FIELD: mechanics.
SUBSTANCE: screw for solid materials, e.g. concrete or stone-work, comprises a screw body, screw head, screw front edge and thread with cutting teeth. Aforesaid cutting teeth are in turns shifted L.H. and R.H. from imaginary center line. This side thread surface feature alternating ledges and recesses. Aforesaid thread features adjoining teeth shifted in turns sideways.
EFFECT: ease of manufacture, ease of screwing in and higher retaining strength.
12 cl, 5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DENTAL IMPLANT | 2003 |
|
RU2323698C2 |
| COUNTERSUNK SCREW | 2004 |
|
RU2314441C9 |
| THREAD-FORMING SCREW | 2005 |
|
RU2326273C1 |
| SCREW ELEMENT | 2014 |
|
RU2569769C9 |
| FASTENING UNIT AND PROSTHESIS HAVING THE UNIT | 1997 |
|
RU2189200C2 |
| SELF-TAPPING SCREW IMPLANT | 2011 |
|
RU2547726C2 |
| 0 |
|
SU333775A1 | |
| SELF-DRILLING SCREW | 2007 |
|
RU2443914C2 |
| SCREW FOR ENGAGEMENT WITH WOOD OR OTHER COMPOSITES | 2017 |
|
RU2744697C2 |
| SELF-CUTTING SCREW | 0 |
|
SU651721A3 |
