Note: Descriptions are shown in the official language in which they were submitted.
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TITLE: 3-SKI SNOW BIKE
DISCRIPTION OF INVENTION:
TECHNICAL FIELD ¨ Skiing, Biking (Combining biking and skiing by attaching 3
skis to a bicycle).
BACKGROUND ART
Most current ski-bikes are made by removing the front and back wheels of an
existing
bicycle and attaching a front and rear skis instead of wheels. This enables a
person to ride
on the 2-ski snow bike down the snow covered mountain. However, the 2-ski
bikes are not
very stable, long front ski makes turning harder, the ski length are not easy
to change
because the front ski interferes with the back ski, and kid's skis do not have
sufficient
surface to support an adult rider requiring special wider skis. Our 3-ski bike
design (short ski
in the front and 2 long skis in the back) is superior because the 3-ski snow
bike is more
stable, especially when the snow bike is sliding. And, the 3-ski bike design
shifts the rider's
weight back, allowing a smaller ski to be used in the front, which is
desirable for efficient
turning.
The other 3-ski sleds and snow vehicles connect rear skis to a frame with a
solid bar that
does not allow up/down rear skis motion, U bar with springs that permit rear
skis to move
(US 5335925), leaf springs supports (EP 0799763 A2), and parallelogram
arrangement
supports (US 2007/0257452). This invention uses other mechanisms like
horizontal pivot
bar, steering bar, vertical pivot bar, or 2 swinging spring shocks and rear
supports to connect
rear skis to bicycle frame. Our designs allow the 2 rear skis to move up/down,
permitting
the 3-ski snow bikes to lean into turns, similar to biking and skiing motion.
Additionally a lot of ski bikes do not have a breaking system. Rider uses
his/her feet to
drag along the snow or side slide with the ski bike to slow and stop the ski-
bike. Our 3-ski
snow bikes have 2 braking system, a bar dragging on/digging into the snow and
snow
plowing by pushing out the outside ski.
Other cross country snow vehicles (with a track or rear wheel) are similarly
designed as
a 2-ski bike with its flaws. Our cross country 3-ski designs keep rear bicycle
wheel for
moving and attaches 2 rear skis on each side of rear wheel for sliding and
balance.
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ADVANTAGES OF INVENTION
The advantages of the 3-ski bike design are: (1) The 1 ski in the front and 2
skis on the
sides/rear, make the 3-ski snow bike stable. (2) The short front ski allows
for better
maneuverability. (3) Raising the steering bar with extension tubes changes the
angle rider
sits on the snow bike, thus allowing better load distribution and more natural
skiing position
for the rider. (4) Enabling the rear skies to move up/down allows the 3-ski
snow bike to lean
during turns. (5) The two rear shock springs and stabilizing spring/turnbuckle
provide for a
smooth ride and even load distribution over snow. (6) The 3-ski snow bike is
also equipped
with 2 braking systems in addition to turning and sliding skiing techniques
that can be used.
(a) The hand brake system utilizes the bicycle brake or gear cable to lift
front ski, and (b) the
foot brake that pushes a solid rod into the snow to provide drag for quicker
braking and
stopping. (7) The snap in ski attachment allows the rider to connect different
length and
types of skis easily. And (8) the 3-ski design can also be adapted to a
complete bicycle [with
pedals & rear wheel] so that the 3-ski snow bike also moves cross country.
DISCLOSURE OF INVENTION
This invention uses an existing bicycle frame (with or without rear wheel) and
attaches 1
front ski and 2 rear skis to the bicycle frame. The front bicycle wheel is
replaced by a short
front ski that is connected by 2 extension tubes at the bottom such that the
front ski pivots
between them. The top end of extension tubes go over the bottom of front
shocks, rigidly
secured and support the front end of the snow bike. The front brake cable is
extended and
lifts the front of ski to help with snow biking through powder.
The back end of the 3-ski snow bike is supported by 2 rear skis that are
attached with 2
support pipes to the sides of bicycle frame. The support pipes are connected
to frame such
that they allow the up/down motion of rear skis. 2 points of attachment are
required for
stability and can be done a couple different ways. (1) Cross-connecting the
front of support
pipes to the steering bar, (2) horizontal pivoting bar with a bolt in the
middle through frame
and support pipes attached at ends, (3) swinging rear springs attached by a
through bolt at
sides of pedal opening, (4) vertical pivoting bar with bolt in middle to
frame, or (5) vertical
pivoting bar with 2 rear supports at ends and a bicycle rear spring in the
middle. Our
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different designs use combinations of these connections to effectively
transmit the load of
the rider to the rear skis, while allowing the required up/down motion for
leaning.
The 2 support pipes continue back where they connect to the rear skis by snap
in
attachment that resembles standard ski-boot shape for easy connection of most
skis. Foot
lever brakes are mounted on the back section of each support pipe, and work
independently
by pushing a plate into the snow when force is applied to the foot brake
pedal, or push the
outside ski out. Also the front brake or gear cable is extended to tip of
front ski for easier
motion through powder.
Our ft design connects the front of support pipes to steering, with the rear
of frame
supported by 2 swinging rear shock springs. They are pin connect to the middle
of 2 support
pipes that run from steering bar to rear skis. The 2 - 3/4" steel support
pipes are bent to
shape described later, and cross each other such that they are able to move
up, down and
sideways without interfering with each other. This enables the 3-ski snow bike
to lean and
turn. The 2 rear spring shocks that attach at mid span of the support pipes
are pin
connected on top to the side of bicycle frame at pedal opening (one on each
side of the
bicycle frame), and swing such that they allow the up/down motion of rear
skis. The bottom
of the rear shock springs are also pin connected to the end of a brake bar or
to the support
pipe directly. Horizontal turnbuckle or stabilizing spring connects the 2
¨3/4" support pipes
or foot brake levers to prevent skis from sliding out. Additional support of
rider can be
provided by attaching the rear bicycle spring in the middle of a pivot bar
with rear supports
at each end going straight to ski attachments. (For snow bikes with rear
wheel, the support
pipes are bent such that the swinging springs connect to bicycle spring and
their motion
does not interfere with pedaling.)
The 2'd design connects the crossing support pipes to steering in front and a
vertical
pivot bar in the middle. This configuration provides the freedom of motion of
rear skis in
addition to steering control. The steering bar connection controls the leaning
of the 3-ski
snow bike, and the vertical pivot bar provides additional up/down motion of
rear skis on
steep slopes. Foot pedal brakes are installed on each support pipe to provide
braking for
the snow bike. (In snow bikes with rear wheel, the vertical pivot bar is also
moved higher
and support pipes bent such that they do not interfere with pedaling.)
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3rd design also connects the crossing support pipes to steering in front and
the rear of
support pipes attach to the bicycle rear shock by a horizontal pivot bar and 2
rear supports
at the rear ski attachments. The turnbuckle between the rear supports keeps
the rear skis
from sliding out as well as adjusts the distance between the rear skis, and
foot pedal brakes
on both support pipes stops the snow bike. (For 3-ski snow bike with rear
wheel, 2 rear
supports swing back and run from rear skis up to the sides of rear wheel and
hold up the
back of bicycle. The turnbuckle that connects the 2 rear supports keep the
rear skis
together and adjusts the width between rear skis. The pin connections of the
rear supports
to the frame permit the up/down motion of rear skis, and can also be adjusted
for various
snow depth. The 2 support pipes are also bent such that they do not to
interfere with
bicycle pedaling.)
Our 4th design attaches the 2 support pipes to each side of the bicycle with 2
horizontal
pivot bars, such that their ends can freely pivot up/down enabling the bike to
lean during
turns. The 2 support pipes are pin connected to the ends of the 2 pivot bars
that are
attached in the center to the bicycle frame by a 'A" bolt. The pivot bars
pivot about the
connection bolt, moving one end up as the other end moves down. This design
allows the
rear skis to move up/down as the bike leans during turns. The rear wheel and
pedals can
also remain attached, so that the 3-ski snow bike can also be used on level
surface as well as
to go downhill.
The 5th design also uses a horizontal pivot bar to attach the front of support
pipes to
frame. The midsection of support pipes is connected to sides of frame with 2
swinging rear
shock springs, allowing the rear skis to move freely up/down. The foot pedal 9
brakes
attached provide stopping power by pushing a bar into snow. (The 2 support
pipes can also
be bent and installed such that they do not interfere with each other or
bicycle pedaling.)
In our 6th design we similarly used a horizontal pivot bar to attach the front
of support
pipes to frame. The back of snow bike is supported by a bicycle rear spring
with a horizontal
pivot bar and 2 rear supports attached to support pipes at rear ski
attachments. The
turnbuckle keeps the rear skis from sliding outwards and provides for distance
between rear
skis. (For cross country snow bike the rear supports swing back and connect to
frame at the
rear wheel connection.)
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The above designs can also be adapted to work with a complete bicycle (pedals
and rear
wheel attached), giving us numerous designs for cross country snow bike. Some
of these
designs are shown in Figure 9. The connection points are moved up above the
bicycle
pedals and bending of support pipes is modified such that their motion does
not interfere
with the pedaling. The foot pedal brakes and rear ski attachments similarly
connect to the
bottom of support pipes.
These are some of configurations possible using the connection details
provided below.
Other designs can also be assembled using the details provided. Some of them
with 3 points
of support are shown in Figure 1. Additionally the 3-ski designs can be
attached to other
types of bicycle frames, some also shown in Figure 1. Even though these
designs are not
discussed, they also are included as part of invention.
DESCRIPTION OF DRAWINGS:
The basic 3-ski snow bike consists of bicycle frame 3 (with or without rear
wheel and
pedals), front ski 1 instead of front wheel, and 2 support bars 5 that attach
to the sides of
the bicycle frame and run down to the 2 rear skis 10. The support bars 5
attach to the
bicycle frame 3 such that as one of the rear skis 10 move up the other moves
down,
enabling the snow bike to lean. A foot pedal brake 9 is attached to each
support pipe 5 that
digs a bar into snow to slow and stop the snow bike. This invention covers the
different
ways of how the 2 support pipes 5 can be attached to bicycle frame 3, with the
rear wheel
and pedals attached for cross country snow biking, or removed for downhill
snow biking.
FIG.1 - VARIOUS DESIGNS OF DOWNHILL SNOW BIKES
This drawing shows the various 3-ski snow bike designs (described below) and
their
adaptation to different style bicycles to make a lightweight downhill racer,
or to complete
bicycle making it a 3-ski cross country snow bike. A "Mangoose" bicycle frame
with rear
spring was used because it is easy to remove the entire rear wheel assembly
(not needed for
downhill snow biking), however our designs are similarly adaptable to
different style frames.
FIG.2 - DESIGN 1 (Steering bar and swinging springs connection of support
pipes to frame)
This design connects the front of support pipes 5 to steering, with the rear
of frame 3
supported by 2 swinging rear shock springs 7. The 2 ¨ %" steel support pipes 5
are pin
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connected to the steering bar 2 and swing springs 7, and run from steering bar
to rear skis
10. They are bent to shape described later, and cross each other such that
they are able to
move up, down and sideways without interfering with each other. This enables
the 3-ski
snow bike to lean and turn. The 2 rear spring shocks 7 that attach at mid span
of the
support pipes 5 are pin connected on top to the side of bicycle frame 3 at
pedal opening
(one on each side of the bicycle frame), and swing such that they allow the
up/down motion
of rear skis. The bottom of the swinging shock springs 7 are pin connected to
the end of a
brake bar 9 or to the support pipes 5 directly. Horizontal turnbuckle or
stabilizing spring 6
connects the 2 support pipes 5 or foot brake levers 9 to prevent skis from
sliding out. And
the foot pedal brakes 9 permit the snow bike to slow down and stop.
FIG.3 - DESIGN 2 (Steering bar and vertical pivot bar connection of support
pipes to frame)
This 2'd design similarly connects the crossing support pipes 5 to steering
bar 2 in front
and a vertical pivot bar 12 in the middle. The steering bar 2 connection
controls the leaning
of the 3-ski snow bike, and the pivot bar 12 provides additional up/down
motion of rear skis
10 on steep slopes. Foot pedal brakes 9 are installed on each support pipe 5
that push a bar
into snow as brake pedal is pushed down. They work independently and the
amount of
braking depends on how much the brake bar digs into the snow.
FIG.4 - DESIGN 3 (Steering bar and bicycle spring connection of support pipes
to frame)
The 3rd design also connects the crossing support pipes 5 to steering 2 in
front and the
rear of support pipes 5 attach to the bicycle rear shock by a horizontal pivot
bar 12 and 2
rear supports 11 at the rear ski attachments. A second pivot bar 12 is needed
for stability at
midsection of rear supports 11, that attaches to frame 3 by 1/2" bolt and
keeps rear skis 10
from sliding out as well as adjusting the distance between them. The pin
connections allow
the snow bike to lean and the foot pedal brakes 9 are used to slow down and
stop the snow
bike. (For cross country snow bike the rear supports 11 swing back and attach
to sides of
the bicycle frame 3 at the rear wheel connection.)
FIG.5 - DESIGN 4 (2 horizontal pivot bars connection of support pipes to
frame)
In this 4th design we attached the 2 support pipes 5 to each side of the
bicycle 3 with 2
horizontal pivot bars 12, such that they can freely pivot up/down enabling the
bike to lean
during turns. The support pipes 5 are pin connected to the ends of the 2 pivot
bars 12, that
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are also attached in the center to the bicycle frame 3 with 2 ¨1/2" bolts. The
pivot bars 12
pivot about the connection bolts, moving one end up as the other end moves
down. The
attached foot brakes 9 move with support pipes 5 and slow the snow bike as the
pedal is
pushed down.
FIG.6 - DESIGN 5 (Pivot bar and swinging springs connection of support pipes
to frame)
The St" design uses a pivot bar 12 to attach the front of support pipes 5 to
frame 3. The
midsection of support pipes 5 is connected to frame 3 with 2 swinging rear
shock springs 7,
allowing the rear skis 10 to move freely up/down. The 2 support pipes 5 are
bent and
installed such that they do not interfere with each other or bicycle pedal
motion. And the
foot pedal 9 brakes attached provide stopping power by pushing a bar into
snow.
FIG.7 - DESIGN 6 Pivot bar and bicycle spring connection of support pipes to
frame)
In this design we also used a horizontal pivot bar 12 to attach the front of
support pipes
5 to frame 3. The back of snow bike is supported by a bicycle rear spring with
a horizontal
pivot bar 12 and rear support 11 attached to rear ski support pipes 5 at rear
ski attachments
8. The second pivot bar 12 along rear supports 11 provides stability and keeps
the rear skis
10 from sliding outwards. (For cross country snow bike rear supports 11 swing
back and
attach to sides of the bicycle frame at the rear wheel connection.)
FIG.8 ¨ ADAPTING THE 3-SKI DESIGNS TO DIFFERENT BICYCLE FRAMES
The downhill 3-ski designs can be similarly adapted to other bicycle frames.
Here we
provide a few examples using a Moto-bike frame, Compressor bicycle frame, a
child's bicycle
frame, and a newly build frame. There are a lot more designs possible using
the details
provided in this invention and are also part of the patent.
FIG.9 - ADAPTING THE 3-SKI DESIGNS TO CROSS COUNTRY SNOW BIKES
The above 3-ski snow bike designs can also be adapted to the bicycles with
rear wheel
and pedals attached, making the 3-ski snow bike able to move cross-country as
well as
downhill. The front wheel is similarly replaced with a front ski and
attachment of the
support pipes is moved up above the pedaling motion. The support pipes are
accordingly
bend such that they move between the pedals and their motion does not
interfere with the
pedals or each other's motion. The front brake cable is similarly attached to
the front ski
and the brake pedals installed below the bicycle pedals. This way a rider can
use bicycle
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pedals with rear wheel to move forward and the attached rear skis to slide on
snow. Most
of the above designs can be adapted for the cross country 3-ski snow bike.
This diagram
shows a few adaptations, however other variations of the above designs are
possible, and
are included as part of this invention.
FIG.10 - FRONT SKI AND 2 EXTENSIONS
The front ski 1 is a 2' cut ski tip or a kid's ski that is secured to 1" EMT
extension tubes 2
(1 on each side) by a bolt 57 through a bracket 55. The connection is about
1/2-1/3
distance from the back, perpendicular to the ski, with ski pivoting between
the 2 extension
tubes. The front ski 1 also has 2 ¨ 1/4"x6" runners 56 bolted lengthwise under
the front ski
on each side. These runners keep the front ski 1 from sliding sideway,
allowing it to glide
straight over the snow.
The extension tubes 2 are 1" EMT pipe about 18" long. One end it is connected
to the
front ski, and the other end is made slightly oval to fit over the bottom
section of the front
shock 51. This end is rigidly secured to the bottom of front shock 51 such
that the shock leg
extends straight to the front ski pin connection.
FIG.11 - STEERING BAR & CROSS CONNECTION
The 2 support pipes 5 are held up in the front by top of front steering shocks
13. The
pipe is pin connected by 1/2" bent bolt 15 through the support pipe, and a
1/2" coupling
bushing 14 which is pressed into the tube of the front shock. Since the
support pipe 5 is
able to rotate about the bolt 15, and bolt is able to rotate within the
bushing, the circular
motion of steering bar is transformed into the forward/up and back/down motion
of the
support pipes 5 that is needed for turning. By connecting left ski to the
right shock, and the
right ski to the left shock, the motion of support pipes 5 enables the ski
bike to lean in the
proper direction, thus utilizing the centripetal force generated by the snow
bike. However,
the support pipes 5 must bent such that they do not interfere with each other
during bike
operation. Additionally if the 1/2" connection bolt 15 can be bend 45'or 90',
thus providing
a second plane of rotation that allows support pipes 5 to move easier up/down.
FIG.12 - CROSS BENDING OF SUPPORT PIPES
The 2 support pipes 5 are 3/4" steel pipes that are attached to steering bar
59 and
extend back and down to the 2 skis 10 attached in the back. The 2 bars are
bent to shape
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such that they support the rear of the bicycle frame 3 at about mid section
and then extend
further back until rear ski connection 8. The 3/4" galvanized pipe is drilled
in front with a
Y2" hole for steering connection. The other end of the support pipe has a snap
in rear ski
connection 8 that resembles a standard ski boot for easy attachment to most
ski bindings.
At midsection the support pipe 5 has a foot brake 9 and back of bicycle frame
support
connected to it. The rear support is attached such that it allows the
forward/back motion of
the support bar 5 during steering. The support pipes 5 are bent such that they
are able to
cross each other and allow the forward/up and back/down motion without
interference
with each other, and bent again at rear support connection to bring the
bicycle seat lower,
with support pipes 5 extending back past the seat to rear ski attachments 8.
For ski-bikes with rear wheel, the support bars 5 are similarly connected in
the front.
The bending and crossing of pipes is modified such that the pipes run under
the bike frame
and do not interfere with pedal motion of the bicycle. They are pin connected
in the back by
a bolt to the 2 rear supports 11 , which hold up the back of 3-ski bike at the
rear wheel.
FIG.13 - REAR SHOCK SPRINGS WITH HAND BRAKES
The 2 rear shock springs 7 hold up the back of the bicycle frame 3. They are
rear bicycle
springs with a thinner spring and connected on top to the frame by a pivot bar
44 with 1/2"
bolt in the middle and 2 springs at ends. The bottom of rear spring shocks 7
are connected
to support pipes 5 with brackets 41, connected at 45', allowing the freedom of
motion for
support pipes 5. The 2 support pipes 5 are also interconnected with a
stabilizing spring 6
that restricts the sideway motion of support pipes 5 under the weight of
rider. The hand
brake cables 47 are attached to rear shock springs 7 and pull the rear skis 10
together and
parallel when engaged, or spread out and snowplow when released. Additionally
a foot
pedal brake 9 is attached to each support pipe 5 that digs a brake bar into
snow as rider
pushes down on the brake pedal 9.
FIG.14 - REAR SHOCK SPRINGS WITH LEVER FOOT BRAKE 1
The top of the rear spring shocks 7 are directly attached to the sides of the
bicycle frame
3 by a 1/2" bolt through pedal opening, and the bottom is pin connected to the
brake lever at
45' angle by a 5/16" eye bolt. The brake lever runs horizontal and made of 2-
1/4"x1"x18"
bars bolted together to work as one piece. It goes around the %" support pipe
5 and
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continues forward to the brake pedal 9 on the other end. The brake lever is
pin connected
to support pipe 5 by 3/8" bolt about 1/4 distance from rear spring and able to
pivot about the
bolt. So as the pedal end of brake bar is pushed down, the rear spring end
goes up and
under the rider's weight pushes the rear ski out enabling it to snowplow. A
turnbuckle 6
that connects the bottoms of shock springs 7 provide additional lateral
support. It is pin
connected, runs horizontal, and keeps bottom of rear shock springs from
sliding out and
used to set the distance between rear skis.
FIG.15 - REAR SHOCK SPRINGS WITH LEVER FOOT BRAKE 2
This is another way the foot brake lever 9 is used to force rear skis to
snowplow. The
top of rear shock springs 7 are directly connected to each side of pedal
opening by 7/2" bolt
into coupling 43 set rigidly inside the opening, allowing the rear shocks to
swing but not
move sideways. The turnbuckle 6 is used as additional sideway support, and the
connection
bolt 44 can be bent slightly if greater angle between the rear shock springs 7
is desired. The
brake bar 9 is made of 2 bars bolted together to act as one piece and extends
down over
support pipe 5 to the pedal below. It is pin connected to rear shock springs 7
on top and
over the support pipe 5 about 1/3 distance to brake pedal 45 with 5/16 bolts.
Another bar
with pedal can be attached to the bottom of brake bar, forcing the free end to
go into snow
as rider pushes on the second pedal. So the rider can snowplow by pushing one
pedal, or
push a bar into snow with other pedal.
FIG.16 - VERTICAL PIVOT BAR TO FRAME/SPRING AND SUPPORT PIPES CONNECTION
The vertical pivot bar 12 is made from 2 steel plates and 3 coupling adapters,
attached
to bicycle frame in the middle and support pipes at each end with 1/2" through
bolts. The
steel plates work as one piece and push one end up as the other moved down.
The
adapters are able to pivot about the connections permitting the support pipes
5 to also
move back and forth. This design provides flexibility of rear skis motion
while supporting
the rider. (Rear shock springs can be used instead of adapters, giving
smoother ride.)
FIG.17 - 2 HORIZONTAL PIVOT LEVERS TO FRAME AND SUPPORT PIPES CONNECTION
This 2 horizontal pivot bar 12 to frame 3 and support pipes 5 connection also
permits
the up/down motion of rear skis 10 while transmitting the load of rider to
skis. The pivot
bar 12 is 2 steel bars attached to frame 3 with 1/2" through bolt in the
middle and able to
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rotate about the bolt. The 3/4" support pipes 5 are also pin attached in
between the ends of
pivot bar 12 by a 5/16" bolt. This configuration forces one ski to go down as
other comes
up, allowing the 3-ski snow bike to lean. Since two support points are
required for snow bike
stability, two such connections are used along the support pipe 5.
FIG.18 - HORIZONTAL PIVOT BAR & SWINGING REAR SPRINGS TO FRAME AND SUPPORT
PIPES
This attachment of support pipes 5 to frame 3 is similar to the detail above
except for
the lower pivot bar 12 is substituted with the swinging rear spring shocks 7
connected to
frame through bolt on each side of frame also described before. This
configuration allows
the desired up/down motion of support pipes 5 and rear skis 10 while
supporting the load.
FIG.19 - BICYCLE REAR SPRING WITH PIVOR BAR SUPPORT
The rear bicycle spring 40 is also used to provide support of the rider. The
spring
remains connecter to frame as before. To the bottom of the spring, pivot bar
12 is attached
in the middle by 5/16" bolt such that it can pivot. It is 2 steel plates on
each side of rear
spring and supports connected together with 5/16" through bolt. The rear
support pipes 5
pin connected at each end, and transfers the load of rider directly to rear
skis. A turnbuckle
between rear supports keeps rear skis from sliding apart and adjusts width
between skis.
FIG.20 - REAR SKI ATTACHMENTS
The rear ski attachments 8 are shaped same as the bottom of ski boot, and
allow easy
snap in of most downhill skis 10 on the market, permitting the rider to choose
the ski length
and type desired. They are secured to the bottom end of the support pipe 5
with 2 bolts
such that it moves together with the support pipe as 1 piece, forcing the rear
ski to ride on
its edge during turns. The rear ski attachments 8 also have a "%"x 8" runners
24 on the inside
bottom to stabilize the forward motion of the ski-bike, and the top of the
attachment is
covered with a rough surface so the rider can stand on the attachments 8.
FIG.21 - REAR SUPPORTS FOR 3-SKI BIKE WITH REAR WHEEL
Because of the rear wheel 17, the back of the 3-ski bike is now supported by 2
solid rear
supports 18 that run from the rear skis attachments 9 upward to the rear of
the bike where
the rear wheel 17 connects. They are "1/2" galvanized pipes that connect to
support pipes on
the bottom and extend past the top of rear wheel 17, with series of 'A" holes
drilled at
midsection for adjustable connection to bicycle frame 3. The support pipes 5
and rear
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supports 18 are also pin connected allowing rear supports to swing. Bicycle
frame 3
connects to rear supports 18 with 1/2"x2" bolt 21, through one of height
adiustment holes at
midsection. A turnbuckle 19 on top holds the 2 rear supports 18 from sliding
out sideways,
and controls the distance between skis.
