Instruments having a retractable member at both ends of said instrument

Claim 1

A WRITING INSTRUMENT COMPRISING A BARREL HAVING LOWER AND UPPER OPEN ENDS; A LOWER WRITING UNIT MOUNTED WITHIN SAID BARREL INCLUDING A LOWER WRITING POINT; AN UPPER WRITING UNIT MOUNTED WITHIN SAID BARREL INCLUDING AN UPPER WRITING POINT; A LOWER HOOD CARRIED BY SAID BARREL HAVING A LOWER OUTER END NORMALLY EXTENDING PAST THE LOWER END OF SAID BARREL, SAID LOWER OUTER END BEING LONGITUDINALLY MOVABLE RELATIVE TO SAID LOWER END OF SAID BARREL; AN UPPER HOOD CARRIED BY SAID BARREL HAVING AN UPPER OUTER END NORMALLY EXTENDING PAST THE UPPER END OF SAID BARREL, SAID UPPER END BEING LONGITUDINALLY MOVABLE RELATIVE TO SAID UPPER END OF SAID BARREL; RESILIENT MEANS URGING SAID WRITING UNITS OUTWARDLY RELATIVE TO SAID BARREL TOWARDS AN EXTENDED POSITION WHEREBY THEIR RESPECTIVE WRITING POINTS EXTEND THROUGH THE OUTER ENDS OF SAID HOODS; AND A SINGLE LATCHING MEANS ASSEMBLY DEFINING A POINT RETRACTED POSITION AND A POINT EXTENDED POSITION, SAID LATCHING MEANS ASSEMBLY BEING IN ENGAGEMENT WITH BOTH OF SAID UPPER AND LOWER WRITING UNITS, SAID LATCHING MEANS ASSEMBLY BEING SHIFTED BACK AND FORTH BETWEEN SAID POSITIONS IN RESPONSE TO LONGITUDINAL MOVEMENTS OF SAID LOWER WRITING UNIT OBTAINED BY SUCCESSIVE SEQUENCES OF PRESSING SAID LOWER WRITING POINT AND SAID LOWER OUTER END OF SAID LOWER HOOD INTO CONTACT WITH RIGID SURFACE TO FORCE SAID