US3690390A - Threaded joint type connection for a drill in a hammer drill - Google Patents

Threaded joint type connection for a drill in a hammer drill Download PDF

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Publication number
US3690390A
US3690390A US880748A US3690390DA US3690390A US 3690390 A US3690390 A US 3690390A US 880748 A US880748 A US 880748A US 3690390D A US3690390D A US 3690390DA US 3690390 A US3690390 A US 3690390A
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United States
Prior art keywords
drill
socket
extension
bore
engagement means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US880748A
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English (en)
Inventor
Franz Chromy
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Hilti AG
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Hilti AG
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Publication date
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Publication of US3690390A publication Critical patent/US3690390A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0473—Details about the connection between the driven shaft and the tubular cutting part; Arbors
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete

Definitions

  • ABSTRACT In a hammer drill a threaded joint type engagement is provided between the drill and the drill socket.
  • the drill is threaded into the drill socket and the threaded engagement is continuously tightened and loosened during operation and can be easily disassembled for replacement of the drill.
  • the drill is arranged in the socket so that the impact energy from the hammer drill is transmitted without affecting the interengaged connection of the parts.
  • the present invention is directed to the replaceable engagement of drills in the drill socket of a hammer drill and, more particularly, it is concerned with a threaded joint type engagement of the drill within the drill socket.
  • the drills In drill hammers the drills must each have the same diameter drill shaft for fitting into the tool receiver independent of the diameter of the drill itself. Larger drills require a correspondingly larger drill shaft. Ac cording1y, the tool receiver of the drill hammer must be dimensioned to accept the range of drills employed. To be able to use drills of both small and large diameters, it is necessary to use a drill socket which has both a shaft for insertion into the tool receiver and a receiver or socket for the drill.
  • drill sockets which have a receiving bore that tapers conically in the direction of the shaft of the drill socket.
  • the shaft of the drill to be inserted into the receiving bore is conically shaped so that the drill is held by the friction developed between the coinciding conical surfaces when the drill is inserted into thedrill socket.
  • Friction type joints or connections between the shaft of a drill and the bore of a drill socket have a number of disadvantages.
  • a part of the impact energy transmitted from the hammer drill is converted into heat by the friction between the contacting conical surfaces. Due to the blows exerted by the hammer drill on the drill socket, the drill is driven into the drill socket so that it becomes difficult to remove and its replacement can be achieved only by considerable effort using a wedge and a hammer.
  • the interior conical surface on the drill socket and the exterior conical surface on the shaft of the drill must be formed very accurately in relationship to one another, otherwise, it is not possible to disengage the drill from the socket or the socket does not properly hold the drill in place.
  • the production of such drills and drill sockets requires maximum precision with only small tolerances between the two with the result that production costs are increased.
  • a screw or threaded joint is provided between the shaft of the drill and the bore in the drill socket.
  • Such a joint assures a firm connection between the drill and drill socket during operation of the hammer drill and also provides easy disengagement of the drill from the socket.
  • this type of connection seizing of the drill within the drill socket is not possible because, though the joint is tightened by the circumferential force exerted on the drill, it is also loosened by the blows of the percussion piston in the hammer drill exerted on the drill socket.
  • the impact energy exerted by the hammer drill can be transmitted almost completely to the working edge of the drill since the conversion of impact energy into friction energy is considerably less in this arrangement than in the previously known conically shaped joints.
  • Another advantage in the present joint construction is that tolerance accuracy of the degree previously required is no longer necessary. Further, shorter drill shafts and shallower socket bores are both possible with the result that considerably less material is required. Because of these characteristics of the joint of the present invention the production costs are reduced as compared to the prior art.
  • the screw joint has a multiple thread so that a rapid and safe connection can be obtained between the drill and the drill socket.
  • the drill socket is threaded, preferably with a round thread, and the shaft or extension on the drill which seats within the socket is provided with a corresponding thread.
  • projections are provided along the circumferential periphery of the drill shaft and corresponding helically extending grooves are formed within the bore of the socket.
  • the bore in the drill socket is provided, preferably, with grooves extending parallel to its longitudinal axis.
  • the threaded extension or shaft on the drill has a diameter which is equal to or greater than the diameter of the drill proper and its length is such that it can be screwed into the bore in the drill socket until its end face contacts the bottom of the bore.
  • the threaded extension of the drill has a diameter which is smaller than that of the drill and its length is less than the depth of the bore in the drill socket.
  • end of the extension on the drill and the bottom of the bore of the drill socket prefferably be coplanar, so that the transmission of impact energy to the drill is improved.
  • FIG. 1 is a side view, partly in section, of a drill connected within a drill socket in accordance with the present invention and with a drill hammer represented schematically in phantom;
  • FIG. 2 is a view, similar to FIG. 1 illustrating another embodiment of the connection of a drill within a drill socket in accordance with the present invention
  • FIG. 3 is a view similar to FIG. 2, which shows still another embodiment of the connection of a drill into a drill socket in accordance with the present invention with theaddition of a crown drill mounted on the drill;
  • FIG. 4 is a partial view, partly in section, of another embodiment of DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 5 is a view, partly in section, of a drill socket
  • FIG. 6 is a partial view of a drill arranged for engagementwithin the drill socket in FIG. 5.
  • a hammer drill 1 shown in phantom has a tool receiver 2 at one end and contains a percussion piston 3. Positioned within the tool receiver 2 is a drill socket 4. At one end the drill socket 4 has an insert shaft 4a which extends into the hammer drill for operative contact with the percussion piston 3. Inthe opposite end of the drill socket 4 a bore 40 having a female circular thread 4b is provided. A drill 6 having a male circular thread 6a on an extension or shaft at one end is threaded into'the drill socket bore 40 until its end face 6b contacts the bottom surface 4d of the bore. The outside diameter of the male thread 6a is greater than the diameter of the bit portion of the drill 6.
  • the interconnected drill socket 4 and drill 6 are driven in the direction of rotation by the tool receiver 2. Due to the rotational action the drill 6 is screwed more tightly into the-bore 40 because of the resistance developed at the cuttingedge of the drill. However, because of the action of the percussion piston 3 onthe end of the shaft 4a of the drill socket 4 which is transmitted through the bottom surface 4d of thebore 40 to the end face 6b of the drill extension, the screw joint between the drill and the drill socket is loosened somewhat. This tightening and loosening process is repeated continuously during the operation of the hammer drill.
  • the drill 6 can be easily removed from the drill socket 4 if the socket is pressed against the tool receiver by means of an auxiliary tool and the drill hammer is started up. Since the drill is not in contact with any surface, there is no tendency for a tightening action between the drill and drill socket, however, the hammering action of the percussion piston 3 will loosen the threaded engagement for easy removal.
  • a drill 8 is provided on which the diameter of the bit portion of the drill is greater than the diameter of its male thread 8a on the extension which projects from the bit portion.
  • an annular surface or shoulder 8b is formed in a plane transverse to the longitudinal direction of the drill.
  • the length of the threaded portion 8a of the drill 8 is less than the depth of the bore 40 in the drill socket 4, with the result that the blows exerted on the drill socket are transmitted to the annular shoulder 8b on the drill from the corresponding end face of the drill socket.
  • the male thread 8a on the drill 8 is interrupted by a longitudinal groove which extends in parallel relationship to the longitudinal axis of the bore 4c and acts in the manner of a bayonet lock.
  • a drill 10 similar to that shown in FIG. 1, is provided with an elongated extension containing a male thread 10a with a crown drill ll threaded onto a portion of the thread 10a.
  • the threaded extension of the drill is seated at its end face 10b against the base 4d of the bore in the drill socket 4 while the end face of the drill socket containing the bore contacts the end surface 110 of the crown drill.
  • the transmission of the action of the percussion piston in FIG. 3 is a combination of the actions described by FIGS. 1 and 2.
  • the rotational action provided by the tool receiver 2 is transmitted to the drill 10 from the base surface 4d of the bore to the end face 10b of the drill while the action from the socket 4 to the crown drill 11 is transmitted across the end face of the socket to the end surface 1 1a of the crown drill.
  • the transmission of the action of the percussion piston is obtained without damage to the thread 4b in the bore and the thread 10a on the drill.
  • a multiple female thread 46 is formed in the socket 4 and a multiple male thread 6a is formed on the end of the drill 6 which seats within the socket.
  • the socket 4 has a helical groove 4e and in FIG. 6 the end of the drill has a projection 8d which fits into the helical groove 4e.
  • a drilling device comprising a hammer drill having a tool receiver opening therein, a percussion piston positioned within said hammer drill, a drill socket comprising a shaft on one end thereof for operative engagement within the tool receiver opening in said hammer drill and a socket bore in the other end thereof, a drill arranged to be operatively secured within said socket bore, wherein the improvement comprises engagement means formed within said socket bore, an extension formed on the end of said drill to be secured within said socket bore, said extension having a diameter at least equal to the diameter of said drill and having a length sufficient for its transverse end face to contact the bottom surface in said socket bore, engagement means fonned on said extension, and said extension arranged to fit within said socket bore with said engagement means thereon rotated into interlocking engagement with said engagement means in said socket bore.
  • a drilling device as set forth in claim 1, wherein said engagement means in said socket bore comprises a multiple female thread and said engagement means on said drill extension comprises a multiple male thread.
  • a drilling device as set forth in claim 1, wherein said engagement means on said drill extension comprises at least one projection formed on the circumferential periphery thereof and said engagement means in said socket bore comprises at least one helically extending groove formed in the circumferential periphery of said socket bore for receiving said projection on said drill extension.
  • a drilling device as set forth in claim 1, wherein the end face of said drill extension and the bottom surface of said socket bore are coplanar.
  • a drilling device as set forth in claim 1, wherein said drill extension has a diameter at least equal to the diameter of said drill and has a length greater than the depth of said socket bore so that when the end face of said extension contacts the bottom surface in said bore a portion of its threaded circumferential periphery extends outwardly from the end face of said socket containing said bore, a crown drill having a diameter greater than the diameter of said drill is threaded onto the portion of said drill extension projecting from said socket, and the end surface of said crown drill into which said extension is threaded is in contacting engagement with the end face of said socket containing said bore, whereby the action of said percussion piston is transferred to the end face of the extension of said drill from the bottom surface of said bore and to the end surface of said crown drill from the end face of said drill socket.
  • a drilling device as set forth in claim 1, wherein said engagement means in said socket bore comprises a circular female thread and said engagement means on said drill extension comprises a circular male thread.
  • a drilling device as set forth in claim 6, wherein at least one longitudinally extending groove is formed on the circumferential periphery of said drill extension and said groove extends in the axial direction of said drill across said circular threads formed thereon, and at least one longitudinally extending groove is formed in and extends in the axial direction of said socket bore traversing the female thread in said socket bore.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
US880748A 1968-12-02 1969-11-28 Threaded joint type connection for a drill in a hammer drill Expired - Lifetime US3690390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681812229 DE1812229A1 (de) 1968-12-02 1968-12-02 Bohrer bzw. Bohrerhalter fuer Bohrhaemmer

Publications (1)

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US3690390A true US3690390A (en) 1972-09-12

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US880748A Expired - Lifetime US3690390A (en) 1968-12-02 1969-11-28 Threaded joint type connection for a drill in a hammer drill

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US (1) US3690390A (enrdf_load_html_response)
CH (1) CH507067A (enrdf_load_html_response)
DE (1) DE1812229A1 (enrdf_load_html_response)
FR (1) FR2024992A1 (enrdf_load_html_response)
GB (1) GB1261776A (enrdf_load_html_response)
SE (1) SE386394B (enrdf_load_html_response)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440082A1 (de) * 1974-08-19 1976-04-01 Reinholdt As H Hammerbohrereinrichtung
US4002214A (en) * 1974-04-23 1977-01-11 Hawera Probst Kommanditgesellschaft Harmetall-Werkzeugfabrik Ravensburg Drilling tool, especially for hammer drills
US4007795A (en) * 1976-02-13 1977-02-15 Skil Corporation Attachment for a rotary-hammer tool
US5979913A (en) * 1998-05-19 1999-11-09 Kosik; Thomas Universal driving and setting tool and method of using same
US6116827A (en) * 1997-09-13 2000-09-12 Hawera Probst Gmbh Drilling tool
US20020108789A1 (en) * 2001-01-17 2002-08-15 Martin Schautt Drilling head of a rock drill
US20160059322A1 (en) * 2014-08-29 2016-03-03 Seth Breslaw Second stage drill bit
US20180001395A1 (en) * 2016-06-30 2018-01-04 Shehkai Precision Co., Ltd. Dust vacuuming drill device with an internal dust passageway and method for producing the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK56178A (da) * 1978-02-07 1979-08-08 M B Nielsen Fremgangsmaade og vaerktoej til brug ved boring af et hul i armeret beton
FI108006B (fi) * 1994-08-09 2001-11-15 Sandvik Tamrock Oy Rikotuslaitteen työväline
GB2314287B (en) * 1996-06-19 2001-01-10 John Terrance Crilly Hand held power tools

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868507A (en) * 1954-07-26 1959-01-13 American Percussion Tool Compa Well drilling equipment
US2873093A (en) * 1956-09-19 1959-02-10 Jersey Prod Res Co Combined rotary and percussion drilling apparatus
US3050032A (en) * 1960-12-30 1962-08-21 Carey Machine & Supply Inc Percussion-type drill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868507A (en) * 1954-07-26 1959-01-13 American Percussion Tool Compa Well drilling equipment
US2873093A (en) * 1956-09-19 1959-02-10 Jersey Prod Res Co Combined rotary and percussion drilling apparatus
US3050032A (en) * 1960-12-30 1962-08-21 Carey Machine & Supply Inc Percussion-type drill

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002214A (en) * 1974-04-23 1977-01-11 Hawera Probst Kommanditgesellschaft Harmetall-Werkzeugfabrik Ravensburg Drilling tool, especially for hammer drills
DE2440082A1 (de) * 1974-08-19 1976-04-01 Reinholdt As H Hammerbohrereinrichtung
US4007795A (en) * 1976-02-13 1977-02-15 Skil Corporation Attachment for a rotary-hammer tool
US6116827A (en) * 1997-09-13 2000-09-12 Hawera Probst Gmbh Drilling tool
US5979913A (en) * 1998-05-19 1999-11-09 Kosik; Thomas Universal driving and setting tool and method of using same
US20020108789A1 (en) * 2001-01-17 2002-08-15 Martin Schautt Drilling head of a rock drill
US6843334B2 (en) * 2001-01-17 2005-01-18 Hilti Aktiengesellschaft Drilling head of a rock drill
US20160059322A1 (en) * 2014-08-29 2016-03-03 Seth Breslaw Second stage drill bit
US20180001395A1 (en) * 2016-06-30 2018-01-04 Shehkai Precision Co., Ltd. Dust vacuuming drill device with an internal dust passageway and method for producing the same

Also Published As

Publication number Publication date
FR2024992A1 (enrdf_load_html_response) 1970-09-04
SE386394B (sv) 1976-08-09
DE1812229A1 (de) 1971-01-14
CH507067A (de) 1971-05-15
GB1261776A (en) 1972-01-26

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