EP0540491A1

EP0540491A1 - Trolley for cableway

Info

Publication number: EP0540491A1
Application number: EP92850254A
Authority: EP
Inventors: Jarle Larsen
Original assignee: IGLAND AS
Current assignee: IGLAND AS
Priority date: 1991-10-30
Filing date: 1992-10-28
Publication date: 1993-05-05
Also published as: NO174040B; NO914253D0; NO914253L; NO174040C

Abstract

A trolley for cableways having a pulling wire (7) and a return wire (6) passing one time around two respective cams (1, 2), which are drive-coupled with each other. The drive - coupling is formed by oil motors (9, 10) connected with the cams (1, 2), which are coupled together on the hydraulic side. Between the oil motors (9, 10) is provided a radio controlled valve (13) which closes the flow of oil to both lines (3) to the oil motor (10), connected to the cam/hoisting line drum (1, 4), and simultaneously disengages the second motor (9) allowing it to run freely when the trolley is driven along the cableway. To lift/lower a load (8), the valve is opened so that the oil motors may be coupled together on the hydraulic side and control each other's speed so that equal amounts of wire pass both the cams (1, 2) simultaneously, and the cam (1) on the pull-in side of the winch, which is coupled to the hoisting drum (4) via e.g. a chain drive, drives the hoisting line out or in depending on the direction of the winch.

Description

The present invention relates to a trolley for cableways having a wire running via an end sheave via the trolley and back to the winch.
In previously known devices utilizing a trolley it has been necessary to lock the trolley securely to a supporting wire at the same time as the runner is used as the power outlet for raising and lowering the load. This construction is unnecessarily complicated and expensive.
The purpose of the present invention is to make it possible to secure the trolley at an arbitrary place while lifting and lowering a load, without its being necessary to undertake locking of the trolley to a supporting wire. At the same time the wire stags taut through the entire process.
It is a further purpose of the present invention to attain the same advantages as with use of a trolley for a cableway having three running lines or two running lines and a permanent supporting cable.
With traditional equipment having two lines, the cableway must be slacked down in order to be able to draw out the hoisting lines.
The aforementioned objectives are provided by means of an apparatus of the type mentioned in the introduction above, the characterizing features of which are disclosed in claim 1. Further features of the invention are apparent from the other dependent claims.
By coupling the oil motors together on the hydraulic side, these will control each other's speed. As a result, equal amounts of wire will pass both cams simultaneously. Since the cam on the pull-in side of the winch is coupled to the hoisting drum via, e.g., a chain drive, the hoisting line may be driven out or in by merely changing the winch direction.
The driving of the trolley along the cableway takes place when a radio controlled valve between the oil motors closes the oil flow to both the lines on the oil motor, connected to the cam/hoisting line drum, and simultaneously disengages the second motor so that it is able to run freely.
The invention will be described further in the following, with reference to the drawings, where:
Figure 1 is a schematic illustration of the trolley.
Figure 2 is a schematic illustration of the connection between the oil motors.
Figure 1 is a schematic view of the trolley for cableways with a pulling wire 7 passing one time around a cam 1 with the return wire 6 passing over a cam 2. Cam 2 is shown coupled with an oil motor 9 which is connected via hydraulic lines 3 with an oil motor 10 connected with cam 1. Cam 1 is shown coupled via a chain drive 5 with a hoisting drum 4. The hoisting drum may, however, be connected by other means with cam 1, such as e.g. via gear transmission, or the hoisting drum may be coupled directly with cam 1. When the trolley is moved along the line, cam 1 will stand still; i.e., the oil connection between oil motors 10 and 9 via line 3 is closed and cam 2 may run freely so that when wire 7 or wire 6, respectively, is pulled, the trolley will be moved. When lifting or lowering a load by means of the hoisting drum 4, oil motors 9 and 10 are coupled together on the hudraulic side, and these will control each other's speed so that pulling on wires 6 and 7 will turn cam 1 and 2 in the same direction with equal speed, and the trolley will then stand still whilst the hoisting drum 4 is moved for lifting or lowering a load 8.
The valves between oil motors 9 and 10 may be closed or opened by means of radio control.
The coupling of the hydraulic system between oil motors 9 and 10 is schematically illustrated on Figure 2, where the controllable valve is indicated with reference numeral 13. Reference numeral 11 designates an oil tank, and reference numeral 12 indicates check valves.

Claims

A trolley for cableways having a wire passing via an end sheave via the trolley and back to the winch, characterized in that the pulling wire (7) and the return wire (6) pass one time around two respective cams (1, 2), which are drive-coupled with each other, and that the one cam (1) is drive-coupled with a lifting/lowering device for a load (8).
A trolley according to claim 1, characterized in that the drive-coupling between the cams (1, 2) is formed by oil motors (9, 10) connected with the cams, said oil motors (9, 10) being coupled together (3) on the hydraulic side.
A trolley according to claims 1-2, characterized in that a valve (13) is provided in both lines (3) to the oil motors (9, 10), which valve may be closed or opened to the flow of oil.
A trolley according to claims 1-3, characterized in that said valve (13) is arranged to be controlled via a radio control.
A trolley according to claims 1-4, characterized in that the drive-coupling between the lifting/lowering apparatus in the form of a hoisting drum (4) is formed by a drive chain connected with the cam (1).