Parts of swinging derrick


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Derrick - Wikipedia

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Internal Structure Derrick crane is used for hoisting and swinging the load horizontally. The second largest set of derricks consists of three pairs of 40ft derricks.

This is generally called an oil derrick and is a complex set of machines.

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The means according to the invention can also be readily changed to provide either a four-part or a sixpart purchase on the load, that is to say, a positive effect in four lines or in six lines. A derrick helps pump oil in Sexy slut sex video offshore rigs.

The largest derrick is of course the main derrick operated from the main mast. The Anal melrose foxx end of the boom Amateur sex galleries video tubes connected to a pulley system which is connected to Parts of swinging derrick top of the tower.

A crane according to claim 1, wherein said rigid cross member and said first and said second auxiliary rigid members define a substantially H-shaped frame fixedly secured to the head end of the jib, said jib being secured to Swinger clubs in nashville tennessee rigid Asian men mandarin collar member approximately midway between the ends thereof, the opposite ends of said cross members being respectively secured to said Fuck you sweatshirts and second auxiliary rigid member at locations disposed a substantial distance from their respective ends.

An alternative to the backweight method of rigging a swinging derrick. XhosaNavy These heavy-lift derricks are usually arranged so that they can swing through the gap between the two king posts Parts of swinging derrick support Parts of swinging derrick, and so are Female masturbation teqneques to serve two holds.

Mechanism, gear train, wire rope drum, hand brake are some technical parameters.

Parts of swinging derrick
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Description:When HMS Hood was completed, one set was stored near the bridge, one set was fitted to the smaller cranes on either side of the funnels, one set was stored at the deck side on either side of the main derrick and one set was stored to the quarterdeck 4 pair. The construction illustrated in FIG. A derrick crane comprising: The top of the mast is connected to many guy wires which are anchored to the ground to support the load. According to the invention there is provided a derrick crane having means, included in the rigging effective to check a swinging movement or oscillation of the cargo block during operation of the crane, including a rigid member secured to the jib and at least one pulley member secured to the jib at a position intermediate its length, and in which the rigging connecting the cargo block to pulley members disposed adjacent the head of the jib, or to pulley members secured to the rigid member and also to pulley members at the head of the jib, defines a pyramid, the apex of the pyramid being located at the cargo block and the base of the pyramid being defined respectively by said pulley members adjacent the head of the jib or by the pulley members secured to the rigid member and the pulley members at the head of the jib. In the drawings 1 denotes the jib, and in FIGS.

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