AU616694B2 - A releasable hold down tie - Google Patents

Description

COMMONWEALTH OF AUSTRALIA Form K) Patents Act 1952-1969 COMPLETE SPECIFICATION Ii (ORIGINAL) FOR OFFICE USE:Cas Application Number Lodged Complete Application No.

Specification Lodged Published Priority, Related art: TO BE COMPLETED BY APPLICANT iName of Applicant: I to& OT-STOPPER PTY. LTD.

.Address of Applicant: 25 Peel Street, Adelaide, State of South :Australia, Commonwealth of Australia Actual Inventor, KENNETU DAVID BROWN a Address for Service, COLLISON CO0_ Patent Attorneys, 117 King William Street, Adelaide, South Australia, :.Complete Specification for the Invention entitled, "A RELEASABLE; HOLD DOWN TIE" goo* The following statement Is a full description of this Invention, including the best method of performing it known to cm us: TR.ADE M.ARKS a DtCSIGNS SUB-OFFICE 0/ 10 NOV 1988 SOUTH AUSTRALIA This invention relates to a releasable hold down tie and to an assembly incorporating such a tie where a tie is used to hold a sump grate in position above a sump outlet.

It is conventional to use a sump grate which rests above a sump outlet where the grate is freely resting and easily removable.

The reason for such easy removal is that this can then allow easy access of liquid sewerage if a blow back occurs which may therefore push the grate 1 0 away from the opening.

A problem that has been discovered is that small children play with the sump grate and can very often remove this and worse still, place foreign articles such as balls into the sump so as to block this.

The difficulty that this invention addresses is to provide means by which such a previously loose device such as a sump grate can be indeed held against removal by children in these circumstances but at the same time can be manufactured very economically and at the same time be easily installed and 20 long lasting in installation.

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A further difficulty is that in the event of a back surge in the sew'rage, it is a further object that the tie will release the sump grate in these circumstances.

25 The Invention is directed to at least one of these problems and accordingly provides means to ensnare a sump grate by engaging around a grate part and including means which are adapted when within the pipe below the sump S: grate, to interlock with the pipe Inner side whereby to resist removal.

In a further form then the invention can be said to reside In a releasable hold down tie for a sump grate which includes means to interengage a sump grate, and joined thereto, means to interlock with the wall of a sump pipe above which Is the sump grate covering an outlet from the sump pipe, said means to interlock Including means to effect a resilient pressure to ensnare the side wall of the sump pipe.

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0: r 0 0*0*i 00 l 0 0: *00 0@ S *g .0 0 Os 3 In preference, the means to interengage the sump grate include a part having a hook shape adapted to engage around a cross piece of a sump grate.

In a further form the invention can be said to reside in a releasable hold down tie for a sump grate comprising an integral member including an uppermost hook part adapted to engage around the cross piece of a sump grate, a neck part extending from the hook part to a side wall engagement part which is adapted to locate against the wall of the pipe below the sump grate at at least two substantially vertically spaced apart locations, and an ensnaring finger part extending to ensnare an opposite side of the pipe from the side wall engagement part and having an upwardly and outwardly inclined end thereto which is within a range of vertical spacing of the side wall engagement part.

Such interlocking can be effected by resilient pressure for relatively extendible parts, which can then ensnare the side walls of the sump pipe.

20 In preference, such interlocking means include a vane adapted upon water surging therepast to be caused to retract such an engaging position whereby to allow for release of this sump grate.

It is known that many differing techniques can be used to indeed spring 25 open and engage with gripping fit a pipe but to assist in a better understanding of this Invention reference shall now be made to a preferred embodiment.

This shall be described with the assistance of drawings in which: Fig. 1 is a cross-sectional view through a typical sump grate and pipe below the sump grate, with a releasable hold down tie according to the embodiment located therein, Fig. 2 is a perspective view of the releasable hold down tie,

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0 0 S 0 4 Fig. 3 is a view just of the top of the sump grate in perspective with the top of the releasable hold down tie engaging over one of the grate parts, Fig. 4 is a side view of a release hook, and Fig. 5 is a second embodiment.

Referring in detail to the drawings, there is a sump grate 1 which freely rests upon the top of a sewerage pipe 2.

The releasable hold down tie 3 comprises a single piece of wire which is bent so as to have an uppermost hook part 4, a neck part 5, a side wall engagement part 6 and an ensnaring finger part 7. A diversion vane 8 Is secured to the underneath side of the finger part 7.

The wire from which the tie 3 is formed is chosen so that it will have adequate spring capabilities and such that it will be able to snare with spring engagement and indeed hold against the inner side of the wall S 20 of the pipe 2.

j To this extent, the proportions and angle of the finger part 7 and the side wall engaging part 6 have to be such that when the finger 7 engages against the wall, there are parts of the engaging part 6 which are then above and parts below so that the tie will not be unduly displaced by such pressure.

Further however, thes angle of the finger 7 with relation to the vertical alignment of the pipe or perhaps more correctly the alignment of the 30 side wall engaging part 6 is selected to ensure that the end 9 will effectively ensnare and lock onto the side of th' wall.

0 4 I It has been found necessary that this shall be a hard part to ensure that It ensnares rather than presses and, slides over but with this feature, it has been found to be a successful arrangement.

In order to release the tie 3, a hook such as that shown at 10 can be located down betwee;i the grate and simply hook under the finger 7 r I ii ~I i i lifting this from active engagement and the tie will then easily release and the sump can be lifted away.

In the same way of course if there is a surge from below, the pressure of water against the vane 8 will effect the same result freeing the engaging pressure and the whole of the sump guard together with the tie wili be pushed away.

In installation, it will now be very evident that all that is necessary is for this device to be pushed into the pipe and then a sump grate 1 can be located with the hook 4 located over and around a grate part as shown at 11 and thereafter small children at least will not be able to easily lift the sump grate 1 and of course put foreign articles down the sump.

In Fig. 5 the pipe 12 is ensnared by tie 13, which has an uppermost hook part 14, a neck part 15, a side wall engagement part 16, an ensnaring finger part 17, a release vane 18 and end 19.

While one particular embodiment has been described it is well 20 understood that this could be developed from other materials such as moulded plastic or cast from cast steel of even aluminium and it is understood that such changes including different means to hold the releasable top member are all Incorporated within the broader concept of this invention.

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Claims (9)

1. A releasable hold down tie for a sump grate which includes means to interengage a sump grate, and joined thereto, means to interlock with the wall of a sump pipe above which is the sump grate covering an outlet from the sump pipe, said means to interlock including means to effect a resilient pressure to ensnare the side wall of the sump pipe.

2. A raleasable hold down tie for a sump grate as in the last preceding claim further characterized in that the means to interengage the sump grate include a part having a hook shape adapted to engage around a cross piece of the sump grate.

3. A releasable hold down tie for a sump grate as in either preceding claim further characterized in that the means to effect a resilient pressure are relatively extendible parts by which the interlocking is achieved by an ensnaring between the opposite wall parts of the pipe.

4. A releasable hold down tie for a sump grate comprising an integral 20 member including an uppermost hook part adapted to engage around the cross piece of a sump grate, a neck part extending from the hook part to a side wall engagement part which is adapted to locate against the wall of the pipe S"below the sump grate at two or more substantially vertically spaced apart locations, and an ensnaring finger part extending to ensnare an opposite side of the pipe from the side wall engagement part and having an upwardly and outwardly inclined end thereto which Is within the range of vertical spacing of the side wall engagement part.

A releasable hold down tie for a sump grate as in any one of the preceding claims wherein there is included a vane adapted and positioned whereby to effect a release of an interlocking ensnarement upon water surging therepast from a sump pipe.

6. A releasable hold down tie for a sump grate comprising a member comprised of a wire having at an uppermost end an inverted shape, extending from the shape a neck part across to one side forming therebelow a side wall engagement part and extending from a bottom of the side wall engagement part in an upwardly and outwardly inclined eirection an ensnaring finger part. 1 i i 7

7. A releasable hold down tie as in the last preceding claim wherein a vane is attached to the ensnaring finger part.

8. A releasable hold down tie for a sump grate as in any one of the preceding claims in which the tie is comprised of a plastics material.

9. A releasable hold down tie substantially as described in the specification with reference to and as illustrated by the accompanying drawings. An arrangement incorporating a releasable hold down tie when locating within a sump pipe and including an uppermost part engaging around a cross piece of a sump grate, and extending therebelow and to one side, a 1 5 neck part, and there below a side wall engagement part which engages along the side of the wall of the sump pipe, and an ensnaring finger part extending from a bottom of the side wall engagement part such that the end of the K, ensnaring finger part engages with gripping force an opposite side of the wall j. of the sump pipe. I I11. An arrangement incorporating a releasable hold down tie as i, 'described in the specification with reference to and as illustrated by the accompanying drawings. 25 12. A method of holding down in releasable manner a tie for a sump grate which includes pushing a tie, as characterized in any one of the preceding claims, between cross pieces of a sump grate, effecting relative :rotation of the tie with respect to the sump grate so that the hook part will "engage over a cross piece of the sump grate and then pushing the tie down to 3 0 the extent that it ensnares within the sump pipe. Dated this 12th day of August 1991. TOT-STOPPER PTY. LTD. By their Patent Attorneys, Ci.tSO Co. L> y apjwb. \a