US1862809A - Grinding machine - Google Patents

Description

A.'J. STRONG GRINDING MACHINE Filed Feb. 16. 1929 Junev 14, 1932.

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Patented June 14, 1932 g 1,862,8ea

UNITED STATES PATENT yorricia:

ARTHUR J. STRONG, F DETROIT, MICHIGAN GRINDING MACHINE Application filed February 16, 1929. Serial No. 340,497.

byuse of like characters which are employed to designate corresponding parts through- 1n Fig. 3 it Will be seen that tlie inacliine is built on a base 1 having at one end a translips of the lutes or blade will not be trimmed base.

to the radius of the tool but yvill be ground down behind the cutting edge in order to proverse guide iii which slides a support 3 carrying the griiidstone 4. .screw turns loosely ina collar 6 depending from the support 3 and threads through a nut 7 supported by the base 1, whereby the grindstone may be adjusted transversely of the An adjusting The base is formed with still another gude or u'ay 8 in iront of the stone for supportvide clearance beliind'this edge. This obing a carriage 9 which slides longitudinally ject is accomplished essentially by mounting ot the base. The lower portion of the carthe tool in a clamp supported on a carrier which in turn is adapted to swing on an axis eccentric of the clamp. y The carrier is swung downwardly during the grinding operation,

riage carries a rack 1t), and iii the base 1 is joui'naled a. shaft 11 carryng at one end a hand Wlieel12 and at the other end a pinion 13 meshing with the rack 10. By th .s means, the

as a result of which a convex tip is formed, carriage may readily be adjusted longitubound on one side by the cutting edge and dinally of the base.

on the other side by a rear edge which is at a less distance from the center of the too'l than 115 is the cutting edge.

The invention further embodies various adjustments for the severalparts as ivell as other objects and advantages, all of which are fully disclosed by Way of example in the following description and in the accompanying drawings in which Figure 1 is a fragmentary plan view of the machine, partly in section;

Fig. 2 is an elevation thereof;

Fig. 3 is a detail transverse section, partly in elevation;

Fig. 4 is a section on t Fig. -5 isa detail plan View showing a dress- 'ing instrument applied to tli'e machine;

FigQ is an elevation at the side opposite lhat'shoivn in Fig. 2; and

Fig. 7 is a diagrammat movement'of the carrier relative to the grindstone.

The base supports a pair of upright bearings 15 at its ends to provide a swivel mounting for a pair of arms 1G having journals 17 extending into these bearings. To the inner faces of the ai'nis 16 ai'e attached plates l5 by means of bolts 19, for a purpose which will presently appear. The plates are formed with double or oppositely extending hubs 20 which receive a rod or shaft 21 lying longitudinally of the carriage at the forward edge thereof. The outer/end of each hub extends into the adjacent arin 16, and the two inner ends serve to support a carrier body 22 which i, encloses the iod 21. The inner ends of the he llneA-i-Oli 1g' 1 hub are further 'secured to the rod 21 by means of pins 23 asclearly shown-in Fig. 1. Each end of the liollow'rod 21 contains a plug 24 with a liole or socket in Which is reje View Showing the vceived a split conical member 25, having a,

` "stem 2G extending outwardly beyond the adjacent' arm 16. The stem is surrounded b lReference to these views will now be had a disk 27 and agi'ooved cani 28 against whic the socket member 24 is drawn by r. nut 29 threaded on the extremity of the stem 26.

It will now be evident that the carrier assembly is adapted to swing in the bearings 15. However, it is normally held in a raised position by bow springs 30 wound around studs 3l on the bearings 15 and having one end in engagement with the corresponding grooved cam 28 and the other end resting in a seat 3l on the carriage 9 (Fig. 3). The upward movement of the carrier is limited by a set screw 32 adjustable in a lug 33 extending from one o'l' the bearings and engagcable by a lug 34 extending from the adjacent arm 16 as shown in Figs. 1 and 4. The tension of the springs is regulated by adjusting the cams on thestems 26, inasmuch as the cams may be locked in any desired position by means of the nuts 29.

To the side of the body 22 facing the stone 4are secured a pair of arcuate guides 35 by means of bolts 36. These guides form an arcuate way for a carrier plate 37 therebetween and pivoted at its midpoint to the carrier body by a stud 38. The plate 37 in turn carries a pair of bearing brackets 39 adjustable thereon and supporting longitudinally adjustable centers 40 which are arranged eccentrically of the journals 17. The tool 41 to be sharpened is mounted on a mandrel 42, the ends of which are held by the centers as shown in Fig. 1.

Upon the carrier bodv 22 is mounted a short track member 43 in which one end of an arm 44 is adjustably held by a clamping bolt and nut 45. The arm extends over the tool 41 and carries a slidable block 46 in which is adjustably mounted a stop linger 47 adapted to engage the upper surface of the finger of the blade 48 which is diametrically opposite the blade in contact with the stone, as shown in Fig. 3'. The inner extremity of the arm 44 carries a swingable gauge 49 which determines the position of the blade engaging the` stone.

In the operation of the device as thus far described, it will be seenithat one of the flutes or blades to be ground is brought into contact with the stone 4. In the normal position of the carrier and tool, as indicated by dot and dash lines in Fig. 7, the stone 4 forms a convex edge on the blade or finger 48 in contact therewith. As the carrier is depressed against the action of the springs 30, the tool moves in an arc eccentric of its centers 40, whereupon the trailing edge of the blade is brought closer to the stone and ground down, while the leading or cutting edge is retracted from the stone, as shown in full lines in Fig. 7, with the result that the blade is formed with a convex tip 48 having its trailing edge at aless distance from the center than the leading edge, thereby providing clearance behind the leading or cutting edge. l

After a blade- 48 has been thus ground, the

carrier body is swung upwardly around the hub members 20, bringing the tool well away from the grindstone so that it may safely be adjusted for grinding another blade. The stop 47 is withdrawn, and the gauge 49 swung away from the tool, so that the latter may be turned to present another blade or to bring another bladein a position to be worked upon f tion which brings the blades parallel to theI axis of the grindstone. The adjustment of the plate is permitted by loosening the bolts 36 which are tightened again after the proper angle'of compensation has been determined by means of 'graduations 50 on one of theV guides and an index 50 on the end of the carrier plate adjacent thereto.

The grindstone 4 is here illustrated as hav-- ing a fillet 51 at one edge for rounding off one of the ends 'of the cutting edge of each blade.

The blade first lies entirely along the cylindrical surface of the grindstone but is subsequently carried to the fillet 51 by the means which will now be described.

One of the journals 17 (Fig. 1) has its outer end cut at an angle to form a cam 52. stem 53 extends from this journal. through a cam member 54 held in the corresponding bearing 15 by bolts 55 and adapted to cooperate with the cam face 52. The outer extremity of the stem 53 carries -a nut 56 and is surrounded by a compressed spring 57 bearing against the member 54 and the nut 56 to draw the cam face 52 against the cam 54. Consequently, on depression of the carrier and rotation of the journals in themanneralready described, the contacting cam faces shift the carrier and hence the tool 41 toward the fillet 51, so that one end of thecutting edge is rounded olf.

The curvature of the tip 48 of the blade depends on the distance between the axes of the journals 17 and the clamping centers 40. In order to vary the curvature of the tip for various requirements, the axes of the centers 40 may be adjusted with reference to the axes of the journals 17. To this end, each of the bolts 19 works in a slot 58 in the adjacent plate 18. Each plate is also formed at its inner end with a notch 59 receiving a stud 60 extending from the adjacent arm. By loosening the nuts 19, the plates 18 may be adjusted relatively to the arms 16. The carrier body 22 which is rotatable on the hubs 2O tends to swing because of the weight of the bearings 39 and follows the adjustment of the plates 18 by reason cooperating with stop pins 62 extending from the plates.- The desired adjustment may determined by inserting correspondingly d1,.

mensioned shinis lin each notch 59 over thestud 60 and bringing the studs, shims and- -upper walls o the notches into mutual contact by set screws 63 threaded through the l bottom walls of the notches and engaging the studs.

In Fig. is illustrated adevic'e fora dressing the face of the grindstone 4. One of lthe bearings 39 carries an ear 64 to which is pivotall attached an arm 65 extending to a point a jacent the other bearing 39. o

` base 1 of the machine is secured a bracket 66 bearing 39 and there'equip.

adjacent the last named ed with a guide 67- conforming to the pro le of the stone.

extending toa point The guide is detachable by means of screwsv 68 so that it may readily be replaced by of notches 61 in the ends thereof the- 3., Ina grinder its journals.

In testimony whereof I aix m si ature. ARTHUR J. TR NG.

other guides for various styles of stones..

The free endof the arm 65 carries a in or roller 6 9 adapted to ride along the gui e, and to an intermediate point of the arm is se cured a dressing instrument 70, such as a sharp pointed member or a diamond point, adapted to run across the face of the stone. This instrument is normally urged into contact with the stone byl means of a spring 71 connecting the arm 65 to the bracket 66. TheA transverse movement of the instrument with v respect to the stone is obtained by operating carrier pivotally and sli ablysupp `of said members bein being movable with said carrier to move 'the' swung on its pivotal axis.

the hand wheel 12 which results in the movement of the carriage 9 and bearings' 39 axially of the stone.

- .Although a specific embodiment of the invention has been illustrated and described, it

.will be apparent that various alterations in the details of construction may' be made .without departing from the scope of the intowards said illet as the carrier is swung on 75 ventionV as mdicated by the appended claims.

1. In a grinder for use in conjunction with a grind'stone havin a fillet, a base, a orted 'by said base, clamping means on said carrier for holding a work piece to be ground,

means for adjusting said'clamping means 1n an eccentric relation to the pivotal center of said carrier, co-operatin cam members, one

xed and the other armer towards said llet as the carrier is 2. In a grinder for use 1n a grindstone having a fillet, a base, a; carrier conjunction with pivotally and slidably supported by said base, clamping means on said carrier for holding a work piece to be ground, means for adjusting sai centric relatlon to the pivotal center of said clamping means in an eccarrier, and means operable on pivotal movel 'ment o said carrier for sliding the carrier towards said fillet.

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