SE505288C2

SE505288C2 - Centring device for fixing CRT in front of housing

Info

Publication number: SE505288C2
Application number: SE9202593A
Authority: SE
Inventors: Thomas Knafve
Original assignee: Icl Data Ab
Priority date: 1992-09-09
Filing date: 1992-09-09
Publication date: 1997-07-28
Also published as: SE9202593L; SE9202593D0

Abstract

The casing has a rectangular opening, the size and configuration of which corresp. to that of the CRT screen. Each corner of the opening in the casing is assigned a pliable centering component which works in conjunction with the other centering components (16) to centre the CRT accurately in the opening. Each centering component has two separate, tongue-shaped ribs, formed in one piece with the front casing (10), which extend upwards from the casing interior, away from the opening in the casing towards the insertion direction of the CRT (12). The free ends of the ribs have opposing bevelled formations which slope towards each other in the direction of insertion of the CRT.

Description

15 20 25 30 35 505 288 2 fig 2 visar ett styrelementpar enligt uppfinningen, sett i riktningen för pilen A i fig 1. Fig. 2 shows a pair of control elements according to the invention, seen in the direction of the arrow A in Fig. 1.

I fig 1 visas insidan av en frontkåpa 10 till en monitor, varvid ett bildrör 12 monterats i kåpan med hjälp av fästdon 14 vid varje hörn av bildrörets 12 bildskärm. Frontkåpan 10 har en icke visad central öppning, vars storlek och konfigu- ration i huvudsak överensstämmer med storleken och formen av bildskärmen hos det bildrör, som skall monteras i frontkåpan.Fig. 1 shows the inside of a front cover 10 of a monitor, a picture tube 12 being mounted in the cover by means of fasteners 14 at each corner of the screen of the picture tube 12. The front cover 10 has a central opening (not shown), the size and configuration of which substantially correspond to the size and shape of the display of the display tube to be mounted in the front cover.

För att vid monteringen av bildröret 12 underlätta och till- försäkra en noggrann centrering av detsamma i frontkåpan, så att bildskärmen kongruent övertäcker öppningen i denna, har frontkåpan 10 vid varje hörn av öppningen två åtskilda, fjädrande styrribbor 16 som sträcker sig upp från frontkåpans 10 insida och uppvisar avfasningar 18 (fig 2) vid deras yttre ändar. Dessa avfasningar 18 medger bildrörets 12 hörn att införas mellan två närliggande styrribbor 16, om bildröret 12 och frontkåpan 10 vid deras sammanföring ej är helt centrera- de inbördes. I sådant fall bringas styrribborna 16 att fjädra utåt, varvid de är så utformade och placerade att de utövar en kraft inåt på bildröret 12 respektive en kraft utåt på fronkåpan 10, beroende på vilket av föremålen som hålles fast under monteringen.In order to facilitate and ensure an accurate centering thereof in the front cover, so that the monitor congruently covers the opening therein, the front cover 10 has at each corner of the opening two separate, resilient guide ribs 16 extending up from the front cover 10. inside and have chamfers 18 (Fig. 2) at their outer ends. These chamfers 18 allow the corners of the picture tube 12 to be inserted between two adjacent guide ribs 16, if the picture tube 12 and the front cover 10 when they are joined are not completely centered relative to each other. In such a case, the guide ribs 16 are caused to spring outwards, whereby they are designed and positioned so that they exert a force inwards on the picture tube 12 and a force outwards on the front cover 10, respectively, depending on which of the objects is held during assembly.

De fyra paren av styrribbor 16 vid hörnen av bildskärmen respektive öppningen i kåpan 10 är härvid så symmetrisk placerade, att de vid ingreppet med bildrörets hörn strävar att utbalancera varandra och därvid åstadkomma en noggrann inbördes centrering av bildröret 12 och frontkåpan 10. I den visade utföringsformen i fig 1 och 2 har styrribborna 16 formen av platta uppåtstående tungor, vilka företrädesvis är formade i ett stycke med frontkåpan 10, som lämpligen består av plastmaterial. Inom ramen för uppfinningen kan emellertid styrribborna 16 ha annan lämplig form, så länge som de utövar symmetriskt riktade krafter på bildröret respektive front- kåpan, så att dessa centreras korrekt inbördes.The four pairs of guide ribs 16 at the corners of the display and the opening in the cover 10 are then placed so symmetrically that in the engagement with the corners of the display tube they strive to balance each other and thereby achieve an accurate mutual centering of the display tube 12 and the front cover 10. in Figs. 1 and 2, the guide ribs 16 are in the form of flat upstanding tongues, which are preferably formed in one piece with the front cover 10, which suitably consists of plastic material. Within the scope of the invention, however, the guide ribs 16 may have another suitable shape, as long as they exert symmetrically directed forces on the picture tube and the front cover, respectively, so that these are correctly centered relative to one another.

Claims

Device for centering a display tube (12) when mounting the same in a front cover (10), which cover has a substantially rectangular opening, the size and configuration of which substantially correspond to those of the display tube display, wherein in each corner of the opening in the housing is arranged a resilient centering means, arranged to carefully center the picture tube in the opening in cooperation with the other resilient centering means (16), characterized in that each centering means (16) has two separate, in one piece with tongue-shaped ribs (16) formed on the front cover (10), which extend up from the inside of the cover, away from the opening in the cover in a direction towards the insertion direction of the picture tube (12), the free ends of the ribs (16) having opposite chamfers (18) inclined towards each other in the fine-tuning direction of the picture tube.