WO2007102034A1

WO2007102034A1 - Apparatus for manual bending of tubes

Info

Publication number: WO2007102034A1
Application number: PCT/HR2007/000003
Authority: WO
Inventors: Iilja Zivaljic
Original assignee: Iilja Zivaljic
Priority date: 2006-03-06
Filing date: 2007-01-19
Publication date: 2007-09-13
Also published as: HRP20060092A2; HRPK20060092B3

Abstract

The apparatus for manual bending of tubes comprises the lower lever (A), the die (B), and the upper lever (C). The lower lever has the hexagonal opening (3) into which there is inserted the hexagonal protrusion (11) of the die, fixed with the stopper (4). The upper lever is then placed over the die so that the opening (10) of the pulley (8) is pulled over the guide (22). The tube that is to be bent (26) is inserted between the pulley (8) and the prop (13). Bending is performed by holding the handle (1) of the lower lever with one hand, and gradually turning the handle (16) of the upper lever with the other, where the guide (23) with the roller (24) gradually bends the tube. This is enabled by the two-way stopper (18) that enables bending of tubes in both directions. The spring (20) returns the two-way stopper to the initial position. The apparatus may also be used by holding the die in a vice by its hexagonal protrusion. Turning of the handle (16) bends the tube around the pulley by 0 to 180 degrees. The above described apparatus enables bending of tubes of various diameters, made of various materials, in any direction, and in very much confined spaces.

Description

APPARATUS FOR MANUAL BENDING OF TUBES

INVENTION DESCRIPTION

1. FIELD OF APPLICATION

The invention relates to the apparatus for manual bending of tubes of lesser diameters.

In the International Patent Classification, it is classified as B - Performing operations -

Shaping; B21 - Mechanical metal-working without essentially removing material;

B21 D - Working or processing of sheet metal or metal tubes, rods or profiles without essentially removing material; 9/00 - Bending tubes; 9/12 - Bending tubes by pushing over a curved mandrel or by pushing through a curved die.

2. TECHNICAL PROBLEM

At hydraulic and pneumatic works, often appear the problem of bending of pipes at the very fitting location, usually in confined spaces. This is normally performed on a working bench with a vice, which requires a large room. In lots of cases this is not available, and the bench is located far from the fitting location which causes losses of time. This Kind of operation adversely affects the finaJ work quality.

3. STATE OF THE ART

Presently, there are several apparatuses, tools and machines for bending of tubes. Most tools are designed with one part to be fixed in the vice, around which the tube is bent by a lever. There are other solutions where tubes may be bent while held in the hand, with a manual die with two levers and a fixed die. Shortcomings of such a solution is that the tube can be bent in one direction only, which causes difficulties and is impractical.

The main setback of the existing solutions is that they are impractical in confined spaces, that dies comprise two parts and that allow only one bending combination.

4. DISCLOSURE OF THE INVENTION

The essence of the invention is the apparatus for manual bending of tubes, comprising three separate assemblies that are assembled together before use. One assembly is the lower lever with a hexagonal opening and a stopper. The second assembly is the die with a hexagonal protrusion that is inserted into the hexagonal opening in the lower level when being assembled. The third assembly is the upper lever with a gear with a guide and a two-way stopper that enables bending of tubes in both directions, from 0 to 180 degrees. The upper lever is connected to the die by the guide. The tube is bent with the roller of the upper lever and around the pulley of the die.

The apparatus enables bending of tubes on the very fitting location, in confined spaces, in six working positions.

5. ILLUSTRATION DESCRIPTIONS

Figure 1. shows the apparatus before tube bending - top view.

Figure 2. shows the apparatus after tube bending - top view.

Figure 3. shows the apparatus after tube bending - side view.

Figure 4. shows the lever A - top view.

Figure 5. shows the lever A - side view.

Figure 6. shows the lever A - cross section X-X in the Figure 4.

Figure 7. shows the die B - top view.

Figure 8. shows the die B - bottom view.

Figure 9. shows the die B - side view with partial cross section Z-Z in the Figure 7.

Figure 10. shows the lever C - top view.

Figure 11. shows the lever C - bottom view. Figure 12. shows the lever C - side view with partial cross section Y-Y in the Figure

10. Figure 13. shows the lever C - bottom view without the cover.

6. DESCRIPTION OF THE INVENTION EMBODIMENT AND FUNCTIONING

The apparatus for manual bending of tubes, Figures 1., 2. and 3., comprises three assemblies: the lower lever A, the die B, and the upper lever C.

The lower lever

The lower lever, Figures 4., 5. and 6., has the handle 1 with the head 2. In the head there is the hexagonal opening 3 into which enters the hexagonal protrusion 11 of the die B. The hexagonal opening 3 is connected to the stopper 4 that is permanently pressed by the spring 5 into one of the openings 12 in the hexagonal protrusion 11, thus preventing the die to separate from the lower lever. In the handle 1 there are two openings 6, of various diameters, used for breaking of sown tubes.

The die

The die B, Figures 7., 8. and 9., has the base plate 7 on which there is the hexagonal protrusion 11 with the lateral openings 12 in which enters the stopper 4 of the lower lever A. At the other side of the base plate 7, there is the pulley 8 around the circumference of which there is the flute 9 to receive the tube that is being bent. In the pulley there is the opening 10 for the guide 22 of the upper lever C. At the opposite, narrower, end of the base plate, at the same side as the pulley, there is the prop 13 that rotates around the axel 14. Around the prop there is the flute 15 that holds the tube being bent 26.

The dies are manufactured in several sizes, to receive tubes 26 of various diameters, however their hexagonal protrusions are to be of the same dimensions.

Upper lever

The upper lever C, Figures 10., 11., 12. and 13., has the handle 16, through which passes the guide 22 of the gear 17. The gear is in contact with the two-way stopper 18 that rotates around the axle 19, the spring 20 returning it to the initial position. The gear and the two-way stopper are covered with the protective sheet metal 21. Over the guide 22 there is pulled the holder 23 on the narrower end of which is the roller 24 that rotates around the axle 25. The holder 23 with the guide 22 and the gear 17 can turn by 360 degrees.

When the handle 16 is turned, the holder 23 with the roller 24 bends the tube 26 around the opening 9 in the pulley 8 of the die C. Here the two-way stopper 18 enables incremental turning of the gear, that is, gradual bending of the tube in one direction. If the stopper 18 is pushed against the spring 20 and turned into the opposite position, the tube may be bent in the opposite direction. This is very important when bending tubes in confined spaces.

Functioning of the invention

The apparatus for manual bending of tubes is assembled by fitting the die B onto the lower lever A, where the hexagonal protrusion 11 is inserted in the hexagonal opening 3. Then, the upper lever C is placed above the die B so that the guide 22 is inserted in the opening 10 in the pulley 8.

The apparatus for manual bending of tubes may be operated in two ways.

Way one:

The die B is put into the vice with its hexagonal protrusion 11. The tube 26 is inserted between the pulley 8 and the prop 13. The upper lever C is placed over the die B so that the guide 22 enters the opening 10 in the pulley. The tube that is to be bent 26 is inserted between the pulley 8 and the prop 13. The tube is bent by turning the lever C₁ where the roller 24 on the holder 23 pushes and bends the tube along the opening 9 in the pulley δ.This way, the tube is being gradually bent in one direction, by 0 to 180 degrees.

Way two, Figures 1., 2., 3.:

The hexagonal protrusion 11 of the die B is inserted in the hexagonal opening 3 of the lower lever A. Here the stopper 4 enters one of the holes 12 in the hexagonal protrusion. The upper lever C is placed on the die B₁ so that the pulley 8 is pulled over the guide 22 through the opening 10 in the pulley. The tube that is to be bent 26 is inserted between the pulley 8 and the prop 13.

Bending is performed by holding the handle 1 of the lower lever A with one hand, and gradually turning the handle 16 of the upper lever C with the other, where the guide 23 with the roller 24 gradually bends the tube 26.

The hexagonal opening 3 in the lower lever A and the hexagonal protrusion 11 in the die B enable bending of the tube 26 in six different positions, regardless of the initial position.

The tube is being bent gradually, which is enabled by the two₇way stopper 18 that, when the gear 17 is turned tooth by tooth, preventing its rotation in the opposite direction. When the two-way stopper is turned to the opposite side, the tube is bent in the opposite direction.

The above described apparatus enables bending of tubes of various diameters, made of various materials, in all directions, and in particularly confined spaces.

The referral letters and numbers used in the invention description and the figures, denote the following:

A - The lower lever

1 - handle

2 - head

3 - hexagonal opening

4 - stopper

5 - spring

6 - holes for breaking a sown tube

B - The die

7 - base plate

8 - pulley 9 - tube holding flute 10 - pulley opening 11 - hexagonal protrusion 12 - stopper openings 13 - prop 14 - prop axle 15 - tube holding flute

C - The upper lever

16 - handle

17 - gear

18 - two-way stopper

19 - axle

20 - spring

21 - protective sheet metal

22 - guide

23 - roller holder

24 - tube bending roller

25 - roller guide

26 - tube to be bent

7. INVENTION APPLICATION

The apparatus for manual bending of tubes enables bending of tubes of various diameters and made of various materials. The apparatus is particularly practical for operating in confined spaces, where a single tube is to be bent consecutively in several directions to be fitted into the given space. It is also very practical for bending of several tubes of the same diameter that are to be of the same or different lengths after bending. This is important in engine production, in particular of ship engines and other machines containing numerous tubes to guide a medium.

Claims

PATENT CLAIMS

1. Apparatus for manual bending of tubes, wh e re in it has the lower lever (A), the die (B) and the upper lever (C); the die (B) is connected to the lower lever (A) with the hexagonal protrusion (8) that is inserted into the hexagonal opening (3) of the lower lever (A); the hexagonal opening and the hexagonal protrusion enable six initial positions for bending of tubes (26); the upper lever (C) is connected to the die (B) with the guide (22) that is inserted into the opening (10) in the pulley (8) of the die (C); the gear (17) and the two-way stopper (18) enable gradual binding of the tube (26) by manual turning of the handle (16) of the upper lever (C) by 0 to 180 degrees, in both directions.

2. The apparatus, as claimed in Claim 1., wh e re in the said lower lever (A) has the handle (1) in which there is the hexagonal opening (3) and in which handle there is the stopper (4) pushed by the spring (5) into the hexagonal opening, in which handle (1) there are the openings (6) of various diameters intended for breaking of sown tubes.

3. The apparatus, as claimed in Claim 1., wh e re in the said die (B) has the base plate (7), at one side of the base plate there being the hexagonal protrusion (11) with the lateral openings (12), and at the other side of the base plate there being the pulley (8) with the opening (10) around which the tube (26) is bent, and at the latter side of the base plate also there being the prop (13) that holds the tube (26) in position during its bending.

4. The apparatus, as claimed in Claim 1., wh e re in the said upper lever (B) has the handle (16) that is manually turned when a tube is being bent, at one side of the handle there being the gear (17) that enables gradual bending of the tube, there being also the two-way stopper (18) that prevents the gear to rotate in the opposite direction, at the opposite side of the handle (16) there being the holder (23) with the roller (24) that enable bending of the tube (26) by 0 to 180 degrees.

5. The apparatus, as claimed in Claim 4., wh e re in the said two-way stopper (18), when turned to the opposite side, enables bending of the tube (26) in the opposite direction.

6. The apparatus, as claimed in Claim 1., wh e re in the protrusion (11) of the die (B) may be held in a vice, without the lower lever (A), where the upper lever (C) is turned manually in the pulley (8), bending thus the tube (26) by 180 degrees.