Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J15/00—Riveting
  • B21J15/02—Riveting procedures
  • B21J15/04—Riveting hollow rivets mechanically
  • B21J15/048—Setting self-drilling hollow rivets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J15/00—Riveting
  • B21J15/02—Riveting procedures
  • B21J15/04—Riveting hollow rivets mechanically
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J15/00—Riveting
  • B21J15/02—Riveting procedures
  • B21J15/04—Riveting hollow rivets mechanically
  • B21J15/043—Riveting hollow rivets mechanically by pulling a mandrel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J15/00—Riveting
  • B21J15/10—Riveting machines
  • B21J15/105—Portable riveters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J15/00—Riveting
  • B21J15/10—Riveting machines
  • B21J15/16—Drives for riveting machines; Transmission means therefor
  • B21J15/26—Drives for riveting machines; Transmission means therefor operated by rotary drive, e.g. by electric motor

Definitions

• This invention relates to power operated self-drilling rivet setting tools that drill and set 'pop' type and 'blind' rivets having a mandrel that pulls through a rivet body to upset said rivet body in a workpiece.
• a feature of these tools is the provision of a mechanism requiring a reversing action
• the novel tool of this invention is a light-weight power operated self-drilling rivet setting tool that has a minimum operating parts.
• the housing is adapted to be held by the operator.
• a further object of this invention is the provision of a resiliently bias'd ON/OFF trigger-switch to control all the functions of the tools drilling and rivet setting cycle, making it quick and user friendly.
• Yet another object of this invention is to provide "an end of cycle" positioning means for inserting and release of a mandrel shank. This is achieved by providing a spring-loaded locking-ball interfacially situated between the tools jaws-piston and housing; the locking-ball seating in a recessed dimple in the tools jaws-piston when the tool is in the jaws open position, thus preventing over-run after releasing the trigger-switch, as torque is now translated into the rotary component.
• a further object of this invention is to provide a means to prevent premature collapsing of the rivet body due to drill-bite, or too much pressure on the trigger before drilling of the workpiece is completed. This is achieved principally by providing a drive- pinion and gear wheel ratio that "ensures that the maximum drive-power needed to complete the drilling operation is less than the minimum drive-power needed to collapse the rivet"; to prevent accidental collapse of a rivet, a spring-loaded locking-ball is provided interfacially situated between the tools jaws-piston and its housing; the locking-ball seating in a recessed slot means in the tools jaws-piston and extending from an "end of cycle” position to a point at which the jaws are satisfactorily tightened upon the mandrel shank. At this point pressure on the spring-loaded locking-ball prevents unwanted torque-conversion during the drilling operation so preventing premature collapsing of the rivet body.
• a further object of this invention is to provide a self-drilling mandrel that prevents splaying of a rivet body prior to insertion in a workpiece. This is achieved by providing a tapered portion to the mandrel shank before and into a concave recessed shoulder means at the junction of the mandrel shank and self-drilling head. This allows a suitable rivet body to squeeze in rather than splay out at the rivets interface with the mandrels shoulder part when initial tension is applied to the mandrel shank.
• the tapered portion of the mandrel shank also doubles as a "break-point" allowing the drill-point head to fall clear preventing corrosion problems associated with the "blind" type rivets after setting has taken place.
• Figure 1 is a cross-sectional view of the power operated drilling and rivet setting tool and mandrel of this invention.
• Figure 2. is a cross-sectional view of the tools rotary cylinder part at 90° to that shown in Figure 1.
• Figure 3 is a cross-sectional view of the brake-band assembly.
• Figure 4. shows a plan view of the brake-band control-bar system.
• Figure 1 illustrates the power operated self-drilling rivet setting tool of this invention as having a one piece housing 35 containing the drive unit 27, the cam operated mandrel drawing mechanism 4 to 16, the latter enclosed within a rotatable cylinder 44 which facilitates the drilling operation of the tool.
• the housing 35 is
• a mandrel shank 40 of a self-drilling rivet is inserted fully into the respective size nozzle 1, as is well known in the Art.
• the resiliently bias'd 31 trigger-switch 32 is pulled to activate the ON/OFF switch 28 starting the drive motor 27 driving the principal drive-pinion 24 of the tool; this drive-pinion 24 is extended into a housed bearing centrally situated at one end of a rotary cylinder 44 having also a bearing supporting the other end; this allows the drive-pinion and rotary cylinder to rotate independently of each other.
• a light pull on the trigger-switch 32 will engage the braking system 19, 20, 22, 23, 30 & 32; whereas, when the trigger-switch 32 is pulled the stirrup-rod 20 rides up the divergence of the brake-band by a canting means of the brake-band holding blocks 19 and an arc scribed by the end bearing 29 of the stirrup-rod 20. This action tightens the brake ⁇ band 22 around the slipper-ring 23 thereby braking the rotary cylinder 44 and transferring torque to the rivet setting mechanism. This method is used to create less pressure on the bearing parts.
• This light braking action of the rotary cylinder may be used to release the "end of cycle" spring-loaded locking-ball 9 from its seat 11 in the jaws-piston 14 as it pulls through its housing 7; this action withdraws the jaws 5 from the spreader-ring 3 at the threaded end 2 of the nozzle 1 and conal pressure from the jaws-piston 14 on jaws 5 engages jaws-teeth 41 upon the mandrel shank 40, as is well known in the Art.
• the jaws-teeth 41 are angled to facilitate grip on the mandrel shank during the drilling operation and such that the teeth cause an inward pull on the mandrel shank.
• a spring-loaded locking-ball 9 is inter-facially situated between the jaws-piston 14 and housing 7, with a slot means 10 from the "end of cycle" position to a point before collapsing of a rivet would occur and the natural torque- conversion point dictated by the ratio of the drive-pinion 24 and gear wheel 25; at which point considerably more pressure would have to be applied to the trigger-switch 32 or excessive drill-bite to collapse a rivet prematurely.
• Maintaining pressure on the trigger-switch 32 will return the cam 16 to its foremost position, during which time the tool may be withdrawn from the workpiece.
• the trigger-switch 32 may.be released as the "end of cycle” locking-ball clicks into its seating dimple 11 in the jaws-piston 14 ending the cycle.
• An ON/OFF adjustment screw 34 is provided.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Insertion Pins And Rivets (AREA)
• Drilling And Boring (AREA)
• Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
• Percussive Tools And Related Accessories (AREA)

Applications Claiming Priority (9)

Publications (1)

Family

ID=27423165

Family Applications (1)

Country Status (8)

Families Citing this family (25)

Family Cites Families (3)

• 1995
  • 1995-12-20 AU AU40559/95A patent/AU4055995A/en not_active Abandoned
• 1996
  • 1996-02-13 EP EP96902348A patent/EP0812243A1/de not_active Withdrawn
  • 1996-02-13 WO PCT/GB1996/000308 patent/WO1996025258A1/en not_active Ceased
  • 1996-02-13 KR KR1019970705658A patent/KR19980702261A/ko not_active Withdrawn
  • 1996-02-13 CN CN96191986A patent/CN1175916A/zh active Pending
  • 1996-02-13 JP JP8524747A patent/JPH11505474A/ja active Pending
  • 1996-02-13 CA CA002213217A patent/CA2213217A1/en not_active Abandoned
  • 1996-05-01 TW TW085102755A patent/TW346423B/zh active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events