GB2551773A - A Column set - Google Patents

A Column set Download PDF

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Publication number
GB2551773A
GB2551773A GB1611358.1A GB201611358A GB2551773A GB 2551773 A GB2551773 A GB 2551773A GB 201611358 A GB201611358 A GB 201611358A GB 2551773 A GB2551773 A GB 2551773A
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United Kingdom
Prior art keywords
column
connection assembly
release mechanism
counterbalance
formation
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Withdrawn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
GB1611358.1A
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GB201611358D0 (en
Inventor
Humphreys Gordon
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.)
Abacus Lighting Ltd
Original Assignee
Abacus Lighting Ltd
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 Abacus Lighting Ltd filed Critical Abacus Lighting Ltd
Priority to GB1611358.1A priority Critical patent/GB2551773A/en
Publication of GB201611358D0 publication Critical patent/GB201611358D0/en
Publication of GB2551773A publication Critical patent/GB2551773A/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/18—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures movable or with movable sections, e.g. rotatable or telescopic
    • E04H12/187—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures movable or with movable sections, e.g. rotatable or telescopic with hinged sections

Abstract

The set includes first and second columns (6 fig.4a) each having an engagement formation 6c and a release mechanism for moving the columns between upright and lowered configurations, and a counterbalance (7, fig.4a) having a connection assembly 71a, 72a, 75a for engaging with the engagement formations, the release mechanism of the first column being operable when engaged with the counterbalance, and the release mechanism of the second column being inoperable when engaged with the counterbalance. Each column may have an opening 6d for providing access to its release mechanism. The connection assembly may have openings 74a which provide access to the release mechanism when engaged with the first column and which prevent access to the release mechanism when engaged with the second column. The engagement formations may include protruding trunnions. The connection assembly may have a hook-shaped formation 75a. The release mechanism may be operated by a key inserted through the openings.

Description

(71) Applicant(s):
Abacus Lighting Limited
Oddicroft Lane, SUTTON-IN-ASHFIELD,
Nottinghamshire, NG17 5FT, United Kingdom (56) Documents Cited:
WO 2000/063512 A1 AU 000494746 B2
WO 1994/023161 A1 US 5899651 A (58) Field of Search:
INT CL E04H, F21V Other: EPODOC, TXTA, WPI (72) Inventor(s):
Gordon Humphreys (74) Agent and/or Address for Service:
Forresters IP LLP
Rutland House, 148 Edmund Street, BIRMINGHAM, B3 2JA, United Kingdom (54) Title of the Invention: A Column set
Abstract Title: Columns and counterbalance set (57) The set includes first and second columns (6 fig.4a) each having an engagement formation 6c and a release mechanism for moving the columns between upright and lowered configurations, and a counterbalance (7, fig.4a) having a connection assembly 71a, 72a, 75a for engaging with the engagement formations, the release mechanism of the first column being operable when engaged with the counterbalance, and the release mechanism of the second column being inoperable when engaged with the counterbalance. Each column may have an opening 6d for providing access to its release mechanism. The connection assembly may have openings 74a which provide access to the release mechanism when engaged with the first column and which prevent access to the release mechanism when engaged with the second column. The engagement formations may include protruding trunnions. The connection assembly may have a hook-shaped formation 75a. The release mechanism may be operated by a key inserted through the openings.
Figure GB2551773A_D0001
At least one drawing originally filed was informal and the print reproduced here is taken from a later filed formal copy.
1/3
09 17
Figure GB2551773A_D0002
Figure GB2551773A_D0003
Figure 1a Figure 1b
2/3
09 17
Figure GB2551773A_D0004
Figure 3b
3/3
09 17
Figure GB2551773A_D0005
Figure 5b
Title: A column set
Description of Invention
Embodiments of this invention relate to a column set including at least two columns (such as those utilised to support an appliance, e.g. lighting apparatus, imagery recording apparatus or signage) and a counterbalance apparatus to assist in raising and lowering a selected one of the columns.
It is known in the art to raise and lower columns of the type where the upper column part is pivotably connected to a lower column part at or near to the base of the column. Columns of this type are known in the art as being of the “base-hinged” type. It is advantageous to be able to raise and lower a column this way, for example, in order to service or replace an appliance (be it lighting apparatus, imagery recording apparatus or signage) located at or approximate to the uppermost end of the upper column part.
United States patent 5,899,651 discloses a counterbalance apparatus to assist in raising and lowering such a column. The column includes an upper column part pivotably connected to a lower column part, so that the upper column part can be rotated relative to the lower column part about a pivot axis. Since an upper column part can be heavy (and hence dangerous) for an engineer alone to support it is often necessary for the engineer to utilise a counterbalance apparatus to provide adequate support for the upper column part during raising and lowering operations. In particular, the counterbalance apparatus is engageable with the column such that a counterbalance of the counterbalance apparatus supports the upper column part as it is moved by the engineer between a generally upright configuration and a generally lowered configuration. The counterbalance apparatus therefore ensures that there can be no sudden fall of the upper column part during raising and lowering operations, thereby minimising potential injury and/or damage.
Columns come in different sizes and weights. Clearly, a light duty column (for example weighing from 25 to 40 kgs) requires a counterbalance apparatus appropriately matched to the weight of the light duty column. Similarly, a heavy duty column (for example weighing from 120 to 185 kgs) requires a counterbalance apparatus appropriately matched to the weight of the heavy duty column. Consequently, each prior art column is assigned a counterbalance apparatus having a counterbalance that is appropriately matched to the column so as to support the weight thereof.
Figure 1a shows a light duty column 1 and an appropriately matched counterbalance apparatus 3 of the prior art.
The light duty column 1 has an upper column part 1a that is pivotably connected to a lower column part 1 b. The light duty column 1 has a formation 1c and a release mechanism (not shown) which is operable to allow the upper column part 1a to be undocked from the lower column part 1b, to permit movement of the column 1 between a generally upright configuration and a generally lowered configuration (only the generally upright configuration is shown in the figures). The formation 1c typically includes a protrusion (e.g. a trunnion) protruding from the light duty column 1. A second formation protrudes from the opposite side of the light duty column 1 to the one that is shown. The or each formation 1c defines an opening 1d in the light duty column 1 through which a key (not shown) can be inserted. The opening 1d leads to a passageway which extends through the interior of the light duty column 1. The passageway may extend the whole way through the light duty column 1, e.g. from one opening 1d to the other. Alternatively, the passageway may extend partway through the light duty column 1, e.g. the passageway may terminate at a location between the two openings 1d. The passageway is configured to receive the key. The passageway also defines the pivot axis about which the upper column part 1a can pivot about the lower column part 1b.
The counterbalance apparatus 3 includes a connection assembly 3a and a counterbalance 3b. The connection assembly 3a includes first and second arms 31a, 32a which can pivot relative to each other about a connecting part 33a. The ends of the first and second arms 31a, 32a remote from the connecting part 33a are attached to the counterbalance 3b. The connecting part 33a defines an opening 34a. The connection assembly 3a also includes a formation 35a. The formation 35a of the connection assembly 3a is configured to engage a respective formation 1c of the light duty column 1. When the formation 35a of the connection assembly 3a is engaged with the formation 1c of the light duty column 1 the opening 34a of the connection assembly 3a aligns with the opening 1d of the light duty column 1, such that a key can be inserted through the openings 34a, 1d and into the passageway of the light duty column 1 in order to actuate the release mechanism.
It is to be appreciated that the counterbalance 3 includes a further (identical) connection assembly for connecting with the second formation 1c of the light duty column 1. The further connection assembly is not visible in the figures since it is located directly behind the connection assembly 3a.
In use, the counterbalance apparatus 3 is mounted to the light duty column 1 by engaging each formation 35a with a respective formation 1c of the light duty column 1. As described, the light duty column 1 and counterbalance apparatus 3 are configured such that when the formations 35a of the counterbalance apparatus 3 engage with respective formations 1c of the light duty column 1 the openings 34a, 1d become aligned such that an engineer can operate the light duty column’s 1 release mechanism by inserting a key into the passageway. Operation of the release mechanism causes undocking of the upper and lower parts 1a, 1b to permit safe lowering of the upper part 1a, since the counterbalance 3b supports the weight of the upper column part 1a as it is lowered and raised. Operation of a release mechanism is described in United States patent 5,899,651 and therefore no further detailed explanation is required.
Figure 1b shows a heavy duty column 2 and an appropriately matched counterbalance apparatus 4 of the prior art.
The heavy duty column 2 includes an upper column part 2a, a lower column part 2b and a formation 2c. The formation 2c typically includes a protrusion (e.g. a trunnion) protruding from the heavy duty column 2. A second formation protrudes from the opposite side of the heavy duty column 2 to the one that is shown. The or each formation 2c defines an opening 2d in the heavy duty column 2 through which a key (not shown) can be inserted. The opening 2d leads to a passageway which extends through the interior of the heavy duty column 2. The passageway may extend the whole way through the heavy duty column 2, from one opening 2d to the other. Alternatively, the passageway may extend partway through the heavy duty column 2, e.g. the passageway may terminate at a location between the two openings 2d. The passageway is configured to receive the key. The passageway also defines the pivot axis about which the upper column part 2a can pivot about the lower column part 2b.
The counterbalance apparatus 4 includes a connection assembly 4a and a counterbalance 4b. The connection assembly 4a includes first and second arms 41a, 42a which can pivot relative to each other about a connecting part 43a. The ends of the first and second arms 41a, 42a remote from the connecting part 43a are attached to the counterbalance 4b. The connecting part 43a defines an opening 44a. The connection assembly 4a also includes a formation 45a. The formation 45a of the connection assembly 4a is configured to engage a respective formation 4c of the heavy duty column 2. When the formation 45a of the connection assembly 4a is engaged with the formation 2c of the heavy duty column 2 the opening 44a of the connection assembly 4a aligns with the opening 2d of the heavy duty column 2, such that a key can be inserted through the openings 44a, 2d and into the passageway of the heavy duty column 2 in order to actuate the column’s 2 release mechanism.
It is to be appreciated that the counterbalance 4 includes a further (identical) connection assembly for connecting with the second formation 2c of the heavy duty column 2. The further connection assembly is not visible in the figures since it is located directly behind the connection assembly 4a.
The heavy duty column 2 and counterbalance apparatus 4 operate in the same way as described above with respect to the light duty column 1 and counterbalance apparatus 3.
A problem with this existing technology is that the formations 1c, 2c of the respective light and heavy duty columns 1, 2 have the same shape and dimensions as each other and the formations 35a, 45a of the respective counterbalance apparatus 3, 4 have the same shape and dimensions as each other. This means that it is possible for an engineer to inadvertently use an inappropriate counterbalance apparatus 3, 4. For instance, using this existing technology it is possible for the engineer to fit the counterbalance apparatus 3 (which is appropriately matched to the light duty column 1) to the heavy duty column 2. Clearly, doing so could result in potential injury and/or damage because the counterbalance 3b of the counterbalance apparatus 3 is not matched to support the weight of the upper column part 2a of the heavy duty column 2.
There is a need, therefore, to provide column sets (which include columns and associated counterbalancing apparatus) that are safer to use.
Embodiments of the invention provide a column set that seeks to overcome, or at least substantially reduce, the disadvantages discussed above.
In one aspect of the invention, we provide a column set including:
a first column having an engagement formation and a release mechanism which is operable to allow the first column to be moved between a generally upright configuration and a generally lowered configuration;
a counterbalance apparatus having a counterbalance and a connection assembly, whereby the connection assembly is engageable with the engagement formation of the first column such that when the release mechanism is operated the counterbalance supports the first column as the first column is moved between the generally upright configuration and the generally lowered configuration; and a second column having an engagement formation and a release mechanism which is operable to allow the second column to be moved between a generally upright configuration and a generally lowered configuration, whereby the release mechanism of the second column is inoperable when the connection assembly of the counterbalance apparatus is engaged with the engagement formation of the second column.
The first and/or second column(s) may define an opening for providing access to the respective release mechanism(s).
The connection assembly may define an opening.
The connection assembly may include a formation for engaging the engagement formation of the first and/or second column(s).
The opening of the connection assembly and the opening of the first column may be configurable to provide access to the release mechanism of the first column when the connection assembly is engaged with the engagement formation of the first column, and the opening of the connection assembly and the opening of the second column may be configurable to prevent access to the release mechanism of the second column when the connection assembly is engaged with the engagement formation of the second column. For instance, the openings of the connection assembly and the first column may be configured to align so as to provide access to the release mechanism of the first column when the connection assembly is engaged with the engagement formation of the first column, and the openings of the connection assembly and the second column may be configured to be offset with respect to one another so as to prevent access to the release mechanism of the second column when the connection assembly is engaged with the engagement formation of the second column.
The engagement formation of the first and/or second column(s) may include a protrusion protruding from the respective column(s).
The engagement formation of the first and/or second column(s) may include a trunnion, e.g. having a generally cylindrical configuration. Alternatively, the engagement formation of the first and/or second column(s) may be in the form of a polygon, such as a triangle (e.g. an equilateral triangle), a rectangle (e.g. a square) and so forth.
The formation of the connection assembly may include a hook-shaped part.
Alternatively, the engagement formation of the first and/or second column(s) may include a hook-shaped part and the formation of the connection assembly may include a protrusion or trunnion.
The counterbalance apparatus may include one or more further connection assemblies.
The first and/or second column(s) may include one or more further engagement formations.
The column set may include one or more further columns and/or one or more further counterbalance apparatus.
Embodiments of the various aspects of the invention will now be described by way of example only and with reference to the accompanying drawings, of which:
Figures 2a and invention; Figures 3a and invention; Figures 4a and invention; and Figures 5a and invention.
2b show components
3b show components
4b show components
5b show components of a column of a column of a column of a column set according to the set according to the set according to the set according to the
Referring to figures 2-5, there are shown component parts of a column set according to the invention.
Figures 2a and 2b show a light duty column 5 and a corresponding counterbalance apparatus 7. The light duty column 5 has an upper column part 5a that is pivotably connected to a lower column part 5b. The light duty column 5 has a formation 5c and a release mechanism (not shown) which is operable to allow the upper column part 5a to be undocked from the lower column part 5b, to permit movement of the light duty column 5 between a generally upright configuration and a generally lowered configuration. The formation 5c may include a trunnion protruding from the light duty column 5. In some embodiments, a second formation may protrude from the opposite side of the light duty column 5 to the one that is shown. In some embodiments, the or each formation 5c may define an opening 5d in the light duty column 5 through which a key (not shown) can be inserted. The opening 5d leads to a passageway which extends through the interior of the light duty column 5. The passageway is configured to receive the key. In some embodiments, the passageway may define the pivot axis about which the upper column part 5a can pivot about the lower column part 5b.
The counterbalance apparatus 7 includes a connection assembly 7a and a counterbalance 7b. The counterbalance 7b may include a spring for supporting the weight of the upper column part 5a, although in some embodiment the counterbalance 7b may instead include a hydraulic or pneumatic ram. The connection assembly 7a may include first and second arms 71a, 72a which can pivot relative to each other about a connecting part 73a. The ends of the first and second arms 71a, 72a remote from the connecting part 73a are attached to the counterbalance 7b. The connecting part 73a defines an opening 74a. The connection assembly 7a also includes a formation 75a. The formation 75a of the connection assembly 7a is configured to engage a respective formation 5c of the light duty column 5. As shown in figure 2b, when the formation 75a of the connection assembly 7a is engaged with the formation 5c of the light duty column 5 the opening 74a of the connection assembly 7a aligns with the opening 5d of the light duty column 5, such that a key can be inserted through the openings 74a, 5d and into the passageway of the light duty column 5 in order to actuate the release mechanism.
Figures 3a and 3b show the light duty column 5 and a counterbalance apparatus 8. The counterbalance apparatus 8 is intended for a heavier column than the light duty column 5. The counterbalance apparatus 8 includes a connection assembly 8a and a counterbalance 8b. The counterbalance 8b may include a hydraulic ram, although in some embodiments the counterbalance 8b may instead include a pneumatic ram or a spring for supporting the upper column part 5a. In some embodiments, the connection assembly 8a may include first and second arms 81a, 82a which can pivot relative to each other about a connecting part 83a. The ends of the first and second arms 81a, 82a remote from the connecting part 83a may be attached to the counterbalance 8b. The connecting part 83a may define an opening 84a. The connection assembly 8a may include a formation 85a. The formation 85a of the connection assembly 8a is configured to engage a respective formation 5c of the light duty column 5. As shown in figure 3b, when the formation 85a of the connection assembly 8a is engaged with the formation 5c of the light duty column 5 the opening 84a of the connection assembly 8a aligns with the opening 5d of the light duty column 5, such that a key can be inserted through the openings 84a, 5d and into the passageway of the light duty column 5 in order to actuate the release mechanism. It is to be appreciated that there is a space between the formations 85a, 5c. Nevertheless, by relative adjustment of the counterbalance apparatus 8 and the light duty column 5 it is possible to align the openings 84a, 5d so as to provide access to the release mechanism of the light duty column 5. Whilst the counterbalance apparatus 8 is not ideally suited to the light duty column 5, the combination does not provide any immediate safety concerns because the counterbalance 8b is more than capable of supporting the upper column part 5a.
Figures 4a and 4b show a heavy duty column 6 and the counterbalance apparatus 7. The heavy duty column 6 has an upper column part 6a that is pivotably connected to a lower column part 6b. The heavy duty column 6 has a formation 6c and a release mechanism (not shown) which is operable to allow the upper column part 6a to be undocked from the lower column part 6b, to permit movement of the heavy duty column 6 between a generally upright configuration and a generally lowered configuration. The formation 6c may include a trunnion protruding from the heavy duty column 6. In some embodiments, a second formation may protrude from the opposite side of the heavy duty column 6 to the one that is shown. The or each formation 6c may define an opening 6d in the heavy duty column 6 through which a key (not shown) can be inserted. The opening 6d may lead to a passageway which extends through the interior of the heavy duty column 6. The passageway is configured to receive the key. The passageway may define the pivot axis about which the upper column part 6a can pivot about the lower column part 6b.
The counterbalance apparatus 7 is intended for a lighter column than the heavy duty column 6. As shown in figure 4b, when the formation 75a of the connection assembly 7a is engaged with the formation 6c of the heavy duty column 6 the opening 74a of the connection assembly 7a is offset with respect to the opening 6d of the heavy duty column 6, so as to prevent access to the release mechanism of the heavy duty column 6. Advantageously, an engineer is alerted to the fact a counterbalance apparatus having a counterbalance that is not appropriately matched to support a column is been used inadvertently.
Figures 5a and 5b show a heavy duty column 6 and the appropriately matched counterbalance apparatus 8. The heavy duty column 6 and counterbalance apparatus 8 operate in the same way as described above with respect to the light duty column 5 and the counterbalance apparatus 7.
The column set of the present invention provides a safer alternative to prior art columns and associated counterbalancing apparatus, in that an engineer is immediately alerted in the event that a counterbalance apparatus that is inappropriately matched to support the weight of a column is inadvertently engaged to the column. This invention can provide a simple and effective solution to ongoing problems concerning safety.
When used in this specification and claims, the phrase “generally upright configuration” is intended to mean that the column is erected such that the appliance (be it lighting apparatus, imagery recording apparatus or signage) adopts an intended use location.
When used in this specification and claims, the phrase “generally lowered configuration” is intended to mean that the column is at least partially collapsed such that the appliance (be it lighting apparatus, imagery recording apparatus or signage) adopts a service or replacement location.
When used in this specification and claims, the terms comprises and comprising and variations thereof mean that the specified features, steps or integers are included. The terms are not to be interpreted to exclude the presence of other features, steps or components.
The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof.

Claims (13)

Claims
1. A column set including:
a first column having an engagement formation and a release mechanism which is operable to allow the first column to be moved between a generally upright configuration and a generally lowered configuration;
a counterbalance apparatus having a counterbalance and a connection assembly, whereby the connection assembly is engageable with the engagement formation of the first column such that when the release mechanism is operated the counterbalance supports the first column as the first column is moved between the generally upright configuration and the generally lowered configuration; and a second column having an engagement formation and a release mechanism which is operable to allow the second column to be moved between a generally upright configuration and a generally lowered configuration, whereby the release mechanism of the second column is inoperable when the connection assembly of the counterbalance apparatus is engaged with the engagement formation of the second column.
2. A column set according to claim 1, wherein the first and/or second column(s) define an opening for providing access to the respective release mechanism(s).
3. A column set according to claim 1 or claim 2, wherein the connection assembly defines an opening.
4. A column set according to claim 3, when dependent on claim 2, wherein the openings of the connection assembly and the first column are configured to provide access to the release mechanism of the first column when the connection assembly is engaged with the engagement formation of the first column, and wherein the openings of the connection assembly and the second column are configured to prevent access to the release mechanism of the second column when the connection assembly is engaged with the engagement formation of the second column.
5. A column set according to any preceding claim, wherein the engagement formation of the first and/or second column(s) includes a protrusion protruding from the respective column(s).
6. A column set according to any preceding claim, wherein the engagement formation of the first and/or second column(s) includes a trunnion.
7. A column set according to any preceding claim, wherein the connection assembly includes a formation for engaging the engagement formation of the first and/or second column(s).
8. A column set according to claim 7, wherein the formation of the connection assembly includes a hook-shaped part.
9. A column set according to any preceding claim, wherein the counterbalance apparatus include one or more further connection assemblies.
10. A column set according to any preceding claim, wherein the first and/or second column(s) include one or more further engagement formations.
11. A column set according to any preceding claim including one or more further columns and/or one or more further counterbalance apparatus.
12. A column set substantially as hereinbefore described with reference to and as shown in figures 2-5.
13. Any novel feature or novel combination of features described herein and/or shown in the accompanying drawings.
Intellectual
Property
Office
Application No: GB1611358.1 Examiner: Mr Joshua Nolan
GB1611358.1A 2016-06-30 2016-06-30 A Column set Withdrawn GB2551773A (en)

Priority Applications (1)

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GB1611358.1A GB2551773A (en) 2016-06-30 2016-06-30 A Column set

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GB2551773A true GB2551773A (en) 2018-01-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU494746B2 (en) * 1975-09-04 1977-03-10 Abacus Engineering Limited Improvements in columns
WO1994023161A1 (en) * 1993-04-06 1994-10-13 Abacus Holdings Limited Raising and lowering columns
US5899651A (en) * 1997-08-19 1999-05-04 Abacus Holdings Limited Column counterbalancing apparatus
WO2000063512A1 (en) * 1999-04-20 2000-10-26 Abacus Holdings Limited Column counterbalancing apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU494746B2 (en) * 1975-09-04 1977-03-10 Abacus Engineering Limited Improvements in columns
WO1994023161A1 (en) * 1993-04-06 1994-10-13 Abacus Holdings Limited Raising and lowering columns
US5899651A (en) * 1997-08-19 1999-05-04 Abacus Holdings Limited Column counterbalancing apparatus
WO2000063512A1 (en) * 1999-04-20 2000-10-26 Abacus Holdings Limited Column counterbalancing apparatus

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