Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Double-ended
Patent
1996-09-06
1998-06-23
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Double-ended
411388, F16B 3500
Patent
active
057695830
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a connecting element with thread on both sides for a detachable connection of two component parts or objects according to the preamble of claim 1.
Connecting elements have been known which in their center show a screw nut and at the two opposite ends each comprise a thread. These connecting elements have been constructed from one pierce for example by forging. The special characteristic of these connecting elements is that one thread is right-handed, however the other thread is left-handed by which according to the turn direction of the nut two component parts or objects connected by thread bottom hole borings and the two threads of the connecting element either withdraw from each other or approach each other. A very particular characteristic of these connecting elements is that by the latter a defined distance between the two component parts or objects can be adjusted.
Furthermore it has been known that these connecting elements consist of one piece because of which a possible alignment of the two component parts or objects cannot be compensated.
Moreover, when assembling these known connecting elements for a detachable connection of the two component parts or objects there will arise further problems. To screw the connecting element into both component parts or objects at the same time these two component parts or objects must be arranged in an initial distance which is at least as long as the length of the connecting element. This is impossible at hardly accessible places or considerably restricts the serviceability of such a connecting element. Furthermore, when assembling the two component parts or objects they must additionally be aligned with each other in an exact manner because of the rigid one-piece construction of the connecting element.
Therefore it is the object of the present invention to avoid the above-mentioned disadvantages of a detachable connection of two component parts or objects and particularly to create a connecting element which can be used at hardly accessible places and is constructed in a simple and robust manner and easily to be handled.
This object is solved by means of a connecting element consisting of several joinable parts the two thread parts of which are right- as well as left-handed according to the characteristics described in the characterizing clause of claim 1 of the corresponding patent claims. The present invention allows a considerable reduction of the assembly time and thereby of the expenses of assembling. Furthermore, when renouncing the passage borings also these elements can be connected to each other which otherwise are not accessible from any side or are only hardly accessible and/or, because of restricted space conditions, are accessible in a complicated manner only.
In the following there will be described a preferred embodiment of the invented connecting element with the help of the enclosed drawings.
In these drawing the figures show the following:
FIG. 1: The cross-section of the connecting element in assembly condition with the two component parts or objects,
FIG. 2: A lateral view and a cross-section of the joined connecting element,
FIG. 3: The construction of the base screw in side view and in cross-section the construction of the secondary screw,
FIG. 4: Plan view and cross-section of the clamping nut,
FIG. 5: As lateral view different dimensions of the base thread of the base screw,
FIG. 6: Plan view and lateral view of various designs of the clamping nut.
The connecting element (1) in FIG. 1 serves for detachable connection of two objects or component parts (2, 3), particularly for connecting two objects (2, 3) at places inaccessible or only hardly accessible by one or both object sides, e.g., walls erected to separate rooms.
FIG. 2 shows the inner and exterior composition of the preferred embodiment of the connecting element (1) consisting of the three components base screw (4), secondary screw (5), and clamping nut (6) in assembled condition.
The base screw (4) shown in FIG. 3 comprises a right-handed base th
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N.N.: Unsichtbare Steckverbindungsschraube. In: Deutsche Bauzeitung, dbt Mar. 1964, 16, S.229; Abs.4.
Estremsky Gary
Lindsey Rodney M.
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