US1306039A

US1306039A - Toojl-holdeb

Info

Publication number: US1306039A
Authority: US
Publication date: 1919-06-10
Anticipated expiration: 1936-06-10

Description

` J. K. TUFTS.

TOOL HOLDER.

APPLICATION HLED MAY 31. 1917.

Patent@ June A10, 1919.

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J. K. TUFTS.

TOOL HOLDER.

APPLICATION HLED MAY 31. lsu.

1,306,039. Patented June 10, 1919i.

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JAMES K. TUFTS, OF BOSTON, MASSACHUSETTS.

ilf l Toon-HOLDER.

Specification of Letters Patent.

Patented J une 10, 1919.

Application led May 31, 1917. Serial No. 171,810.

T o all whom t may concern:

Be it known that I, JAMES K. Tnr'rs, a subject of King George V of England, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Tool- Holders, of which the following is a specilication.

This invention relates to an improved tool holder to be used in connection with the tool post of a lathe, planer or Shaper. The cutting tools of metal are made of very expensive steel and it is the object of this invention to provide a holder for such tools which will firmly clamp a small piece of steel, formed as a cutter, to a holder such as is practicable in form and size to be used in connection with the tool post of a lathe, planer or Shaper.

It is further the object of this invention to provide a device of the character set forth in which the tool is clamped to the holder in such a manner as not to injure the same by cracking it or by causing it to be crystallized at certain portions thereof so that it will break when pressure is applied thereto.

The invention consists in a tool holder having a recess therein adapted to receive a tool and certain specific means for firmly clamping either a short or long tool to said holder, as set forthy in the following specification and particularly pointed out in the claims.

The invention further consists of a device of the character set forth in which the holder is so mounted that it can be rotated so as to place the tool holder thereof at different angles according to the nature of the work being performed.

The invention still further consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

In the accompanying drawings I have illustrated several forms embodying my invention, all of said forms, however, containin the same fundamental principles and il ustrating the different ways in which' my invention may be used to suit varying classes of work.

Referring to the drawings:

Figure 1 is a side elevation of one embodiment of my invention, the same being particularly adapted to be used in connection with the tool post of a lathe.

Fig. 2 is a plan view of the same.

Fig. 3 is aside elevation of another embodiment of my invention, also adapted to be used in connection with the tool post of a lathe. Fig. 4 is a plan view of that form of my invention illustrated in Fig. 3.

Fig. 5 is a side elevation of another embodiment of my invention which is adapted to be used particularly in connection with the tool post of a planer or Shaper.

Fig. 6 is a plan view of the form of my invention illustrated in Fig. 5.

Fig. 7 is a side elevation of another embodiment of my invention illustrating the tool holder rotatably mounted upon a supporter which is adapted to be used in connection with the tool post of a planer or shaper. n

Fig. 8 is a plan view of the form of my invention illustrated in Fig. 7.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, referring to Figs. 1 and 2, 10 is the holder, and 11 the tool which projects into a hole 12 in which it forms a sliding fit. The hole 12 extends longitudinally through the holder at an angle thereto and is intersectedby a slot 13 which extends at an acute angle to said hole 12 and in which is located a clamping lever 14 pivoted to the holder' 10 by means of a pivot 15. A screw 16 has screw-threaded engagement with the lever 14 and the inner end thereof projects into a recess 17 formed in the bottom of the slot 13, the metal in the immediate vicinity of said recess being hardened. f

It will be noted that the inner'end of the screw 16 bears against a 'portion of the holder 1() which projects between the bottom of the slot 13 and the top of the hole 12, so that whether the piece forming the tool 11 is long enough to extend entirely through the hole 12, or only a very short distance into said hole, the screw 16 will bear against said portion of the holder 10, and will clamp the tool, whether long or short, into the hole 12 under exactly the same conditions.

It .will be noted that the clamp lever 14 has one edge 18 thereof arranged to contact with vthe tool 11 on both sides 0f a plane A-A which extends transversely of the tool 11 and hole 12 and at right angles to the bottom of said hole and passes through the median axial line of said pivot 15, so that said edge 18 bears along the upper edge of the tool 11 from the front of the holder 10 to and beyond the plane A-A, and consequently it will llle.56.6.1.15011.313 When the screw 16 is operated to rock the clamp lever 14 upon its pivot 15, it will .bear

against the upper edge of the tool 11 for a substantial distance from ,the plane A-A and will have'no tendency to nick or crystallize said tool to make it crack. Moreover, if the tool 11 is very short, the edge 18 of the lever 14 will have a firm hold and comparatively long bearing thereon.

It will be seen lthat as the lever 14 is operated, as hereinbefore set forth, to clamp the tool in the holder, the'portion of the edge 18 in'nnediately adjacent to the plane A-A will act ,as a wedge between the pivot 15 and the tool 11 to vfirmly clamp said tool to the holder and that any force exerted upon the tool 11 during its operation in cutting metal which tends to'force said tool backwardly vin the hole 12 will cause the clamping Vaction of the lever 14 to be increased `and the tool to be thus still more firmly .held and clamped within the ,holder 10.

The edge 19 of the lever 14, it will be seen, extends at an angle to the edge 18 of said lever and along adjacent to the b ot-l tom of the slot 13, so that there is vopportunity for a substantial amount of metal of lthe holder 10 to project between the bottom edge 19` of the lever 14 andthe top edge of the hole 12, so that a substantial and strong base isprovided against which the screw 16'V bears. j

The operation of the tool is as follows; The holder 10 isinserted in the tool post of a lathe in the usual manner. The'tool'll v is placed'in the hole 12 and is lampedztherein by means of the lever 14 and clamping screw 16. Turning said screw to advance the same causes the lever 14 to clamp the tool in the hole 12 and vice versa.

Now referring to Figs. 3 and 4, 2O is the holder, 21' vthe tool, 22 the hole in which said tool is seated, 23 the slot for the clamping lever 24, which lever is pivoted at 25`and is tipped upon said pivot by a clamping screw 26, the lower end of which bearsl against a` recess 27 in the holder 20. The edge (28. bears against the tool 21 and the edge 29 of said lever stands at an angle to the edge 28 andy at a slight distance from the bottom of the slot 23. In this embodi-` ment of my invention it will be seen that the edge 28,'which contacts with the tool 21, extends on oppositel sides of aplane B which stands at right angles to theedge of the tool 21 and contains'the median axial line, of: the pivot 25.

In the form of my invention illustrated in Figs. 5 and 6, 30-y is the'holder,31 the tool, 32 the hole in which said tool is seated, 334 .the slot in which the lever 34 is located. 35 is the pivot lof said, lever 34, 36 the 4the kedge .of .the .lever which bears against the

tool

31 and 39 the edge of said lever which extends at an angle to the edge 38 and adjacent to the bottom of the slot 33.

4It will be noted that the plane C which contains the median axial line of the pivot 35 intersects the contacting edge 38 of the lever 34 at a substantial distance from the point where the'tool projects from the front of the holder 30.

In Figs. 7 and 8 a modified ferm of my invention is embodied in which the tool holder' is rotatable so that the tool may be presented at different angles to the work. In this embodiment of 'my invention 40 is the holder, 41 the tool, 42 the hole in ,which said tool is seated, 43 the slot in which -the clamp lever 44 is located, said clamp lever being pivoted at 45 tothe holder 40. '14,6 is the clamp screw which tips the holder upon its pivot in order that the edge 48 of said levermay bear Vagainst the edge of the tool 41 andclamp the vsame in the holder. It will be noted that the edgel 48 stands at an angle to the Iedge .49 ofsaid lever.l 4

The holder 40 has `a shank .540 which is rotatably mounted in a supporting member 51, the Ishank 52 of said snpport'ingmenr ber projecting into the tool post of a planer or Shaper in the usual manner. Said ktool holderf40 is locked in position by means of'a pin 5,3 which projects into any one of the recessesv 54 provided in the upper edge ofthe boss 5,5 of the supporting" member 51 and is clamped in 'position by means of nut 5 6 having screw-threaded engagement with the ,shank 50.., v

vThe general operation of the diii-erent embodiments of my invention is substantially the same, except that in the form of my invention illustrated vin Figs. Z and 8 the tool can beset at,k dierent angles tothe snpporting member 51 while'the supporting member remains in thetool post, Having thus described .'my invention, what I claim and desire by Lettersl Patent to secure is: A 1. A tool holder having, in combination, a holding member having a .recess therein adapted to receive a tool', saidV holding member also being provided with a slot'intersecting said recess, a clamping lever located in said slot pivoted to said holding member j and arrangedto bear against a tool located a holding member having a hole extending' therethrough adapted to receive al tool', said holding member also being. provided'y with a slot intersecting said hole, a portion of said holding member projecting lbetween said hole and slot and forming the bot-tom of said slot, a clamping lever located in said slot pivoted to said holding member and arranged to bear against a tool located in said slot and a screw having screw-threaded engagement with said lever and adapted to bear against said portion of said holding member which forms the bottom of said slot.

3. A tool holder having, in combination, a. hole extending therethrough adapted to receive a tool, said holding member also being provided with a slot intersecting said hole, a portion of said holding member proj ecting between said hole and slot and forming the bottom of said slot, a clamping lever located in said slot pivoted to said holding member and arranged to bear against a tool located in said slot and a screw having screw-threaded engagement with said lever and adapted to bear against said portion of said holding member projecting between said hole and slot, said holding member having a recess therein into which the end of said screw is adapted to project.

4. A tool holder having, in combination, a holding member having a recess therein adapted to receive a tool, said holding member also being provided with a slot intersecting said recess, a clamping lever 1ocated in said slot, Aa `pivot connecting said clamping lever to said holding member, one edge of said clamping lever adapted to contact with a tool located in said recess from the front end of said hole to the point in said hole nearest said pivot.

5. A tool holder having, in combination, a holding member having a recess therein adapted to receive a tool, said holding member also being ,provided with a slot intersecting said recess, a clamping lever located 'in said slot and pivoted to said holding member, said clamping lever having one edge thereof arranged to contact with said tool for a substantial distance and another edge thereof eXtendin at an angle to said contacting edge and a jacent to the bottom of said slot and a screw having screwthreaded engagement with said lever and adapted to bear against the bottom of said slot.

6. A tool holder having, in combination,

a holding member having a recess therein adapted to receive a tool, said holding member also being provided with a slot intersecting said recess, a clamping lever located in said slot and pivoted to said holding member, said clamping lever having one edge thereof arranged to contact for a substantial distance with a tool located in said recess and another edge thereof extending at an angle to said contacting edge and adjacent to the bottom of said slot and a screw having screw-threaded engagement with said lever projecting through said lastnamed edge and adapted to bear against a portion of said holding member located between said lever and said recess.

7. A tool holder having, in combination, a holding member having a recess therein adapted to receive a tool, said holding member also being provided with a slot intersecting said recess, a clamping lever located in said slot, a pivot connecting said clamping lever to said holding member, said clamping lever having one edge thereof arranged to contact with a tool located in said recess for a substantial distance from the front end of said recess toward a plane eX- tending transversely of and at right angles to the bottom of said recess and containing the median axial line of said pivot and a screw having screw-threaded engagement with said lever and adapted to bear against the bottom of said slot.

8. A tool holder having, in combination, a supporting member, a holding member rotatably mounted upon said supporting member, ber to said supporting member, said holding member having a recess therein adapted to receive a tool and being also provided with a slot intersecting said recess, a clamping lever located in said slot pivoted to said holding member and arranged to bear against said tool and a screw having screwthreaded engagement with said lever and adapted to bear against said holding member outside said recess.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JAMES K. TUFTS. Witnesses:

CHARLES S. GooDINe, SYDNEY E. TAr'r.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, I). C.

means to lock said holding memf