Rivet setting tool

Details Rivet setting tool Rivet setting tool

1999-12-07

2001-05-01

Jones, David (Department: 3725)

Metal working

Means to assemble or disassemble

Overedge assembling means

C029S243525, C072S391400

Reexamination Certificate

active

06223409

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a rivet setting tool and particularly to a blind-rivet setting tool showing a decreasing operating force.
BACKGROUND OF THE INVENTION
A blind-rivet is a work piece having a head, a thin walled sleeve portion and a nut and is to be inserted into an opening in a wall or sheet. Fixing of the blind-rivet is by deforming the sleeve portion to a bulge so that the wall or sheet is clamped between head and bulge or flange of the rivet. For performing this rivet setting operation, a screw-threaded bolt or drift is provided at the end of the rivet setting tool which is screwed into the nut so as to engage the same and pull the nut in the direction of the wall or sheet. When doing so, the sleeve portion of the rivet is deformed to make the bulge which takes the shape of a flange. When this has occurred, the danger of damaging the internal threads of the nut will arise by the persisting force of the rivet setting tool. On the other hand, much force is required to initiate bulging of the sleeve portion of the rivet.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a rivet setting tool which makes it possible to set rivets without the danger of damaging the nut of the rivet.
It is a further objective of the invention to provide a rivet setting tool which is very simple in construction and which can be produced economically.
Another objective of the invention is to provide a rivet setting tool which developes a decreasing force in riveting.
It is also an objective of the invention to provide a rivet setting tool which stores power for being delivered at the beginning of the working stroke of the tool.
The rivet setting tool of invention comprises a screw-threaded bolt or drift connected to a support block, and a housing member carrying an anvil. A driving apparatus is provided to pull the screw-threaded bolt or drift relative to the anvil. In a preferred embodiment of the invention, the driving apparatus includes a toggle lever arrangement comprising a pair of hand levers and a pair of linking levers. The toggle lever arrangement is such that the force transmission ratio at the beginning of the working stroke, i.e. the relative movement between bolt or drift and anvil, has a high value, whereas at the end of such a movement or stroke has a lower value such that enough force is developed for deforming the thin walled sleeve of the rivet, yet the danger is avoided of damaging the thread of the nut at the end of the working stroke.
In another embodiment of the invention, a pneumatic-hydraulic drive apparatus is provided which includes an energy store to be loaded by the pneumatic-hydraulic drive apparatus. The arrangement is such that the force at the beginning of the working stroke is highest and decreases to the end of the working stroke.
Other objectives, features and advantages of the invention will be apparant from the following detailed description taking in connection with the accompanying drawings.


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