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You Get
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Energy conservation: Because of
its unique design and the use of a smaller compressor, the "Gentle Jack"
jackhammer will deliver the same impact on far less energy use. While it
takes 100 pounds of air pressure per square inch to drive the standard air
hammer, the "Gentle Jack" jackhammer is propelled by half that amount. 84
cubic feet of air per minute are required to drive the standard tools, but it
only takes 21 cubic feet per minute for the Gentle Jack.
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Durability, low maintenance:
Standard air hammer machinery vibrates itself and all attached equipment so
violently that costly and serious maintenance problems arise almost
immediately. "Gentle Jack" vibration is so minimal that you can put a quarter
on the top of it while it's operating, and the coin will not fall off. By
reducing the vibration, metal fatigue failures are virtually eliminated, and
there is far less stress on metals and moving parts. In addition, "Gentle
Jack" has fewer parts. Fewer parts and longer part life mean yields less
maintenance.
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Lower costs: Because "Gentle Jack"
has half as many parts as a conventional jackhammer, it is far less expensive
to manufacture, operate and maintain. "Gentle Jack" has only 27 parts, whereas
the standard machines have 42 or 44 parts. The wear parts in the "Gentle Jack"
are also inexpensive, as opposed to the parts that would need replacing in a
standard jackhammer. To keep a conventional breaker operating over the course
of a year might cost ten times what might be spent on parts for the "Gentle
Jack". The improved design of the "Gentle Jack" increases the life of
the breaker point and chisel by several orders of magnitude.
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Light and Easy to Handle: Because
"Gentle Jack" uses a much smaller compressor, it is therefore lighter to
handle and easier to haul. Instead of the common 25 horsepower engine needed
to power standard hammers, "Gentle Jack" uses either a 5 hp electric
compressor or an 11 hp gas engine. It might take two men to move a 25 hp
compressor, one man alone can easily handle "Gentle Jack’s” engine and
compressor unit. The tool itself is lighter by several pounds, and the
weight of the gad (point for breaking rock) is more than twice as heavy.
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More work production and less
downtime: Because it requires no inter cooler, after cooler or receiver,
there is minimal equipment downtime. Because it is lighter and easier to move
and operate, there will be less worker downtime. Gentle Jack takes
approximately 35 pounds of downward pressure to operate, which means that just
about anyone can operate it. And, with less vibration and noise, there is less
wear and tear not only on the equipment, but on the operator as well, so
there's potentially fewer injuries with less sick time, allowing more
productive work time from workers.
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Environmental consideration:
"Gentle Jack” emits very little sound in contrast with today's jackhammers.
Sound engineers who measured the noise output of this system compared to the
standard system and the relative noise in absolute terms, shows that an
un-muffled jackhammer, would be ranked 100; a muffled jackhammer would then
rank at 17, which is still loud. "Gentle Jack" ranks at 3.13.
Jackhammer
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One of the key differences is that this tool utilizes heat and
doesn't exhaust it with a loud bang. The air input temperature in the "Gentle
Jack's" system is 210 degrees Fahrenheit, while standard equipment uses a cool 80
degrees.
When air is compressed, it heats up. Conventional compressors and breakers throw
away most of this heat energy and compression energy contained in the air to drive the
breaker.
The exhaust air is at ambient temperature and atmospheric pressure. This
eliminates freeze up and exhaust noise. The problems of exhaust freeze, exhaust fog and
excess dust cannot occur with the Gentle Jack equipment.
The Vibration less operation is based
on two key points. There is a constant air pressure between the piston hammer and the housing
throughout the stroke cycle, powering the down stroke of the piston but resulting in no
variable forces being imparted to the tool or the operator.
The system then allows a
variable air pressure, powering the upstroke of the piston which works simultaneously on
equal areas of the lower face of the piston and the upper face of the breaker point.
Because of the equal areas, the forces are confined to the hammer being urged in an upward
direction thus preparing for another down stroke and the breaker point being urged downward
against the rock or concrete.
This concept utilizes all of the compression forces and
compression heat invested in the equipment.
A spring-loaded valve and radial ports on a central air tube
control air movement through a pneumatic concrete breaker. The tool's hammer is isolated
from its housing and rides on a column of hot expanding air.
As a result, the unit is
nearly Vibration-less. Traditionally, jackhammers have employed a reciprocating,
pneumatically-driven piston, striking many blows each minute, to break concrete. This new
design employs fewer but heavier blows to accomplish the same function.
In conventional jackhammers, the 4 to 5-lb. hammer usually has
a stroke of 2 to 3 inches and requires a 25-hp compressor and H.R.H. to provide input air
at about 80F. The Vibration less jackhammer employs a 17-lb. hammer moving through a stroke
of 11 inches. The breaker point also weighs about 17 lbs.
The design requires hot (250F) input air, which is allowed to
expand adiabatically against the hammer. After the hammer has been lifted into position
for a stroke, it's driven down by 50-psi input air. Input air pressure is held constant at
all times.
The hammer is not mechanically linked to the casing of the
tool and the air is exhausted for atmospheric pressure. So there's very little vibration
transmitted up the tool to the operator. In fact, one can balance a quarter atop the unit
while it's breaking concrete.
Pressurized air introduced to the tool from the compressor
through an insulated line exerts force against the external shoulder of hammer and
internal shoulder of the housing, forcing the hammer against the breaker point.
The point
is caught by a retainer hook. When the operator applies 30-lb. downward force, the
shoulder on the breaker point is stopped by rubber bumper rings.
Radial ports and internal
annulus on the hammer are then in register with the upper cross port in the central air
tube, permitting pressurized air to flow down the center tube to depress the valve piston
against a spring until it hits stop.
99% REDUCTION IN CASE VIBRATION
Over 50% REDUCTION IN NOISE EMISSION
73% REDUCTION IN ENERGY INPUT
50% LESS PARTS IN STRUCTURE
100% INCREASE IN SURVIVAL PARTS
GENTLE JACK Specification Chart Model VHB-80
Breaking Rate:
The Gentle Jack will hold its own against a
McDonald 60 lb. hammer and will do 90% of what an 80 lb. will do but without the wear
and
tear on the operator or the equipment.
| Breaker Weight |
80 lb. |
| Power Unit Weight |
135 lb. to 275 lb. |
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Breaker with Gad Size |
41" |
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Power Unit Size |
3' x 2' x 1.5' |
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Power Requirement |
5 hp electric or 11 hp
gasoline |
| Noise at 7 meters |
80 d.b.a |
| Noise at 1 meter |
96 d.b.a. |
Breaker Weight
80 lb.
Power Unit Weight
135 lb. to 275 lb.
Breaker with Gad Size
41"
Power Unit Size
3' x 2' x 1.5'
Power Requirement
5 hp electric or 11 hp gasoline
Noise at 7 meters
80 d.b.a.
Noise at 1 meter
96 d.b.a.
Makes half the audible noise of a conventional
hammer
| Vibration Amplitude
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.003"
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| Operator Force Required
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35 lb.
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Energy Feedback to operator: 3 ft. lb./min. -
Conventional hammers are more like 1500 foot-lbs./min.
| Parts in Breaker
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27
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| Operating Control
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Automatic
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Functions of 80# "Gentle Jack"
Some require attachments:
Breaking concrete
Cutting asphalt paving
Compacting - tamping
Driving stakes - setting forms
Driving posts
Driving pipes for water wells
Driving interlocking shoreline steel
Cutting tree roots
Cutting frozen earth
Cutting stone
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Drilling holes in rock and other material
Cutting rebar and concrete
Cutting off rivet heads and bolts
Boulder breaker
Grizly
Mining Equipment
Chipper (8 lb. - 20 lb.) Available soon
Stopper
Rock Drill
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Next, air flows into the space between the rear face
of the breaker point and the lower hammer face. As air expands, it raises the hammer, the
internal hammer annulus passes the upper port in center tube, cutting off air flow through
this passage. The hammer operated by expansion of hot input air.
Standard, heavy-duty concrete
breakers deliver 87 ft-lb. impact with 75 to 100 psig input air. Our breaker
produces 135 ft-lb. impact with 50 psig air, 194 ft-lb. with 75-psig air.
Expanding air under the hammer raises it to near
top position in housing. Air pressure beneath the hammer drops from 50 to 0 psig and air
temperature drops from 250 to 90F as air expands adiabatically.
As hammer rises,
pressurized air outside the hammer, but inside the housing, is forced into the air supply
line. This air movement ensures constant down force on the hammer throughout the stroke
cycle and constant up force on the cylinder housing.
Lower control valve's piston begins
rising as pressure on it decreases. After the hammer reaches top of stroke, 50-psig air
acts on the hammer shoulder to start it moving down toward breaker point. The control
valve's piston reaches its top position.
As the hammer descends, air below the hammer is
forced past the valve piston's stem and out through ports in the breaker point shoulder to
atmosphere. Because exhaust is at atmospheric pressure, there's no detonation or exhaust
noise.
Contact Me
to get my demonstrator model today for only $7750!
Compare
with approximately $12,000 for the inefficient conventional system that beats you to
death.
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