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Publication numberUS3083540 A
Publication typeGrant
Publication dateApr 2, 1963
Filing dateAug 31, 1959
Priority dateAug 31, 1959
Publication numberUS 3083540 A, US 3083540A, US-A-3083540, US3083540 A, US3083540A
InventorsSmith Willard
Original AssigneeSmith Willard
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Boat lift
US 3083540 A
Abstract  available in
Images(2)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

W. SMITH 3,083,540

BOAT LIFT 2 Sheets-Sheet 1 April 2, 1963 Filed Aug. 31, 1959 IN V EN TOR. s M I Tl! A T 70 R/VEYS April 2, 1963 w. SMITH 3,083,540

BOAT LIFT Filed Aug. 3l, 1959 2 Sheets-Sheet 2 INVENTOR. WILL/wo f1/74 United States Patent Willard Smith, RR. 2, Alpena, Mich.

Filed Aug. 3l, 1959, Ser. N 836,993 l Claim. (l. 1-65) This invention relates to the boat lift art, and more particularly to a new and improved boat lift which is portable and provided with a movable roof.

it is an Obie-ct of the present invention to provide a boat lift of this class which is adapted to be hydr ulically operated `and which is provided with a roof that automatically raises for easy boarding of the boat when the boat is lowered into the water, and which lowers over the boat when it is raised out of the water.

lt is another object of the present invention to provide a boat lift of this class which is simple and compact in construction, economical of manufacture, easily operated and highly efficient in use.

It is a further object of this invention to provide a boat lift of this class which is provided with a cradle having a pair of lifting arms which may be elevated to raise a boat clear of the water.

Other obiects, features and advantages of this invention will be apparent from the following etailed description `and appended claim, reference being had to the accompanying drawings forming a part of the specification wherein like reference numerals designate correspending parts of the several views.

In the drawings:

FlG. 1 is a front perspective view of a boat lift made in accordance with the principles of the invention, and showing the roof in a raised position;

FIG. 2 is a rear perspective View of the structure illustrated in HG. l, and showing the roof in a lowered position;

FIG. 3 is a left side elevational view of the structure illustrated in FIG. l; and,

FIG. 4 is an enlarged, fragmentary elevational view of the structure illustrated in PEG. 2, taken along the line 4 4 thereof and looking in the direction of the arrows.

Referring now to the drawings, and in particular to FIGS. l and 2, a preferred embodiment of the invention is shown and includes a front transverse supporting structure including the transverse vertically spaced apart tubes l@ and ll which are xedly interconnected by a plurality of laterally spaced apart tubes as l2. The transverse tubes 19 and il are iixedly connected at their ends, as by Welding, to the vertical front standards i3 and l which are preferably formed from a tubular member.

As shown in FlG. l, the vertical standard i3 is slidably supported on the telescopically mounted rod l5 which is ixedly mounted on the plate l which is in turn supported by the roller i7. The standard i3 may be adjusted to any desired vertical position relative to the rod l5 by means of the set screw i8. The vertical standard lliis slidaoly mounted on the vertical rod i9 which is telescopically received in the lower end of the standard 14 and which is ixedly carried by the plate 2d. The plate Ztl is carried by the roller 2l, and the standard ld is adapted to be secured in an adjusted position relative to the rod i9, by means of the set screw 22.

The boat lift of the present invention further includes a rear transverse supporting frame comprising the transverse vertically spaced apart tubular members Z3 and 24 which are fixedly interconnected by means of a plurality of laterally spaced apart vertical braces as 25. The ends of the transverse tubes 23 and 24 are iixedly connected to the rear vertical standards 26 and 27 as by means of welding. As shown in FlG. 2, the standard 25 is vertically adjustably mounted on the rod "D which is hired 3,' 83,54@ Patented Apr. 2, 19:33

ICC

on the plate 2@ which is in turn carried by the roller Sil. The standard 26 is held in a desired adjusted position relative to the rod 2d by means of the set screw 3l. The vertical standard 27 is slidably adjustably mounted on the vertical rod 32 which is fixed on the plate 33 which is in turn mounted on the roller 34. The standard 27 is adapted to be adjustably secured to the rod 32 by means of the set screw As shown in FlGS. 1 and 2, the boat lift supporting fratrie further includes the left longitudinal supporting structure, including the longitudinally disposed vertically spaced apart tubes 3d, 37 and 3S which are iixedly interconnected by means of the vertical braces 39 and 4d. The braces 39 are mounted between the tubes 35 and 37, and the braces it? are mounted between the tubes 3'7 and 35. The rear ends of the tubes 3o', 37 and 38 are xedly connected to the vertical standard Z5 by any suitable means, as by welding. The front ends of the tubes 36, 37 and 3S are iixediy connected to the left front standard ift by any suitable means, as by welding.

As shown in FIGS. 3 and 4, the boat lifting frame further includes the right side longitudinal supporting structure, including the longitudinally disposed vertically spaced apart tubes All, 42 and d3 which are iixedly interconnected by means of the vertical braces lidand 45. The braces dfi are mounted between the tubes il and 42, and the braces d are mounted between the tubes 42 and 43. The rear ends of the tubes Atl, 42 and i3 are fixedly connected to the vertical standard 27 by any suitable eans, as by welding. The front ends of the tubes di, 42 and 43 are fxedly connected to the right front standard 13 by any suitable means, as by welding. The boat lift structure is further strengthened by the horizontal cross braces 46 and 47 which are xedly connected at their cross over point by means of a suitable bolt and nut means indicated by the numeral The ends of the cross braces do and 47 are suitably xedly connected to the longitudinal tubes 36 and si by any suitable means, as by the bolt and nut means indicated by the numeral 49.

The boat lift of the present invention includes a boat cradle comprising the transverse rockably mounted tubular shafts Sti and 5l. The shafts 5% and 51 are rockahly mounted at each end thereof between the tubes 37 and 38, and dit and 42, respectively, by any suitable means, as by the U-shaped bearing members 52 which are made from flat plate material and welded to the standards at each corner of the boat lift. As shown in FIGS. l and 2, a pair of laterally spaced apart lifting arms 5d and 55 re xedly connected at the lower ends thereof to the shaft Sti, and these arms are provided on the upper end thereof with the sleeves 56 and 57, respectively. Rotatably mounted through the sleeves 56 and 57 is the shaft 53 which is retained in the sleeves by means of Cotter keys as S9. The shaft is adapted to carry a pair of bow blocks as 6i) and 6l for supporting the front end of a boat as 62 in the usual manner. iihe blocks 69 and are pivotally mounted on a pair of U-shaped brackets 63 and 64. which are xedly connected to the supporting sleeves 65 and 56. The sleeves e5 and ed are xedly secured to the shaft 58 by means of the set screws 67 and 63, respectively. The sleeves 65 and 6o may thus be adjusted sidewardly as desired for diiferent size boats.

As shown in FIG. 2, a rear pair of lifting arms 59 are edly mounted at the lower ends thereof on the shaft Si and are provided on the upper ends thereof with the sleeves 'tl and 7l. Rotatably mounted in the sleeves 'itl and 7i is the horizontal transverse shaft 72 which is retained in said sleeves by means of Cotter keys as indicated by the numeral 73. Fivedly mounted on the shaft 72 is a pair of stern blocks as 7d for supporting the stern of the boat 62. The blocks 74 are suitably xed to the shaft 72, as by means of the bolts 75. The front and rear transverse shafts 58 `and 72 are lixedly interconnected by means of the longitudinally extended shaft 76 through the fittings 77. It will be seen that asrthe shafts 50 and 51 are rotated, the boat 62 will be lifted from the lowered position shown in FIGS. l and 3 to the raised 'or storage position shown in FIG. 2, as more fully described hereinafter. Y

The means for rocking the boat cradle includes the pair of levers 78 and 79 which'a're iixedly connected at the lower ends thereof vto the shafts 59 and 51, respectively. The upper ends of the levers 7 S and 7 9 are interconnected by means of the connecting rod Si) which is hingedly connected to these levers by means of the pivot pins S1 and 82. It will be seen that when one of the shafts 50 and 52 is rocked, the other will be correspondingly rocked. As shown in FIGS. 2 and 4, a -pair of spaced apart levers 873 and 84 are connected at the lower ends thereof to the extended shaft 51. Hingedly connected lto the levers 83 and l84, by means ofthe pin 85, is the actuating arm 86. The upper-'end of the arm S6 is formed into spaced apart portions 8-7 and 8S which are pivotally mounted on` the upper ends thereof to the cross shaft 89. The shaft S9 is ixedly connected to the cylinder rod 90 of a conventional hydraulic cylinder or hydraulic jack. yThe jack 91 is manually operable in the usual manner by means of the handle 92'.

As shown in FIGS. 2 and 3, a plurality of horizontal tubes 93, 94 and 95 are welded to the longitudinal tube 43. The tubes 93, 94 and 95 extend outwardly and are supported by the diagonal braces 96, 97 and 9S. The tubes 93, 94 and 95 are adapted to support an operators platform or plank 99. A pair of horizontal outwardly extended tubes 100 and 101 are also welded to the rear end of the longitudinal tube `43 and have fixed therebetween a longitudinal plate 102 to provide a supporting means for the jack 91. The arm portions S7 and 8S pass on either side of the'plate 102. The tubes 100' and 191 are lbraced by the longitudinal tube v103 and the diagonal braces 104 and 105.

As shown in FIGS. l and 3, the boat lift includes `a ro'of which comprises a frame having the outer side tubular rails 106 and 107 which are inter-connected by a plurality of curved or arcuate tubular cross members asV 108. The frame is covered with any Suitable material 109, as canvas, aluminum or any other suitable lightweight material. The roof is rockably supported by the following described structure. The longitudinal tube 106 is rockably supported in the sleeve 110 which is fixed on the rod 111 which is a'dj'ustably mounted in the upper end of the standard 14 by means of the set screw 112. 'Ihe longitudinal tube 106V is also rockably supported at the rear end thereof by means of the sleeve 113 which is Xed on the shaft 114 which is adjustably mounted in the standard 26 by' means of the setv screw 115. Additional support for theY tubular rail 106 is provided by the sleeves 116 and 11S which are xedly connected to the rods 111 and 114 by means ofthe arms 117 and 119, respectively.

The roof is adapted to be rocked or pivoted about the longitudinal tube 106 as an axle by means of the following structure. A rock lever 120 is xedly connected at one end thereof, by means of therbolt and nut means 121, to the boat cradle rock lever 79. The other end of the lever 120 is hingedly connected to the link 122 by means of the pin 123 at the *lower end of the link 122. The upper end of the link 122 is hingedly connected by means of the pin 1245 to the tube 125 in the upper end of which is adjustably slidably mounted the rod 126. The rod 126 is adapted to be iixed in the tube 125 in anV adjusted desired v position by means of the set screw 1:27. The upper end of the -rod 126 is hingedly connected to the sleeve 128 by means of the integral plate 129 and pin 130. The sleeve 128 is rockably mounted on Vthe roof longitudinal tubular rail 107. The front side of the roof is similarly connected tothe front boat cradle rock lever 78. As shown in FIGS.

' parts are adjustably secured together by means of the set v loading position when said shafts are moved in the other Y screw 138. The upper end of the rod 137 is hingedly connected to the sleeve 139 by means of the integral Vplate 140 and the pin 141. The sleeve 139 is rockably mountedV with the Ushaped rest 145 for the reception of the frontV end of the tubular roof rail 107. The rod 144 is adjustably secured in the sleeve 143 lby means of the set screw 146.

In operation, the roof will be in the vlowered positionV when the boat is in the raised position, as shown in FIG.

2. ln this position the hydraulic pump 191 has been Y actuated to raise the arm 86 upwardly whereby Vthe cradle levers 78 and 79 are rocked upwardly, whichin turn swings the lifting arms of the cradle upwardly. During such action the arms and 131 of the roof actuating structure will be swung downwardly whereby the links 122 and 123 will also be swung downwardly to rock the roof to its lowered position. When the jack 91 isoperated to lower the arm 36, the boat cradle will be rocked to its lowered position and simultaneously the roof lifting levers 120, 131 and the links 122 and 133 will be moved upwardly and the roof will be rocked to the raised position shown in FIGS. 1 and 3, whereby the boat may be boarded with ease. Experience has shown that the boat lift of the present invention is ecient in Operation and is easy to use.

While it will be apparent that thepreferred embodifair meaning of the subjoined claim. Forrexample, the" rollers' on the lower ends of the standards may be deleted and suitable skid pads may be substituted therefor.

What I claim is:

Ina boat lift device of the class described, the combination comprising: a supporting frame; a pair of longitudinally spaced apart, transversely disposed horizontal shafts rotatably mounted on said supporting frame at oppof site ends thereof; a boat cradle connected to said shafts and movable from a lowered boat loadingrpositionlto a raised boat storage position when saidshaf't's are rotatedv in one direction and movable back to the loweredl boat direction; said supporting frame beingrmounted on a pluf rality of supporting legs which are adjustable in length tc adjust the supporting frame upwardly and downwardly relative to the level of the water into which'a boatis to be taken from or launched into; a first pair of lvertical standards ixedly connected to said supporting fratrieV along one side thereof and at spaced apart longitudinal positions; a'rod adjustably mounted in the upper end of each of said first pair of vertical standards; a roof pivotally connected at one side thereof to the upper ends of said last mentioned rods and extendingv over said cradle; a second pair of vertical standards disposed along the other side of said cradle in longitudinally spaced apart positions; a second pair of rods adjustably mounted inthe upper ends of said last mentioned pair of standards; the other side ofV said roof being pivotally connected to the upper ends of said' last mentioned pair of rods; a rst lever iixedly connected 5 at the lower end thereof to one of said transverse shafts and at the upper end thereof to the lower end of one of said last mentioned pair of vertical standards; a second lever having the lower end thereof xedly connected to the other shaft and the upper end thereof pivotally connected to the lower end of the other of said last mentioned pair of vertical standards; a third lever having one end thereof iixedly connected to a separate one of said shafts and at au angular position rotated apart from said first and second levers; a hydraulic jack; and a jack lever having the upper end thereof connected to said hydraulic jack and the lower end thereof hingedly connected to the outer end of said third lever, whereby when said hydraulic jack is operated upwardly, said third lever will rotate said transverse shafts to raise said boat cradle and said rst and second levers will be moved to lower the second pair of vertical standards, whereby said roof will be pivoted downwardly at said other side about said one side, and when said hydraulic jack is operated downwardly, the transverse shafts will be rotated in the opposite direction to lower the boat cradle and raise the roof.

References Cited in the ile of this patent UNITED STATES PATENTS 2,708,346 Smith May 17, 1955 2,902,184 Buckner Sept. l, 1959

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2708346 *Jun 9, 1954May 17, 1955Lucius N SmithBoat dock
US2902184 *May 6, 1957Sep 1, 1959Buckner Jewell ABoat hoist
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3216704 *Dec 30, 1963Nov 9, 1965Russell B SmithBoat hoist
US3220196 *Feb 12, 1963Nov 30, 1965Harry W SchollardBoat dock
US3857248 *Mar 8, 1973Dec 31, 1974Rutter HPlatform leveling device
US4787327 *Feb 26, 1987Nov 29, 1988Porter Glenn ALift for marine craft
US5564450 *Apr 3, 1995Oct 15, 1996Sokoloski; Mark A.Umbrella repair device
US5573026 *Mar 29, 1995Nov 12, 1996Griffith; GaryBoat lift canopy
US5769105 *Oct 6, 1997Jun 23, 1998Margol; GeoffreyStationary boat cover
US5890835 *Aug 14, 1997Apr 6, 1999Dethmers Manufacturing CompanyHydraulic lift for boats
US6102059 *Jul 7, 1998Aug 15, 2000Miller; Steven M.Movable vehicle cover
US6688252Dec 11, 2002Feb 10, 2004Gary CaravellaBoat cover
US7353769Aug 17, 2006Apr 8, 2008Unrast Robert ECantilever cover
US7373897Jan 19, 2006May 20, 2008I3 VenturesCover system for a boat
US7520240Jan 21, 2005Apr 21, 2009Tufte Brian NCover system for a boat
US7527014 *Dec 23, 2004May 5, 2009Sunstream CorporationSelf-adjusting watercraft canopy
US7784420Aug 31, 2010Tufte Brian NCover system for a boat
US8397659 *Feb 5, 2010Mar 19, 2013Dennis H. NastromBoat lift canopy entrance
US8602043 *Apr 27, 2011Dec 10, 2013Daniel J. KaiserBoat storage canopy apparatus for boats with wake board towers
US20050016438 *Jun 14, 2004Jan 27, 2005Sunstream CorporationWatercraft canopy
US20050089375 *Oct 11, 2004Apr 28, 2005Fox Robert J.Boat cover
US20050139141 *Dec 23, 2004Jun 30, 2005Sunstream CorporationSelf-adjusting watercraft canopy
US20060162640 *Jan 21, 2005Jul 27, 2006Tufte Brian NCover system for a boat
US20060162641 *Jan 19, 2006Jul 27, 2006Tufte Brian NCover system for a boat
US20070068634 *Aug 17, 2006Mar 29, 2007Unrast Robert ECantilever cover
US20080141926 *Feb 26, 2008Jun 19, 2008Tufte Brian NCover system for a boat
US20090178605 *Mar 25, 2009Jul 16, 2009Tufte Brian NCover system for a boat
US20110290292 *Dec 1, 2011Kaiser Daniel JBoat storage canopy apparatus for boats with wake board towers
US20140026804 *Jul 14, 2013Jan 30, 2014Michael David TempletonBoat canopy
Classifications
U.S. Classification405/3, 414/680, 114/263
International ClassificationE02C5/00, B63B9/00
Cooperative ClassificationE02C5/00, B63B9/00, B63B2737/00
European ClassificationB63B9/00, E02C5/00