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A latch for a Compact PCI board, which incorporates inject and eject and engage and disengage functions, has a low profile shape, whereof a fold-down handle operates through a total arc of 90 degrees. Enhanced electromagnetic compatibility (EMC) is provided, by more efficient EMC shielding and by r

A latch for a Compact PCI board, which incorporates inject and eject and engage and disengage functions, has a low profile shape, whereof a fold-down handle operates through a total arc of 90 degrees. Enhanced electromagnetic compatibility (EMC) is provided, by more efficient EMC shielding and by reduced electromagnetic force (EMF) radiation pass-through. The latch, in its inject/eject operation, undergoes a two-phase motion, which utilizes a rotary motion to insert/extract the board from electrical connection, and utilizes a linear motion to engage/disengage the latch pawl from the chassis (keeper). A separate alignment pin block, normally carrying a lead guide pin and a seating guide pin, is independent of the structure for the base of the latch. This permits the alignment pin block to be mounted to the inside of the faceplate and the latch to be mounted to the outside of the faceplate. By so doing, the cumulative (aggregate) area of the opening(s) through the faceplate is reduced, which thereby increases the EMC (electromagnetic compatibility) of the design by reducing EMF radiation pass-through.

대표청구항 ▼

What is claimed is: 1. An eject/inject latch for electronic component board, being mountable thereon, said component board being mountable in a chassis having a keeper member, comprising: a pawl suitable for engaging a chassis mounted keeper; a handle connected to said pawl for operating said pawl

What is claimed is: 1. An eject/inject latch for electronic component board, being mountable thereon, said component board being mountable in a chassis having a keeper member, comprising: a pawl suitable for engaging a chassis mounted keeper; a handle connected to said pawl for operating said pawl into and out of engagement with said keeper; first camming means connected to said handle for guiding said handle motion in a rotary motion about a first pivot point and thereafter guiding said handle motion in a rotary motion about a second pivot point; and second camming means connected to said pawl for guiding said pawl in separate and sequential motions being a rotary motion and a longitudinal motion the order of said motions being dependent upon the inject or eject function. 2. The latch of claim 1, also including a base, wherein said handle rotation about said first and second pivot points is with respect to said base, and wherein said pawl rotary motion and said longitudinal motion is with respect to said base and to said keeper. 3. The latch of claim 2, wherein said base includes a pair of spaced apart mirror image base plates said base plates each including a plurality of mirror image slots, wherein a first portion of said slots controls said handle pivot point location and a second portion of said slots controls the sequential motion of said pawl. 4. The latch of claim 1 wherein said handle is elongate and has a pick-up slot at a first end thereof, a pivot pin adjacent said pick-up slot, and a cam pin off-set from said pivot pin. 5. The latch of claim 4, wherein said handle also includes a transversely projecting hook mounted adjacent the end opposite said pick-up slot, and a catch lever connected to said handle for operating said projecting hook. 6. The latch of claim 4, wherein said pawl has an elongate arm portion with a claw-shaped chassis engagement portion at one end, said pawl also having tear-drop shaped pivot stub shafts adjacent said claw-shaped portion, and cam pins at said opposite end of said pawl arm. 7. The latch of claim 6, also including a base carrying said camming means, said camming means including an L-shaped cam slot wherein a said pawl tear-drop shaped stub shaft operates, a first oval pivot opening wherein a said handle pivot pin operates, and an arc slot wherein a said handle off-set cam pin operates. 8. An eject/inject latch for electronic component board, being mountable to a face plate thereon, comprising: a pawl suitable for engaging a keeper; a handle connected to said pawl for operating said pawl; camming means for guiding said handle in a rotary motion sequentially about two separate pivot points, and for guiding said pawl in a rotary and then in a longitudinal motion, said camming means having a base supporting said pawl and said handle, said base including a pair of spaced apart plates connectable to said component board faceplate, each base plate having a plurality of slots; and a detachable alignment block connectable to said latch once said latch is mounted to said faceplate. 9. The latch of claim 8, also including a faceplate extension including projecting tabs and a pawl opening through which said pawl operates. 10. The latch of claim 9, wherein said detachable alignment block is connected to said latch by screws extending through said extension tabs. 11. An injector latch for a PCI board, said PCI board having a faceplate, comprising: a base member mountable on said faceplate; a faceplate extension having projecting tabs with a slot in each tab, each said tab slot being abutted to said base member; an alignment block connectable to said base member; a claw-shaped pawl carried on said base member for engagement with a keeper; and a handle carried on said base member and operable to move said pawl wherein said pawl rotates and then laterally withdraws from said keeper as said handle is operated for the latch opening operation. 12. The injector latch of claim 11, also including a catch for locking said handle to said base member. 13. The injector latch of claim 12, wherein said catch includes a plate member, a hook member projecting transversely from said plate member, and a biasing spring, said plate member being pivotally connected to said handle. 14. The injector latch of claim 13, wherein said pawl rotates about 15 degrees as said handle is opened about 75 degrees, and wherein said pawl is laterally withdrawn as said handle rotates open from about 75 to 90 degrees. 15. An injector-ejector latch, comprising: a base member; a pawl connected to said base member for engaging a keeper position; and a handle connected to said pawl and said base member, said handle being rotatably operable from a closed position to a fully open position; wherein as said handle is rotated about a first pivot point from said closed position to a position intermediate before said fully open position whereby said handle causes said pawl to rotate from a first closed position to a second intermediate position; and wherein as said handle is thereafter rotated about a second pivot position from said handle intermediate position to said fully open position, whereby said handle causes said pawl to laterally retract from said keeper position, said pawl rotation and lateral retraction motions being separate and sequential. 16. The injector-ejector latch of claim 15, wherein said base member carries an arc slot opening, an L-shaped slot opening, and a first and second elongated pivot openings. 17. The injector-ejector latch of claim 15, wherein for said inject function, the movement of said handle and of said pawl are in reverse order. 18. An injector-ejector latch, comprising: a base member carrying an arc slot opening, an L-shaped slot opening, and a first and second elongated pivot openings; a pawl connected to said base member; a handle connected to said pawl and said base member, being rotatably operable between a closed and fully open positions, wherein as said handle rotation reaches an intermediate position between closed and fully open, said handle causes said pawl to rotate from a first closed position to a second position, and as said handle is rotated from said intermediate position to said fully open position, said handle causes said pawl to laterally retract to complete said eject function; wherein said pawl has a first pivot pin including a tear-drop shaped lobe, said pawl first pivot pin engaging said base member L-shaped slot opening, and a second pivot pin engaging said base member second elongated pivot opening. 19. The injector-ejector latch of claim 18, wherein said handle has an open-ended slot opening at first end thereof, a first pivot pin adjacent said handle open-ended slot opening wherein said handle first pivot pin engages said base member first elongated pivot opening, and a second pivot pin adjacent said handle first pivot pin wherein said handle second pivot pin engages said base member arc slot opening. 20. The injector-ejector latch of claim 19, wherein said base member includes a cylindrically shaped spacer, and wherein said pawl includes a bump-in for engaging said base member spacer, wherein each of said pawl and said handle pivot pins cams against their respective engaged opening for longitudinal movement there within, and wherein said latch also includes a catch member having a plate member pivotally attached to said handle and a hook member engageable with said base member, said plate member being resiliently biased to the open position away from said handle. 21. The injector-ejector latch of claim 20, wherein said base member also includes an abutment surface and wherein said handle abuts said base member abutment surface when said handle is in the fully open position. 22. The injector-ejector latch of claim 18, wherein for said inject function, the movement of said handle and of said pawl are in reverse order.