EP0277290B1 - Panel with symbol fields with hidden fastening screws - Google Patents

Abstract

There is a panel, in which a carrier plate (2) and a backplate are combined and are provided with passage holes (12) for at least one inserted fastening screw (22) with head (23), in which the carrier plate (2) has windows (3) and crosspieces (7) crossing these and limiting with the window edge slots, and in which there are on the backplate ribs which project into the slots. It is desirable if the unauthorised loosening of the fastening screw becomes more difficult. This is achieved in that the passage hole (10) of the carrier plate (2) is provided in a crosspiece (7) and the ribs of the backplate are omitted in the two slot regions adjacent to the passage hole (10). The head of the fastening screw is concealed by the field, that is to say is invisible, so that only the expert knows where the fastening screw is, whereas the layman is prevented from loosening the fastening screw. <IMAGE>

Description

The invention relates to a sign in which a support plate and a back plate are put together and are provided with through-holes for at least one fastening screw to be inserted with a head, in which the support plate has windows and transverse webs crossing these, which delimit slots with the window edge, in which in the Window fields are set, which reach through the slots with resiliently bendable legs and reach behind the edge of the slot, on which ribs are provided on the back plate, which protrude into the slots next to the legs and in which the support plate at the through hole via a support projection against the back plate is supported.

The sign gives e.g. Notes on the location of water or sewer connections on roads. In a known (DE-C-10 99 334) shield of this type, the through hole of the carrier plate is in the body of the carrier plate, i.e. provided outside the window. The screw head is accessible from the outside, so that the fastening screw can be loosened by anyone using a screwdriver. All fields are secured against removal from the front with the rear plate attached, by assigning a rib to each field leg, which deprives the leg of any movement in the slot, so that the hooking of the rear grip cannot be released.

An object of the invention is now to provide a shield of the type mentioned, in which the unauthorized loosening of the fastening screw is difficult. The shield according to the invention is solving this problem, characterized in that the through hole the support plate is provided in a crosspiece and the ribs of the back plate are omitted in the two slot regions adjacent to the through hole.

The head of the fastening screw is covered by the field, i.e. invisible, so that only the expert knows where the fastening screw is, whereas the non-expert is prevented from loosening the fastening screw. Since the person skilled in the art cannot loosen the covering field from the front of the shield when loosening the fastening screw, if it is secured by ribs, the ribs are omitted only for the head-covering field. This field can be easily removed from the front by the expert, but only by chance by the non-expert, since the other fields are saved.

The fastening screw with a concealed head holds e.g. only the support plate together with the back plate. However, it is particularly expedient and advantageous if the fastening screw, the head of which is covered by the field, engages behind a shield on a support device. As long as such a fastening screw is not loosened, the carrier plate cannot be separated from the back plate.

It is also particularly expedient and advantageous if only one or two fastening screws with a head covered by a field are provided. There is less chance that a non-expert will come across an unsecured field if there are only one or two secured fields.

It is particularly expedient and advantageous if the two fastening screws provided with a concealed head end on one post crossing Attack the bracket. The post is provided, for example, between the shield and the bracket, the fastening screws being screwed into the ends of the bracket, or the bracket is part of a clamp placed on a post. This post-bracket attachment of the shield is a preferred embodiment of the invention.

It is then particularly expedient and advantageous if the through hole in the crosspiece is designed as a countersink and in the support projection has the diameter assigned to the fastening screw. It is not necessary to provide the field with a recess for the head and the support projection which is integral with the carrier plate forms the actual abutment for the head of the fastening screw. The support projection therefore not only supports the carrier plate against the back plate in the area of the fastening screw.

Another embodiment of the invention is that releasable connecting means are provided at the corner areas only for connecting the support plate and back plate and that each connecting device is formed by a sleeve and a pin which is stuck in it and which are integral with the support plate and with the back plate . A shield is created in which, while avoiding screws, the firm connections of the corner areas are carried out in a manner that is concealed from the outside.

These socket-spigot connections are not visible from the outside, so that their solution is difficult for the non-expert. The person skilled in the art can loosen the socket-spigot connections of the plate removed from the supporting device with considerable force using a tool. They are screw devices avoided and socket and spigot are also molded when the carrier plate and the back plate are manufactured.

The press fit of the pin in the sleeve can be achieved by choosing the diameter of the pin slightly larger than the inside diameter of the sleeve. Since this requires tolerance-free production, it is particularly expedient and advantageous if longitudinally formed molded-on ribs of small cross-section are provided between the sleeve and the pin. The ribs equalize tolerances and convey the tight fit of the spigot, which does not actually touch the socket. The ribs are deformed when the pin is pressed in and thus give a very firm, yet releasable frictional connection between the pin and the sleeve.

It is particularly expedient and advantageous if four ribs are distributed over the circumference. The connection between the spigot and the socket is often not very tight with three ribs and a fifth rib is superfluous.

It is also particularly expedient and advantageous if the carrier plate and the back plate have an opening in each connecting device and if the pin is provided with an axial bore which connects the two openings. A fastening screw can be inserted through the socket-spigot connection in order to attach the sign to a carrying device.

It is particularly expedient and advantageous if the opening of the carrier plate is blocked off from the outside by a transverse wall of reduced thickness.

Fig. 1

eine Rückansicht einer Trägerplatte eines Felder-Schildes mit Befestigungsschrauben,

Fig. 2

einen Schnitt gemäß Linie II-II in Fig. 1,

Fig. 3

einen Schnitt gemäß Linie III-III in Fig. 1,

Fig. 4

einen Teil der Vorderseite der Trägerplatte gemäß Fig. 1,

Fig. 5

einen Teil der Innenseite einer Rückplatte, die zu der Trägerplatte gemäß Fig. 1 gehört,

Fig. 6

einen Schnitt gemäß Linie VI-VI in Fig. 5,

Fig. 7

in einem gegenüber Fig. 5 vergrößerten Maßstab eine Einzelheit Y im Schnitt und

Fig. 8

in einem gegenüber Fig. 1 vergrößerten Maßstab eine Einzelheit X im Schnitt.

In the drawing, a preferred embodiment of the invention is shown and shows

Fig. 1

a rear view of a carrier plate of a field shield with fastening screws,

Fig. 2

2 shows a section along line II-II in FIG. 1,

Fig. 3

2 shows a section along line III-III in FIG. 1,

Fig. 4

part of the front of the carrier plate according to FIG. 1,

Fig. 5

part of the inside of a back plate belonging to the carrier plate according to FIG. 1,

Fig. 6

5 shows a section along line VI-VI in FIG. 5,

Fig. 7

on an enlarged scale compared to FIG. 5, a detail Y in section and

Fig. 8

on an enlarged scale compared to FIG. 1, a detail X in section.

The shield according to the drawing is made of a thermoplastic material by injection molding and has a back plate (1), a carrier plate (2), fields, not shown, two fastening screws, not shown, and a support device, not shown, which is designed as a U-shaped bracket which crosses a vertical post, which is arranged between the bracket legs, into which the fastening screws are screwed. The support plate (2) has rectangular windows (3) of different sizes, in which the fields (not shown) are placed, which are provided with signs towards the front and have two legs projecting at right angles to the rear, each of which has a step-like protrusion at the free ends Wear latch. Each window (3) delimits a slot (4) with two opposite edges and each field is pushed with the two legs through the two slots (4) of a window (3), the lugs behind the two window edges delimiting the slots grasping.

On the back of the carrier plate (2), a peripheral ledge (5) is provided on the outside, on which the attached rear plate rests, and a ledge (6) is provided around each window (3), the height of which is perpendicular to the carrier plate is less than the edge of the ledge (5). Each window (3) is spanned by a cross piece (7) which is integral with the support plate (2) and which is at a distance corresponding to the thickness of the window from the front of the support plate and which has a reinforcing ledge (8) at the back of the slot (4). With the exception of an exception described below, each slot (4) is assigned a rib (9). The narrow, elongated ribs (9) are provided in one piece on the back plate (1) and, when the back plate is attached, protrude into the slots (3) between the crosspiece (7) and the leg of an inserted field.

In the center area of the support plate (2), the crossbars (7) of only two windows (3) are each provided with a through hole (10) which also extends to an annular support projection (11) which is at the back of the support plate with the same height as the ledge (5) protrudes. The through hole (10) in the area of the crossbar (7) is designed as a larger diameter (12) for receiving a screw head and has in the support projection (11) the diameter to be assigned to the screw shank. The distance of each through hole (10) from the lateral outer edge of the carrier plate (2) is greater than a third and only slightly less than half the distance between the two through holes (10) from each other. The position of the through holes (10) is placed on the support device designed as a U-bracket. Each through hole (10) of the carrier plate (2) is assigned a through hole (13) of the back plate (1). As shown in FIG. 5, no ribs are provided at the points (14) assigned to the through holes (3), to which ribs are to be assigned for securing the field. In Fig. 3, a fastening screw (22) with a head (23) is indicated.

The carrier plate (2) has four corner areas (15), in each of which a sleeve (16) is formed on the side facing the rear plate (1). The sleeve (16) has an inner diameter which is larger than that of an opening (17) which is provided in the carrier plate and is covered by the sleeve and which is covered towards the front of the carrier plate by a relatively thin, membrane-like transverse wall (18). The height of the sleeve (16) at right angles to the support plate (2) is as great as that of the ledge (5) on the edge. The back plate (1) has a pin (19) on the side of the ribs (9) in the corner areas (15), which is provided with an axial bore (20) which passes through the back plate and which, when the back plate is attached, has the opening (17) is aligned. The outside diameter of the pin (19), which is circular in cross section, is one game smaller than the inside diameter of the sleeve (16), which is circular in cross section. However, the pin (19) has four ribs (21) evenly distributed on the outside around the circumference, which end at a distance from the free end of the pin (19) and of which only two are shown in FIG. 7. The ribs (21) are very small in cross section, fill the last-mentioned game and are so large in the radial direction that the pushed-on sleeve (16) sits tightly and firmly on the pin.

Claims (10)

1. A sign, with which a carrier plate and a backplate are fitted together and provided with through holes for at least one headed fastening screw which is to be passed therethrough, with which the carrier plate has windows (3) and crossbars (7) which traverse the latter and together with the window edge define slits (4), with which panels are placed into the windows, these panels gripping through the slits and gripping the slit edge behind by means of resiliently bendable legs, with which ribs (9) are provided on the backplate, these ribs projecting into the slits by these legs, and with which the carrier plate is, at the through hole, supported against the backplate via a support projection, characterized in that the through hole (10) of the carrier plate (2) is provided in a crossbar (7) and the ribs (9) of the backplate (1) are omitted in both slit (4) areas adjacent to the through hole.
2. A sign in accordance with Claim 1, characterized in that behind the sign the fastening screw, the head of which is concealed by the panel, engages on a bearing device.
3. A sign in accordance with Claim 1 or 2, characterized in that only one or two fastening screws having a panel-concealed head are provided.
4. A sign in accordance with Claim 3, characterized in that the two fastening screws with a concealed head which are provided engage on a clamp traversing a post.
5. A sign in accordance with any one of the preceding Claims, characterized in that the through hole (10) in the crossbar (7) is constructed as a countersink and in the support projection (11) its diameter is that assigned to the fastening screw.
6. A sign in accordance with any one of Claims 2 to 5, at the corner regions detachable connecting devices only being provided to connect the carrier plate and the backplate, characterized in that each connecting device is formed from a sleeve (16) and a pin (19) jammed tight in the latter in a clamped manner, this sleeve being in one piece with the carrier plate (2) and this pin being in one piece with the backplate (1).
7. A sign in accordance with Claim 6, characterized in that moulded-on ribs (21) which have a small cross-section and run in the longitudinal direction are provided between the sleeve (16) and the pin (19).
8. A sign in accordance with Claim 6 or 7, characterized in that four ribs (21) are distributed over the circumference.
9. A sign in accordance with Claim 6, 7 or 8, the carrier plate and the backplate having an opening at each connecting device, characterized in that the pin (19) is provided with an axial bore (20) which connects the two holes (17).
10. A sign in accordance with any one of Claims 6 to 9, characterized in that the opening (17) in the carrier plate (2) is blocked toward the outside of the latter by a transverse wall (18) of reduced thickness.

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