AU2015213352B2 - Power distribution device - Google Patents

Abstract

Abstract A power distribution device for distributing an electrical power supply from a power supply bar to a take-off point, the device comprising: a housing containing the power 5 supply bar; at least one power take-off point for providing electrical power to a circuit breaker when coupled thereto; and a carriage disposed within the housing, the carriage configured to move between an operative position where electrical contact is maintained 10 between the power supply bar formed and the take-off point, and an inoperative position where the power supply bar is isolated from the take-off point, wherein the carriage is moved into the inoperative position to isolate the take-off point, to allow removal of the circuit 15 breaker from the device without the need to disconnect electrical power supply to the power supply bar. 67784261 (GHMatters) P97540.AU.1 KERRYD 12/08/15 -77777 '444

Description

The invention relates to a power distribution device 5 and in particular to an electricity distribution device for distributing and isolating electricity from a mains supply to a circuit breaker.

Background

Distribution boards are traditionally used to allocate mains electricity supply to a bank of circuit breakers that subsequently provide controlled take-off points to distribute the mains supply.

The safe use of such distribution boards has resulted in the development of a range of switching mechanisms to isolate the mains electricity supplied to the distribution prior to fitting circuit breakers to the board. To date, such switching mechanisms include a range of means to ensure contact with live parts of the distribution board is prevented when circuit breakers are installed or removed. However, such safety systems involved the switching off or isolating of the entire distribution board from the mains electricity supply. Such total isolation of a large distribution board servicing a wide range of electric outlets was potentially inconvenient as the entire system would need to be isolated and switched off before a single circuit breaker could be serviced.

In response to such problems a range of isolation mechanisms have been developed to allow isolation of a single take-off point of a distribution board thereby allowing servicing of an individual circuit breaker fitted to a multiple capacity distribution board.

One example of such prior art is found in Australian

Patent 2011 202133.

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As such it is desirable to provide an electricity distribution device having additional isolation and safety protection features.

Summary of the invention

The invention in broad terms provides a power distribution device for distributing an electrical power supply from a power supply bar to a plurality of take-off points, the device comprising: a housing containing the power supply bar; and a plurality of power take-off points, each power take-off point providing: electrical power to a circuit breaker when coupled thereto; and an internal carriage disposed within the housing, the carriage supporting an electric contact thereon and being configured to move internally of the housing to transition the contact between an operative position where the electric contact forms an electrical connection between the power supply bar and the take-off point, and an inoperative position where the electric contact breaks the electrical connection with the power supply bar isolating the power supply bar from the take-off point, wherein movement of the internal carriage and the electric contact between the operative and inoperative positions is effected from an exterior of the housing, such that any one of the plurality of take-off points can be individually isolated from the power supply bar, to allow removal of the respective circuit breaker from the device while each of the remaining of the plurality of take-off points maintains the operative position in connection with the power supply bar.

In more narrow terms, the invention provides a device for distributing electric power from a mains power supply via an isolation contact to a range of electric circuit breakers said device including an electric circuit breaker

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 chassis comprising a housing adapted to receive one of more electricity supply bars and one or more circuit breakers, said housing including a circuit breaker docking station to physically and electrically co-operate with a range of circuit breakers said docking station including an electric take-off output having a take- off shroud adapted to move between a first extended position covering said take-off and a second retracted position exposing said take-off, an electric contact adapted to move between a first isolating position isolating said take-off and said supply bar and a second position bridging said takeoff and said supply bar, a circuit breaker cover plate adapted to move between a first retracted position within said housing and a second extended position covering the screw hole of said circuit breaker wherein said contact and said cover are mounted on a slider carriage fitted within said housing said slider being adapted to move between a first position isolating said fitted contact from said take-off and electricity supply bar and simultaneously retracting said cover within the confines of said housing and a second position bridging said takeoff and electricity sully bar and releasing said cover wherein said chassis further includes an interlock latch adapted to move between a first position locking the movement of said slider from said first isolating position and a second position allowing said slider to move to said second contact position wherein said interlock latch moves to said second position by co-operation with said take-off shroud such that said interlock latch only releases said slider when said take-off shroud is retracted into said housing .

In one embodiment the device may include the circuit breaker cover having variable height adjustment to accommodate a range of circuit breakers which can be docked to the device.

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2015213352 04 Sep 2018

The housing of the device may include an access port to allow access to the internally positioned slider.

The slider may include a tool engaging means which can be in the form of a slot which is adapted to receive the tool inserted through the access port and therein able to activate the slider for movement between the first and second positions .

In another embodiment the circuit breaker cover may be slidably fitted to the slider carriage and adapted for transverse movement relative to the slider carriage such that the lateral movement of the slider in combination with the transverse movement of the cover fitted to said slider provides a combined movement of the cover between a first retracted position and a second extended position to include the above detailed variable height adjustment.

In a still further embodiment the interlock latch may be pivoted to the housing for movement between the first locking position and the second release position with the latch including a release slot adapted to co-operate with the release pin fitted to the take-off shroud and a keeper portion adapted to co-operate with the slider carriage and prevent movement thereof when the interlock latch is in the locked position.

Brief description of the drawings

The invention will now be described in greater detail with reference to one particular embodiment as shown in figures 1 to 16 and the associated legend, in which:

Fig 1 shows the chassis of the device according to one embodiment of the invention, in side view crosssection .

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2015213352 04 Sep 2018

Fig	2	shows	the	chassis	in isometric view	cross-
section .
Fig	3	shows	the	chassis	in isometric cut-	away view.
Fig	4	shows	the	chassis	with a single circuit breaker
fitted and	not activated.
Fig	5	shows	the	use of	a tool to activate	the slider
and fitted	electric	contact	and cover plates.
Fig	6	shows	partial activation as the slider

commences movement.

Fig 7 shows further activation as the slider bridges the electric contact.

Fig 8 shows completed activation as the slider causes the cover to fully extend and move transversely to allow for height adjustment to accommodate the docked circuit breaker.

Fig 9 shows the disengagement by reverse movement of the slider.

Fig 10 shows full return of the slider.

Fig 11 shows release and removal of an individual 20 circuit breaker.

Fig 12 shows detail of the interlocking latch.

Figs 13 to 16 show detail of the slider carriage, contact, cover and interlock latch.

5 Legend

1 .	Circuit Breaker Chassis
2 .	Housing
2a.	Lower Housing
3 .	Electricity Supply Bar(s)
4 .	Circuit Breaker (s)
5 .	Docking Station
6 .	Take-Off Output
7 .	Take-Off Shroud
8 .	Electric Contact
9 .	Cover Plate
10 .	Screw Hole

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2015213352 04 Sep 2018

11. Slider Carriage

12. Interlock Latch

13. Access Port

14. Tool Engaging Means

15. Pivot

16. Release Slot

17. Release Pin

18. Keeper Portion

19. Tool

20. Screw

21. Nut

22. Main Bar Take-Off

23. Barrier

24. Cover spring

25. Take-Off Shroud Spring

Detailed description

Referring now to the figures and accompanying legend one embodiment of the invention will now be described.

Referring firstly to figures 1 to 3, the device of the invention is shown in side cross-section view in figure 1 and in isometric cross-section view in figure 2 as a dual sided device for distributing electric power and being interposed between the electricity supply and circuit breakers fitted thereto for controlling and distributing electric power. The dual sided embodiment repeats the features on either side with each side being set in the respective resting (first) and active (second) positions. The device of the embodiment includes an electric circuit breaker chassis 1 which comprises a main housing 2 being formed to receive and contain all the component parts of the device and being adapted for attachment to an electricity supply box or the like. In some embodiments, the housing further comprises a lower housing 2a, removably coupled to the main housing 2 by a plurality of screws 20 and retaining nuts 21.

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2015213352 04 Sep 2018

On the lower side the housing includes one or, in the case of one particularly preferred embodiment, two points for receiving electricity supply bars 3 which run along the underneath of the chassis 1 and have upwardly projecting tabs adapted to receive and engage the housing 2 and chassis 1 when fitted to the supply box. Each of the supply bars 3 can be connected with a main take-off 22 than extends within a central portion of the housing 2.

The housing 2 further includes a region adapted to receive and engage circuit breakers 4 with that portion of the housing comprising a circuit breaker docking station 5. Again, in the example of the embodiment shown in the figures the circuit breaker chassis includes dual circuit breaker docking stations on either side of the housing.

The circuit breaker docking station 5 is adapted to physically receive and engage circuit breakers 4 either side thereof and also adapted to electrically co-operate by way of electric take-off outputs 6 projecting outwardly from the main housing 2. Again, in the case of the embodiments detailed herein twin electric take-off output 6 are positioned either side of the main housing to accommodate two circuit breakers either side.

Each electric output 6 is provided with a take-off shroud or cover 7 wherein the take-off shroud 7 is adapted to move between a first extended position projecting outward from the housing and serving to fully cover the take-off output 6 with the shroud being biased by way of a spring 25 or other biasing means to adopt the first extended position covering the electric take off 6 and a second retracted position exposing the take-off 6 whereby the second positioned is achieved only by the physical movement of the take-off shroud 7 against the bias with the shroud 7 being actively pushed into the confines of

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 the housing 2 to expose the electric take-off output 6.

The electric circuit breaker chassis 1 further includes an electric contact 8 which is adapted to move in a laterally sliding action across the width of the housing between a first position co-operating with the electricity supply bar 3, but being isolated from the electric take-off output 6 and a second position bridging the take-off and the supply bar so as to supply continuity and power from the electricity supply bar 3 to the electric take-off output 6 and hence to supply electric power to a docked circuit breaker 4.

The chassis 1 further includes a circuit breaker cover plate 9 which is adapted to move between a first retracted position where the cover plate 9 is substantially retracted within the confines of the housing 2 and a second extended position with the cover plate 9 extended outwardly from the housing 2 so as to cover the screw hole 10 of a fitted circuit breaker 4 as shown in figure 4.

In order to co-ordinate and control the movement of the contact 8 and the cover 9, both the contact 8 and cover 9 are mounted on a slider carriage 11 which is fitted entirely within the housing 2 with the slider carriage 11 being adapted to move between a first position physically isolating the fitted contact 8 and the electricity supply bar 3, from an internal portion of the electric take-off output 6. In a particularly preferred embodiment as detailed in figures 1 and 2, the contact 8 has a portion that slidably moves back and forth along an internal portion of the main bar take-off 22 in a manner maintaining contact with the main bar take-of 22, but the sliding action allows the contact 8 to be isolated or contacted with the electric take-off output 6 as the slider carriage 11 is moved from the first isolating

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 position to the second position bridging the take-off 6 and main bar take-off 22 and thereby forming a connection to the electricity supply bar 3. The slider carriage 11 simultaneously controls the movement of the cover 9 causing the cover 9 to be withdrawn or projected in accordance with the movement of the slider carriage 11.

When the cover 9 is retracted into the housing 2, a barrier 23 is slid into place on a side of the housing 2 to prevent access into the housing 2 when no circuit breaker 4 is loaded into the dock 5. A return spring 24 is coupled to the cover 9 to assist in retracting the cover 9 from the extended position into the retracted position within the housing 2.

Figure 1 further illustrates the housing 2 having two identical, mirrored circuit breaker docking stations 5 arranged on opposing sides of the housing 2 for receiving two circuit breakers 4. The slider carriage 11 illustrated in Figure 1 controls the movement of cover 9 and an identical slider carriage 11' is disposed in contact with a second portion of the main bar take-off 22 to move a cover 9'. As such figure 1 illustrates the slider carriage 11' in the first, isolating position and the second slider carriage 11 in the second position bridging the take-off output 6 and main bar take-off 22, where the cover 9 is fully extending from the housing 2. This arrangement of chassis 1 allows for either of the take-off point 6 or an opposing take-off point 6' to be independently isolated from the power supply bar 3.

In order to provide the safety features of this embodiment the movement of the slider carriage 11 and hence the selection of electric isolation or electric contact is controlled by an interlock latch 12 incorporated within the confines of the chassis 1. The interlock latch 12 is adapted to move between a first

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 position locking movement of the slider 11 from its first isolating position and a second position allowing the slider 11 to move to the second contact position. The interlock latch 12 is pivotally fitted 15 to the housing 2 and operates under a bias in the form of a spring or other biasing means such that the interlock latch 12 adopts a locking position by default in the first locking position and only moves to the second position allowing the slider to establish electric contact when the interlock latch 12 moves to its second position which only occurs by cooperation with the movement with the take-off shroud 7 being drawn into the confines of the housing 2.

The circuit breaker cover 9 is particularly adapted to provide variable height adjustment to as to accommodate a wide range of available circuit breakers for docking into the chassis 1. The variable height is achieved by the slider 9 including transverse movement up and down the cover carriage 11 with the height adjustment movement being biased for downward movement once the lateral movement of the carriage 11 has projected the cover 9 out from the housing 2 to the second extended position such that the cover 9 moves outward upon activation of the slider carriage 11 from the main housing 2 and once the slider cover 9 has projected substantially from the housing 2 the second transverse movement of the cover 9 down under the action of the bias causes the cover 9 to sit snugly on top of a docked circuit breaker 4 thereby ensuring the screw hole 10 of a docked circuit breaker 4 is properly covered and protected.

In this manner the device of the invention prevents the electric take-off output 6 from being rendered live unless the take-off shroud 7 has been actively withdrawn into the housing 2 by way of docking of a circuit breaker 4. Hence, in this capacity the electric take-off outputs

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 remain safe and incapable of electrocuting a user whilst the take-off shroud 7 is in the first outwardly projecting position .

In order to provide additional protection and security from inadvertent use the embodiment as currently detailed includes an additional safety features whereby the slider carriage 11 is wholly contained within the housing 2 of the chassis 1 and cannot be moved to the contact position even with the circuit breaker 4 docked unless a tool 19 is inserted into the top of the housing 2 so as to activate the slider 11. In this manner the embodiment further includes an access port 13 positioned on the top of a housing 2 and in addition the slider carriage 11 includes a tool engaging means 14 which is adapted to receive a tool 19 inserted into the access port specifically for the purposes of drawing the slider carriage 11 between its first and second positions.

In use the device of the invention is shown with reference to figure 4 by the insertion of a circuit breaker 4 to the docking station or region 5 of the housing 2. The circuit breaker 4 as shown on the left hand side of the chassis 1 in figure 2 has been inserted into the docking station 5 and the physical insertion of the circuit breaker 4 physically moves the take-off shroud to a second retracted position so as to allow the circuit breaker to electrically engage the subsequently exposed electric take-off output 6. The movement of the shroud 7 to the second position rotates the interlock latch 12 by rotation about the pivot 15 so as to lower the keeper portion 18 of the latch to a lowered position thereby freeing up the slider carriage 11 for movement. However, the sider carriage 11 includes the additional safety feature of being totally contained within the confines of the housing 2 and can only be moved to a

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 position causing electric contact to be established by the use of the tool 19.

Referring now to figure 5 the tool can take the form 5 of a simple screwdriver, but nevertheless requires a deliberate insertion of the tool 19 through the access port 13 found on the top of the housing 2. Figure 6 shows the insertion of the tool 19 through the access port 13 whereby the tool 19 can then co-operate with the tool engaging means 14 of the slider 11.

As shown in figure 7 the tool 19 can then be used to withdraw the slider carriage 11 from the first to the second position carrying with it the contact 8 and cover 9 such that the contact 8 is then caused to bridge the main bar take-off 22 and the internal portion of the electric take-off output 6. The simultaneous establishment of the electric contact, and the movement of the cover 9 projecting outwards from the housing 2, is then followed as shown in figure 8, by second transverse downward movement of the cover 9 to sit snugly on top of and to completely protect the screw hole 10 of the fitted circuit breaker 4. The combined lateral and transverse movements of the cover 9 allow this embodiment of the invention to accommodate a wide range of circuit breaker 4 irrespective of the physical dimensions of the circuit breaker 4.

In this manner the invention provides dual protection against inadvertent electric shock with the insertion and removal of circuit breakers from an electric distribution board.

Figures 9 through to 11 show the reverse action of disengagement where the tool 19 is again inserted into the access port 13 of the chassis so as to withdraw the slider carriage 11 and simultaneously withdraw the cover 9 and

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2015213352 04 Sep 2018

- 13 contact 8 so as to entirely electrically isolate the circuit breaker as shown in figure 10 so as to allow safe disengagement and removal of the circuit breaker from a device of the invention as shown in figure 11.

Further detail of the operation of the embodiment is shown in figures 12 through to 16 where details of the interlock latch 12, slider carriage 11, cover 9 and contact 8 are shown in isolation from the main housing 2 for the purposes of clarity.

For the first time, the embodiment of the invention detailed above allows for multiple layers of protection and safety during the servicing, insertion and removal of circuit breakers whereby the twin action of physical insertion of a circuit breaker and deliberate insertion and use of a tool are both required in order to establish electric contact thereby greatly reducing the chances of any inadvertent electrocution in the normal operation of these types of devices.

It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word comprise or variations such as comprises or comprising is used in an inclusive sense,

i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

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2015213352 04 Sep 2018

Claims (16)

1 . A power distribution device for distributing an electrical power supply from a power supply bar to a

5 plurality of take-off points, the device comprising:

a housing containing the power supply bar; and a plurality of power take-off points, each power take-off point providing:

electrical power to a circuit breaker when

10 coupled thereto; and an internal carriage disposed within the housing, the carriage supporting an electric contact thereon and being configured to move internally of the housing to transition the contact between an

15 operative position where the electric contact forms an electrical connection between the power supply bar and the take-off point, and an inoperative position where the electric contact breaks the electrical connection with the power supply bar isolating the

20 power supply bar from the take-off point, wherein movement of the internal carriage and the electric contact between the operative and inoperative positions is effected from an exterior of the housing, such that any one of the plurality of take-off points can

25 be individually isolated from the power supply bar, to allow removal of the respective circuit breaker from the device while each of the remaining of the plurality of take-off points maintains the operative position in connection with the power supply bar.

2. The power distribution device of claim 1, wherein each take-off point is enveloped by a shroud.

3. The power distribution device of claim 2, wherein the

35 shroud is retractable along the take-off point to thereby expose the take-off point for connection with the circuit

10625246_1 (GHMatters) P97540.AU.1

- 15 2015213352 04 Sep 2018 breaker .

4. The power distribution device according to claim 3, further comprising a circuit breaker cover coupled to the

5 carriage, wherein the circuit breaker cover prevents access to the take-off point when the circuit breaker is electrically connected to the take-off point.

5. The power distribution device of claim 4, wherein the 10 circuit breaker cover is expelled from the housing as the carriage is moved into the operative position.

6. The power distribution device of claim 5, further comprising an interlock for locking movement of the

15 carriage.

7. The power distribution device of claim 6, wherein the interlock is coupleable with the shroud, such that retraction of the shroud releases the interlock and

20 thereby allows the carriage to be moved into the operative position .

8. A device for distributing electric power from a mains power supply via an isolation contact to a range of

25 electric circuit breakers said device including an electric circuit breaker chassis comprising a housing adapted to receive one of more electricity supply bars and one or more circuit breakers, said housing including a circuit breaker docking station to physically and

30 electrically co-operate with a range of circuit breakers said docking station including an electric take-off output having a take-off shroud adapted to move between a first extended position covering said take-off and a second retracted position exposing said take-off, an electric

35 contact adapted to move between a first isolating position isolating said take-off and said supply bar and a second

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 position bridging said take-off and said supply bar, a circuit breaker cover plate adapted to move between a first retracted position within said housing and a second extended position covering the screw hole of said circuit

5 breaker wherein said contact and said cover are mounted on a slider carriage fitted within said housing said slider being adapted to move between a first position isolating said fitted contact from said take-off and electricity supply bar and simultaneously retracting said cover within

10 the confines of said housing and a second position bridging said take-off and electricity supply bar and releasing said cover wherein said chassis further includes an interlock latch adapted to move between a first position locking the movement of said slider from said

15 first isolating position and a second position allowing said slider to move to said second contact position wherein said interlock latch moves to said second position by co-operation with said take-off shroud such that said interlock latch only releases said slider when said take20 off shroud is retracted into said housing.

9. A device according to claim 8, wherein said circuit breaker cover includes variable height adjustment to accommodate said range of circuit breakers.

10. A device according to claim 8 or claim 9, wherein said housing includes an access port for said slider.

11. A device according to claim 10, wherein said slider

30 includes a tool engaging means to receive a tool to activate said slider between said first and second positions .

12. A device according to any one of claims 8 to 11,

35 wherein said circuit breaker cover is slidably fitted to said slider carriage and adapted for transverse movement

10625246_1 (GHMatters) P97540.AU.1

2015213352 04 Sep 2018 relative to said slider carriage such that the lateral movement of said slider in combination with the transverse movement of said cover fitted to said slider provides a combined movement of said cover between said first

5 retracted position to said second extended position to include said variable height adjustment of said cover in said second extended position.

13. A device according to any one of claims 8 to 12,

10 wherein said interlock latch is pivoted for movement between said first locking position and said second release position, said latch including a release slot adapted to co-operate with a release pin fitted to said take-off shroud and a keeper portion adapted to co-operate

15 with said slider carriage and prevent movement thereof when in the locked position.

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2015213352 13 Aug 2015

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