SE462032B

SE462032B - Anti-theft device

Info

Publication number: SE462032B
Application number: SE8902114A
Authority: SE
Inventors: U L Zell
Original assignee: Bess Sweden Ab
Priority date: 1988-08-24
Filing date: 1989-06-12
Publication date: 1990-04-30
Also published as: SE8802965D0; SE8902114D0; SE8902114L

Abstract

An anti-theft device having a hood 1, a suction head 8 and a control member for manoeuvring the suction head. The anti-theft device is distinguished by a plate 11 which is anchored in the suction head, a pin 12 anchored in the plate and provided with a thread 13 and a spindle 14 which at its one end is fixedly coupled to the inside of the hood and which has an internal thread in engagement with the thread 13 of the pin. Rotation of the hood means that the spindle draws up the suction head and creates a large force, proportional to the angle of rotation of the hood, by which the anti-theft device is secured against the object, for example a car windscreen, which is to be protected. <IMAGE>

Description

462 032 2 in under sugkoppen, varvid stöldskyddets vidhäftning mot det skyddade föremålet upphör. För förhindrande av att detta inträffar utförs stöldskyddets kåpa och det membran av vilket sugkoppen är bildad på det sätt som anges i de bifogade patentkraven 3-5. Tack vare detta utförande kan endast veka föremål obehörigen stickas in mellan kåpan och det skyddade föremålet. För att komma in till sugkoppens vakuumomràde måste ett sådant vekt föremål skjutas en lång sträcka, närmare bestämt en sträcka motsvarande bredden av cirkelringområdet. 462 032 2 under the suction cup, whereby the adhesion of the anti-theft device to the protected object ceases. To prevent this from happening, the cover of the anti-theft device and the membrane of which the suction cup is formed are made in the manner specified in the appended claims 3-5. Thanks to this design, only soft objects can be unauthorizedly inserted between the cover and the protected object. To enter the vacuum area of the suction cup, such a weighted object must be pushed a long distance, more precisely a distance corresponding to the width of the circular ring area.

Eftersom sugkoppens material är tämligen massivt och tämligen elastiskt och dessutom anligger mot det skyddade föremålet med en stor kraft kommer ett sådant vekt föremål att av friktionskrafter, skjuvningskrafter och annat allmänt motstånd köra fast i cirkelringområdet av membranet och aldrig komma in till sugkoppens vakuumomràde.Since the material of the suction cup is rather solid and rather elastic and also abuts against the protected object with a large force, such a weighted object will by frictional forces, shear forces and other general resistance get stuck in the circular ring area of the diaphragm and never enter the suction cup vacuum area.

Uppfinningen kommer att beskrivas närmare nedan i anslutning till de bifogade ritningarna, i vilka fig. 1 är en tvärsektionsvy av stöldskyddet enligt uppfin- ningen och fig. 2 är en plan vy ovanifrån av stöldskyddet i fig. 1.The invention will be described in more detail below in connection with the accompanying drawings, in which Fig. 1 is a cross-sectional view of the anti-theft device according to the invention and Fig. 2 is a plan view from above of the anti-theft device in Fig. 1.

Stöldskyddet i fig. l innefattar en kåpa 1 av metall för anbringning vid ett ej visat föremål som skall skyddas, t.ex. en glasruta. Kåpan 1 är i sektion tallriksformad och består av en övre vridbar del 2 och en undre fast del 3. Den övre delen 2 har ett plant parti 4. De övre och undre delarna är vridbart förbundna med varandra genom ett glidlager 5 i form av en vid den övre delen 2 fastsvetsad ring med ett utvändigt radiellt spår 6 som glidbart upptar en radiellt inåtlöpande fläns 7 i det övre kantpartiet av den undre delen 3. Kåpan är lämpligen framställd av stålplåt eller härdad stålplåt, som förhindrar obehörig håltagning genom borrning. Den undre delens diameter är ca. 30 cm, den övre delens ca. 17 cm.The anti-theft device in Fig. 1 comprises a metal cover 1 for application to an object (not shown) to be protected, e.g. a glass pane. The cover 1 is plate-shaped in section and consists of an upper rotatable part 2 and a lower fixed part 3. The upper part 2 has a flat portion 4. The upper and lower parts are rotatably connected to each other by a sliding bearing 5 in the form of a wide the upper part 2 welded ring with an outer radial groove 6 which slidably receives a radially inwardly extending flange 7 in the upper edge portion of the lower part 3. The housing is suitably made of sheet steel or hardened steel sheet, which prevents unauthorized drilling by drilling. The diameter of the lower part is approx. 30 cm, the upper part approx. 17 cm.

Ett membran 8 av gummimaterial har en form som överensstämmer 462 052 3 med kåpans cirkulära form och en storlek som är obetydligt mindre än kåpan så att kåpan uppifrån skyddar membranet mot obehörig påverkan. Membranet 8 har en tjocklek som är avsmal- nande i radiell riktning i det radiellt yttersta partiet av kåpan. Kåpans radiellt yttersta parti 9 sträcker sig radiellt utåt och förbi membranets 8 yttersta kant samt löper dessutom ner mot det skyddade föremålets överyta till bildande av en minimal springa 10 som väsentligen förhindrar obehörig instick- ning av föremål under kåpan. I membranets 8 centrala parti är en platta 11 fast förankrad, t.ex. genom invulkning i mate- rialet av membranet 8. En tapp 12 är fast kopplad till plattan 11. Tappen 12 är försedd med en gänga 13, t.ex. en trapetsgänga med stor stigning. En mutter 14, även benämnd spindel, är vid sin ena ände fast anordnad vid insidan av det plana partiet 4 av kåpans övre del och har en invändig gänga som är i ingrepp med tappens gänga 13. Det inses att vid vridning av kåpans övre del genom en förutbestämd vinkel kommer spindeln att dra upp plattan 11 och därmed membranet 8 från det i fig. 1 med heldragna linjer visade läget till ett övre, med streckade linjer visat läge. Membranet 8 bildar därvid en sugkopp och ett undertryck uppstår i det utrymme 15 som bildas mellan sugkoppen och det skyddade föremålet. Spindeln kan vara försedd med ej visade ändstopp 16 som förhindrar att plattan ll dras upp så mycket att glasrutan spricker. Ãndstoppet 16 kan t.ex. vara en massiv cylinder löst inlagd i mutterhålet och som kommer till anliggning mot undersidan av det plana partiet 4 resp. översidan av tappen 12 när maximalt upplyft läge för membranet 8 uppnåtts.A membrane 8 of rubber material has a shape which corresponds to the circular shape of the cover and a size which is slightly smaller than the cover so that the cover from the top protects the membrane against unauthorized influence. The diaphragm 8 has a thickness which tapers in the radial direction in the radially outermost portion of the housing. The radially outermost portion 9 of the cover extends radially outwards and past the outermost edge of the membrane 8 and also runs down towards the upper surface of the protected object to form a minimal gap 10 which substantially prevents unauthorized insertion of objects under the cover. In the central part of the membrane 8 a plate 11 is firmly anchored, e.g. by filling in the material of the membrane 8. A pin 12 is fixedly connected to the plate 11. The pin 12 is provided with a thread 13, e.g. a trapezoidal thread with a large pitch. A nut 14, also called a spindle, is fixed at one end at the inside of the flat portion 4 of the upper part of the housing and has an internal thread which engages with the thread 13 of the pin. It will be appreciated that when turning the upper part of the housing through at a predetermined angle, the spindle will pull up the plate 11 and thus the diaphragm 8 from the position shown in solid lines in Fig. 1 to an upper position, shown in broken lines. The membrane 8 then forms a suction cup and a negative pressure arises in the space 15 formed between the suction cup and the protected object. The spindle may be provided with end stops 16 (not shown) which prevent the plate 11 from being pulled up so much that the glass pane cracks. The end stop 16 can e.g. be a solid cylinder loosely inserted in the nut hole and which comes into abutment against the underside of the flat portion 4 resp. the upper side of the pin 12 when the maximum raised position of the diaphragm 8 has been reached.

Membranet 8 är försedd med ett antal koncentriska, ringformade vulster 17, 18, 19, 20, 21 av sådan höjd att vulsternas toptarti anligger mot undersidan av kåpans under del 3. Den kraft med vilken sugkoppens platta ll dras uppåt vid kring- vridning av kåpans övre del 2 kommer då att överföras genom kåpan och från kåpan till vulsternas toppar' ner Ätill ett brett cirkelringområde beläget utmed kanten av'membranet 8. Vid de angivna dimensionerna har ett tryck på 0.6 bar uppmätts inuti utrymmet 11 när sugkoppen intar det med streckade 462 032 4 linjer i fig. 1 visade läget och stöldskyddets anliggningskraft mot det skyddade föremål har därvid uppgått till ca. 136 kp.The diaphragm 8 is provided with a number of concentric, annular beads 17, 18, 19, 20, 21 of such height that the top part of the beads abuts against the underside of the cover under part 3. The force with which the suction cup plate 11 is pulled upwards when rotating the cover upper part 2 will then be transferred through the cover and from the cover to the tops of the beads down to a wide circular ring area located along the edge of the diaphragm 8. At the specified dimensions a pressure of 0.6 bar has been measured inside the space 11 when the suction cup occupies it with dashed 462 The lines shown in Fig. 1 and the abutment force of the anti-theft device against the protected object have thereby amounted to approx. 136 kp.

Det inses att ansugningskraften är proportionell mot vrid- ningsvinkeln av kåpans övre del 4 och gängans 13 stigning.It will be appreciated that the suction force is proportional to the angle of rotation of the upper part 4 of the cover and the pitch of the thread 13.

För vridning av kåpans övre del 2 finns en manöverarm 23 som vid ett gångjärn 24 är ledbart fastsatt vid kåpans övre vridbara del 3 för att tjäna som en vev vid vridning av kåpan i samband med stöldskyddets ansättning resp. borttagande från det skyddade föremålet. I den fria änden av' manöverarmen finns en konventionell nyckelmanövrerad låscylinder 25 med en låstapp 26 vilken samverkar med en låsklack 27 för låsning av manöverarmen i det i fig. l med heldragna linjer visade infällda läget. Låsklacken 27 utgöres av ett spår i mantelytan av spindeln 14. Enligt ett alternativt utförande kan låsklacken utgöras av en med streckade linjer i fig. 1 visad låstapp 28 som är fast kopplad till plattan ll. En öppning 29 är anordnad i kåpans övre parti 4 diagonalt i förhållande till gångjärnet 24 på motsatt sida om centrum av kåpans övre vridbara del 2.For rotating the upper part 2 of the cover, there is an operating arm 23 which at a hinge 24 is hingedly attached to the upper rotatable part 3 of the cover to serve as a crank when rotating the cover in connection with the theft protection resp. removal from the protected object. At the free end of the control arm there is a conventional key-operated locking cylinder 25 with a locking pin 26 which cooperates with a locking lug 27 for locking the control arm in the retracted position shown in solid lines in Fig. 1. The locking lug 27 consists of a groove in the mantle surface of the spindle 14. According to an alternative embodiment, the locking lug can be constituted by a locking pin 28 shown in broken lines in Fig. 1 which is fixedly connected to the plate 11. An opening 29 is arranged in the upper part 4 of the housing diagonally in relation to the hinge 24 on the opposite side of the center of the upper rotatable part 2 of the housing.

Denna öppning är avsedd att upptaga låscylindern 25.This opening is intended to receive the locking cylinder 25.

Uppfinningen kan på många sätt modifieras och varieras beroende på användningsområde. För bilrutor, vilka oftast är välvda, är det lämpligt att kåpan och sugkoppens skiva har cirkulär eller oval form. För monitorer vars fönster är väsentligen fyrkantiga kan det vara lämpliga att kåpan och membranet är väsentligen fyrkantiga medan plattan 11 har cirkulär form.The invention can be modified and varied in many ways depending on the field of use. For car windows, which are usually arched, it is suitable that the cover and the suction cup disc have a circular or oval shape. For monitors whose windows are substantially square, it may be appropriate for the housing and the membrane to be substantially square while the plate 11 has a circular shape.

Claims

462 D52 5 PATENT CLAIMS

Anti-theft device comprising - a metal cover (1) for mounting an object to be protected against theft or unauthorized use, - a lockable suction cup (8) arranged inside the cover capable of producing a retaining force greater than the breaking point of the material of the anti-theft article, - means for operating the suction cup, characterized in that said means for operating the suction cup comprises: - a plate (II) fixedly arranged at the suction cup, - a pin projecting from the plate and fixedly connected to the plate. (12) with a thread (13), - a spindle (14) which at its one end is fixedly arranged at the inside of the cover and which has an internal thread in engagement with the thread of the pin, - whereby rotation of the cover by a predetermined angle causes the spindle pulls up the plate and thus the suction cup with a force proportionally large to the angle of rotation of the cover. v

The anti-theft plate according to claim 1, characterized by an end stop (16) cooperating with the pin to limit the angle through which the cover can be rotated and thereby limit the suction force of the suction cup towards the protected object.

Anti-theft plate according to claim 1 or 2, wherein the cover has a substantially circular plate-like shape, characterized in that the suction cup is formed of a membrane (8) of rubbery material whose shape corresponds to the circular shape of the cover and whose size is insignificantly smaller. than the cover so that the cover from the top protects the disc against unauthorized exposure.

Anti-theft plate according to claim 3, characterized in that the thickness of the membrane (8) is tapered in the radial direction in the radially outermost portion of the housing and that the radially outermost portion (9) of the housing extends radially outwardly beyond the outermost edge of the membrane and in addition, runs down towards the surface of the protected object to form a minimal gap (10) which substantially prevents unauthorized insertion of objects under the cover.

Anti-theft plate according to claim 3, characterized in that the membrane (8) is provided with a number of concentric, annular beads (17, 18, 19, 20, 21) of such a height that the ridge portions of the beads abut against the underside of the cover for absorbing the force with which the suction cup plate (11) is pulled upwards when the cover is rotated and transmitting this force to a wide circular ring area (22) located at the edge of the diaphragm (8).

Anti-theft plate according to one or more of the preceding claims, characterized in that the plate-like cover is divided into two parts, an upper part (2) and a lower part (3), along an imaginary line of intersection which lies in a plane parallel to the bottom surface (4) of the plate and the upper and lower parts are rotatably connected to each other by means of a sliding bearing (5).

The anti-theft plate according to claim 6, characterized in that the sliding bearing comprises a grooved ring fixedly connected to one housing part and that the other housing part has a radially inwardly extending flange (7) which is slidably received in said groove.

The anti-theft plate according to claim 1, which comprises a lockable operating arm known per se, characterized in that the only operating arm (23) is hingedly attached to the upper rotatable part (2) of the cover to serve as a crank for turning the cover. in connection with the theft protection's employment against resp. removal from the anti-theft object.

Anti-theft plate according to one or more of the preceding claims, characterized in that one end of the control arm is fastened to the upper rotatable part (3) of the cover by means of a hinge (24) and that the control arm has at its opposite end a locking cylinder (25) with a locking pin (26) which cooperates with a locking lug (27).

Anti-theft plate according to claim 8, characterized in that the cover has in its upper part (4) an opening (29) for the locking cylinder, which opening is arranged diagonally with respect to the hinge on the opposite side of the center of the upper part (2) of the cover. .