US3367447A - Lubricating system for power tools - Google Patents

Lubricating system for power tools Download PDF

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Publication number
US3367447A
US3367447A US491930A US49193065A US3367447A US 3367447 A US3367447 A US 3367447A US 491930 A US491930 A US 491930A US 49193065 A US49193065 A US 49193065A US 3367447 A US3367447 A US 3367447A
Authority
US
United States
Prior art keywords
reservoir
oil
tool
chamber
piston
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
US491930A
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English (en)
Inventor
Frank J Consoli
David J Bobel
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.)
Skil Corp
Original Assignee
Skil Corp
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 Skil Corp filed Critical Skil Corp
Priority to US491930A priority Critical patent/US3367447A/en
Priority to GB41958/66A priority patent/GB1158051A/en
Priority to NL6613658A priority patent/NL6613658A/xx
Priority to DE1503220A priority patent/DE1503220C3/de
Priority to BE687643D priority patent/BE687643A/xx
Priority to CH1413766A priority patent/CH442891A/de
Application granted granted Critical
Publication of US3367447A publication Critical patent/US3367447A/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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/12—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with feed by capillary action, e.g. by wicks
    • 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
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/185—Pressure equalising means between sealed chambers

Definitions

  • a power tool includes a crank arm and gearing for reciprocating a piston in a barrel forming part of the tool.
  • the crank arm and gearing are contained in a chamber which is subjected alternately to high and low pressures because of movement of the piston.
  • the lubricating system includes a reservoir mounted on the inside of a cover plate for the chamber, which reservoir has a bore mounting a sintered member which acts as a wick for the lubrieating oil.
  • a one-way check valve is mounted in the cover plate and opens the reservoir and chamber to atmosphere during the creation of low pressure thereby to permit the lubricant to be drawn into the chamber for lubrication of the moving parts therein.
  • the one-way check valve closes preventing escape of the oil.
  • the present invention relates to lubrication of a power tool of the type having a reciprocating element which alternately creates high and low pressures in the tool; more particularly, the invention relates to new and improved means adapting such a tool for self-lubrication.
  • An object of the present invention is to provide, in a power tool of the type described, an oil reservoir uniquely associated with vent means and oil absorbent means whereby oil is forced into contact with the moving parts of the tool in response to creation of low pressure in the tool during its operation.
  • Another object of the present invention is to provide an oil trap in association with the aforementioned elements thereby to maintain the oil absorbent member substantially immersed in oil during manipulation of the tool throughout various positions.
  • FIG. 1 is a side elevational view of a power tool in which the present invention is incorporated, which tool is shown with a wall portion thereof broken away for illustration of the present invention;
  • FIG. 2 is an enlarged view taken along line 22 of FIG. 1 and showing the reservoir supporting plate partially broken away for better illustration of the reservoir and the oil absorbent member;
  • FIG. 3 is a section taken along line 3-3 of FIG. 2.
  • the present invention is adapted for use in a power tool of the type having a housing chamber enclosing movable parts, such as a crank arm and a piston rod, connected with a piston for reciprocating the same in a cylinder which opens into the chamber.
  • the present invention includes an oil reservoir mounted in the tool housing adjoining the chamber, which reservoir supports an oil absorbent member with a portion thereof in the reservoir for being immersed in oil therein and with another portion of the oil absorbent member exposed to the chamber.
  • a vent opens the reservoir to atmosphere and through the medium of the oil absorbent member also opens or communicates the chamber with atmosphere.
  • the present invention is shown incorporated in the rotary hammer forming the subject matter of Etzkorn et al. Patent 3,161,242, assigned to the assignee of the present invention. It will be understood that the present invention is shown in association with this Etzkorn et al. tool for purposes of illustration only; the present invention has equal utility in other forms of power tools which include a reciprocating member, such as a piston, which alternately creates high and low pressures in a chamber enclosing mechanical parts which actuate the piston.
  • a reciprocating member such as a piston
  • the Etzkorn et al. tool which is covered in the aforementioned patent and therefor of itself forms no part of the present invention, includes a housing 11) enclosing a suitable electric motor (not shown).
  • the tool also includes the usual handle 11 which supports a trigger 12 for activating the tool motor.
  • the electric motor drives an output gear 14 which meshes with another gear 15 for driving the latter.
  • Gear 15 is suitably journaled in the tool and is connected with a crank arm 16 for rotating the same.
  • Crank arm 16 is pivotally connected with a piston rod 17, which piston rod is pivotally connected with a piston 18 for reciprocating the same in a cylinder 21
  • Cylinder 20 contains a freely slidable piston or striker 21 which is pneumatically reciprocated by action of piston 18 for impacting engagement with the inner end of a working tool member 22.
  • Gear 15 has a smaller in diameter gear 23 associated therewith; this gear meshes with a larger diameter gear 24. This gear drives a bevel gear 25 meshing at a right angle with another bevel gear 26.
  • Bevel gear 26 is connected with cylinder 20 for rotating the latter, cylinder 20 being suitably journaled within the tool housing. Cylinder 20 serves to rotate the working tool member 22 as the latter is being struck or impacted by the striker. It should be apparent that working tool member 22 is simultaneously rotated and hammered upon operation of the rotaryharnmer tool.
  • the tool contains an upper housing portion 27 which defines a chamber 28 containing crank arm 16 and piston rod 17. Cylinder 20 opens into this chamber 28.
  • the present invention will be seen to include a plate 30 which is adapted to be secured to tool housing portion 27 for closing chamber 28.
  • Plate 30 may be removably secured to housing 27 by a plurality of fasteners, one of said fasteners being shown in FIG. 2 and identified by reference character 31.
  • a reservoir 32 Connected to the underside of plate 30 is a reservoir 32 defined by a bottom wall 33, side walls 34, 35 and front and rear walls 36, 37, respectively.
  • the reservoir may be secured to the underside of plate 30 by a number of fasteners (one fastener is shown in FIG. 2 and identified by numeral 38) received in threaded bores 39 formed in the reservoir.
  • the reservoir includes a raised bottom portion 33a at the front end thereof.
  • the reservoir also includes an upright, semi-circular wall 40 integral with raised bottom portion 33a. As noted in FIG. 2, the ends 40a of the wall do not contact front wall 36 of the reservoir. As will be explained hereinbelow, wall 40 defines a trap which comes into play when the tool illustrated is used for overhead operation.
  • Plate 31 includes an aperture 30a in which an internally threaded bushing or sleeve 41 is fixedly mounted.
  • a removable cap 42 is threadingly engaged in sleeve 41. Removal of cap 42 permits reservoir 32 to be filled with a quantity of oil.
  • Cap 42 contains vent means for venting reservoir 32 to atmosphere when the pressure therein is 3 less than atmospheric; this vent means will now be described.
  • the cap 42 includes a central stepped bore 42a in which a one way check valve 43 is mounted.
  • This valve may be a duckbill check valve of the type manufactured by Vernay Laboratories, Inc. It will be understood that this check valve permits air to be admitted into reservoir 32 from atmosphere but prevents an opposite flow of air.
  • the check valve 43 is sealed in the central bore in cap 42 by an O-ring 44. Seated on top of the O-ring is an air filter or screen 45, which screen is held in place by a split ring 46 received within an annular groove formed in bore 42a.
  • the forward end of the reservoir includes a through bore 48 in bottom portion 33a. This bore receives a reduced in diameter lower portion 49a of an oil absorbent member 49.
  • a sleeve-like filter 50 surrounds the upper or enlarged portion 49b of the oil absorbent member.
  • oil absorbent member 49 is formed of sintered or porous bronze metal and sleeve 50 is formed of a felt material. Filter 50 is of course not essential but merely preferred. Oil absorbent member 49 may also be formed of a felt or wicklike material for absorbing oil in the reservoir 32. At any rate, the member 49 must be formed of a material having interconnected openings or cells for absorbing oil and causing passage of the same from the reservoir to chamber 23 in which portion 49a of member 29 is disposed. Since member 49 is absorbent and formed of porous material, this member in effect communicates chamber 28 with reservoir 32, which reservoir is communicated with atmosphere by check valve 43 upon opening of the latter.
  • Reservoir 32 is substantially filled with a supply of oil.
  • the oil in the reservoir flows around the ends 40a of wall 40 (when the rotary-hammer is held in a position other than a position for overhead operation), passes through filter 50 and, after a relatively short period of time, becomes absorbed by member 49 throughout the entire length thereof.
  • piston 18 is reciprocated in cylinder which opens into chamber 28. Accordingly, piston 18 alternately forms high and low pressures in chamber 28.
  • the reservoir 32 is adapted to contain a suificient quantity of oil to permit operation of the tool for a considerable period of time without replenishing oil in the reservoir.
  • the present invention obviates known lubrication systems for power tools which generally include lubrication ports or fittings requiring the admission of oil at frequent intervals during operation of the tool.
  • a tool of the type including a housing having a cavity containing relatively movable, mechanically interconnected parts for reciprocating a piston in a cylinder which opens into said cavity, the improvement comprising, a hcusing plate secured to said housing and defining, with said cavity, a closed chamber, an oil reservoir mounted on the inside of said plate and thereby being disposed in said chamber, said plate including a normally closed one way check valve for venting said reservoir to atmosphere upon opening of said valve, which valve opens in response to a reduction in pressure in said reservoir, a member mounted with a portion thereof in said reservoir for being immersed in oil contained in the latter and with another portion thereof exposed to said chamber, which member has interconnected openings for absorbing oil and for communicating said chamber with said reservoir, whereby upon creation of low pressure in said chamber during movement of said piston in one direction said valve is opened and oil in said member is forced into the chamber for lubricating said parts therein, movement of said piston in the other direction serving to close said valve and thereby prevent escape of oil from said reservoir.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
US491930A 1965-10-01 1965-10-01 Lubricating system for power tools Expired - Lifetime US3367447A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US491930A US3367447A (en) 1965-10-01 1965-10-01 Lubricating system for power tools
GB41958/66A GB1158051A (en) 1965-10-01 1966-09-20 Lubricating System for Power Tools
NL6613658A NL6613658A (hr) 1965-10-01 1966-09-28
DE1503220A DE1503220C3 (de) 1965-10-01 1966-09-29 Öler für Schlagwerkzeuge
BE687643D BE687643A (hr) 1965-10-01 1966-09-30
CH1413766A CH442891A (de) 1965-10-01 1966-09-30 Handwerkzeug mit einer Schmiereinrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US491930A US3367447A (en) 1965-10-01 1965-10-01 Lubricating system for power tools

Publications (1)

Publication Number Publication Date
US3367447A true US3367447A (en) 1968-02-06

Family

ID=23954259

Family Applications (1)

Application Number Title Priority Date Filing Date
US491930A Expired - Lifetime US3367447A (en) 1965-10-01 1965-10-01 Lubricating system for power tools

Country Status (6)

Country Link
US (1) US3367447A (hr)
BE (1) BE687643A (hr)
CH (1) CH442891A (hr)
DE (1) DE1503220C3 (hr)
GB (1) GB1158051A (hr)
NL (1) NL6613658A (hr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523592A (en) * 1968-07-26 1970-08-11 Kohler Co Engine lubrication system
US4116505A (en) * 1976-10-22 1978-09-26 Fritz Stahlecker Bearing for a shaft of an open-end spinning rotor
EP0589337A1 (de) * 1992-09-24 1994-03-30 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohrhammer
US20110030983A1 (en) * 2009-08-05 2011-02-10 Makita Corporation Power tool
EP3098028A1 (de) * 2015-05-26 2016-11-30 HILTI Aktiengesellschaft Handwerkzeuggetriebeverschluss und handwerkzeugmaschine
EP3098029A1 (de) * 2015-05-26 2016-11-30 HILTI Aktiengesellschaft Handwerkzeuggetriebeverschluss und handwerkzeugmaschine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916508C2 (de) * 1979-04-24 1987-03-12 Friedrich Duss Maschinenfabrik GmbH & Co, 7265 Neubulach Von Hand führbarer, elektro-pneumatischer Bohrhammer
DE3320426C3 (de) * 1983-06-06 1998-03-26 Hilti Ag Belüftung für den Gehäuseraum eines Bohr- oder Meisselgerätes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011491A (en) * 1934-03-22 1935-08-13 Union Special Machine Co Sewing machine
US2150619A (en) * 1938-04-30 1939-03-14 Bonis Caesar Lubricating system for fur sewing machines
US3213966A (en) * 1965-04-06 1965-10-26 Bastian Blessing Co Lubricator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011491A (en) * 1934-03-22 1935-08-13 Union Special Machine Co Sewing machine
US2150619A (en) * 1938-04-30 1939-03-14 Bonis Caesar Lubricating system for fur sewing machines
US3213966A (en) * 1965-04-06 1965-10-26 Bastian Blessing Co Lubricator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523592A (en) * 1968-07-26 1970-08-11 Kohler Co Engine lubrication system
US4116505A (en) * 1976-10-22 1978-09-26 Fritz Stahlecker Bearing for a shaft of an open-end spinning rotor
EP0589337A1 (de) * 1992-09-24 1994-03-30 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohrhammer
US20110030983A1 (en) * 2009-08-05 2011-02-10 Makita Corporation Power tool
EP2281662A3 (en) * 2009-08-05 2012-07-25 Makita Corporation Power tool
US8360168B2 (en) 2009-08-05 2013-01-29 Makita Corporation Power tool
RU2543043C2 (ru) * 2009-08-05 2015-02-27 Макита Корпорейшн Электроинструмент
EP3098028A1 (de) * 2015-05-26 2016-11-30 HILTI Aktiengesellschaft Handwerkzeuggetriebeverschluss und handwerkzeugmaschine
EP3098029A1 (de) * 2015-05-26 2016-11-30 HILTI Aktiengesellschaft Handwerkzeuggetriebeverschluss und handwerkzeugmaschine

Also Published As

Publication number Publication date
GB1158051A (en) 1969-07-16
BE687643A (hr) 1967-03-30
DE1503220A1 (de) 1969-06-12
DE1503220B2 (de) 1974-04-04
CH442891A (de) 1967-08-31
NL6613658A (hr) 1967-04-03
DE1503220C3 (de) 1974-11-21

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