Large deflection constrained insulation displacement terminal and connector
View Patent ↗An improved insulation displacement terminal (IDT) includes opposed spaced fingers having outer edges with first and second abutment sections adjacent the ends of the outer edges. A resilient spring-like mid-section in the finger between the abutment sections applies a generally normal force to a wire captured between the inner edges of opposed fingers of the IDT. The resilient spring-like mid-section of each finger may be provided by narrowing the width of each finger between the abutment sections such as by recessing the outer edges from the outer edges of the abutment sections or by providing slots or openings in the mid-section of the fingers. Corners of inner edges of the fingers are smoother and inner edges are generally planar to provide a large contact area between the fingers and a wire disposed therebetween. The IDT is mounted within a housing to provide an insulation displacement connector (IDC).
1. An insulation displacement terminal for mounting within a terminal receiving slot in a housing of an insulation displacement interconnection system, the housing having opposed spaced end walls, the insulation displacement terminal comprising:
a base portion having first and second opposing sides;
a contact portion extending from the first side of the base portion for making electrical contact with the insulation displacement terminal; and
opposed fingers each extending from the second side of the base portion to a distal end, the opposed fingers having a length and having outer edges and opposed inner edges spaced from one another so as to make electrical contact with a wire disposed between the opposed inner edges, the outer edges of each finger including a first abutment section proximal to the base portion and a second abutment section adjacent the distal end of the finger respectively, the first and second abutment sections configured to abut an adjacent end wall of the terminal receiving slot when the insulation displacement terminal is disposed within the housing to constrain the outer edge of the respective finger against outward movement at the respective abutment sections, each finger having a resilient spring-like mid-section along at least a portion of the length of the finger between the first and second abutment sections to permit outward deformation of the inner edge of the finger upon disposal of a wire between the opposed spaced fingers adjacent the finger mid-sections,
wherein each finger includes at least one opening within the mid-section to provide the resilient spring-like mid-section.
2. The insulation displacement terminal of claim 1 wherein a portion of the outer edge between the first and second abutment sections in inwardly recessed toward the inner edge such that each finger has a width that is narrower in the mid-section to provide a thinned resilient spring-like mid-section.
3. The insulation displacement terminal of claim 1 wherein the fingers have smooth corners along at least a wire contact area of the inner edges.
4. The insulation displacement terminal of claim 1 wherein the inner edges of opposed fingers are generally planar along at least a portion of the length of the fingers.
5. The insulation displacement terminal of claim 1 wherein the inner edges of each one of the opposed fingers includes a scraper member adjacent the end of the respective finger distal from the base portion, the scraper members having inner edges spaced apart by a distance slightly less than a diameter of a wire intended for use with the insulation displacement terminal.
6. The insulation displacement terminal of claim 1 wherein the first abutment sections includes an outwardly extending barb configured to engage the end walls of the slot to retain the terminal within the housing when the insulation displacement terminal is disposed therein.
7. The insulation displacement terminal of claim 1 wherein the base portion includes flanges extending outwardly of the fingers, the flanges having a lower edge configured to abut a ledge within the housing to define an insertion depth of the terminal when the terminal is inserted within the housing.
8. An insulation displacement connector comprising:
a housing having a terminal receiving slot extending into the housing from an open end of the housing, the terminal receiving slot having first opposed end walls spaced apart by a first distance; and
an insulation displacement terminal disposed with the terminal receiving slot of the housing, the insulation displacement terminal including:
a base portion having first and second opposing sides;
a contact portion extending from the first side of the base portion; and
a pair of opposed spaced fingers, each extending from the second side of the base portion to a distal end, the opposed fingers having a length and having outer edges and opposed inner edges spaced from one another so as to make electrical contact with a wire disposed between the opposed inner edges, the outer edges of each finger including a first abutment section proximal to the base portion and a second abutment section adjacent the distal end of the finger respectively, the first and second abutment sections configured to abut an adjacent one of the first opposed end walls when the insulation displacement terminal is disposed within the terminal receiving slot to constrain the outer edge of the respective finger against outward movement at the respective abutment sections, each finger having a resilient spring-like mid-section along at least a portion of the length of the finger between the first and second abutment sections to permit outward deformation of the inner edge of the finger upon disposal of a wire between the opposed spaced fingers adjacent the finger mid-sections,
wherein each finger includes at least one opening within the mid-section to provide the resilient spring-like mid-section.
9. The insulation displacement connector of claim 8 wherein a portion of the outer edge between the first and second abutment sections in inwardly recessed toward the inner edge such that each finger has a width that is narrower in the mid-section to provide a thinned resilient spring-like mid-section.
10. The insulation displacement connector of claim 8 wherein the fingers have smooth corners along the inner edges.
11. The insulation displacement connector of claim 8 where the inner edges of the opposed fingers are substantially planar along a wire contact area.
12. The insulation displacement connector of claim 8 wherein the inner edges of opposed fingers each include a scraper member adjacent an end of the respective finger distal from the base portion, the scraper members having inner edges spaced from one another by a distance slightly less than a diameter of a wire to be disposed between the fingers.
13. The insulation displacement connector of claim 8 wherein the first abutment sections includes an outwardly extending barb engaging the end walls of the slot to retain the insulation displacement terminal within the housing.
14. The insulation displacement terminal of claim 8 wherein the terminal receiving slot includes opposed second end walls adjacent the open end, the second end walls spaced by a second distance greater that the first distance and outboard of the first end walls, the housing including a ledge extending between the first end walls and the adjacent second end wall;
the base portion including flanges extending outwardly of the fingers, the flanges each including a surface that abuts one of the ledges within the housing to limit an insertion depth of the insulation displacement terminal within the housing.