Coil pin threaded fastener and duvet pin

1. An apparatus for securing a duvet cover to a duvet, comprising:

a first body;

a pin extending from the first body, said pin comprising at least part of a coil having elasticity;

a longitudinally extending second body comprising a proximal end and a distal end; and

a protrusion protruding sidewise from said second body between said proximal end and said distal end for engaging the at least part of a coil whereby the first and second body may be releasably secured together by a threading motion.

2. The apparatus of claim 1 , wherein the second body comprises:

a base;

an extension extending from the base, said extension having a proximal portion adjacent to the base and a distal portion away from the base; and

wherein the protrusion protrudes sideways from the extension for engaging the pin so that the protrusion forces the pin to translate forward when the pin is rotated in a threading motion; and

wherein at least part of the the protrusion is disposed between the proximal portion and distal portion.

3. The apparatus of claim 2 wherein the sideways protrusion consists of screw threads.

4. The apparatus of claim 2 , wherein:

the distal portion of the second body is configured to receive said at least part of a coil with a radial clearance fit; and

another portion of the second body is configured to receive said at least part of a coil with a radial interference fit.

5. The apparatus of claim 2 , wherein:

the second body tapers in width for at least a part of its length so that the distal portion is sized to have a radial clearance fit with said at least part of a coil, and at least part of the second body is sized to have a radial interference fit with said at least part of a coil.

6. The apparatus of claim 2 wherein the second body further comprises a walled enclosure around the extension.

7. The apparatus of claim 2 wherein the protrusion comprises a slanted surface.

8. The apparatus of claim 7 wherein the slanted surface extends at least partly around the second body.

9. The apparatus of claim 8 wherein the slanted surface comprises a helical surface extending at least partly around the second body.

10. The apparatus of claim 7 , wherein a pitch of the slanted surface is different than a pitch of said at least part of a coil so as to cause an interference fit between the slanted surface and said at least part of a coil in an axial direction.

11. The apparatus of claim 7 , wherein a pitch of the slanted surface is greater than a pitch of said at least part of a coil so as to cause an interference fit between the slanted surface and said at least part of a coil in an axial direction.

12. The apparatus of claim 7 , wherein a pitch of the slanted surface is less than a pitch of said at least part of a coil so as to cause an interference fit between the slanted surface and said at least part of a coil in an axial direction.

13. The apparatus of claim 1 , wherein the second body comprises:

an opening for receiving the pin, said opening defined by at least one internally facing side;

wherein the protrusion protrudes sideways from the at least one internally facing side, said protrusion for engaging the pin so that the protrusion forces the pin to translate forward when the pin is rotated in a threading motion.

14. The apparatus of claim 13 , wherein the protrusion consists of internal threads.

15. A fastening apparatus, comprising:

a first part comprising a coil having elasticity, said coil having a coil axis and an interior space along the axis;

a second part comprising a longitudinally extending body and external threads disposed around the body;

wherein the first part and second part are releasably connectable together by threading them together so that the coil meshes with the threads and so that the body is disposed in said interior space of the coil.

16. The fastening apparatus of claim 15 wherein a pitch of the coil is different than a pitch of the threads.

17. The fastening apparatus of claim 15 wherein a pitch of the coil is less than a pitch of the threads.

18. The fastening apparatus of claim 15 wherein a pitch of the coil is greater than a pitch of the threads.

19. The fastening apparatus of claim 15 wherein at least a portion of the longitudinally extending body is configured to receive said coil with a radial interference fit.

20. The fastening apparatus of claim 15 wherein the second part further comprises a walled enclosure around the external threads.

21. A fastening apparatus, comprising:

a first part comprising a coil;

a second part comprising an opening for receiving the coil, said opening defined by at least one internally facing side; and

internal threads protruding from said internally facing side;

wherein the first part and second part are releasably connectable together by threading them together so that the coil meshes with the threads.

22. A fastening apparatus, comprising:

a first body;

a pin extending from the first body, said pin comprising at least part of a coil;

a second body comprising a head with a penetrable material extending therefrom configured to receive the pin into but not through the body, so as to form a releasable mechanical connection with the pin upon insertion of the pin into the penetrable material.

23. A method of connecting a first and second object through a layer of material, comprising:

providing a first object comprising a coiled pin;

providing a second object comprising screw threads selected from a group consisting of external threads and internal threads;

positioning the first object proximate to a first side of the layer of material;

positioning the second object proximate to a second side of the layer of material in alignment across the layer with the first object;

moving at least one of the pin and layer so that the end of the pin advances into the layer; and

turning at least one of the first part and second part in a screwing motion so that the pin meshes with the threads so as to form a threaded connection.

24. The method of claim 23 wherein:

the step of positioning the first object proximate to a first side of the layer of material comprises positioning the first object proximate to an opening through the first side of a layer;

the step of moving at least one of the pin and layer comprises moving at least one of the pin and layer so that the end of the pin advances through the opening.