US3693728A - Percussion and rotary drilling machine - Google Patents

Percussion and rotary drilling machine Download PDF

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Publication number
US3693728A
US3693728A US87459A US3693728DA US3693728A US 3693728 A US3693728 A US 3693728A US 87459 A US87459 A US 87459A US 3693728D A US3693728D A US 3693728DA US 3693728 A US3693728 A US 3693728A
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US
United States
Prior art keywords
shaft
abutment
manually operated
axis
blocking
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
US87459A
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English (en)
Inventor
Reinhold Stroezel
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Individual
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Individual
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Filing date
Publication date
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Publication of US3693728A publication Critical patent/US3693728A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/062—Cam-actuated impulse-driving mechanisms
    • B25D2211/064—Axial cams, e.g. two camming surfaces coaxial with drill spindle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18024—Rotary to reciprocating and rotary

Definitions

  • the present invention is concerned with a portable percussion drilling machine which has a manually operated means for shifting the machine either to percussion drilling, or to rotary drilling.
  • the shaft is biassed by a spring in axial direction, the spring abutting a manually operated sleeve which has a cam track by which it is moved relative to the housing so that the displacement means for axially reciprocating the shaft can be rendered operative or inoperative by turning of the sleeve.
  • Drilling machines of this type have the disadvantage that the structural parts are complex and expensive to manufacture due to the required geometrical shape. Furthermore, the manually operated control means are sometimes displaced by the vibration produced by the percussion drilling operation. Also, the shifting of the machine between percussion drilling and rotary drilling takes a comparatively long time.
  • Another object of the invention is to provide manual control means, which remain in the position to which they were set even when the machine is subjected to strong vibrations during percussion drilling operations.
  • a manual control means is rotatably mounted in the housing of the machine, and has an abutment face eccentric to its axis. In the position rotary drilling," the abutment face supports the tool holder spindler against movement in axial direction so that the tool holder shaft cannot assume the percussion drilling position.”
  • a particularly safe arresting and blocking of the selected operational position can be obtained by providing on the manual control means, two substantially planar faces which are angularly staggered at least 90, and which have different distances from the axis.
  • the manual control means has a first abutment face in which the tool holder shaft can be placed in the percussion drilling position by pressure against the workpiece, while the second abutment face effects blocking of the tool holder shaft in a position in which it cannot be moved by pressure to the axial position in which it is axially reciprocated.
  • One embodiment of the invention comprises a housing; a tool holder shaft mounted on the housing for rotation about an axis, and for axial movement; first and second displacement means fixedly secured to the shaft and to the housing, respectively, and having an engaged position in which interacting projections and recesses reciprocate the shaft in axial direction during rotation for percussion drilling, and an axially spaced position in which the shaft only rotates for rotary drilling; actuating means including a blocking means movable along the shaft, and a spring; and manually operated means mounted on the housing for angular movement about the second axis and having abutment means eccentric to the second axis.
  • the actuating means abut the abutment means, which preferably includes two abutment faces of different eccentricity so that in a first position of the manually operable means the shah is held by the spring in the first axial position in which the first displacement means is spaced from the second displacement means until the shaft is pressed against a workpiece, and the spring yields, whereby the first and second displacement means engage each other and the shaft is axially reciprocated.
  • the blocking means directly engages the shaft and blocks the same and the first displacement means in a second axial direction in which the first and second displacement means remain spaced when pressed against the workpiece so that the shaft performs a rotary drilling operation.
  • the spring has ends abutting the shaft and the blocking means, respectively, and the blocking means abuts one or the other abutment face.
  • the blocking means includes a bearing sleeve having one end abutting the abutment faces, and a thrust ball bearing mounted on the shaft for axial movement and abutting the other end of the bearing sleeve. The spring abuts the thrust ball bearing in axial direction.
  • a third abutment face may be provided which is engaged by the blocking means in a third position of the manually operated means, and is spaced from the axis of the manually operated means a distance intermediate the distances which the first and second spaces are spaced from the same.
  • the blocking means engages the third abutment face, the shaft is blocked against movement due to the pressure against a workpiece in an intermediate position in which the first and second displacement means are partly engaged so that the shaft is reciprocated in shorter percussion strokes than in the first position of the manually operated means.
  • a fourth and a fifth abutment face can be provided for selectively blocking the reciprocating shaft in different positions corresponding to strokes of different length during percussion drilling.
  • FIG. I is a fragmentary side elevation, partially in longitudinal section
  • FIG. 2 is a fragmentary cross-sectional view, illustrating a detail and being taken on line "-11 in FIG. I;
  • FIG. 3 is a fragmentary cross-sectional view taken on line Il-II in FIG. I and illustrating a modification.
  • the portable percussion drilling machine 1 has a handle 2 secured to a motor housing 3, and a machine housing 4.
  • the motor not illustrated, drives a motor shaft 5 with a pinion 6 which is mounted in a bearing 7 carried by a partitioning wall 8, by which the motor housing 3 is separated from the machine housing 4.
  • Motor pinion 6 drives through other gears, not shown, a pair of gears 9 and 9a which are rotatably mounted on a shaft 9c to which they can be selectively coupled by coupling pins 9b, each of which has an operative position projecting into inner teeth of the respective gear, as shown for gear 9, and an inoperative position, shown for gear 9a.
  • shaft 90 can be operated at two different speeds, so that gear 9d which is fixed on shaft 9c, can drive a gear 10 at different speeds for rotating the tool holder shaft 11 at different speeds.
  • the manner in which the coupling means 9d are operated, is not an object of the present invention.
  • the front end of the tool holder shaft 11 has a threaded portion 12 on which a chuck, not illustrated, can be mounted for supporting a drill. Behind the threaded portion 12, the tool holder shaft 11 has a shaft portion 13 of greater diameter, having two flat faces which can be engaged by a wrench during opening and closing of the chuck, and for holding the shafts against rotation during screwing on and taking off the chuck.
  • the machine housing 4 has an opening 15 at its front end into which a bearing block 16 is pressed.
  • Tool holder shaft 11 is mounted in a bearing bore 16' of bearing block 16 by the cylindrical journal portion 13 in such a manner that shaft 11 can rotate and also move in axial direction.
  • a sealing means 18 in the recess 17 of the bearing block 16 prevents the loss of lubricating oil along the tool holder shaft 11.
  • Shaft 11 has a flange 19 which is followed by a threaded portion 20 of small diameter, rearwardly of which the cylindrical shaft portions 21, 22 and 23 of gradually reduced diameter are provided.
  • Gear 10 is screwed onto the threaded portion 20 of shaft 11, and abuts the flange 19.
  • gear 10 On its rear face, gear 10 has a ring of alternating projections and recesses 24, and a corresponding ring of recesses and projections 25 is provided on the front face of a disc or ring 26 which is fixedly secured to housing 4, by screws, not shown.
  • the threaded portion 20 of the tool holder shaft 11 is separated by a shoulder 20' from the cylindrical shaft portion 21.
  • a coil spring 27 surrounds the cylindrical portion 21 and abuts at one end on shoulder 20'.
  • the cylindrical portion 21 is separated from shaft portion 22 by the shoulder 21'.
  • a thrust bearing 28 is mounted on shaft portion 22, slidable on the same in axial direction.
  • the cylindrical end portions 23 of shaft 11 projects rearward toward partition wall 8.
  • a projecting portion 29 of partition wall 8 has a bore 30 registering with shaft 11, in which a substantially cylindrical sleeve 31 is mounted for longitudinal movement in axial direction.
  • the sleeve 31 has an inner bore 32 which has at its rear end for two-fifth of its length a greater diameter for receiving a bearing bushing 33.
  • shaft end portion 23 of shaft 11 is rotatable and slidable relative to the bearing bushing 33.
  • Spring 27 abutting shaft 11 and gear 10 at one end, presses at the other end against the thrust bearing 28 urging the same against the front end of the sleeve 31 so that the rear end of the same abuts an abutment face 40 of a manually operated control member 37.
  • a bore 34 is provided in the projecting portion 29 of partition wall 8 in which the manually operated means 35 is mounted for turning movement about an axis transverse to the axis of shaft 11.
  • the manually turnable means 35 has an upper portion 36 of small diameter which projects out of bore 34 and carries a knob 37 consisting of a synthetic material. Below the knob 37, an annular groove is provided in the shaft portion 35 in which a sealing ring 39 is located.
  • the manually turnable means 35 has at the height of sleeve 31 abutment means in the fonn of two abutment faces 40 and 41, see also FIG. 2, which in the direction of the axis of the manually turnable means 35, are somewhat wider than the sleeve 31, and define an angle of with each other.
  • the abutment face 40 is closer to the axis of the manually turnable means 35, while the abutment face 41 deviates from the circular shape a distance which is substantially a quarter of the radius.
  • the manually turnable means pushes the sleeve 31 and thrust bearing 28 forward until the thrust bearing 28 engages directly the shoulder 21' of shaft 11 and displaces the same forwardly to a position in which the projections and recesses of the displacement means 24 and 25 are axially spaced from each other. While the edge formed by the abutment faces 40 and 41 engages the sleeve 31, shaft 11 is displaced beyond its normal forward position to a position in which the front edge of flange 19 almost engages the inner surface 16" of the bearing block 16.
  • Percussion and drilling machine comprising a housing; a tool holder shaft mounted in said housing for rotation about a first axis, and for limited axial movement; first and second displacement rings secured to said housing and said shaft, respectively, and having confronting faces, each face having alternate projecting and recessed portions, said first and second faces having an engaged position in which said shaft reciprocates in axial direction for percussion drilling, and an axially spaced position in which said shaft only rotates for rotary drilling; spring means engaging said shaft for urging said shaft and first displacement ring away from said second displacement ring to said axially spaced position; blocking sleeve means mounted on the rear end of said shaft for axial movement; and manually operated means mounted on said housing for angular movement about a second axis perpendicular to, and intersecting said first axis rearward of said rear end, said manually operated means having at least first and second abutment faces spaced different radial distances from said second axis and cooperating with said blocking sleeve means so that when
  • said manually operated means include a third abutment face angularly spaced from said first and second abutment faces, and cooperating with said blocking sleeve means in a third angular position of said manually operated means; wherein said third abutment face is spaced from said second axis a radial distance greater than said first abutment face and smaller than said second abutment face so that in said third angular position of said manually operated means, when said front end of said shaft is pressed against said workpiece, said shaft is blocked by said blocking sleeve means and said third abutment face in an intermediate position in which said projecting and recessed portions of said faces of said displacement rings partly engage each other so that said shaft is reciprocated in a shorter percussion stroke than in said first angular position of said manually operated means.
  • Percussion and rotary drilling machine comprising a housing; a tool holder shaft mounted in said housing for rotation about first axis, and for axial movement; first and second displacement means fixedly secured to said shaft and said housing, respectively, and having an engaged position in which said shaft reciprocates during rotation for percussion drilling, and an axially spaced position in which said shaft only rotates for rotary drilling; actuating means including a blocking means movable along said shaft, and a spring having ends abutting said shaft and said blocking means, respectively; and manually operated means mounted on said housing for angular movement about a second axis and having abutment means eccentric to said second axis, said blocking means abutting said abutment means so that in a first position of said manually operated means, said shaft is held by said spring in a first axial position in which said first displacement means is spaced from said second displacement means until said shaft is pressed against a workpiece and said spring yields whereby said first and second displacement means engage each other and said shaft is axially reciprocated
  • abutment means includes two abutment faces angularly spaced at least 90 about said second axis and having different distances from said second axis.
  • said blocking means includes a bearing sleeve having one end abutting said abutment means, and a thrust ball bearing mounted on said shaft for axial movement and abutting the other end of said bearing sleeve, and wherein said spring abuts said thrust ball bearing.
  • said abutment means include a first abutment face engaged by said blocking means by the action of said spring in said first position of said manually operated means, and a second abutment face spaced a greater distance from said second axis than said first abutment face and engaged by said blocking means in said second position of said manually operated means.
  • said abutment means includes a third abutment face engaged by said blocking means in a third position of said manually operated means and being spaced from said second axis a distance intermediate the distances which said first and second faces are spaced from said second axis so that said blocking means blocks movement of said shaft due to pressure against a workpiece in an intermediate position in which said first and second displacement means are partly engaged so that said shaft is reciprocated in shorter percussion strokes than in said first position of said manually operated means.
  • first and second displacement means are first and second discs respectively secured to said shaft and said housing and having confronting faces, each of which has alternati pg'axially pr jectjng and accessed portions so that In a u y engage position, sai pro ecting portions said first disc completely enter the recessed portions of said second disc due to said spring, while in the partly engaged position, said projecting portions only partly enter said recesses due to said blocking means abutting said third abutment face and said shaft.
  • Drilling machine as claimed in claim 10 wherein said first disc is fixedly secured to said shaft and forms a shoulder with the same; and wherein said spring abuts said shoulder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
US87459A 1969-11-15 1970-11-06 Percussion and rotary drilling machine Expired - Lifetime US3693728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691957505 DE1957505A1 (de) 1969-11-15 1969-11-15 Tragbare Schlagbohrmaschine

Publications (1)

Publication Number Publication Date
US3693728A true US3693728A (en) 1972-09-26

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ID=5751185

Family Applications (1)

Application Number Title Priority Date Filing Date
US87459A Expired - Lifetime US3693728A (en) 1969-11-15 1970-11-06 Percussion and rotary drilling machine

Country Status (5)

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US (1) US3693728A (de)
JP (1) JPS501110B1 (de)
DE (1) DE1957505A1 (de)
FR (1) FR2069426A5 (de)
GB (1) GB1327436A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777825A (en) * 1971-09-04 1973-12-11 Impex Essen Vertrieb Hammer drilling machine
US3799275A (en) * 1971-02-05 1974-03-26 Bosch Gmbh Robert Hammer-drill
US3835715A (en) * 1972-07-13 1974-09-17 Black & Decker Mfg Co Hammer drill mechanism
US4189011A (en) * 1977-04-07 1980-02-19 Metabowerke Gmbh & Co. Hammer drill
US4378053A (en) * 1979-11-30 1983-03-29 Black & Decker Inc. Tool holder
US5125461A (en) * 1990-04-27 1992-06-30 Black & Decker, Inc. Power tool
US5201750A (en) * 1989-09-06 1993-04-13 Vascomed Institut Fur Kathetertechnologie Gmbh Dilation catheter with motor drive for dilation of blood vessels
US5494115A (en) * 1994-10-25 1996-02-27 Hwong; Steven Electric hammer drill
US20050194164A1 (en) * 2004-03-05 2005-09-08 Hitachi Koki Co., Ltd. Impact drill
EP3808478A1 (de) * 2019-10-14 2021-04-21 Nanjing Chervon Industry Co., Ltd. Schlagbohrmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916499A1 (de) * 1979-04-24 1980-11-06 Duss Maschf Elektro-handbohrmaschine mit vorrichtung zur wahlweisen umstellung fuer drehendes oder schlagendes bohren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH432338A (de) * 1965-01-13 1967-03-15 Metabowerke Kg Schlagbohrmaschine
US3395765A (en) * 1966-12-19 1968-08-06 Milwaukee Electric Tool Corp Small rotary hammer
US3433082A (en) * 1967-09-20 1969-03-18 Black & Decker Mfg Co Transmission and selector mechanism for alternate hammer and hammerdrill power tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH432338A (de) * 1965-01-13 1967-03-15 Metabowerke Kg Schlagbohrmaschine
US3395765A (en) * 1966-12-19 1968-08-06 Milwaukee Electric Tool Corp Small rotary hammer
US3433082A (en) * 1967-09-20 1969-03-18 Black & Decker Mfg Co Transmission and selector mechanism for alternate hammer and hammerdrill power tool

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799275A (en) * 1971-02-05 1974-03-26 Bosch Gmbh Robert Hammer-drill
US3777825A (en) * 1971-09-04 1973-12-11 Impex Essen Vertrieb Hammer drilling machine
US3835715A (en) * 1972-07-13 1974-09-17 Black & Decker Mfg Co Hammer drill mechanism
US4189011A (en) * 1977-04-07 1980-02-19 Metabowerke Gmbh & Co. Hammer drill
US4378053A (en) * 1979-11-30 1983-03-29 Black & Decker Inc. Tool holder
US5201750A (en) * 1989-09-06 1993-04-13 Vascomed Institut Fur Kathetertechnologie Gmbh Dilation catheter with motor drive for dilation of blood vessels
US5159986A (en) * 1990-04-27 1992-11-03 Black & Decker, Inc. Power tool
US5125461A (en) * 1990-04-27 1992-06-30 Black & Decker, Inc. Power tool
US5494115A (en) * 1994-10-25 1996-02-27 Hwong; Steven Electric hammer drill
US20050194164A1 (en) * 2004-03-05 2005-09-08 Hitachi Koki Co., Ltd. Impact drill
US7073605B2 (en) * 2004-03-05 2006-07-11 Hitachi Koki Co., Ltd. Impact drill
EP3808478A1 (de) * 2019-10-14 2021-04-21 Nanjing Chervon Industry Co., Ltd. Schlagbohrmaschine
US11673247B2 (en) 2019-10-14 2023-06-13 Nanjing Chervon Industry Co., Ltd. Impact drill

Also Published As

Publication number Publication date
GB1327436A (en) 1973-08-22
JPS501110B1 (de) 1975-01-14
FR2069426A5 (de) 1971-09-03
DE1957505A1 (de) 1971-05-19

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