US2574800A - Swivel - Google Patents

Description

N0v.v13, 1951 K. w. SKLD SWIVEL 2 SHEETS-SHEET 1 Filed May 16, 1949 K. W. SKLD Nov. 13, 1951 SWIVEL 2 SHEETS- SHEET 2 Filed May 16, 1949 Patented Nov. 13,A 1951 NITED STATES -QFPl-C'l.v

` 'Karl W. SkldfRanmas, Sweden application May 16, 1949,-'seria1- No.1,9ae27 In 'Sweden Mayf 2151948 ',Ihefpresent invention relatesto a swivelmi. e. 1a member connectinjgj two jchains lengths nstended tojpermit-turning of one,:.chains'1en'gth frrelatively `the other one without' jamming. This ithefdrawing, :the numeral I designatesra .loop provided-witha :sleeve 2 having internal `-threadscl Ai 41 isy a loopV provided with ax.pivot5. :Saidpivot: isprovided with annularribs `ii. `-Two is/mostlythe case with an anchorLchaimthe .jan-. vfbearing=-halvesl.8, '9: together forming albearing chor 'pa-rt Vof which-anchor with shackle and stray length-efbyz-fmeansiofragswivel is connected withthe long length running over thecapstan .device.

WhenV dropping "the anchor, and also when heaving it, the chain mostly, due to the effect of the current on the anchor nukes, becomes so twisted or turned that it cannot run through the capstan device when hauled in. This may be particularly diicult and time wasting if the anchor has been dropped on deep water with a strong current going. In such cases the hauling must take place in steps with one or two men standing at the chain pipe ready to pry and turn the chain in correct position with iron crows, and of course chain and windlass will have to be stopped while this is performed.

However, said difliculties are remedied to a small degree only by the usual swivel, and therefore many ships are sailing without it. Imperfect function and high prices counteract the otherwise given compulsory use of it.

The grounds for the deliciencies of the customary swivel are to be found in its evidently primitive, friction furthering construction. Thus all pressure and bearing surfaces are completely uncovered and open for corrosion as well as for the entering of particles causing a strong friction, such as sand, mud or the like, according to the nature of the anchor bottom. This in connection with the abnormally high specific surface pressure on the small supporting surface of the pivot head-which carries the weight of the anchor and the stray length-results in a mostly permanent locking of the swivel motion.

The object of the present invention is to eliminate these drawbacks.

The object of the invention is mainly characterized in that around the pivot are mounted two (or more) bearing halves provided with annular flanges entering annular grooves in the pivot, said bearing halves being screwed into the sleeve and being locked against turning relatively same.

The invention is illustrated by an embodiment in the accompanying drawing, in which Fig. 1 is a plan View, partly in section, of a swivel according to the invention. Fig. 2 is a corresponding side view partly in section. Fig. 3 is a section along the line III-III in Fig. 1. Fig. 4 shows some details.

:sleeve-@with internal annulargrooves .'I Vcorref-spon'ding to theribsarel placed around the lpivot ,.rsaid '.bearing halves 1- being provided -Withf ex- .ternfal:threadsv I ily corresponding to the/threadsi, and ibeing; screwedl in-to"l the sleeve '.2 .At` its vtermination towards the loop 4 the pivot 5 has a ange-like part I5 and an annular groove II for a packing I2. In a projection I3 on the sleeve 2 there is made a bore I4 extending along a chord, which bore also traverses one or both bearing halves 8, 9, and a pin I5, which is preferably somewhat bent and resilient and is inserted in the bore, prevents a pushing-out of the bearing halves. In the flange-like part I6 of the pivot 5 is provided a bore (or more bores) I8 extending in the direction of the axis and having internal threads I'I and a flange I9 which protrudes inwardly, and right in front of the bore (or bores) I8 a bore 20 is provided in one bearing half 8 (or in both bearing halves). A screw 2| with an axial pin 22 of a diameter smaller than that of the screw is screwed into the thread I'I. A helical spring 23 is placed around the pin 22 between the ange I9 and the screw 2l. At the mouth of the bore I8 center punch marks 24 are provided to prevent the screw from being screwed completely out. Directional marks 25 are provided in the flange-like part I6 of the pivot and in the sleeve 2 for indicating the relative angular position between the pivot 5 and the sleeve 2 or the bearing half 8 at which the bore 20 is located right in front of the bore I8.

In the sleeve 2 there is turned out a relatively large cavity 26 which constitutes a container for relatively highly liquid oil with a low point of solidication. Axial channels 2'I are provided in the interior of the sleeve 2, and holes 28 and 29 respectively are bored in the bearing halves 8, 9 and in the pivot 5 to permit oil from the cavity 2B to float to the dierent bearing surfaces.

At the manufacture the swivel is assembled in the following way. The two bearing halves 8, 9 are placed around the pivot 5 of the loop 5, whereupon the screw 2| is screwed in so that the pin 22 enters the recess 20 in the bearing half 8, which for instance by means of grooves 2l is marked to show the position relatively the screw 22. The latter then serves as a clawwrench for the tightening of the bearing halves against the sleeve l. Then the hole I 4 is bored and reamed and the locking pin l5 is driven in so that the bearing halves 8, 9 are immovably locked to the sleeve I. The directional marks 25 are then provided. Finally, the screw 2| is screwed up so far as permitted by the centre punch marks 24, whereby the pivot 5 becomes rotatable relatively the sleeve I. The screw spring 23 secures that the screw 2| cannot tighten in the bore 20 again on account of shakings.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

A swivel comprising a loop formed with an in- Y ternally threaded sleeve integral therewith, a second loop formed with an integral pivot which extends into and is rotatable relative to said sleeve, a pair of externally threaded bearing halves dis-y posed in an interspace between the sleeve and which elongation of the screw is engageable with a bore in the end of one of the bearing halves to lock the bearing halves and said second loop against rotation, and a coil spring surrounding said elongation of the screw and engaging the head thereof tending to prevent it from engaging the end of the bearing half and guiding the screw in the lateral direction in the bore.

KARL W. sKLD.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number l Name Date 183,750 Cliiord Oct. 31, 1876 521,942 Swan June 26, 1894 847,152 Beebe Mar. 12, 1907 879,644 Jeiries et a1. Feb. 18, 1908 913,056 Rounds Feb. 23, 1909 Y 931,270 Clarkson Aug. 17, 1909 1,468,579 Scanlen et al Sept. 18, 1923 2,246,588 Harrall June 24, 1941 2,429,929 Fisher Oct. 28, 1947 2,519,460 Hansen Aug. 22, 1948 FOREIGN PATENTS Number Country Date 439,986 Great Britain Dec. 18, 1935

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