US2107921A

US2107921A - Grinding device

Info

Publication number: US2107921A
Application number: US110395A
Authority: US
Inventors: Walter A Weed
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-11-11
Filing date: 1936-11-11
Publication date: 1938-02-08
Anticipated expiration: 1955-02-08

Description

Feb. 8, 1938.

w. A. wEED 2,107,921

GRINDIHG DEVICE Feb. 8, 1938.

w. A. wEED GRINDINQ DEVICE Filed Nov. 1l, 1936 4 Sheets-Sheet` 2 Feb. 8, 1938.

W. A. WEED GRINDING DEVICE Filed Nov. 11, 193e 4 Sheets-Sheet 3 gmmrm v /VCl/Z/ter. @MW

Gum/g Feb. 8, 1938.

Filed Nov. 11, 1936 w. A. wEED GRINDING DEVICE 4 Sheets-Sheet 4 gmc/wim WcLZter. l/Veed/ www Patented Feb. 8, 1938 UNITED STATES PATENT oFElcE 10 Claims.

My invention relates to devices for sharpening or-grinding tools or the like, having straight or curved cutting edges.

The important object of the invention is to provide a device of the above mentioned character which will held and guide a tool having a beveled edge to be sharpened or ground so that the beveled edge will be tangent to the periphery of the rotary grinding element.

A further object of the invention is to provide a device of the above mentioned character which will guide the tool in its swinging movement across the face of the rotary grinder to grind or sharpen its curved edge and limit such swinging movement to insure proper action.

A further object of the invention is to providey adjustable means to limit the swinging movement of the tool holder so that the same may be used with rotary grinding elements of differentfsizes.

A further object of the invention is to provide means to adjust the tool holder toward and from the periphery of the grinding element so that the beveled edge of the tool will be presented at a proper angle to the grinding element.

A further object of the invention is to provide adjustable means for retainingthe tool holder against swinging movement while the tool holder is being adjusted or receiving the tool therein, or while it is holding a tool having a straight cutting edge to be ground.

A further object of the invention is to provide a tool holder adapted for holding blades which are curved or at in cross section.

A further object ofthe invention is to provide a device of the above mentioned character which is` adapted to hold and guide the blade to the side of the rotary grinding element, at the proper angular position with relation thereto.

Other' objects of advantage oi the invention will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a perspective view of a grindingl device embodying my invention,

Figure 2 is a side elevation of the same,

Figure 3 is a transverse section taken on line 3-3 of Figure 2,

Figure 3 is a detailed section through the arm of the support,

Figure 4 is an end elevationl of the device,

Figure 5 is a vertical longitudinal section taken on line 5 -5 of Figure 4,

(ci. 's1-234) Figure 6 is a horizontal section taken on line 6-6 o! Figure 5, parts in elevation,

Figure 7 is a side elevation, parts omitted, showing the work clamp inverted to receive a :dat blade.v

Figure 8 is a perspective view of a device embodying a. modied form of the invention,

Figure 9 is a plan view of the same,

Figure l is a horizontal section taken on line Ill- I0 of Figure 11, parts in elevation, and,

Figure 11 is a side elevation of the device.

Attention being called rst to Figures 1 to '1 inclusive, the numeral I designates a horizontal sllDPOrt or table top, upon which is mounted a grinding unit, comprising a rotary grinding element or wheel I6, which may be cylindrical. This grinding element or wheel may be a dry grinding wheel, such as emery, or it may be a wet grinding element, such as a grind stone. The grinding element I 6 rotates in a vertical plane and is preferably power driven.

Arranged near and upon one side of the grinding element or wheel I6 is the work holding and guiding device, comprising a lower U-shaped support or bracket I'I, rigidly attached to table top I5 and including vertical arms I8. This bracket has its longitudinal axis disposed at a right angle lto the plane of rotation of the grinding'element I6 and projects beyond the ends of the same, and for a considerable distance upon one end, as clearly shown in Figure 4. 'I'he vertical arms I6 are provided with spaced openings I9, extending longitudinally thereof, and these openings slidably receiving a horizontal pivot or supporting rod or element 20, having a reduced extension 2|' at each end, which is threaded to receive a wingednut 22. lThe shaft or pivot element 20 is therefore, removable from within the openings I9 so that it may be inserted within selected openings I9 at the desired elevation. The winged-nuts hold the shaft 20 in place against displacement, but permit of its removal, when desired. It may be necessary to vary the elevation of the shaft or pivot element 2li, to compensate for the diameter of the grinding element or wheel I6.

'I'he numeral 2l designates a swinging support or yoke, including arms 2l., having openings at the lower ends to slidably receive the shaft or pivot element 20. This support or yoke is therefore, pivotally mounted upon the shaft 20 so that it may be swung vertically in the plane of rotation of the grinding element or wheel I6. 'I'he support or yoke 2l is provided at its upper closed '-end 22 with a guide-base or strap 23, rigidly secured thereto, and this guide-base has a carriage 2d slidably mounted thereon. This carriage is preferably in the form of a loop, affording an inner passage 25. Rigidly attached to the upper closed end 22 of the yoke 2l at the end of the guide-base 23 is a transverse guide socket 26, through which the base 2li of the carriage slides. The carriage 2d is therefore capable of moving longitudinally of the guide-base 23 but can not move perceptibly transversely thereof. The guide socket 26 carries a set screw 28, by means of which the carriage Efimay be locked in the longitudinal adjusted position. The carriage is provided in its rear end with a screw-threaded opening 2d, for receiving a screw threaded rod 30, having a smooth portion 3i, rotatable within openings 32, 'formed in a transverse loop 33, carried by the guide strap on base-guide 23. A milled wheel 3d operates within the loop 33l and is rigidly attached to the screw threaded rod 3. It is thus seen that by turning the milled wheel 34 the carriage 21% may be longitudinally adjusted upon the guide base 23.

A vertical rod or bar 35 is rigidly attached to the forward end of the carriage 2d, and depends below the same and this bar is provided at its lower end with a horizontal portion 36, disposed at a right angle to the bar 35. This horizontal portionextends longitudinally of the carriage in a forwardly direction from the same. The horizontal portion 33 is adaptedto pivotally support a work holder or clamp, to be described.

The work holder or clamp comprises an outer unit including an outer curved jaw 3l, rigidly attached to rods 33, which are rigidly attached to the ends of a straight outer jaw 39. The numeral l0 designates an inner coacting curved jaw of an inner unit and this jaw is secured to an inner straight jaw d i, to coact with the straight jaw 39. The jaws Ml and di are preferably rigidly and detachably connected by screws 42' 4or the like. The curved jaw dll is provided with vertical space apertures t2, for pivotally receiving the horizontal extension 3G. Two or more of the openings dZ are provided to vary the elevation of the pivot of the workclamp and adjust the extent f l of swinging movement. The extension 36 has a shoulder or stop 36', and carries nuts 3l' having screw-threaded engagement therewith'. The elements 36' and 3l hold the jaw 40 against displacement. The at stationary jaw 39 has a screw threaded opening 43, receiving the screw threaded portion ofa clamping rod di, turned by a'. milled wheel 45 rigidly securedthereto. The lower end of this clamping rod contacts with .the movable straight jaw M but has no screw threaded engagement therewith. It is thus seen that the blade or work t6, which is curved in cross l section may be arranged between the curved sur- .faces of the jaws 3l and 40 and rigidly clamped between them by manipulation of the clamping rod dit. By removing the clamping rod M from within the opening 43, and inverting the work clamp, the'clamplng rod M may then have its screw threaded portion engaged' within the threaded opening. 43 of the stationary curved jaw 3l, while its free end will contact with the upper portion of themovable curved jaw 40 but will have no screw threaded engagement therewith. With the parts so adjusted, as shown in Figure 7, the work 4,8, which may be a flat blade, may be arranged between and clamped to the straight jaws 39 and 4I.

Adjustable means are provided to hold thel work holder against swinging movement upon the extension or pivot 36, when the clamping rod screw 52, rigidly attached to the top of the carriage 263, and carrying a nut 53. The nut is employed to clamp the latch-bar in the selected adjusted position. When the latch-bar is projected forwardly, the clamping rod M is held within the slot 5l, and hence the work clamp can not swing upon its pivot 36.

Adjustable means are provided to limit the swinging or rocking movement of the work holder and work clamped therein. This means comprises a vertically adjustabley stop-element 5d, which is L-shaped in cross section and includes a vertical web 55 and a horizontal web 56. The horizontal web is provided with an opening 5l, slidablyreceiving the rod 35 and the horizontal web 5S hasa screw threaded rod 58 rigidly attached thereto, near and rearwardly of the rod 35. This screw threaded rod operates within openings 53, formed in the top and bottom of the carriage 2d andhas no screw threaded engagement with the walls of the openings 59, which are not screw threaded. The screw threaded rod is therefore capable of moving longitudinally within the openings 59 and does not turn therein. An adjusting nut 60 is arranged within the carriage 2d and has screw threaded engagement with the rod 58 and is provided with a milled l wheel ti, by means of which it may be turned. By turning the nut 60 the screw threaded rod 58 is moved longitudinally. The screw threaded rod extends through the slot 5i in the forward end of the sliding latch-bar t9, and the screwl plane of rocking movement of the work holder.

The vertical web 56 is disposed in the path of travel of the blade d6 of the work, and will therefore limit the rocking movement of the blade and work holder, when swung in opposite directions. The adjustable stop-element serves to thus limit the rocking movement of the work transversely of and upon the periphery of the grinding wheel I6, thus retaining the blade upon this periphery, during the grinding operation.

Adjustable means are provided to hold the yoke 2l against accidental longitudinal movement upon the rod 20, including collars 6d', sldably mounted upon the shaft 20 and clamped thereto by set screws The collars lit' may be omitted if desired.

4 The operation of the rst form of the device embodying my invention vis as follows:

When it is desired to grind the blade t6 which is curved in cross section and 'has a beveled cutting edge, the curved jaws 3l and 40 of the work holder are arranged lowermost, as shown in Figures 1 to 5 inclusive. When these curved jaws are to be adjusted to receive and clamp the work 46 therebetween, the sliding latch-bar 49 is shifted to the forward position sothat the cllamping rod M is held within the forward slot 5 movement and thereby renders more convenient This holds the workholder against rocking I the insertion of the work 46 between the jaws 31 and 40. After the work has been placed between the jaws 31 and 40, the clamping rod 44 is turned and the inner end of this rod will force the jaw 40 toward the-jaw 31, thereby securely clamping the work between these jaws. The pivoted yoke 2| tilts forwardly so that the beveled cutting edge of the work will contact with the periphery of the rotary grinding wheel I6. In order that this beveled cutting edge may be disposed at a tangent to the periphery of the grinding wheel I6, the work must be arranged at the proper angle with respect to the grinding wheel, and this is effected by longitudinally adjusting the carriage 24. This is effected by unscrewing the set screw 28 and then turning the milled wheel 34 which turns the adjusting rod. If the adjustment of the carriage 24 is forwardly toward the grinding wheel, the work is advanced toward the top of the grinding wheel and the carriage and yoke 2| are automatically swung upon their pivot 20 so that the proper angular adjustment of the work is obtained, and the carriage is moved longitudinally until the beveled edge of the work is at a tangent to the grinding surface or periphery of the grinding wheel. After this adjustment'is made, set screw 28 is again screwed up and the carriage is locked in the adjusted position. It now remains to adjust the stop-element 54 vertically to properly limit the rockingmovement of the work so that the entire beveled cutting edge may be brought into engagementwith the periphery of the grinding wheel, and yet will not accidentally move therefrom. This adjustment is effected by moving the sliding latch-bar 49 rearwardly so that it releases the clamping rod 44 and the work clamp -is free to rock. The operator grasps the handle 45' of the work and then rocks the work-holder through the medium of the work. The lock-nut 62 is first unscrewed sufiicien'tly and the adjusting nut 60 is turned to vary the elevation of the stop-element 54, until the selected elevation is obtained, at which time the stop-element is again clamped in the adjusted position by screwing up the lock-nut 62. 'Ihe operator holds the handle 46 in the hand and the grinding wheel |6is set into rotation and the work 46 is now rocking in opposite directions, the work-holder turning upon the extension l36, and having its rocking movement limited by the contact of the work with the vertical web 54 of the stop element, Figure 3.

Should it be desired to grind the beveled edge of flat work 48, Figure 7, the clamping rod 44 is removed from Within the opening 43 'and the work-holder is inverted so that the straight jaws 39 and 4| are in the lowermost position. 'I'he screw threadedportion of the clamping rod 44 is now engaged within the screw threaded opening 43' of the curved jaw 31 and the clamping '.rod will not contact with the top of the inverted curved jaw 40. The sliding latch-bar 49 is shifted forwardly to engage with the clamping rod 49 and prevent rocking movement of the work-holder. the jaws 39 and 4| and clamped between them by turning the wheel 45, as is obvious. The carriage 24 is longitudinally adjusted to angularly adjust the work with respect to the grinding wheel. Since the work is flat it is not rocked during the grinding operation and hence the sliding latch-bar 49 remains in the forward position. The grinding wheel is rotated and the work may be held under suitable pressure upon The work 48is now passed between4 the grinding wheel by the operator holding the handle of the Work or holding the carriage 24.

Particular attention is called to the fact that the sliding latch-bar 49 servesto hold theworkholder against rocking movement when the curved work is being inserted therein, and subsequently releases the work-holder for rocking movement, while the same latch-bar holds the workholder against rocking movement during the insertion of the work therein and also during the grinding operation, when flat work is acted upon.

The collars 64' may be clamped to the rod 20 so that the yoke 2| is held against longitudinal movement upon the rod, after being adjusted thereon, or the collars 64 may be slidable thereon. When using a dry grinding wheel, it is desirable to cool the'work, which may be effected by shifting the yoke to the right, Figure 4, until it clears the grinding wheel and then swinging the yoke 2| downwardly to dip the work into water held withinv a receptacle supported upon the table top l5.

In Figures 8 to l0 inclusive, I have shown a modified form of the device, wherein the work is applied to the end of the grinding wheel during the grinding operation. This device comprises a vertical socket 64, rigidly mounted upon the upper surface of a table top 65. This vertical socket pivotally receives the down turned vertical extension 66 of a crank 61, formed upon a vertical pivot element or shaft'68. 'I'he extension 66 may be clamped against movement within the socket 64 by a set screw 69. The vertical shaft is pivotally mounted within openings 69 formed in a horizontal support or yoke 10, the downward movement of the yoke being limited by a ring 1| which is vertically adjustable upon the rod 68 and clamped thereto by a set screw 12 or the like.

Rigidly secured to the vertical closed end 13 of the horizontally swinging yoke is a stationary grooved jaw 14 of a guide including an adjustable companion grooved jaw 15. A clamping screw '16 is provided having a wheel 11 toturn it. This clamping screw passes through an openpasses through an opening 19 formed in the jaw 14 and end 13 and has screw engagement therewith. By turning the screw 18 the jaw 15 may be drawn toward the jaw 14. A hollow or loop carriage 8l) is held by the jaws 14 and 15 and is longitudinally adjustable with respect to the jaws since it is slidable therein, upon the manipulation of the screw 16. This carriage is shifted manually as the adjusting screw 30 of the rst form of the invention is omitted. After this adjustment, the carriage is locked in the adjusted .position by screwing up the screw 16. The same supporting rod 35 and extension 36 are employed, which pivotally support the same work-holder which is quite similar to the work-holder shown and described in connection with the rst form of the invention. The work-holder comprises curved jaws 31' and 40', and straight jaws 39 and 4| Thejaw 4|' is thinner than jaw 4| and jaw 40' has but one opening for pivot 36. All other parts are substantially identical as shown in the first form work-holder. In this form of the` invention the stop-element 54 is omitted. The same clamping rod 44 is employed. This rod is adapted to be held and released by the sliding latch-bar 49. The supporting rod 35 is rigidly attached to the forward end of the carriage 80, and in Figure 9 extends to the opposite sides of the carriage and projects into the slot I of latch-bar 49. This slot receivesthe clamping rod dd. slot 50 slidably receiving a bolt 8i, rigidly `attached to the carriage 80 and carrying a wingednut 82, adapted tol clamp the latch-bar d@ in the adjusted position.

The operation of the device embodying the second form of the invention is as follows:

The sliding latch-bar 49 is moved forwardly so that its slot 5i receives the clamping rod id of the work holder, and the latch-bar may be locked in this position by manipulating the nut 82. The work 66, which is a curved blade is now passed between the curved jaws 3l and dt' and clamped therebetween by turning the rod tl. The carriage Bil may be longitudinally adjusted with respect to the yoke l0, by suitably unscrewing the screw 16 and moving the carriage longitudinally toward the grinding wheel It, subsequently to which the carriage is clamped to the guide by screwing up the screw it.' Since the end of the grinder is ilat, the angular adjustment of the Work to bring the beveled cuttingl edge of thevwork into parallel relation with'the end of the grinding wheel must be eiected. The horizontally swinging yoke 'i0 must therefore be angularly adjusted when the work engages the end of the grinding wheel. To accomplish this, the set screw 'i5 is unscrewed suiiiciently and the vertical rod 68 shifted about its extension t6, until the beveled edge of the work becomes parallel with the end of the-grinding wheel at which time the set screw 59 is screwed up. When the sliding latch-bar 49 is again moved rearwardly, the work-holder is free to rock, and the operator holding the handle of the work presses the work against the grinding wheel and also rocks the work and'work-holder. It is obvious that by reversing the work-holder as explained in connection with the first form of the invention, at work may be held between the at jaws `39 and dl and the sliding latch-bar B9 will then be shifted forwardly to hold the work-holder against rocking movement. The beveled cutting edge of the flat work may then be held in proper engagement with the end of the grinding wheel.

It is to be understood that the forms of my invention here,shown and described are to be taken as preferred examples of the same and that various changes in:A the shape, size, and arrangement of parts, may be resorted to, without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In a grinding machine, a rotary grinding element, a movable support arranged near the grinding element to be shifted toward the same, an adjustable rocking work-holder pivotally carried by the support, a rod to adjust the workholder to cause the same to clamp the work, and an adjustable latch carried by the support to hold and release the rod, said rocking work-holder being incapable of rocking movement when the rod is held by the latch.

2. In a grinding machine, a support, a workholder comprising an inner unit including a straight jaw at one end and a curved jaw at its opposite end, a separate outer unit having slidable engagement with the inner unit and including a straight jaw at one end thereof and arranged opposite to the irst named straight jaw and a curved jaw at the opposite endof the outer unit and arranged lopposite to the first named curved jaw, the straight jaw and the curved jaw The sliding latch-bar i9 has its rear.

of the outer unit having screw-threaded openings, a screw-threaded element for engagement swung in a vertical plane toward the grinding element, a longitudinally adjustable carriage mounted upon the pivoted support for movement in the plane of movement of the support, means to longitudinally adjust the carriage, a rocking work-holder pivotally supported by the carriage to swing transversely of its movement so that the work is shifted in engagement with the periphery of the rotary grinder, the means to limit the rocking movement of the work holder and permit of the swinging movement of the workholder in opposite directions within the limit of movement. A A

d. In a grinding machine, a pivoted support: to be arranged near a rotary grinding element and having a part to be swung in a plane toward the grinding element, a carriage adjustably mounted upon said part of the pivoted support to partake of rectilinear movement in the plane of movement of the pivoted support toward the grinding element and with relation to the plvoted support, a pivot element secured to the carriage and extending longitudinally thereof, and a rocking work-holder mounted upon the pivot element to swing` at generally a right angle to the movement of the carriage.

5. In a grinding machine, a support pivoted near one endand having its opposite end adapted to be swung in the plane toward the grinding element, an elongated carriage adjustably mounted upon said opposite end of the pivoted Asupport to be shifted longitudinally in a rectilinear direction with relation to the pivoted support and in the plane of movement of the pivoted support and toward the rotary grinding element, a pivot element secured to the elongated carriage and extending longitudinally thereof, and a rocking work-holder supported upon the pivot element to swing at generally va right angle to the movement of the carriage.

6. In a grinding machine, a support, means for pivotally supporting the support so that its free end portion is movable toward the rotary grinding element, a carriage adjustably mounted upon the free end portion of the support and shiftable in a rectilinear direction with relation to the support and forwardly toward the work, a pivot element secured to the forward 'end of the carriage and extending longitudinally of the carriage, and a rocking work-holder mounted upon the pivot element to be arranged near the rotary griding element to swingat generally a right angle vto the movement of the carriage.

7. In a grinding machine, a pivoted support to be arranged near a rotary grinding element and having a part to be swung in a plane toward the grinding element, a carriage adjustably mounted upon said part of the support to partake of rectilinear movement in the'plane of movement of the pivoted support toward the rotary grinding element and with relation to the pivoted support, a pivot element secured to the carriage and extending longitudinally thereof, a rocking workholder mounted upon the pivoted support, a stop element in a plane substantially parallel with the plane of movement ofthe rocking work-holder.

8. In agrinding machine, a substantially vertical rotary grinding element, a vertically swingy 9. In a grinding machine, a rotary grinding element, an adjustable support movable toward the grinding element, a supporting rod carried by the support, a rocking work-holder pivotally mounted upon the rod to swing generally at a' right angle to the movement of the adjustable support, an adjustable stop mounted upon the rod and arranged upon one side of the work carried by the work-holder and spaced from the work when the work is in the intermediate position and engaged by the work when the work is swung to the end of its movement ineither direction, and means to move the stop longitudinally of the rod.

10, In a grinding machine, a pivoted support to be arranged near a rotary grinding element for swinging movement toward the same, guide means xedly secured to thel swinging support, a carriage slidablyv mounted upon the guide means, means to longitudinally adjust the carriage, a pivot element extending longitudinally of the carriage and secured thereto, an adjustable work-holder mounted upon the pivot element to swing ,transversely of the carriage, a rod having screw threaded engagement with a part of the work-holder to adjust it, the work-holder being normally free to swing in opposite directions from its intermediate position, a latch adjustably mounted upon the carriage to engage the rod when the work-holder is in the intermediate position, and a stop serving to limit the swinging movement of the work-holder` in either direction from the intermediate position.

WALTER A. WEED.