U.S. patent number 3,863,393 [Application Number 05/233,968] was granted by the patent office on 1975-02-04 for apparatus for supporting work means on vertically disposed surface.
This patent grant is currently assigned to Robert J. Nelson. Invention is credited to James R. Goff.
United States Patent |
3,863,393 |
Goff |
February 4, 1975 |
APPARATUS FOR SUPPORTING WORK MEANS ON VERTICALLY DISPOSED
SURFACE
Abstract
A support is disclosed which is adapted to be utilized in
conjuction with a vertically disposed surface and position a
working device with respect to the vertically disposed surface. The
support of the present invention provides for vertical and
horizontal movement as well as diagonal of the working device.
Advantageously, the support comprises a vertical support frame, a
working device, flexible vertical support members adapted to attach
the working device to the vertical support frame, and a flexible
track in contact with the working device and adapted to provide
contact of the working device with the vertically disposed
surface.
Inventors: |
Goff; James R. (Oklahoma City,
OK) |
Assignee: |
Nelson; Robert J. (Oklahoma
City, OK)
|
Family
ID: |
22879364 |
Appl.
No.: |
05/233,968 |
Filed: |
March 13, 1972 |
Current U.S.
Class: |
451/92; 212/313;
212/346; 212/179; 114/222; 118/305 |
Current CPC
Class: |
B24C
3/062 (20130101) |
Current International
Class: |
B24C
3/06 (20060101); B24C 3/00 (20060101); B24c
003/06 (); B24c 003/32 () |
Field of
Search: |
;51/8,9
;118/72,305,307,207,108 ;114/222,224 ;212/10 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Kelly; Donald G.
Attorney, Agent or Firm: Morton, Bernard, Brown, Roberts and
Sutherland
Claims
I claim:
1. A support apparatus adapted to be used in conjunction with a
vertically disposed surface comprising a vertical support frame
positioned above at least a portion of said vertically disposed
surface; at least one flexible vertical support member attached to
said vertical support frame; a depending means adapted to attach to
and supported by said flexible vertical support member;
ppositioning means extending from said depending means adapted to
contact said vertically disposed surface; and a flexible track
means extending in a horizontal direction which contacts said
vertically disposed surface at least at one location and which
contacts said depending means whereby the contacting of said
flexible track means forces said positioning means into contact
with said vertically disposed surface.
2. The support apparatus of claim 1 wherein a tensioning means is
provided in contact with said flexible track means and is adapted
to alter tension in said flexible track means.
3. The support apparatus of claim 2 wherein the tensioning means
comprises at least one outwardly extending arm positioned on said
blast head adapted to contact said flexible track means and an
engagement means positioned on said blast head which is adapted to
contact said flexible track means.
4. The support apparatus of claim 3 wherein two outwardly extending
arms are provided on said blast head and said engagement means is
positioned on said blast head between said outwardly extending
arms.
5. The support apparatus of claim 4 wherein the two outwardly
extending arms are pivotably mounted whereby tension is altered by
pivoting said outwardly extending arms.
6. The support apparatus of claim 4 wherein the engaging means
comprises two sheaves, at least one of which is adapted to be moved
with respect to the other whereby the movement of at least one of
said sheaves alters the tension in said flexible track means.
7. The support apparatus of claim 1 wherein said vertical support
frame is adapted to rest on a track means and said track means is
positioned above at least a portion of the vertically disposed
surface.
8. The support apparatus of claim 1 wherein said depending means
comprises a sprayer means.
9. The support apparatus of claim 1 wherein said depending means
comprises a blast head and a sprayer means which operates in
conjunction with said blast head.
10. The support apparatus of claim 1 wherein a tensioning means is
provided in contact with said flexible track means and is adapted
to alter tension in said flexible track means.
11. The support apparatus of claim 10 wherein the tensioning means
comprises at least one outwardly extending arm positioned on said
depending means adapted to contact said flexible track means and an
engagement means positioned on said depending means which is
adapted to contact said flexible track means.
12. The support apparatus of claim 11 wherein two outwardly
extending arms are provided on said depending means and said
engagement means is positioned on said depending means between said
outwardly extending arm.
13. The support apparatus of claim 12 wherein the two outwardly
extending arms are pivotably mounted whereby tension is altered by
pivoting said outwardly extending arm.
14. The support apparatus of claim 12 wherein the engaging means
comprises two sheaves, at least one of which is adapted to be moved
with respect to the other whereby the movement of at least one of
said sheaves alters the tension in said flexible track means.
15. The support apparatus of claim 1 wherein said vertical support
frame is adapted to rest on a track means and said track means is
positioned above at least a portion of the vertically disposed
surface.
16. A support apparatus to be used in conjunction with a vertically
disposed surface comprising a vertical support frame positioned
above at least a portion of said vertically disposed surface; at
least one flexible vertical support member attached to said
vertical support frame; a depending blast head adapted to attach to
and supported by said flexible vertical support member; positioning
means extending from said blast head adapted to contact said
vertically disposed surface; and a flexible track means extending
in a horizontal direction which contacts said blast head whereby
the contacting of said flexible track means forces said positioning
means into contact with said vertically disposed surface.
17. A support apparatus adapted to be used in conjunction with a
vertically disposed surface comprising a vertical support frame
positioned above at least a portion of said vertically disposed
surface; at least one flexible vertical support member attached to
said vertical support frame; a depending means adapted to attach to
and supported by said flexible vertical support member; a
tensioning means comprising at least one outwardly extending arm
positioned on said depending means adapted to contact a flexible
track means and an engagement means on said depending means which
is adapted to contact said flexible track means; and a positioning
means extending from said depending means adapted to contact said
vertically disposed surface, whereby the contacting of said
flexible track means with said tensioning means forces said
positioning means into contact with said vertically disposed
surface.
Description
The present invention relates to a support means, and in particular
to a support means adapted to position a work means in a contact
relationship with a vertically disposed surface. The support means
in conjunction with the work means enables vertical horizontal and
diagonal movement of the work means over the vertically disposed
surface. Advantageously, the support means is portable and can
easily be attached to and removed from the vertically disposed
surface.
The present invention provides an advantageous means for supporting
a work means, for instance, a spray head, a blast head, other
surface treating tool means, tool support means or a scaffolding
means, in a desired relationship to a vertically disposed surface.
By the novel apparatus it is possible to position the work means in
continuous relation with the vertically disposed surface or at a
desired distance from the vertically disposed surface. The support
means can be employed in conjunction with flat surfaces as well as
surfaces of variable or changing contour, e.g., vertical curvature
as well as horizontal curvature and convex as well as concave
curvature. Since the support means of the present invention enables
movement of the work means in a horizontal and vertical direction
over the vertically disposed surface, it is highly beneficial
where, for instance, a large vertical surface needs to be treated.
Minimal labor and time are required to set up this apparatus, and
hence, economic benefits can be achieved in employing the present
invention. Further, the apparatus of the present invention is
adapted to be vertically supported at the upper edge or top surface
of the vertically disposed surface. Thus, the support means can be
utilized over water, oil, rough land terrain and the like without
concern. As is seen, the apparatus of the present invention is
particularly useful in supporting surface treating tool means or
scaffolding required for the treatment of vertically disposed
surfaces such as the side walls of a ship's hull, large
conservation tanks for water, gas, petroleum or other fluids or
solids, walls, exteriors of buildings and the like.
Heretofore, the positioning of a work means with respect to large
vertical surfaces and at a desired distance therefrom has been
accomplished by the use of a frame means which is supported by the
terrain surrounding the vertically disposed surface. Such devices
are obviously cumbersome, require extensive manpower in
constructing and in operating, normally permits easy movement of
the work means solely in the vertical directon, and its use is
restricted by the surrounding terrain. Further, complicated
positioning means are required on such a frame means to locate the
work means at the desired location with respect to the vertically
disposed surface, particularly if the surface is contoured. Another
apparatus for supporting a work means employs vertically depending
flexible support members affixed to the upper portion of the
vertically disposed surface. While such an apparatus may allow
vertical movement of the work means, it is not satisfactory in many
circumstances in that horizontal movement is difficult, no means
are provided to position the work means at a desired location with
respect to the vertical surface, and satisfactory control over the
work means may be impossible due to the fact that the work means
may be affected by adverse environmental factors, for example,
wind.
The apparatus of the present invention is comprised of a vertical
support frame, a work means, flexible vertical support members
depending from the support frame and affixed to the work means, and
a flexible track means contacting the work means and adapted to
provide contact of the work means with the vertically disposed
surface. In more detail, the work means is preferably provided with
a positioning means adapted to contact the surface to locate the
work means with respect to the surface. The positioning means can
be casters, slides or the like to facilitate the movement of the
work means over the surface. Additionally, the work means can be
provided with a tensioning means which is adapted to contact the
track means in a manner such as to force the work means into
contact with the surface. Beneficially, the work means is
self-propelled; however, it is also possible to propel the
apparatus by other means.
The supporting means of the present invention is generally easily
adaptable to numerous uses and is thus broadly practical and
salable. The novel apparatus is economical to manufacture and
simply constructed yet sturdy and durable under extended use and
operates with relative freedom from wear. It is also possible to
adapt the support means and work means for remote control. Such
remote control adaptation need not be accompanied by extensive
sensing means for positioning the work means.
For a fuller understanding of the invention, reference should be
made to the following detailed description, taken in connection
with the accompanying drawings, in which:
FIG. 1 is a perspective view of a support means of the present
invention with a schematic representaton of a work means and with a
horizontal track means;
FIG. 2 is a side elevational view of a support means of the present
invention having a vertically positioned track means;
FIG. 3 is a top view of a schematic representation of a work means
provided with one type of tensioning means adaptable for engaging a
horizontal track means; and
FIG. 4 is a top view of a schematic representation of a work means
provided with another type of tensioning means adaptable for
engaging a horizontal track means.
With reference to FIG. 1, the apparatus of the present invention is
generally referred to as 10. A vertical support means 12 is
illustrated as comprising rigid frame members 14 which are adapted
to support themselves and work means 16 when positioned above or at
the upper edge of the vertically disposed surface. The frame means
12 is depicted as engaging track means 18 which is located adjacent
to the upper edge of the surface. Alternatively, the track means
can be attached to the vertically disposed surface or any other
surface above the vertically disposed surface. Desirably, the track
means provides support for the frame means for vertical forces,
e.g., to counteract gravity, and for a lateral force in a direction
perpendicular and away from the surface to counteract the torsional
forces to which the frame means is subjected. The track means upon
which frame means 12 rides may be, for example, a rail or a groove.
The rail can be rigid and in sections or somewhat flexible to
permit forming a track means which approximates the horizontal
contour of the vertically disposesd surface. The track means may be
permanently secured to a horizontal surface above and adjacent to
the vertically disposed surface or it may be detachable. Affixing
means suitable for enabling removal of track means 18 are, for
example, vacuum cups, magnets, clamps, or other fastening
devices.
Wheel means 20 are affixed to frame means 12 and are adapted to
contact track means 18. The wheel means are preferably designed
such that vertical forces and lateral forces developed by the frame
means are counteracted by the contact of wheel means 20 with the
track means. Beneficially, the wheel means are rotably mounted on
the frame means to enable the frame means to easily move in a
horizontal direction around a curved track. It may be desirable
under certain conditions to provide a safety lock means in
association with wheel means 20 to prevent disengagement of the
wheel means and the track means. A suitable safety lock means is,
for example, a latch means which is adapted to ride in a groove
located in the side of the track means and thus restrict vertical
movement of the wheel means with respect to the track. Rather than
a wheel means to engage track means 18, other contact means which
are preferably low in frictional contact, such as ball bearing
devices, slide runner devices, air cushion means adapted to support
the frame means by a cushion of air, etc.
The frame means is preferably adapted to contact track means 18 and
to contact the vertically disposed surface in order to provide
support for the work means. As depicted, wheel means 26 are
provided which are affixed to a lower rigid support member and
contact the vertically disposed surface. The wheel means reduce
friction of movement when the frame means moves or is moved in a
horizontal direction along the upper edge of the vertically
disposed surface. Instead of wheel means, other suitable means such
as ball bearing devices, slide runner devices and the like may be
employed.
Affixed to frame means 12 are pulley means 22 which are adapted to
receive flexible vertical support members 24. The flexible vertical
support members 24 depend from the frame means and are affixed to
work means 16. Preferably, the frame means is adapted to at least
partially receive the work means into its interior and thereby
enable the work means to reach or surpass the upper edge of the
vertical surface. Thus, pulley means 22 are desirably located to
the interior of the frame means on upper rigid support members 14,
and the frame means is free from rigid support members or the like
which would interfere with the upward movement of the work means.
Rather than providing pulley means 22 on frame means 12, other
means may be employed to affix the flexible vertical support
members. For instance, a winch means may be provided on the frame
means to receive the flexible vertical support members and, in
combination with a power source, be used to vary the depending
length of the support members, and hence, the vertical position of
the work means. On the other hand, a securing means may be employed
to attach the support member to the frame means. To obtain a
further mechnical advantage, a block and tackle arrangement may be
used.
Flexible vertical support member 24 can be, for example, a cable,
chain, band, flexible track or other suitable device. The vertical
support member is attached to work means 16. If a power means is
provided on the frame means for gathering and releasing flexible
vertical support means 24, the vertical support means may be
securely affixed to the work means. As depicted in the Figure, the
flexible, vertical support means is securely attached to work means
by affixing means 28. The flexible vertical support means extends
upward to and over pulley means 22, and downward to the work means
whereat the support means is affixed to winch means 30. Winch means
30 are preferably provided on both sides of work means 16 and are
desirably interconnected by rigid shaft means 32. The winch means
are powered by a hoist drive means 34 contained on work means 16.
Desirably the hoist drive means employed to activate the winch
means comprises a power source and a drive train means which is
provided with a self-braking gear drive. When, for instance, the
work means is a scaffold or other device where the winch means are
relatively widely separated, the rigid shaft means may be desirably
replaced with separate hoist drive means for each winch means.
Control of the separate hoist drive means may be manual control, or
the hoist drive means may be electrically interconnected to insure
equal response by each hoist drive means.
The movement of work means 16 over the vertically disposed surface
is facilitated by casters 36 which are mounted on the work means so
as to bear a significant amount of the force of contact of the work
means with the surface. The casters are rotably mounted and are
affixed to the work means by clamps 38. Clamps 38 permit the
casters to be positioned either a greater or lesser distance from
the work means, and the positioning can be done manually or
remotely. The casters can be positioned to control the attitude of
the work means. It is readily seen that by the use of casters, the
use of complex positioning mechanisms required when a frame means
is supported on the terrain surrounding the vertically disposed
surface is avoided. For many applications, the continual
readjustment of the casters is unnecessary to provide the desired
spatial relationship between the vertically disposed surface and
the work means. The casters are depicted as being in a lateral
position on the work means. Other placements of the casters can be
made; for instance, a set of three casters may be employed on the
work means in a triangular configuration. It is apparent that other
suitable devices may be employed in lieu of the casters. For
example, roller bearing devices, slide runner devices, air cushion
devices, etc. may advantageously be used. When, for example, a
spray head is supported by the apparatus of the present invention,
air cushion devices are beneficially employed to prevent contact of
the work means with the treated surface.
The apparatus of FIG. 1 is provided with horizontal track means 40
which contacts work means 16. The horizontal track means serves to
force the work means into contact with the vertically disposed
surface. In addition, the horizontal track means may be engaged and
employed to provide a friction contact or other essentially
non-slipping contact to enable the propulsion of the work means in
a horizontal direction. The horizontal track means can be, for
example, a cable, chain, band, rigid or flexible track, or other
suitable device. Forcing the contact of the work means and the
vertically disposed surface can be accomplished by providing a
means to shorten the track means. Such a means can be located away
from the work means and on the track means, for example, a
turnbuckle, or it can be located on the work means. For instance,
when a cable is used as the horizontal track means, tension can be
created by providing pulley means 42 which is stationarily
positioned away from the work means. Pulley means 44 is provided on
work means 16 and is adapted to be activated in a direction
essentially perpendicular to the surface. Activation means 46 is
employed to move pulley means 44. Suitable activation means are,
for instance, pneumatic or hydraulic cylinders or pneumatic or
hydraulic rotary actuators. Track means 48 is provided to guide
pulley means 44 in the desired direction and assist the support of
pulley means 44. Beneficially, pulley means 42 and pulley means 44
can be cable sheaves, each with three grooves. The cable can be
threaded on the side furthest from the surface of one sheave,
across to and around the second sheave and back to and around the
first sheave and across over the last groove of the second sheave.
By increasing the distance, in any desirable direction, between
pulley means 42 and pulley means 44, the tension in the cable can
be increased.
Another function which can be provided by pulley means 42 is to
engage with the horizontal track means to propel the work means in
a horizontal direction. The desired contact of the track means and
pulley means 42 can be obtained by several means. For instance,
increasing the tension in the track means may increase the
frictional contact sufficiently for the desired contact. A freely
rotable pulley can be provided which is adapted to be drawn towards
pulley means 42 in such a manner that the track means is forced
into contact with pulley means 42 to provide the desired contact.
In another mode, a chain and sprocket system may be used for the
horizontal track means and pulley 42 wherein rather than frictional
contact, linking contact is formed. A power source for pulley means
42 is located in motor housing 50.
Attached to the vertically disposed surface on opposing sides of
the work means are horizontal track securing means 52. The securing
means may be permanently attached to the surface or they may be
detachable. Attachment means include vacuum cups, magnets, clamps
and the like. Securing means 52 can be in the form of a grooved
track wherein the point of attachment of horizontal track means can
be quickly adjusted to the desired height. Clamp means 54 are
affixed to the horizontal track means and are adapted to ride in
the general track and be positioned at the desired location. Clamp
means 54 can be manually positioned, or they may be automatically
positioned. Rather than providing a grooved track means, a clamp
means can be directly affixed to the surface by, for example,
employing vacuum cups, magnets, clamps and the like. When the
vertically disposed surface is for example a cylindrical
conservation tank, a horizontal track means may be provided which
is an endless cable around the tank and contact the work means and
the tank. By tensioning the cable, the desired force can be exerted
upon the work means to provide its contact with the surface.
Securing means which fasten the cable to the tank may not be
required since the cable does not support the weight of the work
means and the work means can be adapted to support the weight of
the cable. A particularly advantageous means of increasing the
tension in such a cable is by the use of a means which attaches to
the end portions of the cable and draws in at least one end of the
cable until the circumference formed by the cable is the desired
distance to provide the desired tension. This means is operable on
tanks having diameters up to 110 feet or more.
FIG. 2 depicts another embodiment of the apparatus of the present
invention in which like members retain the same number. The support
means of FIG. 2 is suitable for primary movement of work means 16
in a vertical direction with means for horizontal movement. Track
means 56 is employed instead of horizontal track means 40 and
passes from frame means 12, over freely rotable pulley means 58
extending from work means 16, to track securing means 60. As shown,
track securing means 60 is attached to the vertically disposed
surface by means of a vacuum cup. Beneficially, a grooved track
means can be employed to receive a securing means which is affixed
to the track means so that the track means can be easily
positioned. By positioning the securing means automatically, the
horizontal movement of frame means 12, track means 56 and the
securing means can be coordinated.
Frame means 12 is adapted to have a means to receive track means
56. Affixed to an upper rigid member 14 is pulley means 62.
Desirably, track means 56 passes over pulley means 62 and around
pulley means 64 and back to pulley means 62. Pulley means 64 is
connected to tensioning means 66 affixed to frame means 12.
Tensioning means 66 can be, for example, pneumatic or hydraulic
cylinders, springs or the like, and serves to move pulley means 64
toward or from pulley means 62 thereby altering the length, and
hence tension, of track means 56 extending from the frame means to
track securing means 60.
Horizontal movement of the apparatus is effected by driving wheel
means 20 on the frame means with horizontal drive means 68. Another
means to effect horizontal movement is, for example, to provide a
drive wheel on work means 16 which contacts the surface with
sufficient frictional contact that movement can be imparted to the
apparatus. Wheel means 26 on frame means 12 may be provided with a
drive means to effect horizontal movement. Wheel means 20 rides on
track means 18. Track means 18 is illustrated as being detachable.
Track means 18 is mounted on track base 70 which can be segmented
so as to provide bridge sections over any irregularities which may
be present on the upper surface. The track base is freely
positioned on the upper surface and is connected to rigid member 72
which extends inwardly to a point where it is secured to the upper
surface. For instance, rigid member 72 can be securely affixed to
the upper surface by vacuum cup means 74. Vacuum cup means 74 has
vacuum line 76 exiting from it and provides the suction to hold the
vacuum cup to the surface. Other fastening means may also be used
such as magnets, clamps and the like. Rigid member 72, being in a
spaced away relationship from track base 70, assists in
counteracting lateral forces developed on the track means by reason
of frame means 12 and work means 16 suspended therefrom.
In another embodiment, rather than counteracting lateral forces by
a track means, a counter weight or other means can be provided on
frame means 12 to counteract the weight of the frame means and work
means supported therefrom. Thus, a fulcrum can be achieved at wheel
means 20. Beneficially, wheel means 20 can be adapted to ride
directly on the upper surface and a lateral support member can be
positioned between, for example, the upper rigid members of frame
means 12 and a point on the surface inward from the frame means. If
the vertically disposed surface forms a conservation tank or the
like with a circular cross-section, the point of contact can be the
center of the described circle and horizontal movement of the
apparatus in a horizontal direction around the tank can be around
the point of contact. The member from the fulcrum to frame means 12
counteracts the lateral force component working on the
apparatus.
FIG. 3 is a top view of schematic representation of a work means
having one type of tensioning means operable in the present
invention. Like members are designated the same in the figures. As
depicted, the work means is adapted to contact a concave surface.
Extending angularly, outwardly from the rear of work means 16 are
extension arms 78. Preferably, the extension arms are rigidly
affixed to work means 16. Brace means 80 is provided between the
extension arms to remove stress at the point of contact of the
extension arms and the work means. At the end of extension arms 78
are freely rotable pulley means 82. Horizontal track means 40
passes to the far side with respect to work means 16 of pulley
means 82 and then inwardly toward the work means to pulley means 44
and pulley means 42 and then to the far side of the other pulley
82. Pulley means 42 and pulley means 44 are adapted to alter
tension in horizontal track means 40. Pulley means 44 is positioned
on extension arm 84, which in turn is pivotally mounted on work
means 16. Tensioning means 86 is attached between extension arm 84
and pulley means 42 or the work means in order to move pulley means
closer or farther from pulley means 42. Horizontal track means 40
is desirably positioned around pulley means 42 and pulley means 44
such that an increase in distance between those pulley means will
increase the tension in the horizontal track means. For example,
horizontal track means 40 can be positioned on the inward side of
pulley means 44, passed around pulley means 42, back around pulley
means 44 and back to the inward side of pulley means 42 wherein the
pulley means are sheaves with three grooves. The tension in
horizontal track means 40 exerts a force on pulley means 82 which
is transmitted through extension arms 78 to work means 16 to put
work means 16 into contact with the vertically disposed
surface.
FIG. 4 illustrates another tensioning means similar to that of FIG.
3 except that extension arms 78 are probably fastened to work means
16 and tensioning means 88 are provided between extension arms 78
and work means 16 in such a manner that the extension arms can be
drawn closer or farther away from pulley means 42. By passing
horizontal track means 40 to the outward sides of pulley means 82
and to the inward side of pulley means 42, the tension in the track
means can be increased by drawing extension arms 78 closer to
pulley means 42. Rather than adapting both extension arms 78 with
separate tensioning means, one tensioning means can be adapted to
move both arms or one arm can remain stationary. Pulley means 42
and a pulley means 82 can be sheaves and the horizontal track means
may be utilized in the manner described in FIG. 3 to increase the
tension. The use of the sheaves permits a greater tensioning in the
track means to occur for the same relative movement between the
pulley means.
The work means can be, for instance, a platform for men, a paint
sprayer, a blast head, a sanding device, a scrubbing device, a blow
torch or the like. Particularly advantageous is the combination of
the supporting means of the present invention and a tool means
which requires a desired contact with a vertically disposed
surface. For example, a blast head of the type described in U.S.
Pat. No. 3,566,543, issued to Fogel, or my copending patent
application Ser. No. 229,842, filed Feb. 28, 1972, now U.S. Pat.
No. 3,788,010, provides a sealing means between the apparatus and
surface being treated in order to prevent the escape of dust, grit
or other particulate material to the atmosphere. In order to
provide a sufficient seal, a forced contact between the surface and
sealing means must be provided, otherwise, the ecological
advantages of this type of blast head may not be realized. The
present invention as hereinbefore described provides an
advantageous support system which provides the necessary force
required to obtain a desired seal. Another advantageous use of the
present invention is in association with a spray head. In order to
obtain a coating on surface which is uniform to prevent sparsely
coated sites which may lead to corrosion and to prevent heavily
painted sites and thus enhance economy of painting operations, it
is desirable to provide a means to position a spray head at a
uniform distance from the surface and to mechanically control the
movement of the spray head. The present invention provides a means
to enable a spray head to be positioned a uniform distance from the
surface by use of casters and the tensioning which forces the
casters into contact with the surface. Additionally, the spray head
can be adapted with a shield means which extends to the surface to
prevent the escape of the coating material and fumes, which often
have toxic properties and which may be flammable, to the
atmosphere.
Other modifications in the system of the present invention can be
made. For instance, a blast head can be positioned by the support
means to clean a surface. Immediately following, a spray head can
be adapted to be supported by the apparatus thus enabling the
cleaning and coating operations to operate in conjunction with each
other. By such a system, the coating of cleaned surface can
immediately be done to prevent recurrence of any corrosion.
* * * * *