Helmet mounted display unit with fastener device

Claim 2

In a coupling device, the combination comprising: a pair of coupling members comprising first and second tubular sleeve members detachably joined end-to-end in axial alignment and each including a circular lip which abuts the circular lip of the other member when said pair of members are joined; a manually translatable body structure slidably mounted within one of said sleeve members as to be axially movable with respect thereto between first and second axial positions when said body structure is actuated, resilient means disposed within said one sleeve member and acting on said body structure to urge it axially away from the other of said sleeve members to said first axial position; pivotted latch means carried by said body structure and being arranged for latching engagement with a face of said circular lip of said other sleeve member to latch said one sleeve member to said other sleeve member when said body structure is in said first axial position; resilient means carried by said body structure for urging said latch means into latching engagement with said face of said circular lip of said other sleeve member when said pair of members are joined; and a cam face associated with said one sleeve member and located adjacent said latch means so that axial movement of said body structure from said first to said second position will cause said latch means to move axially with said body structure relative to said cam face whereby said cam face acts upon said latch means against the force exerted upon said latch means by the last mentioned resilient means to pivot said latch means out of latching engagement as aforesaid to thereby unlatch said pair of members for unjoining the same.

Claim 3

The combination comprising: a first cylindrical sleeve member having a first circular, conical lip at its back end, a second cylindrical sleeve member having a second circular, conical lip at its front end and a base at its rear end; said first and second members being in axial relation with said first and second lips abutting one another and being rotatable relative to one another with said first and second members defining a cavity; a support hub centrally disposed within said cavity, said support hub having a back end and being mounted within said first member so as to be capable of limited axial movement in opposite directions with respect thereto; centering means comprised by said base and said back end of said support hub arranged to cooperate with said lips of said members to facilitate axial alignmnet of said members; said support hub including a front, outer face disposed within the front end of said first member and accessible therethrough; said support hub including circumaxial recesses each having a respective latch disposed therein that is pivotted for rotation in a radial plane about an axis near the front end of the support hub and that extends backwardly into the second circular lip of said second member; each latch including a hook at its distal end in hooked engagement with a back face of said second lip; spring means for urging each latch outwardly of its recess; spring means arranged within said first member for urging said support hub axially forwardly with respect to said first member; surface means arranged within said first member to urge each latch inwardly of its recess about its pivot axis when said outer face of said support hub is pushed axially rearwardly with respect to said first member to thus cam the radially outermost edges of said lAtches to pivot said latches inwardly into said recesses and thereby disengage said hooks from said back face of said second lip.

Claim 4

The combination comprising: a first cylindrical sleeve member having a first circular, conical lip at its back end, a second cylindrical sleeve member having a second circular, conical lip at its front end and a base at its rear end; said first and second members being in axial relation with said first and second lips abutting one another and being rotatable relative to one another with said first and second members defining a cavity; a support hub centrally disposed within said cavity, said support hub having a back end and being mounted within said first member so as to be capable of limited axial movement in opposite directions with respect thereto; centering means comprised by said base and said back end of said support hub arranged to cooperate with said lips of said members to facilitate axial alignmnet of said members; said support hub including a front, outer face disposed within the front end of said first member and accessible therethrough; said support hub including circumaxial recesses each having a respective latch disposed therein that is pivotted for rotation in a radial plane about an axis near the front end of the support hub and that extends backwardly into the second circular lip of said second member; each latch including a hook at its distal end in hooked engagement with a back face of said second lip; spring means for urging each latch outwardly of its recess; spring means arranged within said first member for urging said support hub axially forwardly with respect to said first member; surface means arranged within said first member to urge each latch inwardly of its recess about its pivot axis when said outer face of said support hub is pushed axially rearwardly with respect to said first member to thus cam the radially outermost edges of said lAtches to pivot said latches inwardly into said recesses and thereby disengage said hooks from said back face of said second lip.