US1052073A

US1052073A - Drill-grinding attachment for abrading-wheels.

Info

Publication number: US1052073A
Application number: US61639411A
Authority: US
Inventors: Bonnie L Mallory
Original assignee: FRED C ELLASSER
Current assignee: FRED C ELLASSER
Priority date: 1911-03-23
Filing date: 1911-03-23
Publication date: 1913-02-04
Anticipated expiration: 1930-02-04

Description

B. L. MALLORY. DRILL GEINDING ATTACHMENT PoE ABEADING WHEELS.

APPLIOATION FILED MAB. 23. 1911.

Z SHEETS-SHEET 1.

(2 L a. MW@ "j Patented Feb. 4.1913.

B. L. MALLORY. DRILL GBINDING ATTACHMENT FOB. ABRADING WHEELS. APPLIOATION FILED 11.111. 2a. 1911.

1,052,073. Patented Feb. 4, 1913.

2 SHEETS-SHEET 2.

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ATTI/ VUNrrED STATES vPAiii-intl: orEroE.

BONNIE L. MALLORY, br CLEVELAND, omo, AssrGNort or 'ONE-THIRD rro .FRED c. ELLAssER, or CLEVELAND, oHro.

DRILL-GRINDING ATTACHMENT Foa ABEApING-WHEELS.

speciacatibn er Letters Patent.

Patented Feb. 4,1913.

Application filed March 23, 1911. Serial No. 616,394.

To all whom it mayconcem:

Be it known that I, BONNIE L. MALLORY, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Improvement in Drill-Grinding Attachments for Abrading-Wheels, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings.

This invention relates to drill-grinding attachments for emery wheels, the same having for its object, generally stated, the production of` a device that is adapted to hold and guide the drill upon the convex or rounded surface of the emery wheel.

Further-objects of this invention are the production of a device ofthe character stated in which the drill holding attachments are so mounted and operated as to lproducethe'proper clearance at the rear of the cutting edges of the drill; in which'the drill may be conveniently placed for grindwhich .proper adjustments Amay be conveniently made for the sizes and lengths of drills, and in which the parts are so constructed as to be capable of Iconvenient operation and economical manufacture.

Qne structure in which the above'stated and other objects are attained is shown in the accompanying drawings, in which- Figure 1 shows a portion of the wheel in side elevation with the grinding attachment applied thereto; Fig.,2 is a plan view of what is shown in Fig. 1, the upper parts4 of the holding rings for the grinding attachment being broken away; Fig. 3 is a view of the front of the attachment, or of the attachment as. viewed from the emery wheel; Fig. 4 is a sectional view take-n on the linev 4-4 of Fig. -2, and Fig. 5 is a perspective view of parts of the grinding attachment, some of said partsbeing removed' from their normal or assembled positions in order that they may be better illustrated.

Taking up a detailed description of the invent-ion and employing the referencecharacters foundV on the drawings, 1 represents an abrading wheel, which maybe made of emery or any other suitable material, said wheel being supported upon suitable frame pieces 2,that are secured on a support 3 of any desired character. Upon this same support, and in Jfront of the convex edge of the mately sixty degrees.

wheel, is the support for the grinding attachment, said support being shown as a socket member 4, although it -may be of any other suitable character. A

Extending within the socket member 4, and held therein by a set screw 5, is theL stem 6 of ,the outer supporting ring 7 of the at tachment. This ringis perfectly circular, and is providedwith

ring plates

8 and 9 that are secured to its sides and that 'project incoA wardly beyond the ring so as tol form a channel for confining a pair of

half rings

10 and 11, said latterrings being, in effect, a single ring that is divided for convenience in assembling only. Thel divided ring fits within the said channel with suiiicient looseness to permit it to turn freely within the main ring 7. As `appears from Fig. 3, the division line between the

ring Sections

10 and 11 is vertical and passes through the center of curvature of the main ring. At substantially their mid-points, the ring scctions are provided with holes 12, in which are journaled the trunnioned ends 13 of a rocking cradle 14, the latter having `a-depending web 15 that preferably lies inthe samevertical plane as `the trunnions and has its lower edge curved concentrically with the main ring 7 This cradle also has what may be termed a trough portion 16, the same.

projecting beyond each side ofthe web and having its axis inclined with respect to the axis of the web at an angle of approxiis a V-block 17, the lower surface of which is preferably flat, while the upper surface is provided with a V-shaped groove. This blockl rests upon the upper end of one or more screws 18, by means of which the block may be raised or lowered in the trough, for a purpose hereinafter stated. -For guiding the block within the trough, the walls of both are grooved, the grooves of the trough being shown at 19 and those in the block being shown at 20. When the arts are assembled, these grooves register and form verticalA seats for guide pins 2,1, see Fig. 4, said pins being partly inthe trough and partly in the block. At the front end of the (trough 16 I secure a gage 22, the same projecting in the direction of the emery wheel,

and then turning across the. rounded face of the latter, said gagev being for the purpose of correctly positioning the drill, the latter be- Within this trough indicated at 23. When thus positioned, the block is raised or lowered, depending upon the manner in whichy it is already lset and the size of the drill to be ground, until the gage engages one of the lutesof the drill, when the latter is in position vfor grinding. For forcing the drill against the emery wheel, I mount a set-screw 24 in an adjustable post 25 in such a manner that it may be screwed against the end of the drill shank, the post being slidably mounted on an arm 26 that projects from the trough 16 and being held in its adjusted positions by a set screw 27.

As is shown in Fig. 2, the drill 1s presented to the wheel at an angle of about thirty degrees from the normal at the'point of application. If the drill were simply turned on its own axis, it would be ground to a point, but there would be no clearance provided at the rear ofthe cutting edges, such clearance being necessary to the cutting action o1 the drill. If, on the other hand, the drill were held against rotation and were simply moved up and down by rocking the cradle 14, some clearance would be provided near the cutting edge, but the drill more remote from such edge would not be sufficiently ground. It therefore becomes necessary to give the drill both a rotary and a rocking movement in order to grind the same in the form of a spiral which recedes from the cutting edge, this being the best shape to grind the drill, since it cuts its way into the metal in a spiral direction. In order to give the drill this double movement, I provide means for rotating or oscillating the cradle while it is being rocked on its trunnions 13. This means consists of a guide 28 that extends across the lower part of the ring 7 at an angle of approximately twenty degrees, the same being secured, through its depending lugs 29, to bosses 30 on the stem 6 of the attachment. The upper surface of the guide 28 is preferably curved, with thea-'iris of the cradle as a center, and the web" of the lat-ter is provided with a notch 31 into which the guide extends.

As will be seen by reference to Fig.,1, the

trunnions 13 are positioned slight-ly abovey the center of the wheel 1. When the cradle is in its normal position, as shown in said figure, the line of contact between the drill and the wheel is substantially in the common plane of the trunnion and the wheel axis. For accurately adjusting the cradle, a lug 32 is provided on the guide 28, and a set screw 33 is projected through the lug into position to engage the cradle and thus limit the downward movement of the drill at the cutting line. For holding the cradle in normal position, a spring 34 is coiled about the axis of the cradle, oneend of the same being attached to said axis and the noname other end to the adjacentsection of the divided ring.

TWhile it is believed that the operat-ion of the invention will be understood from the above description, it may be briefly stated asfollows: Assuming that the device is set for a three-quarter inch, and it is desired to grind a halt inch drill, the latter is placed in the V-block, which is then lifted by the set screw 18 until the gage 22 rests against the drill and in the flute thereof. The post 25 is then adjusted until the screw 24 abuts against the end of the drill shank. By theny bearing down on the post 25 or on the yarm 26, the cradle is rocked on its trunnions and the same is simultaneously turned in the bearing ring 7. This movement lifts the end of the drill that 4is against the wheel and, at the same time, twists the saine, thereby causing the wheel to grind the end of the drill in spiral shape. There are, of course, two cutting edges on the drill; and, after the above stated operation has been repeated until that side of the drill is suiiicient-ly ground, the latter is turned over and the grinding is continued on the other side.v

Vhile the structure shown and described is very efficient, I realize that many of the details may be varied without departing from the spirit of my invention, and I desire it to be understood that the following claims are not intended to be limited to such details any further than is rendered necessary by the specilic terms therein employed.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is* 1. In a device of the character described, the combination with a supporting ring, of sliding members mounted within said ring, of a drill support within the ring and trunnioned-in the sliding members and means for sliding said members within the iing when the drill support is rocked upon its trunnlons. f

2. In a device of the-'character described, the combination with a supporting ring, of a second ring within the supporting ring and adapted for turning therein, a cradle trunnioned in said second ring, a drill support carried by said cradle, and means tor turning the second ring within the supporting ring when the cradle is rocked upon its trunnions.

3. In a device of the character described., the combination with a main ring, of a second ring within the main ring and in the same plane therewith, said second ring being adapted to turn within the main ring, pivoted means trunnioned within the second ring, a drill supporting device carried by the said pivoted means in position for holding the drill at an angle to t-he plane of 4. In a device of the character described, the combination with a main ring. of a second ring within the' main ring and in the same plane therewith, said second ring being adapted to slidewithin'the'main ring, a cradle extending across the second ring and trunnioned therein, a trough member on said cradle, a V-block within said trough' member, said block being adapted to support a drill for grinding,means for raising or lowering the block within "the trough member, and a guide stationarily mounted with respect to the cradle and engaging with the latter so as to turn it and s he drill as the cradle is rocked upon its trun ions.

5. In a device of the character descr'bed, the combination with a main ring, of 1*lieans for holding said ring stationary w` respect toan abrading wheel, a second ring within the main ring and in the same plane therewith, said ring being adapted to turn within the' main ring, a cradle extending across the second ring and trunnioned in the latter, a trough member on the cradle, a V- block in the trough member, means for guiding said block within said member, means for raising and lowerin the block within the member so asl to position the drill with respect to the abrading wheel, means for eeding'the drill longitudinally against the wheel, an adjustable stop, s ring means for normally holding the cra le against said stop, and a guide inclined to the axis of the cradle and engaging the latter so as toturn it and the second ring within the main ring when the cradle is rocked on its trunnions.

6. In a device of the character described,

'the combination with a main ring, means .for holding said ring stationary in front of the convex Asurface of an abrading wheel, a second ring within the main-ring and in the same plane therewith, said second ring being adapted. to slide within' the main ring, a cradle extending across the secondring and being trunnioned at its ends in said ring, a

trough member on said cradle, said member` having its axis at an angle to the axis of the cradle, a drill support within said trough member, means for adjusting said support for diierent dia-meters of drllls, a gage iinger on the trough member for engaging the drill when the said support isadjusted, and a guide stationarily mounted with respect to the cradle and engaging the latterfor sliding the second ring wlthin the main ring when the cradle is rocked on its trunnions.

7'. In a device of thecharaeterA described, the combination with a main ring, said ring being statimiarilysupported with respect to the convex surface of an abradlng wheel, of

a second ring slidingly mounted within the main ring and in the same plane therewith, retainin ring members secured to the main ring an projecting inwardly to hold .the second ring in position, a cradle trunnioned in the second ring, an adjustable stop, a spring engaging the second ring and the cradle and being adapted' to normally vhold the cradle against said stop, a stationary guideextending at an angle to the axis of the cradle and engaging the latter so as' to'slide the second ring within the main ring when the cradle is rocked on its trunnions, and means carried by the cradle for supporting a drill, said means holding the drill at an angle to the said guide and to the axis of the cradle.

8. In a deviceof` the character described, the combination with a main ring that is stationarily supported in front of the convex surface of an abrading wheel, of a lsecond ring within the main ring and in the same plane therewith, the second ring being adapted to slide within the main ring, a cradle extending across the second rin and being trunnioned therein, said cradle avin a trough member thereon, a V-blockl wit in the trough member, said block being adapted to support a drillyfor grinding, pin guides 'for said block, means for adjusting the block along thepins and within the said member,

an arm on the said. trough member, a post Y adjustably mounted on the said arm, a screw carried by said `post and adapted to engage the shank end of the drill for forcing the latteragainst the abrading wheel, a gage finger carried by the trough member and adapted to engage the latter, sa id guide being inclined with respect to the axis of the cradle so as to cause the second ring'to turn i.

within the main ring when the cradle is rocked on its trunnion.

9. In a device of the character described,

the combination with a main ring that is stationarily secured with respect to the convex surface of. an -abrading wheel, of as'ccond ring within the mam ring and in the same planetherewith, saidk second ring being` adapted to slide within the main ring, devices secured to the main ring for retaining the second ring in position, a cradle extendingacross the second rin and being journaled therein, an adjusts. le stop, a spring engagin with the second ring and with the cradle or`ho1dingv the latter against said e stop, aiguide stationarily mountedvwith respect to the cradle and engaging t said guide being inclined resric axis of the cradle so as toturn the second ring withinl the main-ring when the 4cradle isv rocked on its trunnions, a trough member on the cradle, saidgmember extending at an an-- gle tothe guide'and to the axis of the cradle,

a V-block within-the trough member, pin. i

uidesw-ithin the said member. and within the block for guiding the latter, a screw CTX passing through the bottom. of the trough and abutting against the tl-block for adjusting the latter in the trough, a11 arm extend- Lomme gagement by the drill as the block is adjust 10 ed, as and for the purpose specified.

1n testimony whereof, I hereunto aix my ing from the trough, a post adjustably signature in the presence of two Witnesses.

mounted on said arm, a screw carried by the post in position for engagement with the shank end of the drill as it lies in the V- biock, and a gage finger secured to the trough and extending into position for en- BUNNE L. MALLRY. Witnesses;

BRENNAN B. WEST, MANSFIELD ML WEST.