Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Cap over the head
Reexamination Certificate
2000-04-18
2001-07-24
Saether, Flemming (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Cap over the head
C411S015000, C411S041000, C411S045000
Reexamination Certificate
active
06264413
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fastening element for attaching plate-shaped boards and including a large-surface clamping member, a hollow stem projecting from the clamping member and having a bore opening at the clamping member for receiving an expansion member for an anchoring member with which a plate-shaped board is secured to a constructional component, and a shaped member attached to the clamping member with a strap for closing the bore by being inserted therein.
2. Description of the Prior Art
Insulation materials, in particular, insulation boards are used for heat insulation and partially also for noise insulation of walls and ceilings. Conventionally, the insulation boards are secured to a raw masonry. For securing the plate-shaped insulation materials, fastening elements, which have a large-surface, flat clamping plate from which a stem projects, are used. The stem extends into the insulation board. The fastening element is secured to the masonry primarily with a dowel-like or nail-like anchoring member that forms an extension of the stem. The dowel-like anchoring member is inserted in a pre-drilled bore formed in the masonry and in anchored in the masonry bore by being expanded. A nail-like anchoring member is directly driven into the masonry, without preliminarily forming a bore in the masonry. A bore formed in the stem and opening into the clamping member insures access for an expansion screw or a similar expansion member used for expanding the dowel-like member or to a nail-like member. After the masonry is covered with the insulation material plaster is applied.
German Utility Model DE-U-91 03 388 discloses a fastening element of a type described above for securing a plate-shape insulation material to a masonry and in which a closing member is provided for the bore accessible from the clamping plate. The closing member prevents penetration of the plaster into the bore. The closing member may have different forms, e.g., the closing member can be formed as a plug-like member that, after being form-lockingly inserted in an annular groove, is retained on the bottom of the bore. The drawback of the fastening element disclosed in the German Utility Model consists in that the bore is not sealingly closed. Therefore, a complete seal is not provided which can result in heat losses and in discoloration of the plaster. An expansion screw or an expansion nail-like member, with such fastening element, is not adequately protected from moisture. The closing member is connected with the clamping plate by a thin strap. During mounting, often, the closing member is in the way and need be kept by a worker away from the bore. During mounting, a large number of fastening elements need be kept in a box, and the closing members, which are connected to respective clamping plates by straps, can interlock with each other or with the clamping plates. Upon placing the boxes in a transporting receptacle or during the removal of the fastening elements, the straps can be torn. As a result, some of the fastening elements would remain without the closing members, and respective bores could not be closed.
Accordingly, an object of the present invention is to eliminate the drawbacks of fastening elements of the prior art.
Another object of the present invention is to provided a fastening element that can be easily handled and accessed.
A further object of the present invention is to provide a fastening element in which the opening in the clamping plate can be sealingly closed so that a vapor barrier is provided, and the penetration of moisture into the bore is prevented.
A still further object of the present invention is to provide a fastening element which would insure an easy handling of the closing member.
Also, an object of the present invention is to provide a fastening element in which interlocking of the closing member with the clamping plate or member and the separation of the closing member therefrom is prevented.
SUMMARY OF THE INVENTION
These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a fastening element including a large-surface clamping member, a hollow stem projecting from the clamping member and having a bore opening in the clamping member. The hollow stem is designed for receiving an expansion member for an anchoring member which is coaxial with the hollow stem and with which a plate-shaped board is secured to a constructional component. The bore is closed with a plug-shaped member which is attached to the clamping member with a strap and which closes the bore by being inserted therein. The closing member has a plug-in section having a sealing surface which, in its inserted condition, sealingly cooperates with a wall of the bore and is force-lockingly retained therein. The plug-in section has at least one recess provided with an undercut and a largest diameter of which corresponds to a diameter of a stem of the expansion member for enabling the closing member to eclipse the stem of the expansion member.
The cylindrical sealing surface of the plug-in section of the closing member, which cooperates with the bore wall, insures a sealing of the bore from outside. Thereby, an effective vapor barrier is provided and penetration of moisture into the bore is prevented. This permits the use of the fastening elements with an expansion member which is not formed of stainless steel and does not have a corrosion-resistant coating. Because the plug-in section has at least one undercut recess, the closing member eclipses the stem of the expansion member already during the pre-assembly of the fastening assembly. Due to the fact that the closing member occupies a precisely defined position, interlocking and separation of the closing member does not take place anymore. The handling of the fastening element is facilitated because during the assembly, the closing member need not be removed from the mouth opening of the bore in the clamping member.
In order to insure an easy eclipse of the stem of the expansion member and an adequate retention of the closing member on the stem of the expansion member, while permitting an easy release of the closing member, advantageously, the recess has an arcuate shape a circumferential profile of which extends over an angle from about 185° to about 330°.
Independent of the shape of the recess proper in the plug-in section, the undercut depth is preferably amounts from about 10% to about 45° of the largest width of the recess.
In order to insure a good and acceptable sealing function of the closing member, a portion of the plug-in section carrying the sealing surface is adjoined by a conical entrance region inclined with respect to the axial extension of the plug-in section at an angle from about 5° to about 30°.
For manufacturing reasons and in order to reduce consumption of materials, the plug-in section is formed as a tubular section. The fastening element is usually made of a plastic material and is produced by an injection-molding process. In order to be able to easily remove the core during the formation of the tubular plug-in section with a conical entrance region, the conical entrance region is provided with axially extending slots.
To facilitate the eclipsing of the stem of the expansion member by the closing member, the plug-in section is provided with two undercut recesses which are arranged diametrically opposite each other.
Because the expansion member has a countersunk head the surface of which is inclined to the stem of the expansion member and forms therewith an angle amounting to from about 105° to about 170°, the closing member is automatically released off the stem upon the expansion member being driven in the bore of the hollow stem. The available conical entrance region of the plug-in section provides for an automatic alignment of the closing member with the mouth opening of the bore. For closing the bore, the closing member simply need be inserted thereinto.
In a preferred embodiment of the fastening element according to
Belz Thomas
Bisping Heinz
Daigeler Erich
Hausner Wolfgang
Hilti Aktiengesellschaft
Saether Flemming
Sidley Austin Brown & Wood LLP
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