US1377118A - Machine for shaping articles by grinding - Google Patents

Description

y M. A. EATON. f MACHINE FOB SHAPING ARTICLES'BY GBlNDlN-G.

APPLICATION lFILED MAR. I3. |920.

' Patented May 3, 1921.

2 SHEEIS-SHEET l.

IVI. A.'EATON. MACHINE FOR'SHAPING ARTICLES BY GRINDING.

APPLICATION FILED MAR.`I3, 1920. I l lil l 8. Patented-.May 3, 1921.

42 SHEETS-SHEET 2.

MALVERN A. EATON, 0F LET'ILI.|F '1ON,v NEW HAMPSHIRE, ASSIGNOR TO PIKE MANU- FACTURING COMPANY, OF PIKE, NEVI HAMPSHIRE A CORPORATION OF NEW HAMPSHIRE.

Specification of Letters Patent.

intenten tray a, resi.

Application ledMarch 13, 1920. Serial No. 365,612. Y

the following is a description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to grinding machines vtor truing and finishing the ends of sharpening stones such as oil stones, whet stones and the like, and other articles, and has for its object to provide a machine for this purpose which willbe simple and comparatively inexpensive in construction and operation and will be eiiective to grind the ends of a considerable number of stones or other articles at the same time. Y A further object of the invention is to provide simple and effective mechanism toreciprocate the stones or other articles across the face of the grinding means. A further object of the invention is to provide means for regulating the pressure of the stones or other articles to be ground, against the grinding means.

A A further object of the invention is to provide means by which the stones or other articles t0 be ground may be conveniently inserted in and removed from the machine.

With the above described objects and other objects hereinafter described in view my invention consists in the construction andl combination of elements hereinafter described and claimed.

Referring to the drawings;

Figure 1 is a side elevation of a complete machine for grinding the ends of sharpen- Ving stones embodying my invention,

Fig. 2 is an end view of the machine shown inrFig. 1,

Fig. 3 is a fragmentary cross sectional View online 3-3 of Fig. 1 on an enlarged scale, Y

grinding disk preferably consisting of a disk of cast iron supplied with sand or other finely divided abrasive material and water, by any convenient means. 2 indicates a cross beam preferably of 1 shape in cross section,-supported by any convenient means in liXed position above and in a plane parallel with the plane or" the upper surface of the grinding disk 1. 3 indicates a holder for the stones to be ground. This holder for the stones to be ground consists, as shown in detail in Fig. 5, of a rectangular frame divided into sections by cross bars 4, 4, and provided'in its sides 6 andl 7 with set screws 5. The side 6 is preferably provided at its ends with vertical rollers 3 which, in operation bear against a lined bar 9 extending across but above and out of contact with the tace oic the grinding disk and serving to prevent the work holderrtrom being carried around with the grinding disk as it rotates. The stones or other articles to be ground 10 are clamped in the sections of the work holding trame by means of the set screws 5, a considerable number or' the stones to be ground being thus held assembled so as to be all ground at the same time.

1n the operation of grinding' the stones the work holder 3 is reciprocated in radial direction across the tace of thegrinding` disk Vbeing held against being carried with the grinding disk in its rotation, by the lined bar 9 as clearly shown in Fig. 6. y1`he work holder is provided at its ends with trunnions 11 and 12 which are journaled respectively in the lower ends of vertical arms 13 and 14,

the upper ends o which embrace and are free to move vertically on the ends of a bar 15 preferably I shaped in cross section and adjustably supported trom the cross beam 2 as hereinafter described. As the weight of the work holder 3 with the stones carried by it and the arms 13 and 14, is or may be toogreat to permit the most eiiective .operation of the grinding disk, this weight is arranged to be more or less counterbalanced. r1`he means for this purpose comprises arms 16 and 17 pivoted at their vouter ends tothe vertical arms 13 and 14 respectively and 4connected between their ends by links 18 and 19 respectively, to the bar 15, the inner ends of the arms 16 and 17 ext-ending beneath a weight 20 which rests on them being guided by rods 21 and 22 eX- tending downward from the bar 15, the weight by its pressure on the inner ends of the arms tending to raise the vertical arms 13 and 14, and with them the work holder 3.V A lever 23 pivoted at 24 to the weight- 20 and having one end connected by link 25 to vertical arm 13 and carrying on its other end an adjustable weight 26, serves to regulate the pressure of the weight 20.

The bar 15 is supported near its ends by vertical screws 27 and 28 which engage screwthreads formed in the bar, and are swiveled at their upper ends in a bar 3() which is provided near its ends with brackets 31 and in which are jouinaled pairs of rollers and 34 which are adapted to travel on the lower flanges of the l beam 2. The vertical screws 2'? and 28 are provided near their upper ends with gears 85 and 36 which are in mesh with pinions 37 on stub shafts which carry gears 3S and 39 with which mesh bevel gears 4 and 41 carried by horizontal shaft 42 having at one end a hand wheel 43 for operating it. By rotating the hand wheel the screws 2? and 28 are rotated toy raise or lower the bar 15.

Near its lower end the vertical armv 14 is provided with a shaft 44 onwhich is pivoted a lever 45 provided on its under side with a notch 46 adapted to engage any one of a series of pins 47 carried by a swinging lever 48 pivoted at its upper end in a breekt 49 on the cross beam 2. Near its upper end this swinging lever is provided with a slot t() with which engages a pin 51 carried by a Y pitman 52 the other end of which is pivoted to a crank 54 on a shaft 55 journaled in a block 56 carried on the cross beam 2. @n the shaft 55 is a bevel gear 5( which is in mesh with a bevel pinion 58 on a shaft 59 which, by means of suitable gearing as shown, is arranged to be driven by a belt 60 from any convenient source of power.

ln order to keep the work holder 8 from turning on its trunnions 11 and 12 while the stones are being ground, holding arms 61 and each having a not-ch 623 at its end are caused to engage the frame of the work holder on opposite sides ef the trunnion These holding arms 61 Yand 62 are eccentrically mounted on the shaft 44 which is arranged to be rotated by hand wheel 64 and is locked against rotation by spring pawls 65.

ln order to permit the stones to be inserted in the work holder the lever 45 is raised to -disengage its notch 46 from the pin 4'? and is then swung down out of line with the swinging lever 48. The arms 14 and 13 and the 'parts connected with them are then moved to the right as shown in Fig. 1, until the arm 13 is clear of the grinding disk the rollers 33 and 34 traveling on the lower flanges of the cross beam 2. When thus run back clear of the grinding disk, the hand wheel 64 is rotated to withdraw the ends of arms 61 and 62 from engagementwith the end of the frame of the work holder 3 and this work holder 1nay then be rotated on its trunnions 11 and 12 to swing it to a vertical position. The stones may then be packed into the sections of the work holder and secured therein by set screws 5. W hen the stones' are all in place the work holder is swung to horizontal position and secured in such position by engaging the notches 63 of the arms 61 and 62 with the end of the'work holder frame, the shaft 44 being rotated to cause the arms to hold the frame in horizontal position. The work holder and the parts connecten with it is then run forward over the grinding disk and the lever 45 is brought up and its notch 46 is caused to engage one of the pins 47 of the swinging lever 48. The machine is then ready for operation. ln order to facilitate the movement of the work holder off from and onto the grinding disk the weighted end of the lever 23 may be depressed to lift the stones free of the surface of the grinding disk.

1n operation, `after the work holder is in position, the lever 48 will be swung to and fro by the pitman 52 and, through the lever 45, will reciprocate the work holder on the surface of the grinding disk, the pressure of the stones against the' grinding disk being regulatedby the weight 26. The screws 2'? and 26 serve te adjust the height of the work holder and may be operated through the hand wheel 43 to gradually lower thework holder as the stones carried by it are ground away. n

lWhile the machine shown and described is particularly designed and intended for use in grinding the ends of sharpening stones which are rectangular in cross section, it is obvious that it may be used to grind the ends of sharpening` stones of other lshages in cross section or to grind the sides or faces of such stones or the ends,` sides or faces of other articles than sharpening stones which are adapted to be secured in a holder such as that described, and lthe invention is not intended to be limited to the particular' use described. lt should be understood that l do not desire tobe limited to the particular construction shown or described as it is obvious that such construction and the arrangement of the yparts may be modified in many ways without departing from the spirit of the invention.

Having thus described my invention what l claim is:

l. ln a machine for shaping articlesby grinding, the combination of a grinding disk rotating in a 'horizontal plane, a fixed track `above and parallelwith Vthe face of the grinding disk, a frame suspended from and movable on said fixed track, means for reciprocating the frame, a work holder carried by the frame adapted to hold the articlesto be ground in contact with the face or the grinding disk, and means carried by the frame for counterbalancing the rweight ofthe workholder.

2. ln a machine for shaping articles by grinding, the combination of a grinding disk rotating in a horizontal plane, a fixed track above and parallel with the face of the grinding disk, a trame suspended from and movable on said track comprising a horizontally arranged bar and arms suspended from and vertically movable on said bar, a work holder carried by said arms adapted to hold the articles to be ground in Contact with the face of the grinding disk., and means carried by said bar for counterbalancing the weight of the work holder.

3; In a machine fol1 shaping articles by grinding, the combination of a grinding disk rotating ina horizontal plane, a fixed track above and parallel with the face of the grinding disk, a frame suspended from and movable on said track comprising a vertically adjustable horizontally arranged bar and arms suspended from and vertically movable on said bar, means for reciprocating the frame, a work holder carried by said arms adapted to hold the articles to be ground in contact with the face of the grinding disk, and means carried by said bar for counterbalancing the weight of the work holder.

4. In a machine for shaping articles by grinding, the combination of a grinding disk rotating in ahorizontal plane, a lixed track above and parallel with the face of he grinding disk, a frame suspended from and movable on said track comprising a horizontally arranged bar 'and arms suspended from and vertically movable on said bar, means for reciprocating the frame detachably connected therewith, and a work holder having trunnions at its ends journaled in saidarms and adapted'to hold the articles to be ground in contact with the face of the grinding disk.

5. In a machine for shaping articles by grinding, the combinationV of a grinding disk rotating in a horizontal plane, a fixed track above and parallel with the face of the movableV on said track comprising a horizontally arranged bar and arms suspended from and vertically movable on said bar, means :tor reciprocating the frame detachably connected therewith, a work holder having trunnions at its ends journaled in said arms, and means for holding the Work holderl in horizontal position to hold the articles to be 4ground in contact with the face or" the grinding disk. y Y

6. In a machine for shaping articles by grinding, the combination of a grinding disk rotating in a horizontal plane, a fixed track above and parallel with the face of the grinding disk, a frame suspended from and movable on said track comprising a horizontally arranged bar and arms suspended from and vertically movable on said bar, means for reciprocating the frame, a work holder carried by said arms adapted to hold the articles to be ground in contact with the face of the grinding disk, and means fpr counterbalancing the weight of the work holder comprising levers pivoted at their ends to said. arms, Julcrumed in links de* pending from said bar and having a weight bearing downward on their inner ends.

7. In a machine for shaping articles by grinding, the combination of a grinding disk rotating in a horizontal plane, a fixed track above and parallel with the face of the grinding disk, a frame suspended from and movable on said track comprising a horizontally arranged bar and arms sus pended from and vertically movable on said bar, means for reciprocatingthe Jframe, a workholder carried by said arms adapted to hold the articles to be ground in contact with the face of the grinding disk, and means for counterbalancing the weight of the work holder comprising levers pivoted at their outer ends to said arms, fulcrumed in links depending from said bar and having a weight bearing downward on their inner ends and levell pivotally connected at one end to one of said arms, pivotally connected near its midlength with the weight and having a weight adjustably mounted on its free end.

In testimony whereof l aflix my signature this. fourth day of March, 1920.

MALVERN A. EATON.

Images