Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
106Z305
BUMPER TRAILER HITCH
This invention is a detachable vehicle front or rear
bumper trailer hitch which can be used for hauling trailers of
various types and for launching a boat mounted on a trailer into
a body of water by using the front end of the vehicle.
BACKGROUND OF THE INVENTION
There is a need for a lightweight readily detachable
trailer hitch that can be secured to the front or-rear bumper of
an automobile or light truck for hauling trailers of various types.
A particular problem relates to hauling pleasure boats
by trailer. Many people who own pleasure boats today haul the
pleasure boats to various attractive water sites by means of trailers
which are hitched to the rear of an automobile or a light truck.
When the driver reaches the body of water upon which he wishes to
launch his boat, he backs the trailer with the boat mounted thereon
into the water until the boat can be either floated or slid off
the trailer into the water.
There are a number of difficulties associated with launching
a pleasure boat into a body of water in this manner. First, parti-
Gularly in locations where the shore advances into the water at ashallow grade, the trailer must be backed into the water a con-
siderable distance, which oftens means that the rear drive wheels
of the automobile or light truck are also backed into the water. Many
times, when the driver wishes to move the automobile or light truck
forward, he finds that the rear wheels are mired in water logged sand,
or there is no traction because algae and other underwater organisms
have left a slippery film on the underwater areas of the shore line.
The driver then must go to considerable trouble to get his vehicle
free of the water. Sometimes, the driver has to go so far as to
call a tow truck to pull his vehicle free. This is a considerable
nuisance and frequenly very expensive, particularly in wilderness
recreational areas that are located a considerable distance from
service stations that operate tow trucks.
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Another difficulty associated with backing the trailer and
the boat into a body of water is that by having the trailer hitched
to the rear of the automobile or light truck, the driver must drive
the vehicle backwards, and in doing so, he must turn his head so that
he can look out the rear window of the vehicle. This is awkward.
Moreover, many drivers have trouble with backing a trailer attached to
the rear of the automobile or truck because in order to make the
trailer travel in the direction desired, the front steering wheels of
the vehicle must be moved in a direction reversed to the direction
normally used to back up the automobile. The driver also tends to
become dis-oriented when he twists around in order to look out the
rear window of the vehicle and this adds a complicating factor to the
tricky task of backing the trailer in the direction desired.
SUMMARY OF THE INVENTION
I have developed a simply easy to use trailer hitch which
can be detachably fastened to the front or rear bumper of an auto-
mobile or a light truck, and can be used to haul virtually any type
of trailer having a tongue weight of up to about 500 pounds.
My trailer hitch can also be used and is primarily intended
to enable a boat trailer to be pivotally hitched to the front bumper
of the automobile or light truck. This enables the driver to back the
trailer carrying the boat into an attractive body of water by looking
directly through the front windshield. This system has a number of
advantages. First, the driver does not have to twist around to look
through the rear windshield of the vehicle. This is much more con-
venient for the driver and also eliminates the tendancy of the driver
to become dis-oriented. Second, the driver can see the direction
that is being travelled by the trailer at the same time that he can
see the steering wheel. In this way, the driver quickly learns to
move the steering wheel in the direction nece~sary in order to make the
boat trailer travel in the direction he wishes. Third, by using the
front end of the automobile, or light truck, for backing the trailer in
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the water, the chances are very good that the rear drive wheels
of the vehicle will remain on dry land. Then, when the driver
wishes to pull the trailer and the boat out of the water, the
rear drive wheels have considerably more traction.
The detachable trailer hitch I have invented is simple
and ruggedly constructed and can be quickly and easily fastened
to the front bumper of a standard automobile or light truck.
The hitch (which can be called a "spotting" hitch) is readily
detachable because most automobile drivers do not want to have
a trailer hitch permanently attached to the front of their
automobile.
Normally, a driver pulling his boat by trailer will
have a p~nent or semi-permanent trailer hitch attached to the
rear of the automobile or light truck. The boat trailer is then
secured to the rear trailer hitch and pulled to the destination
while riding at the rear of the vehicle. Once the destination
is reached, however, the driver attaches my detachable front
bumper hitch to the front bumper of the vehicle. The boat
trailer is then disconnected from the rear hitch and dropped
temporarily to the ground, or propped up by means of a log or
some other handy article. The driver then reverses the direction
of the vehicle so that the trailer can be attached to the
detachable hitch mounted on the front bumper. The driver then
proceeds to manoeuvre the boat trailer with the boat mounted
thereon towards the water and backs the trailer and boat into
the water.
My "spotting" hitch is not heavy and cumbersome like
many known hitches available on the market and is ideally suited
for attaching to the light, relatively weak bumpers that are
used on today's automobiles and light trucks~ My "spotting"
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hitch is constructed so that it does not place undue stress
on the bumper at any single location, which could result in
damage to the bumper. My hitch is also designed so that most
of the load is exerted at the top of the bumper, which tends
to distribute the load through the bumper supports without
bending the bumper downwardly. Finally, my hitch can be
located at any point on the bumper close to one of the rein-
forcing supports, thereby virtually eliminating any possibility
of damage being done to the bumper.
My front trailer hitch can be quickly secured to the
front bumper of the automobile simply by moving a lever which
tightly secures the hitch to the front bumper of the automobile.
My trailer hitch comprises:
(1) a main hitch member carrying a hitch ball and having
a bumper catch thereon, capable of attaching to and gripping
the upper edge of the bumper of the vehicle,
(2) a pivot member pivotally connected to the main
hitch member,
(3) a second bumper catching means connected to the
pivot member, and being capable of attaching to and gripping
the lower edge of the bumper of the vehicle,
(4) means connected to the main hitch member for
supporting the hitch on the bumper, and
(5) means connected to the main hitch member and the
pivot member for tensioning the second bumper catching means
against the lower edge of the bumper while the bumper catch of
the main hitch member is secured to the upper edge of the
bumper of the vehicle and the means connected to the main hitch
member support the hitch on the bumper.
The means connected to the main hitch member for
supporting the hitch on the bumper can be two adjustable bumper
legs fitted into two leg nuts on the main hitch member. The
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---two bumper legs can have feet mounted on the ends thereof con-
structed of a resilient material Moreover, the two bumper legs
can be threaded into the leg nuts
The second bumper catching means can be a bumper clip
adjustably attached by a flexible strap to the pivot member.
The strap can be connected to the pivot member by means of a
strap catch which permits the leng_h of the strap to be adjuste~
The means for drawing the second bumper catching means
against the edge of the bumper can be constructed of a hana lever,
and a fork hinge, which together co-operate with the pivot mem~er
an~ the main hitch member to move the second bumper catching
means toward or away from the edge of the automobile bumper as
required. When the second bumper catching means is drawn away
from the edge of the bumper to firmly secure the hitch ~to the
bumper, the length of the strap is adjusted so that the hand
lever can move to a position which provide~ a locking action to
the hand lever, fork hinge and pivot member combination. --
My invention is also directed to a method of launching
a boat mounted on a trailer into a body of water comprising:
(1) attaching a trailer hitch to the front
bumper of a vehicle,
~2) securing the hitch of a boat trailer to
the hitch attached to the front bumper of
the vehicle,
(3) backing the boat trailer with a boat mountea
thereon into the body of water while t~e
trailer is secured to the hitch attachea to
the front bumper of the vehicle, and
~4) launching the boat from the trailer while the
trailer is in the water.
DRAWINGS
In the drawings: -
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Figure 1 represents a side view of the front
detachable bumper hitch attached to the front bumper of an
automobile or light truck;
Figure 2 represents an exploded perspective view of
the various components making up the detachable front bumper
hitch; and
Figure 3 represents a partial section side view of the
front detachable bumper hitch.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figure 1, my detachable front bumper
trailer hitch consists of a three sided main hitch member 1
having a top side and two downwardly extending side wings 2 (see
Figure 2 for better view of two side wings 2). Mounted at the
bottom of each of the two downwardly extending side wings 2 are
two threaded leg nuts 4 having their bolt holes extending in a
horizontal direction parallel to the two respective side wings 2.
At the rear of the main hitch member 1 is a bumper catch 5, which
is shaped to curl around and firmly grip the upper edge of the
front bumper of most automobiles or light trucks available on
20 the market today. ~
As seen in Figure 2, on the top side of the main ~ -
hitch member 1 in the region of the hitch opposite the bumper
catch 5 is located a ball hole 3. A trailer hitch ball 26 fits
in ball hole 3, and is secured by a lock washer 27 and ball -
nut 28.
At the front of the main hitch member 1 opposite the
bumper catch 5 are located hinge pivot holes 6. Hinge pivot holes
6 are two laterally extending holes which receive hinge pivot .
pin 7.
Positioned within the two downwardly extending side ~ `
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wings 2 is a three sided internal pivot member 8 which has a
forward side and two rearwardly extending side pieces. Internal
pivot member 8 is sized so that in outer dimension it is slightly
less in width than the interior width between the two side wings
2, and thereby can move easily backward and forward within the
two side wings 2. Internal pivot member 8 has extending from
; the forward side thereof (the right side as seen in Figures 1
and 2) two hinge lever pivot arms 9. Two pivot holes 10 are
drilled in a lateral direction in the end areas of the two hinge
lever pivot arms 9.
Three pairs of holes, namely, two strap catch pivot
holes 12, two strap pin holes 14, and two internal pivot member
pin holes 15a are drilled in a lateral direction and opposite
one another in the two parallel sides of the internal pivot
member 8.
As seen in Figure 1, internal pivot member 8 is
~ pivotally supported inside the two side wings 2 by means of
;~ internal pivot member pin 15 which extends between the two pin
~, holes 15a. The two hinge lever pivot arms 9 extend in a forward
direction (to the right as seen in Figure 1).
As seen in Figure 1, the hinge pivot pin 7 pivotally
secures one end of a fork hinge 16 between hinge pivot holes 6.
The pronged end of the fork hinge 16 connects to a hand lever
18 by means of two fork hinge washers 17, and a hinge lever
pivot pin 20, which penetrates through two laterally extending
holes in the two prongs of the fork hinge 16 and a corresponding
hole in the hand lever 18, which is positioned between the two
prongs. The two washers 17 are positioned on each side of the
lever 18 between the two prongs of hinge 16.
One end of the hand lever 18 is positioned between the
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two hinge lever pivot arms 9 extending forwardly from the pivot
member 8 by means of a lever pin 19 which extends laterally
between the two opposite pivot holes 10 located in the ends of
the two hinge lever pivot arms 9, and a corresponding hole
drilled in the end of hand lever 18.
A bumper clip 21 by means of strap catch 23 is securely
connected to a flexible strap 22. The strap 22 can be constructed
of woven nylon or steel belting which provides a very strong
flexible securing means link between the bottom side of pivot -
member 8 and the bumper of a vehicle. As seen in Figure 1, the
- end of the bumper clip 21, opposite the end of the bumper clip
that contains the strap catch 23, is curved in order to fit
'~ around and firmly grip the bottom edge of the front bumper 29
of a normal automobile or ~ight truck.
, As is best seen in Figure 3, the end of strap 22 that
,~, is not connected to the bumper clip 21 at catch 23 is adjustably :~
,. and removably connected to the bottom side of internal pivot ;~
~A, member 8 by means of a pivotal strap catch 11. Strap catch 11,
which has a series of teeth on one side thereof, in order to
~, 20 securely grip the strap 22 (see Figure 2), pivotally fits within
~ the two laterally extending strap catch pivot holes 12 which
-~ are drilled in the two side pieces of the internal pivot member 8.
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The toothed strap catch 11, because it is pivotally
mounted, can pinch strap 22 between its teeth and the front
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~: inside wall of internal pivot member 8. By positioning the strap
catch 11 so that its teeth point in the direction of resisting
movement of the strap 22, a strong secure grip can be maintained
. on the strap 22.
. ~ To enhance the gripability of strap catch 11 against
strap 22, a second strap pin 13 is located between the two
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laterally extending strap pin holes 14 located in each of the
two sides of internal pivot member 8. As can be seen in Figure
3, strap 22 is fitted between strap catch 11 and the front
interior wall of internal pivot member 8, is then bent around
the teeth of strap catch 11, and is then threaded between the
space that exists between strap catch 11 and strap pin 13.
Having strap 22 bend through approximately 180 around the teeth
of strap catch 11 ensures that the strap catch has a good firm
grip on strap 22. However, since strap catch 11 can be pivoted
away from the interior front wall of internal pivot member 8, the
position of the strap 22 can be adjusted to give varying lengths
of strap 22 between bumper clip 21 and strap catch 11.
As seen in Figures 1 and 2, two bumper legs 24 extend
respectively through the two leg nuts 4 positioned on each of
i~ the two side wings 2. These two bumper legs 24 are threaded so
. that their position within the two leg nuts 4 can be adjusted
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throughout the entire length of the two bumper legs 24. Two
bumper leg feet 25, constructed of a resilient material such as
.~j
~ rubber, fit over the free ends of the two bumper legs 24. As
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seen in Figure 1, these two resilient bumper leg feet 25, which
. bear against the front edge of the front bumper 29, ensure that
, the chrome finish on the bumper 29 is not scratched or marked
in any way.
~ When a vehicle driver wishes to secure the detachable
.~ trailer hitch to the front bumper of an automobile or a light
truck, he simply places bumper catch 5 around the top edge of
~.~ the front bumper 29 (see Figure 1) secures bumper clip 21 to the
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bottom edge of the front bumper 29, adjusts the two bumper legs
24 against the front side of the bumper 29 so that the two bumper
. 30 leg feet 25 are snugly positioned against the front edge of the
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bumper 29, and then tightens the pull of bumper clip 21 by
pressing down on hand lever 8 until it reaches its most downwardly
position of travel. Hand lever 18 provides a mechanical
advantage which enables the driver of the automobile to securely
tighten strap 22, thereby ensuring that the trailer hitch 1 is
firmly attached to the front bumper 29.
It is well known that the design of automobile and
truck bumpers change with time, either due to fashion or changing
- safety factor requirements. Thus, the relative lengths and
widths of the various components of the trailer hitch should
be changed to accommodate the bumper design changes as required.
For instance, if the upper edge of the bumper extends inwardly
a substantial distance, then the length of catch 5 should be
s increased a greater distance than is shown in Figures 1, 2 and
3 so that it can grip the upper edge of the bumper. Similarly,
it might be found that in some bumper designs, the length of
;I the two bumper legs 24 should be increased so that the hitch
can be drawn tightly and firmly against the bumper. These
accommodating changes in the design of my trailer hitch can be
made without requiring invention.
~` As seen in Figure 1, the collar of the trialer
carrying the boat fits over the hitch ball 26 in a manner well
known in the trailer hitching art.
Most of the components of my front bumper trailer
hitch are constructed of steel, or similarly strong materials,
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3 so as to provide sufficient strength to assume the load stresses
that exist between a trailer hitch collar the hitch attached to
the front bumper of an automobile or light truck. To minimize
~' corrosion, all rigid metal parts of my trailer hitch should be
'~i 30 painted, except for the threads of the two bumper legs 24.
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While the foregoing provides a detailed description
of an embodiment of my trailer hitch that I have developed in
order to provide a simple, rugged and easily usable front
bumper hitch, it will be recognised that alternative constructions
can be designed without exercising inventive ingenuity. It is to
be understood that such modifications represent part of my
invention and fall within the scope of the claims to my
invention which follow this detailed description.
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