Process for making a file and article resulting therefrom
AssigneeWallace Murray Corporation
InventorEdward W. Staley, Jr.
Life of this patent
Estimating the term…
Abstract
A process for making a file wherein the formation of the file teeth by striking a blank with a chisel-like bit also forms sharp serrations on the back sides of the teeth adjacent the cutting edge, with the improvement of preserving such serrations without substantial removal thereof during the cleaning and finishing steps of such file making process. Such process may include cleaning a formed and hardened file by directing a pressurized stream of frangible glass beads at the file to remove undesired materials associated with the hardening step. The file resulting from such process retains the serrations on the back sides of the teeth whereby wearing away of the original cutting edges of teeth during use serves to expose for cutting purposes some of the sharp serrations.
Claims10
In a process for making a cleaned and finished file wherein crowned teeth, each having a front cutting side and a back side, are formed by chisel blows against a file blank and wherein sharp serrations extending longitudinally of each said tooth are formed on the back side of each said tooth adjacent the cutting edge thereof and then are hardened by heat treating, the improvement of preserving said serrations without substantial removal thereof during the subsequent cleaning and finishing steps of said process.
In a process for making a cleaned and finished file wherein crowned teeth, each having a front cutting side and a back side, are formed by chisel blows against a file blank and wherein sharp serrations extending longitudinally of each tooth are formed on the back side of each said tooth adjacent the cutting edge thereof, and then said teeth are hardened by heat treating and are cleaned and finished, the improvement which comprises contacting said file with a pressurized stream of substantially non-eroding material to effect said cleaning and finishing of said file without substantial removal of said serrations.
In a process for making a file wherein the formation of the file teeth by striking a blank with a chisel-like bit also forms sharp serrations extending longitudinally of said teeth on the back sides of the teeth, such process including hardening the formed file by immersion of the file in a molten solution aand then cleaning said file, the improvement comprising:
- said cleaning process comprising directing a pressurized stream of frangible glass beads against such file under a predetermined pressure such that undesired materials associated with the hardening process are removed from said file while retaining said sharp serrations on said teeth back sides.
A file having teeth formed by chisel blows against a file blank, each of said teeth having a front side and a back side and each said tooth back side having a plurality of sharp serrations extending longitudinally of said tooth, generally parallel and adjacent the cutting edge thereof, said serrations formed by said chisel blows and preserved in the hardened, cleaned and finished file, whereby, in use of said file, wearing away of said cutting edge serves to expose for cutting purposes one or more of said sharp serrations.
A formed, hardened, cleaned and finished file with each of the teeth thereof having a front side and a back side and a cutting edge formed by the conjunction of said front side and said back side and also having cutting structure disposed on said back side adjacent and generally parallel to said cutting edge, said back side cutting structure being preserved in the finished file, whereby, in use of said file, wearing away of said cutting edge serves to expose for cutting purposes said back side cutting structure.
Dependencies are inferred from the claim text.