US3896888A - Electric hammer - Google Patents

Electric hammer Download PDF

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Publication number
US3896888A
US3896888A US457561A US45756174A US3896888A US 3896888 A US3896888 A US 3896888A US 457561 A US457561 A US 457561A US 45756174 A US45756174 A US 45756174A US 3896888 A US3896888 A US 3896888A
Authority
US
United States
Prior art keywords
crankshaft
cylinder
motor
striker
motor shaft
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
US457561A
Other languages
English (en)
Inventor
David Norman William Badcock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PRECIS (188) Ltd
Kango Wolf Power Tools Ltd
Original Assignee
Kango Electric Hammers Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kango Electric Hammers Ltd filed Critical Kango Electric Hammers Ltd
Application granted granted Critical
Publication of US3896888A publication Critical patent/US3896888A/en
Assigned to KANGO WOLF POWER TOOLS LIMITED reassignment KANGO WOLF POWER TOOLS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PRECIS (188) LIMITED
Assigned to PRECIS (188) LIMITED reassignment PRECIS (188) LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: KANGO ELECTRIC HAMMERS LIMITED
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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • 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
    • 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
    • Y10T74/19—Gearing
    • Y10T74/19619—Displaceable elements
    • 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
    • Y10T74/21—Elements
    • Y10T74/2186—Gear casings

Definitions

  • ABSTRACT [22] Filed: Apr. 3, 1974 The casing of a portable electric percussion tool in- Appl. No; 457,561
  • a one-piece casting which carries (a) a cylinder for supporting a reciprocating driver and striker (b) a drive shaft for rotating a tool holder to which blows are transmitted by the striker (c) a bearing for the motor shaft of an electric motor (d) the end portion of the stator enclosure of the motor nearer the said bearing for the motor shaft, and (e) a crankshaft which is driven by the motor shaft through gearing and which drives the drive shaft and reciprocates the driver.
  • the lengthwise axis of the cylinder and the rotational axes of the drive shaft and motor shaft are parallel to each other, and at right angles to the axis of rotation of the crankshaft.
  • a portable percussion tool comprising a casing incorporating a cylinder in which a driver and a striker are disposed for reciprocating motion.
  • an air chamber being formed axially betweenthe driver and striker in which chamber a quantity of air is trapped, a rotary tool holder mounted for rotary movement in alignment with the striker, ananvil carried in saidv holder arranged to be struck directly or indirectly by the striker, an electric motor whereof the motor shaft is parallelto the axis of the cylinder, adriving shaft disposed parallel to the motor shaft and the cylinder and arranged to rotate the tool holder, and a crankshaft which is disposed at right angles to the motor shaft, said driving shaft and the axis of the cylinder and which is driven by the motor shaft through gearing and drives the driving shaft, said crankshaft having a crankpin connected'to reciprocate the driver through a connecting rod, and said casing including a one-piece casting or moulding'which carries the cylinder, the drive shaft and the crankshaft
  • FIG. 1 is a side elevation, partly in section, of a tool according to the invention
  • FIG. 2 is a plan view which corresponds to FIG. 1 but in which the motor and the rear part of the casing are shown separated from the central body of the tool, the crankshaft being shown in side elevation, and
  • FIG. 3 is an end elevation on the plane 33 of FIG. 1.
  • the portable percussion tool shown is powered by an electric motor of double-insulated construction and having on its output shaft 11 a bevel pinion 12 which meshes with a bevel gear 13 located on one end of a crankshaft 14.
  • the crankshaft is disposed at right angles to the motor shaft and includes in its length a pre-set overload clutch 15.
  • the other end of the crankshaft carries a crankpin 16 which transmits a reciprocating movement to a driver 17 through a connecting rod 17a.
  • Driver 17 is slidably mounted in a f xed cylinder sleeve 18 and provides within itself a cylinder in which a piston portion 20 of a striker 21 is mounted for reciprocating movement.
  • the driver and the piston portion of the striker form between them a closed air chamber 23.
  • the striker comprises also a. extension 24 which projects axially from the cylinder n the driver and from the cylinder sleeve into a recoil :ieeve 25 encircled by a tool holder 26 which is mounted in a fixed sleeve 27 in front casing part 49 of the tool for rotation about an axis aligned with that of the cylinder sleeve 18.
  • An anvil 28 provided with sealing rings is mounted for axial sliding coil sleeve 25 and the inner end of the shank of a tool biti(not .shown).
  • The;-shank ,of-the bit isof hexagonal sectionand is slid-able lengthwise ofitself between two end positions 'ina correspondingly shapedsocket in the tool holder.
  • the depth of mesh between the teeth of gears 32,- 33, is adjustable by means ofa screw.-36 engaging the end of the drive shaft 31.
  • a one-piece moulding 40 in the form of a pressure die casting housesthe cylinder sleeve 18 and provides support for bearings 41, 42 for the drive shaft, for bearing's 43, 44 for the crankshaft and for a bearing 45 for the motor shaft. Bearings 43, 44 are supported in lugs 46, 47 on the casting projecting into aspace enclosed by relatively massive handle moulding 48'.
  • the moulding 40 provides a recess 52 in which the ad jacent end portion 53 of the stator enclosure of the motor is located against radial movement; the bearing 45 of the motor shaft is not supported by the stator enclosure and the arrangement thus ensures accurate centering of the motor shaft with respect to the moulding without imposing any loading on the motor shaft due to eccentricity of the shaft with respect to the stator enclosure.
  • the stator enclosure in the illustrated construction carries the brush gear of the motor.
  • the method of assembling the principal components of the central body of the tool is as follows. Fixed sleeve 27 and threaded insert carrying screw 36 are secured in front casing 49. The tool holder 26 carrying anvil 28, recoil sleeve 25 and associated parts is inserted into fixed sleeve 27. Fixed sleeve 18 and block 39 are secured in moulding 40. Driver 17 carrying connecting rod 17a and striker 21 are inserted in fixed sleeve 18, ring 38 is located in'the groove provided in block 39. Front casing 49 and associated parts are assembled to moulding 40 and associated parts and secured by lower screws 58.
  • crankshaft assembly 14 is then inserted into its bearing lugs from beneath, the crankpin 16 being engaged in the eye of the connecting rod 17a.
  • Shims are inserted between a thrust bearing 59 of the crankshaft and the adjacent surface of the lug 47 to provide the correct mesh between the bevel gears 12, 13 and for purposes of determining the required thickness of the shims, shims having a gap in their periphery being employed.
  • the motor is moved outwards until the tip of bevel pinion 12 will allow bevel 13 to pass freely over it and the crankshaft is then removed, provided with the appropriate permanent shims and replaced. The motor is then replaced and secured tening together of a number of componentcasing parts,
  • a portable percussion tool comprising a casing incorporating a cylinder, a driver and a striker disposed for reciprocating motion in the cylinder, an air chamber being formed axially between the driver and striker in which chamber a quantity of air is trapped, a rotary tool holder mounted for rotary movement in alignment with the striker, an anvil carried in said holder arranged to be struck directly or indirectly by the striker, an electric motor including a stator and stator enclosure and a motor shaft extending therethrough and disposed parallel to the axis of the cylinder, a driving shaft disposed parallel to the motor shaft and the cylinder and arranged to rotate the tool holder, and a crankshaft which is disposed at right angles to the motor shaft and which has a crankpin connected to reciprocate the driver, first meshing bevel gears mounted on the crankshaft and the motor shaft respectively, second meshing bevel gears mounted on the crankshaft and the drive shaft respectively, means for locating the drive shaft against movement axially of itself in a direction away from the cranks
  • crankshaft incorporates an overload clutch through which the first bevel gear on the crankshaft is connected to drive the second bevel gear on the crankshaft and the crankpin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Drilling And Boring (AREA)
US457561A 1973-04-05 1974-04-03 Electric hammer Expired - Lifetime US3896888A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1645873A GB1467253A (en) 1973-04-05 1973-04-05 Portable percussive tools

Publications (1)

Publication Number Publication Date
US3896888A true US3896888A (en) 1975-07-29

Family

ID=10077704

Family Applications (1)

Application Number Title Priority Date Filing Date
US457561A Expired - Lifetime US3896888A (en) 1973-04-05 1974-04-03 Electric hammer

Country Status (6)

Country Link
US (1) US3896888A (Direct)
JP (1) JPS5027172A (Direct)
CH (1) CH591934A5 (Direct)
FR (1) FR2224216B3 (Direct)
GB (1) GB1467253A (Direct)
NL (1) NL7404610A (Direct)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580460A (en) * 1984-07-30 1986-04-08 The Singer Company Bevel gear backlash adjusting mechanism
US6785943B2 (en) * 1998-09-04 2004-09-07 Hardinge, Inc. Indexing tool turret
US20130019483A1 (en) * 2011-04-01 2013-01-24 Michael Naughton Reciprocating saw, such as a jigsaw
CN103056845A (zh) * 2013-01-30 2013-04-24 湖南理工学院 手持式锤钻工具机
EP2821183A1 (en) * 2013-07-05 2015-01-07 Black & Decker Inc. Hammer Drill
US20220324090A1 (en) * 2021-04-07 2022-10-13 Milwaukee Electric Tool Corporation Impact power tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932413A1 (de) * 1989-09-28 1991-04-11 Bosch Gmbh Robert Bohrhammer
DE102006027110A1 (de) * 2006-06-12 2007-12-13 Robert Bosch Gmbh Hydraulische Handhebelpresse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203490A (en) * 1963-06-27 1965-08-31 Black & Decker Mfg Co Compact rotary hammer
US3517755A (en) * 1967-05-04 1970-06-30 Kango Electric Hammers Ltd Portable electric percussion tools
US3828863A (en) * 1972-08-31 1974-08-13 Bosch Gmbh Robert Combined portable electric impact wrench and chipping hammer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203490A (en) * 1963-06-27 1965-08-31 Black & Decker Mfg Co Compact rotary hammer
US3517755A (en) * 1967-05-04 1970-06-30 Kango Electric Hammers Ltd Portable electric percussion tools
US3828863A (en) * 1972-08-31 1974-08-13 Bosch Gmbh Robert Combined portable electric impact wrench and chipping hammer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580460A (en) * 1984-07-30 1986-04-08 The Singer Company Bevel gear backlash adjusting mechanism
US6785943B2 (en) * 1998-09-04 2004-09-07 Hardinge, Inc. Indexing tool turret
US20130019483A1 (en) * 2011-04-01 2013-01-24 Michael Naughton Reciprocating saw, such as a jigsaw
US10413980B2 (en) * 2011-04-01 2019-09-17 Milwaukee Electric Tool Corporation Reciprocating saw, such as a jigsaw
CN103056845A (zh) * 2013-01-30 2013-04-24 湖南理工学院 手持式锤钻工具机
CN103056845B (zh) * 2013-01-30 2015-05-27 湖南理工学院 手持式锤钻工具机
EP2821183A1 (en) * 2013-07-05 2015-01-07 Black & Decker Inc. Hammer Drill
US9925653B2 (en) 2013-07-05 2018-03-27 Black & Decker Inc. Hammer drill
US20220324090A1 (en) * 2021-04-07 2022-10-13 Milwaukee Electric Tool Corporation Impact power tool
US11858100B2 (en) * 2021-04-07 2024-01-02 Milwaukee Electric Tool Corporation Impact power tool

Also Published As

Publication number Publication date
JPS5027172A (Direct) 1975-03-20
AU6749574A (en) 1975-10-09
FR2224216B3 (Direct) 1977-02-18
GB1467253A (en) 1977-03-16
CH591934A5 (Direct) 1977-10-14
FR2224216A1 (Direct) 1974-10-31
DE2416191B2 (de) 1976-03-18
DE2416191A1 (de) 1974-11-14
NL7404610A (Direct) 1974-10-08

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Legal Events

Date Code Title Description
AS Assignment

Owner name: KANGO WOLF POWER TOOLS LIMITED, LOMBARD ROAD, MORD

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PRECIS (188) LIMITED;REEL/FRAME:004282/0352

Effective date: 19840323

Owner name: PRECIS (188) LIMITED

Free format text: CHANGE OF NAME;ASSIGNOR:KANGO ELECTRIC HAMMERS LIMITED;REEL/FRAME:004282/0351

Effective date: 19840613