Key operable restraining device with spike engaging member

A key operated restraining device adapted to create a securing loop of adjustable dimension, comprising:

• a locking head portion having an interior;
• an elongated strap portion having a proximal end connected to said head portion and a distal free end, said strap portion including a smooth first surface thereof, said strap portion having sufficient length such that said free distal end is insertable through said locking head portion thereby to form a securing loop of adjustable dimension;
• a support block disposed in the interior of said head portion and termination in spaced relation to an interior wall surface thereof;
• and
• a pawl member disposed in the interior of said head portion and terminating in spaced relation to said wall surface, said pawl member including a locking structure disposed thereon, said pawl member, said support block and said wall forming a slideway sized for close fitting mated engagement with said strap portion, said strap portion being slideably movable in a first direction to reduce the dimension of said securing loop and in a second direction to expand the dimension of said securing loop, said pawl member connected to said locking head by a resilient hinge structure with a supporting spike member biasing said pawl member into a locking position, wherein said spike member being operative to lockably engage said strap and a release position wherein said spike member is disengaged from said strap, said pawl member operative when in the locking position to permit movement of said strap in the first direction but to prevent movement of said strap in the second direction, said pawl member and said support block configured to form a keyway therebetween sized and adapted to receive said key therein, said keyway oriented along a keyway axis that is transverse to said slideway and including a post element that is located centrally in the keyway axis, said pawl member constructed such that rotation of said key in a first rotational direction moves said pawl element from the locking position to the release position;
• said spike member constructed at least in part of metal, said spike member having a sharpened metal edge that engages the surface of said strap such that said metal tip is partially embedded into said strap when in an engaging position.