CA1301612C - Tube bender - Google Patents
Tube benderInfo
- Publication number
- CA1301612C CA1301612C CA000547947A CA547947A CA1301612C CA 1301612 C CA1301612 C CA 1301612C CA 000547947 A CA000547947 A CA 000547947A CA 547947 A CA547947 A CA 547947A CA 1301612 C CA1301612 C CA 1301612C
- Authority
- CA
- Canada
- Prior art keywords
- handle
- shoe
- socket
- tube
- grasping portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
- B21D7/063—Pliers with forming dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
TUBE BENDER
Abstract of the Disclosure A tube bender having a swivel connection of the handle to the shoe for facilitating readjustment of the handle in providing tube bends of greater than 90°, while avoiding crossover of the tube handle with the mandrel handle. The shoe handle includes a cylindrical extension rotatably received in a socket in the shoe and structure is provided for automatically disposing the handle in either of preselected dispositions. The extension is caused to be disposed in an overcenter arrangement in the preselected dispositions so as to cause forces generated on the shoe handle during the bending operation to more firmly lock the handle in the preselected disposition. A
friction washer is provided for biasing the shoe handle to provide releasable retention thereof in the preselect-ed positions.
Abstract of the Disclosure A tube bender having a swivel connection of the handle to the shoe for facilitating readjustment of the handle in providing tube bends of greater than 90°, while avoiding crossover of the tube handle with the mandrel handle. The shoe handle includes a cylindrical extension rotatably received in a socket in the shoe and structure is provided for automatically disposing the handle in either of preselected dispositions. The extension is caused to be disposed in an overcenter arrangement in the preselected dispositions so as to cause forces generated on the shoe handle during the bending operation to more firmly lock the handle in the preselected disposition. A
friction washer is provided for biasing the shoe handle to provide releasable retention thereof in the preselect-ed positions.
Description
1301~i2 TUBE BENDER
Description Technical Field This invention relates to tube benders and in 5 particular to manually operable tube benders having a pair of manually graspable handles for moving a bending shoe relative to a bending mandrel.
Backqround Art One improved form of manually operable tube bender 10 is disclosed in U.S. Letters Patent 3,685,335 of Leonard J. Kowal. As shown therein, a mandrel is provided with a peripheral arcuate groove into which a tube to be bent is urged by a cooperating shoe. The shoe is swingably mounted in association with the mandrel and is moved by 15 means of a handle extending outwardly therefrom. The mandrel, in turn, is supported on a second handle rigidly connected thereto, and in the tube forming operation, the first handle is brought from a start position wherein it extends generally perpendicularly to the second handle to 20 a final position wherein the grasping portion thereof is disposed adjacent the grasping portion of the second handle.
It is desirable to limit the swing of the first handle so as to avoid a crossover between the handles in 25 effecting the desired bend. Such limitation restricts the amount of movement of the shoe about the mandrel groove. It has been proposed to incorporate, in the tube bender, means for permitting the first handle to be repositioned from the initial end position adjacent the 30 grasping portion of the first handle so as to permit a further travel of the bending shoe about the mandrel by effecting a subsequent movement of the first handle similarly to the initial movement thereof between the bend start location and the position adjacent the second 35 handle grasping means. Thus, a bend of up to 180 may be ~3016~2 effected with such structure without losing the desirable leverage and thereby permitting the bending of relatively rigid tubing.
U.S. Letters Patent 2,979,976 and 3,190,105 attempt 5 to provide this feature in the prior art. The benders disclosed in these patents, however, suffer from the problems of being complex in design and thus more expen-sive to manufacture. Further, U.S. Patent 2,979,976 discloses a manual locking mechanism which is cumbersome to use while U.S. Patent 3,190,105 discloses a bender design in which the operation of repositioning the handle requires more care and control.
Disclosure of Invention The present invention comprehends a tube bender lS having improved means for permitting repositioning of the first handle when desired so as to permit extended bend-ing of the tube in the mandrel groove, such as up to approximately 18~.
The invention comprehends the provision of means connecting the first handle to the shoe, permitting swiveling thereof between any one of a plurality of preselected positions, and in the illustrated embodiment, the handle connecting means provides for two preselected swiveled positions of the first handle relative to the 2S shoe.
The illustrated handle includes an end portion rotatably received in a socket provided in the shoe. The means for retaining the handle end in the socket further defines the means for providing the preselected position-ing of the handle.
In the illustrated embodiment, the grasping portionof the first handle extends at an angle of approximately 65 to the end portion received in the socket.
In the illustrated embodiment, the end portion of 5 the first handle is rotatable 180 in the socket in 1:~016i2 providinq the two preselected positions of the grasping portion of the handle.
Resiliently biased friction are provided for retaining the first handle in either of the preselected 5 positions.
The means for connecting the first handle to the shoe includes overcenter means for causing the first handle to be effectively held in the selected preselected disposition as a result of application of tube bending 10 force to the first handle.
The tube bender structure of the invention is extremely simple and economical of construction, provides automatic self-locking of the handle in the desired dispositions, provides improved swiveling means for 15 extended useful life and esthetics, and provides con-trolled, smooth operation in effecting the tube bend.
Brief Description of the Drawing Other features and advantages of the invention will be apparent from the following description taken in 20 connection with the accompanying drawing wherein:
FIGURE 1 is a side elevation of a tube bender structure embodying the invention, with the handle con-nected to the shoe being shown in different positions in broken lines;
FIGURE 2 is a fragmentary enlarged side elevation, with portions broken away illustrating the connection of the handle to the shoe in greater detail;
FIGURE 3A is a fragmentary transverse section taken substantially along the line 3-3 of Figure 2;
FIGURE 3B is a view similar to that of Figure 3A, but with the handle in the dotted line position of Figure 2; and FIGURE 4 is a fragmentary exploded side elevation of the handle connecting means, with the shoe structure 35 omitted.
130161;~
Best ~leans for Carryinq Out the Invention In the illustrative embodiment of the invention as disclosed in the drawing, a tube bender generally desig-nated 10 is shown to include a mandrel 11 having a pe-ripheral tube bending groove 12 extending concentricallyabout an axis 13 of the mandrel.
A tube bending shoe 14 is swingably connected to the mandrel by a link 15 for concentric movement about axis 13 in pressing a tube T to be bent progressively into the groove 12 as a result of swinging of the shoe from a bend start position 16 to a bend position 17 of approximately 90, as seen in Figure 1.
The present invèntion is concerned with providing means for permitting the tube bender to be used in ex-tending the tube bend beyond 90, such as up to approxi-mately 180 with improved facility.
More specifically, the mandrel is fixedly secured to an end 18 of a first handle 19 having a grasping portion 20 at the end opposite end 18. Shoe 16 is caused to move about the mandrel by, means of a second handle 21 having an end 22 connected to the shoe and a grasping portion 23 at the end opposite end 22.
Handle end 22 defines a longitudinal axis 24 and grasping portion 23 defines a longitudinal axis 25. As best seen 1n Figure 2, axis 25 extends at an angle of approximately 115 to axis 24.
In the illustrated embodiment, handle end 22 includes an arcuate portion 26 and a rectilinear, distal end portion 27. As seen in Figure 4, the handle is tubular and a cylindrical extension 28 is fitted into the distal end 27. Extension 28 is rigidly secured to the handle end portion 27 by suitable crimping 29.
Adjacent its distal end 30, extension 28 is provided with a chordal slot 31 extending approximately three-quarters through the transverse extent of the extension.
130~612 The inner end 32 of slot 31 is arcuate and is adapted tosnugly receive a locking pin 33.
As best seen in Figure 2, handle extension 28 is rotatably received in a cylindrical socket 34 in shoe 16 for rotation about axis 24. The shank 35 of pin 33 extends less than halfway through the extension slot 31, as illustrated in Figures 3A and 3B. In swinging about axls 24, bottom 32 of slot 31 is brought around the distal end 36 of shank 35 so as to be selectively dis-posed in the alternative positions of Figure 3A and 3B180 apart. In the illustrated embodiment, the rotation is slightly more than 180 so as to dispose the handle slightly over center in each of the preselected end positions, whereby a force generated through the handle in urging the shoe about the mandrel axis 13 in the bending operation tends to lock the handle in the prese-lected position.
The handle is further releasably retained in the selected position by means of a spring washer 37 received in the bottom of socket 34 and resiliently urging the extension portion of the handle longitudinally outwardly against the side of locking pin shank 35.
Pin 33 is force-fitting through the side of the shoe, as illustrated in Figures 3A and 3B, and is pressed 25 in flush with the outside surface 38 for accurately positioning the inner end 36 to permit maximum seating of the extension 28 on the side of the pin n the selected dispositions of Figures 3A and 3B, while yet permitting the swinging of the slot end 32 around the distal end of 30 the pin.
As shown, the swiveling means is recessed within the shoe for minimized maintenance requirements and long troublefree life. That is, the swiveling means is pro-tected from contamination and not open as in prior art 35 devices.
130~612 In use, the handle 21 is firstly arranged, as shown in broken lines at the top of Figure 1, and the shoe 16 manipulated on link 15 to bring the shoe against the tube T to be bent in groove 12 of the mandrel. Shoe 16 is then swung about axis 13 of the mandrel by movement of the handle 21 from the bend start position an angular distance A to approximately a 90 bend position wherein the handle grasping portion 23 is juxtaposed to the grasping portion 20 of handle 19. To provide a bend of 10 over approximately 90, the user need merely swivel handle 21 about the axis 24 of extension 28 so as to bring the grasping portion 23 again back to adjacent the original bend start position, whereupon further swinging of the shoe about axis 13 of the mandrel may be effected 15 over the angle B to a final bend position illustrated in full lines in Figure 1 and wherein the tube is bent approximately 180, as shown therein.
While the handle 21 is effectively retained in the preselected dispositions by the overcenter arrangement 20 during the bending operation, the handle may be readily rotated between the two preselected positions about axis 24 of the extension 28 against the releasable biasing action of the spring washer 37 in positioning the exten-sion portion 28 in either of the desired selected posi-25 tions of Figures 3A and 3B.
The improved swingable handle of the presentinvention provides automatic preselection of the handle dispositions with a self-locking feature assuring that the handle be retained in the desired preselected posi-30 tion during the bending operation. The complete enclo-sure of the swivel mechanism provides long, troublefree extended life. The loading of the swivel by means of the spring washer provides controlled smooth adjustment. The swivel structure is extremely simple and economical of 35 construction while yet providing the highly desirable ~30~6~2 functioning discussed above.
The foregoing disclosure of specific embodiments is illustrative of the broad inventive concepts comprehended by the invention.
. _ .
Description Technical Field This invention relates to tube benders and in 5 particular to manually operable tube benders having a pair of manually graspable handles for moving a bending shoe relative to a bending mandrel.
Backqround Art One improved form of manually operable tube bender 10 is disclosed in U.S. Letters Patent 3,685,335 of Leonard J. Kowal. As shown therein, a mandrel is provided with a peripheral arcuate groove into which a tube to be bent is urged by a cooperating shoe. The shoe is swingably mounted in association with the mandrel and is moved by 15 means of a handle extending outwardly therefrom. The mandrel, in turn, is supported on a second handle rigidly connected thereto, and in the tube forming operation, the first handle is brought from a start position wherein it extends generally perpendicularly to the second handle to 20 a final position wherein the grasping portion thereof is disposed adjacent the grasping portion of the second handle.
It is desirable to limit the swing of the first handle so as to avoid a crossover between the handles in 25 effecting the desired bend. Such limitation restricts the amount of movement of the shoe about the mandrel groove. It has been proposed to incorporate, in the tube bender, means for permitting the first handle to be repositioned from the initial end position adjacent the 30 grasping portion of the first handle so as to permit a further travel of the bending shoe about the mandrel by effecting a subsequent movement of the first handle similarly to the initial movement thereof between the bend start location and the position adjacent the second 35 handle grasping means. Thus, a bend of up to 180 may be ~3016~2 effected with such structure without losing the desirable leverage and thereby permitting the bending of relatively rigid tubing.
U.S. Letters Patent 2,979,976 and 3,190,105 attempt 5 to provide this feature in the prior art. The benders disclosed in these patents, however, suffer from the problems of being complex in design and thus more expen-sive to manufacture. Further, U.S. Patent 2,979,976 discloses a manual locking mechanism which is cumbersome to use while U.S. Patent 3,190,105 discloses a bender design in which the operation of repositioning the handle requires more care and control.
Disclosure of Invention The present invention comprehends a tube bender lS having improved means for permitting repositioning of the first handle when desired so as to permit extended bend-ing of the tube in the mandrel groove, such as up to approximately 18~.
The invention comprehends the provision of means connecting the first handle to the shoe, permitting swiveling thereof between any one of a plurality of preselected positions, and in the illustrated embodiment, the handle connecting means provides for two preselected swiveled positions of the first handle relative to the 2S shoe.
The illustrated handle includes an end portion rotatably received in a socket provided in the shoe. The means for retaining the handle end in the socket further defines the means for providing the preselected position-ing of the handle.
In the illustrated embodiment, the grasping portionof the first handle extends at an angle of approximately 65 to the end portion received in the socket.
In the illustrated embodiment, the end portion of 5 the first handle is rotatable 180 in the socket in 1:~016i2 providinq the two preselected positions of the grasping portion of the handle.
Resiliently biased friction are provided for retaining the first handle in either of the preselected 5 positions.
The means for connecting the first handle to the shoe includes overcenter means for causing the first handle to be effectively held in the selected preselected disposition as a result of application of tube bending 10 force to the first handle.
The tube bender structure of the invention is extremely simple and economical of construction, provides automatic self-locking of the handle in the desired dispositions, provides improved swiveling means for 15 extended useful life and esthetics, and provides con-trolled, smooth operation in effecting the tube bend.
Brief Description of the Drawing Other features and advantages of the invention will be apparent from the following description taken in 20 connection with the accompanying drawing wherein:
FIGURE 1 is a side elevation of a tube bender structure embodying the invention, with the handle con-nected to the shoe being shown in different positions in broken lines;
FIGURE 2 is a fragmentary enlarged side elevation, with portions broken away illustrating the connection of the handle to the shoe in greater detail;
FIGURE 3A is a fragmentary transverse section taken substantially along the line 3-3 of Figure 2;
FIGURE 3B is a view similar to that of Figure 3A, but with the handle in the dotted line position of Figure 2; and FIGURE 4 is a fragmentary exploded side elevation of the handle connecting means, with the shoe structure 35 omitted.
130161;~
Best ~leans for Carryinq Out the Invention In the illustrative embodiment of the invention as disclosed in the drawing, a tube bender generally desig-nated 10 is shown to include a mandrel 11 having a pe-ripheral tube bending groove 12 extending concentricallyabout an axis 13 of the mandrel.
A tube bending shoe 14 is swingably connected to the mandrel by a link 15 for concentric movement about axis 13 in pressing a tube T to be bent progressively into the groove 12 as a result of swinging of the shoe from a bend start position 16 to a bend position 17 of approximately 90, as seen in Figure 1.
The present invèntion is concerned with providing means for permitting the tube bender to be used in ex-tending the tube bend beyond 90, such as up to approxi-mately 180 with improved facility.
More specifically, the mandrel is fixedly secured to an end 18 of a first handle 19 having a grasping portion 20 at the end opposite end 18. Shoe 16 is caused to move about the mandrel by, means of a second handle 21 having an end 22 connected to the shoe and a grasping portion 23 at the end opposite end 22.
Handle end 22 defines a longitudinal axis 24 and grasping portion 23 defines a longitudinal axis 25. As best seen 1n Figure 2, axis 25 extends at an angle of approximately 115 to axis 24.
In the illustrated embodiment, handle end 22 includes an arcuate portion 26 and a rectilinear, distal end portion 27. As seen in Figure 4, the handle is tubular and a cylindrical extension 28 is fitted into the distal end 27. Extension 28 is rigidly secured to the handle end portion 27 by suitable crimping 29.
Adjacent its distal end 30, extension 28 is provided with a chordal slot 31 extending approximately three-quarters through the transverse extent of the extension.
130~612 The inner end 32 of slot 31 is arcuate and is adapted tosnugly receive a locking pin 33.
As best seen in Figure 2, handle extension 28 is rotatably received in a cylindrical socket 34 in shoe 16 for rotation about axis 24. The shank 35 of pin 33 extends less than halfway through the extension slot 31, as illustrated in Figures 3A and 3B. In swinging about axls 24, bottom 32 of slot 31 is brought around the distal end 36 of shank 35 so as to be selectively dis-posed in the alternative positions of Figure 3A and 3B180 apart. In the illustrated embodiment, the rotation is slightly more than 180 so as to dispose the handle slightly over center in each of the preselected end positions, whereby a force generated through the handle in urging the shoe about the mandrel axis 13 in the bending operation tends to lock the handle in the prese-lected position.
The handle is further releasably retained in the selected position by means of a spring washer 37 received in the bottom of socket 34 and resiliently urging the extension portion of the handle longitudinally outwardly against the side of locking pin shank 35.
Pin 33 is force-fitting through the side of the shoe, as illustrated in Figures 3A and 3B, and is pressed 25 in flush with the outside surface 38 for accurately positioning the inner end 36 to permit maximum seating of the extension 28 on the side of the pin n the selected dispositions of Figures 3A and 3B, while yet permitting the swinging of the slot end 32 around the distal end of 30 the pin.
As shown, the swiveling means is recessed within the shoe for minimized maintenance requirements and long troublefree life. That is, the swiveling means is pro-tected from contamination and not open as in prior art 35 devices.
130~612 In use, the handle 21 is firstly arranged, as shown in broken lines at the top of Figure 1, and the shoe 16 manipulated on link 15 to bring the shoe against the tube T to be bent in groove 12 of the mandrel. Shoe 16 is then swung about axis 13 of the mandrel by movement of the handle 21 from the bend start position an angular distance A to approximately a 90 bend position wherein the handle grasping portion 23 is juxtaposed to the grasping portion 20 of handle 19. To provide a bend of 10 over approximately 90, the user need merely swivel handle 21 about the axis 24 of extension 28 so as to bring the grasping portion 23 again back to adjacent the original bend start position, whereupon further swinging of the shoe about axis 13 of the mandrel may be effected 15 over the angle B to a final bend position illustrated in full lines in Figure 1 and wherein the tube is bent approximately 180, as shown therein.
While the handle 21 is effectively retained in the preselected dispositions by the overcenter arrangement 20 during the bending operation, the handle may be readily rotated between the two preselected positions about axis 24 of the extension 28 against the releasable biasing action of the spring washer 37 in positioning the exten-sion portion 28 in either of the desired selected posi-25 tions of Figures 3A and 3B.
The improved swingable handle of the presentinvention provides automatic preselection of the handle dispositions with a self-locking feature assuring that the handle be retained in the desired preselected posi-30 tion during the bending operation. The complete enclo-sure of the swivel mechanism provides long, troublefree extended life. The loading of the swivel by means of the spring washer provides controlled smooth adjustment. The swivel structure is extremely simple and economical of 35 construction while yet providing the highly desirable ~30~6~2 functioning discussed above.
The foregoing disclosure of specific embodiments is illustrative of the broad inventive concepts comprehended by the invention.
. _ .
Claims (16)
1. In a tube bender having a mandrel defining a bending axis and having a peripheral radially outwardly opening tube-receiving groove concentric to said bending axis, a tube-bending shoe, first means connecting the shoe to the mandrel for swinging movement about said bending axis adjacent said groove, and a first handle having a grasping portion and an end fixed to said mandrel, the improvement comprising:
a second handle having a grasping portion and an end, the grasping portion and its axis being angled away from the end and its axis; and second means connecting said second handle end to said shoe so that manipulation of the grasping portion of the second handle effects swinging movement of said shoe about said bending axis, said second means comprising means for permitting selective rotation of said grasping portion about the axis of the second handle and to any one of a plurality of different positions directed outwardly from said shoe to permit a plurality of similar swinging movements of said seccond handle grasping portion toward the first handle grasping portion from a start location in moving said shoe in a corresponding pluality of successive movements seriatim about said bending axis.
a second handle having a grasping portion and an end, the grasping portion and its axis being angled away from the end and its axis; and second means connecting said second handle end to said shoe so that manipulation of the grasping portion of the second handle effects swinging movement of said shoe about said bending axis, said second means comprising means for permitting selective rotation of said grasping portion about the axis of the second handle and to any one of a plurality of different positions directed outwardly from said shoe to permit a plurality of similar swinging movements of said seccond handle grasping portion toward the first handle grasping portion from a start location in moving said shoe in a corresponding pluality of successive movements seriatim about said bending axis.
2. The tube bender structure of claim 1 wherein said second means comprises a socket in said shoe, a distal portion of said second handle being received in a said socket for selective rotation about said second handle end.
3. The tube bender structure of claim 1 wherein said second means comprises a socket in said shoe, a distal portion of said second handle defining a longitudinal axis and being received in said socket for selective positioning about said longitudinal axis, said second handle grasping portion defining a longitudinal axis extending angularly to said second handle distal portion longitudinal axis.
4. The tube bender structure of claim 1 wherein said second means comprises a socket in said shoe, a distal portion of said second handle defining a longitudinal axis and being received in said socket for selective positioning about said longitudinal axis, said second handle grasping portion defining a longitudinal axis extending at an angle of approxi-mately 115° to said second handle distal portion longitudinal axis.
5. The tube bender structure of claim 1 wherein said second means comprises a socket in said shoe, a distal portion of said second handle defining a longitudinal axis and being received in said socket for selective positioning about said longitudinal axis in any one of a plurality of preselected different angularly related dispositions.
6. The tube bender structure of claim 1 wherein said second means comprises a socket in said shoe, a distal portion of said second handle defining a longitudinal axis and being received in said socket for selective positioning about said longitudinal axis in first and second preselected angularly related dispositions.
7. The tube bender structure of claim 1 wherein said second means comprises a socket in said shoe, a distal portion of said second handle defining a longitudinal axis and being received in said socket for selective positioning about said longitudinal axis in first and second preselected angularly related dispositions approximately 180° apart.
8. The tube bender structure of claim 1 wherein said second means comprises means for rotatably locking said end of the second handle to said shoe.
9. In a tube bender having a mandrel defining a bending axis and having a peripheral radially outwardly opening tube-receiving groove concentric to said bending axis, a tube-bending shoe, means connecting the shoe to the mandrel for movement about said bending axis adjacent said groove, and a first handle having a grasping portion and an end fixed to said mandrel, the improvement comprising:
a second handle having a grasping portion and an end angled away from the grasping portion; and connecting means for rotatably connecting said end to said shoe to permit rotation of the grasping portion about said end to thereby dispose said grasping portion in either of two preselected rotational positions about said end.
a second handle having a grasping portion and an end angled away from the grasping portion; and connecting means for rotatably connecting said end to said shoe to permit rotation of the grasping portion about said end to thereby dispose said grasping portion in either of two preselected rotational positions about said end.
10. The tube bender structure of claim 9 wherein said second handle end is rotatably connected to said shoe to dispose said grasping portion thereof in either of two preselected positions with said end and said grasping portion being approximately 115° apart.
11. The tube bender structure of claim 9 wherein said second handle end is rotatably received in a socket in said shoe.
12. The tube bender structure of claim 9 wherein said second handle end is rotatably received in a socket in said shoe for rotation between positions which are 180° apart.
13. The tube bender structure of claim 9 including means for rigidly securing said second handle grasping portion to said second handle end.
14. The tube bender structure of claim 9 wherein means are provided for releasably retaining the second handle in said preselected position.
15. The tube bender structure of claim 9 wherein resiliently biased friction means are provided for releasably retaining the second handle in said preselected positions.
16. The tube bender structure of claim 9 wherein said connecting means comprises overcenter means for causing said second handle to be effectively held in the selected preselected position as a result of application of tube-bending force to said second handle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US91823686A | 1986-10-14 | 1986-10-14 | |
| US06/918,236 | 1986-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1301612C true CA1301612C (en) | 1992-05-26 |
Family
ID=25440041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000547947A Expired - Lifetime CA1301612C (en) | 1986-10-14 | 1987-09-28 | Tube bender |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2542006B2 (en) |
| KR (1) | KR950009914B1 (en) |
| CA (1) | CA1301612C (en) |
| DE (1) | DE3734672C2 (en) |
| FR (1) | FR2604931B1 (en) |
| GB (1) | GB2195932B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222025A (en) * | 2020-09-17 | 2021-01-15 | 马鞍山恺森自动化工程有限公司 | Double-servo pump control electro-hydraulic bending machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6609405B1 (en) * | 2002-10-15 | 2003-08-26 | Stride Tool Inc. | Tube bender and method of using same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2654279A (en) * | 1950-04-19 | 1953-10-06 | Tomarin Marcus | Tube bending hand tool with a rocking pressure member |
| US2979976A (en) * | 1959-04-06 | 1961-04-18 | Imp Eastman Corp | Plier-type tube bending tool |
| US3190105A (en) * | 1962-05-21 | 1965-06-22 | Imp Eastman Corp | Tube bender |
| NL6513737A (en) * | 1964-10-23 | 1966-04-25 | ||
| US3685335A (en) * | 1970-11-05 | 1972-08-22 | Imp Eastman Corp | Tube bender |
-
1987
- 1987-09-28 CA CA000547947A patent/CA1301612C/en not_active Expired - Lifetime
- 1987-10-08 GB GB8723633A patent/GB2195932B/en not_active Expired - Lifetime
- 1987-10-13 KR KR1019870011306A patent/KR950009914B1/en not_active IP Right Cessation
- 1987-10-13 DE DE3734672A patent/DE3734672C2/en not_active Expired - Fee Related
- 1987-10-14 JP JP62257463A patent/JP2542006B2/en not_active Expired - Lifetime
- 1987-10-14 FR FR878714214A patent/FR2604931B1/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222025A (en) * | 2020-09-17 | 2021-01-15 | 马鞍山恺森自动化工程有限公司 | Double-servo pump control electro-hydraulic bending machine |
| CN112222025B (en) * | 2020-09-17 | 2022-01-14 | 马鞍山恺森自动化工程有限公司 | Double-servo pump control electro-hydraulic bending machine |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2604931B1 (en) | 1991-08-16 |
| DE3734672A1 (en) | 1988-04-21 |
| JP2542006B2 (en) | 1996-10-09 |
| GB2195932B (en) | 1991-04-17 |
| KR950009914B1 (en) | 1995-09-01 |
| KR880004867A (en) | 1988-06-27 |
| DE3734672C2 (en) | 1997-06-05 |
| GB8723633D0 (en) | 1987-11-11 |
| GB2195932A (en) | 1988-04-20 |
| FR2604931A1 (en) | 1988-04-15 |
| JPS63101026A (en) | 1988-05-06 |
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