KR20050037425A - Drill assembly - Google Patents

Abstract

A drill assembly (1) comprising a cutter arrangement (50) and a guide member (2), the guide comprising a longitudinal axis (A-A), the arrangement of the assembly being such that, in use, the cutter arrangement engages with the guide and the cutter arrangement being caused to rotate about the longitudinal axis and the guide being shaped so as to pivot cutter blocks (51) of the cutter arrangement generally laterally of the longitudinal axis as the cutter arrangement is urged in a direction which is generally parallel to said longitudinal axis. In a preferred embodiment the guide is of a frusto- conical profile (6) so as to form a hole (20) of a corresponding shape. Advantageously the shape of the hole formed with the assembly can be accurately controlled. The inventive assembly finds particular application in reaming preformed holes which are used to locate anchor bolts.

Description

Drill assembly {DRILL ASSEMBLY}

The present invention relates to a drill assembly, in particular a drill assembly for forming holes suitable for receiving anchor bolts.

It is known to install anchor bolts used to reinforce a structure, such as a bridge, by a tie between a fixed anchor and the structure. Anchor bolts are also used in tunnel construction and in the mining industry and are used to secure the masonry fronts of buildings as high quality joint structure wall joining substitutes in bricks and masonry. In order to fix the anchor bolts, a hole in which bolts can be arranged must be formed with a filler such as gravel. Various methods for forming the holes are known but problems such as the weakness of the fixed strength caused by the holes and the formation of holes provided in a form that cannot be easily adjusted occur.

1 is a plan view of a cutter arrangement of a drill assembly in accordance with the present invention with one cutter limb in a fully extended position;

2 is an exploded view showing the guide member and the housing of the cutter arrangement of FIG.

3 is a partial exploded view of the cutter arrangement of FIG.

4 is a side view of FIG. 3;

5 is a perspective view showing a guide member constituting the second embodiment of the drill assembly of the present invention.

6 is a partially exploded perspective view showing the housing of the second embodiment;

7A-7F are perspective views showing 'snap-shots' of the progress of the second embodiment in use.

8 is an enlarged perspective view of a second embodiment in use;

9 is an exploded perspective view showing a third embodiment of a drill assembly of the present invention.

10A-10F are perspective views showing 'snap-shots' in a third embodiment in use.

11 is an enlarged perspective view of a third embodiment in use;

* Symbol description *

2: guide means 5: upper part

6: lower part 11: washer

51: figure 56: support portion

58: guide coupling portion 60: the first curved portion

61: second curved portion 62: third curved portion

It is an object of the present invention to provide an improved drill assembly.

According to a feature of the invention, it has a cutter means and a guide means, the guide means having a longitudinal axis, the cutter means is mounted for pivotal movement formed in the transverse direction of the longitudinal axis of the guide means around each pivot axis, With respect to a drill assembly in which the pivot axes are parallel to the longitudinal axis of the guiding means, in use the cutter means is connected with the guiding means, the cutter means rotating about the longitudinal axis of the guiding means and being parallel to the longitudinal axis. And a drill assembly having a moving component in a direction, the guide means being configured to move the cutter means in a transverse direction with respect to the longitudinal axis.

It is advantageous that the guide means are shaped into a target shape, and in use the holes of the shape can be accurately shaped by the guide means. According to a preferred embodiment of the present invention, the guide means is shaped such that the cutter means forms a hole of varying diameter, in particular a hole in the shape of a gap.

It is advantageous to have an elongated member positioned in the preformed hole configured in the guide means.

It is advantageous for the guide means to have a guide surface and to be connected with the guide surface in use so that the cutter means determines the lateral movement of the cutter means.

It is advantageous for the guide means to have a first truncated portion.

The guide means has a second truncated cone portion, and the direction in which the second truncated cone portion is reduced is opposite to the direction in which the first truncated cone portion is reduced.

A plurality of truncated cone portions that are reduced in a common direction are configured in the guide means.

A second truncated cone portion is provided towards the distal end of the guide means.

The cutter means is elastically deflected with respect to the guide means.

The cutter means consists of a plurality of cutters pivoted.

The plurality of cutters arranged around the guide means and mounted pivotally have significant cutter surface coverage.

The cutting surface of the cutter means is configured in an arc shape.

According to another feature of the invention, the guide means is inserted into the preformed hole, the guide means has a longitudinal axis and has a variable diameter portion, connecting the guide means and the cutter means, and the cutter means of the guide means. The method of forming a hole, characterized in that the cutter means is rotated about the longitudinal axis and has a motion component in a direction parallel to the longitudinal axis, and the cutter means is moved across the longitudinal axis around the pivot axis parallel to the longitudinal axis. Is provided.

According to another feature of the invention, a cutter means for connecting with the guide means is configured, the cutter means is rotated around the longitudinal axis of the guide means, combined with the outer surface of the guide means parallel to the longitudinal axis A drill cutter assembly is provided characterized in that the cutter means moves about a pivot axis about a longitudinal axis.

1, 2, 3 and 4 show a drill assembly in a running state consisting of a drill bit assembly with cutter means and a guide means. The guide means has an elongated guide member 2, the guide member having a longitudinal axis A-A and having an upper part 5 and a lower part 6.

The upper part 5 has a cylindrical shape and the lower part 6 has a truncated cone shape. A cone angle given to tan ^-1 (1/100) (known to provide a significant fixation function) is provided to the lower part 6.

The distal end of the guide member 2 located close to the upper side 5 has a circular washer 10, and the distal end of the guide member 2 located close to the lower side 6 has a circular washer 11. Have

The cutter means has a cutter array 50, and five cutter rims 51 mounted for the pivoting movement and spaced at the same angle are configured in the cutter array. The cutter array 50 is located at the distal end 55 of the cylindrical tubular housing 9. Opposite end portions 14 of the housing are connected with drive means (not shown in the figure). The outer diameter of the housing 9 may be provided from about 300 mm to 75 mm.

Each cutter rim 51 has an arc-shaped cutter face, and two cutter portions 57a, 57b made of a material of a suitable hardness such as diamond grains in a metal matrix and arc-shaped are formed on the cutter face. . Each cutter rim 51 has a support portion 56, a guide coupling portion 58, a first curved portion 60, a second curved portion 61 and a third curved portion 62.

Referring to FIGS. 3 and 4, cutter rims 51 are inserted and arranged between the lower plate 53 and the upper plate 64. The lower plate 53 is generally circular in shape and has five holes 65 and a central hole 66 spaced at the same angle. The top plate 64 fixed to the bottommost arranged portion 55 is circular in shape and has five holes 67 and a central hole 68 spaced at the same angle.

In the assembled state, five cap screws with heads 69 and pins 71 pass through aligned holes 65 and 67 and pivot holes 70 of each cutter rim 51. To pass.

The spring 72 is positioned by the respective cap screws, and the screw 72 has two arms 74 and 75. The arm 74 is arranged to be supported against the inner side 76 of the lower plate 53, and the arm 75 is arranged to be supported against the third curved portion 62 of each cutter rim 51.

The cutter arrangement 50 operates as follows. The guide member 2 is lowered into the preformed hole of a constant diameter until the washer 11 is arranged at the base of the preformed hole. Since the cutter array 50 rotates around the longitudinal axis of the guide member (by the housing 9 which rotates around the axis AA by the driving means), the guide connecting portion 58 of the cutter rim 51 It is connected with the guide member. When the cutter array gradually descends into the preformed hole, the lower part of the guide member 6 around the axis formed by each cap screw 69 to form a reamed hole 78. The rim pivots across the longitudinal axis. As the cutter rim 51 gradually moves outward in the transverse direction, different portions of the cutter portions 57a and 57b come into contact with the drilled material (of the preformed hole).

Thus, a truncated conical groove is formed.

The cutter surfaces 35b ', 35c' and 35d 'of each cutter block wear out gradually during use and are eventually exposed to new cutting surfaces during the wear process until no cutting material remains and the cutter block is replaced.

Referring to Figures 5, 6, 7, 8, a second embodiment of the invention consisting of a cylindrical housing 80 and a guide member 81 is shown.

The guide member 81 has a cylindrical upper portion 83 and a truncated lower portion 84. A spider 85 consisting of three rims is configured on the upper portion 83. The spider 85 is configured at the uppermost distal end of the upper part 83 and is fixed in place by two nuts 86 at each side of the spider 85. The other spider 85 is constructed towards the bottommost end of the upper portion 83 and fixed in place by two flanking nuts 86.

At the lowermost distal end of the lower part a cylindrical shaft 87 is provided. The washer 89 is attached to the distal end of the shaft 87 by the nut 88.

The housing 80 is tubular and has a cutter arrangement at the distal end of the housing. The cutter arrangement has three cutter rims 90 and each rim has a suitably hardened portion 91, which portion provides a cutter face with arc contours.

On each of the pins 92 the cutter rims 90 are pivotally mounted (through the holes 90a of each cutter rim 90), and around the center hole 93 the pins of the housing 80 are pivotally mounted. It extends toward the outside.

A hole 93 is formed by the inner surface portion 94 so that the outline of the hole is the same as that of each spider 85.

The plate 95 and the nuts 96 are actuated to hold the cutter rim in place on the housing 80. The plate 95 has a through hole 97 so that the through hole receives each pin 92 and for each nut 96 a portion of each pin protruding through the hole 97 is attached to the pin. Can be used.

The plate 95 has three extensions 98 extending outwards, which extensions are arranged circumferentially between the through holes 97. With the extension, the extensions can instead wear out before the nuts 96 wear out.

The outer diameter of the housing 80 has a size of about 100mm to 20mm.

In use, the drill assembly operates as follows. The guide member 81 is first positioned inside the housing 80, so that the thermal coupling surface 99 of each cutter rim comes into contact with the upper portion 83 (as shown in FIG. 7A) and the cutter rim is completely in place. Are arranged in. The longitudinal axis BB of the guiding member 81 remains in agreement with the longitudinal axis (not shown) of the housing, and when the assembly is lowered into the preformed hole (as described below). The support 100 of the spider 85 contacts the inner surface of the housing 80 such that a frictional connection is formed such that the housing and the guide member are sufficiently axially spaced apart. However, the support portion 100 has a friction characteristic, so that a relative sliding movement between the support portion and the inner surface of the housing 80 is possible during the drilling operation.

The assembly is lowered into the hole until the washer 89 is arranged at the base of the preformed hole 101. In this state, the inlet of the preformed hole and the cutter surfaces are located in close proximity. The housing 80 is then rotated about the axis B-B of the guide member 81 and pressed downward. 7B, 7C, 7D and 7E, when the connecting portion 99 of each cutter rim 90 contacts the lower portion 84 of the guiding member 81, the cutter rims gradually move outwards. The truncated hole 102 is formed during movement and movement. See enlarged view of FIG. 8.

When a continuous downward movement of the housing 80 occurs, the connecting portions 99 of the cutter rim 90 pass through the lower end of the lowering portion 84 and pass through the shaft 87, where the cutter rims are in full home position. By forming a state, the assembly can be easily removed from the aperture.

A third embodiment of the present invention is shown in Figs. 9, 10 and 11. The drill assembly shown in the figures has a housing 110 and a guide member 111.

The housing 110 has a cylindrical tubular shape and has two cutter features 120 at the bottom end. Each cutter configuration 120 is comprised of a shaft 121 having a cam follower 123 at the distal end facing the positioning head 122 at one distal end. The cam follower 123 has an end face portion 124 for receiving the partial circle portion 125, and the partial circle portion is made of a hardening material to form a cutter surface.

11, the cam follower 123 also constitutes a nip 126 located on the side of the recesses 127 and 128.

Each positioning head 122 is received by each through hole 129 and a shank portion (not shown in the figure), the shank portion is fitted into the positioning head and the shaft 121, and each through hole 129 The positioning head 122 is accommodated in the semicircular groove 130 provided in proximity to).

The housing 110 further has two opposite longitudinal slots 131 which open at the distal end of the housing 110 and receive each axis 121.

The outer diameter of the housing 110 has a size of about 32 mm to 12 mm.

The guide member 111 is described with four elongated channels 112,113 (only two of the channels are shown in FIG. 9 and the remaining channels are the same two channels as the channels 112,113). Four channels are spaced circumferentially about the longitudinal axis C-C of the guide member.

The channels 113 have arcuate cross-sectional contours to accommodate the axes of the respective cutter configurations 120.

The channels 112 are v shaped and have three surfaces 112a, 112b, 112c and receive the nip 126 of the cam follower 123.

Viewed in cross section, the surfaces 12b and 112c at the upper end of the guide member 111 constitute a surface 112a forming two inclined side walls and a 'basal' surface. When the surface 112a extends along the guide member 111 downward toward the basal portion 137, the surface 112a is described as a flat 'rising' slope. In describing the progressively downward axial position, the surface 112a is gradually extended outward of the axis C-C. In addition, the surface 112A is 'twisted' to the outside of the guide member 111 by the gradually downward position, that is, the direction perpendicular to the axially spaced portion of the surface 112a is downward along the guide member 111. Rotated by position.

The radial height of the surface 112c is reduced by the downward axial position.

Surface 112b is essentially curved so that nip 126 allows sufficient spacing by progressive downward motion. (Best seen in FIG. 9).

The intermediate surface 135 spaces the groove 136 longitudinally from each channel 112.

The lowermost end of the guide member 111 constitutes the basal portion 137, which has a truncated cone shape and has a nip 138.

When the guide member and the housing are lowered into the preformed hole (by referring to FIG. 10A) by the frictional connection between the means and the guide member located inside the housing, the guide member until it reaches the base of the hole. And a pair of opposing holes 132 in the housing 110 for positioning the means to keep the housing axially spaced apart to prevent the guide member from falling off by its own weight.

In use, the drill assembly operates as follows. 10A and 10B, the housing 110 and the guide member 111 are lowered into the preformed hole 140. The housing 10 and the guide member 111 are rotated to both sides around the axis C-C and at the same time the housing is pressed downward.

As the housing 110 gradually moves downward, the shafts 121 move along the channel 113, and the pivoting movement of the cutter occurs by the connection between the surface 112A and the nip 126, which pivot The motion is formed in the transverse direction of the axis CC.

When the cam follower 123 reaches the end of the channel 112, the channels 112 are positioned close to the intermediate surface 135 and the nips 126 are moved into the recess 136 by downward motion. Pressed on the (135), and forms a state in which the partially circular cutter portion 125 is completely in place.

10C, 10D, 10E, and 10F, a truncated conical hole 141 is formed.

Unlike the embodiments of FIGS. 1 to 4, the embodiments of FIGS. 5 to 8 and 9 to 11 do not require springs or elastic means to bias the cutter into the longitudinal axis of each guide member. This means that in the latter embodiments, when each housing is rotated about the longitudinal axis of the guide member, a portion of the cutter of hardened material has a moment around each pivot axis, and the rotational movement of the housing leverages the cutter against the guide member. Because It is not necessary for springs or other resilient members to be configured inside the cutter array, thereby significantly reducing the overall size of the assembly. However, the embodiment of FIGS. 1 to 4 in which the cutter rims 51 are configured has an inward levering action to some extent in addition to the load applied to each by each spring.

Although the guide member of the above embodiments has a truncated conical structure, the guide member of the present invention can be configured to be bent outwardly to form a 'bell shape' to generate lateral movement of the cutter means during use.

A plurality of conical truncated contiguously located in the same direction is constructed in the guide member.

Claims (16)

The cutter means has a cutter means 51 and a guide means 2, the guide means having a longitudinal axis AA, and the cutter means for a pivotal movement formed in the transverse direction of the longitudinal axis of the guide means around each pivot axis. A drill assembly mounted, wherein the pivot axes are parallel to the longitudinal axis of the guide means. In use, the cutter means is connected to the guide means, the cutter means rotates about the longitudinal axis of the guide means and has a motion component in a direction parallel to the longitudinal axis, the cutter means moving transversely to the longitudinal axis. Drill assembly, characterized in that the guide means are configured to. Drill assembly according to claim 1, characterized in that the guiding means (2) are located in the preformed hole and consist of an elongated member. 3. Drill assembly according to claim 1 or 2, characterized in that the cutting means is connected with the guide surface to determine the lateral movement of the cutter means when the guide means (2) have a guide surface. 4. Drill assembly according to claim 1, 2 or 3, characterized in that the guide means (2) have a first truncated portion (6). 5. Drill assembly according to claim 4, characterized in that the guiding means (2) have a second truncated cone portion and the direction in which the second truncated cone portion is reduced is opposite to the direction in which the first truncated cone portion is reduced. Drill assembly according to claim 5, characterized in that a second conical portion is provided towards the distal end of the guiding means (2). Drill assembly according to one of the preceding claims, characterized in that the cutter means (51) is elastically deflected with respect to the guide means (2). Drill assembly according to one of the preceding claims, characterized in that the cutter means (51) consists of a plurality of cutters pivoting. Drill assembly according to one of the preceding claims, characterized in that the cutter means (51) has an arcuate cutter surface (57a, 57b). Drill assembly according to one of the preceding claims, characterized in that a cutter surface (57a, 57b) composed of diamond grains in a metal matrix is formed in the cutter means (51). The guide means (2) of claim 1, characterized in that the positioning means (113) for receiving the pivot portion (121) of the cutter means (120) is constituted by the positioning means in the longitudinal axis of the guide means. And the cutter means move in a direction parallel to and the cutter means pivot. 12. Drill assembly according to claim 11, wherein the positioning means has a longitudinal channel (113). The cutter means (51) according to one of the preceding claims, wherein the cutter means (51) has an arrangement of pivotally mounted cutters, wherein the surface portions (58) constructed in the cutter means and located radially inwardly are arranged with the guide means (2). Drill assembly, characterized in that arranged to be connected, wherein the guide means (2) is located in the center of the cutter arrangement. Inserting the guide means 2 into the preformed hole, the guide means 2 has a longitudinal diameter (A-A) and a variable diameter portion, Connect the guide means and the cutter means 51, The cutter means rotates about the longitudinal axis of the guide means and has a motion component in a direction parallel to the longitudinal axis, wherein the cutter means moves across the longitudinal axis around the pivot axis parallel to the longitudinal axis. Method of molding the hole to be made. 15. A method according to claim 14, characterized in that the cutter means (50) and the guide means (2) rotate in rotation about the longitudinal axis. Cutter means 51 is configured to be connected to the guide means 2, the cutter means rotates around the longitudinal axis AA of the guide means, and is coupled with the outer surface of the guide means to be parallel to the longitudinal axis. Drill cutter assembly (50), characterized in that the cutter means moves across a longitudinal axis about a pivot axis.