Patent US3584492A successfully refreshed from Google Patents.
US3584492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube-bending tool
Assignee: Crawford Fitting Co
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Filing: 1968-11-13
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Granted: 1971-06-15
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Expires: 1988-11-13
Abstract
Abstract Disclosed is a tube-bending tool comprising a forming roll adapted to be turned by means of a crank. A tube clamp bar is operatively secured to the forming roll and is provided with a tube clamp. A cam shoe is pivotally mounted on the tool cover and is adapted to be moved into or out of engagement with the forming roll by means of a handle. Opposed grooves are provided in the forming roll and the cam shoe for the purpose of supporting the tube as the forming roll is rotated. The opposed grooves have a transverse dimension slightly larger than the tube outer diameter whereby the tube is free to elastically deform in a transverse plane during the bending operation.
Inventors
- 👤 Harry G Dodge
- 👤 Emery J Zahuranec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/02; B21D7/024
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
157 words
In a tube-bending tool: a forming roll; means for turning said forming roll; tube-supporting mean; said forming roll having an arcuate side face with a groove defined therein; said groove in said forming roll defined in section by an arcuate wall formed on a radius R2 from a point offset a distance from the plane of said side face; said distance having a variable length which is a function of the rotation of said forming roll; said supporting means having a surface with a groove defined therein; said groove in said supporting means defined in section by an arcuate wall formed on a radius R from a point in the plane of said surface; the walls defining said groove of said supporting means and said groove of said forming roll together adapted to support a tube in a transverse plane while providing a space of variable depth for the tube to be deformed during the bending operation.
Claim 2
Dependent Claim
157 words
In a tube-bending tool: a forming roll; means for turning said forming roll; tube-supporting mean; said forming roll having an arcuate side face with a groove defined therein; said groove in said forming roll defined in section by an arcuate wall formed on a radius R2 from a point offset a distance from the plane of said side face; said distance having a variable length which is a function of the rotation of said forming roll; said supporting means having a surface with a groove defined therein; said groove in said supporting means defined in section by an arcuate wall formed on a radius R from a point in the plane of said surface; the walls defining said groove of said supporting means and said groove of said forming roll together adapted to support a tube in a transverse plane while providing a space of variable depth for the tube to be deformed during the bending operation.
Claim 3
Dependent Claim
31 words
The invention of claim 1 in which said distance increases from a first length d1 to a second length d2 through a given angle of rotation alpha of said forming roll.
Claim 4
Dependent Claim
24 words
The invention of claim 2 in which said distance remains a constant length d2 after rotation of said forming roll through an angle alpha.
Claim 5
Dependent Claim
17 words
The invention of claim 2 in which the progression from length d1 to length d2 is linear.
Claim 6
Dependent Claim
111 words
The invention of claim in which said forming roll is substantially circular in shape and includes a flat surface extending tangentially from said roll and intersecting said arcuate side face; said surface of said supporting means being flat and complementary to said flat surface of said forming roll; a groove defined in said flat surface of said forming roll, said groove in said forming roll flat surface being defined in section by an arcuate wall formed on a radius R2 from a point offset a distance d1 from said forming roll flat surface; the distance d1 plus the length of radius R2 being approximately equal to the length of radius R.
Claim 7
Dependent Claim
12 words
The invention of claim 1 in which R2 is less than R.
Claim 8
Dependent Claim
25 words
The invention of claim 6 in which R is approximately equal to the outside radius of a tube to be received in the tube-bending tool.
Claim 9
Dependent Claim
30 words
The invention of claim 1 in which the wall defining the groove of said forming roll is joined to said side face of said forming roll by diverging flat walls.
Claim 10
Dependent Claim
104 words
In a tube-bending tool: a forming roll; means for turning said forming roll; tube-supporting means adjacent said forming roll; said forming roll having a side face with a groove defined therein of variable depth; said supporting means having a surface with a groove defined therein of constant depth; said grooves of said forming roll and said supporting means being opposed and together defining a tube-receiving recess having a transverse dimension; said transverse dimension having a variable length which is a function of rotation of said forming roll thereby providing a space of variable depth for a tube to be deformed during a bending operation.
Claim 11
Dependent Claim
104 words
In a tube-bending tool: a forming roll; means for turning said forming roll; tube-supporting means adjacent said forming roll; said forming roll having a side face with a groove defined therein of variable depth; said supporting means having a surface with a groove defined therein of constant depth; said grooves of said forming roll and said supporting means being opposed and together defining a tube-receiving recess having a transverse dimension; said transverse dimension having a variable length which is a function of rotation of said forming roll thereby providing a space of variable depth for a tube to be deformed during a bending operation.
Claim 12
Dependent Claim
156 words
In a tube-bending tool: a forming roll; means for turning said forming roll; supporting means for a tube; said forming roll having an arcuate side face with a groove defined therein; said supporting means having a surface with a groove defined therein; said groove of said supporting means being defined in section by a semicircular wall formed on a radius R from a point in the plane of said surface; said groove of said forming roll being defined in section by an arcuate wall formed on a radius R2 from a point offset a distance from the plane of said side face; the radius R2 being less than the radius R with the radius R being approximately equal to the outside radius of the tube to be received in the tube-bending tool; the wall defining the groove of said forming roll joined to the side face of said forming roll by means of diverging flat walls.
Claim 13
Dependent Claim
156 words
In a tube-bending tool: a forming roll; means for turning said forming roll; supporting means for a tube; said forming roll having an arcuate side face with a groove defined therein; said supporting means having a surface with a groove defined therein; said groove of said supporting means being defined in section by a semicircular wall formed on a radius R from a point in the plane of said surface; said groove of said forming roll being defined in section by an arcuate wall formed on a radius R2 from a point offset a distance from the plane of said side face; the radius R2 being less than the radius R with the radius R being approximately equal to the outside radius of the tube to be received in the tube-bending tool; the wall defining the groove of said forming roll joined to the side face of said forming roll by means of diverging flat walls.
Claim 14
Dependent Claim
144 words
In a tube-bending tool: a forming roll; means for turning said forming roll; supporting means for a tube; said forming roll having an arcuate side face with a groove defined therein; said supporting means having a surface with a groove defined therein; said groove of said supporting means being defined in section by an arcuate wall formed on a radius R where R is approximately equal to the outside radius of a tube to be received in the tube-bending tool; said groove of said forming roll being defined in section by an arcuate wall formed on a radius R2; the walls defining the respective grooves of said supporting means and said forming roll being interconnected by diverging flat walls; the shortest distance between said flat walls being less than 2R whereby a squeezing force will be exerted on a tube during a bending operation.
Claim 15
Dependent Claim
144 words
In a tube-bending tool: a forming roll; means for turning said forming roll; supporting means for a tube; said forming roll having an arcuate side face with a groove defined therein; said supporting means having a surface with a groove defined therein; said groove of said supporting means being defined in section by an arcuate wall formed on a radius R where R is approximately equal to the outside radius of a tube to be received in the tube-bending tool; said groove of said forming roll being defined in section by an arcuate wall formed on a radius R2; the walls defining the respective grooves of said supporting means and said forming roll being interconnected by diverging flat walls; the shortest distance between said flat walls being less than 2R whereby a squeezing force will be exerted on a tube during a bending operation.
Claim 16
Dependent Claim
12 words
The invention of claim 11 in which R2 is less than R.
Claim 17
Dependent Claim
32 words
The invention of claim 11 in which said arcuate wall of said forming roll is formed on radius R2 from a point offset a distance from the plane of said side face.
Claim 18
Dependent Claim
27 words
The invention of claim 11 in which said sidewalls are defined entirely within said forming roll and said groove of said supporting means is semicircular in section.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |