Fastening device with removable axial guiding stop

Fastening device for assembling at least two elements, the fastening device comprising:

• a screw including a head and a threaded stem, the head being arranged proximate a first external surface of a first one of the elements to be assembled;
• a nut including internal threads for engaging with the stem of the screw, the nut being arranged proximate a second external surface of a second one of the elements to be assembled;
• removable guiding stop means, arranged between the first external surface and the nut, for providing, in a first stage, axial prepositioning of the screw and the nut and for permitting, in a second stage, penetration of the threaded stem of the screw into the internal threads of the nut through torquing of the screw and the nut, an axial force exerted on the guiding stop means during torquing of the screw and the nut causing the guiding stop means to clear the nut so that the nut engages with the first external surface of the first one of the elements to be assembled, the guiding stop means including an axial opening, the axial opening being of sufficient size to permit the stem of the screw to extend therethrough and to prevent passage of the nut therethrough, and an external top surface larger than an external periphery of the nut, the guiding stop means having an external side surface, the external side surface being conical in shape;
• and
• the guiding stop means having a length from one end to another, the first and second elements to be assembled have a thickness, and the stem of the screw having a length, the length of the guiding stop means, the thickness of the first and second elements to be assembled, and the length of the screw being such that, when the stem of the screw extends through the guiding stop means and the head of the screw abuts against the second external surface and the nut abuts against the external side surface of the guiding stop means, and the stem of the screw extends through the first and second elements to be assembled, a leading thread of the screw mates with a leading thread of the nut,
• wherein the guiding stop means is provided with a centering housing, provided in the external top surface of the guiding stop means, for accommodating the nut.

Fastening arrangement for assembling at least two elements, the fastening device comprising:

• first and second elements to be assembled;
• a screw including a head and a threaded stem, the head being arranged proximate a first external surface of the first one of the elements to be assembled, the first and second elements each having holes formed therein through which the stem of the screw extends;
• a nut including internal threads for engaging with the stem of the screw, the nut being arranged proximate a second external surface of the second one of the elements to be assembled;
• removable guiding stop means, arranged between the first external surface and the head of the screw, for providing, in a first stage, axial prepositioning of the screw and the nut and for permitting, in a second stage, penetration of the threaded stem of the screw into the internal threads of the nut through torquing of the screw and the nut, an axial force exerted on the guiding stop means during torquing of the screw and the nut causing the guiding stop means to clear the screw so that the head of the screw engages with the first external surface of the first one of the elements to be assembled, the guiding stop means including an axial opening, the axial opening being of sufficient size to permit the stem of the screw to extend therethrough and to prevent passage of the head of the screw therethrough, and an external top surface larger than an external periphery of the head of the screw, the guiding stop means having an external side surface, the external side surface being conical in shape;
• the guiding stop means having a length from one end to another, the first and second elements to be assembled have a thickness, and the stem of the screw having a length, the length of the guiding stop means, the thickness of the first and second elements to be assembled, and the length of the screw being such that, when the stem of the screw extends through the guiding stop means and the head of the screw abuts against the external side surface of the guiding stop means, and the stem of the screw extends through the first and second elements to be assembled, a leading thread of the screw mates with a leading thread of the nut;
• and
• the second external surface of the second one of the elements to be assembled being provided with a housing for limiting axial and rotational movement of the nut.

Fastening device for assembling at least two elements, the fastening device comprising:

• first and second elements to be assembled;
• a screw including a head and a threaded stem, the head being arranged proximate a first external surface of the first one of the elements to be assembled, the first and second elements each having holes formed therein through which the stem of the screw extends;
• a nut including internal threads for engaging with the stem of the screw, the nut being arranged proximate a second external surface of the second one of the elements to be assembled;
• removable guiding stop means, arranged between the first external surface and the nut, for providing, in a first stage, axial prepositioning of the screw and the nut and for permitting, in a second stage, penetration of the threaded stem of the screw into the internal threads of the nut through torquing of the screw and the nut, an axial force exerted on the guiding stop means during torquing of the screw and the nut causing the guiding stop means to clear the nut so that the nut engages with the first external surface of the first one of the elements to be assembled, the guiding stop means including an axial opening, the axial opening being of sufficient size to permit the stem of the screw to extend therethrough and to prevent passage of the nut therethrough, and an external top surface larger than an external periphery of the nut, the guiding stop means having an external side surface, the external side surface being conical in shape, the guiding stop means being provided with a centering housing, provided in the external top surface of the guiding stop means for accommodating the nut;
• the guiding stop means having a length from one end to another, the first and second elements to be assembled have a thickness, and the stem of the screw having a length, the length of the guiding stop means, the thickness of the first and second elements to be assembled, and the length of the screw being such that, when the stem of the screw extends through the guiding stop means and the head of the screw abuts against the second external surface and the nut abuts against the external side surface of the guiding stop means, and the stem of the screw extends through the first and second elements to be assembled, a leading thread of the screw mates with a leading thread of the nut;
• and
• the first external surface of the first one of the elements to be assembled being provided with a housing for limiting axial and rotational movement of the screw.

Fastening arrangement, comprising:

• a screw including a head and a threaded stem;
• a nut including internal threads for engaging with the stem of the screw;
• a removable guiding stop including an axial opening, the axial opening being of sufficient size to permit the stem of the screw to extend therethrough and to prevent the head of the screw from passing therethrough, and an external top surface larger than an external periphery of the head of the screw;
• a U-shaped bracket element having first and second legs linked by a bridge, the first and second legs having, respectively, first and second axially aligned holes through which the stem of the screw extends;
• first means, associated with the first leg, for limiting axial movement of the screw relative to the first hole;
• second means, associated with the second leg, for limiting axial and rotational movement of the nut relative to the second hole;
• a male element for being attached between the legs of the bracket element, the male element being of non-circular section and possessing two opposed exterior surfaces, the two opposed surfaces being slidable between the legs of the bracket, the male element further including a third surface;
• and
• the guiding stop providing, in a first stage, axial prepositioning of the screw and the nut, the guiding stop being deformable, during torquing of the screw and the nut, to clear the head of the screw and permit, in a second stage, penetration of the threaded stem of the screw into the internal threads of the nut, engagement between the head of the screw and the first limiting means, and engagement between the nut and the second limiting means, the male element being retained between the legs of the bracket element in the second stage and,
• the guiding stop having a length from one end to another, the bracket element having a thickness, and the stem of the screw having a length, the length of the guiding stop, the thickness of the bracket element, and the length of the screw being such that, when the stem of the screw extends through the guiding stop and the head of the screw abuts against one end of the guiding stop, and the stem of the screw extends through the bracket element, a leading thread of the screw mates with a leading thread of the nut.

A system for fastening a headed screw to a nut, wherein a head of the screw is disposed on an opposite side of a workpiece from the nut and a threaded end of the screw extends through an opening in the workpiece, comprising:

• a workpiece having an first opening extending through the workpiece, the workpiece having a first thickness;
• a nut having an internally threaded second opening, the internally threaded second opening having a first length and a leading end;
• means for positioning the nut relative to the first opening;
• a screw having a threaded end adapted to extend through the first opening and a head that is larger than the first opening, the threaded end being of a second length, the second length being sufficient for the threaded end to extend through the workpiece and engage with the internally threaded second opening of the nut over the entire first length;
• and
• a guiding stop having a first end and a second end and a third opening extending from the first end to the second end through which the threaded end of the screw extends, the third opening being smaller than the head, the guiding stop being of a sufficient length, from the first end to the second end, such that, when the nut is positioned relative to first opening by the positioning means, and the threaded end of the screw is extended through the third opening and the first opening, a leading end of the threaded end of the screw engages correctly with the leading end of the internally threaded second opening of the nut,
• wherein, when a tightening torque is applied to the screw engaged correctly with the leading end of the internally threaded second opening of the nut, the guiding stop yields to permit engagement of the entire first length of the internally threaded second opening of the nut by the screw.

A guiding stop for a fastening arrangement including a screw having a threaded stem and a head and a nut having an opening with internal threads, the guiding stop comprising:

• an external top surface for contact with one of the nut and the head of the screw;
• and
• a body having an axial opening through which the stem of the screw is adapted to extend and through which the contacting one of the nut and the head of the screw is prevented from passing,
• the guiding stop permitting, prior to torquing of the screw and the nut, axial prepositioning of the screw and the nut, the guiding stop, upon application of an axial force to the guiding stop, clearing the screw to permit penetration of the threaded stem of the screw into the internal threads of the nut,
• wherein the guiding stop has a length from one end to another, the length of the guiding stop bearing a relationship to a length of the screw with which it is used such that, when the stem of the screw extends through the guiding stop and the head of the screw abuts against one end of the guiding stop, and the stem of the screw extends through a workpiece to be assembled by the screw and the nut, a leading thread of the screw mates with a leading thread of the nut.

A fastening device, comprising:

• a screw having a threaded stem and a head;
• a nut having an opening with internal threads;
• and
• a guiding stop, the guiding stop including an external top surface for contact with one of the nut and the head of the screw, and a body having an axial opening through which the stem of the screw is adapted to extend and through which the contacting one of the nut and the head of the screw is prevented from passing,
• the guiding stop permitting, prior to torquing of the screw and the nut, axial prepositioning of the screw and the nut, the guiding stop, upon application of an axial force to the guiding stop, clearing the screw to permit penetration of the threaded stem of the screw into the internal threads of the nut,
• wherein the guiding stop has a length from one end to another, and the screw has a length, the length of the guiding stop bearing a relationship to the length of the screw with which it is used such that, when the stem of the screw extends through the guiding stop and the head of the screw abuts against one end of the guiding stop, and the stem of the screw extends through a workpiece to be assembled by the screw and the nut, a leading thread of the screw mates with a leading thread of the nut.