[go: up one dir, main page]

US2733817A - Foldable hoist - Google Patents

Foldable hoist Download PDF

Info

Publication number
US2733817A
US2733817A US2733817DA US2733817A US 2733817 A US2733817 A US 2733817A US 2733817D A US2733817D A US 2733817DA US 2733817 A US2733817 A US 2733817A
Authority
US
United States
Prior art keywords
boom
supporting frame
foldable
windlass
hoist
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
Publication date
Application granted granted Critical
Publication of US2733817A publication Critical patent/US2733817A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/20—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes with supporting couples provided by walls of buildings or like structures
    • B66C23/202—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes with supporting couples provided by walls of buildings or like structures with supporting couples provided from below, e.g. by floors of buildings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/06—Cranes in which the lifting movement is done with a hydraulically controlled plunger

Definitions

  • My invention relates to a foldable hoist and has as its prime object the provision of a foldable hoist having a boom which is swingable from one side of its supporting structure to a horizontal or nested position on the other side of the supporting structure and wherein the supporting structure for the boom is swingable vto a4 horizontal or nested position opposite from that of the boom.
  • reference character 1 designates a V-shaped boom comprising members 2 and 3 converging at one end and diverginglat the opposite end of the boom.
  • the diverging ends of members 2 and 3 are pivotally connected at 4 to a base plate 5 which is shown secured to foundation 6.
  • a supporting frame 7 which is secured in a normal operating position by brace members 8 which ice are pivotally connected to foundation 6 and to opposite sides 9 and 10 of supporting frame 7.
  • Boom 1 is swingable about its pivotal axis from one side of supporting frame 7 in its normal operating position over and about the supporting frame to a horizontal position; onits other side.
  • Supporting frame 7 has a windlass 51 mounted thereon for raising and ⁇ lowering the boom, whichwindlass ⁇ comprises a drum 20 rotatably mounted in frame 7, a gear wheel 21 operatively connectedto drum 20, and a worm gear 22 positioned for coaction with gear wheel 21.
  • the windlass is connected with boom 1 by suitable .block and tackle gear comprising a line 23 which is secured to drum 20, a block pulley 24 pivotally connected at 25 to a triangular shaped plate 26 which is pivotally mounted at the diverging ends of boom ⁇ 1, and a block pulley 27 which is pivotally connected to members 28 which in turn are pivotally connected toopposite members 9 and 10 of frame 7.
  • Line 23 extends from-drumli) over block pulley 20 is rotated in a counterclockwise ⁇ direction'.
  • ing structure for the boom both of which are pivotally p axis with the boom in its nested position from the normalV operating position to a Vhorizontal Aposition opposite from that Vof the boom.
  • Suitable mechanism is provided for operating the boom and for raising ⁇ and lowering any load carried by the boom. This mechanism is adapted for operation by a portable hand tool and incorpo-rates a worm and gear wheel drive for holding the mechanism against the weight of the boom and any load carried b the boom with the power removed.
  • Fig. l is a perspective View of the foldable hoist showing the boom being raised on one side of the supporting structure.
  • Fig. 2 is a perspective view of the foldable hoist with the boom being lowered on the other side of the supporting structure.
  • Fig. 3 is a perspective view of the foldable hoist with the boom in its nested position and with a supporting structure being lowered into a horizontal position opposite from the boom.
  • Figs. 4 through 9 are side elevational views of the foldable hoist showing the boom in progressive stages of its operation from one side of the supporting structure to a nested position on the other side and showing the supporting structure being operated to its horizontal position with the boom in its nested position.
  • Fig. l0 is a top plan view of the boom and supporting structure in their horizontal positions with the block and tackle gear removed.
  • Boom 1 is raised by rotating drum 20 in a elockwiseidirection as viewed in Figs. 4 through 9 and is lowered when drum Worm gear 22 is provided with a male fitting 29 which is adapted to rotate the worm gear.
  • the aforesaid windlass for controlling boom 1 mayI be operated by portable drill 30 having a recessed fitting 31 secured' thereon suitable for engaging male fitting 29.
  • Portable drill 30 should be provided with a reversible motor so that it may be operated in onev direction to raise boom 1 and operated in'the opposite direction to lower boom 1.
  • ⁇ Portable drill 30 may be of the pneumatic type as shown in the drawings ,Y in which eventAv it will be connected by a suitable air hose 32 to a source of compressed air.
  • Supporting frame 7 is provided with another windlass 52 comprising drum 42, gear wheel 43, andvworm gear 44.
  • Drum 42 has a line 45 wound thereon which line ⁇ extends over a pulley 46 which is pivotally mounted at 50 upon triangular plate 26.
  • Line 45 is provided at the end thereof with theusual type of lifting hook 47.
  • Worm gear 44 is provided with a male fitting 48 which is adapted for engagement by the recessed tting 31 secured upon portable drill't), thus enabling portable drill 30 to operate both windlasses.
  • boom 1 When drum 42 is moved in a counterclockwise direction, hook 47 and anyV load to which it might be attached is moved downwardly.
  • boom 1 When boom 1 is moved from one side as viewed in Figs. 4 and 5 of supporting frame 7 to its other side as viewed in Figs. 6 and 7 with boom 1 from the one side of supporting frame 7 to its other side, the hook and load remaining in a vertical position at all times.
  • Windlass 52 is of course operable with the boom on its other side to raise and lower lifting hook 47.
  • Boom 1 may have a plurality of encaged floodlights 48 secured at its converging ends which are directed in the direction of hook 47. Floodlights 48 are connected in the usual manner through suitable conduits encased within members 2 and 3 to pigtails 49.
  • supporting frame 7 is pivotally connected at 4 to base plate 5 which is secured upon machine shop floor 6. It has also been noted that supporting frame 7 is secured in a normal operating position by brace members 8 which are connected both to the supporting frame and to foundation 6. When boom 1 is operated to a horizontal position on its other side (Fig. 8), brace members 8 are disconnected from supporting frame 7 to permit supporting frame 7 to be pivoted to the left as viewed in Fig. 8.
  • supporting frame 7 is capable only of being pivoted in one direction, namely to the left as viewed in Fig. 8, the lower end of supporting frame 7 being especially formed for this purpose.
  • the lower end of frame 7 accordingly has a rounded end formed on one side and a square end on its other side.
  • drum 20 of windlass 51 is rotated in a counterclockwise direction as viewed in Fig. 8 after boom 1 has attained its horizontal or nested position, supporting frame 7 is caused to pivot in a counterclockwise direction as viewed in Fig. 8 until it attains a horizontal position opposite from that of boom 1 (Fig. 9).
  • Boom 1 is of sufficient weight to permit the supporting frame 7 to be lowered from its normal operating position to its horizontaloperating position without moving boom 1 from its nested position.
  • a foldable hoist having a boom and supporting structure for the boom and wherein the boom may be operated from one side of the supporting structure to a horizontal or nested position ⁇ on the other side of the supporting structure and wherein the supporting structure may be operated to a horizontal position opposite from the boom after the boom has attained its nested position.
  • my foldable hoist may be operated by a small portable drill or even by a hand crank from a single location and by one man, and that because of the worm and gear wheel driving mechanism incorporated into each windlass both the boom and any load carried thereby will be maintained in the ⁇ positions to which they have been operated until intentionally moved therefrom.
  • a foldable hoist the combination of a base, a boom comprising spaced members, a supporting frame for the boom pivotally mounted at one end on the base between said spaced members of the hoorn, ⁇ means separably connected to the supporting frame for securing the supporting frame in a normal vertical operating position, the boom members being pivotally mounted at one end on said base and the boom being swingable about its pivotal axis from a hoisting position at one side of the supporting frame about and over the supporting frame to a horizontal position on the opposite side of the frame, the supporting frame being swingable about its pivotal axis from its vertical normal yoperating position to a horizontal position opposite to the boom when the latter is horizontal, a windlass mounted on said supporting frame, and gear including a cable and pulleys connecting the windlass to the boom for raising and lowering the boom while the boom is at either side of the vertical supporting frame and for lowering the supporting frame to its horizontal position with the boom in' its horizontal position, said ⁇ gear including a cable guide mounted on said supporting frame between

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Civil Engineering (AREA)
  • Jib Cranes (AREA)

Description

K. w. cUsE FOLDABLE HOIST Feb. 7, 1956 Filed April 30, 1952 4 Sheets-Sheet l Feb. 7, 1956 K. w. coUsE 2,733,817
FOLDABLE HOIST Filed'ADIl 30, 1952 4 Sheets-Sheet 2 Vs i BY M
Feb. 7, 1956 K. w. cousE 2,733,817
FOLDABLE HOIST Filed April 30, 1952 4 Sheets-Sheet 3 BY M Feb. 7, 1956 Filed April 30. 1952 K. W. COUSE FOLDABLE HoIsT 4 Sheets-Sheet 4 United States Patent yf() FOLDABLE Horsr Kibbey W. Couse, Newark, N. I. Application April 30, 1952, Serial No. 285,262 1 claim. (c1.` 212-8) My invention relates to a foldable hoist and has as its prime object the provision of a foldable hoist having a boom which is swingable from one side of its supporting structure to a horizontal or nested position on the other side of the supporting structure and wherein the supporting structure for the boom is swingable vto a4 horizontal or nested position opposite from that of the boom.
it is another object of rny invention to provide a foldable hoist wherein the mechanism for operating the boom and for lifting loads carried by the boom may be operated by a small portable tool from a 'single location and by one man,
It is another object of my invention to provide a foldable hoist of the described type in which the operating mechanism is provided with means for holding such mechanism against the weight -of the boom and .any loads carried by it with the power disconnected. v
Other objects and `advantages of my invention will become apparent as the course of the specilication progresses. t
To attain the objects and advantages of my invention, I provide a foldable hoist having aboom Vand a support- 2,7 3 3 ,8 l 7 lit-atented Fby', 1956 2 Referring to the drawings, reference character 1 designates a V-shaped boom comprising members 2 and 3 converging at one end and diverginglat the opposite end of the boom. The diverging ends of members 2 and 3 are pivotally connected at 4 to a base plate 5 which is shown secured to foundation 6. Also pivotally connected at y4 to base plate 5 is a supporting frame 7 which is secured in a normal operating position by brace members 8 which ice are pivotally connected to foundation 6 and to opposite sides 9 and 10 of supporting frame 7. Boom 1 is swingable about its pivotal axis from one side of supporting frame 7 in its normal operating position over and about the supporting frame to a horizontal position; onits other side. t l
Supporting frame 7 has a windlass 51 mounted thereon for raising and `lowering the boom, whichwindlass` comprises a drum 20 rotatably mounted in frame 7, a gear wheel 21 operatively connectedto drum 20, and a worm gear 22 positioned for coaction with gear wheel 21. The windlass is connected with boom 1 by suitable .block and tackle gear comprising a line 23 which is secured to drum 20, a block pulley 24 pivotally connected at 25 to a triangular shaped plate 26 which is pivotally mounted at the diverging ends of boom` 1, and a block pulley 27 which is pivotally connected to members 28 which in turn are pivotally connected toopposite members 9 and 10 of frame 7. Line 23 extends from-drumli) over block pulley 20 is rotated in a counterclockwise `direction'.
ing structure for the boom both of which are pivotally p axis with the boom in its nested position from the normalV operating position to a Vhorizontal Aposition opposite from that Vof the boom. Suitable mechanism is provided for operating the boom and for raising `and lowering any load carried by the boom. This mechanism is adapted for operation by a portable hand tool and incorpo-rates a worm and gear wheel drive for holding the mechanism against the weight of the boom and any load carried b the boom with the power removed.
l shall describe one form of my invention and point out the novel features thereof in claim.
In the accompanying drawings, Fig. l is a perspective View of the foldable hoist showing the boom being raised on one side of the supporting structure.
Fig. 2 is a perspective view of the foldable hoist with the boom being lowered on the other side of the supporting structure.
Fig. 3 is a perspective view of the foldable hoist with the boom in its nested position and with a supporting structure being lowered into a horizontal position opposite from the boom.
Figs. 4 through 9 are side elevational views of the foldable hoist showing the boom in progressive stages of its operation from one side of the supporting structure to a nested position on the other side and showing the supporting structure being operated to its horizontal position with the boom in its nested position.
Fig. l0 is a top plan view of the boom and supporting structure in their horizontal positions with the block and tackle gear removed.
24 and over block pulley 27 back to pulley 24iwhere it is finally secured, and to beconnected to the boom. Boom 1 is raised by rotating drum 20 in a elockwiseidirection as viewed in Figs. 4 through 9 and is lowered when drum Worm gear 22 is provided with a male fitting 29 which is adapted to rotate the worm gear. The aforesaid windlass for controlling boom 1 mayI be operated by portable drill 30 having a recessed fitting 31 secured' thereon suitable for engaging male fitting 29. Portable drill 30 should be provided with a reversible motor so that it may be operated in onev direction to raise boom 1 and operated in'the opposite direction to lower boom 1. `Portable drill 30 may be of the pneumatic type as shown in the drawings ,Y in which eventAv it will be connected by a suitable air hose 32 to a source of compressed air.
ln operating boom 1 from one side` (Fig. 4) toa horizontalor nested position on the other side `(Fig. 8) portable drill V30 is caused torotate in a `clockwise direction as viewed in Figs. 4 and 5. Drum 20 responds by also rotating in a clockwise direction whereupon boom 1 is caused to raise. When boom 1 attains a vertical position the motor in portable drill 30 is reversed to provide for the lowering of boom 1. To initiate the lowering of boom-1, a slight force is imparted to the boom to move it beyond its vertical position. Secured to supporting member 7 at the upper ends of opposite members 9 and 10 is a bar 4l) which has a wheel 41 slidably mounted thereon. When boom 1 is operated to its other side (Figs. 6, 7 and 8) boom line 23 rides in wheel 41.
Supporting frame 7 is provided with another windlass 52 comprising drum 42, gear wheel 43, andvworm gear 44. Drum 42 has a line 45 wound thereon which line` extends over a pulley 46 which is pivotally mounted at 50 upon triangular plate 26. Line 45 is provided at the end thereof with theusual type of lifting hook 47. Worm gear 44 is provided with a male fitting 48 which is adapted for engagement by the recessed tting 31 secured upon portable drill't), thus enabling portable drill 30 to operate both windlasses. When drum 42 is caused to rotate in a clockwise direction (Figs. 4 to 9) lifting hook 47 and any load to which it is secured is caused to move upwardly. When drum 42 is moved in a counterclockwise direction, hook 47 and anyV load to which it might be attached is moved downwardly. When boom 1 is moved from one side as viewed in Figs. 4 and 5 of supporting frame 7 to its other side as viewed in Figs. 6 and 7 with boom 1 from the one side of supporting frame 7 to its other side, the hook and load remaining in a vertical position at all times. Windlass 52 is of course operable with the boom on its other side to raise and lower lifting hook 47. Boom 1 may have a plurality of encaged floodlights 48 secured at its converging ends which are directed in the direction of hook 47. Floodlights 48 are connected in the usual manner through suitable conduits encased within members 2 and 3 to pigtails 49.
As already noted, supporting frame 7 is pivotally connected at 4 to base plate 5 which is secured upon machine shop floor 6. It has also been noted that supporting frame 7 is secured in a normal operating position by brace members 8 which are connected both to the supporting frame and to foundation 6. When boom 1 is operated to a horizontal position on its other side (Fig. 8), brace members 8 are disconnected from supporting frame 7 to permit supporting frame 7 to be pivoted to the left as viewed in Fig. 8. In this connection, it is to be noted that supporting frame 7 is capable only of being pivoted in one direction, namely to the left as viewed in Fig. 8, the lower end of supporting frame 7 being especially formed for this purpose. The lower end of frame 7 accordingly has a rounded end formed on one side and a square end on its other side. If drum 20 of windlass 51 is rotated in a counterclockwise direction as viewed in Fig. 8 after boom 1 has attained its horizontal or nested position, supporting frame 7 is caused to pivot in a counterclockwise direction as viewed in Fig. 8 until it attains a horizontal position opposite from that of boom 1 (Fig. 9). Boom 1 is of sufficient weight to permit the supporting frame 7 to be lowered from its normal operating position to its horizontaloperating position without moving boom 1 from its nested position.
It will now be apparent that I have provided a foldable hoist having a boom and supporting structure for the boom and wherein the boom may be operated from one side of the supporting structure to a horizontal or nested position` on the other side of the supporting structure and wherein the supporting structure may be operated to a horizontal position opposite from the boom after the boom has attained its nested position. It will be apparent also-that my foldable hoist may be operated by a small portable drill or even by a hand crank from a single location and by one man, and that because of the worm and gear wheel driving mechanism incorporated into each windlass both the boom and any load carried thereby will be maintained in the` positions to which they have been operated until intentionally moved therefrom.
Although I have herein shown and described only one form of my invention, it is to be understood that various changes and modications may be made therein within the scope of the appended claim without departing from the spirit and scope of my invention.
What I claim is:
In a foldable hoist, the combination of a base, a boom comprising spaced members, a supporting frame for the boom pivotally mounted at one end on the base between said spaced members of the hoorn,` means separably connected to the supporting frame for securing the supporting frame in a normal vertical operating position, the boom members being pivotally mounted at one end on said base and the boom being swingable about its pivotal axis from a hoisting position at one side of the supporting frame about and over the supporting frame to a horizontal position on the opposite side of the frame, the supporting frame being swingable about its pivotal axis from its vertical normal yoperating position to a horizontal position opposite to the boom when the latter is horizontal, a windlass mounted on said supporting frame, and gear including a cable and pulleys connecting the windlass to the boom for raising and lowering the boom while the boom is at either side of the vertical supporting frame and for lowering the supporting frame to its horizontal position with the boom in' its horizontal position, said `gear including a cable guide mounted on said supporting frame between said windlass and the free end of said supporting frame to guide said cable around the end of said supporting frame when the boom is in the second-mentioned position, there being included in said gear a pulley connected to said boom, a second pulley connected to said supporting frame between said windlass and the free end of said supportingframe, said cable having one end connected to said boom and its other end connected to said windlass with the intermediate portions of the cable passing from said windlass around the first-mentioned pulley and thence around the second mentioned pulley to said boom when the boom is in the rst-mentioned position, and said cable also passing around said cable guide when the boom is in the second-mentioned position.
n References` Cited in the tile of this patent UNITED STATES PATENTS 980,846 Sochor Ian. 3, 1911 987,455 Fischer Mar. 21, 1911 1,053,047 Lewkowicz Feb. 11, 1913
US2733817D Foldable hoist Expired - Lifetime US2733817A (en)

Publications (1)

Publication Number Publication Date
US2733817A true US2733817A (en) 1956-02-07

Family

ID=3443378

Family Applications (1)

Application Number Title Priority Date Filing Date
US2733817D Expired - Lifetime US2733817A (en) Foldable hoist

Country Status (1)

Country Link
US (1) US2733817A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965244A (en) * 1958-10-08 1960-12-20 Marinus L Schat Davits for shipping provisions, stores, machinery spares and similar loads
US3001763A (en) * 1958-10-10 1961-09-26 Andrew A Pilot Hoist and towing attachment for children's wagons
US3050285A (en) * 1959-07-20 1962-08-21 Berger Ind Inc Metal logging spar
US3061113A (en) * 1960-02-25 1962-10-30 Walter E Johnson Mobile crane
US3062386A (en) * 1960-05-03 1962-11-06 Walter E Johnson Mobile crane construction
US3302931A (en) * 1966-06-15 1967-02-07 Walter L Blackburn Ratchet winch
US3584732A (en) * 1969-02-06 1971-06-15 Letco Inc Over-center winch apparatus
US4383792A (en) * 1980-09-02 1983-05-17 Clark G. Seabloom Crane for detachable mounting on a truck bed
EP0395297A3 (en) * 1989-04-26 1990-11-22 Spelean Pty. Ltd. Rescue frame
FR2719300A1 (en) * 1994-04-28 1995-11-03 Affuso D Anna Simply assembled and dismantled crane for building works
US5954471A (en) * 1997-05-30 1999-09-21 Cullen; Michael J. Crane attachment for a front end loader
US6045320A (en) * 1997-12-17 2000-04-04 Cullen; Michael J. Arm extension for a backhoe
US9073734B1 (en) * 2011-09-06 2015-07-07 Corn Crane LLC Hoisting apparatus
US10183849B2 (en) * 2016-02-28 2019-01-22 Honeywell International Inc. Rope guidance for second device used on DuraHoist arm

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US980846A (en) * 1910-05-06 1911-01-03 Friedrich Sochor Jib-crane.
US987455A (en) * 1910-08-24 1911-03-21 Fritz Fischer Jr Hoisting apparatus.
US1053047A (en) * 1912-12-21 1913-02-11 Martin Marine Life Saving Devices Ltd Boat hoisting and lowering apparatus.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US980846A (en) * 1910-05-06 1911-01-03 Friedrich Sochor Jib-crane.
US987455A (en) * 1910-08-24 1911-03-21 Fritz Fischer Jr Hoisting apparatus.
US1053047A (en) * 1912-12-21 1913-02-11 Martin Marine Life Saving Devices Ltd Boat hoisting and lowering apparatus.

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965244A (en) * 1958-10-08 1960-12-20 Marinus L Schat Davits for shipping provisions, stores, machinery spares and similar loads
US3001763A (en) * 1958-10-10 1961-09-26 Andrew A Pilot Hoist and towing attachment for children's wagons
US3050285A (en) * 1959-07-20 1962-08-21 Berger Ind Inc Metal logging spar
US3061113A (en) * 1960-02-25 1962-10-30 Walter E Johnson Mobile crane
US3062386A (en) * 1960-05-03 1962-11-06 Walter E Johnson Mobile crane construction
US3302931A (en) * 1966-06-15 1967-02-07 Walter L Blackburn Ratchet winch
US3584732A (en) * 1969-02-06 1971-06-15 Letco Inc Over-center winch apparatus
US4383792A (en) * 1980-09-02 1983-05-17 Clark G. Seabloom Crane for detachable mounting on a truck bed
EP0395297A3 (en) * 1989-04-26 1990-11-22 Spelean Pty. Ltd. Rescue frame
AU624496B2 (en) * 1989-04-26 1992-06-11 Spelean Pty. Ltd. Rescue frame
FR2719300A1 (en) * 1994-04-28 1995-11-03 Affuso D Anna Simply assembled and dismantled crane for building works
US5954471A (en) * 1997-05-30 1999-09-21 Cullen; Michael J. Crane attachment for a front end loader
US6481949B1 (en) 1997-05-30 2002-11-19 Michael J. Cullen Crane attachment for a front end loader
US6045320A (en) * 1997-12-17 2000-04-04 Cullen; Michael J. Arm extension for a backhoe
US9073734B1 (en) * 2011-09-06 2015-07-07 Corn Crane LLC Hoisting apparatus
US10183849B2 (en) * 2016-02-28 2019-01-22 Honeywell International Inc. Rope guidance for second device used on DuraHoist arm
US10662040B2 (en) * 2016-02-28 2020-05-26 Honeywell International Inc. Rope guidance for second device used on durahoist arm

Similar Documents

Publication Publication Date Title
US2733817A (en) Foldable hoist
US3043444A (en) Controlled motion crane
US2598517A (en) Portable winch
US2272949A (en) Car loading and unloading apparatus
US3202299A (en) Mobile guy derrick and counter balancing crane
US2670086A (en) Hoist and power unit therefor
US5240298A (en) Load-lifting and orienting apparatus
US1745045A (en) Portable crane
US2131479A (en) Loading hoist
US1245186A (en) Balanced crane or derrick.
US2786583A (en) Power operated boom for hoists or the like
US3467260A (en) Snorkel-equipped loading boom with safeguard against destructive bending of snorkel
US2470857A (en) Hoisting attachment for motordriven vehicles, such as tractors
US1175617A (en) Derrick.
US1280951A (en) Stump puller and stacker.
US2799402A (en) Power driven loading device
US2289487A (en) Truck loader
US2642198A (en) Hoisting cradle
JPS5849322Y2 (en) Work stage with trolley device
US987455A (en) Hoisting apparatus.
US2888150A (en) Level luffing attachment for cranes
US1825359A (en) Light wrecking crane
US2448310A (en) Clothesline
JP7678501B2 (en) Incline device
US362982A (en) Stone-laying jack