ITTN20120003A1 - STATIC TIP FOR ROTOPERCUSSION DRILLS - Google Patents

Description

DESCRIPTION OF THE INDUSTRIAL INVENTION

Description of the industrial invention entitled:

â € œstatic tip for rotary percussion drillsâ €

1. State of the art:

In order to carry out small building works of ordinary and / or extraordinary maintenance, and in particular for demolition at home or hobby level, you can count on manual equipment (hammers and bits) or on drills for drilling, both with simple rotation or roto-percussion.

The latter constitute aids only for drilling operations on small diameters (max 10-12mm) and for hole depths limited to about 150-200mm in not particularly hard materials.

But, always and in any case the rotary percussion drills transmit a rotary movement to the tools (the work tips, with different shapes and cutting edges depending on the material on which they have to work).

2. Inherent and related technical problems:

The rotary movement imparted by the drill spindle to the tips (aka â € œdrill bitsâ €) makes impossible any and all work in which the tool itself does not have to rotate, such as in chiselling operations.

The chiselling operation, with the terminal part of the tool (machining tip) stationary and non-rotating, is instead possible with specialized equipment such as â € œdemolersâ € or â € œthackersâ €.

However, these tools (`` breakers '' or `` hammers '') are characterized by costs much higher than those of simple rotary percussion drills (for family or hobby use), for which they are purchased and used only and exclusively by construction companies or plant engineering.

3. Solution of the technical problem:

The problem mentioned above has been overcome with the design of a new static tip for rotary percussion drills which absorbs the rotary movement of the drill spindle and instead maintains the percussion action of the drill on the tool (the tip).

In this way the working tip is released from the rotation of the spindle, thus allowing the use of chisel tools of different sizes or simple conical or pyramidal tips.

4. Description of one or more forms of implementation:

In principle, solutions other than the one conceived cannot be implemented except for the size of the diameter of the tip to be fixed on the spindle of the rotary percussion drills or for the shape of the work tip which can be different, such as:

- conical

- pyramidal

- chisel with cutting edge of different sizes, linear or toothed.

5. Operation:

The rotating stem of the static drill bit for rotary percussion drills is normally inserted into the drill chuck and locked to it by the jaws, as is done with normal bits on the market.

The tip, in the different forms in which it can be forged (see previous point 4., description of one or more embodiments) having the possibility to rotate independently from the movement of the spindle, can be kept still by the operator by means of an appropriate handle, so it becomes, in effect, â € œstaticâ € with respect to the rotation movement of the spindle itself.

6. Description of the attached drawing:

1 drawing is attached to the present industrial invention which represents the longitudinal section of the conical or pyramidal and chisel type tips.

With reference to the graph above, the static drill bits can be made in the following components:

1 static work tip which can be:

a- conical tip

b- pyramidal tip

c- chisel tip of different cutting edge sizes

2. shank of the tip

3. bearing rings

4. rear closing cap

5. rotating shaft (connected to the chuck of the rotary percussion drill)

7. Advantages:

The new system conceived allows the creation of a rotary percussion drill structure - static tip, with the following advantages compared to the current situation mentioned above:

1 ° with the static tip, kept in position by the operator, it is possible to carry out small chiselling operations also with common rotary percussion drills, widespread all over the world;

2, the existing rotary percussion drills can be used without any modification since the bearing-rings make the detachment between the mechanical rotation movement of the spindle and the shank in a static position;

3 ° the coupling of the rotary percussion drill - static tips indicated in the previous paragraph 4., transforms the assembly into a chiselling system, or a small demolition system (such as a small hammer drill or a specific demolition machine).

8. Variants:

Conceptually, no variations can be made to the system devised and described above.

In practice, it is believed that variations can be made to what has been conceived and described above, however, resulting in the consequent problems:

1. the stem (2) - rear cap (4) connection could be made, as well as with a threaded coupling, as designed, also by hot or cold forcing of the two parts into each other.

Problem: in this way, however, the possibility of disassembling the assembly is jeopardized to carry out ordinary maintenance operations (lubrication of the bearing-rings to reduce rotating friction) and extraordinary maintenance operations (replacement of one or more parts, such as the shank-tip due to work wear or the bearing-rings).

2. the number of bearing-rings (3) could be reduced compared to what was conceived, and in particular in the area near the rear closing cap, as they are subject to less work effort.

Problem: in this case, however, an imbalance of the tool is determined during the work phase, especially in the forcing phase of the tool itself as a wedge with the application of strong lateral thrusts or perpendicular to the axis of the same tool.

Claims (1)

CLAIMS 1. the â € œstatic tip for rotary percussion drillsâ € characterized by an axial bearing-shaped structure that absorbs the rotary movement of the drill spindle and maintains the percussion action on the working tip of the tool; 2 . the â € œstatic tip for rotary percussion drillsâ €, as per the previous claim (l), is characterized by a simple and sturdy construction made up of 3 pieces (n ° 2, n ° 4, n ° 5 of the drawing) as well as to the bearing-rings (No. 3 in the drawing); 3. the `` static tip for rotary percussion drills '', as per the previous claim (l), is characterized by the threaded connection between the shank of the tip (n ° 2 of the drawing) and the rear closing cap (n ° 4 of the drawing ), quick and easy, to allow disassembly and ordinary maintenance (lubrication of rotating parts) and extraordinary maintenance (replacement of one or more parts due to wear); 4. the â € œstatic tip for rotary percussion drillsâ €, as in the previous claim (l), is characterized by the possibility of building the individual parts with different materials, in particular the shank-tip built in hard steel on the surface (tempered or tempered or stainless steel) to ensure a long wear resistance of the working tip (the tip, n ° l in the drawing) or the bronze bearing rings (n ° 3 in the drawing) for the best axial rotation movement of the rotating rod ( n ° 5 in the drawing) and the shank-tip (n ° 2-1 in the drawing).