Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1991-10-01
1993-02-16
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 51, 411908, F16B 1306, F24F 700
Patent
active
051865904
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention concerns a multipart dowel. One particularly suitable field of application is for fixing building materials, e.g. fabric made from textile material or fiberglass, to walls or ceilings. The dowel is designed to enable such flat materials to be evenly laid. In other words, having been driven in, the dowel is designed to enable the wall covering to be adjusted transversely to the plane of a wall or ceiling.
SUMMARY OF THE INVENTION
A multipart dowel constructed in accordance with this invention comprises a sleeve with an approximately cylindrical shaft, a core, and thread means for coupling the core to the sleeve. The thread means includes helical grooves famed in the shaft in a stellate engagement forming the female part of the thread and matching helical ribs on the core for the male thread. The thread means has a lead greater than the length of the thread means. The sleeve has a front part, said front section disposed in core made a well hole, said grooves terminating at said front part with slots extending to the outer wall of the sleeve. Ventilation means are provided through the dowel.
In use, the sleeve of the dowel is inserted into a hole drilled in the wall or ceiling. The core is then driven in with a hammer or drill hammer, its helical ribs engaging the helical grooves of the sleeve. Whilst being driven in, the core advances a partial, e.g. a half, revolution against the sleeve. The front part of the sleeve expands whilst the core is being driven in, in the same way as an expansion dowel, thus firmly fixing the dowel within the drill holes.
Preferably, at least on, and normally all the ribs of the core are each provided with an air vent groove extending over their full length, these grooves being open to the outside, thus providing ventilation for the wall or ceiling.
The thread means may be formed of differing numbers of ribs or grooves. Preferably, there should be three matching ribs and grooves in a mutual stellate arrangement.
If the sleeve and core each have a disc type head, the materials mentioned above can be placed between both. The core can be adjusted relative to the sleeve by a screwing action, and this can be facilitated by the head of the core being formed as a screw head. In addition to its head, the core can be formed with a spacer plate spaced axially from the head, enabling the materials to be suspended in between the spacer plate and the head.
Wire netting cannot be stretched out sufficiently widely by force to be hung over a disc type head without causing damage. Fitting this material can be made possible by the addition of a fastener, designed to be anchored to the core by means of a projection into a channel in the dowel core open to the outside. The wire netting can then be laid on the disc type head of the core, and the projection of the fastener stuck through the netting and finally anchored into the outer end of the core.
For this purpose the fastener can be press-stud type system, or by forming the projection of the fastener and the inside of the channel as matching second thread, the leads of which may also be greater than their length, so that the projection needs, for example, only half a turn before it is completely driven in.
In order to provide ventilation for the wall when a fastener is used, an air hole can be provided in the bottom of the channel, and another ventilation path leading outwards can also be provided between the channel and the projection of the fastener.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows in side view the sleeve of a multipart dowel in accordance with the invention.
FIG. 2 shows a side view, with part in cross-section, of the matching core.
FIG. 3 shows a side view of a matching fastener.
FIG. 4 is a frontal view along lines IV--IV in FIG. 1.
FIG. 5 is a cross-section along line V--V in FIG. 1
FIG. 6 is a partial end view along line VI--VI in FIG. 2, considerably enlarged.
FIG. 7 shows a side view an alternate embodiment of the core with a spacer plate.
FIG. 8 is
REFERENCES:
patent: 3393599 (1968-07-01), Fisher
patent: 4085651 (1978-04-01), Koscik
patent: 4391559 (1983-07-01), Mizusawa
patent: 4856950 (1989-08-01), Bushnell
patent: 4878791 (1989-11-01), Kurihara et al.
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