Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Metallic resilient securing means
Reexamination Certificate
2000-05-24
2001-10-30
Wilson, Neill (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Metallic resilient securing means
C411S533000, C411S546000
Reexamination Certificate
active
06309157
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates in particular to screws provided with sleeves.
In machine construction, screws in the course of a high pre-manufacturing process are inserted through sleeves and then the manufacture is finished. For this purpose it is especially important that the sleeve is non-removably connected with the screw. In order to nonremovably connect the screw with the sleeve, the screw is provided on its shaft with a peripheral radially outwardly extending bead. Furthermore, the sleeve in accordance with the prior art is provided inside with a narrow point, so that the sleeve because of its narrow point and the peripheral bead of the screw can not be stripped from the screw. This solution however has the disadvantage that the utilized screws are not standard screws, but instead are specially manufactured screws with a concomitant high cost. Moreover, in the region of the peripheral bead there is a notch action, so that the screw at the point of the bead has a weak point.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide screws with non-releasable sleeves, which however are not formed as special screws.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated in a screw with a sleeve in which a screw shaft has a smaller diameter than an outer diameter of a threaded region and the sleeve has on an inner side a narrow point with a diameter smaller than the outer diameter of the threaded region of the screw so that the sleeve is non releasably arranged on the screw.
With the use of standard screws with a smaller size diameter than the outer diameter of the threaded portion, the screw obtains a transition from the shaft to the thread formed as a thickening which constitutes an abutment for the narrow location of the sleeve. With the use of standard screws, the release protection of the sleeve is obtained in less costly manner than before, since it is no longer necessary to use specially manufactured screws.
In order to provide a simple manufacture, the narrow location can be formed by at least one radially inwardly extending and outwardly embossed projection.
In accordance with another feature of the present invention it is favorable for manufacture when the projection is formed as a peripheral, continuous bead. At least one projection can be also formed by inwardly projecting edges of a piercing of the sleeve casing. These inwardly projecting edges have spring-elastic properties so that the edges make possible pushing of the screw through the sleeve. A sliding-out from the screw is however impossible since the inwardly projecting edges act as a barb.
For eliminating the embossing process of the sleeve, also openings can be formed in the sleeve casing. The projections of a spring element can snap into the openings from outside to form the narrow location.
It is advantageous for the manufacture when the narrow location is formed by a ring element which abuts against an abutment on the inner side of the sleeve.
A washer disk which is connected with the sleeve and non rotatably held in the screw can also form the narrow location. Therefore the washer disk performs on the one hand a function of securing the screw from an undesirable release, and furthermore, when the inner diameter of the washer disk is smaller than the thread outer diameter, it prevents stripping of the sleeve from the screw. With this solution, conventional screws can be used with non-releasable washer disks, and the sleeve can be for example welded, soldered or glued on the washer disk.
The sleeve and/or the washer disk can be slotted. Thereby the sleeve and/or the washer disk during passing of the narrow location formed by the washer disk is expanded over the screw thread and when the narrow point is completely displaced over the screw thread it is snapped back again.
In view of a cost-favorable manufacture in great numbers, the sleeve can be wound from a sheet metal punched blank. However, it is possible to produce it by deep drawing or turning. Longer sleeves however can be produced easier by winding than by deep drawing.
Based on calculations of the manufacturing cost and required strength, the sleeve can be composed for example of metal, synthetic plastic or rubber.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 3221794 (1965-12-01), Acres
patent: 4892000 (1990-01-01), Renk et al.
patent: 5244325 (1993-09-01), Knohl
patent: 5336028 (1994-08-01), Yamamoto
patent: 5807052 (1998-09-01), Van Boven et al.
patent: 6044536 (2000-04-01), Schneider
Amann Erich
Baron Ralf
Elring Klinger AG
Striker Michael J.
Wilson Neill
LandOfFree
Screw with sleeve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screw with sleeve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screw with sleeve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2616863