US1528685A - Die holder for grinding machines - Google Patents

Description

- Mar. 3, 1925.

T. B. MURPHY DIE HOLDER FOR GRINDING MACHINES 3 Sheets-Sheet 1 A Wmsmm Filed Dec. 12, 1925 N &

h N a SIM umber Mar. 3. 1925.

T. B. MURPHY DIE HOLDER FOR GRINDING MACHINES Filed Dec. 12, 1925 3 Sheets-Sheet 2 E1 LIE-.1 U

Mar. 3, 1925.

T. B. MURPHY DIE HOLDER FOR GRINDING MACHINES 5 Sheets-Sheet 5 Filed D eo. 12, 1925 Patented Mar. 3, 1925.

UNITED STATES THOMAS B. MURPHY, OF .ALGONAC, MICHIGAN.

DIE HOLDER FOR GRINDING MACHINES.

Application filed December 12, 1923. Serial No. 680,230.

To all whom it may concern:

Be it known that I, THOMAS B. MuRrHY, a citizen of the United States, residing at Algonac, in the county of St. Clair and State of Michigan, have invented certain new and useful Improvements in Die Holders for Grinding Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in work holders and has reference more particularly to a novel device for holding thread-cutting dies such as those used in stocks, while they are being ground, the princiml object of the invention being to provi e a simple, inexpensive and easily operated device of this character, which may be easily attached to the-supporting stand of an emery or other grinding wheel, the construction being such that both the throats and faces may be ground on dies of different sizes and makes.

A further object is to provide a unique gauge for properly setting the work-holding means, for the first die of any set, the setting for the other dies of said set, being the same.

Vith the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Figure 1 is a side elevation showingthe application of my invention tothe stand of a grinding wheel.

Figures 2 and 3 are horizontal sectional views as indicated by lines 22 and 3-3 of Fig. 1.

Figure 4 is a top plan view partly broken away and in horizontal section.

Figure 5 is a vertical sectional view on line 5-5 of Fig. 4.

Figure 6 is a side elevation.

Figure 7 is a vertical sectional view as indicated by line 77 of Fig. 4.

Figure 8 is a similar view on line 8-8 of Fig. 4.

Figure 9 is a detail vertical section as indicated by line 99 of Figs. 4 and 6.

Figure 10 is a perspective view of the gauge.

a screw or the like 2 to a horizontal ledge 3 with which the stand 4 of a grinding wheel 5 is formed. The block 1 is formed with an opening rotatably receiving a bushing 6 into which a forwardly and rearwardly movable slide 7 extends, and said block is split at one side of said bushing 6, as indicated at 8, a bolt or the like 9 being provided to contract the block about the bushing and hold the latter against rotation after properly set. The slide is preferably of the cylindrical shape shown, and a key 10 is provided to slidably connect it to the bushing 6 so that holding the latter against turn ing, will also hold the slide.

I have shown a collar 11 releasably clamped around the slide 7 in front of the block 1, and a screw 12 is swiveled in said collar and is threaded through the block for adjusting the slide forwardly or rearwardly, as occasion may demand, when the bolt or screw 9 is loosened. The front end of the screw 12 is preferably provided with a hand crank 13 by means of which it may be easily rotated.

The front end of the slide 7 has been shown as provided with an enlarged split head 14 having an opening 15 in which a vertical post 16 is received for vertical adj ustment and for rotary adjustment. A screw 17 is shown for contracting the head 14 around the post 16, to hold the latter in adjusted position. By loosening the screw 9 and the collar 11, the post 16 may be tilted to any desired extent when making necessary adjustments preparatory to use.

The upper end of the post 16 is split and is provided with an opening 18 which rotatably and slidably receives a horizontal arm 19, a screw or the like 20 being provided to contract the split upper end of the post 16, so as to hold the arm 19 in adjusted position.

Suitable graduations may be provided on any parts which are to be relatively adjusted, to aid in accurately making the necessary adjustments.

supporting block 21 is provided with a horizontal fixed bushing 22 through which the arm 19 passes slidably, a suitable key or the like 23 (Fig. 7) beingprovided to hold said bushing against rotation on the arm 19, so that when the latter is rotatably adjusted in the upper end of the post 16 and locked by tightening of the screw 20, the block 21 is held against vertical swinging. This block is provided with a segmental edge 24, and a bifurcated work-carrier straddles sa d block and is pivotally adjustable along said edge 24. In the present showing, the lower furcation 26 of the carrier 25, is pivoted to the lower side of the block 21, by av screw or the like 27, while the upper furcation 28 lies upon the block 21' and is formed with an elongated recess 29 to receive a die 30 to be ground. A slide 31 has been SlIOWII III the lower portion of the recess 29, said slide having an upstanding pin 32 to abut the die 30 as shown in Fig. 7 so that by adjusting a suitable screw 33 for the slide 31, the latter may be operated to project the die 30 to the proper extent (determined by a gauge hereinafter described). A backup screw 34 is provided for the pin 32, the two screws 33 and 34 being threaded through the rear end of the work-carrier 25. Both of these screws are preferably provided with springs 35 which are held under compression and will consequently hold the screws against accidental release. Either or both screws 33-34 may he used at one time and if desired when using the screw 33, screw 34 may be removed.

A handle 36, is provided for turning the carrier 25 upon the pivot 27, said handle being formed with a threaded front extremity 37 which is threaded into a radial opening 38 formed in the rear end of the carrier 25, in position to allow the terminal 37 to be brought into contact with the segmental edge 24 of the block 21, when desired. Thus, by turning the handle 26 in one direction, the carrier 25 may be held against pivotal movement around the screw or the like 27, while turning of said handle in the other direction will release its extremity 37 from the segmental edge 24, and will permit free swinging of said carrier about the pivot 27. A spring 39 is preferably provided for the handle 36, having the same function as the springs 35 above described.

I have shown a pair of contractible collars 40 and 41 011 the arm 19, to limit the movement of the block 21 upon this arm, the collar 41 being provided with a spring-held adjusting screw 42 for engagement with the block 21 and being equipped with a similar screw 43 to limit the turning of the carrier 25, in one direction.

I have made unique provision for clamping dies of different sizes in the recess 29. The upper furcation 28 of the carrier 25 is provided with a guide groove 44 which opens into one side of the recess 29 and slidably receives a die-clamping jaw 45, the upper side of this jaw being preferably provided with a resillent tongue 46 which extends beyond it to overlie the die 30 and hold it downwardly in the recess 29. The outer end of the jaw is pivotally connected by links 47 with one end of a horizontally movable lever 48 which is fulcrumed between its endson an arm 49 extending from the carrier 25. The other end of the lever 48 is pivoted at 50 to oneend of a handle 51. This handle is in turn pivoted at 52 to a link 53 which extends toward the carrier 25, the inner end of said link bein pivoted at 54 to a plunger 55 which is slidably mounted in the carrier 25, said plunger being provided with a threaded stem 56 and a serrated nut 57 engaged with'said stem. By turning the nut in one direction, the plunger 55 is forced outwardly and thus the opposite end of the lever 48 is forced inwardly, so as to cause the jaw 45 to project further inwardly than otherwise, for clamping a comparatively thin die. Rotation of the nut 57 in the opposite direction. will of course adjust the jaw 45 outwardly. Regardless of the adjustment of this jaw, when it is forced into operative position, by inward swinging of the handle 51 the pivot 52 moves slightly beyond a dead center line passing through the pivots 50.and 54 and thus said jaw 45 is tightly held in operative position.

By making proper adjustments of the device, and properly dressing the grinding wheel 5, the throat 58 of any die 30, may be ground, the handle 36 being then loosened from engagement with the segmental edge 24 of the block 21, so that the carrier 25 may be oscillated horizontally during the grind ing operation. By rigidly holding this carrier upon the block 21, at the proper angle, the face 59 of the (lie may be ground against one side of the wheel 5. When grinding certain forms of metric thread dies, it is necessary to remove the pin 32 and substitute one of smaller size, as will be readily understood by those skilled in the art.

The device may be easily adjusted in any desired-manner and operated with ease, and numerous makes and sizes of dies may be accurately ground. In order to properly set the device for the first die of any set, I prefer to make use of the gauge which is shown most clearly in Fig. 10. This gauge com prises an elongated member 60 having an opening 61 in one end to receive a pin 62 rising from the carrier 25, as shown in Fig. 7-. The other end of the member 60 is formed with an opening 63 into which a pin 64 is detachably threaded. This pin is adapted for engagement with the threadcutting teeth of the die 30 as shown in dotted lines in Fig. 7 when the die is placed in the recess 29, and the opening 61 is placed over the pin 62. The screw 33 is adjusted until the pin 32 comes in contact with the inner end of the die 30, whereupon the backup screw 34 may be threaded into place if both screws are being used. The handle 51 is of course operated to force the jaw 45 inwardly to its operative position. The gauge 60 may now be removed and when the first die is ground, it is taken out of the holder and the second one of the set inserted. This second die and all of the others of a set may be ground without further adjustment of the device.

Itmay here be pointed out that pins 61 of difl'erent sizes are provided to co-operate with the dies which are used for cutting threads on stock of numerous diameters.

The general operation of the invention is as follows :With the collar 40 set rather close to the post 16, and with the yoke 25 swung to the left until it strikes the arm 19, and with the slide? adjusted forwardly to a sufiicicnt extent by means of the" screw 12 and handle 13, place any die of a set in the recess 29, swing the handle 51 until the jaw '25 is just touching the die 30, engage the gauge with the pin 62, and adjust screw or 34, as occasion may dictate until the die 30 strikes the pin 64. The gauge is then removed and the die is tightly clamped by forcing the handle 51 to the left as far as it will go. The block 21 is now slid to the right on the arm 19 until the die 30 is in front of the emery wheel 5 and the collar 41 is adjusted to the proper point on the arm 19, and any minute adjustment required,

may be made by the screw 42. Then, the ha'ndle 13 may be moved to slide the member 7 rearwardly to engage the throat of the die with the grinding wheel 5 and by then loosening the handle 36 and horizontally swmging the yoke 25, it will be seen that this throat will be accurately ground. The movement of the yoke in one direction may be limited by the screw 43, as desired. One die having been ground, the member 21 is slid to the left on the arm 19 after first operating the handle 13 to retract the die from the grinding wheel. The next die of the set may then be inserted.

For grinding the face of one of the dies 30, which is not always necessary when grinding a throat, the member 21 is moved to the left against the collar 40, the die is set forward in the recess 29 by turning the proper adjusting screw, the handle 36 is loosened, and the yoke 25 set at the proper angle, in which position it may be locked by tightening the handle 36, and slide the block 21 to the right until the die 30 touches the side of the grinding wheel 5. The stop collar 41 and the adjustable stop 42 may be used to limit the movement of the block 21 and consequently control the depth of the grinding. When the face of one die is thus ground, the block 21 is moved to the left, the ground die is removed, another is inserted, and the operation is repeated. To grind left-hand dies, reverse the collars 40 and 41 and also reverse the other operations. Whenever making adjustments, the emery wheel 5 should not be in motion.

As excellent results may be obtained from the details above described, these details are preferably followed, but within the scope of the invention as claimed, numerous changes may be made. Also, it may here be stated that if desired, instead of supporting the block 21 and associated parts, the arm 19 may be used, in some instances, to supportother forms of work-holding devices. For instance, the block 22 of my U. S. Patent No. 1,400,762, of Dec. 20, 1921, may be supported on this arm if desired.

I claim:

1. A work holder comprising a main supporting block adapted to be secured to a grinding wheel stand, a horizontally adj ustable slide extending forwardly from said block, a vertically adjustable slide rising from the front end of said horizontally adjustable slide, a horizontal arm extending from the upper end of said vertically adjustable slide for disposition substantially parallel with the grinding wheel axis, a. second supporting block carried by said arm, and a work holder pivoted to said second block for horizontal swinging.

2. A work holder comprising a main supporting block adapted to be secured to a. grinding wheel stand, a horizontally adjustable slide extending forwardly from said block and. having a circular vertically formed opening, a post received in said opening for vertical and rotary adjustments, the upper end of said post having a horizontally formed opening, a horizontal arm received in said horizontally formed opening for rotary adjustment, a second supporting block longitudinally adjustable but non-rotatable on said horizontal arm, and a work carrier pivoted to said second block for horizontal swinging.

3. A work holder comprising a main supporting block adapted to be secured to a grinding wheel stand, a horizontally adjustable slide extending forwardly from said block and having a vertically formed opening, a post received in said opening for. vertical and rotary adjustments, the upper end of said post having a horizontally formed opening, a horizontal arm received. in said horizontally formed opening, a second supporting block having a hOI'lzontally formed opening receiving said horizontal arm. and a work carrier pivoted to said second block for horizontal swinging, said horizontal arm and horizontal openings permitting vertical pivoting of said second block and adjustment thereof toward and from said post.

4. A work holder comprising a body having a work-engaging abutment, a workclamping jaw movable toward and from said abutment, a lever fulorumed between its ends on said body for movement toward and from the same and connected at one end with said jaw, a handle pivoted to'the other end of said lever, and means associated with said handle and body for outwardly forcing the former when swung in one direction, whereby to operate said lever to force said jaw inwardly toward said abutment.

5. A work holder for a grinding machine comprising a supporting'member having a segmental edge, a work carrier said supporting member concentrically with said edge, said carrier having an opening radially disposed with respect to the pivoted carrier, and a handle for freely oscillating said carrier during one grinding operation, said handle having one end threaded in said opening and adapted to bind against said segmental edge when the handle is rotated is one direction, whereby the carrier may be rigidly held with respect to said supporting member to perform another grinding operation.

6. A work holder comprising a supporting member having a segmental edge, a, bifurcated work carrier whose furcations straddle said supporting member, means pivoting one of said furcations to said supporting member, work holding means associated with the other of said furcations, and an operating handle for said work holder having an end threaded through the intermediate portion of said holder and adapted to bind against said segmental edge when desired.

7 A work holder comprising a supporting member, a bifurcated work carrier whose furcations straddle said supporting member, means pivoting one furcation to said supporting member for swinging movement, the other furcation having a work receiving recess, and means for holding the work in said recess.

8. A work holder comprising a body having a work receiving recess, a work clamping jaw at one side of said recess, a lever fulcrumed between its ends on said body for movement toward and from the same and connected at one end with said jaw, a handle pivoted to the other end of said lever, and means associated with said handle and body for outwardly forcing the former when swung in one direction, whereby to operate said lever to force said jaw inwardly.

9. A work holder comprising a body having a work rece ving recess, a work clamping jaw at one side of said recess, a lever fulcrumed between its ends on said body for movement toward and from the same and connected at one end with said jaw, a handle pivoted to the other end of said lever, and a link pivotally carried by said body and pivoted at its outer end to said lever, the pivot connecting said link and lever being movable beyond a dead center line intersecting the pivotal connection bepivoted to tween the link and body and the connection between the handle and lever, when said handle is operated to cause the lever to force beyond the inner end of said jaw to yieldably engage the work.

12. A work holder comprising a body having a work receiving recess, a work adjusting slide at the bottom of said recess having a pin to abut the work, and a back-up screw for said pin threaded through said body.

13. A work holder comprising a body having a work-engaging abutment, a workclamping jaw movable toward and from said abutment, a lever fulcrumed between its ends on said body for movement toward and from the same and connected at one end with said jaw, a handle pivoted to the other end of said lever, and a link pivotally carried by said body and pivoted at its outer end to said lever, the pivot connecting said link and lever being movable beyond a dead center line intersecting the pivotal connection between the link and body and the connection between the handle and lever, when said handle is operated to cause the lever to force inwardly on said jaw.

14. A structure as specified in claim 13; together with means for outwardly or inwardly adjusting the pivotal connection between the link and said body to vary the inward movement of said jaw.

15. The combination with a grinding wheel having a flat side and a rounded edge: of a holder for a thread cutting die spaced outwardly from said rounded edge, and. adjusting and mounting means for said holder permitting the throat of the die to be positioned against the rounded edge of the grinding wheel and also permitting one flat side of the die to be disposed against the flat side of the wheel, said mounting and adjusting means for the die holder including means whereby said holder may be oscillated when the die is in one position with respect to the grinding wheel but rigidly held when the die is in its other position.

In testimony whereof I have hereunto affixed my signature.

THOMAS B. MURPHY.

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