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A threaded rod hanger has quick lock plunger mechanism that includes plunger pieces within a tapered bore in a housing. The plunger pieces have tapered outer surfaces. A spring within the housing presses the plunger pieces toward the narrow end of the bore, with the spring located between the plunge

A threaded rod hanger has quick lock plunger mechanism that includes plunger pieces within a tapered bore in a housing. The plunger pieces have tapered outer surfaces. A spring within the housing presses the plunger pieces toward the narrow end of the bore, with the spring located between the plunger pieces and a back plate that closes off part of a wide end of the tapered bore. The plunger pieces have internally threaded surfaces that engage threads on a threaded rod that is inserted into the bore, between the plunger pieces. Once the threaded rod has been inserted between the plunger pieces and released, the plunger pieces are pushed toward the narrow bore end. This causes the plunger pieces to press inward, automatically causing the internal plunger half threads to engage the external threads on the threaded rod.

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1. A threaded rod hanger comprising: a housing having a tapered bore therein, wherein the tapered bore has a wide end and a narrow end; anda threaded rod locking mechanism, wherein the threaded rod locking mechanism includes: plunger pieces movable within the tapered bore, wherein the plunger pieces

1. A threaded rod hanger comprising: a housing having a tapered bore therein, wherein the tapered bore has a wide end and a narrow end; anda threaded rod locking mechanism, wherein the threaded rod locking mechanism includes: plunger pieces movable within the tapered bore, wherein the plunger pieces have sloped outer surfaces that engage the bore, and threaded inner surfaces; anda spring within the tapered bore providing a spring force biasing the plunger pieces toward the narrow end of the tapered bore;wherein contact between the outer surfaces of the plunger pieces and a bore surface at the narrow end of the tapered bore drives the plunger pieces toward one another and toward an axis of the tapered bore;wherein the spring is a coil spring;wherein one end of the coil spring is in contact with the plunger pieces;wherein the coil spring has a shoulder coil at the one end of the spring that is smaller than other coils of the spring; andwherein the shoulder coil is in contact with the plunger pieces. 2. A threaded rod hanger comprising: a housing having a tapered bore therein, wherein the tapered bore has a wide end and a narrow end; anda threaded rod locking mechanism, wherein the threaded rod locking mechanism includes: plunger pieces movable within the tapered bore, wherein the plunger pieces have sloped outer surfaces that engage the bore, and threaded inner surfaces; anda spring within the tapered bore providing a spring force biasing the plunger pieces toward the narrow end of the tapered bore;wherein contact between the outer surfaces of the plunger pieces and a bore surface at the narrow end of the tapered bore drives the plunger pieces toward one another and toward an axis of the tapered bore;wherein the spring is a coil spring;wherein one end of the coil spring is in contact with the plunger pieces; andwherein the threaded inner surfaces cooperate to produce a threaded receptacle for receiving external threads of a threaded rod only when the plunger pieces are not in contact with each other. 3. A threaded rod hanger comprising: a housing having a tapered bore therein, wherein the tapered bore has a wide end and a narrow end; anda threaded rod locking mechanism, wherein the threaded rod locking mechanism includes: plunger pieces movable within the tapered bore, wherein the plunger pieces have sloped outer surfaces that engage the bore, and threaded inner surfaces; anda spring within the tapered bore providing a spring force biasing the plunger pieces toward the narrow end of the tapered bore;wherein contact between the outer surfaces of the plunger pieces and a bore surface at the narrow end of the tapered bore drives the plunger pieces toward one another and toward an axis of the tapered bore;wherein the spring is a coil spring;wherein one end of the coil spring is in contact with the plunger pieces; andwherein the threaded rod hanger further comprises a structure attachment mechanically coupled to the housing, for attaching the threaded rod hanger to building structure. 4. The threaded rod hanger of claim 3, wherein the plunger pieces are substantially semiannular. 5. The threaded rod hanger of claim 3, wherein the outer surface of the plunger pieces has a keyed connection with the bore. 6. The threaded rod hanger of claim 5, wherein the keyed connection includes the plunger pieces or the bore having key holes therein. 7. The threaded rod hanger of claim 3, wherein the plunger pieces define an opening between them, whereby the opening is capable of receiving a threaded rod. 8. The threaded rod hanger of claim 7, wherein the plunger pieces have chamfers on them;wherein the chamfers are sloped so as to urge the threaded rod into the opening between the plunger pieces; andwherein chamfers face the narrow end of the tapered bore. 9. The threaded rod hanger of claim 3, further comprising a back plate that is at the wide end of the tapered bore. 10. The threaded rod hanger of claim 9, wherein the back plate is press fit, seated, threaded, or coupled into the wide end of the tapered bore. 11. The threaded rod hanger of claim 9, wherein the other end of the coil spring is in contact with the back plate. 12. The threaded rod hanger of claim 3, wherein the housing includes an insert which has the tapered bore in it; andfurther comprising another part of the housing into which the insert is inserted and to which the insert is coupled. 13. The threaded rod hanger of claim 12, wherein one end of the spring is in contact with the another part of the housing. 14. The threaded rod hanger of claim 3, wherein one end of the spring is in contact with the housing. 15. The threaded rod hanger of claim 3, further comprising a set screw threaded into a threaded hole in the housing;wherein the set screw engages at least one of the plunger pieces to prevent uplift of the plunger pieces within the bore. 16. The threaded rod hanger of claim 3, wherein the threaded rod hanger is a beam clamp. 17. The threaded rod hanger of claim 3, wherein the threaded rod hanger is an anchor bolt. 18. The threaded rod hanger of claim 3, wherein the threaded rod hanger is a strut nut. 19. The threaded rod hanger of claim 3, in combination with a threaded rod having external threads threadedly engaged with the threaded inner surfaces of the plunger pieces. 20. A threaded rod hanger comprising: a housing having a tapered bore therein, wherein the tapered bore has a wide end and a narrow end; anda threaded rod locking mechanism, wherein the threaded rod locking mechanism includes: plunger pieces movable within the tapered bore, wherein the plunger pieces have sloped outer surfaces that engage the bore, and threaded inner surfaces; anda spring within the tapered bore providing a spring force biasing the plunger pieces toward the narrow end of the tapered bore;wherein contact between the outer surfaces of the plunger pieces and a bore surface at the narrow end of the tapered bore drives the plunger pieces toward one another and toward an axis of the tapered bore;wherein the spring is a coil spring; andwherein the coil spring has a shoulder coil at one end of the spring that is smaller than other coils of the spring. 21. The threaded rod hanger of claim 20, wherein the shoulder coil is in contact with the plunger pieces. 22. The threaded rod hanger of claim 3, wherein the shoulder coil is in contact with a washer that is between the coil spring and the plunger pieces. 23. A threaded rod hanger comprising: a housing having a tapered bore therein, wherein the tapered bore has a wide end and a narrow end;a threaded rod locking mechanism, wherein the threaded rod locking mechanism includes: plunger pieces movable within the tapered bore, wherein the plunger pieces have sloped outer surfaces that engage the bore, and threaded inner surfaces; anda spring within the tapered bore providing a spring force biasing the plunger pieces toward the narrow end of the tapered bore; anda structure attachment mechanically coupled to the housing, for attaching the threaded rod hanger to building structure;wherein contact between the outer surfaces of the plunger pieces and a bore surface at the narrow end of the tapered bore drives the plunger pieces toward one another and toward an axis of the tapered bore. 24. The threaded rod hanger of claim 23, wherein the threaded rod hanger is a beam clamp. 25. The threaded rod hanger of claim 23, wherein the threaded rod hanger is an anchor bolt. 26. The threaded rod hanger of claim 23 wherein the threaded rod hanger is a strut nut. 27. The threaded rod hanger of claim 23, wherein the structure attachment includes a pair of legs extending from the housing, for receiving a part therebetween. 28. The threaded rod hanger of claim 27, wherein the legs and the housing are parts of a single monolithic piece of material. 29. The threaded rod hanger of claim 27, wherein at least one of the legs has a threaded hole therein. 30. The threaded rod hanger of claim 27, wherein the legs have respective threaded holes therein. 31. The threaded rod hanger of claim 27 further comprising a bolt threaded into a threaded hole in one of the legs, for clamping a flange or other part against the other of the legs.