Metal working – Means to assemble or disassemble – Overedge assembling means
Reexamination Certificate
2001-01-03
2002-06-18
Hail, III, Joseph J. (Department: 3723)
Metal working
Means to assemble or disassemble
Overedge assembling means
C029S812500, C029S243540, C072S391400
Reexamination Certificate
active
06405421
ABSTRACT:
BACKGROUND
1. Field of the Invention
The present invention relates to a die assembly for riveting, and particularly to a die assembly which can firmly and automatically rivet.
2. Related Art
FIG. 6
shows a conventional die assembly
10
for riveting which requires manual operation. The die assembly
10
includes an upper die
101
, and a base die
105
. A fixing block
102
is mounted to the upper die
101
, corresponding to a sizing block
103
which is mounted to the base die
105
. A pair of clamps
106
is positioned at opposite sides of the sizing block
103
. A workpiece (not shown) is placed onto the sizing block
103
. When power is turned on, the upper die
101
moves downwardly, and the fixing block
102
forces the workpiece against the sizing block
103
. Then the clamps
106
rivet the workpiece. The clamps
106
are then pulled away from the workpiece, and the workpiece is unloaded from the die assembly
10
.
Placing, riveting, and unloading the workpiece are all required to be done manually. Riveting requires an operator to use both hands. The procedure is labor-intensive and unduly inefficient, which results in high manufacturing costs. Moreover, manual riveting limits the amount of pressing force which can be applied. Rivets are too often not firmly secured.
Therefore an improved die assembly for riveting is desired to overcome the above-mentioned shortcomings of the related art.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a die assembly for riveting which has a high level of automation.
Another object of the present invention is to provide a die assembly which can firmly rivet workpieces together.
To achieve the above-mentioned objects, a die assembly for riveting comprises an upper die, a base die, a pair of clamps, and a pair of springs. The upper die comprises a fixing block, and a pair of pressing protrusions at opposite sides of the fixing block. A first slanted surface is formed at an end of each pressing protrusion. The base die comprises a sizing block to position a workpiece. Two supporting blocks are formed at opposite sides of the sizing block, each defining a through hole for accommodating the clamp. Two positioning blocks are formed at opposite sides of the supporting blocks. Each clamp comprises an end block having a second slanted surface corresponding to the first slanted surface of the pressing protrusion, and a connecting portion slidable in the through hole of the supporting block. The springs connect the clamps to the positioning blocks.
Other objects, advantages and novel features of the present invention will be drawn from the following detailed embodiments of the present invention with attached drawings, in which:
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patent: 5277049 (1994-01-01), Endo
patent: 5279024 (1994-01-01), Zieve
patent: 6041493 (2000-03-01), Donhauser
patent: 6266871 (2001-07-01), Edwards
patent: 6276050 (2001-08-01), Mauer
Chung Wei Te
Hail III Joseph J.
Hon Hai PrecisionInd. Co., Ltd.
Shanley Daniel
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