Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/14—Bolts or the like for shooting into concrete constructions, metal walls or the like by means of detonation-operated nailing tools

Definitions

• the invention relates to a nail which can be processed with a bolt thruster with the features of the preamble of claim 1.
• Powder or gas operated pin thrusters for machine setting of nails in concrete and the like are well known. This method is very fast because it generally requires no pre-drilling, but nails are driven as fasteners directly into the ground.
• failure rate is often up to 80%, much more nails need to be set than would be necessary with only properly set nails.
• a nail for pin thrust devices is known with a conical tip region and a subsequent spherical transition region in which expands the cross-sectional area to a circular cross section of a shank region.
• the shaft area is followed by a head or a thread.
• the document proposes to provide a plurality of flats that reduce the circular cross-section of the body.
• the flats are evenly distributed over the circumference and slightly inclined to the longitudinal axis.
• the publication emphasizes that the flats are so close to each other that form edges between them, which cut into the material of the substrate.
• edges have the disadvantage that they form a notch in the ground in the finished state, which has a weakening, resulting in an increased risk of failure of the substrate result.
• such nails show the known, explained above leadership problem when setting with the result of a high failure rate.
• the invention is therefore based on the object to provide a nail for bolt thrust devices, which has an improved anchoring and a lower failure rate when setting.
• the nail according to the invention has a tip region, which is followed by a transition region. In the transition area, the cross-sectional area expands starting from the tip area. At the transition region, a shaft region with a constant cross-sectional area can join.
• the nail has a base body with a round, in particular circular cross-sectional area.
• the cross-sectional area may thus be, for example, oval or have the shape of a rounded polygon. In particular, in the case of forming production, however, the circular shape is to be preferred because of its simplicity.
• the round cross-sectional area is reduced in the transition region by flats running along the nail, i. The nail differs in this area from the round shape of the body.
• the flats do not have to extend over the entire transition area and they do not extend in particular to the top area.
• the flattening can also extend beyond the transition region into a shank region or the like.
• the flattened portions do not extend over the entire cross section and do not form any edges between them, but curved outwards, in particular partially circular, peripheral portions are provided between the flattenings over their entire length. These curved peripheral portions are in particular peripheral portions remaining from the main body, which are not affected by the reduction in cross-section of the flats.
• the nail according to the invention has the advantage that it combines a good grip with a good setting behavior. Due to the tip area, the nail is guided stably in its penetration path. In particular, on pebbles enclosed in the concrete, the tip area reacts more stably than, for example, with a tip area Flattening is expected because the pebble is more likely to penetrate from a top area with a round cross-sectional area. In flat peak areas, however, the surfaces promote a deflection of the nail. The same applies to an oblique penetration into the ground.
• flattening has the advantage that the wedge effect causes the thrust force to be very efficiently converted to displace the substrate, ie to create the receiving volume for the nail. In the transition region, therefore, they show a particularly advantageous effect.
• the nail over the entire length of outwardly curved, in particular part-circular peripheral portions or a completely round circumference is performed.
• the avoidance of edges between the flats also causes edges with a small included angle can be excluded and thus no sharp notches are introduced into the ground.
• a particularly balanced ratio of curved peripheral sections and flats with sufficient cross-sectional area reduction results in three flattenings, with good results even with four flattenings.
• a symmetrical structure with uniform and uniformly distributed over the circumference flats not only has the advantage of easier production compared to an asymmetric structure, but it is also a stable leadership behavior when penetrating the ground achieved.
• the flats may be arranged completely parallel to the longitudinal axis of the nail, but they are preferably slightly inclined, in particular inclined at about 4 degrees to the longitudinal axis. This results in the above-mentioned wedge effect in a particularly advantageous manner. However, good results are also achieved with angles between 2 and 5 degrees.
• the flats are preferably formed as flat surfaces, but they can also be formed, for example, concave or slightly convex.
• the surface may also be structured, that is, for example, have longitudinal grooves.
• the said effect of flattening should also be used for the displacement of the base material, which is why the tip area must not be too long.
• the tip region therefore preferably has a length which corresponds to 0.5 to 1, 0 times, in particular 0.7 to 0.8 times, the maximum diameter of the nail in the region of the flats. The length thus depends decisively on the cross-sectional area to be displaced in the transition region.
• the tip region has a point angle of 20 to 40 degrees, in particular 25 to 35 degrees. This achieves a good compromise between blunt, poorly penetrating tip area and too lean, unstable tip area.
• the transition region is crowned, i. the nail forms in longitudinal section a convex cut surface, for example, with a circular section as an outer contour, which refers in particular, but not necessarily only, to the peripheral portions between the flats. Compared with, for example, strictly conical contours, this allows a better penetration behavior.
• Figure 1 is a perspective view of the embodiment
• Figure 2 is a longitudinal section corresponding to the plane I of Figure 1;
• the nail 1 shown in the figures is suitable for driving by means of a bolt pushing device, not shown, in concrete or the like. It has a tip region 2 with a tip 3, wherein the tip 3 has a point angle S of 30 °.
• the short tip region 2 is adjoined by a longer transition region 4, in which the cross-sectional area A of the nail 1 widens continuously from the tip region 2 to a substantially cylindrical shaft region 10.
• Transition region 4 is designed crowned, that is, the outer contour forms in the longitudinal section shown in Figure 2 a circular section with a radius R.
• a head 5 in the form of a further, significant cross-sectional area enlargement connects.
• One of the tip 3 opposite end face 6 of the head 5 serves to transmit the driving forces of the thrust bolt of the bolt thruster on the nail 1.
• the nail 1 7 flats. These flats 7 reduce the actually circular cross-section A of the nail 1, as shown in FIG.
• the flats 7 are designed as planes which are arranged at an angle W of 4 degrees to the longitudinal axis of the nail 1.
• the total of three flats 7 are arranged symmetrically and uniformly distributed over the circumference. Partialcircumferential circumferential portions 9 of the main body 8 remain along the circumference of the respective cross-sectional area A over their entire length L.
• the tip region 2 extends over a length I 1 which, in relation to the largest diameter D of the cross-sectional area A in the region of the flattenings 7, results in a relative length of about 0.7. Substituting the length L, over which the flattening 7 extend, in relation to this diameter D, the result is a value of about 4.3.
• the radius R of the balling transition region 4 is chosen so that it corresponds approximately to 11 times the diameter D. A value between 8 and 16 for this ratio has proved to be particularly advantageous.
• the tip region 2 With its closed circular cross-section produces a good guide.
• the transition region 4 penetrates, on the one hand, the peripheral sections 9 ensure a good linear guide, and on the other hand provide the flats 7 for a wedge-like, efficient displacement of the corresponding volume.
• the setting is preferably carried out through a bore of a sheet, not shown, to be fastened or the like. Through, until the head 5 comes to rest on the outside of this attachment object.
• an annular body made of plastic or the like. Can be used to bridge different depths of insertion, as is known from the prior art.
• the design of the nail 1 ensures on the one hand a very straight and thus low-loss driving and on the other hand, that it hardly comes to notch effects in the finished state due to the obtuse angle between flats 7 and peripheral portions 9, so that in addition a firm grip is ensured.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Portable Nailing Machines And Staplers (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (1)

Citations (2)

• 2008
  • 2008-08-07 DE DE102008037001A patent/DE102008037001A1/de not_active Withdrawn
• 2009
  • 2009-07-29 EP EP09777508A patent/EP2307743A1/de not_active Withdrawn
  • 2009-07-29 WO PCT/EP2009/005480 patent/WO2010015349A1/de active Application Filing
  • 2009-07-29 TW TW98125514A patent/TW201007018A/zh unknown

Patent Citations (2)

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