US3898948A

US3898948A - Mast handling

Info

Publication number: US3898948A
Application number: US482080A
Authority: US
Inventors: Thomas R Huff
Original assignee: Individual
Current assignee: Individual
Priority date: 1974-06-24
Filing date: 1974-06-24
Publication date: 1975-08-12
Anticipated expiration: 1992-08-12

Abstract

A safety-enhancing mast-handling arrangement for a catamaran or other sailboat with a dismountable mast. Detachable rigid steadying braces are pivotally secured at one end to the deck athwart the foot of the mast and at the opposite end are secured together in sliding engagement with the mast. With the boat supported on a trailer the mast is raised and lowered by taking up and paying out a line attached to the forestay of the mast, as by means of a winch mounted forward on an upright of the trailer.

Description

United States Patent [1 1 Huff [ Aug. 12, 1975 MAST HANDLING [76] Inventor:

[22] Filed:

Thomas R. Huff, 60 Paoli Pk., Paoli,

June 24, 1974 [21] Appl. No.: 482,080

[52] U5. Cl. 114/91 [51] Int. C1. B63B 15/00 [58] Field of Search 114/90, 91, 93, 39, 61, 114/102; 9/1 T; 280/414 R [56] References Cited UNITED STATES PATENTS 3,141,435 7/1964 Moffitt 114/90 3,507,240 4/1970 Butler 114/90 X 3,678,876 7/1972 Alter.... 114/102 3,827,386 8/1974 Faden 114/9] FOREIGN PATENTS OR APPLlCATlONS Canada 280/414 R Primary ExaminerTrygve M. Blix Assistant ExaminerGregory W. OConnor Attorney, Agent, or FirmCharles A. McClure 57] ABSTRACT A safety-enhancing mast-handling arrangement for a catamaran or other sailboat with a dismountable mast. Detachable rigid steadying braces are pivotally secured at one end to the deck athwart the foot of the mast and at the opposite end are secured together in sliding engagement with the mast. With the boat supported on a trailer the mast is raised and lowered by taking up and paying out a line attached to the forestay of the mast, as by means of a winch mounted forward on an upright of the trailer.

3 Claims, 15 Drawing Figures PATENTED AUG '1 2 I975 SHEET PATENTEB AUG 1 2l975 PATENTEB M181 2 I975 SHEET MAST HANDLING This invention relates to safe handling of a dismountable mast, such as the conventional mast of a catamaran or other sailboat while being raised from or lowered to substantially horizontal stowed position.

Even relatively light dismountable masts such as are usually provided for use on catamarans and other sailboats are difficult to handle, especially alone. Being several times the height of a person, such a mast is likely to topple sideways when only partly raised toward or lowered from erect position, with consequent hazard of personal injury and risk of damage to the craft. The step into which the foot of the mast fits accommodates swivelling of the erect mast through a limited acute angle to either side but permits stowage in an essentially aft direction only. Even when more than one person is available to assist in handling the mast there is a need for increased safety during its raising or lower- A primary object of the present invention is lateral steadying of the mast of a sailboat intermediate the stowed and erect positions thereof.

Another object is facilitating the raising and lowering of the mast of a trailered boat.

A further object is provision of means for accomplishing the foregoing objects.

Other objects of this invention, together with means and methods for attaining the various objects, will be apparent from the following description and the accompanying diagrams of a preferred embodiment, which is presented by way of example rather than limitation.

FIG. 1 is a side elevation of a trailered catamaran with the mast stowed, and

FIG. 2 is a plan view of the foregoing.

FIG. 3 is a side elevation, on an enlarged scale, of the mast foot and step (partly in section), taken at III--lII on FIG. 2;

FIG. 4 is a sectional elevation through a jib sheet track and supporting frame member, taken at IV-IV on FIG. 2;

FIG. 5 is a view of a brace assembly of this invention including a pair of steadying braces joined to a slider at one end and with their opposite ends juxtaposed to jib sheet tracks shown in phantom;

FIG. 6 is an end elevation of the slider at the joined end of the steadying braces, taken at VIVI on FIG. 5, with the mast and the brace bodies shown in phantom;

FIG. 7 is an end elevation of the opposite end of one of the braces, taken at VII-VII on FIG. 5; and

FIG. 8 is an elevation of the same brace end as shown in FIG. 7, taken transversely thereto at VIIIVIII thereon.

FIG. 9 is a side elevation of the trailered boat of FIG. 1 with the mast propped up somewhat from the horizontal and with the steadying braces installed;

FIG. 10 is a bottom plan of longitudinal grooving of the mast, taken at X-X on FIG. 9;

, FIG. 11 is a transverse section through the mastand groove, taken at XI--XI on FIG. 10;

FIG. 12 is a side elevation of the trailered boat, with the braced mast shown more than half erected;

FIG. 13 is a rear elevation, partly oblique, of the boat with the braced mast partly erected as in FIG. 12, taken at XIII-XIII thereon;

FIG. 14 is a side e levation of the same boat with the mast erect and the steadying braces removed; and

FIG. 15 is a front elevation corresponding to FIG. 13, showing attachment of the forestay to the bridle between the bows.

In general, the objects of the present invention are accomplished, in a mast-handling arrangement for a sailboat with a dismountable mast, by means of a rigid brace assembly adapted to be pivotally secured at one end to the deck athwart the foot of the mast and adapted at the opposite end to fit in sliding engagement with the mast.

More particularly, the invention extends to erecting a dismountable mast of a sailboat, especially one having a step adapted to retain the foot thereof when the mast is in a substantially horizontal stowed position aft of the step, as well as when the mast is erect, the mast being provided with a forestay, by taking up the forestay from a forward location above the level of the step and thereby raising the mast, via a fulcrum not located on the boat, and meanwhile steadying the mast laterally by interposing from fixed locations on the deck athwart the mast to the mast itself a pair, of rigid braces and pivotally connecting them to the deck and connecting them together and slidably relative to the mast. Advantageously the fulcrum for the forestay is located on an upright of a trailer upon which the boat is transported, as to and from a body of water suitable for sailing craft.

In the diagrams reference numerals are used to designate apparatus components for clarity of the description, which follows. Where such components occur in multiples, as quite a few of them do, the same numeral may be assigned to each. However, in the instance of paired components, further clarity is assured by priming the numeral referring to one of the paired members (the after member in a fore-and-aft pair, and the portside member in a lateral pair) and leaving unprimed the same numeral for the other member in the pair.

FIGS. 1 and 2 show, in side elevation and plan, respectively, apparatus of the present invention adapted to use with a trailered catamaran. Trailer 10 is shown supporting catamaran 20 in conventional fashion, with mast 21 stowed in horizontal position extending aft from dismounted engagement with step 24, which itself is also adapted to hold the foot of the mast when erect. It should be understood that when the boat is being transported on the trailer the mast is preferably carried completely disengaged from the step and secured, as by being tied, to the boat frame and the trailer upright so as to extend forward over the vehicle pulling the trailer and thereby minimize its projection astern.

Trailer 10 comprises supporting frame 11 of generally rectangular plan with a V-brace 12 at the forward end and drawbar 13 extending from the apex thereof and here shown resting on block 15 at its forward end. Leaf spring 17 depending from the frame carries pair of wheels 18, 18' at opposite end of axle 19 for rolling movement over the ground. Pair of supports 16, 16' extending laterally upon the frame cradle hulls 22, 22' of the catamaran on the opposite end portions of the supports. Forward support 16 is located about midway of the hulls, while aft support 16 is another quarter of the way or so toward the stern.

A deck frame having a generally rectangular plan comprises pair of laterally extending frame members 26, 26' and pair of longitudinally extending frame members 28, 28' joined by fittings 29 L-shaped in plan at the corners. The frame is supported on the hulls by pairs of post portions underlying the L portions of the fittings and secured at their lower ends to the hulls. Forward lateral frame member 26 has step 24 mounted midway thereon and carries jib sheet tracks 34, 34' on the upper surface of its opposite end portions. The mast, which is secured at its foot in the step rests upon the mid portion of after lateral member 26' in the illustrated stowed position. Pulley 23 at the peak of the mast accommodates a mainsail halyard (not shown).

Upstanding from the apex of V-member 12 of the trailer frame is upright 32, which carries pulley 33 at its upper end and winch 31 mounted therebelow. Winch line 35 is secured detachably by clip 36 to forestay 37, which itself is secured at its opposite end in conventional fashion to the mast, together with

sidestays

38, 38 extending from the mast to points of attachment to

respective hulls

22, 22. The upright is raked to place the winch forward of the pulley, whereupon the pulley is substantially aligned between the winch and the attachment of the forestay to the mast when erect, as shown subsequently.

FIG. 3 shows the foot portion of mast 21 dismounted from step 24 butwith hook 42 protruding from the foot engaged with horizontal pin 44 affixed to the after part of the step, in the dismounted position of the preceding views. Exposed ball 41 of the foot is adapted to fit into socket 45 of the step when the mast is stepped. Shoulder 47 on the forward rim of the step is adapted to engage protruding part 46 of the step casting to limit the extent of swivelling of the erect mast.

FIG. 4 shows jib sheet track 34 on forward lateral frame member 26 sectioned from FIG. 2 and considerably enlarged. A threaded nut 48 is retained in channel member 49, which has a lazy C configuration in transverse section.

FIG. shows pair of steadying braces 50, 50' oriented schematically rather than in normal use position as shown subsequently. At one end the braces have

end fittings

51, 51 pinned thereto and terminated in hollow hemispherical ends, themselves joined together by headed pin 53 and retainer ring 55 through an opening in the free end of the pin, which has washer 54 thereon. Sandwiched between the hemispherical ends of the fittings is flange 61 of slider 60, which is shown further in the next view.

FIG. 6 shows slider 60 sectioned from FIG. 5 and further enlarged. Centered on the opposite side of crosspiece 62 from flange 61 is beaded flange 63, the bead of which fits slidably in a complementary groovefor the luff rope of the mainsailin the mast (shown here in phantom) as further illustrated in subsequent views.

Also in FIG. 5, at their opposite ends the respective braces have

clevis fittings

58, 58 and pins 57, 57' pivotally retaining L-shaped

feet members

59, 59. Detents 68 68' from the respective feet fit into the corresponding jib sheet tracks 34, 34 (shown in phantom). Not shown here are screws for securing the feet to the threaded nuts in the tracks.

FIGS. 7 and 8 show detent 68 of foot 59 of brace 50 fitting into channel member 49 (here shown in solid) of jib sheet track 34 on forward lateral frame member 26 (cf. FIG. 4). Thumb screw 69 threaded into nut 70 retained in the channel member secures the foot to the track.

FIG. shows, looking forward, part of the aft surface of mast 21, which has luff rope groove 71 extending longitudinally thereof, erupting to the surface throughout its length. This view is indicated obliquely upward in FIG. 9, in which the mast is raised a bit from the horizontal, as discussed further below. Over part of the illustrated length the groove eruption is enlarged to the full width of the groove, the enlarged part being designated 72, whereas over the rest of the groove length the width of the erupted part is a minor fraction of the groove width, as shown in the sectional view in FIG. 11.

The practice of this invention is readily understood from the foregoing description and diagrams. It is convenient to assume complete preassembly of the brace assembly (usually called simply the braces), here comprising slider 60, pair of braces 50, 50', angled feet members 59, 59', pins 57, 57' securing the lower ends of the braces to the feet members, and pin and

ring

53 and 55 securing the upper ends of the pair of braces to the slider and, thus, together. Whereas the former pins have not been disclosed as detachable they may be modified in obvious fashion to be so, and while the latter pin is disclosed as detachable it need not be. When respective components are detachable from one another installation of the brace assembly may occur in no particular sequence of operations, but when preassembled a single sequence is prescribed, as follows.

With the mast in the illustrated stowed position, or optionally in completely disengaged position as for transporting, the bead flange of the slider is inserted into the luff rope groove via the enlargement and is slid somewhat toward the peak of the mast so as to remain in engagement therewith. Then the feet members are juxtaposed to the respective jib sheet tracks (with the mast foot hooked to the step or close enough thereto to do so) and, with the detents inserted therein, are secured in place by tightening the thumb screws in threaded engagement with the nuts retained in the tracks.

Alternatively, when the slider is disengageable from the upper ends of the braces, as illustrated, the feet members can be secured to the tracks at any time, and the slider be engaged with the groove in the mast at any time or at any distance of the mast foot from the step, and the brace ends and slider be pinned together when the mast is ready to be raised. However, as disassembly of the components of the brace assembly is readily avoidable, and pinning of the components together may be inconvenient when they are desirably closefitting, complete preassembly of the brace assembly before installation is generally preferable.

Once the brace assembly is in place, the free end of the mast is raised somewhat, as may be done manually by a single person, to facilitate subsequent winching of it upward. If the entire operation is being conducted by one person it is convenient to prop the mast in such position. The upper end of the prop may be tapered to enter the groove eruption sufficiently to be retained in place, preferably resiliently as by a rubber tip. It may be permitted to fall free upon winching of the mast further upward or preferably may have a transverse bead on the tip so that a quarter turn of the prop after the tip has entered the groove will retain it therein (much as the beaded flange of the slider shown in FIG. 6 is retained) until released therefrom by another quarter turn. From the position shown in FIG. 9 the mast is readily raised by turning the handle of the winch to take up the line attached to the forestay and thereby apply raising force to the mast, care being taken to see that the ball on the foot of the mast seats in the socket of the step. S0 installed, the mast is raised by further winching of the line and forestay. FIG. 12 shows the mast about two-thirds raised. Of course, the prop has been removed before reaching this position.

FIG. 9 shows prop 75 with its upper end inserted in the rope groove and its lower end on the ground, in such location as to incline the mast upward from the step at a minor acute angle, such as 20i10 to the horizontal.

It is quite obvious that, during any change in angle of inclination of the mast, the clevis-like lower ends of the braces rotateabout the interconnecting pins--relative to the feet members secured to the deck, which themselves may be non-horizontal so long as the axes of rotation are horizontal, as such axes must be perpendicular to the plane swept out by the mast as it is raised or lowered. Not so apparent perhaps is the fact that, inasmuch as the braces and the mast rotate about non-aligned centers, the locus of engagement of the brace assembly with the mast (via the slider) must move somewhat lengthwise of the mast, as can be observed during the raising and lowering thereof. The hemispherical end parts of the upper ends of the braces flanking the slider accommodate any minor misalignment, as by limited swivelling of the mast during such operation.

FIG. 13 shows the bracing of the mast in a view taken looking obliquely upward and forward as indicated on the preceding view. The hulls and lateral side members are sectioned, and the upper portion of the mast is omitted to conserve space.

FIG. 14 shows the mast in fully erect or upright position as attained by further winching. At this stage the side stays are taut, and the brace assembly removed by unfastening the feet members from the jib sheet tracks and then dropping the slider in the mast groove until it can be removed through the enlargement, which is located within a mans reach above the foot of the mast.

FIG. 15 shows the bow portion at the stage shown from the side in FIG. 14. At this final stage the clip on the end of the forestay is detached from the winch line and attached to the bridle 77 extending upward from junction at its opposite ends to the bows of the respective hulls. Thereupon the catamaran can be removed from the trailer into the water in customary fashion. It will be understood that the catamaran is secured to the trailer by tying it or in other convenient fashion during transportation and throughout raising (or lowering) of the mast.

When it comes time to dismount the mast, the operation just described is reversed, whereupon the braces again steady the mast during the ensuing stages until the mast approaches the horizontal sufficiently that the assembly can be removed with minimal effort and risk. Installation and removal of the braces, whether for raising or lowering of the mast can be accomplished readily in a couple minutes. Once installed, the braces provide more than adequate risk against lateral toppling, thereby greatly enhancing the ease and safety of this operation. Nothing more need be added to the vessel to adapt it to such installation.

If desired, screws at the feet of the braces can be eliminated by substitution of expanding eccentric or cam fittings, but such an alteration would be apparent to persons of ordinary skill, as would substitution of universal joints for the clevis and pin interconnection of the braces and the feet members. Other modifications can be made, as by adding, combining, or subdividing parts or steps, or by substituting equivalents, while retaining principal advantages or benefits of this invention, which itself is defined in the following claims.

The claimed invention is:

1. In a mast-handling arrangement for a sailboat with a dismountable mast having a longitudinal rope groove therein erupting to the exterior therealong, a laterally steadying rigid brace assembly pivotally and detachably attachable at a first end to the deck athwart the foot of the mast and also slidably and disengageably engageable at a second end to the mast and including at the second end a slider fitting within the rope groove.

2. Mast-handling arrangement according to claim I, wherein the sailboat is a catamaran having a forward lateral frame member with jib-sheet tracks secured thereto and wherein the brace assembly is secured detachably at the first end in the respective jib-sheet tracks.

3. Mast-handling arrangement according to claim 1, wherein the eruption of the rope groove is enlarged within a mans reach from the foot of the mast, and via such enlargement the slider is engageable with the rope groove before the brace assembly is secured at the first end to the deck, and is disengageable from the rope groove after the brace assembly is detached at the first end from the deck.

Claims

2. Mast-handling arrangement according to claim 1, wherein the sailboat is a catamaran having a forward lateral frame member with jib-sheet tracks secured thereto and wherein the brace assembly is secured detachably at the first end in the respective jib-sheet tracks.

3. Mast-handling arrangement according to claim 1, wherein the eruption of the rope groove is enlarged within a man''s reach from the foot of the mast, and via such enlargement the slider is engageable with the rope groove before the brace assembly is secured at the first end to the deck, and is disengageable from the rope groove after the brace assembly is detached at the first end from the deck.