AU692184B2 - A hinge - Google Patents

Description

to is 1$11 This invention relate to hinges, particularly to hingjes for doors, such an security screen door,,- which are vulnerabl~e to je11mmy attack, Traitionally, effort has been made to malto hinqes more robus.t to reoist forced onty but because. oecuriy duovwi ae inherently floxibl it in very difficult to rtorain a idoor from 25 felxinq undve jemny attack, the mnost common and oeecectivo way of 4 *4 gainin(J forced ontry and strengthening the hiungcoi ioeo not properly addrecso the. problem. To reduce the probability of gaitiinj forc(E entry it isi roally better to incteace the prob ability of a hinge remaxixinw properly secured to the door and adjacent door jamb when flexinQj ocC(ur'cl 4: 2 According to one aspect of the invention there is provided a hinge for a door supported within an opening including a first portion securabl~e to the door, a second portion by which the hinge is securable to the opening and a third portion connecting the first and second portions, the first portion being movable with the door when the door, when in a closed position, is displaced relative to the second portion by an attempt at forced entry whereby the door remains secured to the first portion and the second portion remains secured to the opening with relative translational movement occurring between the first and second portions as a result of the attempt at forced entry, the third portion deforming to facilitate such relative trainslational movement between the first and second portions while maintaining the connection therebetween.

Embodiments of the present invention will now be deocribed, by way of example only, with reference to the accompanying too drawings, in whichtto Figure I is a partial sectional plan view of a hinge with 606 20elongated parallel apertures attached to a closed door within an tooi 0 Figure 2 is a partial side view of the hinge of L,-gtre It in an opened unattached configuration; Figure 3 is a ochematic side view of the hinge of Figure I of,: 25 being deformed by a jemmy.

-3- Figure 4 is a schematic side view of the hinge of Figure 3, when the door is in an opened unattached configuration.

Figure 5 is a partial side view of a hinge with an alternative third portion.

The accompanying drawings illustrate two embodiments of a hinge. The main difference between the embodiments is in the position of the deformable portion of the hinge. The same reference numerals are used for like components in all embodiments as shown in Figures 1 to The hinge is like a common butt hinge manufactured from mild steel sheet having two substantially flat leafs 10 and 20 joined at a pivot joint 30 which as is common comprises a pin and fingers alternatively emanating from the loafo and 20 formed around the pin.

A door 11, Figure 1, which may have a vertical edge recess 12 is attached to a first portion 14 of the hinge being a portion of first leaf 10 by countersunk screws or rivets 13. This portion 14 of the first leaf may if necessary be stepped towards the door to accommodate the vertical edge recoss 12 as shown in Figure 1.

X. A door opening 40, Figure 1, including a raised door 25 top 41, is attached to d second portion SO of the hinge being a portion of oocond leaf 20, by countersunk screwo or rivets 53. This portion of the second leaf may comprise a planar extension to the second leaf or it may comprise a stepped extension of the socond loaf towards the door to 30 accommodate the height of the door stop 41 ao chown in PFigures 1 and 3.

It is preflrable that the portiona of the hinge which are secured to the door and door opening are well secured by fastenorso of ouitablo diameter and length so that the fixings can withsaand loado which urge separation. One of the important objectivoe of thli embodiment is to provide a hinge which retains a door closed and impassable after Sattempted fored entry. It is importart therefore that the f ;-Ft I&p -4first portion remains attached to the door and the second portion remains attached to the door jamb at all times even if the hinge and door are damaged by attempted forced entry.

Because security doors are inherently flexible it is very difficult to restrain a door from deforming under jemmy attack, the most common and effective way of gaining forced entry as shown in Figure 3, and strengthening the hinges does not properly address the problem. To reduce the probability of gaining forced entry it is better to accommodate the flexing and preferably at reduced loads, while ensuring that the hinge remains properly secured to the door and adjacent opening during and after deformation.

Positioned between the first portion 14 and second portion 0o there is a third portion 60 which has been selectively weakened to accommodate a deformation at relatively low loads so e" that when a jemmy is applied between the door edge and jamb and the door edge is driven away from the jamb the hinge deforms at loads less than the loads which would cause failure of the fastenings. This portion may be positioned within the planar 20 portion of the second leaf as shown in Figure 2 and 4, between the planar portion of the second leaf and the planar extension as ohown in Figure 5 or within the step up portion of the stepped extension to the second leaf or a combination of the above.

25 in each case there are provided parallel rows of elongated apertureo 61 wherein the aperturea in each alternative row are aligned and offset from the apertures in adjacent rows to provide relatively easily deformable load bearing leog 62 between the fixing portions 50 and 14, The portion G6 of Figure 1 deforma to a configuration as shown in Figure 4 where typically the distance between the ends of the legs 64 to S6 has increased to 66 and 67 ov have other logs within the portion It ahould be noted that deformation is not reotricted to planar deformation nor decormation within the third portion, It will be *een from Figure 4 that the relative movemnt which has occurred between the portions 50 and 14 as a result of the Cr- vl C, j 1 tlr 1^1 forced deformation of portion 60 is a translational movement whereby portion 14 can displace away from the portion 50 in a idewayu- type movement different from the regular hinging movement allowed between thes portiono by the hinge pin.

in some cases it is deirable to provide additional fixing in the third portion and fixing aperture 22 can be provided.

Where this aperture is within the third portion it is understood that this fixing be of limited strength so that on the application of loado derived from attempted forced entry this fixing would fail 0o aa' not to critically (a ff ect deformationl of the third portion, Throughout this specificatioa and claimo which follow, unleoo the context requireo otherwiee, the word "c'omprioe' and variationc such ao II con pricier l or "c omprioinj", will be undoretood to impn.y the inctuoion of a ctated integer or group of integere or atepo but not the excluoion of any other integer 0 group of integerct 4 .4: 4 4*4: 4~c 4*r

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4* 4j 44 44. 4

Claims (4)

1. A hinge for a door supported within an opening including a first portion securable to the door, a second portion by which the hingje i.0 oecurable to the opening and a third portion connecting the first and second portions, the first portion being movable with the door when the door, when in a closed positionl, is displaced relative to the second portion by an attempt at forced entry whereby the door remains secured to the first portion and the second portion remains secured to the opening with relative translational movement occurring4 between the first and seoond portions as a result of the attempt at forced entry, the third portion deforming to facilitate. ouch relative tranolational movement between the first and s,-econd portions while maintaining the oonnection therebotween. Goo$4 2~Ahinge acco'rdling to claim 1, wherein the de(fot.ntion of the thlird portion isi precdicto-AJlo in form and occuirring at 04* r-elatively low loads,

3. A hingoe accordinj to c"laim I. or Claim wherein the third 4 44 portion to tho second portion whereby the firsit portion may be dipae ou)ttwar Ily from thle s0c.ond portion, too:* 4.,A hingec according to anty one ofE the claimsn I to 3, wherein e j.cond portiJon compris.es' a plate with ait least onle screw aperftur( by which it ic scuctred inl pos'ition. S. Anl aemtbly 'opriing ,(dno, an opening_', a hinge secured to the door 01d opeingr adlne opiiga ie oto secuired to thhe (11)01 a s0e0on0 por1tion l 'ul to the openling, arid a third plortionl (inlc t ill, the first portionl to the s"econdl Portionx sai fizrs t portion being movabl by mVOvement of the-- doo wenin a lse oito uvinj ate~pEorced'( entty, 0'~Aid do--,A uroingj the first portionl to diaeWith the do'or 6K

7- relative to the second portion with relative translational movement occurring between the Eirst and second portions as a result of the attempt at forced entry, the third portion deforing to facilitate the relative tranolational movement between the first and second portions while maintaining the connection therebetween and to allow the integsrity of tho oecuremernt of the hinge to the door and ovpeinq to be 6. An atommbly substantialy as hez'inboforo dencribod with refsrence to the accomtpanying drawino. 7, A hinge substantially as hereinbefore dooribed with reernce t the accOtnpanying drawings, DATBO thisn qth day of April, 199S v7OIN RPaent' AttowAyc By his Vitoxflrr, Attoafnoytit DAVIEU COLTITSON CAV 9*( .9p 4. .41C 4 *01 *9 4 94 .9o 44*9P 9C *9.

44.4 9 4,r cr~ L AG ABSTRACT A hincje for -a dor~ oupported within an. opening includinq a firot por'tion aecured to the door, a oecond portion by which the hinge in oecured to the opening and a third portion conntinq the firot and fecconid portions 1 the firsit pcrtion being mova'blo whon the door is dioplacod relative to the second portion by an, atenlpt at forced entry whereby the door romlaiLO secured to the firflt port ion, the thirdI portion dinplacinq t'o facilitate the volative movoment botwoori the first and, so nd portionel while mainltainlinq thw cunneilcti ml thorebetween and toll the integrity of oocuromfent, t o bo 4 4 4.4 of, 4. 4