a convertible toy 20 embodying the principles of the invention is illustrated in fig1 and 2 . as shown , the toy 20 comprises an activity unit 30 supported on a base 40 . the base 40 has two support members 42 , each having a pair of legs 44 . the activity unit 30 , shown in fig3 - 5 , has an elongated shape with generally parallel front and back faces 30 a , 30 b and a rounded top 30 c . colored keys 32 are arranged across the front face 30 a of the activity unit 30 , as shown in fig3 . the keys 32 are transparent or opaque colored plastic and have a light bulb 32 a mounted inside . audio speakers 34 are arranged on the front face 30 a at each end of the keys 32 . the keys 32 and speakers 34 provide the sensory output of the toy 20 . the keys 32 light up to provide a visual output and the speakers 34 play music to provide an audio output when the toy 20 is activated . the toy 20 is activated or actuated by pressing one of several switches . a rocker switch 36 , shown in fig7 mounted inside the rear face 30 b of the activity unit 30 , is activated or actuated , through motion of a rocker bar 50 . the rocker bar 50 is shown on the activity unit 30 in fig4 and in a perspective view in fig6 . the rocker bar 50 is rotatably mounted on the rear face 30 b of the activity unit 30 with two hinges 52 . one of the hinges 52 has an integral cam surface 52 a which interacts with a leaf spring 38 to depress the rocker switch 36 , shown in fig7 . the rocker bar 50 can be moved between a deployed position , shown in fig4 and a stowed position , shown in fig5 . in the deployed position , toys can be suspended from hooks 56 along the lower edge of the rocker bar 50 , shown in fig6 . when the rocker bar 50 is moved to the stowed position , the cam 52 a rotates out of engagement with the leaf spring 38 , and activation or actuation of the rocker switch 36 is prevented . a key switch 32 b , shown in fig3 may also be used to activate or actuated the toy 20 . a key switch 32 b is mounted beneath each key 32 on the front face 30 a of the activity unit 30 . pressing on a key 32 causes the key 32 to contact and depress the key switch 32 b . lastly , a sound effects switch 60 a , shown in fig3 is mounted on the front face 30 a of the activity unit 30 beneath the sound effects button 60 . pressing on the sound effects button 60 will depress the sound effects switch 60 a . the activation of the toy 20 to produce a sensory output is controlled by an electronic control circuit . in a preferred embodiment , power is supplied by batteries stored in a battery compartment 62 on the back 30 b of the activity unit 30 , shown in fig4 . a schematic of the control circuit is shown in fig9 . as shown , an output control unit 72 receives an input signal from one of the switches and , in response , sends a signal to the output devices 32 , 34 to produce the proper sensory output . an output mode of the output control unit 72 is set using a mode switch 70 located on top 30 c of the activity unit 30 , shown in fig3 . the mode switch 70 has three settings : off , short play , and long play . for a given output mode , the sensory output varies depending on whether the rocker bar 50 or a key 32 is used to initiate the output . the volume of the audio output can be adjusted between a high and a low setting with a slider switch 64 on the rear face 30 b of the activity unit 30 . the preferred embodiments the operation of the output control unit 72 will be described with reference to each configuration of the toy 20 . the activity unit 30 may be positioned on the support members 42 in a vertical orientation and a horizontal orientation , corresponding to an infant configuration and a toddler configuration , respectively . the activity unit 30 is secured in a given orientation through the engagement of interlocking elements 82 , 86 on the activity unit 30 and the support members 42 . a detailed view of the interlocking elements 82 , 86 is shown in fig8 . first interlocking elements 82 are arranged at each end of the activity unit 30 . the first interlocking elements 82 have a four - sided hub 84 . two adjacent sides of the hub 84 have a projection 84 a on an outer surface . the hub 84 also has a threaded opening 84 b in the center . second interlocking elements 86 are arranged on an upper portion of the support members 42 . the second interlocking elements 86 have a housing with a four - sided recess 86 a for receiving the hub 84 . three sides of the recess 86 a are formed with an indentation 86 b for receiving a hub projection 84 a . this arrangement of indentations 86 b allows the recess 86 a to receive the hub 84 in two different orientations . a captive screw 88 in the support member 42 is threaded into the opening 84 b to draw the interlocking elements 82 , 86 together and hold them in locked engagement . in the infant configuration , the activity unit 30 is oriented vertically and several shapes 54 are suspended from the rocker bar , as shown in fig1 . the toy 20 in this configuration can be used to entertain an infant lying underneath or a small child sitting in front of the toy . although the keys 32 are active , the preferred way of producing a sensory output is by moving the hanging shapes 54 . the shapes 54 can be moved by a parent or by a child sitting in front of the toy . when the shapes 54 are moved , the rocker bar 50 is caused to pivot , which causes the cam 52 a to press on the leaf spring 38 , which in turn activates the rocker switch 36 . when the mode switch 70 is set on short play mode and the rocker switch 36 is activated , one song will play . while the song is playing , the keys 32 will light up in a random pattern . there are a number of songs stored in the control unit memory , each song having a unique light display associated with it . if the rocker switch 36 is activated additional times , the control unit 72 will cycle through the songs stored in memory , each time playing the next song and displaying its associated light pattern . in the long play mode , activation of the rocker switch 36 will result in ten minutes of continuous music . during the musical output , the control unit 72 will play the stored songs sequentially , and during each song , display the light pattern associated with the song that is playing . several steps are required to convert the toy 20 to the toddler configuration . first the hanging shapes 54 are removed from the rocker bar 50 and are placed on hooks 46 on the support members 42 , shown in fig2 . next , the rocker bar 50 is pivoted to the stowed position , taking the cam 52 a out of contact with the leaf spring 38 . the rocker bar is shown in the stowed position in fig5 and in fig7 in broken lines . with the rocker bar 50 in the stowed position , the rocker switch 36 is effectively disabled . next , the screws 88 are loosened , allowing the interlocking elements 82 , 86 to come out of engagement . the activity unit 30 is then rotated into a horizontal orientation . the interlocking elements 82 , 86 are engaged , and finally , the screws 88 are tightened to lock the activity unit 30 in position . the toy 20 is shown in the toddler configuration in fig2 . as shown , the activity unit 30 is oriented horizontally with keys 32 arranged on an upper surface . in the toddler configuration , the toy 20 can be used to entertain small children standing in front of the toy 20 and playing it , similar to a piano . here , pressing the keys 32 is the preferred way of producing a sensory output . when a key 32 is pressed , the key switch 32 b beneath the key 32 is activated and an output is produced . in both the short play and long play output modes , a key 32 will light up when it is pressed . in the short play mode , when a key 32 is pressed , a single tone is produced . in the long play mode , when a key 32 is pressed , a segment of a song is played . if any key 32 is subsequently pressed , the next segment of the song will be played . the child user is therefore able to “ compose ” pieces of music using either discrete tones or segments of songs . the effects button 60 , located above the keys 32 on the activity unit 30 , is active in both the infant and toddler configurations . the effects button 60 produces an audio output independently of the output mode setting . pressing the effects button 60 will produce an audio output comprising one of several stored sound effects . if the effects button 60 is repeatedly pressed , the stored sound effects will be played sequentially . other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein . it is intended that the specification and examples be considered as exemplary only , with a true scope and spirit of the invention being indicated by the following claims .
a child &# 39 ; s toy is provided which is convertible between an infant &# 39 ; s gym and a toddler &# 39 ; s piano . in the infant configuration , a small child can be placed under or seated in front of the toy within reach of hanging shapes . when the infant moves the hanging shapes , a sensory output of music and lights is produced through audio speakers and lighted keys . the infant &# 39 ; s gym can be converted into a toddler configuration , which has keys arranged on top , resembling a piano . a toddler standing in front of the piano can produce a sensory output of music and lights by pressing the keys . a mode switch can be adjusted to vary the duration of the sensory output .