JP2918362B2 - Riveting tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rivet setting tool that relies on air pressure as a driving force.

[0002]

BACKGROUND OF THE INVENTION Riveting tool operators generally understand that the speed of a rivet tool is a function of the supplied air pressure, and thus the operator tends to increase the air pressure to increase workability. is there. However, such tools are designed to operate within a selected pressure range, and operating beyond this range will result in rapid wear of the mechanism.

[0003] Accordingly, it is an object of the present invention to prevent a rivet tool from operating beyond the allowable pressure range. Other objects and advantages of the present invention will become apparent from the following description of the specification and the accompanying drawings, which illustrate, by virtue of the patent laws, a presently preferred embodiment employing the principles of the invention.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The rivet setting tool 10 includes a forming trigger 12 which can be pivoted about a trigger point 13, which has a cam surface 14 along its bottom surface. This cam surface can engage a displaceable shaped cam follower in the form of a cylindrical rod holder 16. Rod holder 16
Push rod 1 that can be displaced up and down in vertical bore 17
8 are retained by retaining pins 19 located in appropriate slots 20 provided therein. Between the push rod head 24 and the rod holder bottom shoulder 26,
Inner and outer springs 28 are installed in a compressed state. The ends of the slot 20 define a fully retracted position and a fully extended position of the push rod relative to the rod holder 16.

[0005] Below this pressure regulator assembly,
A conical surface double acting poppet valve 30 is installed, which is supported in a suitable bore 32. This bore 32 communicates with a bore 34 in which the pressure regulator assembly is located. In normal operation, trigger 1
2 is released (shown position), pressurized inlet air from an external source, which enters the poppet valve bore 32 through the opening 36 below the poppet valve, presses the lower valve seal 38 to the closed position, and the pressure regulator Raise the assembly and return the trigger to its deactivated position. At this time, the air from the tool chamber flows to the exhaust port 44 through the conduit 40 and the exhaust side where the poppet valve is open. In normal operation, pulling the trigger lowers the pressure regulator assembly, sealing the upper valve seal 46 to the valve body 48, opening the inlet side and allowing supply air to flow through the conduit 40 into the tool chamber.

[0006] The strength of the spring 28 is such that if the inlet air pressure exceeds a certain specified pressure when the trigger is depressed and urges the system, the spring is compressed and the rod pushes against the fixed push rod 18. -It is selected so that the holder 16 can be displaced downward. Thus, the inlet side of the valve remains sealed, and the outlet side keeps the tool chamber connected to the exhaust conduit, thus preventing the tool from operating at excessive pressures that could be damaged.

[Brief description of the drawings]

FIG. 1 is a longitudinal cross-sectional view of a portion of a rivet tool constructed in accordance with the teachings of the present invention.

FIG. 2 is a view similar to FIG. 1, but showing the valve in an open position;

[Explanation of symbols]

 Reference Signs List 10 Riveting tool 12 Trigger 13 Trigger point 14 Cam surface 16 Rod holder 17 Vertical bore 18 Push rod 19 Holding pin 20 Slot 24 Head part 26 Bottom shoulder part 28 Spring 30 Poppet valve 32 Bore 34 Bore 36 Opening 38 Lower valve seal 40 Conduit 44 Exhaust port 46 Upper valve seal 48 Valve body

Claims (1)

(57) [Claims] 1. An air line from a tool room to an inlet line,
A two-way poppet valve connected alternately to the exhaust line,
A poppet valve including a spool assembly having a body and upper and lower valve seals, a trigger displaceable between a release position and a depressed position, having a cam surface, and a trigger disposed between the trigger and the spool assembly. A retractable rod assembly that is displaceable between upper and lower positions, and that supports a push rod having a head portion and the push rod, and has a relative advance position and a retracted position relative to the push rod. A rod assembly including rod holder means that can be selectively moved between the rod assembly and a push rod between the head of the push rod and the rod holder means; Spring means for holding the push rod in position to resist displacement of the push rod to the retracted position. As long as the working air pressure is less than the maximum pressure, the push down of the trigger displaces the rod assembly to move the push rod in the advanced position from the upper position to the lower position, Thereby, the inlet side of the poppet valve is opened,
When the working air pressure exceeds the maximum pressure, the pressure overcomes the spring to displace the push rod from the advanced position to the retracted position, and to select to close the inlet side of the poppet valve. Riveting tool.