Doll having an arm movement mechanism using a rear-facing lever

Information

  • Patent Grant
  • 6224456
  • Patent Number
    6,224,456
  • Date Filed
    Thursday, August 3, 2000
    24 years ago
  • Date Issued
    Tuesday, May 1, 2001
    23 years ago
Abstract
A doll includes a pair of arms, a pair of legs and a head supported by a doll torso. One of the doll arms is secured to the torso at a shoulder joint which includes the outer end of an arm movement mechanism. The arm movement mechanism includes an arm shaft pivotally supported at the shoulder joint of the doll at one end and having a ball at the interior end thereof. The arm movement mechanism within the doll further includes a slidably supported traveler having a spring urging the traveler toward one end of its motion. The traveler includes a rearwardly extending lever passing through an aperture formed in the doll torso. The traveler defines a socket which receives the ball end of the arm shaft in a pivotal attachment. As the user moves the lever upon the doll torso, the arm shaft is pivoted causing a corresponding pivotal movement of the doll arm.
Description




SPECIFICATION




1. Field of the Invention




This invention relates generally to dolls and toy figures and particularly to dolls and toy figures having limbs movable in response to a manually actuated mechanism.




2. Background of the Invention




Dolls having movable limbs are well known in the art and have been provided for many years. A great number of so-called “posable” dolls have been provided having limbs or other appendages which are directly movable by hand manipulation of the limb or appendage. The posable quality of such dolls and toy figures arises from their tendency to maintain a particular position once moved by the user. Other types of dolls and toy figures having movable limbs or other appendages utilize some type of movement mechanism to provide their movement. Such mechanized dolls and toy figures are generally categorized as either powered or manual. Powered mechanisms utilize some type of motor such as a battery-driven electric motor or a spring-driven wind-up motor to operate the mechanism. Manual movement mechanisms typically use an indirect movement, that is to say one or more limbs are movably supported upon the doll or toy figure such as arms or legs while an additional movable lever or tab is positioned elsewhere on the doll or toy figure. An operative drive mechanism couples the movement of the lever or tab to the movably supported limb to provide the desired movement as the lever or tab is manipulated. In many dolls and toy figures having movable limbs, the degree of movement of the movable limb is intended to resemble or replicate a particular well known movement undertaken by humans. For example, U.S. Pat. No. 3,955,311 issued to Lyons, et al. sets forth a MECHANISM FOR MOVING AN UPPER APPENDAGE OF A TOY FIGURE in which a push button on the upper side of the toy figure torso is hand-operated to transmit motion to a mechanism within the doll torso. An arm is pivotally movable upon the torso and coupled to the mechanism and further holds a toy sword. When the button is moved, the arm pivots raising and lowering the sword in a combat maneuver.




U.S. Pat. No. 4,126,961 issued to Barlow, et al. sets forth an ARTICULATED DOLL having a torso and pivotally supported head. A ball and socket joint supports a toggle which extends outwardly from the rear torso and inwardly into the torso cavity. A lever and pivot mechanism couples the movement of the interior end of the toggle to the head support to cause the doll's head to nod.




U.S. Pat. No. 3,758,982 issued to Lemelson, et al. sets forth an ACTIVITY DOLL having a hollow body and one or more pivotally mounted limbs. A push button mechanism is supported at the rear torso and an internal drive gear system converts the in and out movement of the button against the torso to pivotal movement of the limb. A similar mechanism is set forth in U.S. Pat. No. 4,069,613 also issued to Lemelson, et al.




U.S. Pat. No. 6,022,263 issued to Liu, et al. sets forth MECHANICAL TOY FIGURES having upper and lower torsos rotatably attached together with arms and legs rotatably secured to the upper torso. A spring connected to the lower torso and upper torso rotates the upper torso between first and second positions. A friction clutch retards or slows the torso movement. A gear drive is connected to the lower torso and is operative to move an arm shaft which in turn moves the arms.




U.S. Pat. No. 4,186,518 issued to Luke sets forth a KICKING DOLL WITH DETACHABLE TRIGGER MEANS in which a doll supports a pivotally movable leg and a gear drive system operative to cause the leg to undergo a rapid kicking motion. An external trigger is provided which is secured to the doll torso and operative to release the kicking mechanism.




U.S. Pat. No. 4,721,489 issued to Galoob sets forth an ILLUMINABLE FIGURE which includes a movement mechanism operative upon the doll to provide arm motion.




U.S. Pat. No. 4,802,879 issued to Terzian, et al. sets forth a DOLL WITH ROTATING AND BENDABLE ARMS having an infant doll figure supporting a pair of pivotally movable bendable arms. A rotatable wheel is supported at the rear torso of the doll and is coupled by a gear mechanism to arm bending and movement apparatus within the doll.




U.S. Pat. No. 5,334,069 issued to Liu, Dexter C. sets forth an ACTION CHARACTER FIGURE WITH SPARKING MECHANISM having a doll supporting a pivotable arm and a spark-producing mechanism. The pivoting arm and spark-producing mechanism are moved simultaneously by a common drive system.




U.S. Pat. No. 5,394,766 issued to Johnson, et al. sets forth a ROBOTIC HUMAN TORSO which simulates the size, appearance and movements of a human torso. The torso includes a combination of high speed rotary and linear actuators arranged in a geometry that enable anatomically correct human-like movement.




U.S. Pat. No. 5,545,072 issued to Arad, et al. sets forth an IMAGE-PROJECTIVE TOY having a torso supporting a projecting lens in the frontal surface thereof. A light source within the torso produces a beam of light directed forwardly and outwardly through the projecting lens. A rotatable wheel within the torso supports a plurality of film segments movable by rotation thereof into alignment with the light beam and projecting lens. Rotation of the film wheel is accomplished by a rearwardly extending shaft and a knob supported at the rear of the torso.




U.S. Pat. No. 4,504,241 issued to Dyson, et al. sets forth a TOY FIGURE WITH MANUALLY OPERABLE INGESTION SYSTEM which simulates eating and digestion in response to movement of a rear supported lever.




Additional examples of early doll structures having movable limbs are found in U.S. Pat. No. 2,381,897 issued to Geller, U.S. Pat. No. 2,764,841 issued to Birbaum, and U.S. Pat. No. 3,147,566 issued to Liu Hong Ong.




While the foregoing described prior art devices have to some extent improved the doll and toy figure art and have in some instances enjoyed commercial success, there remains nonetheless a continuing need in the art for evermore improved, interesting and amusing dolls and toy figures.




SUMMARY OF THE INVENTION




Accordingly, it is a general object of the present invention to provide an improved doll or toy figure. It is a more particular object of the present invention to provide an improved doll or toy figure which utilizes a simple but effective manually actuatable mechanism for moving a limb or appendage.




In accordance with the present invention, there is provided a doll comprising: a torso defining a rear surface having a slot formed therein, a shoulder socket and a torso interior; an arm having a ball end defining a slot, the ball end pivotably movable within the shoulder socket, an arm shaft having an outer end defining a shoulder flange received within the slot supporting the arm in the shoulder socket and an inner end extending inwardly into the torso interior, the inner end of the arm shaft defining an arm shaft ball; a traveler slidably movable within the torso interior having a lever extending rearwardly through the slot and an upper end defining a socket receiving the arm shaft ball, the traveler being movable between first and second positions causing the arm shaft to pivot between first and second angular positions; and a spring coupled to the traveler urging the traveler toward the first position, the traveler and the arm shaft cooperating to pivotally move the arm as the traveler is moved between the first and second positions and the arm shaft is pivoted between the first and second angular positions.











BRIEF DESCRIPTION OF THE DRAWINGS




The features of the present invention, which are believed to be novel, are set forth with particularity in the appended claims. The invention, together with further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, in the several figures of which like reference numerals identify like elements and in which:





FIG. 1

sets forth a rear perspective view of a doll having an arm movement mechanism constructed in accordance with the present invention;





FIG. 2

sets forth a partial front perspective view of the inventive doll of

FIG. 1

;





FIG. 3

sets forth a perspective assembly view of the present invention arm movement mechanism;





FIG. 4

sets forth a partially sectioned rear view of a doll having the present invention arm movement mechanism therein; and





FIG. 5

sets forth a partially sectioned view of the arm shaft portion of the present invention arm movement mechanism.











DESCRIPTION OF THE PREFERRED EMBODIMENT





FIG. 1

sets forth a rear perspective view of a doll constructed in accordance with the present invention and generally referenced by numeral


10


. It will be apparent to those skilled in the art that while the present invention is shown in a doll generally resembling a “fashion doll”, the present invention applies equally well to other types of dolls and other toy figures. Accordingly, as used herein, the term “doll” will be understood to include other types of dolls as well as different types of toy figures.




Doll


10


includes a torso


11


supporting a head


12


and a pair of legs


13


and


14


. Doll


10


further includes a pair of arms


15


and


16


(arm


16


seen in FIG.


2


). In accordance with the present invention, arm


15


is supported upon torso


11


at a shoulder joint


17


. The structure of shoulder joint


17


is set forth below in greater detail. However, suffice it to note here that arm


15


is pivotally supported upon torso


11


by shoulder joint


17


. A garment


20


having an aperture


21


formed therein is shown worn upon torso


11


. Aperture


21


facilitates the extension of a lever


22


to the exterior of doll


10


. In accordance with the operation of the present invention arm movement mechanism set forth below in greater detail, the user is able to grasp doll


10


in the fashion shown and is able to move lever


22


upwardly in the direction indicated by arrow


23


and downwardly in the direction indicated by arrow


25


. By means set forth below in

FIG. 4

in greater detail, the downward movement in the direction indicated by arrow


25


is achieved by overcoming the force of an internal spring within torso


11


. Conversely, the upward movement of lever


22


in the direction indicated by arrow


23


results from the release of lever


22


allowing the internal spring shown in FIG.


4


as spring


66


to restore lever


22


upwardly in the direction indicated by arrow


23


. In accordance with the operative mechanism set forth below, the downward movement of lever


22


causes arm


15


to pivot about shoulder joint


17


in the direction indicated by arrow


26


. Conversely, the upward movement of lever


22


causes arm


15


to pivot about shoulder joint


17


in the direction indicated by arrow


24


. The character of movement of arm


15


in response to the up and down movement of lever


22


varies with the pivotal positioning of arm


15


upon shoulder joint


17


.




Thus, in the forwardly extending arm position shown in

FIGS. 1 and 2

, movement of lever


22


results in a rotating or arm twisting motion. In contrast and with temporary reference to

FIG. 4

, the positioning of arm


15


in a downward or arms at the side position results in a pivotal movement of arm


15


toward torso


11


or away from torso


11


. Further and with continued temporary reference to

FIG. 4

, the positioning of arm


15


in a raised position results in pivoting arm


15


toward or away from head


12


in response to movement of lever


22


. Thus, in accordance with an important aspect of the present invention, the arm movement mechanism facilitates different types of arm movement in accordance with the posed arm position.





FIG. 2

sets forth a front perspective view of doll


10


having a torso


11


supporting a head


12


and arms


15


and


16


. Arm


15


is supported upon torso


11


at a shoulder joint


17


. A garment


20


is worn upon torso


11


and, as is set forth above in

FIG. 1

, includes an aperture


21


through which lever


22


extends.





FIG. 2

shows the twisting pivoting movement of arm


15


in response to movement of lever


22


(seen in FIG.


1


). Thus, with arm


15


extended generally forwardly as shown in

FIGS. 1 and 2

, the pivotal motion of arm


15


in response to movement of lever


22


is described by the twisting motion indicated by arrows


24


and


26


.





FIG. 3

sets forth a perspective assembly view of the present invention arm movement mechanism separated from the remainder of doll


10


. The movement mechanism includes three basic components, an arm shaft


30


, a traveler


50


and arm


15


itself. Arm


15


defines a spherical portion forming a shoulder ball


40


having a slot


41


formed therein. As is better seen in

FIG. 4

, arm


15


further includes a pin


46


extending into slot


41


.




Arm shaft


30


includes a ball


31


and a generally rectangular slide


32


in a spaced apart arrangement. Arm shaft


30


further includes a flange


33


spaced from slide


32


and a flange


34


. Flange


34


is spaced apart from flange


33


allowing arm shaft


30


to define a bearing portion


45


which as is set forth below in

FIG. 4

is movable upon a curved guide


68


. Arm shaft


30


further includes a generally cylindrical or disk-shaped arm flange


35


having a faceted aperture


36


formed therein. As is better seen in

FIG. 5

, slide


32


is formed upon shaft


64


as an inserted molded component resulting in a tight fit rotational attachment between slide


32


and shaft


64


. The structure of this rotational attachment is set forth in

FIG. 5

in greater detail. However, suffice it to note here that the rotational attachment between flange


33


and shaft


64


allows rotation of arm flange


35


with respect to slide


32


in the manner indicated by arrows


38


. This frictional and rotational attachment allows the rotational position of arm


15


about shoulder joint


17


(seen in

FIG. 2

) to be poseable.




Traveler


50


includes a shaft


51


supporting a ball end


52


within which a socket recess


53


is formed. Socket recess


53


defines an aperture


61


sufficient in size to receive ball


31


of arm shaft


30


in a force fit attachment. Traveler


50


further includes a pair of generally planar guide plates


54


and


55


positioned on each side of aperture


61


. Traveler


50


further includes an arm


57


supporting a rearwardly extending lever


22


and a bracket


58


. Bracket


58


in turn supports a flange


59


in a downwardly extending post


60


.




In operation, arm


15


is assembled to arm flange


35


by forcing arm flange


35


through slot


41


and allowing it to engage pin


46


within faceted aperture


36


. This engagement is preferably a snap-fit engagement. However, pin


46


may be separately fabricated and installed within shoulder ball


40


as desired. The resulting attachment of arm flange


35


and shoulder ball


40


of arm


15


provides a friction fit therebetween whereby the angular position of arm


15


upon arm flange


35


may be adjusted and “posed”. The assembly of arm shaft


30


to traveler


50


is accomplished by aligning ball


31


with aperture


61


of socket recess


53


and further aligning slide


32


with space


56


formed between plates


54


and


55


. Thereafter, assembly is completed by forcing ball


31


into socket


43


through aperture


61


. In the preferred fabrication of the present invention, ball


31


then fits within socket recess


53


with sufficient clearance to allow free pivoting movement therebetween. The position of slide


32


within space


56


aligns a pair of opposed sides of slide


32


between plates


54


and


55


such that rotation of slide


32


about the axis of arm shaft


30


is precluded and the remainder of armshaft


30


and arm


15


may be rotated and posed in the directions indicated by arrows


38


. At this point, the combined structure of arm


15


, arm shaft


30


and traveler


50


is ready for installation within the remainder of doll


10


.





FIG. 4

sets forth a partially sectioned rear view of doll


10


showing the interior of torso


11


. As described above, doll


10


includes a pair of legs


13


and


14


secured to torso


11


in accordance with conventional fabrication techniques. Doll


10


further includes a head


12


(seen in

FIG. 1

) which has been omitted in FIG.


4


. An arm


16


is pivotally secured to torso


11


utilizing a conventional fabrication shoulder joint. In accordance with the present invention, arm


15


is joined to torso


11


at a shoulder joint generally referenced by numeral


17


. Torso


11


defines a socket surface


37


which cooperates with ball end


40


of arm


15


to facilitate the pivotal movement of arm


15


. Arm


15


is shown in a downwardly extending position in solid-line representation in FIG.


4


.




In further accordance with the present invention, a spring channel


65


is formed within the interior of torso


11


and supports a spring


66


. Torso


11


further includes an interior plate


78


defining an aperture


79


therein. A pair of curved guides


67


and


68


extend upwardly from interior plate


78


. An arm shaft


30


includes an arm flange


35


secured within a slot


41


of shoulder ball


40


in the manner set forth above in FIG.


3


. Arm shaft


30


further includes a pair of flanges


33


and


34


received along each side of curved guide


68


. A bearing surface


45


extends between flanges


33


and


34


and moves upon curved guide


68


. Arm shaft


30


further includes a bail


31


received within socket


53


of traveler


50


and a slide


32


received between plates


55


and


54


(plate


54


seen in

FIG. 3

) of traveler


50


. Traveler


50


further includes a ball end


52


which moves upon curved guide


67


. Traveler


50


further includes a shaft


51


extending downwardly through aperture


79


of interior plate


78


. An arm


57


extends transversely upon traveler


50


beneath interior plate


78


and supports a rearwardly extending lever


22


. A bracket


58


extends downwardly from one end of arm


57


and supports a flange


59


and a post


60


. Post


60


engages the upper end of spring


66


supported within spring channel


65


of torso


11


.




In operation, spring


66


urges traveler


50


upwardly in the direction indicated by arrow


73


until arm


57


abuts the undersurface of interior plate


78


. At this point, the position of traveler


50


is established as shown in solid-line representation in FIG.


4


. correspondingly, arm shaft


30


assumes the pivotal position within shoulder socket


37


shown in solid-line representation. It will be noted that the relative positions of traveler


50


and arm shaft


30


in the solid-line position shown is facilitated by the pivoting of ball


31


within socket


33


.




Once the user initiates operation of doll


10


, lever


22


is orced downwardly in the direction indicated by arrow


70


overcoming the force of spring


66


and moving traveler


50


downwardly to the dashed-line position shown in FIG.


4


. Correspondingly, the downward movement of traveler


50


pivots arm shaft


30


to the dashed-line position shown. Curved guides


67


and


68


facilitate this downward pivotal movement. The engagement of arm


15


with arm shaft


30


described above causes arm


15


to pivot outwardly in the direction indicated by arrow


71


to the dashed-line position.




The user thereafter releases lever


22


allowing spring


66


to move traveler


50


upwardly in the direction indicated by arrow


73


and returning it to the solid-line position shown. This upward movement of traveler


50


pivots arm shaft


30


correspondingly and causes arm


15


to pivot toward torso


11


in the direction indicated by arrow


74


. Thus, as the user continues to moves lever


22


downwardly and release it, arm


15


undergoes a pivotal movement between the solid-line position shown and the dashed-line position shown in the directions indicated by arrows


71


and


74


.




In accordance with the present invention, arm


15


may be pivoted with respect to arm shaft


30


to “pose” arm


15


and thereby adjust the type of motion imparted to arm


15


as traveler


50


is moved. Thus, in addition to the side-to-side motion indicated by arrows


71


and


74


, arm


15


may be pivoted forwardly to the position shown in

FIG. 1

in which case the above-described twisting movement of arm


15


occurs in response to movement of lever


22


. It will be recalled by returning to

FIGS. 1 and 2

that this twisting motion of arm


15


is indicated by arrows


24


and


26


therein.




Returning to

FIG. 4

, a further alternative posing of arm


15


may be achieved by pivoting arm


15


upwardly to an arms raised position as shown in dashed-line representation. In this event, the movement of traveler


50


downwardly in the direction indicated by arrow


70


causes arm


15


to move in the direction indicated by arrow


72


toward the head of doll


10


(head


12


seen in FIG.


1


). Conversely, the release of lever


22


allows spring


66


to return traveler


50


to the solid-line position shown in

FIG. 4

causing arm


15


to pivot away from head


12


in the direction indicated by arrow


75


.




Thus, in accordance with an important aspect of the present invention, the ability of arm


15


to be alternatively posed allows a corresponding variation in the type of motion achieved by the arm movement mechanism. It will be recalled from the descriptive material associated with

FIG. 3

that arm shaft


30


is formed of a pair of rotationally movable components which allows arm flange


35


(also seen in

FIG. 3

) to be rotatable about the axis of arm shaft


30


. Returning to

FIG. 4

, it will be apparent that this ability of pivotal movement allows arm


15


to be pivoted between the downwardly extending position shown in solid-line representation to the forwardly extending position shown in

FIGS. 1 and 2

and to the arms raised position shown in dashed-line representation in FIG.


4


.





FIG. 5

sets forth a partially sectioned view of arm shaft


30


. Of importance to note in

FIG. 5

is the frictional and rotational coupling provided between slide


32


and shaft


64


of arm shaft


30


. More specifically, arm shaft


30


includes a ball


31


, a shaft


64


and a generally rectangular slide


32


. Slide


32


is preferably insert molded upon a shaft


64


such that slide


32


defines an internal bore


42


which is tight upon shaft


64


to provide the above-mentioned frictional fit. Arm shaft


30


further includes a flange


34


and a bearing


45


positioned between flange


34


and flange


33


. Finally, arm shaft


30


includes a generally disk-shaped arm flange


35


having a faceted aperture


36


formed therein. Thus, arm flange


35


is rotatable and poseable about the axis of arm shaft


30


in the directions indicated by arrows


44


due to the frictional attachment of slide


32


upon shaft


64


. It will be noted that the cooperation of curved guide


68


(seen in

FIG. 4

) upon bearing


45


and between flanges


33


and


34


prevents separation of arm shaft ball


31


from socket


53


when arm shaft


30


is assembled within the present invention doll. This, in turn, prevents the inadvertent separation of arm


15


from torso


11


(seen in

FIG. 4

) once arm shaft


30


is assembled within the doll torso.




What has been shown is a doll having an arm movement mechanism which responds to a rear facing lever to provide a posable arm and movement thereof. The structure shown and described is readily fabricated of a minimum number of low cost mass-produced components. The majority of components utilized therein may be readily fabricated using conventional injection molded plastic apparatus.




While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects. Therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.



Claims
  • 1. A doll comprising:a torso defining a rear surface having a slot formed therein, a shoulder socket and a torso interior; an arm having a ball end defining a slot, said ball end pivotably movable within said shoulder socket; an arm shaft having an outer end defining a shoulder flange received within said slot supporting said arm in said shoulder socket and an inner end extending inwardly into said torso interior, said inner end of said arm shaft defining an arm shaft ball; a traveler slidably movable within said torso interior having a lever extending rearwardly through said slot and an upper end defining a socket receiving said arm shaft ball, said traveler being movable between first and second positions causing said arm shaft to pivot between first and second angular positions; and a spring coupled to said traveler urging said traveler toward said first position, said traveler and said arm shaft cooperating to pivotally move said arm as said traveler is moved between said first and second positions and said arm shaft is pivoted between said first and second angular positions.
  • 2. The doll set forth in claim 1 wherein said torso includes a first curved guide for guiding said arm shaft ball as said arm shaft pivots.
  • 3. The doll set forth in claim 2 wherein said torso includes a second curved guide and wherein said arm shaft includes first and second flanges on each side of said second guide.
  • 4. The doll set forth in claim 3 wherein said arm shaft includes a slide, frictionally supported near said arm shaft ball, having opposed facets and wherein said traveler includes a pair of plates adjacent said socket overlapping said opposed facets and preventing said slide from rotating.
  • 5. The doll set forth in claim 4 wherein said slide frictionally resists rotation of said arm shaft.
  • 6. The doll set forth in claim 1 wherein said arm shaft includes a slide, frictionally supported near said arm shaft ball, having opposed facets and wherein said traveler includes a pair of plates adjacent said socket overlapping said opposed facets and preventing said slide from rotating.
  • 7. The doll set forth in claim 6 wherein said slide frictionally resists rotation of said arm shaft.
  • 8. The doll set forth in claim 1 wherein said torso includes a first curved guide for guiding said arm shaft ball as said arm shaft pivots.
  • 9. A doll comprising:a torso defining a rear surface having a slot therein, a torso interior, a shoulder socket, a first curved guide proximate said shoulder socket, a second curved guide spaced from said first curved guide; a doll arm having a ball end received within said shoulder socket, said ball end defining a slot; an arm shaft having an outer end defining an arm flange received within said slot, a pair of flanges on each side of said first curved guide, and an inner end defining an arm shaft ball; a traveler, slidably supported within said torso interior and movable between first and second positions, having a lever extending through said slot in said torso and a socket receiving said arm shaft ball; and a spring coupled to said traveler urging said traveler toward said first position, said lever being moved within said slot to move said traveler between said first and second positions and causing said arm shaft and said arm to pivot about said shoulder socket.
  • 10. The doll set forth in claim 9 wherein said arm shaft includes a faceted slide frictionally secured between said ball and said second flange and wherein said traveler includes a pair of plates engaging said faceted slide.
  • 11. The doll set forth in claim 10 wherein said arm shaft includes a rotational coupling securing said second flange to said slide.
US Referenced Citations (19)
Number Name Date Kind
2381897 Geller Aug 1945
2764841 Birnbaum Oct 1956
3147566 Ong Sep 1964
3758982 Lemelson et al. Sep 1973
3955311 Lyons et al. May 1976
4069613 Lemelson et al. Jan 1978
4126961 Barlow et al. Nov 1978
4186518 Luke Feb 1980
4504241 Dyson et al. Mar 1985
4579542 Meyer et al. Apr 1986
4721489 Galoob Jan 1988
4723932 Kelley et al. Feb 1988
4802878 Terzian et al. Feb 1989
5334069 Liu Aug 1994
5394766 Johnson et al. Mar 1995
5545072 Arad et al. Aug 1996
6022263 Liu et al. Feb 2000
6062941 Cook May 2000
6132285 Feldman Oct 2000