Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Securing means pivotable about axis transverse to fastener...
Reexamination Certificate
1999-09-15
2001-03-20
Saether, Flemming (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Securing means pivotable about axis transverse to fastener...
C411S535000, C411S546000
Reexamination Certificate
active
06203260
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention pertains to an improved toggle bolt assembly. More particularly, this invention relates to a bolt centering spacer used with a toggle bolt type assembly which provides a snug fit between the toggle bolt exterior and a wall aperture perimeter.
Toggle bolts generally consist of a threaded bolt and a toggle which can be threaded onto the bolt. The toggle has a pair of wings which are urged open by a spring. In their collapsed position, the wings fit closely about the periphery of the bolt so that the toggle and bolt shaft can be inserted through a hole in a wall.
In connecting an object to the wall or the like by a toggle bolt, a hole is first drilled into the wall. The hole must have a diameter which is sufficient to allow the collapsed toggle with its wings in a closed position to pass through the hole. Next, the object to be secured to the wall is positioned about the bolt shaft and the toggle is threaded to the end of the bolt. The toggle wings are then collapsed and the toggle is passed through the hole by pushing the bolt shaft. After the toggle wings are completely through the wall the toggle springs open. Next, the toggle is pulled back into engagement with the wall such that the toggle wings bridge the hole in the wall. Holding the toggle wings against the wall surface so that the toggle does not rotate, the bolt is then rotated with respect to the toggle until the head of the bolt engages the object and the object is secured against the wall.
While toggle bolts have been used advantageously in the past, several problems have been present. One problem is that the hole drilled for insertion of the bolt must be larger than the diameter of the bolt in order for the toggle to pass through the hole. Since this hole is larger than the shaft of the bolt, the bolt shaft is free to shift inside the hole. This is undesirable and can cause mechanical working of the bolt against the wall material possibly resulting in a failure of the wall material or the bolt.
Another problem caused by the bolt shaft being smaller than the hole it passes through is that the toggle wings may unsymmetrically bridge the hole. If the bolt shaft is not centered in the hole one wing of the toggle may encounter more wall surface than the other wing. The portion of the wall supporting the smaller part of the toggle is likely to fail which in turn causes the remaining portion of the wall beneath the toggle to fail.
Although devices have been used in conjunction with toggle bolt assemblies in an attempt to overcome the above discussed problems, other problems are created by the use of such devices. One such problem is caused when these devices are used with varying wall thicknesses because the toggle device is prevented from engaging the wall.
Accordingly, it has been considered desirable to develop a new and improved toggle bolt assembly which would overcome the foregoing difficulties and others while providing better and more advantageous overall results.
BRIEF SUMMARY OF THE INVENTION
This invention pertains to an improved toggle bolt assembly. More particularly, this invention relates to a bolt centering spacer used with a toggle bolt assembly which provides a snug fit between a toggle bolt exterior and a wall aperture perimeter.
The toggle bolt assembly is used with a hole or an opening in an associated wall or support surface. The toggle bolt assembly is used to attach or secure an object to the supporting surface. The toggle bolt assembly comprises a bolt of a specified diameter including a threaded diameter, a shank, and a head. The toggle bolt assembly also comprises a toggle member having a threaded receiving aperture and a pair of wings pivotally mounted on opposite sides of the aperture. The wings extend from the threaded receiving aperture for securing the toggle member to the associated supporting surface. The toggle member threadedly engages the bolt via the receiving aperture.
The toggle bolt assembly further comprises a bolt centering spacer comprising a generally cylindrical body having a first end, a second end, a longitudinal axis, and an outside diameter substantially the same as a diameter of the opening in the associated supporting surface. The bolt centering spacer also includes an opening extending between the first and second ends of the cylindrical body having a diameter substantially the same as the threaded diameter of the bolt for receiving and centering the bolt. The bolt centering spacer further includes a flange extending radially outwardly from the first end of the cylindrical body. The flange positions the bolt centering spacer along a longitudinal axis of a hole in an associated supporting surface. The flange of the bolt centering spacer can include a diameter that is larger than a diameter of a hole on an associated supporting surface to prevent the bolt centering spacer from sliding completely through the hole of the associated supporting surface.
The bolt centering spacer also comprises at least one continuous groove circumferentially extending around an outside perimeter of the cylindrical body. The continuous groove includes a diameter that is smaller than the diameter of the cylindrical body. The bolt centering spacer can include a plurality of continuous grooves extending around the outside perimeter of the cylindrical body spaced along the longitudinal axis of the cylindrical body at predetermined positions for facilitating easy cutting of the bolt centering spacer to a corresponding width of the associated supporting surface.
The wings of the toggle member are selectively moveable between a spanned, open, position and a collapsed, closed, position. The toggle member can include a spring for holding the wings in the spanned, open, position after the toggle has been inserted into the hole of the associated supporting surface.
When the wings are in the collapsed closed position, the outside diameter of the toggle member is substantially the same as the outside diameter of the cylindrical body of the bolt centering spacer.
One advantage of the present invention is the provision of a new and improved toggle bolt assembly.
Another advantage of the present invention is the provision of a toggle bolt assembly which includes a bolt centering spacer that provides a snug fit for the bolt in a wall to firmly anchor heavy objects to the wall without distorting the wall material or causing wall failure.
Still another advantage of the present invention is the provision of a toggle bolt assembly which includes a bolt centering spacer capable of being utilized with varying wall thicknesses.
Yet another advantage of the present invention is the provision of a bolt centering spacer which produces a dimensionally stable toggle bolt assembly by positioning the toggle bolt shaft securely in the center of the wall hole thus preventing the toggle bolt shaft from moving to the edges of the large wall hole and away from the desired position.
Yet still another advantage of the present invention is the provision of a bolt centering spacer including a plurality of grooves for reducing the length of the bolt centering spacer such that its length equals the thickness of the wall the toggle bolt assembly is used upon.
Still other benefits and advantages of the invention will become apparent to those skilled in the art upon a reading and understanding of the following detailed specification.
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patent: 4997327 (1991-03-01), Cira
patent: 5207524 (1993-05-01), Arnold
patent: 5209621 (1993-05-01), Burbidge
patent: 5702218 (1997-12-01), Onofrio
Fasteners for Retail1997 Buyers Guide.
Henline Carl B.
Henline Charles
Fay Sharpe Fagan Minnich & McKee LLP
Saether Flemming
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