U.S. patent number 3,675,258 [Application Number 05/083,265] was granted by the patent office on 1972-07-11 for boat hoist.
Invention is credited to Bradley M. Osmundson.
United States Patent |
3,675,258 |
Osmundson |
July 11, 1972 |
BOAT HOIST
Abstract
A boat hoist for launching a boat and for removing it from the
water. This hoist includes a scissor-type extensible and
retractable arm assembly connected at one end to a support platform
for a boat. The entire supporting structure for the hoist is
mounted upon the shore and the other end of the scissor assembly is
operatively secured to the shore mounted support. The extension of
the scissor assembly projects the boat platform over the water and
to a prescribed depth therein and the retraction of the arms
elevates the boat platform from the water towards the shore support
where the boat can be maintained in a docked position free of the
water.
Inventors: |
Osmundson; Bradley M. (Webster
City, IA) |
Family
ID: |
22177222 |
Appl.
No.: |
05/083,265 |
Filed: |
October 22, 1970 |
Current U.S.
Class: |
114/368; 405/218;
414/678 |
Current CPC
Class: |
B63C
3/06 (20130101) |
Current International
Class: |
B63C
3/06 (20060101); B63C 3/00 (20060101); B63b
023/02 () |
Field of
Search: |
;9/30,31,34,35,36,38,39,41 ;214/1A ;74/521 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Blix; Trygve M.
Claims
I claim:
1. A boat hoist, comprising:
a support frame,
means mounting said frame directly on the shore closely adjacent a
body of water,
an elongated boat support member disposed longitudinally over and
above the body of water,
said boat support member having respective inner and outer ends
with said inner end being oriented in relatively close relationship
to said support frame,
an extensible and retractable arm assembly operatively secured at
respective opposite ends to said support frame and to said inner
end of said boat support member,
means on said support frame operatively connected to said arm
assembly to selectively effect the extension thereof away from the
shore over and downwardly towards the water and the retraction
thereof upwardly relative to the water and towards the shore and
said support frame,
the directional movements of said arm assembly relative to the
water and shore effecting corresponding movements of said boat
support member so that the extension of said arm assembly acts to
project said boat support member in a direction away from the shore
and into the water to a predetermined depth, and
the retraction of said arm assembly acts to elevate said boat
support member and move it in a direction toward the shore to a
predetermined plane above the level of the water adjacent the
shore.
2. A boat hoist as defined in claim 1 including:
said support frame being vertically disposed, and
means attaching said support frame on the shore to permit of its
vertical adjustment relative to the level of an adjacent body of
water.
3. A boat hoist as defined in claim 1 including:
said arm assembly comprising:
a scissor arm unit including a pair of elongated rigid arms
pivotally connected at their longitudinal center and having their
opposite ends operatively connected respectively to said support
frame and said boat support member.
4. A boat hoist as defined in claim 1 including:
said arm assembly comprising:
a scissor arm unit including a pair of elongated rigid arms
pivotally connected at their longitudinal center and having at each
opposite extremity a pair of end members defining an upper end and
a lower end which move in a substantially vertical plane during the
extension and retraction of said scissor arm unit,
said lower end at one extremity of said arm unit being pivotally
secured to said support frame at a point above water level and said
upper end at the corresponding extremity being slidably arranged
relative to said support frame above said lower end, and
said upper end at the other extremity of said arm unit being
pivotally secured to said boat support member at a point above
water level and said lower end at the corresponding extremity being
slidably arranged relative to said boat support member below said
upper end.
5. A boat hoist as defined in claim 4 including:
said means on said support frame to effect the extension and
retraction of said arm assembly comprising:
a shaft mounted on said support frame for rotation about its
longitudinal axis,
a source of power for rotating said shaft in two respective
opposite directions,
a first cable means wound in one direction on said shaft and
connected to said arm assembly adjacent said boat support member,
and
a second cable means wound in the opposite direction on said shaft
and operatively connected to said upper end of said arm assembly
adjacent said support frame whereby in one direction of rotation of
said shaft, said second cable pulls said upper end of said scissor
arm unit downwardly relative to said support frame to effect the
extension of said scissor arm during which time said first cable
means unwinds and in the reverse rotation of said shaft, said first
cable means winds up to effect the retraction of said scissor arm
unit with said second cable means unwinding to permit said upper
end to move upwardly relative to said support frame.
6. A boat hoist as defined in claim 4 including:
said means on said support frame to effect the extension and
retraction of said arm assembly comprising:
a block with a threaded bore having a vertical axis operatively
connected to said upper end of said scissor arm unit relative to
said support frame,
a vertically disposed shaft on said support frame mounted for
rotation about its longitudinal axis and threadably journalled in
said block, and
means on said support frame associated with said shaft to
selectively rotate the same in two respective opposite directions
whereby in one direction of rotation said upper end of said scissor
unit is moved downwardly to effect the extension of said arm
assembly and rotation of said shaft in the opposite direction moves
said upper end upwardly to effect the retraction of said arm
assembly.
7. A boat hoist as defined in claim 1 including:
a vertically disposed first trackway on said support frame,
the lower end of said trackway being fixed at a point above the
level of the water,
a second vertically disposed trackway carried by said boat support
member,
said arm assembly comprising:
a scissor arm unit including a pair of elongated rigid arms
pivotally connected at their longitudinal center and having at each
opposite extremity a pair of end members defining an upper end and
a lower end which move in a substantially vertical plane during the
extension and retraction of said scissor arm unit,
said lower end at one extremity of said scissor arm unit being
pivotally secured to the lower end of said first trackway and said
upper end at the corresponding extremity being slidably arranged
relative to said trackway,
said upper end at the other extremity of said scissor arm unit
being pivotally secured to the upper end of said second trackway
and said lower end at the corresponding extremity being slidably
arranged relative to said trackway,
the corresponding upper and lower ends of said scissor arm unit at
respective opposite extremities being at all times planar with each
other whereby with said arm assembly retracted, said upper end in
said first trackway is at the upper end thereof and said lower end
in said second trackway is at the lower end thereof and in the
extension of said arm assembly, said upper end in said first
trackway slides downwardly therein to effect a corresponding
lowering of said second trackway and boat support member at which
time said second trackway slidably moves downwardly relative to
said lower end of said scissor arm unit therein so that said boat
support member is progressively projected away from the shore line
and into the water.
8. A boat hoist as defined in claim 7 including:
means adjustably attaching said first trackway to said support
frame to permit of its vertical adjustment thereon relative to the
level of an adjacent body of water.
Description
BACKGROUND OF THE INVENTION
This invention relates to improvements in boat hoists of the type
commonly found along the banks of rivers and lakes to facilitate
the launching of boats and particularly to store them in a position
completely out of the water when not in use.
Boat hoists of the general type indicated above are found in many
varieties and are in common use particularly by those who have
temporary or permanent residences on a river or lake. For such
persons, their boat is usually kept at the water site for extended
periods and when the boat is not in use, it is highly desirable
that it can be docked in such a way that it will not be subject to
damage from wind or water as would be the case if it were tied to a
fixed dock. For this purpose many forms of hoists are available
which provide boat supporting platforms that can be lowered into
the water and elevated therefrom. So far as can be determined,
practically all such hoists have supporting structures that rest
upon the bottom of the river or lake at suitable points relative to
the bank and while such types of hoists will suitably support a
boat and permit its launching into and removal from the water at
times, it is necessary in areas where freezing temperatures occur
to completely remove such hoists from the water during such cold
season in order to prevent substantial damage thereto when the
water freezes and subsequently thaws. The destructive effect of
such freezing and thawing is well known and in climates where this
occurs, not only must all boat hoists be removed from the water but
likewise the annual removal and replacement of ordinary docks is a
regular practice.
The disadvantages of present type boat hoists as referred to above
and the expenses associated therewith have been completely
eliminated by the present invention in which the principal object
is to provide an improved boat hoist having its sole support on a
shore mounted base and which is operable to support a boat whereby
the boat can be extended into the water for launching and can be
withdrawn out of the water for storage in a position completely
free of any water contact.
A further object of the present invention is to provide a boat
hoist of the above class which can be maintained in its operable
position on a year round basis and is capable of supporting a boat
at all times completely free of the water so that neither the hoist
nor the boat if it is left thereon year round is subject to any
damage from the freezing and thawing of the water and the movement
of debris therein during such periods.
Still another object of the present invention is to provide a boat
hoist as characterized which is relatively simple in construction
and which may be suitably operated either manually or by power.
SUMMARY
The present invention utilizes a support base or structure suitably
mounted entirely upon the shore of a river or lake. Such structure
includes a pair of vertically disposed and horizontally spaced
tracks that may be anchored in concrete or in any other suitable
manner. A pair of extensible and retractable scissor arms are
disposed so that their respective end members move in a vertical
plane and are mounted at one end to the respective tracks in such a
manner that the lower ends of the scissor arms are pivotally
secured thereto and the upper ends of such arms carry rollers
disposed to move vertically therein. The other ends of the scissor
arms are in a reverse arrangement to that at the shore support
relative to a pair of spaced vertical tracks carrying a horizontal
boat support platform so that on the tracks associated with the
boat platform, the upper part of the scissor arms are pivotally
secured thereto and the lower ends carry rollers.
Means for extending and retracting the scissor arms are provided at
the shore support and this can be accomplished in a variety of ways
by either manual or mechanical devices. For illustration, I have
shown both cable and gear devices although it will be appreciated
that other forms may be used for the purposes involved.
The docking or out of the water position of the hoist normally
maintains the boat approximately two feet out of the water which is
satisfactory for general use during the boating season and likewise
the boat platform is submerged approximately 2 feet for launching.
Such dimensions, however, are not critical and can be varied as
desired by the size of the scissor arms and number of scissor
sections used. Preferably, the shore mounted support is vertically
adjustable so it can be elevated an additional foot or more
relative to the water level during a period of general non-use such
as winter time as an added precaution for complete safety from
shore line ice accumulations.
The objects of this invention together with details of the
operation outlined and the advantages of the same will be more
fully described and developed in relation to the more detailed
description of the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of this new boat hoist showing the
shore mounted base support and with the scissor arm assembly in
partially extended position,
FIG. 2 is a side elevational view showing the hoist in retracted or
elevated position with a boat on the boat supporting platform,
FIG. 3 is a side elevational view similar to FIG. 2 but showing the
hoist in extended and lowered position with the boat in the water
ready for launching,
FIG. 4 is a top plan view showing this hoist in extended
position,
FIG. 5 is a cross sectional view taken on the line 5--5 of FIG.
2,
FIG. 6 is a fragmentary perspective view of the upper portion of
the shore mounted support to illustrate a modified form for
extending and retracting the scissor arms in relation to the shore
mounted support,
FIG. 7 is a cross sectional view taken on the line 7--7 of FIG.
6,
FIG. 8 is a cross sectional view taken on the line 8--8 of FIG. 3
to show the movable attachment of the upper end of the scissor arms
to the shore mounted support,
FIG. 9 is a sectional view taken on the line 9--9 of FIG. 8 to show
the fixed pivotal connection of the lower scissor arm to the shore
mounted support,
FIG. 10 is a front elevational view of the shore based track
assembly to better illustrate its vertical adjustment relative to
the shore oriented support base, and
FIG. 11 is a side view of the assembly in FIG. 10 showing the
normal position in solid lines relative to water level and a
selective elevated position in broken lines.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, this new boat hoist is designated
generally by the numeral 10 as best seen in FIG. 1 where it is
shown in partially extended position and includes generally a shore
mounted base or support 12, a boat supporting platform 14, an
extensible and retractable scissor type arm apparatus 16 connecting
the platform 14 to the base 12, and an operating mechanism 18
carried by the base 12 for effecting the extension and retraction
of the boat platform 14 by means of the scissor apparatus 16. Such
structure as briefly described and as will be referred to in detail
as this description proceeds, is illustrated in its retracted
position in FIG. 2 showing a boat 20 supported on platform 14
completely out of and above the surface of a body of water 22 and
in FIG. 3, this hoist 10 is illustrated in its extended position
where platform 14 is submerged in the water 22 so that the boat 20
may be easily floated or launched.
The base or supporting structure 12 includes the vertically
disposed and horizontally spaced channel members 24 and 25 having
the respective longitudinal slots 26 and 27 intermediate their
ends. Such channel members are disposed so that the channel areas
28 and 30 as best seen in FIG. 6 are oppositely disposed to each
other and define respective tracks or trackways as will later
appear. The upper ends of channels 24 and 25 are connected by a
beam 32. Support 12 as thus described is designed to be mounted
securely by any suitable means upon the shore so that when it is so
mounted, no part of the support will be in the water or resting on
the lake or river bottom. It will be appreciated and understood
that base 12 can be suitably and securely mounted at a shore
location in a variety of ways and for purposes of the present
disclosure, I have shown it mounted relative to a concrete seawall
34 although the use of a seawall is not a requirement for the
present invention.
As best seen FIGS. 2 and 3, the seawall 34 presents a vertical face
36 at the shore line and, accordingly, I have anchored the channel
members 24 and 25 to surface 36 of the seawall 34 by suitable
anchor bolts 38 through slots 26 and 27. In addition I have
provided diagonal braces 40 and 41 as best seen in FIG. 1 which are
secured respectively at one end to the channels 24 and 25 through
slots 26 and 27 by bolts 42 and are anchored at the other end into
the seawall 34 as shown in FIG. 3. It will be noted that the lower
end of channels 24 and 25 are spaced above the normal level of
water 22 and when mounted as described, base 12 is securely
anchored on a shore oriented support and, as indicated above, any
other suitable means for anchoring base 12 in a similar location
may be appropriately employed. In the normal use of this hoist 10,
the platform 14 will be approximately two feet out of the water
when retracted as seen in FIG. 2 and this has been found to be
generally adequate during the general boating season. However,
during the off-season when the boat is preferably in winter storage
and shore line ice accumulations are possible, support 12 as best
seen in FIGS. 10 and 11 can be elevated an additional 18 to 24
inches by loosening the bolts 38 and 42 and using any suitable jack
device for which an auto bumper jack is adequate and generally
readily available. By tightening the volts with support 12 elevated
it will be safe from damage over the winter and no dismantling or
removal of the support relative to its shore mounting is
required.
The boat platform 14 for purposes of reference includes an inner
end 44 and an outer end 46. Platform 14 is substantially an
elongated rectangular rigid frame structure including spaced
parallel side pieces 48 and 50 connected at the inner end 44 by the
cross member 52 and at the outer end 46 by the cross member 54 as
best seen in FIG. 1. An intermediate cross member or support 56
connects rails 48 and 50 intermediate cross member 52 and
approximately the longitudinal center of side pieces 48 and 50.
Thus, cross pieces 54 and 56 serve to support the boat 20 as will
be obvious.
Secured to cross piece 52 in spaced relationship are the vertical
channel members 58 and 60 which are connected at their upper ends
by a cross member 62 corresponding in length and being parallel to
member 52. Thus arranged, members 52 and 62 each project outwardly
from the respective vertical planes of channels 58 and 60. The
channel portions on members 58 and 60 are oppositely disposed to
each other so as to provide the respective tracks or trackways 64
and 66 (FIG. 4) whereby the general construction and relationship
of channels 58, 60 and member 62 provide a track containing frame
assembly similar to that previously described for channels 24 and
25 having the trackways 28 and 30.
As seen in FIG. 1, platform 14 includes the additional rails 68 and
70 which are secured respectively at one end to the respective end
portions or rail 62 so as to extend on an incline toward the outer
end 46 of platform 14 where they are secured in any suitable manner
near the outer ends of rails 48 and 50. Intermediate their length,
rails 68 and 70 are supported by appropriate braces 72 as shown.
Thus arranged, rails 68 and 70 provide adequate support for end 54
of platform 14 and also serve as lateral guides for the boat 20 and
as seen in FIGS. 2 and 3 where the bow section of the boat will be
protected from lateral movement relative to the supporting members
of platform 14.
The scissor arm assembly 16 which, as indicated previously,
connects the boat platform 14 to the base support 12, comprises a
pair of parallel and connected scissor arms 74 and 76 as best seen
in FIG. 4 which are of like construction so that only a description
of arm 76 as seen in FIG 3 will be made and like parts on arm 74
will be given like numerals. The number of scissor type units in
arm 76 is a matter of choice depending upon the distance of
extension desired for platform 14 and the depth into the water in
which it will move and for purposes of this application, as seen in
FIG. 3, I have illustrated arm 76 by having three scissor sections,
each of which includes an inner elongated rigid link 78 and an
outer elongated rigid link 80 of like lengths which are pivotally
connected at their center by pin 81. Each pair of links 78 and 80
constitute what I have referred to as a scissor unit and are
disposed so that in the opening and closing of the scissor arms,
the respective ends of such arms will move in a vertical plane.
Thus at one extremity of arm 76 relative to the shore support 12
there is the respective upper end 82 and lower end 84 and at the
opposite extremity, the corresponding ends are identified by the
numerals 82' and 84'. The number of scissor units, as indicated
above, will be a matter of choice and intermediate the end members
82 and 84 and 82' and 84', the respective ends of such intermediate
scissor units on arms 74 and 76 are connected for pivotal movement
in any suitable manner such as by the tubular members 86. In this
regard and with reference to FIG. 5, the inner scissor arms 78 are
secured to the outer surface of tube 86 and made rigid by means of
a gusset 88. The outer arms 80 are secured to respective sleeves 90
which are rotatably journalled on the respective ends of tube 86.
This has proved to be a satisfactory arrangement for the scissor
arm action but it will be understood that any other suitable means
for producing the scissor arm effect may be used.
The lower ends 84 of scissor arms 74 and 76 are connected by a
tubular member 92 as best seen in FIG. 9 and such ends 84 are
pivotally attached by any suitable bearing means such as 94 to the
lower portions of the shore mounted channel members 24 and 25 so
that while such ends 84 will pivot relative to such channels, they
will not move vertically relative thereto. The upper ends 82 of
scissor arms 74 and 76 are also connected by a tubular member 96 as
best seen in FIG. 8 and the extremities of such tube are provided
with appropriate roller members 98 which are vertically movably
disposed within the trackways 28 and 30 in the respective channels
24 and 25. At the opposite ends of scissor arms 74 and 76, the
reverse arrangement to that described is provided whereby the upper
ends 82' are connected by the tube 100 as best seen in FIG. 1 and
are pivotally arranged relative to the upper portion of rails 58
but not vertically movable relative thereto in the same
relationship as for ends 84 on channels 24 and 25. The lower ends
84' of scissor arms 74 and 76 are suitably connected by an
appropriate tube (not shown but similar to the tube 96 in FIG. 8)
on which there are provided the rollers 102 (FIG. 3) which are
rollably journalled in the tracks 64 and 66 of channels 58 and 60
in the same manner as the arrangement of end 82 in tracks 28 and
30.
Thus far described, it will be seen in FIG. 2 when the scissor arms
16 are retracted that the vertical movable arm ends 82 are at their
upper extremity of travel relative to the upper end of the shore
support 12 and that the pivotally attached but not vertically
movable arm ends 82' will be planar with ends 82. Also, in this
position the roller arm ends 84' are disposed at the lowermost
point of channels 64 and 66 at the inner end 44 of boat platform 14
and such arm ends 84' are planar with arm ends 84. As the scissor
arms 16 are permitted to extend by means as will later be
described, it will be seen in FIG. 3 that roller arm ends 82 move
downwardly relative to the shore support 12 so that as the platform
14 is projected outwardly frame assembly 58, 60 and 62 with arm
ends 82' attached thereto move downwardly correspondingly and with
ends 82' remaining planar with arm ends 82. As this occurs,
channels 64 and 66 ride downwardly over the roller ends 84' which
remain planar with ends 84. It will thus be seen that while the
scissor arm assembly remains on a horizontal plane during its
extension, the top plane of such assembly is progressively lowered
and by the reverse arrangement of roller ends 82 and 84', platform
14 is projected away from the shore line toward deeper water and
lowered below the water level. When the scissor arms are retracted
from the extended or launching position shown in FIG. 3 to that of
FIG. 2 the reverse movements from those described take place. It
will be appreciated that scissor arm ends 82 and 84' can be
pivotally secured the same as ends 84 and 82' and while this could
permit the extension and retraction of platform 14, hoist 10 would
of necessity have to be rather steeply tilted toward the relatively
shallow water near the shore and would not have the advantage of my
preferred embodiment described in projecting platform 14 during
launching into deeper water more distant from the shore line.
It will be appreciated that various means and devices can be
employed to effect the extension and retraction of this hoist
arrangement and for purposes of illustration, I have shown the use
of cable means together with an alternate gearing form illustrated
in FIG. 6.
While it may appear from the description thus far that because of
the normal weight of platform 14 and the scissor arm assemblies 16
and particularly if a boat 20 is on the platform, the arm
assemblies would normally project to their extended position,
experience has shown that with a sturdily constructed scissor arm
assembly, a suitable manual or power means should be employed to
facilitate the operation of such assembly. Accordingly, with
reference now more particularly to FIGS. 1, 4 and 10, I provide an
elongated shaft 104 disposed in parallel relationship above beam 32
and rotatably journalled in bearing members 106 and 108 so that
such shaft projects outwardly relative to each bearing member. At
one side of support 24, is secured a platform 110 to support a gear
box 112 through which one end of shaft 104 is operatively arranged.
Below shelf 110 is a second shelf 114 on which is mounted a
suitable electric motor 116 connected by a belt 118 to a large
pulley wheel 120 mounted on a shaft 122 connected to the gear box
112 in a well known manner. A switch means 124 is suitably located
and operatively connected to motor 116 in any well known manner.
Wound in the same direction each projecting end portion of shaft
104 are the respective cables 126 and 128 that connect with the
respective opposed end portions of the upper cross member 62 as
best seen in FIG. 4. For this purpose, I preferably secure the ends
of the respective cables 126 and 128 to the respective turnbuckles
130 and 132 which in turn are attached to the respective eyes 134
and 136 on rail 62. To keep such cables generally from lateral
deflection, I provide the small compression springs 138 and 140
which connect the respective cables at their point of attachment to
the turnbuckles to members 64 and 66. A third cable 142 is wound on
shaft 104 intermediate cables 126 and 128 and in a reverse
direction thereto and as best seen in FIG. 10 extends downwardly
where it is reeved around a pulley 144 secured to tube 92
connecting ends 84 of the scissor arm assembly 16 and then extends
upwardly where it is reeved around pulley 146 secured to tube 96
which connects ends 82 of assembly 16. From pulley 146, cable 142
extends downwardly where it is secured to an eye 148 on tube 92. By
the above arrangement, it will be appreciated that with hoist 10 in
retracted position as shown in FIG. 2, actuation of motor 116 to
permit the proper directional rotation of shaft 104 for the
unwinding of cables 126 and 128 and the winding of cable 142
results in tube 96 being pulled downwardly to correspondingly lower
scissor arm ends 82 and 82' and permit the launching of boat 20
from the position shown in FIG. 3 as previously described. In this
way, the extension of platform 14 and the retraction thereof is
done under a controlled power arrangement so that there will be no
damage to the boat. By reverse rotation of shaft 104, hoist 10 is
returned to the position in FIG. 2.
In FIGS. 6 and 7, I have illustrated a modified form for
controlling the extension and retraction of the scissor arm
assembly 16 and this includes pivotally attaching to the cross beam
96' at end 82 a suitably threaded block 150 to receive an acme
threaded shaft 152 operatively connected to a gear housing 154
mounted on cross beam 32. The gearing in housing 154 is shown
arranged for manual operation by means of a handle 156 although it
will be appreciated that this could be power operated, if desired.
With this arrangement, it will be understood that operation of
handle 156 will rotate shaft 152 and cause block 150 to move either
upwardly or downwardly depending upon the direction of rotation.
The effect of this will be the same as the operation of cables 126,
128 and 142. Accordingly, from all of the foregoing it is thought a
full and complete understanding of this invention will be had and
that the advantages of the same will be appreciated.
* * * * *