DISPOSITION INTRODUCED IN DRILLING TOOLS FOR GEOTECHNICAL SURVEYING

Description

1 / 5 A new arrangement introduced in drilling tools for geotechnical investigation. TECHNICAL FIELD

[001] This utility model relates to an arrangement introduced in drilling tools for geotechnical soil investigation, said tools notably presenting innovative constructive characteristics, given that they provide a hollow auger equipped with a rotation limiting key and an internal radial cutout for locking the locks of a removable drilling head, which allows the removal of the head after drilling, keeping the auger installed in the ground and ensuring the stability of the borehole walls. The said head is made up of parts with specific dimensions, designed to fit the said auger model. HISTORY OF THE TECHNIQUE

[002] In the geotechnical surveying sector, the precision, speed, and safety of drilling processes are fundamental for obtaining representative subsurface samples and for the success of subsequent technical analyses. Traditionally, the drilling tools used in soil surveying consist of hollow augers, drill heads, drill bits, and locking mechanisms, whose constructive configuration directly influences the efficiency of the operation and the safety of the operators.

[003] Among the available solutions, the simple auger drilling process stands out, in which an auger consisting of helical rods is used which, when joined, form a continuous tube. At the lower end is located the cutting crown, responsible for penetration into the soil. During the operation, the assembly is driven into the ground and subjected to rotation by means of a drilling rig. The external propellers promote the transport of the disaggregated soil to the surface, ensuring the cleanliness and relative stability of the borehole. The advance continues to the specified depth so that, upon reaching the desired level, the auger is removed to allow the introduction of samplers, such as the split spoon used in SPT tests or even undisturbed soil samplers. Petition 870250095813, dated 10 / 20 / 2025, p. 5 / 28 2 / 5

[004] However, removing the auger after drilling can compromise the integrity of the borehole walls, causing instability or even collapse. This situation implies a loss of time and, often, the need to restart the drilling process.

[005] In order to mitigate these inconveniences, hollow auger models were developed, as exemplified in patent no. PI 1003499-4, owned by the Applicant, which describes an adaptation of a diamond drilling tool assembly in drilling equipment, characterized by the dimensional modification of the drilling crown. The internal diameter was increased from 63.5 mm to 67.2 mm, while preserving the external diameter at 95.7 mm. This alteration resulted in a thinner cutting blade, allowing for higher rotation speed, efficiency in rock cutting, and maintenance of the hole diameter at 95.9 mm, in addition to allowing the extraction of a larger volume of core.

[006] Another document found is US20120073877A1, which presents a hand drill composed of a working head, shaft and handle with ratchet, intended for manual soil drilling. Although it proposes a manual drive mechanism with ratchet, the solution does not include removable movable head systems, nor locks that facilitate the quick disassembly of the assembly without removing the auger from the hole.

[007] Thus, it is a fact that the documents cited in the paragraphs above, despite belonging to the same field of application, do not present any of the characteristics of the tooling now improved, thus ensuring that it meets the legal requirements for patentability. FUNCTIONAL IMPROVEMENTS

[008] The main functional improvement of the tooling consists of the provision of a limiting key for rotation and internal radial cutout for locking the locks of a removable drilling head, as well as the new dimensioning of the multifaceted arrival ring, the stop ring, the lower locking body, the drill base and the tricone drill, which have been adjusted for corresponding fit in the innovated auger. Advantages Obtained

[009] One of the advantages of the present utility model consists in presenting a Petition 870250095813, dated 10 / 20 / 2025, page 6 / 28 3 / 5 drilling tooling for geotechnical surveying that allows the removal of the movable drill head without the need to remove the hollow auger from the hole, optimizing operating time and reducing the physical effort of the operators.

[010] Another relevant advantage is offering an improved locking mechanism, in which the locking tabs are held open by the action of a spring, ensuring greater safety and precision during the fitting and locking of the head.

[011] The utility model also aims to limit the movement of the movable head within the hollow auger by means of a multifaceted arrival ring with adjustable dimensions, in addition to providing a robust and practical coupling of the tricone drill bit to the auger base, with dimensions compatible with the hollow auger used. DESCRIPTION OF THE FIGURES

[012] To complement the present description in order to obtain a better understanding of the characteristics of the utility model and in accordance with a preferred practical embodiment thereof, a set of drawings is attached to the description, where, in an exemplary, though not limiting, manner, the following is represented:

[013] Figure 1 represents an exploded perspective view of the parts of the drilling tooling;

[014] Figure 2 shows a perspective and cross-sectional view of the hollow auger to illustrate the radial cutout and rotation limiting key of the locks;

[015] Figure 3 represents a perspective view of the arrival ring;

[016] Figure 4 shows a perspective view of the stop ring;

[017] Figure 5 illustrates a perspective view of the lower additional latch;

[018] Figure 6 represents a perspective view of the base of the tricone drill bit;

[019] Figure 7 shows a perspective view of the tricone drill bit;

[020] Figure 8 shows an assembled perspective view of the tooling;

[021] Figure 9 illustrates a longitudinal cross-sectional view of the assembled tooling and with an enlarged detail of the contact point of the locking tabs with the radial cutout of the auger;

[022] Figure 10A shows the longitudinal cross-section of the tooling with a movable head. Petition 870250095813, dated 10 / 20 / 2025, page 7 / 28 Ms installed inside the auger; and

[023] Figure 10B shows the same longitudinal section with the movable head being removed and the spring being compressed to disengage the locks and extract the head. DETAILED DESCRIPTION OF THE OBJECT

[024] With reference to the illustrated drawings, the present utility model relates to an ARRANGEMENT INTRODUCED IN DRILLING TOOLING FOR GEOTECHNICAL SURVEYING, more precisely it is a drilling tool (10) for geotechnical surveying comprising a hollow auger (11) which has an axial channel (11A) through which the movable head (12) is inserted, formed by a harpoon (12A) for anchoring the overshot of the head extraction tool (12), connected to a base (12B) fixed by screw (Pl), to a retractable locking box (12C), which has a pair of oblong and parallel slots (12cl) for the passage of the tabs (12dl) of the locks (12D).One end of the tabs (12dl) are connected to each other by a through shaft (el) and oppositely each tab (12dl) receives a connecting rod (12E), both joined by an opposite shaft (e2) sliding longitudinally in the slot (12fl) made in a complementary lock (12F) inserted inside the retractable lock box (12C), which also receives an end washer (12c2) for contact with the base (12B), which serves as a stop for the complementary lock (12F) when the head (12) is disengaged.

[025] Parallel to the slot (12fl) made in the body of the upper supplementary lock (12F) there is an external diametrical reduction (12f2), for mounting a helical spring (12G), which keeps the tabs (12d1) of the lock (12B) open.

[026] The lower end of the supplementary locking body (12F) is accommodated in the nozzle of an additional lower lock (12H), whose opening receives the arrival ring (121) and this receives the stop ring (12J). The opposite end of the additional lower lock (12H) accommodates the extension (12kl) of the base (12K), which provides at the opposite end a cradle (12k2) that receives the threaded shaft (1211) of the tricone drill (12L).

[027] According to the present utility model, said axial channel (11A) of the auger (11) receives a movable head (12) locked inside the channel (11A) by means of the tabs Petition 870250095813, dated 10 / 20 / 2025, page 8 / 28 5 / 5 (12dl) of the set of articulated locks (12D) anchored in the radial cut (llal) made on the inner face (lla2) and close to the median portion of the channel (11A), the inner face (lla2) of the auger (11) having one or more keys (11C) limiting the rotation of the head (12), as well as having a multifaceted arrival ring (121), a stop ring (12J), an additional lower lock (12H), a base (12K) and a tricone drill (12L) with dimensions (DM) adjusted for accommodation in the axial channel (11A) and comprising: - Multifaceted arrival ring (121) with a diameter (Dl) equivalent to 1,006 mm and a thickness (El) of 169 mm; - stop ring (12J) with diameter (D2) of 1.062 mm and diametral reduction (12jl) with diameter (D3) of 1.015 mm; - Lower additional lock (12H) with an outer diameter (D4) of 169 mm and a length (C4) of 1,252 mm; - Base (12K) with an outer diameter (D5) of 950 mm and a length (C5) of 1,068 mm; and - tricone drill bit (12L) with a shaft (1211) with a diameter (D6) equivalent to 447 mm and a length (C6) of 1,726 mm.

[028] The tooling (10) operates as follows: initially, the movable head (12) is inserted into the hollow auger (11), with the tabs (12dl) of the locks (12D) held open by the action of the spring (12G). The displacement of the head (12) is limited by the arrival ring (12L), which prevents excessive advance and ensures precise positioning.

[029] After positioning, the locks (12D) are activated, promoting the secure locking of the head (12) to the auger (11). To remove the head, simply attach the overshot to the harpoon (12A) which pulls the entire head (12), causing the spring (12G) to compress and consequently the flaps (12dl) to retract.

[030] The preferred embodiment of the present utility model has been described, and any modifications and / or alterations should be understood as being within the scope of the utility model presented. Petition 870250095813, dated 10 / 20 / 2025, page 9 / 28

Claims

1 / 2 CLAIM 1. ARRANGEMENT INTRODUCED IN DRILLING TOOLS FOR GEOTECHNICAL SURVEYING, more precisely it is a drilling tool (10) for geotechnical surveying comprising a hollow auger (11) which has an axial channel (11A) through which the movable head (12) formed by a harpoon (12A) is inserted, connected to a base (12B) fixed by a screw (Pl), to a retractable locking box (12C), which has a pair of oblong and parallel slots (12cl) for the overlap of the tabs (12dl) of the locks (12D);One end of the tabs (12dl) are connected to each other by a through shaft (el) and oppositely each tab (12d 1) receives a connecting rod (12E), both joined by an opposite shaft (e2) sliding longitudinally in the slot (12fl) made in a complementary lock (12F) inserted inside the retractable lock box (12C), in which it also receives an end washer (12c2) for contact with the base (12B), in which it serves as a stop for the complementary lock (12F) when the head (12) is disengaged; parallel to the slot (12fl) made in the body of the upper complementary lock (12F) there is an external diametrical reduction (12f2), for mounting a helical spring (12G), which keeps the tabs (12dl) of the lock (12B) open; the lower end of the supplementary locking body (12F) is accommodated in the nozzle of an additional lower lock (12H), whose opening receives the arrival ring (121) and this receives the stop ring (12J);the opposite end of the lower additional lock (12H) accommodates the extension (12kl) of the base (12K), which provides at the opposite end a cradle (12k2) that receives the threaded shaft (1211) of the tricone drill bit (12L); characterized by an axial channel (11A) of the auger (11) receiving a movable head (12) locked inside the channel (11A) by means of the tabs (12dl) of the articulated locking assembly (12D) anchored in the radial cutout (llal) made on the inner face (lla2) and near the median portion of the channel (11A), the inner face (Ha2) of the auger (11) having one or more keys (11C) limiting the rotation of the head (12), as well as having a multifaceted arrival ring (121), a stop ring (12J), an additional lower lock (12H), a base (12K) and a tricone drill bit (12L) with dimensions (DM) compatible for accommodation in the axial channel (11A), the dimensions (DM) of the multifaceted arrival ring (121) being comprised of a diameter (Dl) equivalent to 1006 mm and Petition 870250095813, dated 10 / 20 / 2025, page 10 / 28; 2 / 2 thickness (El) of 169 mm; (ii) stop ring (12J) with diameter (D2) of 1062 mm and diametral reduction (12jl) of diameter (D3) of 1015 mm; (iii) lower additional lock (12H) with outer diameter (D4) of 169 mm and length (C4) of 1252 mm; (iv) base (12K) with outer diameter (D5) of 950 mm and length (C5) of 1068 mm; and (v) tricone drill (12L) with shaft (1211) with diameter (D6) equivalent to 447 mm and length (C6) of 1726 mm. Petition 870250095813, dated 20 / 10 / 2025, page 11 / 28

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