in terms of greater detail , the portable rubbing pedestal and perch for cats that forms the subject matter of this invention comprises an improvement of the pedestal for cats disclosed and claimed in my copending application ser . no . 07 / 350 , 294 , filed may 9 , 1989 now u . s . pat . no . 4 , 996 , 946 . referring to fig1 herein it will be seen that this improved cat pedestal is more simple in its construction , easier to assemble and disassemble by virtue of a novel clamping assembly to be described hereinafter and , as seen in fig9 provides a perch for the cat that is not included in my copending application ser . no . 07 / 350 , 294 now u . s . pat . no . 4 , 996 , 946 . the portable rubbing pedestal for cats of this invention includes a base designated generally by the numeral 3 and comprising a generally rectangular member which may be fabricated from any desirable material , but is preferably fabricated from wood . mounted on the top surface 4 of the base 3 adjacent one end of the base are a pair of laterally spaced clamping means designated generally by the numeral 6 in the form of channeled or grooved blocks , preferably fabricated from wood , but obviously capable of being fabricated from any suitable material , such as plastic or metal . each of the blocks is provided with a base surface 7 that is securely attached to the top surface 4 of the base by appropriate attachment means , such as screws or bolts ( not shown ) which pass through the base 4 from the bottom surface thereof and engage the clamp blocks 6 through the base surfaces 7 thereof . each of the blocks 6 is provided with an outer face 8 and an inner face 9 , the inner faces 9 face each other and are mirror images of each other . in the embodiment of the invention illustrated in fig1 through 10 , the clamp blocks 6 are illustrated as having edge surfaces 12 and 13 that converge toward each other from the base 7 to be intercepted by a top surface 14 . it should be understood that while this embodiment illustrates the edge surfaces 12 and 13 as being tapered upwardly , this is not essential and these surfaces could just as well be perpendicular to the base member so that the clamp blocks 6 projected a generally rectangular configuration . however , for esthetic reasons , it is preferred that the clamp blocks 6 be formed in the configuration illustrated . formed in the inner surface 9 of each of the blocks is an elongated channel or groove designated generally by the numeral 16 , the groove 16 being formed by a bottom wall section 17 intercepted on one side by a wall section 18 that is perpendicular to the bottom wall section 17 and the outer and inner faces 8 and 9 , and intercepted on its other side by a wall section 19 that is inclined or which diverges away from the bottom wall section 17 as shown . as illustrated , the groove 16 slants upwardly away from the associated end of the base member 3 , the groove 16 extending the full height of the clamp block 6 , being intercepted at the bottom end by the base 3 and passing through the top surface 14 of the block as shown . bored through the bottom section 17 of the groove 16 is an aperture 21 through which a screw or bolt may extend for purposes which will hereinafter be explained . mounted in the groove 16 as illustrated in fig1 and 10 , is a keeper block designated generally by the numeral 22 and illustrated apart from any other structure in fig6 and 8 . the keeper block is elongated as illustrated in fig6 and 7 , and is provided intermediate its ends with a recessed grommet 23 having a central bore 24 appropriately threaded to receive the complementary threads of a machine screw 26 . each of the keeper blocks 22 is also provided with an end surface 27 which is adapted to lie flush on the top surface 4 of the base when the keeper block is inserted into the groove 16 so that the bore 24 of the grommet is in alignment with the bore 21 formed in the wall section 17 of the groove . in this relationship of the clamp block 6 and the keeper block 22 , the inclined or divergent wall 19 of the groove 16 coincides contiguously with a complementary inclined edge surface 28 formed on one long edge of the keeper block 22 . relative movement of the contiguous wedgingly engaged inclined surfaces 19 and 28 causes camming of the keeper block toward or away from the opposite wall 18 of the groove . in this embodiment , the end 29 of the keeper block is cut off at an angle so that when the keeper block lies in the groove 16 , the end surface 29 coincides with the surface 12 of the clamp block 6 , and the end surface 31 coincides with the top surface 14 of the clamp block 6 . obviously , these are not functional requirements . rather , they lend to the esthetic value of the structure . it will thus be seen that with the keeper block 22 mounted in the groove 16 of a clamp block 6 , with the machine screw 26 engaging the threads of the grommet bore 24 , the keeper block 24 may be wedgingly drawn into the groove 16 by tightening the machine screw , causing the keeper block to be cammed toward wall 18 , or it may be released so as to move in a direction out of the groove 16 , whereupon the keeper block moves away from the groove wall 18 . stated another way , with the machine screw 26 tightened securely in the bore 24 of the grommet 23 , the keeper block 22 is drawn tightly into the groove 16 so that the inclined surface 28 thereof lies contiguously against the inclined surface 19 of the groove . in this relationship , the opposite edge 32 of the keeper block lies spaced a predetermined distance from the inner wall surface 18 of the groove . by manipulating the machine screw 26 so as to release the keeper block 22 , the two inclined surfaces 19 and 28 of the clamp block 6 and keeper block 22 , respectively , move in relation to each other so that the keeper block moves in a direction out of the groove 16 , the inclined surfaces remaining contiguous and thus resulting in the elongated edge 32 of the keeper block 22 moving away from the inner wall surface 18 of the groove 16 , thus increasing the distance between the edge surface 32 and the inner wall surface 18 of the groove so as to accommodate an object inserted into the space between the keeper block and wall section 18 of the groove . by this mechanism , it will be seen that an appropriate member , such as the inclined member designated generally by the numeral 33 , may be releasably clamped securely to the base by inserting one end portion of the pedestal member 33 into the grooves 16 of the spaced clamp blocks 6 when the keeper blocks 22 have been loosened so as to increase the space between the edge surfaces 32 and the wall surfaces 18 sufficiently to accept the thickness of the pedestal member 33 . then , with the end edge of the pedestal 33 bearing against the top surface 4 of the base 3 , and the edge portions of the pedestal 33 caught in the groove 16 , albeit loosely , the screws 26 on the mutually facing clamp blocks 6 may be tightened so as to draw the keeper blocks 22 inwardly , deeper into the groove 16 , thus causing the inclined surfaces 19 and 28 to interact one with the other to diminish the space between the edge 32 of each keeper block and its associated wall member 18 of the groove , thus clamping between these two surfaces the lower end portion of the pedestal member 33 . the pedestal member 33 thus lies securely yet detachably attached to the base member 3 . referring to fig1 and 3 , it will there be seen that the pedestal member 33 comprises a generally rectangular elongated member , preferably fabricated from an appropriate length and width of lumber 34 , the opposed surfaces of which are covered by a sisal covering 36 appropriately secured to the opposite surfaces of the member 34 and retained thereon by any appropriate means such as by adhesive or appropriate fasteners ( not shown ). along the longitudinal edges of the member 34 , the sisal material 36 is enclosed within longitudinally extending channel members 37 which tightly grip the member 34 and the lateral edge portions of the sisal sheet 36 , thus retaining the edges closely confined within the channels . the channels 37 may be formed from an appropriate material such as plastic , although a metal channel may also be used . the channels 37 are press - fitted over the edges of the member 34 and sisal sheet 36 and when installed on the base 3 , it will be seen that the channel members fit into the groove 16 and are bound therein by the keeper blocks 22 . referring to fig9 and 10 , it will be seen that complementary clamp blocks designated generally by the numeral 38 and constructed and operating in the same manner as the clamp blocks 6 , including keeper blocks 22 , are mounted on a perch platform designated generally by the numeral 39 . in this instance , the perch platform 39 , to the underside of which the clamp blocks 38 are secured is adapted to be detachably clamped to the upper end portion of the pedestal member 33 as illustrated in fig1 so as to provide a flat surface 41 on the top of the perch platform 39 onto which a cat may leap so that it may perch above the floor and be in a position to survey activity within a room and to keep it safe from being stepped upon by foot traffic within the room in which the portable rubbing pedestal is stationed . since the clamp blocks 38 are identical to the clamp blocks 6 , including the keeper blocks 22 , in the interest of brevity , the description of this structure will not be repeated . suffice to say that the perch platform 39 may be clamped to or released from the upper end of the pedestal member 33 in the same manner as the lower end of the pedestal 33 is clamped to or released from the clamp blocks 6 . having thus described the invention , what is believed to be new and novel and sought to be protected by letters patent of the united states is as follows :
a rubbing pedestal for cats includes a flat supporting base incorporating clamp blocks for releasably clamping an upwardly extending pedestal to the base . the pedestal is a flat rectangular member covered on both flat sides with a woven sisal material into which a cat may sink its claws . the opposite end of the pedestal from the base supports a platform which functions as an elevated perch for a cat . the base , pedestal and platform are releasably secured together by two pairs of clamp blocks .