Lever handles and door knobs for framed doors As an alternative to the cran- ked lever handles for narrow- frame doors FSB has always supplied, we are using the 02|03 edition of our Manual to switch the focus to cran- ked lever handles fitted away from the centre of pivot, thus keeping the hand well away from the edge of the door, out of harm’s way. With this approach, the de- sired lever handle design is fitted on a pivoting arm to the side of the rose. The centre of pivot in the rose is doubly supported between a base- plate and a housing. This rugged double bearing for the pivoting arm reduces tolerances. The entire works is concealed behind a cap made of the same material as the lever handle, cf. pp. 424 and 425. Set out in the following sec- tion is the complete FSB range of cranked lever hand- les for narrow-frame doors for both standard and fire-safety applications. The range is rounded off by a series of standard lever handles on oval roses. These handles can be used as standard fe- male handles on the opposite side of the door as in the 'Wittgenstein' scheme descri- bed overleaf. 419 8
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Lever handles and door knobs for framed doors 8 · 2007-03-21 · and door knobs for framed doors As an alternative to the cran-ked lever handles for narrow-frame doors FSB has always
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Lever handles and door knobs for framed doorsAs an alternative to the cran-ked lever handles for narrow-frame doors FSB has alwayssupplied, we are using the02|03 edition of our Manualto switch the focus to cran-ked lever handles fitted awayfrom the centre of pivot, thuskeeping the hand well awayfrom the edge of the door,out of harm’s way. With this approach, the de-sired lever handle design isfitted on a pivoting arm tothe side of the rose. The centreof pivot in the rose is doublysupported between a base-plate and a housing. This rugged double bearingfor the pivoting arm reducestolerances. The entire worksis concealed behind a capmade of the same material asthe lever handle, cf. pp. 424and 425.Set out in the following sec-tion is the complete FSBrange of cranked lever hand-les for narrow-frame doors forboth standard and fire-safetyapplications.The range is rounded off by aseries of standard lever handleson oval roses. These handlescan be used as standard fe-male handles on the oppositeside of the door as in the'Wittgenstein' scheme descri-bed overleaf.
FSB supplies a completerange of different types ofhandle (levers, knobs andpulls) for narrow-frame doorsin metal, plastic or wood.
Hand injury hazard
The dimensional limits of nar-row-frame doors can lead to fingers getting caught whenthe door is operated. This isparticularly true of the closingface (Fig. 1).
A further consequence ofthe spatial constraints referredto is a certain difficulty infixing the furniture. The locksused feature a very shortbackset (25, 30, or 35 mm)and do not allow through fixingas an op-tion. Thus leverhandles, knobs, and pullsmust generally be face fixedonto the stile.
An inspired idea by the philo-sopher Ludwig Wittgenstein
The Austrian philosopher andqualified engineer LudwigWittgenstein took time off fromphilosophising in the 1920s todesign the interior of his sister'shouse, Palais Wittgenstein, inVienna. In the process he hadto come to grips with very nar-row steel door stiles. To enablefurniture to be firmly fixed ontothe stiles yet prevent hands getting caught between theclosing face and the doorjamb, Ludwig Wittgenstein hada cranked handle made for theclosing face to his own draw-ings, and to this he connecteda normal male lever handle onthe opening face. By combi-ning a cranked female handlewith a standard male leverhandle in this inspired fashion,a man who otherwise appliedhimself to the imponderablesof language produced a veryclear-cut answer to the pro-blems of injuries to the handand firmness of fixing (Fig. 2).
FSB recommends giving theWittgensteinian solution a newlease of life by pairing crankedand uncranked lever handles,the cranked handle being used as the male section andits uncranked counterpart pro-viding a rugged connection(Figs. 3 and 5).
Anyone studying the remedyadvocated for such problems in the past will be shakingtheir heads in disbelief giventhese insights. Two crankedfemale handle sections, rigidlymounted but freely rotating,were screwed onto the stileand joined together by meansof a floating spindle (Fig. 4).
422
1 2 3
4
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The alternative
As an alternative to the cran-ked lever handles suppliedhitherto, FSB is introducing anew type of hardware in whichthe lever handle is locatedaway from the point of pivot.
The pivot shaft in the rose isdoubly supported between thebaseplate and the housing. This rugged double bearingimproves tolerances. The de-sired lever handle design ispositioned on a swivel lever tothe side of the rose (Fig. 5).
This adaptive alternativeenables FSB to offer a solutionfor the wishes of architects toequip their building projectswith the same design of leverhandle in all its technical di-versities.
Rivet nuts
To ensure hardware for narrow-frame doors is securely affixed,FSB recommends the use ofrivet nuts in which fittings aresubsequently anchored bymeans of non-looseningscrews.
The heads of these rivetnuts (Ø 11 mm) fit snugly intothe underside of FSB fittingsfor narrow-frame doors. Thecombination of rivet nuts, ba-seplate and non-looseningscrews enables fittings to bevery securely fastened. (Fig. 6)
Front-end borehole
To further reduce any remai-ning play between spindle,follower and other parts, FSBrecommends firmly tighteningfittings for narrow-frame doorsagainst the spindle via thegrub screw in the front-endborehole.
Antislip and screw-retentiondevice
Notwithstanding the use ofrivet nuts and non-looseningscrews, at their fixing centresall FSB roses forming part ofhardware for narrow-framedoors feature retarder plugsmade of a rubbery plastic.These retarder plugs projectslightly beyond the reverse ofthe rose and are compressedwhen the screws are tighte-ned. Hence, they act as anantislip device against theirhost surface whilst also pro-viding the necessary axial andradial tension to keep thescrews in a vice-like grip (Fig. 7).
Spring loading
Virtually the entire FSB rangefor narrow-frame doors is fittedwith a positive mechanism tosupport the lock springs. Thisrestricts the angle of operationto 45°. If required (i.e. for in-active doors), the positive me-chanism can be straightfor-wardly removed from the base-rose. (Fig. 8)
Lever handle on oval rose
Uncranked FSB lever handlesare supplied for invisible fixingto narrow-frame doors on ovalroses. They are fitted with po-sitive mechanisms (maximumangle of operation 45°) andoptionally front-end boreholes.
Supplied as standard with 8 mm square hole. Leverhandle variants for fire andsmoke stop doors with 9 mmsquare hole.
423
5 6 7 8
8
FSB Adaptor-solution
8
14
22
32,5
50
57
70
424
Since it is not possible todesign separate narrow-framehandles to go with all ourinternal-door models, however,FSB recommends using its pa-tented and design-protectedadaptor combination.The Picture opposite visualisesa few of the possible options.Whilst variants in stainlesssteel are generally suitable foruse on smoke and fire controldoors, there are restrictions inthis respect as regards alu-minium.
Many architects and plannersset store by matching leverhandle designs for internaland narrow-frame doors. Onthe pages that follow, FSBoffers a wide range of solu-tions for some of its typicallever handle types.
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Lever handles for framed doors fixed on oval rose, with concealed fixing and support mechanism 8 mm -hole 9 mm -hole for fire and smoke stop doors* ƒ
Lever handles for framed doors fixed on oval rose, with concealed fixing and support mechanism 8 mm -hole 9 mm -hole for fire and smoke stop doors* ƒ
32,5
70
88
164
14
32,5
70
88
155
14
426
0653 21 Aluminium Stainless steel
0653 22 ƒAluminium Stainless steel
0607 21 Aluminium Stainless steel
0607 22 ƒAluminium Stainless steel
0673 21 Aluminium Stainless steel
0673 22 ƒAluminium Stainless steel
The cranked lever handles,illustrated on these pages, arethe well-tried forerunners ofthe solution illustrated on page424. Their operating principlesare set out on pages 422 and423.
Lever handles for framed doors fixed on oval rose, with concealed fixing and support mechanism 8 mm -hole 9 mm -hole for fire and smoke stop doors* ƒ
32,5
70
82,5
171
14
50
21
20
32,5
70
86
160
14
428
0656 21 Aluminium Stainless steel
0656 22 ƒ Aluminium Stainless steel
0616 21 Aluminium Stainless steel
0616 22 ƒ Aluminium Stainless steel
0647 21 Aluminium Stainless steel
0647 22 ƒ Aluminium Stainless steel
0665 21 Aluminium Stainless steel
0665 22 ƒ Aluminium Stainless steel
The cranked lever handles,illustrated on these pages, arethe well-tried forerunners ofthe solution illustrated on page424. Their operating principlesare set out on page 422 and423.
The cranked lever handles,illustrated on these pages, arethe well-tried forerunners ofthe solution illustrated on page424. Their operating principlesare set out on page 422 and423.
The cranked lever handles,illustrated on these pages, arethe well-tried forerunners ofthe solution illustrated on page424. Their operating principlesare set out on page 422 and423.
c:c screwholes 50 mm,for countersunk screws M5.Door knobs 0686 06 and 2386 06 c:c screwholes 67,5 mm for countersunkscrews M5.
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Roses for framed doors
32,57
70
440
1758 Aluminium Stainless steel
1757 Aluminium Stainless steel
1718 Aluminium
1719 Aluminium
c:c screwholes 50 mm,for countersunk screws M5
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Roses for framed doors
441
65
30 6 9 14
70
30 6 9 14
65
28 3 8
70
28 3 8
Sliding escutcheons
1776 6 mm
1777 9 mm
1779 14 mm
Aluminium Stainless steel Aluminium + colour
Sliding escutcheons
1726 6 mm
1727 9 mm
1728 14 mm
Aluminium Stainless steel Aluminium + colour
Self adhesive escutcheons
1768 3 mm
1769 8 mm
Aluminium Stainless steel Aluminium + colour
Self adhesive escutcheons
1729 3 mm
1730 8 mm
Aluminium Stainless steel Aluminium + colour
c:c screwholes 50 mm,for countersunk screws M5
c:c screwholes 50 mm,for countersunk screws M5
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Roses Backplate for framed doors
32,5
70
7
442
1752 1755 Aluminium Aluminium + colour
c:c screwholes 50 mm,for countersunk screws M5
1717 Aluminium Aluminium + colour
c:c screwholes 50 mm,for countersunk screws M5
1550 Aluminium
c:c screwholes 210 mm,for countersunk screws M4
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Backplate version Roses version
Gymnasium fittings
443
7949 Stainless steel
Applications exist in which it isnot permissible for the handleto protrude above the surfaceof the door, in the case ofsliding-door designs, for in-stance, or gymnasium doors.
FSB has devised two mo-dels of gymnasium fittings forsuch applications. The FSB7949 model is angular withmitred corners. FSB 7950, bycontrast, features roundededges.
Flush handles FSB 7949and 7950 are combined onthe reverse side with hardware from the FSB heavy-duty programme, with the option of either a backplate or rose. Cf. page 91ff.
Doors to which flush handlesare to be fitted must be at least55 mm thick. To rule out anychance of injury, it should beensured when be fitting thehandle that there is sufficientbackset and the rim rests fullyflush against the door.