WO1987007227A1 - Dispositif robotique rampant - Google Patents

Dispositif robotique rampant Download PDF

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Publication number
WO1987007227A1
WO1987007227A1 PCT/US1986/001102 US8601102W WO8707227A1 WO 1987007227 A1 WO1987007227 A1 WO 1987007227A1 US 8601102 W US8601102 W US 8601102W WO 8707227 A1 WO8707227 A1 WO 8707227A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
platform
housing
inner housing
robotic
Prior art date
Application number
PCT/US1986/001102
Other languages
English (en)
Inventor
Spencer D. Cottam
Original Assignee
Cottam Spencer D
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cottam Spencer D filed Critical Cottam Spencer D
Priority to US07/224,369 priority Critical patent/US4865140A/en
Priority to PCT/US1986/001102 priority patent/WO1987007227A1/fr
Priority to CA000536811A priority patent/CA1281349C/fr
Publication of WO1987007227A1 publication Critical patent/WO1987007227A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D57/00—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track
    • B62D57/02—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track with ground-engaging propulsion means, e.g. walking members
    • B62D57/024—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track with ground-engaging propulsion means, e.g. walking members specially adapted for moving on inclined or vertical surfaces

Definitions

  • This invention relates generally to robotic devices for accessing vertical and overhead surfaces. More specifically, the invention relates to such robotic devices that can carry other equipment such as surface cleaning devices.
  • Remote controlled robots are replacing workers in a number of industrial activities and thus reducing the risk of injury or death to the work force.
  • a robot that could carry equipment across a wide variety of vertical and overhead surfaces could be used for many industrial activities such as surface cleaning.
  • the robotic crawling device of the present invention can traverse vertical and overhead surfaces and comprises outer gripping means for gripping the surface, inner gripping means for gripping the surface, the inner gripping means being positioned within the outer gripping means, and crawling means for raising, advancing, and lowering the outer and inner gripping means in sequence.
  • the robotic crawling device further comprises a platform for mounting other devices. The platform is mounted to the crawling device such that the platform remains a substantially fixed distance from the surface.
  • the crawling device can be adapted to grip metal surfaces with electromagnets. Further, the crawling device can include a turning mechanism for changing the direction of movement across the surface.
  • Figure 1 is a top view of a preferred embodiment of the robotic crawling device of the present invention, the preferred embodiment using suction to grip the surface and having a platform for mounting other devices and a turning mechanism;
  • Figure 2 is a sectional view of the robotic crawling device of Figure 1 as indicated by line 2-2 on Figure 1;
  • Figure 3 is an enlarged view of the right end of Figure 2;
  • Figure 4 is a top view of the robotic crawling device of Figure 1 with the platform removed as shown by line 4-4 on Figure 2;
  • Figures 5A, 5B, 5C, 5D, and 5E present schematic representations of the crawling motion for the robotic crawling device of Figure 1;
  • Figure 6 is a sectional view of the robotic crawling device of Figure 1 as indicated by line 6-6 on Figure 1 and better shows the details of a preferred crawling mechanism;
  • Figures 7 and 8 are detailed views of components of the preferred crawling mechanism of Figure 6;
  • Figure 9 is a sectional view of a preferred mechanism for maintaining low pressure within the crawling device; and Figures 10A, 10B, IOC, 10D, and 10E present further schematic representations of the preferred crawling motion which correspond to Figures 5A, 5B, 5C, 5D, and 5E, respectively.
  • a platform 10 is provided for mounting other devices thereon (not shown), such as Applicant's surface cleaning device which is described in U.S. Patent No. 4,531,253 and is hereby incorporated by reference.
  • the attachment of the cleaning device or other equipment to the platform 10 may be by any conventional means such as bolts, or by welding.
  • the platform 10 is capable of traversing horizontal and vertical surfaces, including overhead surfaces, while the platform 10 remains a substantially fixed distance from the surface S as described below.
  • the platform 10 adheres to the surface S by suction and is connected to a suction source as described below.
  • a hole 12 in the platform 10 is provided for connection with the suction source.
  • suction to hold the platform 10 to the surface S allows use of the device with a variety of surfaces such as concrete or steel.
  • other mechanisms for holding the platform to the surface S can be used such as electromagnets (not shown) for gripping steel as further mentioned below.
  • the platform 10 is fastened by screws 14 or other fastening means to mounting blocks 16.
  • the mounting blocks 16 mount vertical shafts 18 which are pressed into holes 19 in the mounting blocks 16.
  • a mounting frame 20 slidably engages the vertical shafts 18 using linear bearings 22. Movement of the mounting frame 20 on the vertical shafts 18 is preferably limited by clamps 23 fastened to the free ends (lower ends as viewed in Fig. 2) of the vertical shafts 18.
  • Cam shafts 24 are rotatably mounted in bearings 25 (Fig. 4) with the mounting frame 20.
  • Football-shaped cams 26 are fixed to the cam shafts 24 using keyways and set screws or other fastening means (not shown) .
  • the football-shaped cams 26 are spaced from the mounting frame 20 by spacer sleeves 27 mounted on the shafts 24 on each side of the bearings 25 (Fig. 6).
  • the football-shaped cams 26 engage rollers 28 (Fig. 2) that are mounted with the mounting blocks 16.
  • the cam shafts 24 are rotated by a drive motor 30 (Figs. 2 and 4) which is mounted to the mounting frame 20 by a motor support 32.
  • the drive motor 30 has a drive shaft 34 (Fig. 4) that is in driving connection with the cam shafts 24 through a drive gearbox 36.
  • the gearbox 36 has a central chamber 38 that holds a plurality of gears that transfer power from the drive shaft 34 to the cam shafts 24.
  • the rollers 28 ride upon the rotating football-shaped cams 26.
  • the football-shaped cams 26 and cam shafts 24 move toward and away from the surface S (Fig. 2), but the shape of the football-shaped cams 26 causes the rollers 28 and the platform 10 to remain a substantially fixed distance from the surface.
  • inner circular cams 40 are eccentrically mounted to the cam shafts 24 outside the football cams 26 by keyways and set screws or other fastening means (not shown) .
  • the inner circular cams 40 are rotatably mounted in bearings 44 within inner support brackets 42.
  • the inner support brackets 42 are attached by screws or other fastening means (not shown) to an inner housing 46.
  • the inner housing 46 preferably includes a turning mechanism as described below. With the turning mechanism, the inner housing 46 is indirectly connected to an inner annular seal 48 which engages the surface S when the inner housing 46 is pressed against the surface S as described below.
  • Outer circular cams 50 (Fig.
  • the outer cams 50 are similar to the inner cams 40 except that the outer cams 50 are offset on the shafts 24, 180 degrees with respect to the inner cams 40 when fixed to the cam shafts 24 (compare Figs. 7 and 8).
  • the outer cams 50 are rotatably mounted in bearings 54 within outer support brackets 52.
  • the outer support brackets 52 are fastened by screws or other fastening means (not shown) to an outer housing 56 (Fig. 6).
  • the outer housing 56 is connected to an outer annular seal 58 which engages the surface S when the outer housing 56 is pressed against the surface S, as described below.
  • the outer housing 56 is connected to a housing body 60 by screws 62 or other fastening means.
  • the housing body 60 is connected to a housing body retaining ring 64 by screws 66 or other fastening means.
  • the function of the retaining ring 64 is described in more detail below.
  • the outer annular seal 58 is fixed to the retaining ring 64 by glue or other suitable known fastening means.
  • the outer seal 58 can be fixed to a removable ring (not shown) which can be fastened to the retaining ring 64 by screws or other fastening means for easy replacement of the outer seal 58.
  • An upper chamber U (Figs. 3 and 5A) is formed within the outer housing 56 by connecting the outer housing 56 to the platform 10 and to the inner housing 46 by flexible annular diaphragms 70 and 80, respectively.
  • a first flexible annular diaphragm 70 is connected to the outer housing 56 with an outer housing retaining ring 72 using screws 62, and is further connected to the platform 10 by a platform retaining ring 74 using screws 76 or other fastening means.
  • An annular notch 78 in the outer housing 56 allows movement of the flexible annular diaphragm 70 as the outer housing 56 moves relative to the platform 10 as described below.
  • the outer housing body 60 and the outer housing retaining ring 64 hold a second flexible annular diaphragm 80 which is connected to the inner housing 46 by an inner housing retaining ring 81 using screws 82 or other fastening means.
  • the second flexible annular diaphragm 80 splits the interior of the outer housing 56 into the upper chamber U, which is substantially disposed between the platform 10 and the inner housing 46, and an annular chamber A (see Figs. 3 and 10A), which is substantially disposed between the inner annular seal 48 and the outer annular seal 58.
  • the preferred embodiment of the invention includes a turning mechanism as part of the inner housing 46.
  • a ring gear 84 rotatably engages the inner housing 46 by sliding within a teflon ring bearing 86 which is mounted between the ring gear 84 and the inner retaining ring 81.
  • the ring gear 84 is held in place by friction, and rotates within the inner housing retaining ring 81.
  • An O-ring 87 (Fig. 3) is mounted between the retaining ring 81 and the ring gear 84 to minimize leakage for reasons that are more apparent below.
  • the ring gear 84 is further retained by a cover plate 88 which is connected to the inner housing 46 by a screw 89 (Fig. 2) or other fastening means.
  • a pinion gear 90 is rotatably mounted between the inner housing 46 and the cover plate 88 and engages the ring gear 84.
  • the pinion gear 90 is fixed to a shaft 92 which is rotatably mounted on the inner housing 46.
  • a conventional turning motor 94 and a turning gear box 96 are mounted on the inner housing 46 to rotate the pinion gear 90.
  • Rotation of the pinion gear 90 causes the inner housing 46 to rotate relative to the ring gear 84 and is capable of changing the direction of travel or lateral movement of the inner housing 46 when the ring gear 84 is in contact with the surface through the inner annular seal 48.
  • the inner seal 48 is fixed to the ring gear 84 by glue or other fastening means.
  • the inner seal 48 can be fixed to a removable ring (not shown) which can be fastened to the ring gear 84 by screws or other fastening means for easy replacement of the inner seal 48.
  • An inner chamber I (Figs. 2 and 10A) is formed by and contained within the inner housing 46 when the inner annular seal 48 is in contact with the surface S.
  • the inner chamber I is in fluid communication with the upper chamber U, through holes 47 (Fig. 2) in the inner housing 46 if necessary, so that suction applied to either the inner chamber I or the upper chamber U reduces the pressure within both chambers.
  • the inner chamber I and upper chamber U are not in fluid communication with the annular chamber A when the inner seal 48 is in contact with the surfaces (as shown in Figures 10A, 10C, 10D and 10E) although there may be some leakage therebetween, as explained below. All three chambers A, U, and I are in fluid communication when the inner seal 48 is raised from the surface (as shown in Figure 10B).
  • the source of suction is preferably in direct fluid communication with the inner chamber I.
  • a hole 100 in the inner housing 46 mounts a hose fitting 102 which is secured to the inner housing 46 by screws 104 or other fastening means.
  • a short tube 106 is connected to the hose fitting 102 between the inner housing 46 and the cover plate 88. The short tube 106 terminates above a hole 108 in the cover plate 88.
  • a second hose fitting 110 is mounted in the hole 12 in the platform 10 using screws 112 or other fastening means.
  • a flexible suction hose 114 is fastened between the first and second hose fittings 102 and 110 by clamps or other fastening means. Attachment of the suction source to the inner chamber I is preferred because water and other foreign substances on the surface S are drawn into the suction source without passing through the upper chamber U which contains most of the mechanical parts.
  • the suction source is preferably of a sufficient capacity to adhere the platform 10 to a porous surface such as concrete by lowering the pressure in the upper and inner chambers U and I relative to the pressure which is acting externally of the apparatus.
  • the suction source must also lower the pressure in the annular chamber A each time the outer housing 56 is lowered to the surface S and the inner housing 46 is raised from the surface S.
  • a suitable suction source is shown in Figure 9.
  • a short pipe 116 is threaded or otherwise fastened to the hole 12 in the platform 10 and mounts a venturi valve 118.
  • the venturi valve 118 preferably has multiple venturi restrictions for creating suction within the pipe 116 when a fluid, such as air, from a fluid source 120, such as an air compressor, is passed through the venturi valve 118.
  • the suction source reduces the pressure within the suction hose 114 which reduces the pressure or creates a partial vacuum in the inner chamber I between the surface and the cover plate 88.
  • a second hole 130 in the cover plate 88 helps to reduce the pressure between the cover plate 88 and the inner housing 46 so that the pressure is quickly reduced within the inner chamber I.
  • a filter 132 is mounted over the hole 130 in the cover plate 88 to prevent particles from passing through the hole 130 when the source of suction is shut off.
  • the inner annular seal 48 and the outer annular seal 58 When used on a porous surface, the inner annular seal 48 and the outer annular seal 58 will not prevent leakage. However, leakage around the seals 48 and 58 may assist in raising the inner housing 46 and the outer housing 56 by helping to equalize the pressure on both sides of each seal as it is raised. If the inner seal 48 and the outer seal 58 are used on a surface that does not allow sufficient leakage around the seals to the point that the seals are difficult to raise, compressible vents 148 and 158 (Figs. 2 and 6) in the seals 48 and 58, respectively, provide adequate leakage. The compressible vents 148 and 158 are preferably small horizontal slots in the seals 48 and 58.
  • vents 148 and 158 are closed when the seals 48 and 58 are pressed against the surface as described below and opened to equalize the pressure on both sides of the seals as the force pressing against each seal is relieved as described below.
  • the device can be provided with other mechanisms for equalizing the pressure on both sides of each seal 48 and 58.
  • the fluid source 120 and venturi valve 118 create a low pressure or partial vacuum in the pipe 116 which in turn creates a low pressure in the upper chamber U and the inner chamber I so that atmospheric pressure acts on the platform 10 to hold it or move it toward the surface S.
  • the platform 10 pushes the cam shafts 24 toward the surface S through the rollers 28 and the football-shaped cams 26.
  • the cam shafts 24 are positioned relative to the surface S by the inner housing 46 or the outer housing 56 through the inner cams 40 and the inner support brackets 42 or the outer cams 50 and the outer support brackets 52, respectively. As shown by Figs. 5A-E and Figs.
  • rotation of the cam shafts 24 by the drive motor 30 causes the cam shafts 24 to shift the atmospheric force applied on the platform 10 between the inner housing 46 and the outer housing 56 as the inner cams 40 and the outer cams 50 sequentially raise and lower the inner housing 46 and the outer housing 56.
  • the inner cams 40 and the outer cams 50 also advance the inner housing 46 and the outer housing 56, respectively, as each housing is raised and lowered.
  • the inner housing 46 and the outer housing 56 move across the surface with a crawling motion whereby the housings 46 and 56 are sequentially raised, advanced, and lowered.
  • FIGs. 5A, 5B, 5C, 5D, 5E, 10A, 10B, IOC, 10D, and 10E both the inner annular seal 48 and the outer annular seal 58 are in contact with the surface S and a low pressure exists in the upper chamber U, the inner chamber I, and the annular chamber A.
  • the outer housing 56 has been advanced to the left with respect to the inner housing 46 and the outer cams 50 and the inner cams 40 are in the relative positions shown in Fig. 5A.
  • Figs. 5B and 10B the cam shafts 24 have been rotated ninety degrees (counterclockwise).
  • the rotation of the cam shafts 24 causes the outer cams 50 and the inner cams 40 to rotate within the outer support brackets 52 and the inner support brackets 42, respectively.
  • the outer support brackets 52 remain in a fixed position due to contact with the surface S and the counterclockwise rotation of the outer cams 50 and the inner cams 40 raises and advances the inner housing 46 and the inner annular seal 48 to the position shown in Fig. 10B.
  • the movement of the inner cams 40 and the outer cams 50 raises the cam shafts 24 with respect to the surface S; however, the rotation of the football-shaped cams 26 by the cam shafts 24 allows the platform 10 to remain a substantially fixed distance from the surface S.
  • the low pressure remains in the upper chamber U, the inner chamber I, and the annular chamber A for the position of the device shown in Fig. 10B.
  • the cam shafts 24 are further rotated ninety degrees (counterclockwise) from the position shown in Fig. 5B, which causes further rotation of the outer cams 50 and the inner cams 40 in the outer support brackets 52 and the inner support brackets 42, respectively.
  • the inner cams 40 and the inner annular seal 48 move to the left from the position shown in Fig. 5B to the position shown in Fig. 5C.
  • the movement of the inner cams 40 lowers and advances the inner housing 46 until the inner annular seal 48 again contacts the surface S as shown in Fig. IOC.
  • the counterclockwise rotation of the inner cams 40 within the inner support brackets 42 causes the outer cams 50 to move from the position shown in Fig. 5C to the position shown in Fig. 5D.
  • the movement of the outer cams 50 raises and advances the outer housing 56 and the outer annular ring 58 from the position shown in Fig. 10C to the position shown in Fig. 10D.
  • the movement of the inner cams 40 and the outer cams 50 raises the cam shafts 24 with respect to the surface S; however, the rotation of the football-shaped cams 26 by the cam shafts 24 allows the platform 10 to remain a substantially fixed distance from the surface S.
  • a low pressure remains in the upper chamber U and the inner chamber I although the raising of the outer annular seal 58 raises the pressure in the annular chamber A.
  • the cam shafts 24 are further rotated ninety degrees (counterclockwise) from the position shown in Fig. 5D, causing the outer cams 50 and the inner cams 40 to further rotate within the outer support brackets 52 and the inner support brackets 42, respectively.
  • the inner support brackets 42 remain in a fixed position due to contact with the surface S.
  • the counterclockwise rotation of the inner cams 40 moves the outer cams 50 from the position shown in Fig. 5D to the position shown in Fig. 5E which is the same as the starting position, Fig. 5A.
  • the movement of the outer cams 50 lowers and advances the outer housing 56 until, the outer annular seal 58 contacts the surface S.
  • the movement of the inner cams 40 and the outer cams 50 lowers the cam shafts 24 with respect to the surface S; however, rotation of the football-shaped cams 26 by the cam shafts 24 causes the platform 10 to remain a substantially fixed distance from the surface S.
  • the low pressure remains in the upper chamber U and the inner chamber I.
  • a switch (not shown) to the turning motor 94 is turned on or activated so as to cause the motor 94 to change the direction of travel by rotating the inner housing 46 about the ring gear 84.
  • the switch is turned off to deactivate the motor 94.
  • the illustrated embodiment of the device will turn only while the inner annular seal 48 grips the surface S and the - -
  • a circuit control mechanism (not shown) for controlling the turning motor 94 can be used to prevent excessive wear on the turning motor 94 which might otherwise occur if the motor is operated when both the inner and outer seals 48 and 58 are gripping the surface S.
  • the illustrated device When used with a metal surface, the illustrated device can be easily converted from suction gripping to magnetic gripping by replacing the inner seal 48 and the outer seal 58 with inner and outer electromagnetic rings having substantially the same shape as the seals. The electromagnetic rings would then be sequentially energized to sequentially hold the cam shafts 24 to the surface through the inner housing 46 and the outer housing 56. Springs (not shown) could be mounted on the vertical shafts 18 between the mounting frame 20 and the clamps 23, or between the mounting frame 20 and the mounting blocks 16, to hold the rollers 28 against the football-shaped cams 26.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)

Abstract

Dispositif robotique rampant capable de parcourir des surfaces verticales et aériennes tout en portant d'autres équipements. Le dispositif comporte de préférence une plate-forme (10) qui demeure à une distance sensiblement fixe de la surface. Cette plate-forme (10) surmonte un mécanisme rampant comportant un logement extérieur (56) à l'intérieur duquel est positionné un logement intérieur. Un mécanisme de rotation peut être incorporé au logement intérieur (46) afin de permettre l'avancement du dispositif dans n'importe quelle direction.
PCT/US1986/001102 1986-05-19 1986-05-19 Dispositif robotique rampant WO1987007227A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US07/224,369 US4865140A (en) 1986-05-19 1986-05-19 Robotic crawling device
PCT/US1986/001102 WO1987007227A1 (fr) 1986-05-19 1986-05-19 Dispositif robotique rampant
CA000536811A CA1281349C (fr) 1986-05-19 1987-05-12 Dispositif robotique rampant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1986/001102 WO1987007227A1 (fr) 1986-05-19 1986-05-19 Dispositif robotique rampant

Publications (1)

Publication Number Publication Date
WO1987007227A1 true WO1987007227A1 (fr) 1987-12-03

Family

ID=22195512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1986/001102 WO1987007227A1 (fr) 1986-05-19 1986-05-19 Dispositif robotique rampant

Country Status (2)

Country Link
CA (1) CA1281349C (fr)
WO (1) WO1987007227A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115123417A (zh) * 2022-06-22 2022-09-30 国网天津市电力公司建设分公司 一种面向电力铁塔的机器人攀爬夹持机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777834A (en) * 1969-05-16 1973-12-11 Hitachi Metals Ltd Magnet vehicle
US4029164A (en) * 1974-12-28 1977-06-14 Sanko Co., Ltd. Movable apparatus adhering to the surface of a wall
US4330865A (en) * 1979-07-25 1982-05-18 Nuclear Power Company Limited Non-destructive test apparatus
US4333259A (en) * 1980-11-13 1982-06-08 Chen Te-Son Wall-clambering toy space bug
US4345658A (en) * 1978-09-29 1982-08-24 Commissariat A L'energie Atomique Vehicle able to move by adhesion on a random surface

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777834A (en) * 1969-05-16 1973-12-11 Hitachi Metals Ltd Magnet vehicle
US4029164A (en) * 1974-12-28 1977-06-14 Sanko Co., Ltd. Movable apparatus adhering to the surface of a wall
US4345658A (en) * 1978-09-29 1982-08-24 Commissariat A L'energie Atomique Vehicle able to move by adhesion on a random surface
US4330865A (en) * 1979-07-25 1982-05-18 Nuclear Power Company Limited Non-destructive test apparatus
US4333259A (en) * 1980-11-13 1982-06-08 Chen Te-Son Wall-clambering toy space bug

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115123417A (zh) * 2022-06-22 2022-09-30 国网天津市电力公司建设分公司 一种面向电力铁塔的机器人攀爬夹持机构
CN115123417B (zh) * 2022-06-22 2024-03-15 国网天津市电力公司建设分公司 一种面向电力铁塔的机器人攀爬夹持机构

Also Published As

Publication number Publication date
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