SI9010279A - Drill - Google Patents

Abstract

It has a drill bit in plaster on the stem drills arranged depth limiter (10), comprising an elastic damping element (4, 20). Head (5) drill bit (1) extends laterally to the stem, standing laterally blades (6, 7). The drill bit (1) spans on the stem at a distance overhead (5) bulge (8), at offset above bulge (8) and the depth limiter (10). It encompasses an elastic annular damping element (4) resting on the bearing plate (3) which is mounted between the damping element (4) and stem-based collars (2).

Description

The invention relates to a drill according to the introductory part of the main patent claim.

A drill bit with a depth stop arranged on the stem of the drill bit is used to make the holes, the depth of which should be accurate. A molded collar can be used as a depth limiter, which, when working with the drill, can cause damage in the area of the mouth of the bore when touched by the wall surface. Preferably, drill bits whose drilling head comprises laterally mounted lateral blades are used for the production of holes with the undercut based on the bore. These drills can be clamped into the drilling machine and used for drilling and undercutting. The depth stop protruding on the drill stem limits the penetration depth of the drill bit. A collar mounted on the stem can serve as a depth limiter, which, when touched with the surface of the wall, strikes the bottom and damages the bore opening. In particular, care must be taken to ensure that, during the twisting process required to smooth the undercutting of the borehole, the depth limiter rests on the surface of the plaster wall, which can damage the surface of the wall with a rigid depth limiter.

It is an object of the invention to create a drill whose depth stop will not cause damage in the hole opening area.

The solution to this problem is given by the characteristics given in the main claim. By providing a depth limiter with an elastic damping element, it avoids damage to the wall surface in the hole opening area, which can occur with a rigid depth limiter.

21066PR0.IV

A preferred embodiment of the drill according to the invention is that the depth limiter comprises an elastic annular damping element, preferably consisting of polyurethane or a suitable plastic material. When mounting the depth limiter on the wall surface, the damping element is effective between the wall surface and the drill collar drilled on the stem, and the resulting blows from the drilling machine. In addition, the damping element has sufficient elasticity to deepen the depth limiter, especially during the twisting motion of the drill bit, in the manufacture of a trimmed bore that fully rests against the wall surface. In the case of a twisting motion, the damping element deforms accordingly alternately, but in this case the position on the surface of the wall of the adjacent contact surface of the depth limiter remains unchanged. The damping element not only has the advantage that the surface of the wall is not damaged, but also that the smoothing of the undercut keeps the optimum alignment of the depth limiter on the wall surface.

There is a bearing plate between the damping element and the drill-shaped stem of the drill bit, which significantly reduces the friction between the rotating collar and the damping element, which does not rotate together with the damping element. The bearing plate can be designed as a metal plate or it may consist of plastic material with good sliding properties.

The damping element can be secured against the axial movement on the stem by a drill-shaped collar surrounding the housing surrounding the drill stem. In this case, the housing may also be completely surrounded by the damping element or gripping on the cylindrical side of the damping element, so that the lower area of the damping element, which represents the contact surface of the depth guide, is freely moved in the direction of the drilling head. The aforementioned embodiment comprises a soft support surface as in the case of a non-enclosing housing, thereby making the surface of the wall particularly beautiful.

A further embodiment of the invention provides that the depth limiter comprises an elastic, earthen damping element which extends on its side through a drill-shaped collar on the stem and has a bottom with a through hole through which a drill stem extends from the collar to the drill head. The damping element can be easily drilled through the stem

21066PR0.IV Push the drill bit against the collar over the head, moving the collar surrounding the side of the damping element over the collar with some pressure. The damping element may also be one-piece made of elastic plastic material, e.g. polyurethane.

In order to reduce or reduce. to prevent friction between the collar and the bottom of the damping element, a bearing plate disposed between the collar and the bottom within the space enclosed by the damping element may be affixed to the drill stem.

The invention will now be further illustrated by means of the drawings, in which FIG. 1 shows a first embodiment of a drill with a damping element; FIG. 2 is a further embodiment with a damping element enclosing the housing, FIG. 3 shows a further partially illustrated embodiment of a drill with a side housing on a damping housing, and FIG. 4 is a further embodiment of a depth limiter drill designed as an elastic crucible.

In FIG. 1, the drill 1 presented has a collar 2 formed on the stem, supported by a bearing plate 3. A damping element 4 is arranged below the latter, which is designed as an elastic plastic plate.

The drill bit 1 comprises a head 5 with laterally projecting lateral blades 6, 7, which in a manner known per se are used to make a cut based on the bore. The stem comprises a protuberance 8 which defines a pivot point within the bore when smoothing the undercut. The drill bit 1 rests with the widest part 9 of the projection 8 on the wall of the bore, whereby it can be swung laterally about this pivot point.

The collar 2, the bearing plate 3 and the damping element 4 together form a depth stop 10 defining the maximum depth of the drill bit 1 into the plaster. As soon as the damping element 4 with its contact surface 11 is applied to the surface 12 of the plaster wall 13, the drill bit 1, which is engaged in the non-shown drilling machine, can start laterally twisting to smooth the undercut 14 into the axis 3

21O66PR0.IV new bore. By twisting motion, the collar 2 tends to alternate alternately to the side, leaving the damping element 4 slightly elastically deformed. With its contact surface 11, it attaches the damping element 4 completely to the surface 12 of the wall.

In FIG. 2 shows a drill bit 1 comprising a depth stop 10 consisting of a collar 2, a bearing plate 3, a damping element 4 and a housing 15 enclosing a damping element 4 and a collar 2. The housing 15 has an upper through hole 16 and a lower through hole 17, and is generally versatile closed.

In FIG. 3 comprises a depth stop 10, also a housing 18 whose lower edge 19 is curved inwards, and a side grip on the cylindrical side wall of the damping element

The bearing plate 3 is a metal plate, and the plastic plate with good sliding properties can also be used.

As a depth limiter, 10 volumes of FIG. 4 shows a drill bit 1 an elastic, earthen damping element 20 and a drilled collar 21 formed on the stem of the drill bit. There is a bearing plate 23 in the intermediate space between the bottom 22 of the damping element 20 and the collar 21, which may consist of metal or plastic with good sliding properties. The damping element 20 is made of elastic plastic material in one piece, designed as a section of a cone.

The damping element 20 has, through the bottom 22, a through hole 24 through which the stem of the drill 1 with grooves 25 and the drill head 26 protrude downwards. Page 27 narrows upwards, as does the circumferential surface of the collar 21. The conical circumferential surface of the collar 21 has the same inclination as the conical one the inner surface of the side 27 of the damping element 20.

The presented drill bit 1 can be clamped into the unpowered drilling machine or the like with the top of its stem. Impacts transmitted from the drilling machine to the stem of the drill bit 1 are sufficiently suffocated when the damping element 20 is applied to the wall surface, so as to reliably avoid damage to the wall surface in the mouth area of the bore.

Claims (9)

Patent claims A drill bit for producing holes in a plaster with a drill bit arranged with a depth stop, characterized in that the depth stop (10) comprises an elastic damping element (4, 20). Drill according to claim 1, characterized in that the head (5) of the drill bit (1) comprises side-mounted side blades (6, 7) side-by-side, that the drill bit (1) comprises a bulge (5) on the stem at a distance above the head (5). 8) or similar, and at a distance above the bulge (8), a depth limiter (10) comprising an elastic annular damping element (4) resting on a bearing plate (3) which is mounted between the damping element (4) and on the stem designed collar (2). Drill according to claim 1 or 2, characterized in that a collar (2) surrounding the housing (15,18) is connected to the damping element (4). Drill according to claim 3, characterized in that the housing (15) is surrounded by a damping element (4) and a collar (2). Drill according to claim 3, characterized in that the housing (18) is gripped laterally on the damping element (4) so that the lower, in the direction of the head (5), projection portion of the damping element (4) protrudes freely from the housing (18). A drill according to claim 1, characterized in that the depth stop (10) comprises an elastic, earthen damping element (20), which with its side (27) encloses a stem-shaped collar (21) and has a bottom (22) through it. an opening (24) through which the drill stem (1) extends from the collar (21) to the head (26). Drill according to claim 6, characterized in that the damping element (20) is designed as a section of a cone. Drill according to claim 6 or 7, characterized in that the inner walls of the damping element (20) and the shape of the collar (21) have a conical circumferential surface. 21066PRO IV Drill according to claim 8, characterized in that the bearing plate (23) is mounted between the bottom (22) of the damping element (20) and the collar (21).