摘要:
An electrically powered hoisting system is operated by seating a line attached to the load to be hoisted in a groove formed between two sheave components and activating the electrical drive motor to rotate the sheave assembly. Voltage for the electrical drive motor is provided by an on-board 12 volt battery and voltage to the drive motor is controlled by means of a switch device. The groove formed by the sheave components has a resilient gripping surface that provides a firm line gripping action and hands-free and self-tailing operation. A davit, davit mounting brackets, and a flexible mounting assembly for mounting the powerhead assembly to a support are also disclosed.
摘要:
Planetary gears of an epicyclic drive train of a winch which drive a drum of the winch through a carrier which is at all times constrained to rotate with the drum, are used to keep a feeder/stripper arm of a self-tailing channel of a winch from rotating, by engagement between secondary gears and a gear ring associated with the feeder/stripper arm.
摘要:
A support frame assembly for a hoisting device including a cable drum pulling means mounted between two side-end members and at least two longitudinal girders arranged between the end members so that the ends of the longitudinal girders are substantially fixed in position relative to the end members. In order to reduce the expense of assembling and weight of the cable winch, the end members are clamped together in a longitudinal direction with at least one clamping means so that the ends of the longitudinal girders are, as a result, substantially fixed in position relative to the side-end members, at least in the longitudinal direction.
摘要:
A composite storage winch for use in the deployment and retrieval of anchor systems employed with motive offshore drilling platforms. The stowage winch includes: i) a pair or spaced apart pedestals on the drilling platform; ii) a drive shaft journaled in the pedestals; iii) first and second storage drums coaxially mounted on the drive shaft, the first storage drum having a diameter substantially less than that of the second storage drum; iv) a central circular flange having a diameter substantially greater than that of the second storage drum secured intermediate the first and second storage drums; v) second and third circular flanges having diameters substantially equal to the central flange and secured to the ends of the first and second drums; vi) a wire support groove extending from the outer peripheral edge of the sidewall on the central flange facing the second drum downwardly through the central flange tangentially with respect to the first drum and exiting from the central flange adjacent the first drum; vii) a wire rope lanyard having inboard and outboard ends with the inboard end fixedly secured to the second drum; viii) a wire mooring rope having inboard and outboard ends wound about the first drum with the inboard end extending through the wire support groove and being separably secured to the outboard end of the wire rope lanyard by a separable connector; and ix), a source of mobile power coupled to the drive shaft for rotation thereof.
摘要:
The most commonly used spring type chain lever hoists suffer from a major drawback in that, if the chain is drawn quickly over the load sheave while it is set for free running operation, the brake will automatically be applied and the free running movement terminated. Similarly, if a light load is suspended from the chain, the weight of the load may be insufficient to activate the brake with the result that the load will be wound down dangerously quickly, leading on occasion to accidents. The present invention is designed to resolve these potentially fatal flaws by enabling a hub, which screws freely onto a spindle in the conventional manner, to be rotated through a few degrees into a prescribed lock position relative to the spindle and then locked there either temporarily or permanently as required.
摘要:
A which winch can permit free-fall is disclosed, which includes a shaft adapted to be driven by a source of power, a first cone connected about the shaft to be driven therewith, and a second cone co-axial with the first cone and movable axially relative thereto. The second cone can be caused to assume one of two axial positions relative to the first cone, the arrangement being such that a rope or chain passing between the two cones can be driven by the winch when the second cone is in one of its two positions and can free-fall when the second cone is in the other of its two positions.
摘要:
An automatic three-speed winch comprising a base plate (1), a bollard (2) mounted for rotation relative to said base plate and carrying teeth (7) on its inner surface, arranged to cooperate through intermediate gears, with at least one driving gear (5, 6) around a central shaft (14) of the winch. An element (21, 22) is provided, which is mounted for rotation between a first and a second position about the central shaft (4) of the winch, which element carries three shafts (12, 14, 20), with a pair of gears (8, 11; 18, 19; 10, 13) being mounted for rotation about each shaft. The transition between the three different speeds takes place fully automatically by just changing the direction of rotation of the driving gear, without requiring any further operation on the winch.
摘要:
This scaffold hoist uses a transmission mechanism whose output shafts are fastened to the hoist housing, and whose case rotates, carrying a sheave which impels the mechanism along the cable. The transmission mechanism is advantageously a quadrant drive for extremely high torque-to-weight ratio.The sheave has a peripheral groove, tapered and deep enough to seat a cable having any of three different diameters, at different depths in the groove.The cable wraps around three-fourths of the sheave. Around five-eighths of the sheave, a chain presses the cable into the groove. The chain rollers enter the groove deeply enough to engage even the smallest-diameter cables of interest, while clearing the sheave periphery. The chain side bars ride along the sides of the sheave, holding the chain and cable in position.A resettable overspeed brake uses a rotary cam that jams a cable of any of the three sizes, at correspondingly various cam angles. The cam is cocked out of contact with the cable, and immediately spring-driven against the cable when triggered by a centrifugal sensor. A backup block--which keeps the cable from retreating from the cam--slides away from the cable at an angle during resetting, to facilitate unjamming the cable by moderate force.
摘要:
An apparatus for transporting or displacing elongated objects in a direction longitudinal to the object comprises a rotatable traction wheel including a first and a second disc. A plurality of arcuately shaped ridges are defined on opposing surfaces of the discs. The ridges extend substantially axially from the center of the discs to the circumferences of the discs. The first and second discs are journalled to a rotatable shaft. The axial and angular positions of one or both of the discs with respect to the shaft may be adjustable. The shaft may include an articulated joint to permit the angle of rotation of the first disc to be displaced from the angle of rotation of the second disc.
摘要:
The channel of a self-tailing winch is made up of two jaw members (5,17) interlinked by an arrangement such that when there is relative rotation between the jaws a relative axial displacement is imposed upon them by that relative rotation. Cam following studs (20) associated with one jaw engage in inclined camming slots (22) associated with the other. The inclination of the slots is preferably "positive" i.e. such as to cause closer axial approach of the jaws when there is any slippage.