Double acting bit holder

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869434

Morrell, Roger J ^[1]; Larson, David A ^[2]; Ruzzi, Peter L ^[3]

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1. Blommington, MN
2. Minneapolis, MN
3. Eagan, MN

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.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
• Assignee: United States of America as represented by Secretary of (Washington, DC)
• Patent Number(s): US 5335977
• OSTI ID: 869434
• Country of Publication: United States
• Language: English

Related Subjects

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/