Shaped anchor
An anchor for masonry. The anchor is relatively smooth walled and is forcibly driven into a hole formed in masonry or other suitable material for purposes of attaching fixtures. When driven into the hole, a shaped portion of the anchor is deformed in such a manner as to facilitate a 360 degree or greater bearing surface with the holes of wall. The walls of the hole impose forces onto the shank along this bearing surface which tend to deform shank into alignment with the hole by primarily elastic deformation so that the resulting frictional forces between the shank and the wall resist dislodgment from the hole.
1. A resilient anchor insertable into a preformed masonry hole having walls, the combination anchor and hole comprising:
an anchor shank having a smooth surface and including a circular upper end with adjoining straight upper shank section defining a nominal shank diameter, an opposite circular lower end with adjoining straight lower shank section, and a single asymmetric three-dimensional bulge disposed between the upper and lower straight sections of the shank and having a preinsertion length, the upper and lower ends defining a longitudinal axis passing through the ends, the upper and lower straight sections concentrically aligned with the longitudinal axis prior to inserting the anchor into the hole;
wherein after the anchor is inserted into the hole, the bulge and at least part of the upper or lower straight shank section adjacent the bulge move into engagement with the walls of the hole creating uninterrupted contact between the surface of the anchor and the hole walls along a continuum of longitudinal positions that is greater in length than the preinsertion length of the bulge alone.
2. The anchor of claim 1 , wherein at least part of both the upper and lower straight shank sections contact the walls of the hole.
3. The anchor of claim 1 , wherein the shank does not substantially abrade the walls of the hole when driven therein.
4. The anchor of claim 1 , wherein the bulge defines a first bend in a first plane and second and third bends each in a second plane that is oriented about 90 degrees to the first plane.
5. The anchor of claim 4 , wherein the first bend is radially offset from the longitudinal axis by a distance greater than the second or third bends.
6. The anchor of claim 5 , wherein the anchor is made of stainless steel or carbon steel.
7. The anchor of claim 1 , wherein the anchor includes a head attached to the upper end for driving the anchor into the hole.
8. The anchor of claim 7 , wherein the head has a diameter larger than the upper end.
9. The anchor of claim 1 , wherein the shank is hollow.
10. A resilient anchor insertable into a preformed masonry hole having walls, the combination anchor and hole comprising:
an anchor shank having a smooth surface and including a circular upper end with adjoining straight upper shank section defining a nominal shank diameter, an opposite circular lower end with adjoining straight lower shank section, and a single asymmetric three-dimensional bulge disposed between the upper and lower straight sections of the shank, the upper and lower ends defining a longitudinal axis passing through the ends, the upper and lower straight sections concentrically aligned with the longitudinal axis prior to inserting the anchor into the hole;
wherein after the anchor is inserted into the hole, the bulge and at least part of the upper or lower straight shank section adjacent the bulge move into engagement with the walls of the hole creating uninterrupted contact between the surface of the anchor and the hole walls along a continuum of longitudinal positions.
11. The anchor of claim 10 , wherein at least part of both the upper and lower straight shank sections contact the walls of the hole.
12. The anchor of claim 10 , wherein the shank does not substantially abrade the walls of the hole when driven therein.
13. The anchor of claim 10 , wherein the bulge defines a first bend in a first plane and second and third bends each in a second plane that is oriented about 90 degrees to the first plane.
14. The anchor of claim 13 , wherein the first bend is radially offset from the longitudinal axis by a distance greater than the second or third bends.
15. The anchor of claim 10 , wherein the anchor includes an enlarged head attached to the upper end for driving the anchor into the hole.
16. A resilient anchor insertable into a preformed masonry hole having walls, the combination anchor and hole comprising:
an anchor shank having a smooth surface and including a circular upper end with adjoining straight upper shank section defining a nominal shank diameter, an opposite circular lower end with adjoining straight lower shank section, and a single asymmetric three-dimensional bulge disposed between the upper and lower straight sections of the shank, the upper and lower ends defining a longitudinal axis passing through the ends, the upper and lower straight sections concentrically aligned with the longitudinal axis prior to inserting the anchor into the hole;
wherein after the anchor is inserted into the hole, the bulge and at least part of the upper or lower straight shank section adjacent the bulge move into engagement with the walls of the hole and creates greater than 360 degree uninterrupted circumferential contact between the surface of the anchor and the walls of the hole.
17. The anchor of claim 16 , wherein at least part of both the upper and lower straight shank sections contact the holes of the wall.
18. The anchor of claim 16 , wherein the shank does not substantially abrade the walls of the hole when driven therein.
19. The anchor of claim 16 , wherein the bulge defines a first bend in a first plane and second and third bends each in a second plane that is oriented about 90 degrees to the first plane.