DE102017126726B4 - Holder device and stud body of an earth auger - Google Patents

Abstract

A holder device (100) for releasably attaching a stud body (120) for cutting soil into the lower end face of a hollow cylindrical wall of an earth auger, with an essentially U-shaped holder (110), the two of which are connected via a connecting web (111 ) interconnected legs (112, 113) in the area of the mutually opposing inner surfaces (114, 115) are provided with a guide groove (116, 116 ') for receiving a centering web (121, 121') of a stud body (120), characterized that an anchoring pin (118) is provided in the area of the inner surface (117) of the connecting web (111), which is provided with a bore (119) for the insertion of a locking pin (130) with which an exchangeable stud body (120) can be detachably attached which can be anchored to the holder (110) and in the area of the mutually opposing inner surfaces (114, 115) of the two legs (112, 113) of the holder (110) provided guide grooves (116, 116 ') are formed standing at an acute angle to each other, the stud body (120) having two mutually parallel side surfaces (141, 142) and adjoining each two front surfaces (143, 144).

Description

The invention relates to a holder device to be inserted into the lower end face of a hollow cylindrical wall of an earth auger for releasably fixed attachment of a stud body for cutting soil, with an essentially U-shaped holder, the two legs of which are connected to one another via a connecting web in the area of the opposite inner surfaces are each provided with a guide groove for receiving a centering web of a stud body.

As a rule, the soil is conveyed out of the earth auger through an upper opening of the earth auger after a cutting operation by means of a rotating element arranged inside the earth auger.

Holder devices of the type mentioned at the outset are used in the prior art in conjunction with stud bodies provided with cutting elements in order to drill holes in the ground by means of a plurality of the ground at constant intervals in the region of a lower end face of a hollow cylindrical wall around a central longitudinal axis rotatable earth drill attached stud body is pierced and the resulting earth is conveyed by means of a rotary element, for example, designed as a spiral screw through the hollow cylindrical earth auger and then out of an upper opening of the earth auger out of the earth auger.

During operation of the earth auger, depending on the hardness of the soil, sooner or later wear of the cutting elements of the stud body is inevitable, so that the stud body must be removed from the relevant holder devices after a given abrasion of the cutting elements and replaced with new stud body.

The known holder devices and stud bodies, however, have the disadvantage that a releasably fixed connection to a stud body can only be carried out in a time-consuming manner and that a holder device including stud body is complex and therefore expensive to manufacture.

The publication US 3,999,619 A discloses a device with a core tube having an elongated hollow cylinder with a substantially uniform diameter over its entire length and with a predetermined wall thickness and a device which is attached next to one end of the cylinder for attaching the core cylinder to a Kelly, further comprising A plurality of tooth receiving notches are provided, which are arranged at spaced apart points around the circumference of the cylinder at the end opposite the Kelly securing device, each of the notches having a substantially rectangular shape and being characterized by opposite edges which are at a predetermined distance are arranged from each other.

In this device, a plurality of core cylinder teeth are provided, each of which is mounted in one of the tooth receiving notches, each of the core cylinder teeth comprising a tooth body which has opposite, substantially parallel end faces which are arranged at the same predetermined distance from one another as the predetermined distance between the opposite edges of the tooth receiving notches of the core cylinder cylinder and which can be brought into engagement with the opposite edges of one of the notches, wherein also opposite, spaced apart, substantially parallel side surfaces are provided, each of which extends continuously along the entire length of the core cylinder tooth, the distance between the opposite end faces of the tooth body is dimensioned at least as large as the distance between the opposite side faces thereof, and wherein each of the core cylinder teeth further s is provided with crotches extending from the tooth body along the inner and outer surfaces of the core cylinder.

Furthermore, from the publication EP 1 223 302 A2 a cutting tooth arrangement for an earth-working machine with a cutting tooth, which has a tooth head and a tooth shaft and is provided with a holder with an insertion opening into which the tooth shaft can be inserted in an insertion direction, the tooth shaft being inserted in the holder by means of a crosswise to the holder Fastening pin arranged releasably and the bracket is fork-shaped with two holding arms, the holding arms each having a contact side, which abut the narrow sides of the tooth shaft, and wherein the contact sides and the narrow sides are provided with a profile transverse to the direction of insertion to form a positive connection , and on the contact side of at least one holding arm and on the associated narrow side of the toothed shaft, a recess is provided, which together form a passage for the fastening pin in the inserted position.

The object of the invention is to provide a holder device for a releasably fixed connection with a stud body, which can be produced in the casting process without any mechanical rework and thus inexpensively and a faster compared to the known holder devices Exchanging a relevant stud body, which can also be produced in the casting process, with a robust fit of a stud body in the holder device, is permitted.

For a device of the type mentioned above, this object is achieved according to the invention in that an anchoring pin is provided in the area of the inner surface of the connecting web, which is provided with a bore for inserting a securing pin, with which an exchangeable stud body can be detachably firmly anchored to the holder, and the guide grooves provided in the area of the mutually opposing inner surfaces of the two legs of the holder are formed at an acute angle to one another, the stud body having two mutually parallel side surfaces and adjacent thereto two front surfaces arranged at a predetermined angle to one another.

Preferred embodiments of the invention are the subject of the dependent claims of the respective independent patent claims, the elements of which act in the sense of a further improvement of the solution approach of the object on which the invention is based.

In the holder device according to the invention, by means of the combination of features of the characterizing part of patent claim 1 in conjunction with the features of the preamble, it is achieved that a holder can be produced inexpensively in the casting process, in which a releasably fixed connection with a stud body for a quick replacement of a worn one Stollen body is comparatively time-consuming to carry out.

Furthermore, the stud body provided in connection with the holder device according to the invention is distinguished by the fact that in the prior art existing weak points that regularly occur in the area of two mutually opposing bores are avoided.

According to a first preferred embodiment of the device according to the invention, it is provided that the holder legs are provided with a flat end face in the region of an end remote from the connecting web.

The outer surfaces of the legs are preferably but not necessarily arranged parallel to one another, the end faces of the legs being arranged at right angles to the outer surfaces of the legs.

According to an important preferred embodiment of the device according to the invention, the stud body is provided in the region of a lower end with a single anchoring pocket for releasably firmly encircling the anchoring pin of the holder, the anchoring pocket preferably being formed by two projections which are opposite one another at a predetermined distance and each have a bore are provided for receiving a locking pin which is also guided through the bore of the anchoring pin.

The two front surfaces arranged at a predetermined angle to one another are preferably provided with a centering web designed as a projection, which is provided for cooperation with a respective guide groove of the holder.

The two centering webs of the two opposing front surfaces are arranged at an acute angle to one another, which corresponds to the angle at which the two opposing guide grooves formed on the respective legs of the holder are arranged.

The respective front surfaces of the stud body are preferably but not necessarily divided into two partial surfaces at an obtuse angle to one another.

According to a further preferred embodiment of the device according to the invention, the stud body is provided in the region of its side faces with a plurality of cutting elements designed as respective projections.

In the area of an upper end of a cutting body, a stud body is preferably provided with two mutually opposing, outwardly obliquely arranged cutting edges, two adjacent cutting surfaces being provided at a predetermined angle to a respective cutting edge.

The two cutting surfaces, which are connected to each other via a cutting edge, can be arranged at an obtuse angle to one another.

According to a further preferred embodiment of the device according to the invention, the cutting body is likewise provided with a plurality of as in the region of its side surfaces adjoining the side surfaces of the stud body respective projections formed cutting elements.

In particular, however, the surface of the cutting body is also provided with a plurality of cutting elements designed as respective projections.

According to another important preferred embodiment of the holder device according to the invention, the cutting body forms a structural unit which is separate from the stud body and which can be detachably fixedly connected to the stud body.

The cutting body preferably has a basic cutting body and a connecting body firmly connected thereto for releasably attaching the basic cutting body to the stud body.

The connecting body can preferably be provided with a bore, by means of which the connecting body can be releasably anchored in a corresponding recess in the stud body in cooperation with a locking pin.

According to a further important embodiment of the holder device according to the invention, a securing pin is provided in the area of at least one of its end faces with a plurality of slots parallel to the longitudinal axis, by means of which an irreversible increase in the diameter of the relevant end of the securing pin is made possible by external application of a corresponding expansive force.

The holder is preferably introduced into the wall of an earth drill by welding the holder into the wall of the earth drill.

Furthermore, soil to be extracted is conveyed out of the earth auger by means of a rotation element arranged inside the earth auger through an upper opening of the earth auger, the rotation element generally being formed by a spiral screw.

• 1 den Halter der in 1 dargestellten erfindungsgemäßen Halter-Vorrichtung in einer Seitenansicht;
• 2 den Halter den in 1 dargestellten Halter in einer Ansicht von unten;
• 3 den in 1 dargestellten Halter in einer Teil-/Querschnittsansicht;
• 4 den in 1 dargestellten Halter in einer Ansicht von schräg oben;
• 5 den Stollenkörper der in 1 dargestellten Halter-Vorrichtung in einer Seitenansicht;
• 6 en in 5 dargestellten Stollenkörper in einer Teil-/Querschnittsansicht;
• 7 den in 5 dargestellten Stollenkörper einer Ansicht von oben;
• 8 eine bevorzugte Ausführungsform der erfindungsgemäßen Haltervorrichtung in einer Seitenansicht;
• 9 ein von einem Stollenkörper getrennter Schneidkörper in einer Querschnittsansicht;
• 10 den Schneidkörper des in 9 dargestellten Stollenkörpers in einer Seitenansicht;
• 11 den in 10 dargestellten Schneidkörper in einer Ansicht von schräg oben;
• 12 ein Sicherungsstift in einer Seitenansicht;
• 13 den in 12 dargestellten Sicherungsstift in einer Ansicht von schräg oben.

The holder device according to the invention is explained below with reference to a preferred embodiment which is shown in the figures of the drawings. In it show:

• 1 the holder of the in 1 illustrated holder device according to the invention in a side view;
• 2 the holder the in 1 illustrated holder in a view from below;
• 3 the in 1 illustrated holder in a partial / cross-sectional view;
• 4 the in 1 illustrated holder in an oblique view from above;
• 5 the stud body of the in 1 illustrated holder device in a side view;
• 6 en in 5 illustrated stud body in a partial / cross-sectional view;
• 7 the in 5 illustrated stud body a view from above;
• 8th a preferred embodiment of the holder device according to the invention in a side view;
• 9 a cutting body separated from a stud body in a cross-sectional view;
• 10 the cutting body of the in 9 illustrated stud body in a side view;
• 11 the in 10 illustrated cutting body in an oblique view from above;
• 12 a locking pin in a side view;
• 13 the in 12 illustrated locking pin in an oblique view from above.

The in the 1 to 3 shown holder device according to the invention 100 is intended for insertion into a lower end face of a hollow cylindrical wall of an earth auger and for releasably attaching a stud body 120 designed for cutting soil and contains a substantially U-shaped holder 110 two of which are connected by a connecting bridge 111 interconnected legs 112 . 113 in the area of the opposing inner surfaces 114 . 115 with a guide groove 116 . 116 ' to accommodate a centering bar 121 . 121 ' of a tunnel body 120 are provided.

In the area of the inner surface 117 of the connecting bridge 111 is a single anchor pin 118 trained the one with a bore 119 for inserting a locking pin 130 is provided with an interchangeable stud body 120 releasably attached to the holder 110 can be anchored.

The thigh 112 . 113 of the holder 110 are in the area of a connecting bridge 111 far end with a flat face 112 ' . 113 ' provided, and the outer surfaces 112 ' . 113 ' the thigh 112 . 113 are arranged parallel to each other, with the end faces 112 ' . 113 ' the thigh 112 . 113 perpendicular to the outer surfaces 112 ' . 113 ' the thigh 112 . 113 are arranged.

The in the area of the opposing inner surfaces 114 . 115 of the two legs 112 . 113 of the holder 110 provided guide groove 116 . 116 ' are formed standing at an acute angle to each other.

The one in the 4 to 6 shown, releasably fixed in the holder 110 insertable stud body 120 is in the area of a lower end with a anchor bag 122 for releasably firm gripping of the anchoring pin 118 of the holder 110 provided, that of two mutually opposite projections 123 . 124 is formed, each with a bore 123 ' . 124 ' to receive one also through the hole 119 of the anchoring pin 118 guided locking pin 130 are provided.

The stud body 120 has two side surfaces arranged parallel to each other 141 . 142 and adjacent to these two front surfaces arranged at a predetermined angle to one another 143 . 144 on, each with a centering bar designed as a projection 121 . 121 ' are provided for interaction with a respective guide groove 116 . 116 ' of the holder 110 is provided.

The two centering bars 121 . 121 ' of the two opposing front surfaces 143 . 144 are arranged at an acute angle to each other, which corresponds to the angle at which the two facing each other on the respective legs 112 . 113 of the holder 110 trained guide groove 116 . 116 ' are arranged around a stud body 120 in a coherent engagement in a holder 110 bring to.

In the illustrated embodiment, the respective front surfaces 143 . 144 of the stud body 120 in two at an obtuse angle 160 partial areas facing each other 143 ' . 143 '; 144 ' . 144 ' divided up.

The stud body 120 is in the area of its side faces 141 . 142 with a plurality of cutting elements designed as respective projections 170 equipped and in the area of its upper end 120 ' with a cutting body 180 each with two opposing cutting edges arranged at an angle to the outside 181 . 182 provided, being at a predetermined obtuse angle 160 to a respective cutting edge 181 . 182 two adjoining cutting surfaces 183 . 183 ' . 184 . 184 ' are arranged.

The cutting body 180 is also in the area of its on the side surfaces 141 . 142 of the stud body 120 adjacent side surfaces also with a plurality of cutting elements designed as respective projections 170 provided, in particular the surface 187 of the cutting body 180 with a plurality of cutting elements designed as respective projections 170 is provided.

In the in 9 The illustrated embodiment of a holder device according to the invention forms a cutting body 180 one from the tunnel body 120 separate structural unit that is detachably fixed to the stud body 120 is connectable.

The cutting body 180 has a cutting body 190 as well as a connection body firmly connected to it 195 for a detachable fastening of the cutting body 190 on the stud body 120 on.

The connecting body 195 is with a hole 196 provided, by means of which the connecting body 195 in combination with a locking pin 130 releasably fixed in a corresponding recess 198 of the stud body 120 can be anchored.

The locking pin 130 is in the area of at least one of its end faces 130 ' with a plurality of slots parallel to the longitudinal axis 131 provided, by means of which an irreversible increase in the diameter of the relevant end of the locking pin 130 is possible.

An insertion of the holder 110 into the wall of an earth auger by welding the holder 110 in the wall of the earth auger.

Soil to be extracted with the aid of the earth auger is conveyed out of the earth auger by means of a rotation element arranged inside the earth auger through an upper opening of the earth auger, the rotation element being formed by a helical screw.

The exemplary embodiment of the invention explained above serves only the purpose of a better understanding of the teaching according to the invention, which is not limited as such by the exemplary embodiment.

LIST OF REFERENCE NUMBERS

100 =

Holder device

110 =

holder

111 =

connecting web

112, 113 =

interconnected bracket legs

112 ', 113' =

flat end faces of the holder legs

112 ", 113" =

Outer surfaces of the holder legs

114, 115 =

opposing inner surfaces of the legs

116, 116 '=

guide

117 =

Inner surface of the connecting web

118 =

anchoring pin

119 =

Hole in the anchoring pin

120 =

cleat body

120 '=

upper end of the stud body

121, 121 '=

Centering bar of the stud body

122 =

anchor bag

123, 124 =

opposing projections

123 ', 124' =

Bores of the projections

130 =

safety pin

130 '=

Face of the locking pin

131 =

slots

141, 142 =

Side surfaces of the stud body

143, 144 =

Front surfaces of the stud body

143 ', 143 ", 144', 144" =

Partial surfaces of the front surfaces of the stud body

170 =

cutting elements

180 =

cutting body

181, 182 =

Cutting edges of the cutting body

183, 183 ', 184, 184'

= Cutting surfaces

187

= Surface of the cutting body

190

= Cutting body

195

= Connecting body

196

= Bore of the connection body

198

= Recess of the stud body

Claims (8)

A holder device (100) for releasably attaching a stud body (120) for cutting soil into the lower end face of a hollow cylindrical wall of an earth auger, with an essentially U-shaped holder (110), the two of which are connected via a connecting web (111 ) interconnected legs (112, 113) in the area of the mutually opposing inner surfaces (114, 115) are provided with a guide groove (116, 116 ') for receiving a centering web (121, 121') of a stud body (120), characterized that an anchoring pin (118) is provided in the area of the inner surface (117) of the connecting web (111), which is provided with a bore (119) for the insertion of a locking pin (130) with which an exchangeable stud body (120) can be detachably attached which can be anchored to the holder (110) and in the area of the mutually opposing inner surfaces (114, 115) of the two legs (112, 113) of the holder s (110) provided guide grooves (116, 116 ') are formed standing at an acute angle to one another, the stud body (120) having two mutually parallel side surfaces (141, 142) and adjoining each two front surfaces (143 arranged at a predetermined angle to one another , 144). Device (100) after Claim 1 , characterized in that the holder legs (112, 113) are provided with a flat end face (112 ', 113') in the region of an end remote from the connecting web (111). Device (100) after Claim 2 , characterized in that the outer surfaces (112 ", 113") of the legs (112, 113) are arranged parallel to one another. Device (100) according to the Claims 2 and 3 , characterized in that the end faces (112 ', 113') of the legs (112, 113) are arranged at right angles to the outer surfaces (112 ", 113 '') of the legs (112, 113). Device (100) according to one of the preceding claims, characterized in that the stud body (120) is provided in the region of a lower end with an anchoring pocket (122) for releasably firmly enclosing the anchoring pin (118) of the holder (110). Device (100) after Claim 5 , characterized in that the anchoring pocket (122) is formed by two projections (123, 124) which are opposite one another at a predetermined distance, each with a bore (123 ', 124') for receiving a likewise through the bore (119) of the anchoring pin (118) guided locking pin (130) are provided. Device (100) according to one of the preceding claims, characterized in that the two respective front surfaces (143, 144) adjoining one another at a predetermined angle are provided with a centering web (121, 121 ') which is designed as a projection and which interacts with the respective guide groove (116, 116 ') of the holder (110) is provided. Device (100) after Claim 7 , characterized in that the two centering webs (121, 121 ') of the two opposing front surfaces (143, 144) are arranged at an acute angle to one another which corresponds to the angle at which the two opposing sides on the respective legs ( 112, 113) of the holder (110) formed guide grooves (116, 116 ') are arranged.

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