A transducer mounter comprises a portable housing adapted to have a wide variety of transducers fastened thereto. The housing is adjustable and releasably mounted to a boat transom by a suction cup and by an adapter that extends through the boat drain hole. The adapter and suction cup include resepective nuts that releasably hold the housing against the boat transom. Removing the nuts renders the housing and transducer portable as a unit. The present further includes a modified embodiment in which the housing is permanently mounted to the boat, but which, because of the housing design, permits adjustment of the transducer on the housing.

BACKGROUND OF THE INVENTION 
1. Field of the Invention. 
This invention pertains to marine equipment, and more particularly to 
apparatus for mounting sonar transducers on a boat. 
2. Description of the Prior Art. 
Many sportsmen use sonar transducers to determine likely spots for 
successful fishing. The sonar equipment locates elusive fish and therefore 
increases the likelihood of catching them. 
A recurring problem when using sonar equipment is the placement and 
retention of the transducer within the boat. In some applications, the 
transducer is temporarily mounted to a gunwale. That location is 
undesirable, because the exposed transducer is subject to accidental 
bumping and damage. It is known to attach transducers directly to the boat 
transom by means of screws turned into the hull. Such mounting is 
unacceptable to many boat owners, because the transducer location cannot 
be adjusted without drilling additional holes into their boats. Moreover, 
fishermen who rent boats are handicapped by the lack of suitable devices 
for temporarily mounting their personal transducers to the rental boats. 
Thus, a need exists for means to adjustably and temporarily mount sonar 
transducers to fishing boats. 
SUMMARY OF THE INVENTION 
In accordance with the present invention, a transducer mounter is provided 
that permits quick and easy attachment and removal of sonar equipment on a 
boat without altering the hull. This is accomplished by apparatus that 
includes a portable housing that is temporarily but securely mounted to 
the boat transom by using pre-existing boat structural features. In the 
preferred embodiment, the transducer mounter comprises an elongated 
5-sided housing having side walls and a front wall that form a generally 
U-shaped cross section. One end of the housing front wall defines a 
relatively large obround hole having the major dimension perpendicular to 
the longitudinal axis of the housing. The transducer mounter further 
includes a drain plug adapter in the form a hollow bolt. The drain plug 
adapter is designed to extend through the boat drain hole, with the boat 
held bearing against the inside of the boat transom and the threaded shank 
protruding through the drain hole. The adapter is held in place in the 
drain hole by a jam nut turned onto the adapter threads and bearing 
against the outside of the boat. To prevent leakage through the drain hole 
past the adapter, a seal, such as an O-ring, is interposed between the 
adapter head and the inside transom surface. The boat drain plug is 
inserted in the adapter passage, where the plug functions in the normal 
fashion. 
The obround hole of the housing first longitudinal end is passed over the 
protruding adapter threaded shank. A knob threaded onto the adapter 
threads secures the housing first end tightly but temporarily against the 
transom. To protect the boat surface, the housing first end includes a 
soft bumper that bears against the transom. 
The second end of the housing is secured to the boat by means of a suction 
cup that has a threaded stem. The cup is pressed against the transom such 
that the stem extends through one of several longitudinal slots formed in 
the housing front wall. A nut turned onto the stem and bearing against the 
housing front wall completes the mounting of the transducer mounter to the 
boat without damage or modification thereto. 
The transducer is adjustably fastened to the housing by means of screws 
passing through the housing slots and secured by nuts. The arrangement of 
the housing slots permits fastening a wide variety of transducer models 
and mounting brackets to the transducer mounter of the present invention. 
The housing slots permit convenient adjustment of the transducer 
longitudinally along the housing without moving the housing on the boat. 
At the same time, the housing can be adjusted angularly on the transom by 
means of the knob and housing obround mounting hole. The attachment of the 
housing to the boat by means of the drain hole adapter and the suction cup 
render the housing and transducer readily portable as a unit, thereby 
permitting easy removal from the boat for safekeeping at the end of the 
day's fishing. 
In some situations, a fisherman may want to permanently mount the 
transducer mounter to his boat. For that purpose, the housing contains 
holes for receiving screws that are threaded directly into the boat 
transom. In that case, the suction cup and drain hole adapter are not 
used. Adjustment of the transducer on the housing remains possible because 
of the longitudinal slots. 
Other objects and advantages of the invention will become apparent to those 
skilled in the art upon reading the disclosure.

DETAILED DESCRIPTION OF THE INVENTION 
Although the disclosure thereof is detailed and exact to enable those 
skilled in the art to practice the invention, the physical embodiments 
herein disclosed merely exemplify the invention which may be embodied in 
other specific structure. The scope of the invention is defined in the 
claims appended hereto. 
Referring to FIGS. 1-3, a transducer mounter 1 is illustrated that includes 
the present invention. The transducer mounter is particularly useful for 
fastening sonar equipment to a fishing boat 3, but it will be understood 
that the invention is not limited to fishing applications. 
The transducer mounter 1 comprises a portable housing 5 that has opposed 
side walls 7 connected by semi-circular end walls 8 and a front wall 9. 
Near the housing first end 10, the front wall 9 defines a large obround 
hole 11 having a major axis that is transverse to the housing longitudinal 
axis. The front wall further defines a series of longitudinally extending 
slots 13 having outer ends that terminate in enlarged holes 15 near the 
housing second end 40. Similar slots 14 have outer ends that terminate in 
enlarged holes 16 near the hole 11. A transverse leg 18 (best shown in 
FIG. 3) connects the side walls 7 and stiffens the front wall between the 
inner ends of the slots 13 and 14. 
The first end 10 of the housing 5 is mounted to the transom 17 of the boat 
3 by means of a drain plug adapter 19. As best shown in FIGS. 2 and 3, the 
drain plug adapter 19 is preferably formed as a hollow bolt having a 
treaded shank 21, an enlarged head 23, and a passage 25 extending through 
the shank and head. 
Reference numeral 27 indicates a suction cup having an elongated threaded 
stem 29. The transducer mounter 1 of the present invention further 
comprises an O-ring 31, jam nut 33, threaded knob 35, and brass nut 37. 
Referring especially to FIG. 3, the transducer mounter 1 is securely but 
temporarily mounted to the boat transom 17 without altering or damaging 
the boat by making use of the boat drain hole 39. The adapter shank 21 
extends through the drain hole 39 with the head 23 on the inside of the 
boat 3. The jam nut 33 is threaded onto the exposed shank from the outside 
of the transom. To prevent water from leaking into the boat through the 
drain hole around the shank, the O-ring 31 is installed on the shank 
against the head shoulder. To seal the passage 25, the conventional boat 
drain plug 41 is assembled to the adapter hollow head. 
The hole 11 of the transducer mounter housing 5 is positioned on the 
exposed shank 21 of the adapter 19. The knob 35 is turned onto the shank 
to thereby secure the housing first end 10 to the boat 3. Preferably one 
of the housing side walls 7 is flush with the bottom corner 63 of the boat 
when the knob is tightened. 
The second end 40 of the housing 5 is mounted to the boat by means of the 
suction cup 27 pressed onto the transom 17. The suction cup stem 29 passes 
through one of the slots 13. The brass nut 37 is turned onto the stem to 
seat against the housing front wall 9 and hold the housing second end to 
the boat. Shoulder 43 of the suction cup rests against and straddles a 
pair of longitudinally extending ribs 45 that lie alongside slots 13 and 
14. 
To reduce transmission of boat vibrations, especially in aluminum boats, 
and to protect the boat's surface, the housing 5 does not directly contact 
the transom 17. Rather, as best shown in FIG. 3, a bumper 47 of rubber or 
similar soft material is inserted into a hole 48 in the housing first end 
10. The bumper 47 therefore acts both as a vibration mount and as a 
protective pad. Similarly, the suction cup 27 serves the secondary purpose 
of isolating the housing end 40 from the transom. 
To fasten a sonar transducer 49 to the transducer mounter 1 of the present 
invention, a suitable mounting bracket 50 and conventional screws 51 and 
nuts 53 are employed, together with lock washers, not shown. The number 
and location of the slots 13 and 14 enable the housing 5 to accommodate a 
wide variety of transducers 49 and mounting brackets 50. The nuts 53 
straddle the housing ribs 45 alongside the slots. The transducer and 
mounting bracket may be fastened at any desired location along the slots. 
The obround hole 11 permits easy angular adjustment of the housing on the 
boat without having to move the transducer on the housing. 
With the drain hole adapter 19 and suction cup 27 installed, the housing 5 
and transducer 49 remain readily portable. The housing is easily removed 
from the boat 3 when desired by unscrewing knob 35 and nut 37 while 
leaving the adapter and suction cup secured to the boat. 
Further in accordance with the present invention, a slightly modified 
transducer mounter is provided that may be permanently mounted to a boat. 
Turning to FIGS. 4-6, the transducer mounter 55 comprises a housing 5' 
that is substantially identical to the housing 5 described in conjunction 
with FIGURES 1-3. To permanently mount the housing 5' to the boat transom 
17, lag screws 57 are employed that pass through clearance holes 48' in 
the housing. Metal washers 59 are placed under the heads of the screws 57, 
and additional washers 61 are interposed between the housing and the 
transom. When mounting the transducer mounter 55 to the boat, it is 
preferred that a housing side wall 7' be placed flush against the bottom 
corner 63 of the boat. 
After the transducer mounter 55 has been installed, the transducer 49 and 
the mounting bracket 50 are fastened to the housing 5'. The nuts 53 are 
loosely started on the screws 51. The nuts are then pushed through the 
slot end holes 15' and 16' that best suit the desired final location of 
the transducer. The transducer is slid along the slots 13' and 14' to the 
desired location on the housing. By pulling the transducer away from the 
housing, friction between the nuts and the housing ribs 45' hold the nuts 
in place while the screws are tightened. Realignment of the transducer is 
easily accomplished by loosening the screws 51 slightly, adjusting the 
transducer on the housing to the desired location, and retightening the 
screws. 
Thus, it is apparent that there has been provided, in accordance with the 
invention, a transducer mounter that fully satisfies the objects, aims, 
and advantages set forth above. While the invention has been described in 
conjunction with specific embodiments thereof, it is evident that many 
alternatives, modifications, and variations will be apparent to those 
skilled in the art in light of the foregoing dsecription. Accordingly, it 
is intended to embrace all such alternatives, modifications, and 
variations as fall within the spirit and broad scope of the appended 
claims.