US418221A

US418221A - Derrick

Info

Publication number: US418221A
Authority: US
Publication date: 1889-12-31
Anticipated expiration: 1906-12-31

Description

2 Sheets-Sheet 1. W. B. PLESS. DERRICK.

(No Model.)

No. 418,221. Patented Dec.31, 1889.

2 Sheets--Sheet 2.

(No Model.)

W. B. PLESS. DERRICK.

No. 418,221. Patented Dec. 31-, 1889.

WWW S/vwe/WboM /%Q%WU, 7'" $1M wwwwm 6 UNITED STATES PATENT OFFICE VILLIAM B. PLESS, OF STOCKTON, ASSIGN OR OF ONE-HALF SARGENT, OF SAN JOAQUIN, CALIFORNIA.

TO ROSYVELL O.

or other motive power within the hull. Forwardly-extending jaws H are attached to the turn-table and embrace the boom J.

N N are the jaws of the dipper, which is of a clam-shell pattern. a and b are the handles, to which are attached lever-arms c, having eyes at their outer ends. The handles a and b are pivoted at a working center upon a shaft cl. The dipper is suspended by chains 6 o I, attached thereto and to a pulley M, and by chains L, attached to the eyes of the arms A hoisting-chain K is attached at the outer ends of the boom J,

the pulley L, over a sheave lso over a sheave G in the -mast G, then extendsdown ward inside of the at the bottom of is suitably connected to the motive power within the hull. A chain K is 1 end of the boom J and passes through the pulley I] and upward over the sheave J extends reardownward over the sheaves G this specification.

My invention relates to that class of dredgers which are located upon a floating vessel, and the novelty will be fully understood from the following description and claims, when taken in connection with the accompanying Figure 1 is a side elevation of my complete dredging-machine and its vessel. Fig. 2 is a section of the derrick through line X X of Fig. 1. F' enlarged sectional detail view of the derrick-mast and ball-joint. Fig. 4 is a detached plan view of the derrick, turntable, and its arms. may be slacked at once and the dippei low- I A B represents the hull of the vessel, upon ered WVhen the ipper is upon the mud which bot wound, causing the aws are located the operating devices and C is a cross-beam whose ends yond the hull of the vessel.

is the derrick-mast, which is hollow, and has at its lower end a ball-joint composed of a ball G stepped in a socket F in the beam t the head of the mast G, cured thereto, is a gudgeon E placed the eye E of a brace 0, to

extend befor another load.

hat I claim as new and of my invention 1s- 1. The combination, substantially as de scribed, of the hull A B, the hollow mast G, provided with the ball-joint F G at one end and the gudgeon E at the other, the turn-table I, provided with I p and of ends of which are at- Side braces TOO about the mast G, and by means of a rope b I 7 leadlllg he combination, substantially as de to the engine scribed, of the hull A B, the cross-beam C, the

sheave G! mast, an d in the mast the turn-table I, with ing-i'ope, the gudgeon E the bail-joint block E, engaging w supporting carrying the with its eye E engagi G3 beneath the beam G, the mast G, the jaws ith n g With C, the sheave provided with H,and operatat the top of the F G2 at its foot, the

the gndgeon E and braces, the brace 0, the gudg'eon E and the attached to boom the foot of the mast G.

J, attached to the ja WS J,

In testimony whereof I affix m y signature in presence of two Vitn esses:

JOSHUA witnesses.

WILLIAM B. PLESS.

B. WEBSTER,

MAY HOLT.