US2801860A

US2801860A - Double-acting spring for pin drive and clutch drive counterbores

Info

Publication number: US2801860A
Application number: US619305A
Authority: US
Inventors: Sidney A Getts
Original assignee: METAL CUTTING TOOLS Inc
Current assignee: METAL CUTTING TOOLS Inc
Priority date: 1956-10-30
Filing date: 1956-10-30
Publication date: 1957-08-06
Anticipated expiration: 1974-08-06

Description

5 s. A. GVETTS 2,801,860

- DOUBLE-ACTING SPRING FOR PIN DRIVE AND CLUTCH DRVIVE CQUNTERBORES I Filed Oct. :50, 1956 J orhemf- United States Patent ouana-aernseisrnns FOR rTINDRtv N CLUTCH DRIVE COUNTERBORES Sidney A;Gotta-"Rb ckforifl, Illt,ass'ignor-to Metal Cutting Tools, Inc, Rockford, Ill., acorporation of lllinois Application Oc'tdberfil), 1 956, Serial-No. 619,305

-'9'-Ciinis. (G1. 279- 97) The present invention relates to-a double-acting spring "forlpin 'driveandclutch drive counterbores for retaining the cutterby the fiat portion on the-shankthereof, within theholder hereinafter described and claimed.

Thea-principal objectof this-invention is to provide a spring means for securely looking a cutting tool in the socket of t the tool holder-againstaccidental release either 1 type, acon'struction which is expensive and whichcannot be -'depended upon under conditions of 1 use.

Other obj'ects will appear hereinafter throughout the specification.

In the drawings:

Figure 1 is a longitudinal vertical sectional view through a boring tool and its holding socket, with parts in elevation;

Figure 2 is a transverse vertical section taken on the line 2-2 of Figure 1;

Figure 3 is a transverse vertical section taken on the line 3-3 of Figure 1;

Figure 4 is a transverse vertical section taken on the line 4-4 of Figure 1;

Figure 5 is an exploded view of the tool holder and tool, together with the spring and pin for holding with the latter within the former; and

Figure 6 is the spring blank from which the doubleacting spring is formed.

The present invention comprises a double-action spring of general circular configuration having inturned ends, having an ear which is bent on a ditferent radius from other portions of the spring. This ear acts as a tension spring on the fiat portion of the cutter, and when engaged therewith prevents the cutter from dropping out of the holder before it is engaged by the pin. The main or circular portion of the spring acts as a friction drag against the circular recessed walls of the holder, and this spring is so constructed that it turns more freely in a clockwise direction than it does in a counter-clockwise direction. As the cutter is turned clockwise on the pin, such turning also rotates and maintains a pressure against a flat portion of the cutter, thereby holding the cutter within the holder. The construction is such that greater pressure is required to remove the cutter from the holder than is necessary to engage the cutter with the holder.

Referring to the drawings, the numeral 10 indicates the tool or driven member, the same being provided with a circular shank 12 having a flat or key portion 14 thereon including a bayonet groove, the key portion and bayonet groove forming a key means. As shown in Figure 1, the drill or driving member, tool holder 16 has a longitudinal cylindrical recess 18 for the reception of the shank 12, it being noted that the entire recess is not occupied by the 2,801,860 "Fatented Aug. 6, 1957 2. .pin, there being a cylindrical space 20 when the pin is in fpla'ce on the holders The holder 16 is .provided with theusual transverse passageway or'keyway l z for the reception of thelpin or key 24 which engages the bayonet groove 37 whereby to (prevent relative rotation between the drill and the drill holder when the parts arein theposition shown linFigure 4.

, Mounted within :the space 20 is the double-acting spring 26, this being formed from the blank shown in Figure 6.

The spring blank shownin Figure .6 is "formed into a C-shaped form, as sh'own in the other figures, the natural tendency of the spring being to expand and thereby frictionally engage the walls of the longitudinal cylindrical recess 18. This frictionalengagement will prevent the spring from falling out of the recess. This spring is pro vided with confronting

end portions

28 and 30, each having an aperture and 34 for the reception of a suitable "tool for removing the spring from therecess 18.

The spring is .provided adjacent confronting end portion 28 with an extension or car 36. This: ear is bent .on a different angle from the confronting end portions whereby it :will .bear against the Hat portion 14 of the cutter. The ear 3fi has a spring action of its own to therebyfrictionally engagethe said flatport-ion. iIt thuspreverits-theputterfrom dropping out of the holder 16 before the pin 24 has been fixed in position in passageway 22, as shown in Figure :4.

harder the spring 26 is "first positioned within the recess 18 by means of a suitable tool, not shown, which will contract the cylindrical surface of the spring so as to permit its insertion within the said recess, as shown in Figure l. The tool shank 12 is next inserted within the recess, following flat portion 14 positioned under pin 24, the flat portion 14 engaging the car 36, as shown in Figure 3. The clockwise rotation is started, the parts being relatively rotated until bayonet groove 37 is engaged with the pin 24. As previously stated, the circular or main portion of the spring acts as a friction drag against the inner walls of the holder. When it is desired to remove the tool from the holder, these operations are reversed.

It will be noted that during all of the time the tool is within the holder the ear 36, due to the fact that it is biased toward the flat portion 14, frictionally engages this portion and thereby prevents the tool shank from moving out of the holder recess. It will be noted that the spring 26 and its ear 36 provide a double action spring effect, the circular portion frictionally engaging the internal walls of the recess 18 while the ear 36 frictionally engages the fiat portion 14 of the tool, both being biased spring actions.

It will be obvious to those skilled in the art that various modifications may be made in the invention without departing from the spirit and scope of the appended claims.

What is claimed is:

1. In a coupling comprising a driving member having a longitudinal recess and a transverse key passageway, a driven member having a shank extending into the longitudinal recess of said driving member, said shank having a key means thereon, a key extending through said transverse passageway and engaging said key means of said driven member, and circular spring means having a portion frictionally engaging the walls of said longitudinal recess, said spring member having an ear frictionally eninto the longitudinal cylindrical recess of said driving member, said shank having a key means thereon, a key extending through said transverse passageway and engaging said key means of said driven member, and circular spring means having a portion frictionally engaging the walls of said longitudinal recess, said spring member having an ear frictionally engaging the key means of said driven member.

3. In a coupling comprising a driving member having a longitudinal recess and a transverse key passageway, a driven member having a shank extending into the longitudinal recess of said driving member, said shank having a key means comprising a flat portion and a bayonet groove thereon, a key extending through said transverse passageway and engaging said bayonet groove of said driven member, and circular spring means having a portion frictionally engaging the walls of said longitudinal recess, said spring member having an ear frictionally engaging the flat portion of said key means.

4. In a coupling comprising a driving member having a longitudinal cylindrical recess and a transverse key passageway, a driven member having a shank extending into the longitudinal cylindrical recess of said driving member, said shank having a key means comprising a fiat portion and a bayonet groove thereon, a key extending through said transverse passageway and engaging said bayonet groove of said driven member, and circular spring means having a portion frictionally engaging the walls of said longitudinal recess, said spring member having an ear frictionally engaging the flat portion of said key means.

5. In a drill assembly comprising a holder having a longitudinal recess and a transverse key passageway, a driven member having a shank extending into the longitudinal recess of said driving member, said shank having a key means thereon, a key extending through said transverse passageway and engaging said key means of said driven member, and circular spring means having a portion frictionally engaging the walls of said longitudinal recess, said spring member having an ear frictionally engaging the key means of said driven member, a tool hav ing a shank adapted to said recess, said shank having a flat portion, and said holder having a key adapted to engage said fiat portion, said spring means further including a C-shaped spring member, said spring member being biased to engage the walls of said longitudinal recess.

6. The structure of claim 5 wherein said C-shaped spring member has confronting end portions.

7. The structure of claim 5 wherein said C-shaped spring member has confronting end portions and a flat portion.

8. The structure of claim 5 wherein said Cshaped spring member is provided with confronting end portions, said end portions having perforations for the reception of a tool whereby to insert and remove said spring from said longitudinal recess.

9. The structure of claim 5 wherein said C-shaped spring member is provided with confronting end portions, said end portions having perforations for the reception of a tool whereby to insert and remove said spring from said longitudinal recess, said spring member having a flat portion.

References Cited in the file of this patent UNITED STATES PATENTS 1,525,471 Stevens Feb. 10, 1925 1,701,631 Slater Feb. 12, 1929 1,757,444 Stevens May 6, 1930 2,512,149 Gartin June 20, 1950