CS239000B1 - Unit-contruction twist drill for stricking drilling - Google Patents

Abstract

Modular twist drill for hammer drilling is intended for drilling holes in building materials, rocks and alike. It is detachably assembled from individual the functional parts they are blade, carrier bar, clamping shank and discharge spiral, secured in working positioning ring. Length the drill bit can be changed by extending the carrier rods by at least one part and in exchange longer spirals. Stavebnicový the twist drill can also be used for rotary drills drilling without impact.

Description

(54)

Modular twist drill bit for impact drilling

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(51) Int Cl?

B28D 1/14, E21B 10/36

Modular spiral drill bit for hammer drilling is designed for drilling holes in building materials, rocks and the like. It is detachably assembled from individual functional parts, which are the cutting crown, the support rod, the clamping shank and the spiral, secured in the working position by a safety ring. The length of the drill bit can be changed by extending the support rod by at least one part and replacing the spiral extension with a longer one. The modular twist drill can also be used for rotary drilling without hammering.

239 000

- 1,239 noo

Modular twist drill for hammer drilling is designed for drilling through or blind holes in building materials, rocks and the like.

When drilling deep through or blind holes in brick, stone or combined masonry, cinder concrete, plain or reinforced cement concrete, stone and the like with drilling electro-pneumatic hammers, we use imported drills made of one piece of material, with clamping shanks characteristic for each manufacturer so they are unmistakable. Their cost is high and their service life is determined mainly by the quality of the carbide tip, in which the whole drill is no longer usable. Abroad, some types of drill bits are provided with a replaceable or interleaved blade that can be removed from the crown bed, inverted or rotated, and reinserted into a bed in which the blade is secured, for example, by a pin. The drills produced by us are made of one piece of material and are intended for smaller drilling depths only. The need for long drills, however, continues to increase in proportion to the number of renovated and refurbished buildings and especially historical buildings whose masonry is insulated by chemical infusion.

These shortcomings are eliminated by a modular spiral drill bit for drilling holes in building materials, rocks and the like, on which a carrying spiral is inserted, the front part of which is inserted into the longitudinal groove of the cutting crown, optionally equipped with a replaceable or positive edge. The invention is based on the fact that the support rod is detachably connected to the front end

239 000 cutting crown and rear end with clamping shank, the discharge spiral is secured to the support rod by a locking ring. According to a second feature, the support rod is also detachably assembled from at least two longitudinal members.

The main advantage of the modular twist drill is that it can be disassembled into individual functional parts so that if any of them is damaged, the other parts can be reused without losing the valuable and expensive material they are made of. It is possible to use a cutting crown of any diameter, the spiral inserted on the support rod, can have any profile corresponding to the diameter of the crown, but also different pitches or other detailed form suitable for each type of drilled material. The support rod can be detachably assembled from two or more longitudinal parts, allowing the drill to be extended and drilled to a greater depth. The shank may be conical, hexagonal, threaded, or may have grooves and the like, depending on the type of drilling machine for which it is intended. Alternatively, a uniform shank can be used and different drilling machines can be supplemented with an appropriate reduction. The modular drill can also be rotated without hammering ·

The attached drawing shows a schematic view of a modular twist drill.

An example of a particular embodiment of a spiral rack according to the invention is the use of a drill bit, in that slightly oblique blind holes of 30 mm diameter were drilled to a depth of 100 cm up to a depth of 100 cm to insulate by chemical infusion. A universal electro-pneumatic hammer equipped with a modular spiral drill bit for hammer drilling was used for drilling. First, a drill bit was assembled. A 600 mm long support rod 5 was screwed into the cutting crown 1 provided with the longitudinal groove 2, onto which a 30 mm profile spiral 4 was inserted, the front part 3 of which was inserted into the longitudinal groove 2 of the cutting crown 1. The corresponding drill shank 6 was then screwed into its rear end, and the assembled drill bit was then clamped into an electro-pneumatic hammer. After drilling the hole to a depth of 50 cm, the drill bit was extended by an additional 600 mm so that after removal from the electro-pneumatic hammer,

239 000 of the shank 6, the securing ring 7 and the discharge spiral 4 removed, and another support rod 5 of the same length of 600 mm was screwed into the support rod 5, so that the total length of the support rod 5 was then 1200 mm. Another extension spiral 4 of greater length was then slid onto it, the front part 3 of which was inserted again into the longitudinal groove 2 of the crown 1. The extension spiral 4 was secured in its working position by a locking ring 7, also pushed onto the extended support rod 5, the corresponding end shank 6 was then screwed to the corresponding shank 6. With such an extended drill, the holes were drilled to the prescribed depth.

Modular twist drill can also be used for rotary drilling without hammering ·

Claims (2)

SUBJECT OF THE INVENTION 1. A modular spiral drill bit for drilling a hole in building materials, rocks and the like, onto which a carrying spiral is inserted, the front part of which is inserted into the longitudinal groove of the insert, optionally provided with a replaceable or interleaved blade, the support rod (5) is detachably connected at the front end to the cutting crown (1) and at the rear end to the clamping shank (6), the discharge spiral (4) being secured to the support rod (5) by a locking ring (7). A modular twist drill according to claim 1, characterized in that its support rod (5) is detachably assembled from at least two longitudinal parts.