240 ONE MAN HOLE DIGGER, FORM GOM26010601, VERSION 2.0, AUTHORIZATION: DVR, PAGE: 17
A HOLE DIGGER WITH AN IMPROPERLY
MAINTAINED ENGINE THROTTLE CONTROL WILL
"SPIN" ABOUT ITS AXIS WHEN THE OPERATOR
L
OOSES PARTIAL AND/OR FULL CONTROL. IN
THE EVENT OF THIS OCCURRENCE, DO NOT
A
TTEMPT TO STOP THE ENGINE BY GRASPING
THE ROTATING OPERATOR HANDLE. DO NOT
INTRODUCE ANY FOREIGN OBJECT IN AN
ATTEMPT TO STOP AND/OR BLOCK THE
ROTATING HANDLE. INSTEAD, ALLOW THE
ENGINE TO EXHAUST ITS FUEL SUPPLY.
DETERMINE THAT ALL COMPONENTS OF THE
ENGINE THROTTLE CONTROL ASSEMBLY ALLOW
FOR PROPER FUNCTION BEFORE ATTEMPTING
TO FURTHER UTILIZE THE HOLE DIGGER.
MINIMIZING KICKBACK FROM A DESIGN
STANDPOINT.
1) The 240 Hole Digger features the widest operator
handle of any machine in its class. The handle is
biomechanically positioned to enhance control by
allowing the operator to exert "body english" against
the torque and kickback generated by the digging
process.
2) The Hole Digger utilizes an antivibration material
(PVC coating) that is applied to the operator handle
during the manufacturing process. This material is
intended to enhance control and help dampen the
torque and kickback experienced by the operator
during the digging process.
3) The Hole Digger utilizes a twist grip throttle control.
This type of throttle control device was selected over
other configurations (for the operator handle
configuration utilized and specific digging power)
because it allows the operator to wrap his thumb
around the forefinger and effectively maximize the
strength in his right hand. This design feature affords
the operator greater control of the machine when
counteracting the effects of torque and kickback during
the digging process.
4) The Hole Digger is designed to utilize the General
Equipment Company PN 2121 Auger Pin to retain the
earth auger to the transmission driveshaft. This pin is
not intended to shear and absorb kickback related
forces when the earth auger comes in sudden contact
with a buried object. The pins are utilized for the
following reasons:
a) Such an occurrence (pin shear) would result in
extensive physical damage to the driveshaft and auger
drive hub.
b) Even if the physical damage to the Hole Digger
could be eliminated and/or minimized from the actual
process, it could require an unknown (and potentially
l
arge) number of auger pins to complete the digging
process for any specific hole.
c) Even if the cost of replacement auger pins is not a
factor, the resulting productivity produced by the actual
process would not be deemed acceptable by industry
and/or social standards for the Hole Digger.
d) Given the infinite number of soil conditions which
could be encountered during the actual process, it is
impossible to design and supply a specific auger pin to
shear at a specific torque value which would produce
acceptable operational results for the Hole Digger.
e) Given the infinite number of potential operators and
their methods utilized during the actual process, it is
impossible to design and supply a specific auger pin to
shear at a specific torque value which would produce
acceptable operational results for the Hole Digger.
f) Given the infinite number of combinations of soil
conditions, auger diameters, auger boring head
conditions, digging depths, mechanical operating
conditions, operators and operator methods
encountered during the actual process, it is impossible
to design and supply a specific auger pin to shear at a
specific torque value which would produce acceptable
operational results for the Hole Digger.
6) For comparison purposes, it is interesting to note
that portable electric drills do not utilize any torque
limiting or clutch device to allow the drill bit to slip at
any specific torque value for drilling purposes. As with
a Hole Digger, such a device would make the drill a
useless tool because of the infinite number of potential
operating configurations and the inability to design
specific components to meet the requirements of each
operating configuration.
7) Many portable electric screwdrivers incorporate a
torque limiting or clutch device which allows the
operator to preset the torque output of the tool to a
specific value. This is especially useful and desirable
when hardware can be secured to specific torque
values according to industry published standards.
8) Portable electric drills and screwdrivers are two
separate tools designed for different and specific job
applications. The drilling process has different
requirements than the fastening process offered by
screwdrivers. The operational characteristics of
portable electric screwdrivers can not be confused
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