WO1995000288A1 - Fixation d'element d'outil a la broche filetee d'un outil a moteur - Google Patents

Fixation d'element d'outil a la broche filetee d'un outil a moteur Download PDF

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Publication number
WO1995000288A1
WO1995000288A1 PCT/AU1994/000349 AU9400349W WO9500288A1 WO 1995000288 A1 WO1995000288 A1 WO 1995000288A1 AU 9400349 W AU9400349 W AU 9400349W WO 9500288 A1 WO9500288 A1 WO 9500288A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
tool
washer
shoulder
bearing
Prior art date
Application number
PCT/AU1994/000349
Other languages
English (en)
Inventor
Norman Leslie Matthews
Original Assignee
Norman Leslie Matthews
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 Norman Leslie Matthews filed Critical Norman Leslie Matthews
Priority to AU70627/94A priority Critical patent/AU7062794A/en
Publication of WO1995000288A1 publication Critical patent/WO1995000288A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/26—Securing milling cutters to the driving spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

  • This invention relates to means for attaching blades, discs, chucks and other tool- elements to the threaded spindles of power tools. More particularly, the invention is concerned with power tool spindles for use in driving rotary tool-elements and to power tool assemblies comprising such spindles and tool elements in combination.
  • the spindle-side of the tool element will be referred to as the back of or the rear and the nut or bolt side will be referred to as the front or the forward side.
  • a tool element is usually attached to a power-tool spindle by a screw-threaded nut or bolt, the hand of the thread being such that the rotation of the spindle tends to tighten the nut or bolt.
  • a tool element such as a saw- blade or grinder-disc — with substantial inertia is mounted on the spindle of a powerful tool in this manner, it will slip on the spindle upon start-up and carry the nut or bolt with it causing it to tighten further by 'spin-up'.
  • the spindle will slip in the element and tend to further 'jam-tighten' the nut or bolt.
  • US patent 5,152,106 to MacKay discloses a light-use cut-off wheel having a threaded hub for screwing onto a short shank that is adapted to be held in the chuck or collet of a small power tool.
  • the rear face of the cut-off wheel is tightened against a cup-like backing flange that is, in turn, supported against a shoulder on the shank.
  • the front face of the backing flange is coated or lined with plastics material so that said material is interposed between the rim of the backing flange and the rear face of the cut-off wheel. It is said that, with the use of such dissimilar materials, the cut of wheel is easily removed from the shank without the need for tools.
  • This invention is based upon the realisation that, if a low-friction thrust bearing (eg, of the type disclosed in my prior application) is arranged behind the tool-element and and against the spindle shoulder, it would be possible to repeatedly replace the tool- elements of heavy-duty power-tools with ease and without the need for separate nuts and tools. Further, if the thrust bearing incorporated a solid plastic lubricant such as PTFE, it could easily be arranged so that this material is not cut or abraded by the rough surface of the tool-element. The thrust bearing may be conveniently retained on the spindle when the tool-element is removed so that it will not be lost and so that dust and grit are excluded from the bearing surfaces.
  • a low-friction thrust bearing eg, of the type disclosed in my prior application
  • the low-friction element of the thrust bearing has an outer diameter which is comparable to that of the spindle, though it is envisaged that the bearing may include a cup-like pressure plate which acts to spread the clamping force over a larger diameter of the tool element.
  • the invention comprises a power tool spindle for driving a rotary tool-element that is axially clamped by self-tightening screw-thread means against a shoulder formed on or near the forward end of the spindle, wherein a low- friction thrust-bearing is located on the spindle forward of said shoulder for transmitting the axial clamping force applied by the screw-thread means between the tool element and the shoulder.
  • the low-friction element of the thrust bearing comprises a PTFE washer
  • the PTFE washer may be located in the annular groove of one or more cup washers.
  • roller, ball or greased-plate thrust bearings may be employed instead of a PTFE washer.
  • the distal or front end of the spindle will carry an external (male) thread adapted to engage an internally threaded nut or socket in the tool-element.
  • the threaded nut will normally form its centre or hub and be fixedly secured to the disc or blade.
  • the spindle may carry the threaded socket and the tool-element may carry the threaded stud or bolt. It is also envisaged that the nut or bolt of the tool-element may be separate from the tool-element itself, as in conventional power grinders and saws.
  • the thrust bearing may be housed by or in the hub of the tool element and discarded with that element after its useful life has been expended.
  • a PTFE washer may be fitted to the rear face of the hub of a grinder disc so as to bear against the spindle shoulder.
  • the invention comprises power tool spindles, power tools and tool element assemblies and novel tool elements fitted with thrust bearings.
  • Figure 1 is a sectional elevation of part of a power tool spindle fitted with a cut- off wheel or saw blade comprising the first example of this invention.
  • Figures 1 A is an enlarged sectional elevation of one form of thrust bearing suitable for with the spindle and tool-element assembly of Figure 1.
  • Figure 1 B is a sectional elevation of the spindle and tool-element assembly of
  • FIG. 1 showing an alternative form of thrust bearing.
  • Figure 2 is a sectional elevation of part of a power tool spindle fitted with a cut ⁇ off wheel or saw blade comprising the second example of this invention.
  • Figure 3 is a sectional elevation of part of a power tool spindle fitted with a cut ⁇ off wheel or saw blade comprising the third example of this invention.
  • Figure 4A is a plan view of part of the spindle and tool element assembly which comprises the fourth example of this invention.
  • Figure 4B is a sectional elevation of the spindle and tool assembly of Figure 4A.
  • Figure 5 is a sectional elevation of part of a power tool spindle fitted with a grinding disc and comprises the fifth example of this invention.
  • the tool-element 10 comprises a cut-off disc or saw-blade 12 with a central hub-nut 14 bonded or swaged in a central bore 16 of the disc or blade 12.
  • hub-nut 14 is threaded onto the threaded stub 18 of the spindle 20 of a power tool (not shown).
  • a radial shoulder 22 is formed on spindle 20 and carries an annular thrust bearing 24 on its front face 26, bearing 24 being retained in place on spindle 20 by snap-ring 28 fitted in groove near the rear or inner end of threaded stub 18.
  • tool element 10 is manually threaded onto stub 18 of spindle 20 and tightened by hand (without tools) against bearing 24.
  • some further spin-up tightening of element 10 on stud 18 is likely to occur and, during heavy use, some further jam-tightening of hub-nut 14 on stub 18 can also be expected.
  • This will result in some resilient extension of the stud material and some resilient compression of the hub and thrust-bearing materials, the degree of extension and compression being dependent upon the torque applied and the screw- thread friction.
  • thrust bearing 24 can take many forms; for example, a needle or roller bearing, greased metal plates or a PTFE-washer bearing. The latter is preferred because it offers the lowest resistance to movement after a long period of heavy static loading. Teflon or PTFE washers, however, can be extruded under heavy loads and high temperatures and it is therefore preferable (as disclosed in my prior patent applications) to, first, employ a filled or reinforced PTFE material which resists extrusion and, second, peripherally confine the PTFE washer against lateral movement.
  • Figure 1 A shows (enlarged) one form of PTFE thrust bearing 24a found to be suitable. It simply consists of a PTFE washer 30 sandwiched between upper and lower metal pressure rings 32 and 34.
  • each pressure ring is recessed to accommodate the washer 30 and to restrict its lateral extrusion.
  • the recess in each pressure ring may be of wedge-shape cross-section so that (after initial assembly and pre-loading) the pressure rings are held together by the distortion of the PTFE washer.
  • a thrust bearing of this design is simple, cheap and effectively self-sealed against the ingress of dirt, grit and moisture.
  • FIG. 1 B Another form of thrust-bearing (24b) which is even simpler, but is not self-sealing, is shown in Figure 1 B.
  • Only one grooved pressure plate 36 is provided, the PTFE washer 38 being fitted within its groove so that its exposed (rear) face bears against the front or outer face of spindle shoulder 22.
  • bearing 24b can be reversed so that the exposed face of PTFE washer 38 bears against the rear face of hub-nut 14.
  • the other parts of the spindle 20 and the tool-element 10 are also shown and are identical to those of Figure 1 , and are numbered accordingly.
  • the tool element 40 again comprises a cut-off wheel or saw-blade 42 permanently fitted with a threaded nut-hub 44 which is again engaged with the threaded stub 46 of spindle 48.
  • a radial collar or shoulder 50 is formed on spindle 48 against which hub-nut 44 is tightened.
  • the thrust bearing is formed by fitting a PTFE washer 52 into an annular recess formed in the front face of shoulder 50, the exposed front face of washer 52 being engaged by an annular ridge 54 on the rear face of hub-nut 44.
  • ridge 54, washer 52 and the shoulder groove together constitute the thrust bearing.
  • the inner or rear radial face of hub-nut 64 is annularly grooved to take PTFE washer 72 and the front or outer radial face of spindle shoulder 70 has an annular ridge 74 formed thereon to engage with washer 72.
  • tool element 80 again comprises a cut-off disc or saw-blade 82 with a hub 84 fixed in the centre thereof.
  • the inner or rear face of hub 84 carries an annular projec ⁇ tion/bearing face 86 which engages the front face of a PTFE washer 88 located within an annular groove 90 formed in the front face of spindle shoulder 91.
  • hub 84 is slotted with four equidistant grooves or slots 92 which take the corresponding external splines 94 of a threaded nut 96 that is threaded onto spindle stub 98.
  • Nut 96 can capture hub 84 (if desired) by turning-over a lip 99 on its outer periphery, so that the nut, hub and disc or blade are purchased, used and disposed of as an assembly.
  • the nut is not formed to capture the hub, only the hub and blade/disc need be purchased as a unit and the nut may be removed, retained and reused with new blades or discs.
  • the use of the spline connection between the nut and the hub of the fourth example allows the bearing face 86 of hub 84 to align itself with groove 90 even where there may be slight eccentricities between the groove 90, stub 98 and nut 96. This feature reduces the danger of frictional binding between the edges of groove 90 and bearing face 86.
  • the fifth and final example of the invention is illustrated in Figure 5 and involves the use of a conventional grinder disc, a separate nut and a pressed steel backing plate with a thrust bearing. Referring to the Figure, the dished grinding disc 100 is secured by a nut 102 to the threaded stud 104 of spindle 106 which carries a shoulder 108 that supports a thrust bearing 110.
  • nut 102 does not form a fixed hub of disc 100, disc 100 cannot be tightened onto spindle 104 by engaging the inner face of nut 102 with bearing 110. Instead, a separate, cup-like, pressed- steel backing-plate 112 is used to convey the clamping pressure applied to disc 100 by nut 102 to spindle shoulder 108 (via bearing 110).
  • the use of such " backing plates is conventional in the art.
  • the bearing 110 of this example may take any desired form, including any one of those indicated above.
  • a separate bearing assembly may be employed (as illustrated); a PTFE washer may be located on the outer face of shoulder 108 (within a recess if desired) and the inner rear face of backing plate 112 may be engaged directly with the washer; or, the said face of backing plate 112 may be coated with PTFE, or recessed to take a PTFE washer.
  • the backing plate can be retained on the spindle (as part of the bearing) by the use of a snap-ring (as indicated above) or it may be separable and replaceable.
  • this invention embraces power tools and their rotary tool-elements modified and improved as indicated, the power tools and tool-elements indicated being used or sold in combination or as independent products.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Gripping On Spindles (AREA)

Abstract

Ensemble constitué d'une broche à outil à moteur et d'un outil, qui permet à cet outil (10) d'être vissé et serré sur un goujon (18), avant d'être retiré après usage sans recourir à aucun outil. L'outil (10) consiste en une lame de scie ou un disque de coupe (12) pourvu d'un moyeu à filetage interne (14) qui s'engage sur la partie filetée (18) de la broche (20). La broche comporte, en arrière du goujon fileté (18), un épaulement (22), tandis qu'un palier de butée (24) est positionné entre le moyeu (14) et l'épaulement (22) afin d'absorber la charge de serrage dans le sens axial lorsque l'outil (10) est serré sur la broche. Le palier de butée permet le retrait immédiat de l'outil même lorsque ce dernier a pu subir un auto-serrage sur la broche sous l'effet de la rotation ou d'une lourde charge.
PCT/AU1994/000349 1993-06-24 1994-06-24 Fixation d'element d'outil a la broche filetee d'un outil a moteur WO1995000288A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU70627/94A AU7062794A (en) 1993-06-24 1994-06-24 Tool element attachment to threaded power tool spindle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL956893 1993-06-24
AUPL9568 1993-06-24

Publications (1)

Publication Number Publication Date
WO1995000288A1 true WO1995000288A1 (fr) 1995-01-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1994/000349 WO1995000288A1 (fr) 1993-06-24 1994-06-24 Fixation d'element d'outil a la broche filetee d'un outil a moteur

Country Status (1)

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WO (1) WO1995000288A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1097497C (zh) * 1997-06-25 2003-01-01 伊莱克斯公司 驱动轮
US6702090B2 (en) 2001-03-14 2004-03-09 Milwaukee Electric Tool Corporation Power tool and spindle lock system
US7063201B2 (en) 2001-11-27 2006-06-20 Milwaukee Electric Tool Corporation Power tool and spindle lock system
US20140182442A1 (en) * 2012-12-31 2014-07-03 Robert Bosch Gmbh Tool-Free Blade Change System
WO2015075001A1 (fr) * 2013-11-25 2015-05-28 Robert Bosch Gmbh Système de boulon sans outil pour une lame de scie
CN111702256A (zh) * 2019-03-18 2020-09-25 罗伯特·博世有限公司 用于附件工具的轴承单元
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH515778A (fr) * 1970-10-14 1971-11-30 Genevoise Instr Physique Dispositif d'entraînement de l'outil par la broche d'une machine-outil
DE2302033A1 (de) * 1970-11-12 1974-07-25 Lars Johanson Werkzeughalterung
DE3942806A1 (de) * 1989-12-23 1991-06-27 Metabowerke Kg Rutschkupplung zur begrenzung des maximalen drehmoments eines elektrowerkzeugs
WO1992004549A1 (fr) * 1990-09-12 1992-03-19 Norman Leslie Matthews Dispositif de fixation
GB2252061A (en) * 1991-01-28 1992-07-29 Bosch Gmbh Robert Powered hand tool with quick-acting tool clamping device
US5152106A (en) * 1986-04-03 1992-10-06 Mackay Joseph H Jun Cut-off wheel having disposable mounting hub
EP0558277A1 (fr) * 1992-02-28 1993-09-01 Black & Decker Inc. Amélioration de ou en rapport avec le bloquage de flasques
AT396888B (de) * 1989-12-14 1993-12-27 Fuerlinger Friedrich Vorrichtung zum festspannen eines scheibenförmigen werkzeuges, insbesondere einer schleifscheibe
EP0588483A2 (fr) * 1992-08-31 1994-03-23 Daijiro Nakamura Vis de serrage

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH515778A (fr) * 1970-10-14 1971-11-30 Genevoise Instr Physique Dispositif d'entraînement de l'outil par la broche d'une machine-outil
DE2302033A1 (de) * 1970-11-12 1974-07-25 Lars Johanson Werkzeughalterung
US5152106A (en) * 1986-04-03 1992-10-06 Mackay Joseph H Jun Cut-off wheel having disposable mounting hub
AT396888B (de) * 1989-12-14 1993-12-27 Fuerlinger Friedrich Vorrichtung zum festspannen eines scheibenförmigen werkzeuges, insbesondere einer schleifscheibe
DE3942806A1 (de) * 1989-12-23 1991-06-27 Metabowerke Kg Rutschkupplung zur begrenzung des maximalen drehmoments eines elektrowerkzeugs
WO1992004549A1 (fr) * 1990-09-12 1992-03-19 Norman Leslie Matthews Dispositif de fixation
GB2252061A (en) * 1991-01-28 1992-07-29 Bosch Gmbh Robert Powered hand tool with quick-acting tool clamping device
EP0558277A1 (fr) * 1992-02-28 1993-09-01 Black & Decker Inc. Amélioration de ou en rapport avec le bloquage de flasques
EP0588483A2 (fr) * 1992-08-31 1994-03-23 Daijiro Nakamura Vis de serrage

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1097497C (zh) * 1997-06-25 2003-01-01 伊莱克斯公司 驱动轮
US6702090B2 (en) 2001-03-14 2004-03-09 Milwaukee Electric Tool Corporation Power tool and spindle lock system
US7063201B2 (en) 2001-11-27 2006-06-20 Milwaukee Electric Tool Corporation Power tool and spindle lock system
US20140182442A1 (en) * 2012-12-31 2014-07-03 Robert Bosch Gmbh Tool-Free Blade Change System
US9636763B2 (en) * 2012-12-31 2017-05-02 Robert Bosch Tool Corporation Tool-free blade change system
WO2015075001A1 (fr) * 2013-11-25 2015-05-28 Robert Bosch Gmbh Système de boulon sans outil pour une lame de scie
CN105916647A (zh) * 2013-11-25 2016-08-31 罗伯特·博世有限公司 用于锯片的免工具螺栓系统
US10549449B2 (en) 2013-11-25 2020-02-04 Robert Bosch Gmbh Tool free bolt system for a saw blade
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
CN111702256A (zh) * 2019-03-18 2020-09-25 罗伯特·博世有限公司 用于附件工具的轴承单元
US11204061B2 (en) * 2019-03-18 2021-12-21 Robert Bosch Gmbh Bearing unit for an accessory tool

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