U.S. patent application number 13/649903 was filed with the patent office on 2014-04-17 for multiple-auger curb forming and extruding apparatus.
The applicant listed for this patent is Paul G. McKinnon. Invention is credited to Paul G. McKinnon.
Application Number | 20140105683 13/649903 |
Document ID | / |
Family ID | 50475444 |
Filed Date | 2014-04-17 |
United States Patent
Application |
20140105683 |
Kind Code |
A1 |
McKinnon; Paul G. |
April 17, 2014 |
MULTIPLE-AUGER CURB FORMING AND EXTRUDING APPARATUS
Abstract
A manually operable and steerable curb extrusion device for
extruding curb, barrier, wall, gutter or the like from concrete,
cement or some other moldable building material. The curb extrusion
device has a segmented vibrating hopper into which building
materials are placed to fall onto a plurality of tapered counter
rotating vibrating augers which compact and force the building
material through an extrusion mold where it is shaped before
extrusion; the number of augers adjustable and selected to provide
the amount of building material required to be extruded.
Inventors: |
McKinnon; Paul G.; (Brigham
City, UT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
McKinnon; Paul G. |
Brigham City |
UT |
US |
|
|
Family ID: |
50475444 |
Appl. No.: |
13/649903 |
Filed: |
October 11, 2012 |
Current U.S.
Class: |
404/97 |
Current CPC
Class: |
E01C 19/4893
20130101 |
Class at
Publication: |
404/97 |
International
Class: |
E01C 19/48 20060101
E01C019/48 |
Claims
1. A manually maneuverable curb terming extruder propelled
apparatus for concrete, cementitious and plastic building materials
comprising: a. a chassis frame with walls defining a lower segment
of a feed hopper leading into a compaction chamber having a front
and rear with a rear opening which directs building material
rearward to propel the chassis frame forward, b. steering and
castering wheels attached to the chassis frame via swinging arms
which allow the wheels to he adjusted from side to side for manual
steering of the apparatus, c. an upper segment of the feed hopper
having a feed opening attached above the lower segment, of the feed
hopper structured to receive, hold, and gravity feed building
material into and through the lower segment of the feed hopper and
said feed hopper having a bottom outlet segment, d. a compaction
assembly in communication with the feed hopper defining a
compaction chamber with rear opening structured to accommodate a
variable number of spatially positioned juxtaposed removable
counter rotating augers positioned relative to one another In
vertical stackable and/or horizontal linear alignment at different
heights and widths depending on the cross-section of an extruded
curb to be formed, e. a variable number of a plurality of
juxtaposed removable counter rotating augers mounted within the
compaction, chamber, each having a decreasing tapered
cross-sectional diameter with each auger's largest cross-sectional
diameter positioned toward the front of the compaction chamber and
thereafter gradually decreasing toward the rear of the compaction
chamber and rotatably mounted to the chassis frame in communication
with, the bottom outlet segment of the hopper within the compaction
chamber such that front segments of the augers receive building
materials from die bottom outlet segment of the hopper and force
the building material rearward into and through the rear opening of
the compaction chamber, f. vibration means associated with the
counter rotating augers and the lower segment of the hopper such
that the augers and the lower segment of the hopper vibrate in
opposite directions, alternatively coming together and then
separating to drop the building material onto the augers for
continuous compaction and feed of said budding material, to prevent
bridging in the hopper and provide a more compacted building
material, g. a removable slip form with open forward and rearward
ends and an open bottom in communication with die compaction
chamber rear opening to receive and sectionally form the building
material into a continuous curb form, the number of augers selected
and positional to force building materials uniformly throughout
cross sections of slip forms for uniform filling, and h. a drive
motor associated with the rotating augers and vibration means to
vibrate and turn the augers.
2. A manually maneuverable curb form extruder propelled apparatus
according to claim 1, wherein the vibration means comprises an
eccentric dual stepping gear roller bearing with offset weight
system.
3. A manually maneuverable curb forming extruder propelled
apparatus according to claim 1, including leveling means associated
with the swinging arms to adjust the height and level of the
chassis frame.
4. A manually maneuverable curb forming extruder propelled
apparatus according to claim 1, wherein the drive motor includes a
gear box mounted to the lower segment of the hopper defined by the
chassis frame with an eccentric bearing mounting connection turning
the augers, while at the same time forcing the lower segment of the
hopper in opposition to the augers such that the augers and the
lower segment of the hopper vibrate in opposite directions.
5. A manually maneuverable curb forming extruder propelled
apparatus according to claim 1, including a rubber liner in the
hopper to flexibly seal the upper and lower segments of the
hopper.
6. A manually maneuverable curb forming extruder propelled
apparatus according to claim 1, including a flexible transition
member with sidewalls defining open ends mounted In communication
between the compaction chamber rear opening and the open forward
end of the slip form, wherein the sidewalls can expand and contract
to relieve stack up arid binding to provide a more even continuous
flow of building material for shaping through the slip form.
7. A manually maneuverable curb forming extruder propelled
apparatus according to claim 6, including a guide with an opening
mounted to the chassis frame beneath the compaction assembly and
structured to accommodate and travel along a reinforcing rod to
align the apparatus and form a finished curb about said reinforcing
rod.
8. A manually maneuverable curb forming extruder propelled
apparatus according to claim 1, wherein the slip form is
releaseably attached via a spring bar retainer.
9. A manually maneuverable curb forming extruder propelled
apparatus according to claim 1, inclining a rolling pattern member
mounted to the chassis frame and positioned after the open rearward
end of the slip form to impress a desired pattern finish onto the
surface of the formed finished curb.
10. A manually maneuverable curb forming apparatus comprising a
feed hopper having a lower segment defined by wails of a chassis
frame and an upper segment attached above the lower segment, the
feed hopper having a bottom outlet communicating with a compaction
assembly, the compaction assembly of variable dimensions to
accommodate two or more counter-rotating augers mounted in
differing positions to the chassis frame depending upon the cross
section of an extruded curb to be formed, and a compaction chamber
having a rear opening communicating with a removable slip form,
vibration means associated with the counter-rotating angers and the
teed hopper lower segment such that the angers and the lower
segment of the teed hopper vibrate in opposite directions, and a
drive motor associated with the augers and the vibration means to
vibrate and torn the augers.
11. A manually maneuverable curb forming apparatus according to
claim 10, wherein the vibration means comprises an eccentric dual
stepping gear roller bearing offset weight system.
Description
RELATED APPLICATIONS
[0001] This application is a continuation-in-part application of
Provisional Patent Application 61/627,574 filed Oct. 14, 2011
entitled "Multiple Auger Curb Forming and Extruding Device"
BACKGROUND OF THE INVENTION
[0002] 1. Field
[0003] This invention relates to concrete curb forming and
extruding apparatus. More particularly, it relates to a concrete
curb forming and extruding apparatus with 1) a frame with steering
castering wheels and adjustment locks, 2) a slip form forming the
curb cross-section with a straight-up side for getting close to
vertical surfaces, 3) an extruder having a variable capacity hopper
with a flexible liner, and 4) a plurality of augers rotating in
opposite directions beneath the hopper in varying orientations to
compact the concrete forcing it through the slip form via a
flexible member between the compaction chamber and the slip form to
isolate the vibration. The number of augers is variable and
selected to extrude the amount of material required to pass through
the slip form extrusion mold
[0004] 2. State of the Art
[0005] Present concrete curb forming and extruding machines have a
compaction member, such as a reciprocating ram or an auger to force
concrete material into a slip form forming a running curb. The
concrete material is usually of a dry consistency to hold the form
of the curb after being extruded from the machine. The dry
consistencies of the material cause it to bridge from side to side
in the hopper and not fall through into the compaction chamber. It
is common practice to have two men run the machine-one to steer and
control the machine while the other shovels small amounts of
material into and through the hopper.
[0006] The ram type of curb forming and extruding machines use a
gear box to reduce the speed with a crank arm connected to a flat
faced member, which is pushed by the crank through the compaction
chamber or housing displacing the curbing material through the slip
form to form the curb. May, U.S. Pat. No. 4,566,823 issued Jan. 28,
1986 is an example of a manually operable curb extrusion device
with interchangeable molds and compacting members wherein building
material is placed in a receiving hopper and falls into a
compacting chamber where a power driven and reciprocating
compacting member compacts the material into the extrusion mold
where it is shaped and extruded. The curb extrusion device is
manually directed or steered along the desired course via an
adjustable steering mechanism, and has a hopper with one straight
upright side, screw-on molds, and adjustable legs connected to the
wheels. Eggleton, U.S. Pat. No. 4,310,293 issued Jan. 12, 1982 is
another example of a ram driven concrete curb molding
apparatus.
[0007] Ram machines have been the most popular because of their
positive travel. However, straight compressive forces are not
conducive to better compaction. Varying sizes of particles resist
compaction and stack one against another, leaving voids or cavities
between the particles. Voids cause porous concrete with diminished
compressive test strengths. The ram of the ram curb-forming machine
also picks up some of the concrete material on the return
backstroke, which is then deposited as a trail of material down the
sides of the curb as waste. This slag has to be cleaned up or
pressed down out of sight and buried. Ram machines, as the speed of
the ram is increased, tend to jump ahead and then coast forward at
the end of the stroke, which pulls cracks in the top surface of the
curb. Loose parts on the machine, such as wheels, can also leave
marks in the extruded curb.
[0008] Auger type curb forming machines use an auger to move
material through a compaction chamber into the slip form, are not
as positive as the ram machines. They will not travel as
effectively up and down hills. The auger applies pressure for
compaction and forces material through the mold rearward, thereby
propelling the machine forward. If the material becomes captive and
turns with the auger, pressure is required to propel the machine.
The compacting chamber, thus filled, causes wear and power
consumption with little forward propulsion pressure being created.
McKinnon, U.S. Pat. No. 5,354,189 issued Oct. 11, 1994 discloses a
concrete curb forming and extruding apparatus with wheel adjustment
locks, a slip form for the curb cross-section, and a straight-up
side for getting close to vertical surfaces, with an extruder
having a hopper with a flexible liner, a dual augers rotating in
opposite directions to compact the concrete, and a flexible member
between the compaction chamber and the slip form to isolate the
vibration. This auger is very efficient, but has limited fixed
capacity for forming curbing so it is not capable of extruding
sidewalks, walls, and other larger jobs.
[0009] Smith, U.S. Pat. No. 3,137,220 issued Jun. 16, 1964
discloses a curb-laying machine with a number of oppositely
rotating augurs to extrude the concrete for forming curbs. Parrish
et al, U.S. Pat. No. 5,018,955 issued May 28, 1991 utilizes a
single auger to extrude the concrete and features a slip-on curb
form with various adjustment options.
[0010] Other examples of curb forming machines employing an auger
are: Bunn, U.S. Pat. No. 4,548,565 issued Oct. 22, 1985, Coho. Jr.
et al, U.S. Pat. No. 3,915,584 issued Oct. 12, 1975, W. E. Caufield
et al, U.S. Pat. No. 2,818,790 issued Jan. 7, 1958. None of these
devices avoids the augering captive material problem.
[0011] Cited for general interest are: Aparicio, U.S. Pat. No.
3,915,583 issued Oct. 28, 1975 disclosing a paving machine slip
form, Baucum. U.S. Pat. No. 4,298,293 issued Nov. 3, 1981
disclosing a dragline operated slip form curb forming machine, and
Leone, U.S. Pat. No. 4,984,932 issued Jan. 15, 1991 disclosing an
apparatus for continuous formation of concrete curbs via the
raising and lowering of the molding to form thresholds for
driveways, and intermediate tapering sections for transitions
between full height curbs and thresholds.
[0012] The present invention overcomes above problems and provides
an improved curb forming and extruding machine with a constant even
flow of material for a wide range of different jobs. It also has
variable capacity to not only form small jobs such as curbs, but
also larger jobs such as sidewalks, and walls having strong
compressive strength with a smooth finish by adjusting the number
of augers for a given job.
SUMMARY OF THE INVENTION
[0013] The present invention is directed to an improved manually
maneuverable curb forming extruder propelled apparatus to form
concrete, cementitious and other similar plastic building materials
into linear curbs, sidewalks, walls, and roadways. It comprises a
chassis frame and a dividable expandable/contractible hopper with
walls defining a dividable compaction chamber. The compaction
chamber has a rear opening through which is rearwardly directed the
formed building material; thereby depositing against the ground a
formed curb which simultaneously propels the apparatus forward. Two
steering and castering wheels are pivotally attached to both sides
of the front of the chassis frame via swinging arms which allow the
wheels to be adjusted from side to side for steering to avoid
obstacles in the path of the apparatus. Rear wheels are attached to
the back of the chassis frame to allow the apparatus to back up
without having to deal with pivoting wheels locking up and impeding
progress. Jack leveling means are generally associated with the
swinging arms to adjust the height and level of the chassis frame
so that the curb is formed to meet the needs of the user.
Preferably, quick releasing arm locks are associated with the
wheels to wedge the swinging arms into the desired position to
prevent play or looseness.
[0014] Part of the chassis frame defines the lower segment of the
dividable flexible hopper having a bottom outlet. An upper
vibrating segment of the flexible hopper is associated with the
lower segment, and has a feed opening structured to receive, hold,
and gravity feed building material into and through the bottom
outlet. The lower hopper segment is also dividable and surrounds a
building material compaction assembly sized to accommodate a set of
a plurality of counter rotating augers rotatably mounted to the
chassis frame to receive building material from the hopper and
force it rearward into and through the dividable compaction
chamber. The set of augers are removably mounted allowing them to
be removed as required for smaller jobs to provide the flow of
material required to pass through and fill a removable slip form
described below without creating voids.
[0015] Preferably the hopper has one straight up vertical side
above the compaction chamber making it easier for the operator to
see and get close to vertical surfaces next to the path of the new
curb. The hopper also includes a flexible rubber or plastic liner
in the hopper to flexibly seal the segments of the hopper and
prevent the cementitious building material from sticking in the
hopper. A vertical cross sectional partition fits within the hopper
and may be moved to reduce its capacity. This sectional partition
extends to the top of the building material compaction assembly
above the augers to direct building material only through the
number of augers required for a given job.
[0016] Vibration means are associated with the set of counter
rotating augers and the lower segment of the
expandable/contractible hopper such that the augers and the lower
segment of the hopper vibrate in opposite directions, thereby
alternatively squeezing and then separating to drop the building
material to continuously feed said building material into the
compaction chamber by the augers to prevent bridging in the hopper
and provide a more compacted building material. By vibrating the
augers and compaction chamber, a more compact material is provided
for producing a stronger concrete requiring less finishing because
of fewer voids. It also insures that the compaction chamber is
always filled, minimizing power consumption and maintaining
propulsion pressure.
[0017] Preferred vibration means constitute the eccentric gear of
an eccentric dual stepping gear roller bearing system, such as that
described in Ser. No. 12/804,286 filed Jul. 19, 2010 to
simultaneously drive and vibrate the auger drive shaft. This
eccentric dual stepping gear roller bearing system is not only
efficient, but provides a number of gearing ratios suitable for
different applications.
[0018] Also, a drier, better hydrated concrete material may be used
to better hold the form of the curb, sidewalk, wall, etc. after
being extruded from the machine. The number of men required to
operate the machine varies based on the size of the job. For
example, for smaller jobs using curbing machines with fewer augers
operated by one man once the hopper is filled. For larger jobs, the
number of men increases and usually involves one to steer and
control the machine, while the other shovels small amounts of
material into and through the hopper.
[0019] A removable slip form mold with open forward and rearward
ends and an open bottom is positioned in communication with the
compaction chamber rear opening to receive and sectionally form the
building material into a continuous curb, sidewalk or wall form.
Preferably, the slip form is releasably attached via a spring bar
retainer so that other interchangeable slip forms can be readily
inserted to provide a design and width of the desired
cross-section. Thus, a removable slip form is first selected
providing the cross-sectional of the curbing, sidewalk, or wall.
Then the number of augers is selected to provide the continuous
building material feed for filling the form, and any excess augers
removed from the set of augers. The sectional partition is then
moved in the hopper above the augers to only direct material from
the hopper onto the remaining augers of the set required for
continuously feeding the building material through the form.
[0020] Where a patterned or textured finish is desired, a rolling
pattern member may be mounted to the chassis frame and positioned
after the rear opening of the slip form to impress onto the surface
of the newly formed curb, sidewalk, wall, etc. a desired pattern
finish.
[0021] A drive motor, such as an electrical or internal combustion
engine, is operably associated with the rotating augers and
vibration means to vibrate and turn the augers. This is
accomplished by including with the drive motor a gear box mounted
to the chassis frame. The walls of the gear box are then structured
to form the lower segment of the hopper. An eccentric bearing is
mounted and connected to the augers via an input shaft geared to
run faster than the augers; thereby shaking the hopper housing in
opposition to the compaction assembly.
[0022] To relieve stack up and binding and provide a more even
continuous flow of the cementitious building material passing
through the slip form for shaping into a continuous curb, a
flexible transition member with open ends is mounted in
communication between the compaction chamber rear opening and the
forward opening of the slip form. This flexible member contracts
and expands to stabilize the pressure buildup in the apparatus;
thereby providing a more uniform pressure casting material to
provide better curb forming, thereby minimizing the loss of excess
slag extruded material while minimizing finishing time.
[0023] Where reinforcing bars or rods are required, a guide with an
opening sized to accommodate the rods is attached to the chassis
frame beneath the apparatus. In addition, the transition member is
generally formed of two hinged half sections of a pipe forming an
open slot directed toward the ground which passes over the rod or
rods; thereby forming a curb, walk or wall about the reinforcing
bars or rods.
[0024] The present invention therefore provides an efficient curb,
sidewalk, and wall forming machine for a wide variety of different
sized jobs, which minimizes waste, and provides exceptional
compacted concrete curbs, which require minimal finishing.
DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is a top view of a preferred embodiment of the
invention.
[0026] FIG. 2 is a side view of the preferred embodiment shown in
FIG. 1.
[0027] FIG. 3 is a cross section view of a removabl3e slip form
with aligned augers.
[0028] FIG. 4 is a side cross-sectional view of the embodiment
shown in FIG. 1.
[0029] FIG. 5 is a top view of the set of multiple augers of the
embodiment shown in FIG. 1.
[0030] FIG. 5 illustrates the manner in which the augers are
associated with a stepping gear drive.
[0031] FIG. 6 is a cross-sectional view of the stepping gear drive
shown in FIG. 5.
[0032] FIG. 7 is another cross-sectional view of the stepping gear
drive shown in FIG. 5.
[0033] FIG. 8 is another cross-sectional view of the stepping gear
drive shown in FIG. 5.
[0034] FIG. 9 is a cross-sectional view of a motor driven multiple
auger belt drive.
[0035] FIG. 10 is a top view of the auger drive gearing of the
embodiment shown in FIG. 9.
DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
[0036] FIG. 1 is a top view of a preferred embodiment of the
multiple auger curb forming and extruding apparatus invention 10. A
chassis frame 11 has a castering pair of steering wheels 12
pivotally attached to a wheel leg 13 and secured via a
position-locking pin 14 shown in FIG. 2. The pair of steering
wheels 12 is coupled together in alignment as shown in FIG. 5 with
one allowed to pivot additionally on the coupling to better aid in
steering. Thus the steering wheels 12 are better able to pivot more
freely to aid in steering for even larger jobs as the front end is
moved along the line of travel to lay a curb, sidewalk, or
wall.
[0037] A second castering pair of steering wheels 12a is also
pivotally attached to a castering wheel strut 15 and secured via a
second positioning locking pin 14a for said wheels 12a to support
and allow the curb forming and extruding apparatus to roll in
alignment to position the curb or sidewalk to be laid. This second
castering pair of steering wheels 12a may or may not have one wheel
12a allowed to pivot additionally on the coupling to better aid in
steering as usually only one pivoting castering pair with addition
pivoting motion is sufficient to provide the required mobility
guidance.
[0038] The steering wheels 12, 12a are elevated via jack cranks
(not shown) which operates a jack screw and jack screw nut operably
associated with the steering wheel struts 15, 15a with rear wheels
16, 16a to elevate the curb forming device 10 to the desired height
as shown in FIG. 2. Thus the direction of travel is usually in a
straight line, where the direction is controlled with two swiveling
castering pair of steering wheels 12, 12a used in combination with
two rigid rear wheels 16.
[0039] Associated with the steering wheel strut assemblies 15, 15a
is a steering handle (not shown) to assist an operator in
controlling and aligning the curb forming machine 10. Thus the
steering handle located on the end where the swivel casters are
located is used to guide the curb forming machine 10.
[0040] The chassis frame 11 defines the lower segment 11a of a
segment of a split hopper having an upper segment 11b operably
associated therewith. The upper segment 11b has a feed opening 18
held above the chassis frame 11 and structured to receive, hold,
and gravity feed building material through the lower segment 11a
having a bottom outlet 19. The lower hopper segment 11a surrounds
an expandable/contractible building material compaction chamber 20
sized to accommodate a variable number of a plurality of
interchangeable removable counter rotating augers 21 with tapered
ends 22 rotatably mounted to the chassis frame 11 to receive from
the hopper bottom outlet 18 and force the building material
rearward into and through the compaction chamber (not shown)
defined by the chassis frame 11. The compaction chamber 20 has a
rear opening 24 through which is rearwardly directed the formed
building material; thereby depositing against the ground the formed
curb which simultaneously propels apparatus 10 forward.
[0041] Preferably the hopper 11 has one straight up vertical side
above the compaction chamber 20 as shown in FIGS. 1 and 2 making it
easier to see to align and get close to vertical surfaces next to
the path of the new curb. The hopper 11 also includes a flexible
rubber or plastic liner (not shown) in the hopper to flexibly seal
the two segments 11a, 11b of the hopper 11 and prevent the
cementitious building material from sticking in the sides of the
hopper 11. The two segments 11a, 11b of the hopper 11 are held
together with flexible connections (not shown), which allow the
segments 11a, 11b to independently vibrate.
[0042] FIG. 3 is a cross section view of a removable slip form 31
with four aligned and two stacked augers 21 positioned to direct
cementitious materials through the entire cross section of the slip
form 31. The number and positioning of the augers 21 are thus
inserted and removed the compaction chamber 20 depending upon the
cross-section of the desired curbing shape defined by various slip
forms 31.
[0043] FIG. 4 a cross section view of another removable slip form
31 with three aligned and three stacked augers 21 positioned to
direct cementitious materials through the entire cross section of
this different shaped cross section. The auger 21 alignments is
thus varied to provide the right filling of the slip forms 31
mounted in association with the compaction chamber 20 rear opening
24.
[0044] The removable slip form mold 31 with open forward and
rearward ends and an open bottom is selected to provide the desired
cross sectional shape for different jobs and positioned in
communication with the compaction chamber rear opening 24 to
receive and sectionally form the building material into a
continuous curb, sidewalk, or wall form. Preferably, the slip form
31 has a button, which is releasably attached via a spring bar
retainer (not shown) so that other interchangeable slip forms 31
can be readily inserted to provide a curb design of the desired
cross-section. An eye (not shown) is removably attached to the
preloaded spring bar (not shown) to secure to a button (not shown)
on the form 31.
[0045] FIG. 5 illustrates the manner in which the augers 21 are
associated with a stepping gear drive 25, and rotation via linkage
26, which imparts vibration to better compact the building
materials as they are forced through the slip forms 31. The
differing cross sections of the stepping gear drive 25 are shown in
FIGS. 6, 7, and 8.
[0046] As shown in FIG. 9, the set of counter rotating augers 21
are belt 27 driven via a gear drive 28 with an eccentric stepping
gear drive 25 shown in Figs 5, 6, and 7 associated with the input
shaft 29 and a gasoline motor 30 attached to the chassis frame 11.
The motor 30 does not only drive the augers 21, but it
independently vibrates the augers 21 and lower segment 11a of the
hopper 11. This is accomplished using a gearbox drive 28 mounted to
the lower segment 11a of the hopper 11 defined by the chassis frame
11. An eccentric bearing mounting connection turns the augers 21,
while at the same time forcing the lower segment 11a of the hopper
housing in opposition to the augers 21 such that the augers and the
lower segment of the hopper vibrate in opposite directions.
[0047] The eccentric stepping gear drive 25 is mounted and
connected to the augers 21 via an input shaft 29 driven shown in
FIG. 10 by the motor 30. It is geared to run faster than the augers
21; thereby shaking the lower segment 11a of hopper 11 in
opposition to the compaction assembly 20.
[0048] To relieve stack up and binding and provide a more even
continuous flow of the cementitious building material passing
through the slip form 31, a flexible transition member (not shown)
with open ends is mounted in communication with between the
compaction chamber rear opening 24 and the forward opening of the
slip form 31. This flexible transition member contacts and expands
to stabilize the pressure buildup in the apparatus 10, as well as
isolates the vibration from the slip form 31.
[0049] The present invention 10 therefore provides a self-feeding
curb-forming machine, which smaller versions of which shown in FIG.
2 can be operated by one person for various sized jobs, and
provides a very compact extruded curb, which does not have excess
slag and requires minimal finishing.
[0050] Although the above description refers to the illustrated
embodiments, it is not intended to restrict the scope of the
appended claims. The claims themselves contain those features
deemed essential to the invention.
* * * * *