摘要:
A self-plugging blind rivet (10), of the kind comprising a tubular body (14) having a head (32) and a shank (30) which is deformed by means of a headed stem (12) which is disposed in the body (14) and pulled so as to form a blind head (60) and, if necessary, to cause the shank to bulb so as to grip workpieces of lesser thickness than the maximum for which the rivet is designed, is so shaped and dimensioned as to avoid the need for a crimping or hardening operation to be performed on the shank (30). Thus the shank (30) is made of uniform hardness, and has a waist (42) and a tail portion (40), the waist (42) being of reduced external diameter compared with the tail portion (40), and the tail portion (40) having a length B and an external diameter D which are related to satisfy the expression B=mD+n wherein B is the length, in millimetres, of the tail portion (40); D is the external diameter, in millimetres, of the tail portion (40); n is a length, in millimetres, of from 2.15 to 2.73 millimetres, and m is a number from 0.373 to 0.527 inclusive.
摘要:
Repetition pull-through blind riveting apparatus (10), of the type comprising a reusable and reloadable mandrel with an enlarged head which is pulled through each tubular rivet in turn to install the rivet is provided with a safety device (141) for counting the total number of times the mandrel has been pulled. The apparatus includes pneumatically-operated mandrel pulling means, and a counter (132) counts the number of times the pressure of the air powering the pulling device reaches a pressure slightly below that required to pull the mandrel head through a rivet. The counter (132) is arranged to actuate, when a safe limit number of pulls has been counted, both a shut-off valve (137) to shut-off the supply of pressure air to the mandrel pulling means, and a visual indicator (135). The visual Indicator (135) may be actuated at a warning count number rather lower than the safe limit number. The counter (132) can be reset to zero only by use of a separate key (142), when a new mandrel is installed in the rivet placing apparatus.
摘要:
Repetition pull-through blind riveting apparatus (10), of the type comprising a reusable and reloadable mandrel with an enlarged head which is pulled through each tubular rivet in turn to install the rivet is provided with a safety device (141) for counting the total number of times the mandrel has been pulled. The apparatus includes pneumatically-operated mandrel pulling means, and a counter (132) counts the number of times the pressure of the air powering the pulling device reaches a pressure slightly below that required to pull the mandrel head through a rivet. The counter (132) is arranged to actuate, when a safe limit number of pulls has been counted, both a shut-off valve (137) to shut-off the supply of pressure air to the mandrel pulling means, and a visual indicator (135). The visual Indicator (135) may be actuated at a warning count number rather lower than the safe limit number. The counter (132) can be reset to zero only by use of a separate key (142), when a new mandrel is installed in the rivet placing apparatus.
摘要:
For use in a robotically operated workstation , apparatus for installing fasteners, for example tubular blind rivets, comprises a pneumatically operated fastener installation tool (16). The tool 16 has a part in the form of a headed mandrel (22) which is loaded with and carries a finite supply of the fasteners, a gripping and pulling actuator (26) and a nose assembly (21) which provides an abutmentl (18) for supporting successive rivets while the mandrel is pulled to draw its head through and set the rivet. For reloading the tool with further fasteners, after use, the apparatus includes a nest (96 b ) for detaching and receiving the mandrel (22), together with the nose assembly (21), from the actuator (26), and a similar nest (96 a ) provided with another nose assembly and another mandrel fully loaded with fasteners which it presents and attaches to the actuator (26). An indexing table (110) interchanges the nests (96 a ) and (96 b ) between a station for reception and presentation of mandrels with nose assemblies, and a reloading station at which further fasteners are loaded on to a mandrel by feeding and transfer means (150). An alternative or supplementary reloading system includes a nest (90) for reception of a used mandrel and nose assembly from the tool (16), and at least one other nest (91) containing another nose assembly and a mandrel carrying a full load of fasteners for presentation to a tool actuator from which the mandrel and nose assembly have been removed.
摘要:
Apparatus for the pull-through blind installation of a headless tubular ferrule (12) in a hole (13) in a workpiece (14) at a position therealong spaced from the nearer face (22) of the workpiece (14), comprises an annular anvil (34) for supporting the ferrule inside the workpiece hole (13); anvil supporting means for initially supporting the anvil (34) at a position inside the workpiece hole (13); a mandrel having a stem (31) extending through the anvil aperture, and an enlarged head (36); pneumattically-operated retraction means for retracting the mandrel stem (31) through the anvil aperture thereby to draw the mandrel head (36) into the adjacent part of the bore (39) of the ferrule whilst the ferrule (12) is supported inside the workpiece hole (13) by the annular anvil (34), thereby to enlarge the part of the ferrule (12) more remote from the anvil into engagement with the workpiece (14); and pneumatically-operated withdrawal means for withdrawing the anvil away from the ferrule (12) to allow the mandrel head (36) to be withdrawn completely through the remainder of the bore of the ferrule (12), to complete installation of the ferrule (12).
摘要:
Fastener installation apparatus, for installing fasteners such as blind rivets of the type which includes a washer-like member (13) which is free to fall away from the installed fastener, is provided with temporary retaining means (42, 42) for temporarily retaining the washer-like member (13) on the installation apparatus after installation of the fastener. The temporary retaining means comprises a pair of gripping faces (42, 42) which project forwardly from the reaction faces (25, 25) of a pair of members (40 or 48) which are part of the nosepiece of the apparatus. The gripping faces (42, 42) close together automatically to grip the washer-like (13) member as the installation apparatus installs a fastener, and draw apart again to release the washer-like member (13) as the installation apparatus returns to be ready to receive a further fastener for installation.
摘要:
For use in a robotically operated workstation , apparatus for installing fasteners, for example tubular blind rivets, comprises a pneumatically operated fastener installation tool (16). The tool 16 has a part in the form of a headed mandrel (22) which is loaded with and carries a finite supply of the fasteners, a gripping and pulling actuator (26) and a nose assembly (21) which provides an abutmentl (18) for supporting successive rivets while the mandrel is pulled to draw its head through and set the rivet. For reloading the tool with further fasteners, after use, the apparatus includes a nest (96 b ) for detaching and receiving the mandrel (22), together with the nose assembly (21), from the actuator (26), and a similar nest (96 a ) provided with another nose assembly and another mandrel fully loaded with fasteners which it presents and attaches to the actuator (26). An indexing table (110) interchanges the nests (96 a ) and (96 b ) between a station for reception and presentation of mandrels with nose assemblies, and a reloading station at which further fasteners are loaded on to a mandrel by feeding and transfer means (150). An alternative or supplementary reloading system includes a nest (90) for reception of a used mandrel and nose assembly from the tool (16), and at least one other nest (91) containing another nose assembly and a mandrel carrying a full load of fasteners for presentation to a tool actuator from which the mandrel and nose assembly have been removed.