GB1599713A

GB1599713A - Hoisting mechanism

Info

Publication number: GB1599713A
Application number: GB19753/78A
Authority: GB
Original assignee: ASEA AB
Current assignee: ABB Norden Holding AB
Priority date: 1977-06-23
Filing date: 1978-05-16
Publication date: 1981-10-07
Also published as: SE406314B; DE2825602A1; SE7707299L

Description

(54) HOISTING MECHANISM (71) We, ASEA AKTIEBOLAG, a Swedish Company of Västeras, Sweden, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a hoisting mechanism of the kind comprising an elongate support, preferably a girder, means on the support for supporting a winding drum at one side of said support with its axis of rotation substantially parallel to the longitudinal axis of said support, a hoisting motor on the opposite side of said support from the winding drum, and a gearing at one end of said support having an input shaft at said opposite side of the support from the hoisting motor to the winding drum.

A hoisting mechanism of this kind is described, for example, in our British Patent Specification No. 1,138,157, and the present invention aims to provide an improved hoisting mechanism of the kind referred to which is constructed so as to achieve, in a better way than before, a compact mechanism suitable for a plurality of types as far as the hoisting rope guide is concerned with a small number of basic units, for example a hoisting mechanism with two-strand rope guiding without locking in the lifting unit or with four- and eight-stand locking in the lifting unit.

According to the invention a hoisting mechanism of the kind referred to is characterised in that the hoisting motor is placed at the opposite end of said support in relation to the gearing and is joined to the input shaft of the gearing by an intermediate shaft disposed substantially parallel to the axis of the winding drum.

Preferably, the hoisting motor is a oneor two-speed motor mounted on said opposite side of said support in a position where it completely or partly counterbalances the gearing. Said gearing may comprise a planetary gearing to which both said hoisting motor and a separate auxiliary motor for low hoisting speed are connected.

One embodiment of the hoisting mechanism according to the invention comprises a runner intended to run on a runway located above the hoisting mechanism and provided with attachment means hanging down on each side of said support, said attachment means being fixed in relation to said support by means of a shaft which supports one or more pulley wheels. With this arrangement the runner directly absorbs the forces from pulley wheels so that the stresses in the frame of the hoisting mechanism are small.

The winding drum may be supported by the drive shaft pin of the gear and by a shaft pin arranged at the opposite end of said support and being tiltable around a horizontal shaft, said shaft pin being included in an overload protection means. The lastmentioned shaft pin may be joumalled in a bearing in the overload protection means which is supported by an end plate at one end of said support, the winding drum being journalled on a bearing on the shaft pin.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which Figure 1 is an exploded view of a hoisting mechanism according to the invention Figure 2 is a sectional view, on an enlarged scale, through the mid-portion of the hoisting mechanism showing the connection between the elongate support of the mechanism and a runner, and Figure 3 is a detailed sectional view, on an enlarged scale, showing the overload protection means of the hoisting mechanism of Figure 1.

In Figure 1, the numeral 1 designates an elongate support in the form of a box girder with end plates 2 and 3 for attachment, respectively, of a gearing 4 and a winding drum 5 and with attachment means 6 for a main hoisting motor 7 with a brake 8. The gear 4 comprises a planetary gearing unit 9 with an auxiliary hoisting motor 10 with a brake 11 for a low hoisting speed, "creep speed". The motor 10 is a flange motor which is connected by gearing to the external gear rim of the planetary gearing unit 9. The main motor 7 is connected to the input shaft pin 15 of the planetary gearing 9 though a coupling 12, an intermediate shaft 13 and a coupling 14. The motor 7 is located in a suitable position on the girder 1 so that it completely, or at least partly, counterbalances the gear 4.The connection of the motor 7 to the gear 4 by an intermediate shaft also provides better space for pulley wheels and thus makes possible a more compact construction. The shaft pin 15 can drive the sun-wheels or planet wheel carrier of the planetary gearing unit 9. The winding drum 5 is tubular and provided with end pieces 16 which are connected to the winding drum by a number of radial pins or bolts 17. The winding drum 5 is arranged one one side of the girder 1 between the gear 4 and the end plate 3. The end pieces 16 of the winding drum 5 are journalled on the output shaft pin 18 of the gear 4 and on ball or roller bearings on the shaft pin 20 of an overload protection means 19.

At the mid-portion of the girder 1 there is a hole for a shaft 21. This is intended for holding the girder 1 and a runner 2 together as well as for supporting rope pulleys 23, 24 and 25 and also a rope protection means 26 and 27. The rope pulleys are fixed on the shaft 21 by washers 28 and bolts 29.

The pulley means, for example one or more ropes or chains, and the lifting hook of the hoisting mechanism are not shown in the drawings. These may be of conventional design, one example of which is shown in Specification No. 1,138,157.

Figure 2 shows two downwardly-projecting plates 30 of the runner 22 which extend over the girder 1 and are joined thereto by the shaft 21. The load from the rope pulleys is transmitted directly to the runner 22 by way of the shaft 21. The- runner 22 is otherwise of a quite conventional design with two free-running travelling wheels 31 and two toothed driving wheels 32 interconnected by a drive shaft 33. The drive is effected by a motor 34 via a gearing 35, the output shaft of which supports a gearing which engages with the teeth of one of the wheels 32. The gearing 35 is mounted on a plate 37 on the body of the runner. It is also possible to mount the hoisting mechanism on a trolley instead of suspending it from a runner. The hoisting mechanism can then be provided with a support 38.

The overload protection means 19 consists of a tubular holder 39 with an attachment flange 41 by which it is attached to the end plate 3. The shaft pin 20 is journalled in a holder 40 by a spherical bearing 42. One end piece 16 of the winding drum is supported by a spherical bearing 43 on the shaft pin 20. The shaft pin 20 is held in the normal position shown by means of a bolt 44 and a spring 45 in the form of a stack of Belleville washers. An adjusting screw 46 activates a limit switch 47 which breaks the current to the hoisting movement of the hoisting motors when the torque around bearing 42 becomes so great that the force of spring 45 is overcome and the outer pin end is lifted so that a breaking gap in switch 47 influences an electric circuit.

WHAT WE CLAIM IS:- 1. A hoisting mechanism comprising an elongate support, means on the support for supporting a winding drum at one side of said support with its axis of rotation substantially parallel to the longitudinal axis of said support, a hoisting motor on the opposite side of said support from the winding drum, and a gearing at one end of said support having an input shaft at said opposite side of the support and an output shaft at said one side of the support for transmitting the drive from the hoisting motor to the winding drum, characterised in that the hoisting motor is placed at the opposite end of said support in relation to the gearing and is joined to the input shaft of the gearing by an intermediate shaft disposed substantially parallel to the axis of the winding drum.

2. A hoisting mechanism according to claim 1, in which the hoisting motor is a one- or two-speed motor mounted on said opposite side. of said support in a position where it completely or partly counterbalances the gearing.

3. A hoisting mechanism according to claim 1, in which said gearing comprises a planetary gearing- to which both said hoisting motor and a separate auxiliary motor for low hoisting speed are connected.

4. A hoisting mechanism according to any of the preceding claims, comprising a runner intended to run on a runway located above the hoisting mechanism and provided with attachment means hanging down on each side of said support, said attachment means being fixed in relation to said support by means of a shaft which supports one or more pulley wheels.

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. Figure 3 is a detailed sectional view, on an enlarged scale, showing the overload protection means of the hoisting mechanism of Figure 1. In Figure 1, the numeral 1 designates an elongate support in the form of a box girder with end plates 2 and 3 for attachment, respectively, of a gearing 4 and a winding drum 5 and with attachment means 6 for a main hoisting motor 7 with a brake 8. The gear 4 comprises a planetary gearing unit 9 with an auxiliary hoisting motor 10 with a brake 11 for a low hoisting speed, "creep speed". The motor 10 is a flange motor which is connected by gearing to the external gear rim of the planetary gearing unit 9. The main motor 7 is connected to the input shaft pin 15 of the planetary gearing 9 though a coupling 12, an intermediate shaft 13 and a coupling 14. The motor 7 is located in a suitable position on the girder 1 so that it completely, or at least partly, counterbalances the gear 4.The connection of the motor 7 to the gear 4 by an intermediate shaft also provides better space for pulley wheels and thus makes possible a more compact construction. The shaft pin 15 can drive the sun-wheels or planet wheel carrier of the planetary gearing unit 9. The winding drum 5 is tubular and provided with end pieces 16 which are connected to the winding drum by a number of radial pins or bolts 17. The winding drum 5 is arranged one one side of the girder 1 between the gear 4 and the end plate 3. The end pieces 16 of the winding drum 5 are journalled on the output shaft pin 18 of the gear 4 and on ball or roller bearings on the shaft pin 20 of an overload protection means 19. At the mid-portion of the girder 1 there is a hole for a shaft 21. This is intended for holding the girder 1 and a runner 2 together as well as for supporting rope pulleys 23, 24 and 25 and also a rope protection means 26 and 27. The rope pulleys are fixed on the shaft 21 by washers 28 and bolts 29. The pulley means, for example one or more ropes or chains, and the lifting hook of the hoisting mechanism are not shown in the drawings. These may be of conventional design, one example of which is shown in Specification No. 1,138,157. Figure 2 shows two downwardly-projecting plates 30 of the runner 22 which extend over the girder 1 and are joined thereto by the shaft 21. The load from the rope pulleys is transmitted directly to the runner 22 by way of the shaft 21. The- runner 22 is otherwise of a quite conventional design with two free-running travelling wheels 31 and two toothed driving wheels 32 interconnected by a drive shaft 33. The drive is effected by a motor 34 via a gearing 35, the output shaft of which supports a gearing which engages with the teeth of one of the wheels 32. The gearing 35 is mounted on a plate 37 on the body of the runner. It is also possible to mount the hoisting mechanism on a trolley instead of suspending it from a runner. The hoisting mechanism can then be provided with a support 38. The overload protection means 19 consists of a tubular holder 39 with an attachment flange 41 by which it is attached to the end plate 3. The shaft pin 20 is journalled in a holder 40 by a spherical bearing 42. One end piece 16 of the winding drum is supported by a spherical bearing 43 on the shaft pin 20. The shaft pin 20 is held in the normal position shown by means of a bolt 44 and a spring 45 in the form of a stack of Belleville washers. An adjusting screw 46 activates a limit switch 47 which breaks the current to the hoisting movement of the hoisting motors when the torque around bearing 42 becomes so great that the force of spring 45 is overcome and the outer pin end is lifted so that a breaking gap in switch 47 influences an electric circuit. WHAT WE CLAIM IS:-

1. A hoisting mechanism comprising an elongate support, means on the support for supporting a winding drum at one side of said support with its axis of rotation substantially parallel to the longitudinal axis of said support, a hoisting motor on the opposite side of said support from the winding drum, and a gearing at one end of said support having an input shaft at said opposite side of the support and an output shaft at said one side of the support for transmitting the drive from the hoisting motor to the winding drum, characterised in that the hoisting motor is placed at the opposite end of said support in relation to the gearing and is joined to the input shaft of the gearing by an intermediate shaft disposed substantially parallel to the axis of the winding drum.

5. A hoisting mechanism according to

any of claims 1 to 3, in which the winding drum is supported by the drive shaft pin of the gear and by a shaft pin arranged at the opposite end of said support and being tiltable around a horizontal shaft, said shaft pin being included in an overload protection means.

6. A hoisting mechanism according to claim 5, in which said last-mentioned shaft pin is journalled in a bearing in the overload protection means which is supported by an end plate at one end of said support, the winding drum being journalled on a bearing on the shaft pin.

7. A hoisting mechanism according to any of claims 1 to 3, in which the winding drum is tubular and has detachable end pieces.

8. A hoisting mechanism according to any of the preceding claims, in which said support is a girder.

9. A hoisting mechanism constructed and arranged substantially as herein described with reference to, and as illustrated in, the accompanying drawings.