Tool driving or impacting – Impacting devices – Length of cyclic travel of hammer head selectively adjustable
Reexamination Certificate
2001-06-07
2003-01-21
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Length of cyclic travel of hammer head selectively adjustable
C173S132000, C173S200000, C173S206000
Reexamination Certificate
active
06508315
ABSTRACT:
BACKGROUND OF THE INVENTION—FIELD OF INVENTION
The present invention relates to impact power tools and, more particularly, to an improved hand-held impact power tool for delicate hand engraving and stone setting in the hand engraving and jewelry fields.
BACKGROUND OF THE INVENTION—Description of Prior Art
An impact power tool is known from my earlier U.S. Pat. No. 6,095,256, to Lindsay, which may be used for engraving, carving and delicate stone setting operations.
Although the known impact power tool mentioned above provides improved control of delicate hand-working operations not previously available, it would be desirable to provide an impact tool with a feature that will provide greater ease of use. A known embodiment disclosed in my earlier U.S. Pat. No. 6,095,256, to Lindsay, uses a feature to adjust the impacting characteristics of the tool. This feature is beneficial to users, however modifying this impacting adjustment takes valuable time from the jeweler or engraver, as two setscrews need to be loosened before the user can begin to adjust the tool. The feature utilized the end of a screw for the impact location within the bore of the tool. When the user adjusts this screw and thus the location of impacts, it allows the piston to enter into the front chamber letting more or less exhaust be released. It allowed more or less air pressure stored in the rear chamber to pass through the piston to the front chamber and to the atmosphere. When more air pressure was relieved from the rear chamber the piston was allowed to make a longer return stroke and thus harder impacts in the forward stroke. If this feature could adjust a floating tool holder or anvil with a rotating barrel on the outside of the handpiece it would make the impact tool more user friendly.
Floating tool holders and anvils in hand held impact power tools are not new. U.S. Pat. Nos. 6,085,850, 5,803,183, 5,449,044, and 4,030,556, all to Phillips, utilize rubber o-rings to float an anvil that attaches to a tool holder. U.S. Pat. No. 6,021,574, to Murray, utilizes rubber o-rings to float a tool holder. Owner's manual titled
GRS Tools
901
Handpiece
written by Glendo Cooperation, page 3, depicts an impact tool using o-rings to float an anvil. O-rings used in these configurations will return the tool holder or anvil to its original location after each impact or blow of the piston. What is needed to construct a more user friendly length of stroke adjustment than what is depicted in my earlier impact tool U.S. Pat. No. 6,095,256 is a way for the user to manually, yet quickly, adjust the anvil and/or tool holder and thus alter the impacting location.
OBJECTS AND SUMMARY OF THE INVENTION
In my earlier invention U.S. Pat. No. 6,095,256, an impact tool was depicted with a manual adjusting length and speed of piston stroke mechanism. The present invention includes a more convenient mechanism to adjust this length and speed of piston stroke. The mechanism includes a rotating barrel protruding around the outside diameter of the body of the impact power tool that may be turned for adjusting a floating tool-holder. This will alter the distance between the annular ring within the bore and the impact location of the piston. Adjusting how far the piston enters into the front chamber of the handpiece will determine how much pressure in the rear chamber is relieved on each piston forward stroke. The amount of pressure relived at the end of the forward stroke will determine the length of the return piston stroke and thus the overall power of the impacting tool. A rotating barrel around the outside of the tool will provide a tool that is more versatile and easily altered by the user to his or her liking.
It is also an object of this invention to provide a simplified mechanism to adjust the stroke length that is inexpensive to manufacture and assemble.
REFERENCES:
patent: 3393755 (1968-07-01), Glaser et al.
patent: 4030556 (1977-06-01), Phillips
patent: 4416338 (1983-11-01), Nelson et al.
patent: 4502824 (1985-03-01), Dohse et al.
patent: 4694912 (1987-09-01), Glaser
patent: 4903784 (1990-02-01), Glaser
patent: 5203417 (1993-04-01), Glaser
patent: 5449044 (1995-09-01), Phillips
patent: 5515930 (1996-05-01), Glaser
patent: 5803183 (1998-09-01), Phillips
patent: 6021574 (2000-02-01), Murray
patent: 6085850 (2000-07-01), Phillips
patent: 6095256 (2000-08-01), Lindsay
Author: Glendo Cooperation, Title: “GRS Tools 901 Handpiece” (Owner's Manual), Date: Mar. 2001, Published: in USA, Pertinent page is p. 3 containing a parts list and exploded drawing. Pertinent part numbers on p. 3 are: 004-407 (anvil), 002-948 (O-Ring).
Owner's manual titled: “Air Graver Instructions”, published by Danville Engineering, Inc. publish date: Before May 14, 1996.
Copy of photograph taken of disassemble “Air Graver” made by Danville Engineering, Inc.
Copy of cover and p. 165 of catalog titled “1995 1996 Brownells” published by Brownells, Inc. 1995.
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