US3262297A - Flaring and burnishing tool - Google Patents

Description

July 26, 1966 A, SAMUELS ETAL 3,262,297

FLARING AND BURNISHING TOOL Filed Feb. 4, 1964 7 ,fzzu 622250115 flram Mszmueis' Kzgegge 5 $@P0 v M a z United States Patent This invention relates to improvements in a flaring and burnishing tool.

One of the objects of this invention is to provide a flaring and burnishin-g tool which is highly efficient in operation and economical to produce.

Another object of this invention is to provide a tool which will perform the flaring operation on the forward axial and rotative movement of the cone and will automatically maintain the cone in engagement with the flared tube end during the return or rearward axial and rotative movement of the cone to perform the burnishing operation.

Another object of this invention is to provide a tool of the foregoing character utilizing yielding means between the tube flaring member and the rotatable shaft and in which the stop means for limiting the inward axial movement of the stem of the tube flaring member is located inside the shaft at a point considerably removed from the entrance to the shaft and in which the thrust of the stem in the flaring operation is against the inside wall of the shaft.

Other objects will become apparent as th s description progresses.

In the drawings:

FIG. 1 is an elevational view, partly in section, of the tool of this invention, with the end of the tube clamped in position for flaring.

FIG. 2 is an enlarged longitudinal sectional view with the tool in flaring position.

FIG. 3 is a view similar to FIG. 2 but with the tool in burnishing position.

FIG. 4 is an enlarged sectional View taken on lines 4-4 of FIG. 2, and

FIG. 5 is an enlarged longitudinal sectional view of a modified tool in flaring position.

The embodiment shown in FIGS. 1 to 4 inclusive will now be described.

The tool includes a frame member generally indicated at which is of generally C-shaped con-figuration in side elevation, having a top portion 12 with a connected rear side portion 13 and a bottom 14 having spaced legs as which form the supports. The top 12 has a central internally threaded bore 16 to accommodate an externally threaded shaft 18. The shaft 18 has a handle 2h rigidly aflixed to it at its upper end so that the shaft may be manually rotated by said handle and thereby move the shaft axially in bore 16, for the purpose to be more fully explained.

The lower end of shaft 18 has a hollow portion or bore 21 providing an inner end wall 22 and an inner annular side wall 24. The inner end wall 22 serves as the stop means to be engaged by the stop engaging member of the tube flaring member, to be described.

The tube flaring member generally indicated at 26 is provided with a cone-shaped member 28 and a stem 30 integrally formed therewith or fixedly secured thereto. The stem 30 is centrally positioned with respect to the cone and the stem is received in the bore 21 of the shaft 18. The stem 30 is formed of two diameters. One portion 3 1 of the stem 30 has a sliding fit engagement with the inner lower end of the wall 24 of the shaft 18, while the upper annular end 32 of the stem is of reduced diameter, providing a shoulder 34 therebetween. The reduced end 3'2 of the stem 3% has an end wall 35 which is the ice stop engaging means and is adapted to engage the inner end wall 22 of the shaft 18 to limit the inward or retracted movement of the tube flaring member. The stem portion 31 has a transversely extending pin 38 fixedly secured thereto which extends laterally of the stem in opposite directions and is received in alined and spaced enlarged openings or slots 40 in the shaft 18. The flaring member 26 isthus coupled to the shaft 18 to be rotated thereby. The openings or slots 40 permit a relative axial movement between the cross-pin 3 8 and slots 40 and this permits the relative axial movement between the flaring member 26 and the shaft 18.

A coiled compression spring 42 surrounds the reduced stem portion 32, with one end of the spring res-ting against the shoulder '34 and the other against the inner end wall 22 to normally urge the flaring member 26 in a direction outwardly of the bore of the shaft. When the tool is used in the flaring operation, as shown in FIG. 2, the flaring member will be urged inwardly and its inward axial movement will be arrested when the end 36 of the stem engages the inner end wall 22 of the bore. When this occurs, the inner horizontal surface 29 of the cone member 28 is spaced from the adjacent end :19 of the shaft 18. With this arrangement the thrust of the stem in the flaring operation is against the inner end wall 22 of the shaft.

The tube T to be flared and burnished is placed in a conventional clam-ping means or split type clamping block generally indicated at 44, having the usual tapered surface 4 6. The tube clamping means and tube are supported in the frame vlltl, as shown in FIG. '1, with the clamping means resting on the spaced legs 15 and the tube T extending downwardly between the legs. The shaft 1 8 is rotated by the handle 20 for moving the shaft axially with respect to the frame 1d. The clockwise rotation of the shaft 18 will cause the cone-shaped head 28 to engage the end of the tube T and the flaring member will move inwardly, compressing the spring 42 until the end 36 of the stem engages the inner end wall 22, which limits the inward movement of the flaring tool and causes the flaring cone to flare the tube, as shown in FIG, 2. In this position the transverse pin 38 is at the upper end of the slots 40. Upon the reverse of counterclockwise rotation of the shaft 18 through the rotation of the handle 20, the shaft '18 will move axially away from the tube T, yet the spring 42 will expand and push against the stem 30, causing the transverse pin 38 to move downwardly in the slots 40 and thereby urge the cone or head 28 to remain in contact with the flared tube T and burnish the flared tube until the shaft 18 has been rotated counterclockwise sufliciently to withdraw the cone 28 from its contact with the flared tube. Thus, with the initial reverse of withdrawal rotation of the shaft 18 the cone member 28 remains in contact with the flared tube to effect the burnishing operation.

The modified construction of the flaring tool shown in FIG. 5 will now be described.

The externally threaded shaft 18 is supported in the same frame member '10, previously described, and is rotated with respect to the frame by a handle 20'. The threaded shaft 18' is provided at its lower end with a hollow portion or bore 46 having an inner end wall 48. The bore 46 communicates with a centrally positioned reduced bore 50.

The flaring member generally indicated at 52 has a cone 54. and a stem 56 extending upwardly thereof. The stem 56 has a lower portion 58, an intermediate portion 60 of reduced diameter, and an end portion 62 of a further reduced diameter. A shoulder 64 is provided between the stem portions 58 and 60 and a shoulder 66 is provided between the stem portions 60 and 62. The lower portion 58 of the stem has a transversely extending slot 68 which accommodates a. transverse pin 70 fixedly secured to the shaft 18 for coupling the flaring mem- $9 I bet to the shaft while permitting axial movement therebetween. The end 62 of the stem is supported in the reduced bore 50.

A coiled compression spring 72 is positioned inside the bore around the stem portion 60, with one end of the spring resting against the shoulder 64 and the other end against the end wall 48. The stem portion 58 has a sliding fit with the lower end of the annular wall of the bore. Also, the reduced stem portion 62 has a sliding fit with the inner wall of the reduced bore section 50 to provide an additional guiding surface between the stern and the shaft. If desired, the reduced bore 50 and the reduced stem portion 62 of the stem may be of rectangular or square-shape to permit a sliding axial movement, but no rotative movement, therebetween.

The inward movement of the stem 56 is arrested when the shoulder 66 of the stem engages the inner end wall 48 of the shaft 18'. The end wall 48 forms the stop means and the shoulder 66 is the stop engaging means. When these parts are engaged, as shown in FIG. 5, the inner horizontal surface 74 of the cone member 54 is spaced from the adjacent end 76 of the shaft 18'. The operation of the FIG. embodiment is similar to that previously described.

In place of the compression spring 42 in FIGS. 1 to 4, and the compression spring 72 in FIG. 5, any other type of resilient means may be employed. For example, a rubber or like resilient member may be substituted for the spring and placed around the respective stems in the same positions as the springs to accomplish the same purpose.

It will be understood that various changes and modifications may be made from the foregoing without departing from the spirit and scope of the appended claims.

What is claimed is:

1. A tube flaring and'burnishing tool comprising a frame member having a threaded bore through one portion thereof and a support portion adapted to have a tube end supported therein in alinement with said threaded bore, an externally threaded shaft engaged in said threaded bore for rotative and axial movement relative to said frame, said shaft having a bore at the lower end thereof, said bore having stop means inside said bore at a point removed from the entrance to said bore, tube flaring means including a cone and a stem with the stem supported in said shaft bore, said stem having means at its upper end within said bore for engaging said stop means to limit the inward axial movement of said tube flaring means, spring means around said stem and engaging said stem and said stop means for normally urging said tube flaring member axially outward, a handle for rotating said shaft and said flaring means in either direction to advance or retract said shaft, means between said shaft and said tube flaring means for coupling same to permit axial movement between the flaring means and said shaft and rotative movement with said shaft, said stop means being engaged by said upper end of said stem after said flaring means has been advanced so that the cone engages a tube for flaring operation, said spring means forcefully maintaining said cone urged against a tube to effect a A} burnishing thereof during retracting rotation of said shaft until said cone disenga'gcs from the tube.

2. A structure defined in claim 1 in which the coupling means includes a pin member movable with respect to a slot member, with one of said members on the shaft and the other on the stem.

3. A structure defined in claim 1 in which the coupling means includes a transverse pin secured to the stern and a slot in the shaft engageable by said pin.

4. A structure defined in claim 3 in which the slot and pin are adjacent the cone.

5. A structure defined in claim 1 in which the stem has a shoulder against which rests one end of the spring means, with the shoulder being adjacent the upper end of the stem.

6. A structure defined in claim 1 in which the stem has a reduced diameter portion at its upper end movable within a reduced diameter bore in the shaft.

7. A structure defined in claim 1 in which the spring means is a resilient member.

8.'A tube flaring and burnishing tool comprising a frame member having a threaded bore through one portion thereof and a support portion adapted to have a tube end supported therein in alinement with said threaded bore, an externally threaded shaft engaged in said threaded bore for rotative and axial movement relative to said frame, said shaft having a bore at the lower end thereof and said bore having stop means inside said bore at a point removed from the entrance to said bore, tube flaring means including a cone and a stem with the stem supported in said shaft bore, said stem having means at its upper end within said bore for engaging said stop means to limit the inward axial movement of said tube flaring means, resilient means around said stem and engaging said stem and said stop means for normally urging said tube flaring member axially outward, a handle for rotating said shaft and said flaring means in either direction to advance or retract said shaft, means between said shaft and said tube flaring means for coupling same to permit axial movement between the flaring means and said shaft and rotative movement with said shaft, said resilient means being compressed and the upper end of said stem engaging said stop means when said cone is in tube flaring operation, and said resilient member being extended and said upper end of said stem disengaged from said stop means when said cone is in burnishing operation, said flaring operation being performed .when said shaft is rotated to advance the shaft and said burnishing operation being performed when said shaft is rotated to retract said shaft.

References Cited by the Examiner UNITED STATES PATENTS 12,737,225 3/1956 Jasinski 72117 2,893,463 7/1959 Kowal 72-117 2,893,464 7/1959 Franck 72117 3,050,103 8/1962 Janik 72-117 CHARLES W. LANHAM, Primary Examiner.

R. I. HERBST, Assistant Examiner.

Claims (1)

1. A TUBE FLARING AND BURNISHING TOOL COMPRISING A FRAME MEMBER HAVING A THREADED BORE THROUGH ONE PORTION THEREOF AND A SUPPORT PORTION ADAPTED TO HAVE A TUBE END SUPPORTED THEREIN IN ALINEMENT WITH SAID THREADED BORE, AN EXTERNALLY THREADED SHAFT ENGAGED IN SAID THREADED BORE FOR ROTATIVE AND AXIAL MOVEMENT RELATIVE TO SAID FRAME, SAID SHAFT HAVING A BORE AT THE LOWER END THEREOF, SAID BORE HAVING STOP MEANS INSIDE SAID BORE AT A POINT REMOVED FROM THE ENTRANCE TO SAID BORE, TUBE FLARING MEANS INCLUDING A CONE AND A STEM WITH THE STEM SUPPORTED IN SAID SHAFT BORE, SAID STEM HAVING MEANS AT ITS UPPER END WITHIN SAID BORE FOR ENGAGING SAID STOP MEANS TO LIMIT THE INWARD AXIAL MOVEMENT OF SAID TUBE FLARING MEANS, SPRING MEANS AROUND SAID STEM AND ENGAGING SAID STEM AND SAID STOP MEANS FOR NORMALLY URGING SAID TUBE FLARING MEMBER AXIALLY OUTWARD, A HANDLE FOR ROTATING SAID SHAFT AND SAID FLARING MEANS IN EITHER DIRECTION TO

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