US2714434A - Power driven winch and hoist mechanism - Google Patents

Power driven winch and hoist mechanism Download PDF

Info

Publication number
US2714434A
US2714434A US465225A US46522554A US2714434A US 2714434 A US2714434 A US 2714434A US 465225 A US465225 A US 465225A US 46522554 A US46522554 A US 46522554A US 2714434 A US2714434 A US 2714434A
Authority
US
United States
Prior art keywords
winch
clutch
engine
load
drive
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
US465225A
Inventor
Peterson Harold William
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US465225A priority Critical patent/US2714434A/en
Application granted granted Critical
Publication of US2714434A publication Critical patent/US2714434A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02—Driving gear
    • B66D1/14—Power transmissions between power sources and drums or barrels
    • B66D1/20—Chain, belt, or friction drives, e.g. incorporating sheaves of fixed or variable ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0125—Motor operated winches
    • B66D2700/015—Actuated by chain, belt or by friction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S187/00—Elevator, industrial lift truck, or stationary lift for vehicle
    • Y10S187/90—Temporary construction elevator for building

Definitions

  • the present invention relates to a power drive and winch mechanism which is particularly useful on temporary elevators employed on construction projects.
  • winches used on construction projects remain continually exposed to the elements. Operation often proceeds at temperatures below freezing. Since the units must be portable, small pull-rope started gasoline engines usually furnish the power. These are often hard to start, particularly if the winch mechanism is directly coupled to the engine as is the conventional practice.
  • the engine may stall or otherwise fail when the load is raised. Such a stall is both time-consuming and often dangerous to the operator when the load is in the raised position. Safety in conventional installations demands that the load be lowered to a resting point before an attempt to start the engine is made.
  • a related object of the invention is to provide a gasoline engine powered winch mechanism which can be safely started when the load is in the raised position.
  • Still another object of the invention is to provide a winch power drive which is adaptable to many existing winch units.
  • Figure 1 is a perspective view of the winch mechanism employed with a temporary construction elevator on a building site.
  • Fig. 2 is an enlarged perspective view of the engine, drive, and winch employed in the elevator shown in Fig. 1.
  • Fig. 3 is a perspective exploded partially diagrammatic view of the drive coupling between the engine and winch shown in Fig. 2.
  • the elevator shown in Fig. l is a typical illustration of the type of elevator in which the present invention finds utility, and the use for which such elevators are employed.
  • the elevator is in the form of a modified A-frame with a ladder track 11 and a support post 12 completing the A-frame.
  • the load platform 14 rides along the ladder track 11 guided by suitable rollers.
  • the hoisting cable 15 is fixed to the upper portion of the load platform 14 at the connector 16, and is reaved over a pulley at the apex of the A-frame (not shown).
  • the cable 15 leads downwardly to the winch assembly Where it is coiled over the winch cable drum 21.
  • a self-levelling control cable 18 is normally employed with the elevator in order to preselect the height at which the load platform 14 will automatically stop.
  • the winch control and drive assembly 20 is illustrated in greater detail in Fig. 2. There it will be seen that the hoisting cable 15 coils between the guide discs 22 of the cable drum 21.
  • a mechanically operated control brake 24 is located directly coupled to the winch drum asssembly and actuated by brake control arm 25.
  • Both of these brakes are self-energizing in the direction of lowering the load. That is, the brakes tend to set themselves when the load is lowered, whereas when the load is being raised, even if the operator exerts pressure on the control arm 25 actuating the control brake 24, no extensive braking action results. On the other hand, even a slight pressure on the control brake arm 25 when the load is moving downwardly will call into action the self-energizing features of the brake and immediately lock the winch drum 21 and hold the load platform in position.
  • the clutch-throttle assembly comprises a clutch control arm 31 which is connected to the engine throttle cable 32 at its lower end portion by a throttle grip assembly 34.
  • the effect of this two-fold connection operates to advance the throttle of the engine thereby increasing its speed and power delivery when the clutch arm 31 is moved in order to actuate the winch mechanism to raise the load.
  • the winch clutch 30 itself is actuated by the clutch connecting coupling 35 which engages the winch clutch at the winch clutch wrist pin 36.
  • the gasoline engine 38 is a conventional air-cooled single cylinder engine, the construction or details of which are not specifically contemplated by the invention.
  • the engine is mounted to the same base frame 39 as the winch and its drive assembly.
  • the engine-winch assembly drive coupling 40 transmits the power from the engine to the reduction gear housed in the reduction gear housing 37.
  • the motion of the engine is then converted to a low speed shaft which tunnels through the winch drum as: sembly and couples to the winch through the clutch assembly 30 at the opposite side of the winch drum.
  • the drive assembly 40 has been given an automatic control feature through the combined action of a cushioned coupling assembly 41 and a speed-controlled clutch 45.
  • the speed-controlled clutch 45 may be of the centrifugallyoperated variety which contemplates internal radially positioned elements which engage an outer drum when a certain centrifugal force is built up by the speed of the rotating shaft 42. Best operation has been found when the clutch is adjusted to engage at 600 R. P. M., although variations in this setting are contemplated to fall within the spirit of the invention.
  • the clutch-driven shaft 44 connects, with the clutch coupling assembly 41. Such a coupling serves the twofold function of cushioning the inertia load and compensating for misalignment of the drive shaft.
  • the coupling assembly contemplates an internal spider 46 flanked by the prongs 48 of the coupling elements 49. The drive shaft 50 then continues to trans.- mit the power to the reduction gear assembly 3'7.
  • the winch clutch 30 can be fully engaged.
  • the engine clutch 45 will automatically engage itself as the winch clutch is engaged because simultaneously the engine throttle is advanced which increases the speed of the engine and thereby actuates the speed clutch 45 of the engine into its driving condition.
  • the engine exhaust pipe assembly 51 may be directed at the gear assembly 37 at the discretion of the operator. In summer operation, of course, this additional heat would be undesirable and accordingly means for selectively controlling the exhaust are contemplated.
  • a winch mechanism including a gasoline type engine power source, a winch clutch and throttle control, and a self-energizing load brake, the combination comprising a low speed disengaging clutch coupled to the motor, and a cushioned coupling between the low speed clutch and the winch clutch drive.
  • a winch mechanism including a gasoline type engine power source, a winch clutch and throttle control, a self-energizing load brake, and a second self energizing safety brake engaged with the clutch, the combination comprising a low speed automatically disengaging clutch coupled to the motor, and a cushioned coupling between the low speed clutch and the winch clutch drive.
  • a winch mechanism including a gasoline type engine power source and speed reducing gear box, a winch clutch and throttle control, and a self-energizing load brake, the combination comprising a low speed disengaging clutch coupled to the motor, a cushioned coupling between the low speed clutch and the winch clutch drive, and selective means for diverting the hot engine exhaust gases toward the gear box.
  • a drive mechanism comprising, in combination, a self-energizing load brake on the winch, a winch clutch, drive means connecting the winch clutch to the engine, and a low speed disengaging clutch included in such drive means which permits hand starting of the engine without actuating any of the Winch mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

Aug. 2, 1955 H. w. PETERSON 2,714,434
POWER DRIVEN WINCH AND HOIST MECHANISM Filed 001'.- 28, 1954 CLUTCH SPEED RESPONSIVE if K I $ELF-ENER6IZED SAFETY BRAKE THROTTLE CONTROL fndemio 1r HaroZcZ UJ peieagsaw United States Patent 2,714,434 POWER DRIVEN WINCH AND HOIST MECHANISM Harold William Peterson, Chicago, Ill. Application October 28, 1954, Serial No. 465,225 4 Claims. (Cl. 192-.094)
The present invention relates to a power drive and winch mechanism which is particularly useful on temporary elevators employed on construction projects.
Usually the winches used on construction projects remain continually exposed to the elements. Operation often proceeds at temperatures below freezing. Since the units must be portable, small pull-rope started gasoline engines usually furnish the power. These are often hard to start, particularly if the winch mechanism is directly coupled to the engine as is the conventional practice.
In addition, the engine may stall or otherwise fail when the load is raised. Such a stall is both time-consuming and often dangerous to the operator when the load is in the raised position. Safety in conventional installations demands that the load be lowered to a resting point before an attempt to start the engine is made.
With the foregoing in mind it is the general object of the present invention to furnish a power winch unit which affords greater ease and safety in starting and operation. A related object of the invention is to provide a gasoline engine powered winch mechanism which can be safely started when the load is in the raised position.
Still another object of the invention is to provide a winch power drive which is adaptable to many existing winch units.
Further objects and advantages of the invention will become apparent as the following description proceeds, taken in connection with the accompanying drawings, in which:
Figure 1 is a perspective view of the winch mechanism employed with a temporary construction elevator on a building site.
Fig. 2 is an enlarged perspective view of the engine, drive, and winch employed in the elevator shown in Fig. 1.
Fig. 3 is a perspective exploded partially diagrammatic view of the drive coupling between the engine and winch shown in Fig. 2.
The elevator shown in Fig. l is a typical illustration of the type of elevator in which the present invention finds utility, and the use for which such elevators are employed. Referring now to the drawing, the elevator is in the form of a modified A-frame with a ladder track 11 and a support post 12 completing the A-frame. The load platform 14 rides along the ladder track 11 guided by suitable rollers.
The hoisting cable 15 is fixed to the upper portion of the load platform 14 at the connector 16, and is reaved over a pulley at the apex of the A-frame (not shown). The cable 15 leads downwardly to the winch assembly Where it is coiled over the winch cable drum 21. A self-levelling control cable 18 is normally employed with the elevator in order to preselect the height at which the load platform 14 will automatically stop.
The winch control and drive assembly 20 is illustrated in greater detail in Fig. 2. There it will be seen that the hoisting cable 15 coils between the guide discs 22 of the cable drum 21. A mechanically operated control brake 24 is located directly coupled to the winch drum asssembly and actuated by brake control arm 25.
An additional preloaded self energizing brake assembly 26, which may be loaded when the main clutch is engaged (to be described later) may be provided at the other side of the winch drum. Both of these brakes are self-energizing in the direction of lowering the load. That is, the brakes tend to set themselves when the load is lowered, whereas when the load is being raised, even if the operator exerts pressure on the control arm 25 actuating the control brake 24, no extensive braking action results. On the other hand, even a slight pressure on the control brake arm 25 when the load is moving downwardly will call into action the self-energizing features of the brake and immediately lock the winch drum 21 and hold the load platform in position.
The clutch-throttle assembly comprises a clutch control arm 31 which is connected to the engine throttle cable 32 at its lower end portion by a throttle grip assembly 34. The effect of this two-fold connection operates to advance the throttle of the engine thereby increasing its speed and power delivery when the clutch arm 31 is moved in order to actuate the winch mechanism to raise the load. The winch clutch 30 itself is actuated by the clutch connecting coupling 35 which engages the winch clutch at the winch clutch wrist pin 36.
The gasoline engine 38 is a conventional air-cooled single cylinder engine, the construction or details of which are not specifically contemplated by the invention. The engine is mounted to the same base frame 39 as the winch and its drive assembly. The engine-winch assembly drive coupling 40 transmits the power from the engine to the reduction gear housed in the reduction gear housing 37. The motion of the engine is then converted to a low speed shaft which tunnels through the winch drum as: sembly and couples to the winch through the clutch assembly 30 at the opposite side of the winch drum.
It will be appreciated that considerable heavy grease and lubrication is required for this gear reduction and winch drive assembly. In winter operation particularly when the temperature is below freezing the lubricants offer considerable resistance to the drive transmission until, through operation, the grease is warmed and becomes less viscous. Since the engine is hand started by means of a conventional starting pull rope coiled about the starter pulley 33, the engine may become extremely diflicult to start when the operator must .necessarily turn over the entire winch drive mechanism along with the motor.
In operating a conventional winch after the engine is started the clutch arm 31 is moved by the operator to engage the clutch and advance the throttle. Should the engine kill at any stage the self-energized safety brake 26 will prevent the load from dropping so long as the clutch is engaged. But the engine cannot be started with the clutch engaged. Consequently the clutch and safety brake must both be released. Then the handbrake 24 must be actuated to prevent the load from falling. The operator cannot safely hold the hand brake arm 25 and start the engine, so he must first lower the load to a resting position. This can, and does, prove costly when the masons and other construction men are idled by not having their materials at hand.
In order to overcome these operational difficulties the drive assembly 40 has been given an automatic control feature through the combined action of a cushioned coupling assembly 41 and a speed-controlled clutch 45. The speed-controlled clutch 45 may be of the centrifugallyoperated variety which contemplates internal radially positioned elements which engage an outer drum when a certain centrifugal force is built up by the speed of the rotating shaft 42. Best operation has been found when the clutch is adjusted to engage at 600 R. P. M., although variations in this setting are contemplated to fall within the spirit of the invention. The clutch-driven shaft 44 connects, with the clutch coupling assembly 41. Such a coupling serves the twofold function of cushioning the inertia load and compensating for misalignment of the drive shaft. The coupling assembly contemplates an internal spider 46 flanked by the prongs 48 of the coupling elements 49. The drive shaft 50 then continues to trans.- mit the power to the reduction gear assembly 3'7.
In operation, when the engine is started, the operator need only pull over the engine itself, the extensive mechanism of a winch drive and clutch being disengaged at the speed, clutch 45. After the engine is started the operator is then free to grasp the winch brake control arm 25 with one hand and increase the engine speed through manipulating the winch clutch control arm and throttle control 31, 32,.
After the engine has exhibited sufficient power and is warmed up, the winch clutch 30 can be fully engaged. The engine clutch 45 will automatically engage itself as the winch clutch is engaged because simultaneously the engine throttle is advanced which increases the speed of the engine and thereby actuates the speed clutch 45 of the engine into its driving condition.
In order to further implement the winter starting features of the winch drive proposed, the engine exhaust pipe assembly 51 may be directed at the gear assembly 37 at the discretion of the operator. In summer operation, of course, this additional heat would be undesirable and accordingly means for selectively controlling the exhaust are contemplated.
If the load platform 14 should be at the working site and the engine kill, the operator can safely restart since neither the winch clutch 30 nor the safety brake 26 need be disengaged. After the engine has reached its speed the winch is again ready for operation.
Although one particular embodiment of the invention has been shown and described in full here, there is no intention to thereby limit the invention to the details of such embodiment. On the contrary, the intention is to cover all modifications, alternative embodiments, usages and equivalents of the winch mechanism and drive as fall within the spirit and scope of the invention, specification and appended claims.
I claim as my invention:
1. In a winch mechanism including a gasoline type engine power source, a winch clutch and throttle control, and a self-energizing load brake, the combination comprising a low speed disengaging clutch coupled to the motor, and a cushioned coupling between the low speed clutch and the winch clutch drive.
2. In a winch mechanism including a gasoline type engine power source, a winch clutch and throttle control, a self-energizing load brake, and a second self energizing safety brake engaged with the clutch, the combination comprising a low speed automatically disengaging clutch coupled to the motor, and a cushioned coupling between the low speed clutch and the winch clutch drive.
3. In a winch mechanism including a gasoline type engine power source and speed reducing gear box, a winch clutch and throttle control, and a self-energizing load brake, the combination comprising a low speed disengaging clutch coupled to the motor, a cushioned coupling between the low speed clutch and the winch clutch drive, and selective means for diverting the hot engine exhaust gases toward the gear box.
4. For use with a gasoline engine powered winch, a drive mechanism comprising, in combination, a self-energizing load brake on the winch, a winch clutch, drive means connecting the winch clutch to the engine, and a low speed disengaging clutch included in such drive means which permits hand starting of the engine without actuating any of the Winch mechanism.
References Cited in the file of this patent UNITED STATES PATENTS
US465225A 1954-10-28 1954-10-28 Power driven winch and hoist mechanism Expired - Lifetime US2714434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US465225A US2714434A (en) 1954-10-28 1954-10-28 Power driven winch and hoist mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US465225A US2714434A (en) 1954-10-28 1954-10-28 Power driven winch and hoist mechanism

Publications (1)

Publication Number Publication Date
US2714434A true US2714434A (en) 1955-08-02

Family

ID=23846945

Family Applications (1)

Application Number Title Priority Date Filing Date
US465225A Expired - Lifetime US2714434A (en) 1954-10-28 1954-10-28 Power driven winch and hoist mechanism

Country Status (1)

Country Link
US (1) US2714434A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894605A (en) * 1956-10-02 1959-07-14 Lester W Leavitt Portable fork lift truck
US3165297A (en) * 1962-02-26 1965-01-12 Parke H Thompson Ii Hoisting and pulling apparatus
US3476212A (en) * 1968-06-24 1969-11-04 William V Eakins Combination stepladder and vertically movable platform
US4128228A (en) * 1977-06-09 1978-12-05 Ziegelmann Frank E Extension ladder hoist
FR2440908A1 (en) * 1978-11-07 1980-06-06 Dutton Lainson Co WINCH
US4269285A (en) * 1977-11-09 1981-05-26 Tokyo Shibaura Denki Kabushiki Kaisha Lifting apparatus for electrical switchboards
US4930599A (en) * 1989-08-17 1990-06-05 Simms Sr Ernest L Ladder and carriage combination
US6095284A (en) * 1999-10-06 2000-08-01 Smith; Elwaine Elevatable stands for physically challenged hunters
US6234453B1 (en) 1999-08-12 2001-05-22 Michael W. Block Rolling door winch apparatus
US6244381B1 (en) * 2000-02-18 2001-06-12 Timothy E. Ruble Ladder hoist device
US7004288B2 (en) * 2001-08-08 2006-02-28 Ryo Keiso Ltd. Lift apparatus
US20070107990A1 (en) * 2005-11-07 2007-05-17 Schwertner Larry V Personnel lift apparatus
US20070267250A1 (en) * 2006-05-19 2007-11-22 Wolff Richard J Electric human lift
US7424932B1 (en) 2004-09-02 2008-09-16 Patrick Arthur Murphy Lifting hoist assembly
US7900745B1 (en) 2007-03-27 2011-03-08 Tindal Kenneth W Motor driven lifting assembly
US8322489B1 (en) 2012-02-12 2012-12-04 Orville Douglas Denison Aerial rescue device
US20130068559A1 (en) * 2011-09-20 2013-03-21 Gilberto M. Grado Cargo Lifting Device For A Ladder
US20140246271A1 (en) * 2013-02-11 2014-09-04 Paul Morris Davies Extension ladder incorporating a winch-operated elevator
US20150300090A1 (en) * 2014-04-21 2015-10-22 Warren STRAND Ladder lift system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1517616A (en) * 1920-12-28 1924-12-02 Clayden Arthur Winch
US1692027A (en) * 1927-05-19 1928-11-20 Waukesha Motor Co Combination brake and guard structure
US2180469A (en) * 1939-11-21 Transmission
US2202551A (en) * 1939-05-01 1940-05-28 Jones Shelburne & Guffey Inc Control mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2180469A (en) * 1939-11-21 Transmission
US1517616A (en) * 1920-12-28 1924-12-02 Clayden Arthur Winch
US1692027A (en) * 1927-05-19 1928-11-20 Waukesha Motor Co Combination brake and guard structure
US2202551A (en) * 1939-05-01 1940-05-28 Jones Shelburne & Guffey Inc Control mechanism

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894605A (en) * 1956-10-02 1959-07-14 Lester W Leavitt Portable fork lift truck
US3165297A (en) * 1962-02-26 1965-01-12 Parke H Thompson Ii Hoisting and pulling apparatus
US3476212A (en) * 1968-06-24 1969-11-04 William V Eakins Combination stepladder and vertically movable platform
US4128228A (en) * 1977-06-09 1978-12-05 Ziegelmann Frank E Extension ladder hoist
US4269285A (en) * 1977-11-09 1981-05-26 Tokyo Shibaura Denki Kabushiki Kaisha Lifting apparatus for electrical switchboards
FR2440908A1 (en) * 1978-11-07 1980-06-06 Dutton Lainson Co WINCH
US4215850A (en) * 1978-11-07 1980-08-05 Dutton-Lainson Company Winch
US4930599A (en) * 1989-08-17 1990-06-05 Simms Sr Ernest L Ladder and carriage combination
US6234453B1 (en) 1999-08-12 2001-05-22 Michael W. Block Rolling door winch apparatus
US6095284A (en) * 1999-10-06 2000-08-01 Smith; Elwaine Elevatable stands for physically challenged hunters
US6244381B1 (en) * 2000-02-18 2001-06-12 Timothy E. Ruble Ladder hoist device
US7004288B2 (en) * 2001-08-08 2006-02-28 Ryo Keiso Ltd. Lift apparatus
US7424932B1 (en) 2004-09-02 2008-09-16 Patrick Arthur Murphy Lifting hoist assembly
US7686566B1 (en) 2004-09-02 2010-03-30 Patrick Arthur Murphy Method of using a lifting hoist
US20070107990A1 (en) * 2005-11-07 2007-05-17 Schwertner Larry V Personnel lift apparatus
US7546902B2 (en) * 2005-11-07 2009-06-16 Larry Victor Schwertner Personnel lift apparatus
US20070267250A1 (en) * 2006-05-19 2007-11-22 Wolff Richard J Electric human lift
US7900745B1 (en) 2007-03-27 2011-03-08 Tindal Kenneth W Motor driven lifting assembly
US20130068559A1 (en) * 2011-09-20 2013-03-21 Gilberto M. Grado Cargo Lifting Device For A Ladder
US8689937B2 (en) * 2011-09-20 2014-04-08 Gilberto M. Grado Cargo lifting device for a ladder
US8322489B1 (en) 2012-02-12 2012-12-04 Orville Douglas Denison Aerial rescue device
US20140246271A1 (en) * 2013-02-11 2014-09-04 Paul Morris Davies Extension ladder incorporating a winch-operated elevator
US20150300090A1 (en) * 2014-04-21 2015-10-22 Warren STRAND Ladder lift system

Similar Documents

Publication Publication Date Title
US2714434A (en) Power driven winch and hoist mechanism
US5860635A (en) Winch having hydraulic speed control and planetary gear system
US4196889A (en) Hand-held powered portable winch
US3053344A (en) Automatic control system for hoisting machine
GB1411177A (en) Tower cranes
US3102434A (en) Automatic control of output reversal in slippable drives for transmitting torque
US3819156A (en) Hoist drum control
US4136855A (en) Hoist drum drive control
US2159250A (en) Oil well hoist
US3062344A (en) Power hoist with manual operating device
US1952728A (en) Hoisting apparatus
CA1286654C (en) Cable hoist
US3251435A (en) Single lever throttle and shift control mechanism
GB443646A (en) Improvements in winches and like hoisting apparatus
RU143761U1 (en) MOBILE DRILLING AND DRILLING UNIT
JPS627668Y2 (en)
US6164627A (en) Device for hydraulically actuating winches in a pipe-laying machine
US1774389A (en) Winding engine
JPS5472840A (en) Motor driven winch
FR2421139A1 (en) Winch for construction work - has double acting clutch to enable driving motor to be used as brake when load is descending
US1489219A (en) Hoisting apparatus
NZ213831A (en) Torque transmission arrangement for driving rotary member:input shaft drives modulated wet clutch output of which drives torque converter
US1304359A (en) Hoisting apparatus
US1971351A (en) Hoisting mechanism
US1068070A (en) Hoisting apparatus.