing a platform of a vehicle load lifting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08314212A GB2140385B (en) | 1983-05-23 | 1983-05-23 | Cable drive device for displacing a platform of a vehicle load lifting apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8314212D0 GB8314212D0 (en) | 1983-06-29 |
| GB2140385A true GB2140385A (en) | 1984-11-28 |
| GB2140385B GB2140385B (en) | 1986-07-02 |
Family
ID=10543204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08314212A Expired GB2140385B (en) | 1983-05-23 | 1983-05-23 | Cable drive device for displacing a platform of a vehicle load lifting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2140385B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2068111A2 (en) * | 1992-12-21 | 1995-04-01 | Vilanova Jose Casanovas | Actuation mechanism for lifting platforms |
| GB2306433A (en) * | 1995-10-19 | 1997-05-07 | Ratcliff Tail Lifts Ltd | Automatic deployment of underfloor lift |
| EP1127738A1 (en) * | 2000-02-23 | 2001-08-29 | Jan Jozef Prudence Dhollander | Device for loading and unloading cargo vehicles |
| EP1132256A3 (en) * | 2000-03-08 | 2002-11-13 | Giampaolo Nelzi | Translation device, in particular for side loading boards of industrial vehicles |
| US6623038B2 (en) * | 2000-12-14 | 2003-09-23 | James Field | Automatic lifting mud flap assembly |
| JP2010100130A (en) * | 2008-10-22 | 2010-05-06 | Kyokuto Kaihatsu Kogyo Co Ltd | Load receiving base lifting device for cargo vehicle |
| JP2010100131A (en) * | 2008-10-22 | 2010-05-06 | Kyokuto Kaihatsu Kogyo Co Ltd | Load receiving base lifting device for cargo vehicle |
| US20130034414A1 (en) * | 2011-08-04 | 2013-02-07 | Nippon Sharyo, Ltd. | Vehicle |
| US11591114B2 (en) * | 2021-07-01 | 2023-02-28 | Johann Paulus KOTZE | Aircraft loader |
| EP4155125A3 (en) * | 2021-09-22 | 2023-07-19 | Palfinger Tail Lifts GmbH | Cantilever lift |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1093128A (en) * | 1965-10-08 | 1967-11-29 | Usi Engineering Ltd | Improvements in or relating to load lifting and lowering units |
| GB1237622A (en) * | 1969-02-06 | 1971-06-30 | Burtonwood Mechanical Company | Improvements in or relating to vehicle load lifting and lowering units |
-
1983
- 1983-05-23 GB GB08314212A patent/GB2140385B/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1093128A (en) * | 1965-10-08 | 1967-11-29 | Usi Engineering Ltd | Improvements in or relating to load lifting and lowering units |
| GB1237622A (en) * | 1969-02-06 | 1971-06-30 | Burtonwood Mechanical Company | Improvements in or relating to vehicle load lifting and lowering units |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2068111A2 (en) * | 1992-12-21 | 1995-04-01 | Vilanova Jose Casanovas | Actuation mechanism for lifting platforms |
| GB2306433A (en) * | 1995-10-19 | 1997-05-07 | Ratcliff Tail Lifts Ltd | Automatic deployment of underfloor lift |
| GB2306433B (en) * | 1995-10-19 | 1999-01-13 | Ratcliff Tail Lifts Ltd | Automatic deployment of underfloor lift |
| EP1127738A1 (en) * | 2000-02-23 | 2001-08-29 | Jan Jozef Prudence Dhollander | Device for loading and unloading cargo vehicles |
| BE1013295A3 (en) * | 2000-02-23 | 2001-11-06 | Dhollander Jan Jozef Prudence | Device for loading and unloading goods vehicles. |
| EP1132256A3 (en) * | 2000-03-08 | 2002-11-13 | Giampaolo Nelzi | Translation device, in particular for side loading boards of industrial vehicles |
| US6623038B2 (en) * | 2000-12-14 | 2003-09-23 | James Field | Automatic lifting mud flap assembly |
| JP2010100130A (en) * | 2008-10-22 | 2010-05-06 | Kyokuto Kaihatsu Kogyo Co Ltd | Load receiving base lifting device for cargo vehicle |
| JP2010100131A (en) * | 2008-10-22 | 2010-05-06 | Kyokuto Kaihatsu Kogyo Co Ltd | Load receiving base lifting device for cargo vehicle |
| US20130034414A1 (en) * | 2011-08-04 | 2013-02-07 | Nippon Sharyo, Ltd. | Vehicle |
| US9126523B2 (en) * | 2011-08-04 | 2015-09-08 | Central Japan Railway Company | Vehicle elevating a working beam with respect to booms |
| US11591114B2 (en) * | 2021-07-01 | 2023-02-28 | Johann Paulus KOTZE | Aircraft loader |
| EP4155125A3 (en) * | 2021-09-22 | 2023-07-19 | Palfinger Tail Lifts GmbH | Cantilever lift |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8314212D0 (en) | 1983-06-29 |
| GB2140385B (en) | 1986-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |