WO1986001851A1

WO1986001851A1 - A roller grating

Info

Publication number: WO1986001851A1
Application number: PCT/DK1985/000088
Authority: WO
Inventors: Henning Ivar Jensen
Original assignee: Bbp Silkeborg I/S V/Peter Woetmann & Bill Jensen
Priority date: 1984-09-11
Filing date: 1985-09-11
Publication date: 1986-03-27
Also published as: GB2176525A; DE3590444T1; DE3590444C2; SE8602118L; DK432384D0; SE460139B; GB2176525B; DK154717B; SE8602118D0; NO163500B; DK432384A; GB8609540D0; NO861844L

Abstract

By a roller grating for burglar securing of show windows and with a rollable grating mat consisting of a number of mutually parallel profiles (8), which at opposite longitudinal sides have outwardly open, countersunk grooves (10), wherein opposite end portions of grating links (14) are pivotally embedded, suitable distance pieces moreover being introduced into the grooves (10), the profiles (8) have in addition a longitudinal cavity (16) being adapted for receiving a reinforcement (18) extending preferably along the entire profile (8), said reinforcement consisting of a cylindrical reinforcement rod (18) of hardened steel, preferably being rollably mounted in said cavity (16) of the profiles (8). Hereby is obtained a roller grating with the known and popular appearance and which nevertheless in a closed and safe manner can be reinforced by placing hardened steel rods in said cavity.

Description

A Roller Grating.

The present invention relates to a roller grating of the type mentioned in the introductory clause of claim 1.

Rolling gratings of this type are to a great extent used for secur-hig against shop-lifting of particularly show windo s in shops such as goldsmith and silver¬ smith shops and radio and television shops. Most often the roller gratings are combined with other types of burglar securings, e.g. electronic alarm systems w ich are activated by a breaking of the plate glass, and which may possibly take care of the rolling down of the roller grating, if this has not by a mistake been rolled down in advance.

Normally the roller gratings are not rolled down during the hours of the s.hops, but at closing time the roller grating wi ll be rolled down and the electronic burglar alarm be activated. The activation of the elec¬ tronic alarm system at the closing time of the shops may possibly imply automatic rolling down of the roller gratings. It shall be mentioned that the most primary purpose of the roller grating is to make a burglary through the glass shop front so difficult that the police wi ll arrive before the grating has been broken, i.e. the mere presence of a roller grating has a very criminal preventive effect.

From SE-B-425,260 is known a Tollable securing grating consisting of horizontal profi les of a cuttable material. The profiles have two longitudinal holding grooves or recesses in which are engaged U or Z-shaped links of hardened steel, i .e. of an uncuttable material. The parallel portions of the links extend in said holding grooves and consequently also constitute distance pieces between the single links in the grating. This known roller grating is consequently rather heavy and expensive. Besides it has a remarkable weakness, as the horizontal profi les are easy to break through at the passage between the single links where the cuttable material of the profi les is not steel reinforced. From the Swedish Design Registrations No. 28866 and No. 28867 roller gratings are furthermore known consisting of a number of horizontal profi les of alumi¬ nium, which like the said known roller gratings have longitudinal holding grooves, wherein flat, curved links engage with cylindric portions at opposite ends of the links. The curved links are placed ith a vary¬ ing distance, apparently by means of cylindric distance pieces with corresponding different lengths inserted in the holding grooves. Apparently these known roller gratings consist completely of aluminium, i .e. without any special securing against the grating portions be¬ ing cut .

The invention has for its purpose to provide a roller grating of the i nt roducto ri ly mentioned type and which in a simple and safe manner can be reinforced as requi red .

The roller grating according to the invention is characterized in the profi les having a longitudinal cavity which is adapted for receiving a reinforcement, preferably extending along the entire profi le. Hereby is obta ned that a roller grating with the known and popular appearance in an easy and safe manner can be reinforced by placing hardened steel bars at the inside of the said cavity, i .e. without being cognized by an immediate look at the roller grating, what from a cri¬ minal preventive point of view is considered very im¬ portant, when considering the general criminal preventive effect .

According to claim 2 is obtained extremely suitable and safe reinforcement of the profi les of the roller grating, as attempts to saw through the profiles wi ll be very difficult, as the inserted reinforcement rods would roll when being attached with a saw blade.

The other claims provide suitable possibi lities for further reinforcing the roller grating by using grating links and distance pieces of hardened steel.

Altogether a roller grating is provided which can be armed according to requirements and with a correspond¬ ing possibi lity of obtaining a premium reduction when taking out an insurance, even without an externally visibly increased criminal preventive attitude being taken up, what is considered extremely important.

In the following the invention is described in more detai l, reference being made to the accompanying drawing, in which:- Fig. 1 is a side view partly in section of an embod ¬ ment for a roller grating according to the invention,

Fig. 2 a perspective view of a grating system according to the invention.

Fig. 3 a plan side view partly in section showing a preferred embodiment for a profi le with a reinforcement cavity respectively an inserted reinforcement rod for the grating according to the invention,

Fig. 4 a plan side view of another embodiment for a grating link for the roller grating according to the invention, and

Fig. 5 shows a front view of the grating link of Fig. 4 and a part of a distance piece for the roller grating.

The roller grating of Fig. 1 is mounted o r suspended on a pivotal tubular drum 2 and guided in the sideward direction in specially made guidings 4. The very grating (Fig. 2) consists of horizontal profi les 8 extruded in aluminium. At opposite longitudinal side edges the profi le 8 (Fig. 3) is provided with outwardly open part- cylindrical grooves or recesses 10, in which correspond¬ ing cylindrical connection portions 12 at opposite ends of curved grating links 14 are inserted. Between the single grating links 14 cylindrical distance pieces of different lengths are inserted according to the mesh size of the grating mat (Fig. 2) . The grating links 14 according to claims 1, 2 and 3 are cut off in suitable widths of a solid aluminium profile with corresponding profi ling, the grating links 14 being present in diffe¬ rent lengths corresponding to the width of the alu- profi le; from which the links have been cut. Behind the curved front side the horizontal pro¬ fi les 8 are extruded with a through-going cylindrical ca ity 16 which is adapted for receiving an also cy¬ lindrical reinforcement rod 18 of hardened steel. The reinforcement rod 18 has a slightly smaller diameter than the cavity 16, so that the reinforcement rod 18 is rollably mounted at the inside of the cavity 16.

Figs. 4 and 5 show a narrow curved grating link 20 which is made of hardened steel, the opposite cylin¬ drical connection portions 22 thereof being rolled up. At the bottom of Figs. 4 and 5 is shown a tube shaped distance piece 24 of hardened steel. This may consist of a rolled open tube bushing, or an ordinary thin-walled tube piece which after adjustment is hardened.

It has been found that the roller grating according to the invention can be adapted to almost any requirement as to the reinforcement degree, and that even without the roller grating noticeably changing its appearance from the current and popular appearance of today.

Claims

PATENT CLAIMS:

1. A roller grating, part cularly for burglar securing of show windows, and of a type where a Tollable grating mat- consists of a number of parallel profi les (8) of a cuttable material and positioned with a mutual distance, said profi les at opposite longitudinal sides having outwardly open countersunk holding grooves or recesses (10), in which opposite end portions of a plurality of grating links (14) are pivotally embedded, suitable distance pieces being introduced between the grating links (14) in said grooves (10), characterized in that the profi les (8) have a longitudinal cavity ⁽16) being adapted for receiving a reinforcement (18) preferably extending along the entire profi le.

2. A roller grating according to claim 1', characterized in that the longitudinal cavity in the pro i les is con¬ stituted by a cylindrical channel (16), in which an also cylindrical reinforcement rod (18) of hardened steel is ro I lab ly mounted.

3. A roller grating according to clai 1, characterized in that the grating links (20) and/or the distance pieces (24) consist of an uncuttable material, such as hardened steel.

4. A roller grating according to claim 3, characterized in that the grating Links (20) are made as narrow, flat curved links with rolled up, tube shaped end portions adapted for pivotal mounting in said grooves (10) .

5. A roller grating according to claim 3, characterized in that the distance pieces are made as length ise open tube bushings (24) .