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Title: Double acting bit holder

Abstract

A double acting bit holder that permits bits held in it to be resharpened during cutting action to increase energy efficiency by reducing the amount of small chips produced. The holder consist of: a stationary base portion capable of being fixed to a cutter head of an excavation machine and having an integral extension therefrom with a bore hole therethrough to accommodate a pin shaft; a movable portion coextensive with the base having a pin shaft integrally extending therefrom that is insertable in the bore hole of the base member to permit the moveable portion to rotate about the axis of the pin shaft; a recess in the movable portion of the holder to accommodate a shank of a bit; and a biased spring disposed in adjoining openings in the base and moveable portions of the holder to permit the moveable portion to pivot around the pin shaft during cutting action of a bit fixed in a turret to allow front, mid and back positions of the bit during cutting to lessen creation of small chip amounts and resharpen the bit during excavation use.

Inventors:
 [1];  [2];  [3]
  1. (Blommington, MN)
  2. (Minneapolis, MN)
  3. (Eagan, MN)
Publication Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
869434
Patent Number(s):
US 5335977
Assignee:
United States of America as represented by Secretary of (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
double; acting; bit; holder; permits; bits; held; resharpened; cutting; action; increase; energy; efficiency; reducing; amount; chips; produced; consist; stationary; base; portion; capable; fixed; cutter; head; excavation; machine; integral; extension; therefrom; bore; therethrough; accommodate; shaft; movable; coextensive; integrally; extending; insertable; permit; moveable; rotate; axis; recess; shank; biased; spring; disposed; adjoining; openings; portions; pivot; turret; allow; front; mid; positions; lessen; creation; chip; amounts; resharpen; base portion; double acting; bit holder; portion capable; energy efficiency; cutter head; spring disposed; extending therefrom; acting bit; /299/

Citation Formats

Morrell, Roger J., Larson, David A., and Ruzzi, Peter L. Double acting bit holder. United States: N. p., 1994. Web.
Morrell, Roger J., Larson, David A., & Ruzzi, Peter L. Double acting bit holder. United States.
Morrell, Roger J., Larson, David A., and Ruzzi, Peter L. Sat . "Double acting bit holder". United States. doi:. https://www.osti.gov/servlets/purl/869434.
@article{osti_869434,
title = {Double acting bit holder},
author = {Morrell, Roger J. and Larson, David A. and Ruzzi, Peter L.},
abstractNote = {A double acting bit holder that permits bits held in it to be resharpened during cutting action to increase energy efficiency by reducing the amount of small chips produced. The holder consist of: a stationary base portion capable of being fixed to a cutter head of an excavation machine and having an integral extension therefrom with a bore hole therethrough to accommodate a pin shaft; a movable portion coextensive with the base having a pin shaft integrally extending therefrom that is insertable in the bore hole of the base member to permit the moveable portion to rotate about the axis of the pin shaft; a recess in the movable portion of the holder to accommodate a shank of a bit; and a biased spring disposed in adjoining openings in the base and moveable portions of the holder to permit the moveable portion to pivot around the pin shaft during cutting action of a bit fixed in a turret to allow front, mid and back positions of the bit during cutting to lessen creation of small chip amounts and resharpen the bit during excavation use.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}

Patent:

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