GB2210600A

GB2210600A - Roller and beam jacking device

Info

Publication number: GB2210600A
Application number: GB8723702A
Authority: GB
Inventors: Micheal Stanley Rook
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-10-09
Filing date: 1987-10-09
Publication date: 1989-06-14
Also published as: GB8723702D0

Abstract

A jacking device comprises a beam (1 or 16) with load-supporting means (2) at one end, and supported by one or more wheels or rollers which are caused to move relative to the beam to lift the load-supporting means, either by pushing the wheels or rollers towards the load (Fig. 2), or by pulling the beam (Fig. 3). When more than one roller, e.g. is employed (as shown), the rollers are of increasing diameter away from the load, and their axes are linked together. In the embodiment of Fig. 3, a carriage (22) with two wheels, is mounted on the beam (16) for movement therealong as the towing vehicle moves. Locking means are provided to fix the carriage to the beam at the load-supporting end when it reaches it, and rollers (19) and (20) are upwardly spring-loaded. <IMAGE>

Description

ROLLER AND BESI JACKING DEVICE This invention relates to the use of a chain of one or more rollers and a beam for producing an amplified force.

The use of rollers, escarpments and levers for lifting heavy weights is well knout in antiquity. In such system the escarpment is fixed and the rollers move and the application is there by limited.

In this invention a beam rolls over one roller, or a chain of rollers of increasing diameter, the axles of which are linked together.

On end of the beam is attached to or placed beneath the load whilst the other end acts by self weight or by a seperately applied force over each of the rollers in turn which act as a fulcrum to lift the load.

The beam may be attached to a movable load in which case the beam is drawn over the rollers.

Where the load is movable the beam may be locked to the axle of one of the rollers and the device may be used as a trolley for transporting the load.

Specific embodiments of the invention are now described by way of example.

Refer to figure 1 for the first example which shows the device lifting a stationary load.

The beam 1 is attached by a suitable catchment or cradle to the load 2.

Rollers 3, 4, 5, 6, 7 of different diameter are connected at axles by a link, bar. The rollers 3,4,5,6,7 stand on a platform 9 zilch is provided with wheels 10 rolling on a base plate 13. A force is applied to the upper end of the beam at 11 either by the self weight of the bean or by external application.

The wheel set 3, 4, 5, 6, 7 on platform 9 is pushed towards the load with small roller 3 acting as fulcrum in first instance until the load begins to lift.

As the roller 3 rolls past end of beam the next roller 4 takes over with additional wheels 5, 6, 7 until the load is lifted to the desired height whilst the roller 3, 4, 5, 6, 7 roll against the beam 1. The platform 9 is moved on rollers 10 further under the load.

A catchment device 12 engages with the last roller 7 to prevent it running over the end.

Figure 2 shows the device in the elevated position. This example shows 5 rollers but any number can be used.

The second example isshown in figure 3. This is an application in which the device is used to lift the front or back of a vehicle and is used as a towing trolley.

The load 14 has a set of road wheels 15, one end of a beam 16 is attached to the load by a catchment or cradle 18 whilst the other end of the beam is attached to a towing vehicle 17.

One or more wheels 19, 20 act as rollers which run between the ground and the beam 16, a further wheel 21 whose axle is fixed by means of a carrier 22 is attached to the beam 16. The design of the cradle is described below.

The carrier 22 is attached by a continuous :.nk bar or bars 23 to the axle of the wheels 19, 20.

As the towing vehicle 17 moves forward the wheel 19 approaches the lifting point 18. l'Alereupon the cradle 18 is lifted progressively higher. 07hen the wheel 19 reaches the end of the beam 16 at 18 the next wheel 20 takes over and continues to lift at 18. XIhen this wheel 20 reaches the end of the beam 16 at 18 the wheel 21 and carrier 22 take the load.

The carrier 22 progresses along the beam 16 until it reaches catchemnt 24.

At the catchment 24 the wheel 21 becomes free to rotate on its axle independent of the beam 16 by the mechanism described below for the carrier.

Figure 4 shows the device in the elevated position. Note that a spring is fitted between carrier 22 and link 23 to lift the idle wheels 19 and 20 clear of the ground.

The carrier and wheel mechanism 22 and 23 are illustrated in figure 5. The figure shows the carrier at the end of travel.

The wheel 21 is in two parts on each end of axle 26. A dolly wheel 25 is at the centre of the axle. Bearings 27 permits the axle 26 to rotate in the cradle 22.

The diameter of the dolly wheel 25 relative to the wheel 21 is such that the bottom of the beam 16 is supported by the dolly wheel 15. In this mode the beam 16 rolls over the dolly wheel 25 as the wheels 21 rotate enabling the beam to be rolled along.

then the cradle has moved sufficiently near the end of the beam 16 it meets a stop and latch 29 and an escapment 28. The rollers 30 whose axles are fixed in the cradle then bear the weight of the beam 16 and the dolly wheel 25 and wheel 21 are then free to rotate without touching the beam 16.

In this mode wheel 21 may be used as a trolley for moving the load 14.

The third example is similar to the second example described above but the wheels 15 on the load 14 are onitted and the point of application of the lower end of the beam is made to coincide with the centre of gravity of the load.

Claims

1. A beam rolls over one roller or a chain of rollers of increasing diameter, the axles of which are linked together.

One end of the beam is attached to or placed beneath the load whilst the other end acts by self weight or by a seperately applied force over each of the rollers in turn which act as a fulcrum to lift the load.

2. A device as claimed in Claim 1, wherein the device is used to lift a stationary loadsmeans are provided for a platform on rollers or wheels to run beneath the main rollers so that as the platform is pushed towards the load the end of the beam supporting the load is lifted but not moved horizontally.

3. A device as claimed in Claim 1, wherein the device is used to lift a mobile load, means are provided for the free end of the beam to be pulled over the rollers progressively thereby lifting the load whilst it moves horizontally at the same time.

4. A device as claimed in Claim 3 wherein means are provided for the largest roller to be mounted in a special carriage so that when the largest roller-reaches a predetermined point on the beam the roller becomes free to rotate on its own axle which is mounted in bearing mounted on the carriage and the device can thereby be used as a trolley for transporting the load.

5. A device as in Claim 3 where only one roller is used.

6. A device as in Claim 3 and 4 whereby only one roller mounted in the special carriage is used.