Double acting bit holder
Patent
·
OSTI ID:869434
- Blommington, MN
- Minneapolis, MN
- 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, Pittsburgh, PA, and Morgantown, WV
- 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
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Related Subjects
/299/
accommodate
acting
acting bit
action
adjoining
allow
amount
amounts
axis
base
base portion
biased
bit
bit holder
bits
bore
capable
chip
chips
coextensive
consist
creation
cutter
cutter head
cutting
disposed
double
double acting
efficiency
energy
energy efficiency
excavation
extending
extending therefrom
extension
fixed
front
head
held
holder
increase
insertable
integral
integrally
lessen
machine
mid
movable
moveable
openings
permit
permits
pivot
portion
portion capable
portions
positions
produced
recess
reducing
resharpen
resharpened
rotate
shaft
shank
spring
spring disposed
stationary
therefrom
therethrough
turret
accommodate
acting
acting bit
action
adjoining
allow
amount
amounts
axis
base
base portion
biased
bit
bit holder
bits
bore
capable
chip
chips
coextensive
consist
creation
cutter
cutter head
cutting
disposed
double
double acting
efficiency
energy
energy efficiency
excavation
extending
extending therefrom
extension
fixed
front
head
held
holder
increase
insertable
integral
integrally
lessen
machine
mid
movable
moveable
openings
permit
permits
pivot
portion
portion capable
portions
positions
produced
recess
reducing
resharpen
resharpened
rotate
shaft
shank
spring
spring disposed
stationary
therefrom
therethrough
turret