Abstract:
A boat seat is mounted on two sets of slidably engaged members for slidably adjusting the location of the boat seat front and back with a locking mechanism for holding the seat at its adjusted location comprising a locking pin for engaging detent holes controlled by a lever arm extending out the front of and below the boat seat.

Description:
FIELD OF THE INVENTION 
     This invention is to provide a slide adjustment and locking arrangement for a boat seat for slidably adjusting the seat fore and aft. It is primarily aimed for use with a low profile boat seat, i.e., where the boat seat rests virtually directly on the boat deck or on a raised portion of the boat deck but might find use with a pedestal mounted or raised boat seat. 
     DESCRIPTION OF THE PRIOR ART 
     The most pertinent prior art that applicant is presently aware of appears in U.S. Pat. No. 5,082,328 by Richard J. Garelick and U.S. Pat. No. 5,884,887 by Garelick and Pilosi and the references cited therein. 
     The &#39;328 patent utilizes a pair of slidably engaged plate members for fore and aft adjustment with the boat seat attached to an upper plate member and a lower plate member anchored in some fashion to the boat deck For locking, a handle at the end of a laterally or sidewise extending threaded rod, which is threadably engaged in the side of one of the plate members, is turned to thread the rod into the plate member to force the opposite edges of the engaged plate members into snug frictional engagement to hold the two plate members together to prevent them from sliding with respect to one another. While successful, this device was somewhat awkward to use and did not have a solid anti-slide locking arrangement. The &#39;328 patent also has a spring-biased lever arm for operating a locking pin for locking the seat against rotation or swiveling after it has been adjusted to the desired facing or direction. 
     The &#39;887 patent also has similar slidably engaged members for adjusting the seat fore and aft. An edge of one of the members has a series of recesses for receiving teeth on a rod mounted in a track of one of the slidably engaged members. A spring biases the rod rotatably so that the teeth engage the recesses to lock the members together. An arm or handle extending outward and below the slide assembly is pushed (or pulled) to move or rotate the rod against the spring bias to disengage the teeth from the recesses to unlock the slide so that the seat can be slidably adjusted fore and aft. The slide assembly in both the &#39;328 and the &#39;887 patents are made for a specific style and dimensioned boat seat (usually raised or pedestal mounted boat seats) and are not adaptable for use with boat seats of various sizes or dimensions, particularly boat seats of different widths which are usually deck-mounted seats on speed boats or bass fishing boats or the like. Also, similar to the &#39;328 patent, in the &#39;887 patent manipulating the handle for unlocking the sliding members is somewhat cumbersome and is not convenient to use with a low profile or deck mounted seat. 
     SUMMARY OF THE INVENTION 
     As the word “tandem” in the title implies, this lockable slide for boat seat has two separate sets of slidably engaged members which are spaced laterally from one another under the boat seat. The upper member of each set is attached to the underside of the boat seat and is slidingly engaged with the lower member which is attached to the underlying support, usually the boat deck. The lower member of each set has inwardly extending slots defining a horizontal track and the other member of each set has outwardly extending edges or lips for slidably engaging the tracks of the lower member to permit the boat seat to be slidably adjusted fore and aft as desired. In at least one of the sets the lower member has an upstanding side wall with detent holes and the other member has a pin or rod slidably engaged in openings in opposite side walls of the member for engaging the detent holes to lock the two members against further sliding adjustment. A resilient member urges the pin into engagement with the detent openings. A lever arm which is engaged with the locking pin has a handle extending out the front end of the upper member by which the lever arm is movable in opposition to the urging of the resilient member to slidably disengage the pin from the detent opening to permit the seat to be slidably adjusted fore and aft. 
     The members of each set are metal extrusions, preferably aluminum, which can be made of any length as desired to accommodate boat seats of different depth, i.e., front to back dimension. Also, the sets can be mounted at any spacing necessary to accommodate the width dimension of a boat seat. Further, if needed, the locking feature can be incorporated into both sets of slidable members and the handles of the lever arms can be attached together so that they will operate in unison. A feature of this design is that it only takes a relatively short throw or motion of the handle of the lever arm to disengage the locking mechanism to permit the seat to be slidably adjusted. Also, the lever arm handle in front is at a somewhat more convenient location than a handle or knob extending outward from a side of the seat. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an end view of an embodiment of the invention; 
     FIG. 2 is a vertical section of one set of slidably engaged lockable members; 
     FIG. 3 is a blown-apart perspective view; 
     FIG. 4 is a top view with its upper plate removed showing the interior of the lockable member; and 
     FIG. 5 is a top partial breakaway view illustration of an alternate embodiment. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A boat seat  10  shown in shadow or phantom line is mounted on a pair of laterally spaced left and right or port and starboard sets of slidably engaged members identified respectively by reference numerals  11  and  12  which are mounted to the boat deck or flooring  13  and the underside of boat seat  10 . Both sets  11  and  12  have a lower member  14  and a slidably engaged upper member  23 . Lower member  14  has an extending flange  15  for securing the member to the boat deck in some conventional fashion usually by suitable bolts in suitably located openings in flange  15 . Member  14  has a pair of upstanding laterally spaced side walls  16  and  17  and a beveled bottom wall  18  extending between the two side walls  16  and  17  and a pair of elongated inwardly opposite-facing elongated slots  19  forming tracks in side walls  16  and  17 . Extending upward from side wall  16  is a rigid strip or sidewall extension  21 . Strip  21  in set  12  has a series of longitudinally spaced detent holes  22  (see FIG.  3 ). 
     Both upper members  23  have an elongated chamber  30  formed by a bottom, a pair of side walls  25  and  26  and a top plate member  27 . Preferably members  23  have a beveled bottom wall between the bottom edges of side walls  25  and  26 . A flange  28  extends outward from top plate  27  and has a series of holes  31  for bolts to attach member  23  to the underside of boat seat  10 . Both members  23  and  14  are extrusions or are cast out of a rigid metal preferably aluminum to conserve weight. Extending outward from the lower part of side walls  25  and  26  are lips  29  forming rails which slidably engage the slots or tracks  19  of member  14 . The beveling of the bottom walls  24  and  18  allows a snug but slidable fit of the rails  29  in their respective slots or tracks  19  while minimizing the possibility of jamming or galling of the two slidably engaged members. 
     Heretofore the description of the embodiment illustrated in FIG. 1 was relative to the commonality between the two sets  11  and  12  of the slidably engaged upper and lower members  23  and  14 . However, with regard to set  12  (the right hand set as viewed in FIG.  1 )as mentioned earlier, the upper extending strip  21  of lower member  14  in set  12  has a series of longitudinally spaced detent holes or openings  22 . A locking pin  33  is slidably engaged in opposite facing holes in the side members  25  and  26  of upper member  23  in set  12 . Locking pin  33  has an undercut or annular outer groove  34  for engaging a slot  35  at one end of an elongated lever arm  36 . Lever arm  36  is pivotally attached to upper member  23  by a pivot pin  37  which somewhat loosely engages an opening  38  in lever arm  36 . Lever arm  36  is angled at  39  and extends out the front of chamber  30  to terminate in a handle end  40 . A spring  41  is coiled around locking pin  33  between lever arm  36  and side wall  25  and is in compression or biased to urge the end of lever arm  36  in a direction to move locking pin  33  to seek engagement with one of the detent holes  22  in the slidably engaged lower member  14 . The handle end  40  of lever arm  36  can be moved laterally to cause its distal end to move against the urging of spring  41  to draw the locking pin out of engagement with the detent hole  22  so that the boat seat can be slidably adjusted fore and aft. When the seat is in the desired location handle  40  can be released. The seat might have to be slid slightly forward or rearward until the locking pin  33  comes face-to-face with a detent hole  22  and then slides into the detent hole to lock the seat in the adjusted position. 
     Turning to the alternate embodiment illustrated in FIG. 5, the corresponding parts of the embodiment described heretofore are similarly marked with the same reference numeral in FIG.  5 . As can be readily observed, the only difference between the two described embodiments is that the FIG. 5 embodiment comprises two identical sets of slidably engaged upper and lower member  23  and  14  with both sets incorporating a lever arm  36  for controlling the operation of a locking pin  33  which is biased by spring  41  toward detent holes  22  into the locking position. Both lever arms have a frontward extending handle  40  and the two lever arms are joined together at the handle end by an extension identified by reference numeral  42  so that the control of the locking pin in each set is done in unison. This arrangement may be necessary for a fairly wide boat seat to ensure that it is positively locked at both sides to avoid or minimize any shakiness.