Abstract: A safety device for a crane which can make a safety operation precisely taking a relationship between a swinging condition of a boom and a limit working region into consideration. In the device, a working radius and a swinging angle of the boom and projection amounts of projectable support members of the crane are detected, and a limit working region of the boom is set in accordance with a weight of a suspended cargo and the projection amounts. A remaining angle over which the boom can be swung until the set limit working region is exceeded is calculated, and also a braking angular acceleration at which swinging movement of the boom is braked and stopped without leaving a shake of the suspended cargo is calculated. Further, a swinging angle of the boom required to brake and stop the swinging movement of the boom at the braking angular acceleration is calculated, and the thus calculated required angle and the remaining angle are compared with each other.

Abstract: An outboard motor for mounting on the transom of a boat, having a horizontal engine and output shaft, an exhaust system having horizontal and vertical portions including an enlarged cross sectional water jacketed muffler within a water chamber having a retaining wall defining the water level, is tiltable and provides an enclosure for the engine area including a cowling, hood, and moveable hood section and a sleeve between the moveable hood and engine to perfect enclosure during tilting.

Abstract: An anchor which attaches to a tree, stump or other stationary object for anchoring a buoyant vessel such as a boat, in a relatively stationary position. The anchor consisting of a clamping device, a pair of tongs attached to and extending from the clamping device, and an anchor line to attach the anchor to the boat. The tong engaging the tree or other stationary object to securely anchor and hold the boat in a relatively stationary position.

Abstract: A multiple fin surfboard defines a generally elongated planar surfboard having a plurality of elongated slots defined therein. The slots are grouped close to each end of the surfboard and support a corresponding plurality of fins in a pivotal attachment. The fins each support transverse vanes which are acted upon by a water passage beneath the surfboard to alternatively retract the fins at one end of the surfboard and downwardly extend the fins at the opposite end of the surfboard.

Abstract: A cylindrical elastic mount with a vibration damper, including radially spaced-apart inner and outer sleeves, an elastic body interposed between the inner and outer sleeves so as to elastically connct the two sleeves, and a generally cylindrical rigid split member disposed between the inner and outer sleeves and elasticallly supported by the two sleeves through the elastic body, such that the elastic body is divided by the rigid split member into radially inner and outer portions. The rigid split member and the elastic body cooperate with each other to provide the vibration damper. The generally cylindrical rigid split member consists of a plurality of rigid segments which are embedded in the elastic body such that adjacent segments of the plurality of rigid segments abut on each other at circumferentially opposed end faces thereof so as to assume a generally cylindrical shape.

Abstract: A reeving apparatus for a crane having an overhead frame, a lifting beam subject to swaying forces, and a winding drum mounted on the frame for raising and lowering the lifting beam. First, second, third and fourth spaced apart rotatable sheaves are mounted on the lifting beam for supporting the lifting beam. The first and second sheaves are spaced apart in directions horizontally transverse to a longitudinal axis of the drum. The third and fourth sheaves are positioned generally below opposite ends of the drum. Alternate ones of the sheaves comprise single sheaves having first and second grooves and the other ones of the sheaves each comprise a pair of sheaves each having single grooves. A plurality of ropes are affixed to the drum and to the overhead frame, and each one of the plurality of ropes is wrapped around one of the sheaves for supporting the lifting beam together with the sheaves.

Abstract: A method of manufacturing a fluid-filled elastic mount which includes an electric body flexibly connecting an inner and an outer sleeve, means for defining a pressure-receiving chamber and an equilibrium chamber which are filled with a non-compressible fluid, and means for defining an orifice passage for fluid connection between the two chambers, the equilibrium chamber being defined partially by a rigid member and partially by a flexible diaphragm which permits volumetric changes of he equilibrium chamber.

Abstract: A boom point construction connects the for and aft mountings of a sheave swivel to the major structural elements of a boom. The boom point includes a framework of elongated members joined together to form a truss. The framework includes assemblies of at least three members joined together at one common point and extending in different directions from the point to define three different planes. Two of the assemblies extend from opposite sides of the front swivel support and another of the assemblies extends from the rear swivel support. A member of the assemblies from the front swivel support is connected to members of the assembly extending from the rear swivel support. The boom point is shown connecting the swivel to a boom having either three or four major longitudinal structural elements.

Abstract: A V bottom hull watercraft powered by a pair of jet propulsion units that are supported for pivotal movement about horizontally disposed pivot axes and rotary movement about a longitudinal pivot axis to rotate the water inlet openings and elevate them from a downwardly facing normal operating position and an upwardly facing service position. The water inlet openings are disposed so that they extend parallel to the sides of the V bottom. Steering nozzles are supported for pivotal movement at the discharge ends of the jet propulsion units and pivot about vertically extending axes that are not perpendicular to the water inlet openings so that no vertical thrust will be exerted on the watercraft hull when the steering nozzles are pivoted to effect steering.

Abstract: The invention is directed to a concrete placing boom assembly for use with two trucks. The assembly includes a base frame and a rotatable turret rotatably mounted on the base frame. A foldable boom is pivotally connected to the turret and includes a plurality of boom arms articulately connected one with the other so as to be unfoldable to define an extended boom and foldable to define a stack. The foldable boom is separable at a separation location into two sections transportable on respective ones of the trucks. The assembly of the invention makes it unnecessary to provide auxiliary assembly apparatus for coupling the two sections together.

Abstract: A vehicle parking brake system automatically adapts to the road surface condition when operated while the vehicle is moving. The parking brake pressure is automatically controlled, in response to an operator command to initiate the parking brake function or in response to a failure of the hydraulic front brakes while the vehicle is moving, to establish and limit wheel slip at a desired controlled slip between each of the braked wheels and the road surface so as to automatically adapt to the road surface coefficient of friction.

Abstract: A boom support assembly for an earth working machine, which includes a winch, a pair of tension members and a pendant pin link interposed between tension members. The first tension member is a boom support pendant secured to a boom point of a boom and the first end of the pendant pin link. The second tension member is a boom raising rope which is received over a plurality of gantry sheaves mounted on the top portion of a gantry structure and attached to the winch at one end and attached to the second end of the pendant pin link. The gantry sheaves are mounted on an alignment apparatus that has a sheave shaft mounted in an eccentric bore of a pair of cartridges rotatable in the top portion of the gantry structure. This alignment apparatus insures the proper positioning of a through bore of the pendant pin link between support openings in the top portion of the gantry.

Abstract: A flushing device for supplying water to the cooling intake port of an inboard motor boat propulsion unit when the boat is out of the water and which has a suction cup adapted to cover the intake port and supported from the ground by a telescoping handle and provides a hose bib in communication with a garden hose.

Abstract: A brake disk according to the present invention incorporates a large number of air ducts defined in a disk portion having opposite sides to be clamped between friction pads, with the air ducts extending radially through the disk portion, and a plurality of joining portions formed on a mounting flange portion at circumferential distances and joined to a wheel hub by bolts. The disk portion is formed so that the heat capacity thereof is larger in an area nearer to the joining portions and smaller in an area more remote from the joining portions. The distance between adjacent ones of a large number of partitions defining the air ducts can be smaller in a location nearer to the joining portions and larger in a location more remote from the joining portions. Alternatively, a large number of partitions defining the air ducts are formed so that the ones nearer to the joining portions are larger in wall thickness and the partitions more remote from the joining portions are smaller in wall thickness.

Abstract: A crane having a boom and a jib swingable on the boom between a taken in position and a stretched out position includes a jib holding construction. A jib hold rod is movably mounted on the jib between a first position in which a base end of the jib hold rod is connected to the jib when the jib is in the taken in position, and a second position in which the base end of the jib hold rod is connected to a portion of the boom for supporting the jib in the stretched out position. A rod holding link is mounted to the jib for selectively holding the base end of the jib hold rod at a correct position for connection to the boom when the jib is swung out to the stretched out position. This avoids the need to manually locate the jib hold rod in the second position when the jib is stretched out.

Abstract: A drum brake includes a pair of brake shoes which are provided such that when expanded, they are forced against a brake drum to generate a braking force, a strut which is received in notches formed in the respective webs of the brake shoes so as to extend therebetween, a parking lever which is rotatably supported on either one of the brake shoes such that when rotated, it engages the strut to expand the brake shoes, and a coil spring which is loaded between the strut and the notch formed in the web of the other brake shoe to bias the strut toward the first brake shoe. The notch in the web that is engaged with the strut includes a first notch portion that is formed by cutting the outer peripheral portion of the web and a second notch portion that is formed by further cutting the web at the bottom of the first notch portion at the approximately central portion thereof in the direction of the width of the notch.

Abstract: In a hydraulic telescopic damper with a cylinder (10) and a piston (12) which has a check valve (O-ring 18) and a narrow opening (22), a valve member (30) is mounted on the side of piston (12) away from the pressure side. Valve member (30) is urged by the force of a spring (36) in a locking position of piston (12) and keeps opening (22) closed. The telescopic damper thereby locks automatically. Exerting an additional manual force on the piston rod can release the self-locking action once more.

Abstract: An actuating mechanism is provided for controlling external devices by means of coaxial actuating cables or other suitable linkages. The actuator includes an internal slide element movable to selected detent positions by means of a lever arm which pushes against the slide when raised. The slide is returned to its starting position by depressing the lever arm. Indicator openings are provided in the body of the actuator permitting visual inspection of the position of the slide to indicate the control setting selected. Use of the actuator to control and position retractable fins or skegs on a water board is also disclosed. The actuator is positioned on the upper surface of the water board just forward of and between the rider's knees and coaxial actuating cables link the actuator to retractable fins on the underside of the board. The actuator can be easily manipulated with one hand to retract or extend the fins quickly. The indicator feature indicates the fin setting selected.

Abstract: A marine vessel propulsion system includes one or more drive systems, each including an engine, an engine throttle, and a shiftable transmission. A control system for each drive system comprises a manually operable control lever assembly for electrically operating a servo assembly which mechanically operates the engine throttle and the transmission shifting clutches. The control lever assembly comprises a one-piece plastic support base which is adapted to pivotally support one or two identical one-piece plastic control levers. Components associated with a control lever are interchangeable and identical and include a potentiometer mechanically interconnected between the control lever and the base, a detent plate and a detent arm. The control lever assembly also comprises based-mounted components including a station selector switch, a mode selector switch, an electrical connector and a flexible circuit board for electrically connecting the potentiometer selector switches and electrical connector.

Abstract: The invention relates to a pressure fluid mechanism comprising: a reaction cam; a cylinder block mounted to rotate relative to the cam and including a central void and an axial extension enabling it to be fixed to a support; and an internal fluid distributor valve constrained to rotate with the cam by a link mechanism which extends inside the central void, the cylinder block and its extension constituting an assembly which is interposed between the cam and the internal fluid distributor valve. According to the invention: a) a braking device is disposed at the end of the mechanism towards which the link device extends, the braking device being disposed between the cylinder block and the cam and including a chamber containing brake disks, which chamber is delimited by a cover; b) the link mechanism is constrained to rotate together with the cover of the chamber containing the disks; and c) the cover of the chamber is constrained to rotate with the cam.