Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1995-08-15
1998-02-17
Meyers, Steven N.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 41, 411 45, 411 60, F16B 1304
Patent
active
057185476
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT. application PCT/DE94/00107 filed 4 Feb. 1994 with a claim to the priority of German application G 93 02 257.2 itself filed 17 Feb. 1993.
FIELD OF THE INVENTION
The invention relates to a securing device for a blind undercut bore in which is arranged an anchor plug longitudinally slit toward the floor of the bore and which is provided on its inner end with spreadable tongues having a shape corresponding to the undercut of the bore and which has a coaxial passage for insertion of a bolt which engages the spreadable tongues over substantially all of their overall length.
BACKGROUND OF THE INVENTION
Such a securing device is known from EP 0,336,183. It is intended for mounting a threaded part. Accordingly the plug or its bore has an internal screwthread in which the threaded part can be screwed. In this way the spreadable tongues that are pushed together for insertion of the plug into the bore are spread as long as the elasticity of the material of the plug does not allow for an automatic spreading of the spreadable tongues when the plug is installed. When the threaded part is screwed in it transmits spreading force to the plug. The front edge of the threaded part presses against unspread regions of the plug. As a result it is not uncommon that the threaded engagement between the threaded part and the plug is damaged and the spreadable tongues are not spread or are only partially spread. This is in particular the case when the plug has not been inserted deeply enough or when because of some tolerance problems during formation of the bore this is not radially and/or axially big enough. In these cases it is hard to prevent that the known threaded part does not get screwed in deeply enough. Such a problem crops up because the threaded part projects out of the bore in order to secure a mounted part, for instance a holding plate, which is connected via a threaded nut with the bore support. In this way one gets an insufficiently solid and as a result not strong load-bearing connection between the bore support and the object being mounted. In addition this can lead to damage to the bore support when the threaded part is threaded with excessive force into the plug and same bursts the bore support because it is correspondingly sensitive. Such sensitivity is particularly present when the bore support is a thin plate for which the securing device is in particular intended. The bore support can also be a ceramic plate which can be broken by incorrect use of the known securing device.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to improve on a securing device of the above-described type so that it provides a good and easily monitored mounting possibility in particular with thin plates as bore supports and which is easier to install.
SUMMARY OF THE INVENTION
This object is attained in that the bolt is a drive bolt free of external screwthreads on its outer surface and has an outer end that is arranged generally axially flush with the outer end of the plug.
It is important for the invention that the bolt is a drive bolt with a smooth outer surface. It can therefore simply be driven into the plug. This way it spreads the spreadable tongues of the plug so long as they are not sprung into the undercut and holds the spreadable tongues in the undercuts of the bore when it is fully driven in, when its outer end is flush with the outer end of the plug. If the plug is not fully inserted into the bore, the complete insertion of the plug will take place with the driving-in of the bolt. To this end an angling of the undercuts is particularly effective. The resultant friction between the outer surface of the bolt and the inner wall of the bore of the plug are sufficient to axially drive in same. An axial interengagement between the bolt and the plug comparable to the threaded engagement of the known threaded part in the inner thread of the known plug, does not exist. The plug therefore does not serve as an abutm
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Conley Fredrick
Dubno Herbert
Meyers Steven N.
Wilford Andrew
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