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US 6,224,310 B1Granted
Blind rivet and method of making same
AssigneeEmhart Inc.
InventorsFrederick Arthur Summerlin, Harvey Philip Jeal
Life of this patent
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AssigneeEmhart Inc.
InventorsFrederick Arthur Summerlin, Harvey Philip Jeal
Estimating the term…
A self-plugging blind rivet for securing together apertured members comprises a tubular shell (11) having a tail end fact (16) at one end, a pre-formed radially enlarged head (13) at the other end, and a stem which extends through the shell and has a stem head (22) adjacent the tail end fact (16) of the shell. The region adjacent the stem head (22) is of increased diameter relative to the rest of the stem shank and has a plurality of axial depressions (26) formed therein, the corresponding region of the shell being arranged to fill the axial depressions (16) in the stem and being harder than the material of the shell (11) in a region adjacent the radially enlarged head (13). In use and under axial compression leading of the shell (11), the shell (11) buckles in the region adjacent the member remote from the performed head to form a blind head in contact with said member so as to clamp together the apertured members.
A self-plugging blind rivet for securing together apertured members, the rivet comprising a tubular shell (11) having a tail end face (16) at one end and a pre-formed radially enlarged head (13) at the other end, and a stem which extends through the shell and has a stem head (22) adjacent the tail end face (16) of the shell (11), in which the region adjacent the stem head is of increased diameter relative to the rest of the stem shank and has a plurality of axial depressions (26) formed therein, the corresponding region of the shell being arranged to fill the axial depressions (26) in the stem and being harder than the material of the shell (11) in a region adjacent the radially enlarged head (13), whereby, in use and under axial compression loading of the shell, the shell (11) buckles in the region adjacent the member remote from the preformed head to form a blind head in contact with said member so as to clamp together the apertured members.
A me-hod of assembling a rivet comprising a tubular rivet shell (11) having a pre-formed radially enlarged head (13) at one end, and a stem comprising a head (22) and a shank (25) having a region of increased diameter formed with a plurality of axial depressions (26, adjacent the head (22), the method comprising inserting the shell (11) in a die (40) having a bore, a first part (41) of which closely fits the outside diameter of the shell (11), the tail end (16) of the shell (11) protruding into a second part (42) of the bore (40) having a larger diameter, supporting the head (13) of the shell (11) with an abutment (43, inserting a punch (45) which has a first diameter (46) closely fitting the bore (12) of the rivet shell (11), a second diameter (47) equal to the increased diameter under the head (22) of the stem and a third diameter (48) equal to the larger bore (42) of the die (40), applying a compressive force between the punch (45) and the abutment (43) so as to open the bore of the tail end (16) of the shell (11) to be equal to the increased diameter under the head (22) of the stem, and compressing the tail end (16) of the shell (11) so as to increase its wall thickness, removing the abutment (43) and punch (45), inserting a stem (21) and ejecting the assembled stem and shell from the die.
A self-plugging blind rivet securing together apertured members, the rivet comprising a tubular shell (11) having a tail end face (16) at one end and a pre-formed radially enlarged head (13) at the other end, and a stem (28) which extends through the shell (11) and has a stem head (22) adjacent the tail end face (16) of the shell (11), in which the region adjacent the stem head (22) is of increased diameter relative to the rest of the stem shank (28) and has a plurality of axial depressions (16) formed therein, the stem shank (25) in the area of the axial depressions (26) being formed of a material comparatively harder than the material forming the shell (11) which is joined to the stem shank at the axial depressions (26) upon material of the shell (11) being forced under compression to flow into the axial depressions (26) of the stem shank (25).
Dependencies are inferred from the claim text.