An attachment device

Abstract: A device for attaching a plate or cap over an opening, comprising a rod or wire extending from the front through the plate or cap. On the end of the rod or wire extending into the opening, there is provided a spring clamp whose end remote from the rod or wire has a sharp point.

Description: This invention relates to a device for attaching a plate or cap over an opening in a wall comprising a rod or wire one end of which, in a mounted position, engages directly or indirectly said plate or cap and another end of which, in a mounted position, engages directly or indirectly the wall within the opening to fasten the device. A device of this type is known from DE-A-1 125 722. In this known device, which is especially designed for passing a cable or tube through the opening in the wall, a protection tube, which is adjacent to the inner side of the opening in the wall, comprises means for engagement of the rod or rods with said protection tube. The protection tube and the means for engagement of the rod or rods with said protection tube require a specific configuration of the opening in the wall. From EP-A-0 244 514 a device is known whereby, for passing a cable through an opening in a wall, use is made of a cap for covering the opening around the cable, said cap being provided with an opening for passing the cable, while the peripheral rim is screwed onto the wall. The cap further contains an opening for introducing liquid synthetic resin which, after its introduction, will foam so that a part of the expanding synthetic resin penetrates into the opening, thereby sealing it. Such a method of application requires the use of a drilling machine for providing openings for attachment of the screws. The use of a drilling machine requires the provision of a power supply. Another problem in this respect is the consistency of the material of which the wall is made. In certain cases, this material is such that crumbling or chipping takes place, so that the cap fails to become properly secured and may get detached from the wall when stresses occur due to the expansion of the synthetic resin, a a result of which the foaming material flows away laterally instead of flowing into the opening to be sealed. It is an object of the present invention to remove this drawback. To that effect, the device of the above described type is characterized in that the other end of the rod or wire extending within the opening is provided with a spring clamp having at least one sharp point at an end part remote from the rod or wire, which sharp point or points, in a mounted position of the device, engage the wall within the opening to fasten the device. As used herein, and in the appended claims, the term "spring clamp" means a resiliently clamping element or clip. The one end of the rod or wire may extend through the cap or plate and may have a bent portion which engages directly with the cap or plate at a front side, i.e. at a side remote from the wall, thereof, while the other end may be provided with two wire-like portions serving as said spring clamp and arranged at an acute angle and oriented towards said one end. In that embodiment the two wire-like portions can be connected to the rod or wire by means of welding, soldering or the like. Another possibility is that the two wire-like portions serving as said spring clamp are bent from a single wire which also forms said rod or wire. In a further elaboration of the present invention one end of the spring clamp, connected to the rod can be parallel to the axis of said rod, while the sharp point means of the end part of said clamp remote from said rod terminates at least partly normal to the axis of the rod. For facilitating the attachment of the threaded rod the one end of the rod can be provided with threading which engages indirectly with said plate or cap, by means of a threaded bush extending through an opening of the plate or cap. A simple construction is obtained when the spring clamp is fixedly connected to the rod. This can be effected by welding or soldering the spring clamp onto the threaded rod. Another possibility, however, is for the spring clamp, at the one end part connected to the threaded rod, to be provided with a threaded bush affixed thereto and adapted for cooperation with the threaded rod. In a further elaboration of the present invention, the spring clamp can be constructed in such a manner that a cable can extend therealong in mounted condition. To that end, the end part of the clamp remote from the rod can have a curved, preferably cup-shaped, and, in development a fish tail configuration. Some embodiments of the device according to the invention for attaching a cap over an opening will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a diagrammatic side view of the device for attaching a cap over an opening in a wall; Fig. 2 is an elevational view taken on the line II-II in Fig. 1, with omission of the wall; Fig. 3 shows a development of the spring clamp according to Figs. 1 and 2; and Figs. 4 and 5 are elevational views similar to Fig. 1, showing two other embodiments of the device according to the present invention. As shown in the drawings, an opening 1 in a wall 2 is covered by a cap 3. The attachment of the cap takes place by tightening a threaded bush 4 over one end of a threaded rod 5, at the opposite end of which there is provided a spring clamp 6 by means of welding. Spring clamp 6, as shown, is curved, and fishtail-shaped, with the free ends of the fishtail-shaped portion terminating in sharp points 7, which, when bush 4 is tightened, readily engages the wall within the opening 2 accommodating the device. This arrangement enables a simple yet effective locking of the cap relative to the wall. By giving the spring clamp a curved and, in development, a fishtail configuration, a wire or cable 8 can be easily passed therealong, which wire or cable will not be damaged when the threaded bush is tightened. The cap 3 is provided in a known manner with a resilient sealing ring 11 for an effective sealing relative to the wall, while furthermore there are provided openings 10 to be shut off by filler plugs 9, through which openings liquid synthetic resin can be supplied. In the embodiments shown in Figs. 4 and 5, a conical cap 12 is retained over an opening 1 in a wall 2 by means of a wire or rod 13. Disposed between cap 12 and wall 2 is a resilient sealing ring 11. Wire or rod 13 essentially consists of a straight wire portion 14 having a bent end portion 15 extending through an opening, not shown, in the top of the conical cap 12. On the opposite end portion of wire 14, the latter is provided with two welded-on wire members 16. Members 16 are connected to wire 14 in such a manner that, in the mounted condition, they resiliently abut on the wall of opening 1. The construction described with reference to Fig. 4 requires a rod or wire with spring clamp the manufacture of which requires a number of operations, including a welding or soldering operation. In the embodiment shown in Fig. 5, this drawback is removed by a wire 13 bent from a single piece, whose shape will be self-evident in view of the above and which will therefore not be further explained. In view of the above, it will be clear that a great many modifications are possible within the scope of the present invention as claimed.

Claims: Device for attaching a plate or cap (3) over an opening (1) in a wall (2) comprising a rod or wire (5, 13, 14) one end of which, in a mounted position, engages directly or indirectly said plate or cap (3) and another end of which, in a mounted position, engages directly or indirectly the wall within the opening (1) to fasten the device, characterized in that the other end of the rod or wire (5, 13, 14) extending within the opening (1) is provided with a spring clamp (6, 16) having at least one sharp point (7) at an end part remote from the rod or wire (5, 14), which sharp point or points, in a mounted position of the device, engage the wall (2) within the opening (1) to fasten the device. Device as claimed in claim 1, characterized in that the one end of the rod or wire (14) extends through an opening in the cap or plate (3) and has a bent portion (15) which engages directly with the cap or plate (3) at a front side, i.e. at a side remote from the wall (2), thereof, while the other end is provided with two wire-like portions (16) serving as said spring clamp (16) and arranged at an acute angle and oriented towards said one end (15). Device as claimed in claim 2, characterized in that the two wire-like portions (16) are connected to the rod or wire (14) by means of welding, soldering or the like. Device as claimed in claim 2, characterized in that the two wire-like portions serving as said spring clamp are bent from a single wire (13) which also forms said rod or wire. Device as claimed in claim 1, characterized in that one end part of the spring clamp (6), connected to the rod (5) is parallel to the axis of said rod (5), while the sharp point or point (7) of the end part of said clamp (6) remote from said rod (5) terminate at least partly normal to the axis of the rod (5). Device as claimed in claim 5, characterized in that the one end of the rod (5) is provided with threading which engages indirectly with said plate or cap (3), by means of a threaded bush (4) extending through an opening in the plate or cap (3). Device as claimed in claim 5 or 6, characterized in that the spring clamp (6) is fixedly connected to the rod (5). Device as claimed in claim 5, characterized in that the spring clamp (6), at the one end part connected to the threaded rod (5), is provided with a threaded bush affixed thereto and adapted for cooperation with the threaded rod (5). Device as claimed in any of the preceding claims, characterized in that the spring clamp (6) is constructed in such a manner that a cable (8) can extend therealong in mounted condition. Device as claimed in claim 9, characterized in that the end part of the clamp (6) remote from the rod (5) has a curved, preferably cup-shaped configuration, and, in development a fish tail configuration.

Inventors: BAARS JAN, BAARS, JAN
Applicants: FILOFORM CHEM IND BV, CHEMISCHE INDUSTRIE FILOFORM B.V.
Application year: 1989
Main classification: H02G3
IPC codes: F16L5, H02G3