Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1993-01-08
1994-11-08
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 60, 411324, F16B 1304
Patent
active
053621859
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a device used for positioning components, like those of the die or mold plates employed in shaping machinery, capable of being inserted in matching bores in or through the components, and comprising a cylindrical jacket around an axial bore and provided with a continuous slot.
In many applications it is necessary to position two components together. This is especially true of the die or mold plates employed in shaping machinery for precision blank cutting, punching, or compression molding. Such a plate can be composed of several components, each of which dictates part of the shape. It will be obvious that such components must be positioned together very precisely.
Positioning can be essentially either permanent or temporary. In the former the components remain together and in the second they are taken apart again after a while.
The devices employed for positioning such components up to now have been cylindrical or conical bolts and tension and expansion bolts of the type specified with reference to the drawing.
It should in particular be possible to remove and reuse the positioning devices employed with take-apart components. The devices must in this event be protected from the sort of damage that results from accidental fusion when a device is forced into a matching bore. The bores in the components must of course also be protected from the damage that occurs when the outside diameter of the device is longer than the inside diameter of the bore.
SUMMARY OF THE INVENTION
The object of the present invention is to improve a device of the aforesaid type to the extent that it will allow greater tolerance between its outside diameter and the inside diameter of the bores and the distances between them such that neither the device itself nor the bores will be damaged and whereby the device can be extracted from the bore without damaging the latter.
This object is attained in accordance with the invention with a resilient rod in the axial bore that can be subjected to force from one or both ends.
The force, especially from both ends, will vary the diameter of the rod and apply force to the cylindrical jacket, causing it to expand within the bore for example into frictional or interlocking engagement with the inner surface of the bore.
The force can be applied by closing off one end of the device and screwing a compression screw in from the other end. Thus, at least one compression screw will be accessible from outside even in a blind bore, and it can be screwed into the axial bore with an inside-hexagonal wrench once the device has been inserted into the bore, applying force to the resilient rod and expanding the cylindrical jacket.
A device of this type is also very easy to disengage just by eliminating the force on the rod to allow the device to return to its original shape, after which it will drop out of the bore.
A device of this type will preferably be made of a hard material, although other materials are also conceivable because the frictional or interlocking engagement does not occur until the device is in the bore and there will accordingly be no accidental fusion between the materials.
Whether the components are o a soft or a hard material makes no difference.
It should be emphasized in particular that this device has all the advantages of the previously known very expensive expanding bolt while being particularly cost-effective to manufacture. The device can be inserted manually and secured with an ordinary tool, an inside-hexagonal wrench for example. Its application is universal. The tolerances such a device allows are extraordinarily liberal.
The cylindrical jacket in one preferred embodiment of the invention has a bezel at the edge that merges into a flat face. The bezel and flat face particularly facilitate inserting the device into a matching bore. The bezel slants down from the edge of the bore, narrowing the aforesaid slot and allowing a device with a considerable diameter to be inserted into a matching bore with a prescribed inside diameter
REFERENCES:
patent: 1220024 (1917-03-01), Tanzi
patent: 3042094 (1962-07-01), Liljeberg
patent: 5244323 (1993-09-01), Tucchio
Connex AG
Fogiel Max
Lindsey Rodney M.
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