US 928766 A
Description (OCR text may contain errors)
W. F. JOHNSTONE. TOWING POST.
APPLIOATIONV'ILED MAR` 26, 1909.
928,766. Mente@ July 2o, 1909.
2 SHEETS-SHEET 1.
W. If. JOHNSTONB. TOWING POST. APLIoAjrIoN FILED MAR. ze, 19'o9,.
Patented July 20.1909.
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'UNIT STATES rires rrorsi-cn.
To all whom 'it may concern:
.Be it known that I, E'ViLsoN F. JonN- STONE, a citizen of the United States, residing at Honolulu, ylerritory of Hanan, have 1ni vented new and useful Improvements in 'lowin f-Posts of which the followiiw is a a s i n specification. 1
This invention relates to nen and useful improvements 'in towingposts especially con l struc'ted for use in harbors and intricate channels where the turns are short and sudden but applicable also to deep sea toning with great advantage.
In order that the novel features of construction and their attendant advantages may be more readily appreciated I v. ill briefly review conditions as they exist at the present time in the towing art and will then set forth wherein my invention overcomes the defects and inadequacies of the devices4 ordinarily employed.
Towing machines are at present located on the deck ofthe tug or in the hold, the tow line passing through a chock, han'se hole or similar device on the tallrail of the tug, this arrangement being necessary for a fair lead to the towinglmachini-s. thus held in'choeks aft, it is impossible to accurately handle the tug and the tow in intricate channels requiring short and sudden turns. F or this reason the. arrangement wherein the towing machine is on deck and the chock aft, can net be used for harbor to. ing but only for deep sea towing. In order to allow of the .tug and her tonA beingl readily handled it essential that the'tor.- ing post be located somewhat abalitv and coinparatively near the center ol'A the tug so that the drag of the tow may not interfere. with the steeragenay ol' the tug. l.it is also essential to the lull control of the tow and to the lille of the tov.' line that the buckling and abrasions to which the tow line is subjected in fair leaders and similar devices as ordinarilyconstructed, be eliminated asiar as possible.
Recognizing the. above defects the present invention was designed for the purpose of overcoming the same and for other purposes as will be hereinafter; ilained.
It will be seen .l'roni the foregoing-that the towing post should 4-be located somewhat abaft and near thc-center of the vessel and that free -play of the towing line should be allowed. 'lho-irst Objectis accomplished by Specification of Letters Patent.
Application filed March 26, 1909.
'l he tow line being4 Patented July 20,-19'09.
Serial No. 485,922.
l. ,locating the. towing machine in the hold of the vessel and by positioning the towing post on the deck abaft and near the center of the tug. rThe second object is accomplished by providing a towing post which is self-adjusting in accordancewith the relative positions of the tug and the tow. Accordingly, the towing post is .mounted for horizontal sn' inging movement and is capable of elliciently turn- Eing through an arc of 180 degrees. Thepresent invention veliminates the necessity of placing checks ory similar devices on the tail'rail and consequently the taflrail is perfectly clear so as not to interfere "w ith ,the movement of the tow line through the-necessary angle. Incidental to this arrangement the straight )ortion of the towing post is-located coaxially with the tow line in the position which the latter assumes when being wound upon or unwound from the reel.
Having conceived a means whereby the above objects could be obtained land the defects and inadequacies of the devices ordinarily employed, eliminated, numerous .dithculties presented themselves which had tobe obviated before an arrangement along the lines generally set forth could be practically used. In order that buckling of the tow-line Amay b e prevented and that the bendingmoments may be as easy aspossibleit is essential that tos.' lines over an inch in diameter .should travel over sheaves forty times the diameter or the tow line. Such a sheave for use with a tow line of standard age would `have a diameter of seven feet an( when employed in connection with a swivelingI earriage and a deck casting` support, thetop of the sheave would be about nine feet-above th.n deck, the arrangement being similar to a gigantic inverted caster. A tug with anord inary l'our it. highltowingpost with a strain aft'line of the vessel will careen twenty degrees; and with the above sheave five feet. l'ngher7 the leverage would be so great that'it 'thehawsen sincethe vessel would be in great to locate the top of a seven ft. sheave the same height fromfthe deck asan ordinary towing` post since this -would necessitate-a sunken lunch. nection would fill with water and dirtlfrom the d'eck and would be a source nl' danger and on the hawser at right angles to the fore and would not be practical to put any strain on A sunken hatch in this conanndvance in a sea wav. My nextthought,`
danger of capsizing. It is also not practical tim angl fm' taking' up ing fue surgi' fr way and Hum. man
il Lr COQ muy which the d Sim-H' prior am um svt propel' detain imm :1, :u pl'm' mh' MMM, punched at U1 @ml prmismu rlmf murospum my' an the towing generaliy as 1;,
were@ ving with a tension on the tow line all the 'time and the post swings with the towline,
accoinrnodating,l itself to any position which the tow line takes when the tug is in motion'. All abrasions and other kinks which the tow line has in the arrangements in which it is readily set up and dismantled and that the vpulleys 13 may be conveniently taken out and replaced for the purposes ol renewal and repairs.
l. A towing post comprising a casing); of curved outline and provided with a liollou' tangentially extended journal und a bearing for the journal.
2 A towing poet comprising a casing of curved outline and provided `with a hollow tangentiallv extended journal, a bearing for the journa and a plurality of closely aseociated pulleys in the casing atl'ording a boaring surface for the tojw' line.
3. A towingI post con'iprising` a casing of curved outline, a swivel bearing for thccasing to allow the latter to swing horizontally, a curved track in the rear of the bearing and a strut arm projecting radially land inwardly from the casing and having a roller engaging the track.
4. A towingpost comprising ucasing oi' curved outline and cfu shape cross. section, a swivel bearing for the casing to allow the lat fully described my invention, l
ter to swing horizontally, and. a plurality ofy closely associated pulleys in the casing aiiording a bearing surl'ace lor the tow line.
ln a towing post construction, in coinhination, a plurality ol closely associated pnl L le vs means icr su )ortiiw the nullo 'e in con .l y n Y.
terininous relation and as an arc-shaped se-` ries, said ineens including a hollowjourniil and swivel bearing for the journal.
6. A towing post comprising a casing of curved outline, a swivel bearing for the cas ing to allow' the latter to swing horizontally, angularly disposed strut arms projecting radially and inwardly from the casing, a curved track in the rear of the bearing and i roller irovidcd on each strut arm and engaging the track.
7. A, towingpost com rising a casing of curved outline, a swivel Bearing for the casing to allow the latter to swing horizontally, and nieans'connected to the casing for relieving the stress incident to the surging 'of the touY line.
8. The combination .yvith a towing post comprising a freely`Y swinging curved casing having e tangentially extended journal, of a base plate for attachmentto the deck and having a bearing for the journal.
i). 'lhe combination `with a towing post comprising n freely swinging curved casing having a tangentially extended journal, of a base plate for attachment to the deck and having an'annular boss through which the journal passes and Ineens for-'holding the journal in the base plate against axialplay.
l0. The combination with a towing post comprising a freely swinging curved casing,l 1 having a tangentially extended journal, of a base plete for attachment to the deck and having a bearing for the journal, acurved track on the base plate in the rear of the bearing 'and en inwardly projecting strut arni carried by the casing and having a roller cngaging ,said track.
.ln testimony whereof l have hereunto set my liand in presence of two subscribing witncssee.
lticimnn ll. 'l`nENT, OLAF li. SonnNsoN.