US1910296A

US1910296A - Punch retainer mechanism

Info

Publication number: US1910296A
Application number: US339145A
Authority: US
Inventors: Floyd C King
Original assignee: GUARDIAN TRUST Co
Current assignee: GUARDIAN TRUST Co
Priority date: 1929-02-11
Filing date: 1929-02-11
Publication date: 1933-05-23
Anticipated expiration: 1950-05-23

Description

May 23, 1933 PUNCH RETAINER MECHANISM Filed Feb. 11, 1929 2 Sheets-Sheet 1 5 22 2 25 I, A 22 .3 3/ Z8 7 y Ki}. 5/ I m I g A L 7; @2.

NNNNNN OR 1'! JCT/(2'7; BY ALJZQ mm MM ATTORNEY May 23, 1933. Km 1,910,296

PUNCH RETAINER MECHANISM Filed Feb. 11, 1929 2 Sheets-Sheet 2 "[29 czar/Z7? I 5 BY ll a L ATTORNEYS Patented May 23, 1933 UNITED STATES PATENT- orrlcs FLOYD C. KING, F BIBKINGHAI, IIIGE IGANQABSIGNOB '10 GUARDIAN TRUST COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION 01' MICHIGAN, TRUSTEE PUNCH RETAINER MECHANISM Application'fllefl February 11, 1928. Serial 80.339445.

This invention relates generally to tool holders, especially punch and die retainers, and consists of certain novel features of construction, combinations and arrangements of parts that will be hereinafter more fully described and particularly pointed out in the appended claims.

In the accompanying drawings,-

Fig. 1 is a vertical sectional view thru a punch and die and retainers therefor illustrating the means for securing a punch or die in the respective retainer; Fig. 2 is a detail view of one of the retaining cams;

Fig. 3 is a detail view of one of the shells; Fig. 4 is an enlarged fragmentary sectional view of the punch;

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 4; h

Fig. 6 is a side fragmentary elevation of the construction shown in Figure 4;

Fig. 7 is a fragmentary vertical sectional view thru a modified construction;

Fig. 8 is a bottom plan view of the lowermost body illustrated in Fig. 7. Fig. 9 is a diagrammatic view. Referring now to the drawings,-1 is a punch having suitable shank and work engaging head portions, 2 and 3 respectively, 30 4 is a body constituting a holder for punches and the like having a bore 5'for receiving the shank 2 of the punch and having a pocket or recess 6 at one side of the bore containing means for retaining the shank 2 in the

bore

5, 7 is a die having a substantially fiat upper face 8 constituting a seat for the work 9 and having a longitudinally extending bore 10 for receiving the work engaging head 3 of the punch, and 11 is a body constituting a holder for dies and the like having a bore 12 for receiving the die 7 and having a recess 13 at one side of the bore similar to the recess 6 in the. holder 4 and containing means similar to the means in the pocket 6 for retaining the die 7 in the bore 12. As shown the means in the recess 6 in the holder 4 for retaining the punch shank 2 in the bore 5 comprises a lever 14 having a rounded or spherical end portion 15 pivotally engag- .ing a roundedportion 16 of the recess'6 and base 18 of an arcuate recess 19 in one side of the punch shank 2, a coil spring 20 engaging the lever 14 and normally holdin the arcuate end portion 17 thereof in the ore 5, and a shell 21 that constitutes a housing for the spring 20 and for the spherical end portion 15 of the lever and that prevents accidental displacement of the said spherical portion 15 from the rounded portion 16 of the recess 6. Preferably, the metal upon opposite sides of the arcuate recess 19 is cut away as illustrated at 19' in Figures 5 and 6 to facilitate the removal of the lever 14 from the recess. Thus, by cutting away portionsas at 19' upon opposite sides of the re- 7 cess burrs are not apt to be formed in the metal as a result of the constant or=repeated action of the punch and holder while in use, since suflicient clearance is provided by the cut-away portions 19' to com nsate for this.

The rounded portion 16 o the recess 6 is concentric with the center 22 of the spherical portion 15 and constitutes a hacker or hear ing for said spherical portion in all positions of pivotal adjustment of the lever. In fact, the arrangement of the spherical and

rounded portions

15 and 16 respectively is such that the s herical portion 15 slidably engages the roun ed portion 16, and the outer free end of the lever is so fashioned with respect to the base 18 of the recess 19 in the punch that the longitudinal thrust imparted to the lever when the free end thereof is engaged with the base 18 of said recess is transmitted directly from the spherical rtion 15 to the rounded portion 16. There ore, as thelever swings in an arc the spherical portion 15 will transmit this thrust or load correspondingly different points of the rounded portion 16. Moreover, due to this arrangement of the spherical and rounded portions, the outer free end of the lever may be so fashioned that the punch will be effectively held by the lever acting as a prop or brace and may be easily and quickly released from the lever and removed from the body 4 as will be hereinafter more fully set forth. 7 V Preferably the arcuate end portion 17 is Figure 1 representing an arc concentric with the center 22. Hence, when the arcuate end portion 17 engages the base 1.8 of the recess in the tool shank 2, a propping or bracing action in contradistinction to a wedging action, and an area contact instead of a point contact is obtained.

In use, the arcuate end portion 17 will normally be held by the spring 20 in the bore 5 but when the shank 2 of the punch is inserted in the bore 5, the arcuate end portion 17 of the lever will automatically engage the base 18 of the recess 19 in the shank 2 and will effectively hold the punch in assembled position. However, any suitable means such as the shank 50 of a tool 51 may be inserted thru a bore 25 into the recess 6 to disengage the lever 14 from the shank 2. Likewise a lever 30 in the holder 11 may be utilized to hold the die 7 in the bore 12 in the holder and may be disengaged from the die by the insertion of the tool shank 50 thru a bore 31 in the holder 11.

Thus, with in construction a tool may be readily removed from a holder without the necessit of taking apart the holder or separating it from the usual backing plate 40. Moreover, a better gripping action is obtained and there is no tendency of the parts to wedge.

It will also be noted that with my construction the relationship of the retaining means to the punch or tool is such that the punch or tool is always held in proper registration and position with respect to the cooperating die so that when thepunch head is lowered into operative engagement with the work the said head will always register properly with the punch head receiving aperture or bore 10 in the co-operating dies. This is true irrespective of the construction or formation of the punch head or tool.

In Figures 7 and 8 are shown a slight modification in which two

holder bodies

30 and 31 are secured by bolts 32 in superposed relation and are provided with bores for receiving a plurality of punches 1. As shown the holder body-30. is provided with a series of bores 33, arranged in the arc of a circle about a central bore 34, the central bore 34 being in alignment with a similar bore 35 in the holder body 31. lVith this construction the retaining means for the respective punches in the body 30 can be located in recesses 36 at one side of the. respective bores 33 in said body. and the retaining means for the punch in the bore 34 may be received in a similar recess 37 at one side of the bore 35 in the body 31, the shank 38 of the center punch having an extension 38 for this purpose and having the arcuate recess 39 thereof in said I extension to be engaged by the cam 40 of the retaining means in the recess 37. Thus, with this construction a series of punches may be arranged relatively close for forming a series of holes in the work.

While it is believed that from the foregoing description the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall within the scope of what is claimed.

What I claim as my invention is:

1. In combination, a tool, a holder therefor having a body provided with a'bore for receiving the tool and having a recess at one side of said bore, means for limiting the insertion of the tool in said bore, and means operable automatically upon insertion of the tool in one direction into the bore to engage and hold said tool against said limiting means, including an elongated member having a spherical end portion journalled in the recessand having an arcuate portion at 3 for having a body provided with a bore for receiving the shank of a punch and having a pocket at one side of said bore provided with a rounded face, means for limiting the insertion of the shank in said bore and means operable automatically upon insertion of the shank of the punch in one direction into the bore to engage and hold said shank against said limiting means including an elongated member having a rounded end engaging the rounded face and having an arcuate end portion engageable with a correspondingly curved surface of the shank.

3. In a tool holder, a body having a bore for receiving the shank of a punch, and an elongated member extending through a wall of the bore at substantially an acute angle thereto, one end of the. member being spherical and having a rocking engagement with the body. and the other end of said member being substantially arcuate shape with the are eccentric to the spherical portion aforesaid and adapted to engage and hold a shank in the bore.

4. In a tool holder, a body having a bore for receiving the shank of a punch and having a recess at one side of the bore, and an elongated member adjustable in the body, having a rounded end portion in the recess and having a rounded end portion in the bore, a portion of the recess being eccentric with and serving as a bearing for the first named rounded end portion aforesaid in positions of adjustment of said lever.

5. In combination, a tool, a holder therefor having a body rovided with a bore for receiving the too means for limiting the insertion of the tool in said bore and means operable automatically upon the insertion of the tool in one direction into the bore to engage and hold said tool against said limiting means including an elongated member having a spherical end portion bearing against a portion of the body and having a rounded end portion for engagement with the tool.

6. In a tool holder, a body having a bore for receiving a tool and having a recess at one side of said bore provided with a rounded portion at the rear thereof, and means for holding the tool in said bore including an elongated member having a spherical portion bearing against the rounded portion of said recess and having a rounded end portion eccentric with the center of the said spherical portion and adapted to engage a tool in the ore.

7. In combination, a tool, a holder therefor having a body provided with a bore for receiving the tool having a recess at one side of the bore, means for limiting the insertion of the tool in said bore, and means operable automatically upon the insertion of the shank of the tool in one direction into the bore to engage and hold said tool against said limiting means including an elongated member having a spherical end portion bearing against a wall of said recess and having a rounded end portion in the bore for engagement with a tool, yieldable means normally holding the rounded end portion in said bore, and a housing for the yieldable means enclosing a portion of the member and preventing accidental displacement of the spherical portion from the wall aforesaid of said recess.

8. In combination, a tool holder having a body provided with means for receiving a punch, and means associated with said body for holding said punch in said receiving means, including an elongated member having a. spherical end portion journaled in the body and having a rounded end portion eccentric to the spherical portion, and a punch having a shank in said body provided with a segmental recess receiving the rounded end portion of said member, the base of said recess being concentric with the rounded end portion aforesaid but eccentric to the spherical portion of said member.

9. In a tool holder, a body having a bore for receiving the shank of a punch and having a pocket at one side of the bore provided with a rounded face, and an elongated member having a rounded end engaging the rounded face and having an arcuate end portion engageable with a correspondingly curved surface of said shank, the rounded face aforesaid being eccentric with respect to the arcuate end portion of the elongated member whereby the latter may be readily dislodged from said shank.

10. In combination, a tool, a holder therefor having a body provided with a bore for receiving the shank of the tool and having a recess at one side of said bore, and means for holding the shank in said bore. including an elongated member having a spherical end portion journalled in the recess and having an arcuate portion at its free end engageable with an arcuate recess in the shank, said arcuate end portion and recess having their respective centers of curvature close to the center of said spherical end thereby providing for ready engagement and disengagement of said member with said recess without longitudinal movementof the tool.

11. In combination, a tool, a holder therefor having a body provided with a bore for receiving the shank of a punch, means for limiting the insertion of the shank in said bore, said shank being insertible in and removable from said body through one end of the bore, said body having a pocket at one side of the bore provided with a rounded face, and an elongated member having a rounded end engaging the rounded face and having an arcuate end portion engageable with a correspondingly curved surface of a shank.

' 12. In a tool holder, a retainer 4 having a bore 5 therein for receiving the shank 2 of a tool, said bore being closed at one end and providing means 40 for applying axial pressure to said tool, said tool being insertible in and removable from said retainer through the open end of said bore, a pocket 6 in said retainer in communication with said bore 5 and having a rounded seat 16, an elongated locking member 30 having a rounded end 15 engageable with said seat and an opposite arcuate end 17 engageable with a correspondingly curved surface 18 of said shank, spring means 20 within said pocket engaging sai member and normally holding the end 17 of said member in said bore, the radius of ourvature of said end 17 being greater than that of the other end 15 whereby axial pressure or stress applied to said tool will cause said member to grip and hold said tool securely in said retainer.

13. A tool holder as defined in claim 12 wherein the arcuate end 17 is eccentric to the rounded end 15 so that the member 30 may freely be released from engagement with the shank of the tool manually by means of a releasing tool insertible through an opening 25 communicating with said pocket.

14. In a tool holder, a body having a tool receiving bore closed at one end and open at the other, and means at one side of the bore operable automatically upon insertion of a tool into the bore to engage and hold said tool against movement, including an elongated member having one end thereof mounted for pivotal movement in the body and having its able means urging said elongated member other end free and operable to hold a tool into said tool aperture into holding engage against the closed end of the bore. ment with a tool therein.

15. In a tool holder, a body having a bore In testimony whereof I aflix my signature.

5 therein closed at one end and opening through FLOYD C. KING. I

a face of the body for the reception of a tool, means operable automatically upon insertion of a tool into the bore to engage and hold said tool against movement, including an elongated member operable to hold the tool against said closed end, said member having one end thereof mounted for pivotal movement in the body at one side of the bore and having its other end free and movable into 15 the bore for engagement with a tool therein, I I

and yieldable means within the body urging the free end of said member into the bore for engagement with a tool therein.

16. In combination, a tool, a holder for the 20 tool having a body provided with a bore for receiving the tool and having a recess at one side of said bore, means for limiting the insertion ofthe tool in said bore, means for holding said tool against movement in the bore including an elongated member having. a spherical end portion journaled in the recess and having its other end free and urging the tool against said limiting means, and yieldable means within the body constantly engaging said elongated member and urging the free end aforesaid of the latter into holding en agement with the tool within the bore. 17 n a tool holder, a body having a tool receiving bore and provided at one side of 35 the bore with a recess having a curved portion, means for limiting insertion of a tool in said bore, and means operable automatically upon insertion of a tool into the bore to engage and hold said tool against movement in the bore, including an elongated propping member urging the tool against said limiting means, said member having a rounded lower end slidably engaging the curved portion aforesaid of the recess in the body and having its other end free and movable into the bore for engagement with a tool j therein, the free end of said member having a portion for engagement with the base of a recess or groove in a tool in the bore.

18. In a tool retainer, a retainer member having a tool aperture closed at its upper end and open at its lower end, said retainer member being provided at one side of the aperture with a recess that opens into the same and is provided with a spherical seat, and means operable automatically upon insertion of a tool upwardly into the aperture to engage and hold the tool against movement in the aperture including an elongated member operable as a prop for holding the tool against said closed upper end, said member having a spherical end engaging said spherical seat, the free end of said elongated member being movable into thetool aperture into and out of engagement with a tool therein, and yield-