GB2068852A

GB2068852A - Tread recut lift rotator

Info

Publication number: GB2068852A
Application number: GB7935867A
Authority: GB
Original assignee: JENKINSON K
Current assignee: JENKINSON K
Priority date: 1979-10-16
Filing date: 1979-10-16
Publication date: 1981-08-19

Abstract

Commerical vehicle tyres when worn can be what is called recut. This is done by cutting the existing tread deeper with an electrically heated element. This is rather laborious for the operator as he has to hold the wheel upright whilst doing the cutting and also lift and turn same to enable him to cover the whole tyre. Due to the different tyre sizes he has no set comfortable working position. Using the illustrated equipment would eliminate all these problems. The operator would select tyre wheel to be cut, set adjustable wheel studs to wheel size to mount the wheel on the equipment, jack-up wheel by hydraulic means to comfortable working height. He would then cut top section, spin wheel unidirectionally, as allowed by a pawl and ratchet mechanism, to next area and so on until the whole circumference of the tyre has been recut. <IMAGE>

Description

SPECIFICATION Tread, recut, lift s rotator Commerical wheel-tyres when worn to the limit of their tread pattern can be what is called "recut" and used again to give them an extended life. This is done by using a hand operated electric cutter which has a heated element which is inserted in the existing tread of the tyre and when pushed along following the worn tread pattern burns out a single piece of rubber to a predetermined depth, which in effect is creating a new tread area.

When being cut the tyre, which is always fitted to its wheel, is in the upright position and the immediate section uppermost is the first area to be cut working across the width of the tyre. Once this area has been worked the operator has then to lift the tyre-wheel and also turn same to get to the next area to be cut, which means with a large wheel the operator would have to repeat the process approximately 5 times before the complete circumference of the tyre is completed.

This method of recutting is far from satisfactory and does create problems for the operator. For example, working with a large size tyre-wheel weighing well over a CWT he has to keep the wheel in an upright position whilst pushing the cutter through the tyre tread. He also has the problem, as already explained, of getting the tyre-wheel round to the next area to be worked. In addition to this, there is always the possibility of the tyre-wheel accidentally falling and injuring the operator. To go down the scale to a smaller tyre-wheel, if the operator has 4/5 of these to do he would find this very tiring, due to having to be in a bending position to carry out the operation.

Using the equipment shown on the attached copies would eliminate all these problems. The tyre-wheel would be securely bolted in position, and any size wheel could be set to a comfortable height to suit the operator.

Rotation of the tyre-wheel is one way only to accommodate resistance when the cutter is pushed through tyre.

Equipment would be bolted to wall via anchor plate and floor via base plate. The anchor plate carries a sliding block which is securely held in the anchor plate, but is free to move up and down same. Welded to the slider block is a housing which carries two bearings and a shaft. This extends out of the housing and located on this is a racket which mates up with a pawl on the housing. At the very end of the shaft is the rotator plate-this plate has a series of holes and these are to suit different size wheels. Only 3 sizes are shown on the drawing, but simply by drilling holes in the appropriate places the problem of different wheel sizes is of no consequence. To mate up with holes in the rotor plate there are two brackets with a wheel stud welded to each. They are made with a close tolerance fit to avoid excessive movements when tyrewheel is being rotated.These move along the rotation plate and locate in the holes by means of a spring loaded pin. All this assembly is mounted on top of the piston rod of the Hydraulic Ram in order that it can be lifted or lowered by hydraulic means to suit the size of the tyre-wheel being worked on. The operator using the equipment would select wheel to be recut, move adjustable studs in position to suit tyre-wheel, set rotator plate for loading, locate wheel on studs and secure with extended nuts and then pump up to the best working position.

The top area would be recut first, the tyrewheel would be rotated towards operator to next section and so on until the complete circumference of tyre has been recut. I do not know of any equipment in use like this and I think this is probably due to the different tyre heights and widths, which has created problems in design of same.

CLAIM

Equipment consists of an anchor plate and slide assembly. Into this is fitted to square section which is securely held, but is free to slide up and down the plate as required.

Welded to this square section is a housing which carries a round shaft supported by two bearings. On to the end of this shaft there is what is called a roter plate. This plate is drilled with holes at set distances apart and these holes are to accommodate the different wheel sizes. On this plate are two sliding brackets and each is fitted with a wheel stud.

These have spring loaded pins for location so they can be moved to any position on the roter plate depending on the size of the tyre wheel being recut. The plate is also fitted with a ratchet which mates up with a pawl on top of the housing. This is for one way operation to stop tyre wheel turning when cutter is in operation. Also on the plate is a knob fitted in a central position to line plate up with wheel holes when equipment is being loaded. The whole assembly is mounted on a hydraulic ram which is operated by hand pump mounted on top of the anchor plate.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **.

SPECIFICATION Tread, recut, lift s rotator Commerical wheel-tyres when worn to the limit of their tread pattern can be what is called "recut" and used again to give them an extended life. This is done by using a hand operated electric cutter which has a heated element which is inserted in the existing tread of the tyre and when pushed along following the worn tread pattern burns out a single piece of rubber to a predetermined depth, which in effect is creating a new tread area.

When being cut the tyre, which is always fitted to its wheel, is in the upright position and the immediate section uppermost is the first area to be cut working across the width of the tyre. Once this area has been worked the operator has then to lift the tyre-wheel and also turn same to get to the next area to be cut, which means with a large wheel the operator would have to repeat the process approximately 5 times before the complete circumference of the tyre is completed.

This method of recutting is far from satisfactory and does create problems for the operator. For example, working with a large size tyre-wheel weighing well over a CWT he has to keep the wheel in an upright position whilst pushing the cutter through the tyre tread. He also has the problem, as already explained, of getting the tyre-wheel round to the next area to be worked. In addition to this, there is always the possibility of the tyre-wheel accidentally falling and injuring the operator. To go down the scale to a smaller tyre-wheel, if the operator has 4/5 of these to do he would find this very tiring, due to having to be in a bending position to carry out the operation.

Using the equipment shown on the attached copies would eliminate all these problems. The tyre-wheel would be securely bolted in position, and any size wheel could be set to a comfortable height to suit the operator.

Rotation of the tyre-wheel is one way only to accommodate resistance when the cutter is pushed through tyre.

Equipment would be bolted to wall via anchor plate and floor via base plate. The anchor plate carries a sliding block which is securely held in the anchor plate, but is free to move up and down same. Welded to the slider block is a housing which carries two bearings and a shaft. This extends out of the housing and located on this is a racket which mates up with a pawl on the housing. At the very end of the shaft is the rotator plate-this plate has a series of holes and these are to suit different size wheels. Only 3 sizes are shown on the drawing, but simply by drilling holes in the appropriate places the problem of different wheel sizes is of no consequence. To mate up with holes in the rotor plate there are two brackets with a wheel stud welded to each. They are made with a close tolerance fit to avoid excessive movements when tyrewheel is being rotated.These move along the rotation plate and locate in the holes by means of a spring loaded pin. All this assembly is mounted on top of the piston rod of the Hydraulic Ram in order that it can be lifted or lowered by hydraulic means to suit the size of the tyre-wheel being worked on. The operator using the equipment would select wheel to be recut, move adjustable studs in position to suit tyre-wheel, set rotator plate for loading, locate wheel on studs and secure with extended nuts and then pump up to the best working position.

The top area would be recut first, the tyrewheel would be rotated towards operator to next section and so on until the complete circumference of tyre has been recut. I do not know of any equipment in use like this and I think this is probably due to the different tyre heights and widths, which has created problems in design of same.

CLAIM

Equipment consists of an anchor plate and slide assembly. Into this is fitted to square section which is securely held, but is free to slide up and down the plate as required.

Welded to this square section is a housing which carries a round shaft supported by two bearings. On to the end of this shaft there is what is called a roter plate. This plate is drilled with holes at set distances apart and these holes are to accommodate the different wheel sizes. On this plate are two sliding brackets and each is fitted with a wheel stud.

These have spring loaded pins for location so they can be moved to any position on the roter plate depending on the size of the tyre wheel being recut. The plate is also fitted with a ratchet which mates up with a pawl on top of the housing. This is for one way operation to stop tyre wheel turning when cutter is in operation. Also on the plate is a knob fitted in a central position to line plate up with wheel holes when equipment is being loaded. The whole assembly is mounted on a hydraulic ram which is operated by hand pump mounted on top of the anchor plate.