US3884094A - Rotary tool guard - Google Patents
Rotary tool guard Download PDFInfo
- Publication number
- US3884094A US3884094A US472835A US47283574A US3884094A US 3884094 A US3884094 A US 3884094A US 472835 A US472835 A US 472835A US 47283574 A US47283574 A US 47283574A US 3884094 A US3884094 A US 3884094A
- Authority
- US
- United States
- Prior art keywords
- spindle
- guard member
- guard
- invention according
- rotary tool
- 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
Links
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 239000012858 resilient material Substances 0.000 claims description 5
- 239000011343 solid material Substances 0.000 claims description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229920002160 Celluloid Polymers 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Images
Classifications
-
- 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
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P1/00—Safety devices independent of the control and operation of any machine
- F16P1/04—Screens or hoods rotating with rotary shafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/08—Protective coverings for parts of machine tools; Splash guards
-
- 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
- Y10T74/219—Guards
- Y10T74/2191—Guards for rotary member
Definitions
- ABSTRACT [52 us. (:1. 1. 74/609- 144/134 A' 144/251 A- A "nary guard and mm Particularly a Shape 144/253 guard, including a disc-shaped guard member having a 51 Int. Cl. .1 Fl6p 1/00 bearing member matably mmmed the [58] Field of Search- 4 5, 144/251 A 253 J spindle above the rotary tool for rotary movement in- 144/134 134 dependently of the tool.
- the rotary tool guard may also be provided with [56] References Cited means for holding the guard member stationary, even UNITED STATES PATENTS while the spindle iS rotating.
- This invention relates to a rotary tool guard, and more particularly to a shaper guard.
- shaper guards have been of various designs, primarily ring-shaped, and mounted above the rotary shaper tool by a standard or bracket fixed to the shaper table at a laterally remote position from the shaper tool spindle.
- Cylindrical shaped guards for rotary cutter heads which are fixed to the spindle above the cutter head are also known, as illustrated in US. Pat. No. 337,493, issued to Hall on Mar. 9, 1886.
- Disc-shaped shaper guards which are fixed to the spindle of the shaper tool and which are provided with openings through the guard for visibility, are disclosed in US Pat. No. 828,706, issued to Bohling, et al., on Aug. 14, 1906, and in US. Pat. No. 955,482 issued to Stewart on Apr. 19, 1910.
- the Stewart shaper guard is provided with a transparent celluloid material.
- a preferred form of shaper guard includes a solid annular body having an opening coaxially through the center thereof for fitting over the upper part of the spindle above the rotary tool.
- a bearing means or member including an outer race fixed to the inner portion of the guard member and an inner race adapted to be fixed to the spindle, with a bearing or bearings supported between the inner and the outer race to permit rotary independent movement of the guard relative to the spindle.
- the purpose of having a bearing mounting for the guard upon the spindle is normally to permit the shaper guard to rotate, but at a slower speed than the very rapid angular velocity of the shaper spindle.
- the shaper guard mounted upon the spindle by bearings might travel at approximately 3,500 RPM, which is sufficiently rapid to dis courage the operator from removing the guard from the spindle, yet not so rapid as to injure an operator who night inadvertently come in contact with the rapidly spinning shaper guard.
- the reason that the shaper guard rotates at all is of course, because of the friction between the outer race, bearing members and inner race which tend to drag the shaper guard in' the same rotary direction as the driven spindle.
- the guard member may be held stationary by any appropriate means such as a stop element engaging the rim of the guard, or a locking pin extending through mating apertures in the guard and the stationary platform below the guard.
- the bearing members still permit the rapid rotation of the spindle and the shaper tool.
- the discshaped guard member has its annular major body portion continuously transparent to permit constant visibility of the work beneath the guard by the operator, regardless of the position of the guard.
- Another object of this invention is to provide a shaper guard which has no mounting portions or brackets projecting laterally beyond the periphery of the guard itself.
- the rim of the disc-shaped guard member is surrounded and completely covered by a soft resilient material, such as rubber or polyurethane.
- FIG. 1 is a top perspective view of the guard, made in accordance with this invention, mounted upon the spindle of a shaper tool, with portions of the shaper table and fence shown fragmentarily;
- FIG. 2 is an enlarged, fragmentary, section taken along the line 22 of FIG. 1;
- FIG. 3 is a fragmentary section taken along the line 33 of FIG. 1, with a portion of the guard in section.
- the shaper machine 10 includes a table 11, shown fragmentarily and a pair of opposed fence elements 12 and 13 adapted to be longitudinally adjusted toward and away from each other.
- the fence elements 12 and 13 may be locked in adjusted positions against the rigid brackets 14 by the threaded clamping elements 15.
- a vertical spindle 18 Projecting upward through an opening 17 in the table 11 is a vertical spindle 18 which is rotatably driven about its vertical axis by a motor and transmission, not
- a shaper tool 20 having blades 21 of the desired configuration for forming or shaping a wooden piece of work fed over the top of the table 11 for cutting engagement with the shaper blades 21.
- the fence elements 12 and 13, of course, are employed to guide the work as it is shaped.
- the shaper blades 21 are fixed upon the lower portion of the upper section 22 of the spindle 18, the upper section 22 being that part of the spindle 18 which projects above the hole 17 in the table 11.
- the upper spindle section 22 is adapted to project above the shaper blades 21, and is also preferably threaded, as shown.
- the rotary tool guard or shaper guard 25 is discshaped and provided with a hole or opening 26 in the center thereof to fit over the upper spindle section 22.
- the tool guard or guard member 25 is mounted upon the upper spindle section 22 by a bearing member 27, including an annular outer race 28 fixed to the guard member 25 against the opening 26, and an annular inner race 29 having an internally threaded opening adapted to threadedly engage the upper spindle section 22.
- a bearing member 27 including an annular outer race 28 fixed to the guard member 25 against the opening 26, and an annular inner race 29 having an internally threaded opening adapted to threadedly engage the upper spindle section 22.
- the outer race 28 and the inner race 29 are one or more bearings, such as the plurality of ball bearings 30, permitting independent rotation of the outer race 28 and the inner race 29. Accordingly, the shaper guard or guard member 25 is rotatable independently of the spindle 18.
- the major portion of the guard member 25 is an annular body portion 32, preferably solid, and also preferably of transparent material, such as a transparent acrylic resin, for example Plexiglass.
- a groove 33 is formed circumferentially around the periphery of the annular body portion 32 to receive the annular rib 34 of the annular rim 35 of the guard member 25.
- the annular rim 35 is made of a soft resilient material, such as rubber or polyurethane, for protection of the operator against accidental contact with the periphery of the guard member 25, while it is rotating.
- the bottom surface of the inner race 29 is separated from the shaper tool by a washer or spacer 37 around the spindle section 22.
- the spacer 37 also provides a surface against which the inner race 29 is forced and held in clamped position by a nut member 38.
- the nut member 38 threadedly engages the upper spindle section 22 and is tightened down upon an upper spacer 39, which forces the inner race 29 against the spacer 37.
- the upper and lower spacers 39 and 37 are of slightly lesser diameter than the inner race 29, so as not to interfere with the independent rotation of the body member 32.
- a guard washer 40 having a larger diameter than the hole 26, is coaxially fitted upon the spindle section 22 between the nut 38 and the upper spacer 39 to prevent the body portion 32 from accidentally flying off the outer race 28.
- the guard member may be vertically adjusted upon the upper spindle section 22 by rotating the inner race in threaded engagement with the upper spindle section 22, and by inserting spacers 37 of different thicknesses.
- the shaper tool 20, as well as the inner race 29, rotates at the same speed as the driven spindle 18, by virtue of these parts being fixed to the spindle 18. Because of the frictional engagement between the ball bearings and the respective inner race 29 and outer race 28, the shaper guard member 25 will also be dragged along in the same rotary direction of the spindle 18, but at a much reduced speed, depending upon the degree of friction between the ball bearings 30 and the inner race 29 and outer race 28. Even so, the annular velocity of the shaper guard 25, even though less than the high annular velocity of the spindle 18, will still be sufficiently great to discourage an operator from voluntarily touching or grasping the shaper guard member 25.
- the body portion 32 is transparent, the operator will still have maximum visibility through the continuously transparent body portion 32, even though the guard member 25 rotates rapidly and continuously. Since the transparent body portion 32 is completely annular and of uniform radial dimensions, visibility through the guard member 25 is uniform and continuous regardless of the rotational position or rotational speed of the guard member 25.
- the threaded clamping elements 15 may be loosened, while the shaper guard member 25 is rotating, and one or the other, or both, of the fence elements 12 and 13 may be urged radially inward to engage the periphery of the rim 35. Moreover, the fence elements 12 and 13 may be urged inwardly into engagement with the rim 35, even before rotation of the spindle 18 is begun.
- the locking pin 45 which may be urged downward through an opening 46 of corresponding size, completely vertically through the thickness of the annular body portion 32, and down into a mating aperture 47 through the table 1 1, as best disclosed in FIGS. 1 and 3.
- a guard for a rotary tool apparatus having a platform, a vertical spindle projecting above said platform and rotatably driven about its vertical axis, and a rotary tool fixed to the portion of the spindle adjacent and above said platform for operating upon work upon said platform in engagement with said tool, comprising:
- a disc-shaped guard member having a diameter greater than the maximum diameter of the swath of said rotary tool
- bearing means rotatably mounting said guard member coaxially upon said spindle above said rotary tool, whereby said guard member may rotate independently of said spindle.
- said guard member has an opening through the center thereof, said bearing means comprising an outer race fixed to said guard member coaxially within said opening, said bearing means further comprising an inner race within said outer race and means fixing said inner race to said spindle, and at least one bearing member between said inner and outer races to permit independent rotation between said inner and outer races.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
Description
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US472835A US3884094A (en) | 1974-05-23 | 1974-05-23 | Rotary tool guard |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US472835A US3884094A (en) | 1974-05-23 | 1974-05-23 | Rotary tool guard |
Publications (1)
Publication Number | Publication Date |
---|---|
US3884094A true US3884094A (en) | 1975-05-20 |
Family
ID=23877120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US472835A Expired - Lifetime US3884094A (en) | 1974-05-23 | 1974-05-23 | Rotary tool guard |
Country Status (1)
Country | Link |
---|---|
US (1) | US3884094A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5117880A (en) * | 1990-10-16 | 1992-06-02 | Delta International Machinery Corporation | Shield for cutting blade |
US5188011A (en) * | 1991-06-17 | 1993-02-23 | Berkel Incorporated | Temporary cover for the slicing knife of a slicing machine |
US6520225B1 (en) * | 2002-01-25 | 2003-02-18 | Andrews Toolworks, Inc. | Guide for a tool |
US20030205292A1 (en) * | 2002-05-02 | 2003-11-06 | Smith Darrin Eugene | Gauge for measuring movement of a power tool & dust collector for work bench |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US955482A (en) * | 1909-03-31 | 1910-04-19 | Walter G Stewart | Shaper-guard. |
US1947885A (en) * | 1933-06-19 | 1934-02-20 | Delta Mfg Co | Work guide |
-
1974
- 1974-05-23 US US472835A patent/US3884094A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US955482A (en) * | 1909-03-31 | 1910-04-19 | Walter G Stewart | Shaper-guard. |
US1947885A (en) * | 1933-06-19 | 1934-02-20 | Delta Mfg Co | Work guide |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5117880A (en) * | 1990-10-16 | 1992-06-02 | Delta International Machinery Corporation | Shield for cutting blade |
US5188011A (en) * | 1991-06-17 | 1993-02-23 | Berkel Incorporated | Temporary cover for the slicing knife of a slicing machine |
US6520225B1 (en) * | 2002-01-25 | 2003-02-18 | Andrews Toolworks, Inc. | Guide for a tool |
US20030205292A1 (en) * | 2002-05-02 | 2003-11-06 | Smith Darrin Eugene | Gauge for measuring movement of a power tool & dust collector for work bench |
US6966122B2 (en) * | 2002-05-02 | 2005-11-22 | Darrin Eugene Smith | Gauge for measuring movement of a power tool and dust collector for work bench |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: COMMERCE UNION BANK, ONE COMMERCE PLACE, NASHVILLE Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:FEDERAL SAFETY PRODUCTS, INC., A CORP. OF TE;REEL/FRAME:003917/0311 Effective date: 19811007 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
|
AS | Assignment |
Owner name: FEDERAL SAFETY PRODUCTS, INC., 345 AIRPORT ROAD, G Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ULMER, JAMIE F.;REEL/FRAME:004664/0455 Effective date: 19861224 |
|
AS | Assignment |
Owner name: FEDERAL SAFETY PRODUCTS, INC., HENDERSONVILLE, TN. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:COMMERCE UNION BANK,;REEL/FRAME:004669/0755 Effective date: 19870212 Owner name: FEDERAL SAFETY PRODUCTS, INC., A CORP. OF TN.,TENN Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:COMMERCE UNION BANK,;REEL/FRAME:004669/0755 Effective date: 19870212 |
|
AS | Assignment |
Owner name: DELTA INTERNATIONAL MACHINERY CORP. 246 ALPHA DRIV Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FEDERAL SAFETY PRODUCTS, INC., HENDERSONVILLE, TN, A CORP. OF O;REEL/FRAME:004727/0199 Effective date: 19870508 Owner name: DELTA INTERNATIONAL MACHINERY CORP., A MINNESOTA C Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FEDERAL SAFETY PRODUCTS, INC., HENDERSONVILLE, TN, A CORP. OF O;REEL/FRAME:004727/0199 Effective date: 19870508 |