GB2188021A - Load lifting system - Google Patents

Load lifting system Download PDF

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Publication number
GB2188021A
GB2188021A GB8606958A GB8606958A GB2188021A GB 2188021 A GB2188021 A GB 2188021A GB 8606958 A GB8606958 A GB 8606958A GB 8606958 A GB8606958 A GB 8606958A GB 2188021 A GB2188021 A GB 2188021A
Authority
GB
United Kingdom
Prior art keywords
gate
sheave
cable
lifting
lowering
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.)
Withdrawn
Application number
GB8606958A
Other versions
GB8606958D0 (en
Inventor
Norman Warren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John Booth & Sons
Original Assignee
John Booth & Sons
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by John Booth & Sons filed Critical John Booth & Sons
Priority to GB8606958A priority Critical patent/GB2188021A/en
Publication of GB8606958D0 publication Critical patent/GB8606958D0/en
Publication of GB2188021A publication Critical patent/GB2188021A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F19/00—Hoisting, lifting, hauling or pushing, not otherwise provided for
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/60—Power-operated mechanisms for wings using electrical actuators
    • E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
    • E05F15/665—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for vertically-sliding wings
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/132—Doors

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Barrages (AREA)

Abstract

A lifting means for a vertically-movable gate or door (1) comprises a cable (3) attachable to a respective end of two ends of the gate or door. The cable passes over pulleys (4) and round a sheave (5) which is provided with displacement means (8) to move it up and down, thereby lowering and raising the gate. The sheave can be driven clockwise and anticlockwise to correct any inequality in level between the ends of the gate or door. <IMAGE>

Description

SPECIFICATION Improvements in or relating to lifting devices The present invention relates to a lifting device, and in particular, to a lifting device for a door or gate, including level correcting means.
It is common to have a lifting device whereby a load is raised and lowered by means of cables attached at two ends of the load and passing over a system of pulleys to means for lifting and lowering the load. In particular this kind of lifting device can be used for vertically raising and lowering doors and gates.
A common problem with such a lifting device is for the two ends of the load to fall out of level with each other which results in lack of stability of the raising and lowering movement, and undue stress on cables.
It is an object of the present invention to obviate or mitigate the abovementioned problem.
According to the present invention there are provided lifting means comprising a cable attachable to a respective end of two ends of an object to be raised and lowered, which cable passes over pulley means and round a sheave, pulley, wheel, sprocket or roiler (hereinafter simply called "a sheave"), the sheave being provided with displacement means to mve it up and down, thereby lowering and raising the object, and means to drive it clockwise and anticlockwise to correct any inequality in level between the ends of the object.
Preferably, the object is a vertically-movable gate.
The present invention will now be described by way of example, with reference to the accompanying drawings, in which: Figure l is a schematic representation of a device according to the present invention used for raising and lowering a gate; Figure 2 is a detail end view of the gate and cables of Fig. 1 as seen between arrows A-A; Figure 3 and Figure 4 are detail end views of the gate and cables similar to Fig. 2 but with two and four cables respectively.
Referring to Fig. 1, a gate 1 which has freedom of movement at each end within a vertical guide channel 2 is supported by means of a cable 3, which passes over pulleys 4 and round a sheave 5 which is attached to a counter weight 6. The counter weight 6 has freedom of movement in a substantially vertical path defined by a guide channel 7, and is fixed to an endless belt 8 which can be driven in either direction in a vertical plane. The sheave 5 is normally stationary but is capable of being rotated in either direction.
To raise the gate 1 the sheave 5 is stationary and the endless belt 8 is driven in a clockwise direction, which causes the counter weight 7 to be lowered, and hence the gate 1 to be raised.
The gate 1 is lowered by driving the belt 8 anticlockwise to raise the counter weight 6, and hence lower the gate 1. The endless belt 8 is driven by any suitable means, and in particular electro-mechanical drive means are envisaged.
If the ends of the gate 1 get out of level, levelling of the gate 1 is achieved by keeping the endless belt 8 stationary and driving sheave 5 clockwise or anticlockwise, depending on which end of the gate is lower than the other. For example, to adjust gate 1 from the position shown in dotted lines in Fig. 1 to that shown in bold lines, the sheave 5 is turned anticlockwise. The sheave 5 may be driven by any suitable means, for example by a motor or manually by means of a handle.
Referring to Figs. 3 and 4, embodiments of the present invention are shown wherein the cable 3 comprises two and four cables respectively, which pass around two and four sheaves 5 respectively.
The above example relates to an embodiment of the present invention adapted for use in raising and lowering a gate, but it will be appreciated that the present invention can be used in any situation where a load is being raised and lowered by means of a cable attached at two points on the load, and may be applied for example in cases where due to geometric limitation the points at which the cable is attached to the load are not level.
While the term "cable" is used herein it is to be understood that this is not restrictive and takes within its scope "chains" and "wire ropes".
Similarly the endless belt 8 may be in the form of a chain or other convenient endless elements.
1. Lifting means comprising a cable attachable to a respective end of two ends of an object to be raised and lowered, which cable passes over pulley means and round a sheave, which is provided with displacement means to move it up and down, thereby lowering and raising the object, and means to drive it clockwise and anticlockwise to correct any inequality in level between the ends of the object.
2. Lifting means as claimed in claim 1, in which the object is a vertically-movable gate.
3. Lifting means as claimed in claim 2, in which the gate is freely movable at each end within a vertical guide channel and is supported by a cable which passes over pulleys and round the sheave which is attached to a counterweight.
4. Lifting means as claimed in claim 3, in which the counterweight is freely movable in a substantially vertical path defined by a guide channel and is fixed to an endless belt which
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to lifting devices The present invention relates to a lifting device, and in particular, to a lifting device for a door or gate, including level correcting means. It is common to have a lifting device whereby a load is raised and lowered by means of cables attached at two ends of the load and passing over a system of pulleys to means for lifting and lowering the load. In particular this kind of lifting device can be used for vertically raising and lowering doors and gates. A common problem with such a lifting device is for the two ends of the load to fall out of level with each other which results in lack of stability of the raising and lowering movement, and undue stress on cables. It is an object of the present invention to obviate or mitigate the abovementioned problem. According to the present invention there are provided lifting means comprising a cable attachable to a respective end of two ends of an object to be raised and lowered, which cable passes over pulley means and round a sheave, pulley, wheel, sprocket or roiler (hereinafter simply called "a sheave"), the sheave being provided with displacement means to mve it up and down, thereby lowering and raising the object, and means to drive it clockwise and anticlockwise to correct any inequality in level between the ends of the object. Preferably, the object is a vertically-movable gate. The present invention will now be described by way of example, with reference to the accompanying drawings, in which: Figure l is a schematic representation of a device according to the present invention used for raising and lowering a gate; Figure 2 is a detail end view of the gate and cables of Fig. 1 as seen between arrows A-A; Figure 3 and Figure 4 are detail end views of the gate and cables similar to Fig. 2 but with two and four cables respectively. Referring to Fig. 1, a gate 1 which has freedom of movement at each end within a vertical guide channel 2 is supported by means of a cable 3, which passes over pulleys 4 and round a sheave 5 which is attached to a counter weight 6. The counter weight 6 has freedom of movement in a substantially vertical path defined by a guide channel 7, and is fixed to an endless belt 8 which can be driven in either direction in a vertical plane. The sheave 5 is normally stationary but is capable of being rotated in either direction. To raise the gate 1 the sheave 5 is stationary and the endless belt 8 is driven in a clockwise direction, which causes the counter weight 7 to be lowered, and hence the gate 1 to be raised. The gate 1 is lowered by driving the belt 8 anticlockwise to raise the counter weight 6, and hence lower the gate 1. The endless belt 8 is driven by any suitable means, and in particular electro-mechanical drive means are envisaged. If the ends of the gate 1 get out of level, levelling of the gate 1 is achieved by keeping the endless belt 8 stationary and driving sheave 5 clockwise or anticlockwise, depending on which end of the gate is lower than the other. For example, to adjust gate 1 from the position shown in dotted lines in Fig. 1 to that shown in bold lines, the sheave 5 is turned anticlockwise. The sheave 5 may be driven by any suitable means, for example by a motor or manually by means of a handle. Referring to Figs. 3 and 4, embodiments of the present invention are shown wherein the cable 3 comprises two and four cables respectively, which pass around two and four sheaves 5 respectively. The above example relates to an embodiment of the present invention adapted for use in raising and lowering a gate, but it will be appreciated that the present invention can be used in any situation where a load is being raised and lowered by means of a cable attached at two points on the load, and may be applied for example in cases where due to geometric limitation the points at which the cable is attached to the load are not level. While the term "cable" is used herein it is to be understood that this is not restrictive and takes within its scope "chains" and "wire ropes". Similarly the endless belt 8 may be in the form of a chain or other convenient endless elements. CLAIMS
1. Lifting means comprising a cable attachable to a respective end of two ends of an object to be raised and lowered, which cable passes over pulley means and round a sheave, which is provided with displacement means to move it up and down, thereby lowering and raising the object, and means to drive it clockwise and anticlockwise to correct any inequality in level between the ends of the object.
2. Lifting means as claimed in claim 1, in which the object is a vertically-movable gate.
3. Lifting means as claimed in claim 2, in which the gate is freely movable at each end within a vertical guide channel and is supported by a cable which passes over pulleys and round the sheave which is attached to a counterweight.
4. Lifting means as claimed in claim 3, in which the counterweight is freely movable in a substantially vertical path defined by a guide channel and is fixed to an endless belt which can be driven in either direction in a vertical plane.
5. Lifting means, substantially as hereinbefore described with reference to the accompanying drawing.
GB8606958A 1986-03-20 1986-03-20 Load lifting system Withdrawn GB2188021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8606958A GB2188021A (en) 1986-03-20 1986-03-20 Load lifting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8606958A GB2188021A (en) 1986-03-20 1986-03-20 Load lifting system

Publications (2)

Publication Number Publication Date
GB8606958D0 GB8606958D0 (en) 1986-04-23
GB2188021A true GB2188021A (en) 1987-09-23

Family

ID=10594960

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8606958A Withdrawn GB2188021A (en) 1986-03-20 1986-03-20 Load lifting system

Country Status (1)

Country Link
GB (1) GB2188021A (en)

Also Published As

Publication number Publication date
GB8606958D0 (en) 1986-04-23

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)