JPH071070A - Rivet setting tool - Google Patents

Abstract

PURPOSE: To shorten the time for rivet setting and to improve productivity. CONSTITUTION: A rivet setting tool 10 has a setting head 12 which accepts and sets rivets and discharges the rivet into a collecting box 16 via a collecting tub 14 by releasing a used mandrel. An operator sets the operation time for setting the rivet at a timer 34 by experience, etc. A controller 32 supplies electric power to a three-way valve 28 by the operator's operation of a starter 30, thereby moving the valve to an operation position. The controller cooperatively starts the electric timer 34. The air controlled by the three-way valve 28 is supplied to a fluid booster 22 which in turn actuates the head 12. The timer allows the setting of the time within the prescribed time and the supply of the driving power to the three-way valve 28 is stopped by the actuation of the timer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to blind rivet setting tools.

[0002]

BACKGROUND OF THE INVENTION Blind rivets have a tubular rivet body in which a mandrel having a head portion is attached to the narrow end of a stem for retracting the mandrel into the rivet. And expand the rivet. This occurs when the pullback force reaches a predetermined force, i.e. the predetermined force which is controlled by the tool operator by pulling the trigger until this force occurs. Thus, the productivity of the tool is related to the skill of the operator knowing when the rivet will be set so that the tool can be reset to accept the next rivet.

This period of exhaustion is required to deliver the next rivet to the tool, because the tool must be exhausted (the mandrel must be released) before the pneumatic tool can be reactivated. Productivity also decreases for longer than is done.

[0004]

SUMMARY OF THE INVENTION The present invention thus improves rivet setting tool productivity by minimizing rivet setting time and also minimizing tool exhaustion time.

[0005] The means and operation of the present invention will be made clearer by the following description, which describes the preferred embodiments of the present invention.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A rivet setting tool 10 of the present invention includes a rivet setting head 12. The head 12 receives a rivet (not shown), sets the rivet, releases the used mandrel, and discharges the mandrel into the accumulating box 16 through the mandrel accumulating tube 14. The rivet setting head has a fluid manipulating portion 18 to which pressurized fluid is supplied from a pneumatically actuated fluid augmentation device 22 via a suitable conduit 20. Details of previous rivet setting tools are disclosed in US Pat. No. 3,254,522. High-pressure air is supplied from the air supply source 24 to the fluid intensifying device 22 via the air controller 26 and the three-way quick discharge valve 28. When operating the rivet setting tool 10, the operator activates the device by pressing an appropriate button or activator 30. Controller 32 supplies power to three-way valve 28 to move valve 28 to the actuated position. This controller 32 also has an electrical timer 34.
Are linked to start. The timer 34 operates for a predetermined time. The electrically operated three-way air valve 28 supplies air controlled thereby to the fluid augmentation device 22 to operate the rivet setting head 12. When the timer 34 is stopped, the power supply to the solenoid 28 is stopped and the three-way valve 28 is in the open position, so that the air inside the fluid intensifying device 22 is discharged. The timer 34 has a dial and can set the time within a predetermined time.

During operation, the operator determines the operating time of the rivet setting tool for setting the rivet by experience and sets the time in the timer. Thus, the operating time of this tool is independent of the time the button is pressed, and the operator only has to press the button to operate the tool for the desired time. This time is also by using an acceleration sensor 40 that senses the impact of a broken mandrel, or by using a fluid pressure sensor 42 that senses a rapid loss of fluid pressure due to the breaking of the mandrel. It can also be determined by using a fluid piston displacement sensor 44 which monitors the linear displacement of the fluid piston of the rivet setting head where a predetermined amount of rivet mandrel breakage is obtained as the piston moves. The fluid pressure sensor 42 and the fluid piston bias sensor 44 allow the operator to vary the precise time determination that is indicative of mandrel failure.

[Brief description of drawings]

FIG. 1 shows a block diagram of a rivet setting tool constructed in accordance with the present invention.

[Explanation of reference numerals] 10: rivet setting tool, 12: rivet setting head, 14: mandrel collecting tube, 16:
Accumulation box, 18: fluid operation part, 20: conduit, 22: fluid intensifier, 24: air supply source, 26: air controller, 28:
Three-way quick discharge valve, 30: button, 32: controller, 3
4: timer, 40: acceleration sensor, 42: fluid pressure sensor, 44: fluid piston deviation sensor.

Claims (6)

[Claims] 1. A rivet setting tool for setting a rivet by breaking a rivet mandrel comprising a fluid operated rivet setting tool and means for supplying high pressure fluid to the rivet setting tool. The means for supplying high pressure fluid comprises: an air-actuated fluid augmentation device; an air controller for providing controlled high pressure air; and a high pressure control supply air to the fluid augmentation device when activated, and An air valve actuated by an electrical solenoid to expel air from the fluid augmentation device when inactive, a means for initiating the actuation of the electrical solenoid, and an actuation of the electrical solenoid at a time in response to mandrel breakage. A rivet setting tool having means for doing. 2. A rivet setting tool according to claim 1, wherein the means for ending the operation of the electric solenoid is a timer, and the means for starting the operation of the electric solenoid further comprises means for starting the timer. 3. The rivet setting tool according to claim 1, wherein the means for ending the operation of the electric solenoid is an acceleration sensor means. 4. The rivet setting tool of claim 1 wherein the means for terminating the actuation of the electrical solenoid is fluid pressure sensor means. 5. The rivet setting tool of claim 1 wherein the means for terminating the actuation of the electrical solenoid is fluid piston displacement sensor means. 6. The rivet setting tool of claim 1 wherein the means for terminating the actuation of the electrical solenoid further comprises means for varying the termination time.