DE9418502U1 - Cutting and bending tool - Google Patents

Description

The innovation relates to a combination tool according to the preamble of claim 1.

A tool corresponding to the generic term of the claim is commercially available and is referred to as a side cutter, a center cutter or a diagonal cutter, depending on the position of the active parts.

The disadvantage of such tools is that they are single-purpose tools.

that they exclusively

The innovation is based on the task of improving a generic tool so that it can be used for standard tasks on the one hand, but can also fulfil various functions.

In some applications, such as in the field of dental technology or orthodontics, different

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ORBIS-Werk Groten GmbH+Co. KG · Ridderstraße 37 · D 48683 Ahaus Telex 89717 orgrc>a"-Tl!efon a25.eTi^**Q'Te!fax 02561 /424-24 : HR Ahaus A 1047 ■ priS· Srften SmJaH. KR^AUauS B 127 · Founded in 1929 CEO: Hans Geäöher -·&Egr;&Agr;&Ngr;^^&igr;>^&Ggr;.·4&thgr;&thgr;7^822.:&ugr;8&Tgr;-&ohgr;&Ngr;&Ggr;.: DE 123786937

to carry out operations that previously required the use of different tools.

This problem underlying the innovation is solved for the case described below by the embodiment according to the characterizing part of claim 1.

For example, the facebows commonly used in orthodontics have to be adjusted to the size of the patient in various cases. To do this, it is advantageous to start with a standard size of the facebow and shorten it if necessary in order to avoid having to stock different sizes of the expensive bows. After shortening, a new hook has to be formed on the bow.

The shortening is usually carried out using a special side cutter or bolt cutter. Commercially available multi-purpose gripping pliers are usually used to bend the hook. This does not guarantee that the hook will be formed precisely and uniformly.

In order to reduce the stocking and use of various special tools and aids as well as the time required, the innovation enables the following work steps to be carried out with one tool:

1. Shortening the facebow,

2. Pre-bending the hook,

3. Re-bending the hook.

Since the facebows are made of special quality spring-hard steel wire, they require high separating forces that are difficult to achieve with simple side cutters.

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Therefore, in addition to the standard cutting edges (6, 7), the new device has offset grooves in the joint area, which serve as joint cutters. This shears the wire, unlike the usual side, center or diagonal cutter, where the wire is separated by the wedge effect. This means that even harder wires than usual can be cut with significantly less effort.

The arrangement of the grooves, which are matched to the diameter of the facebow wire, is advantageously designed in relation to the angle to the joint axis and the width in such a way that when the wire comes into contact with the resulting shear edges (19, 20), the outer edges (21, 22) simultaneously position the wire so that it lies parallel to the joint axis in the grooves.

After shortening the facebow using the joint cutter, the end of the wire is inserted into the recess (10) to the bottom. This determines the length of the resulting hook. The diameter and depth of the recess should be adapted to the desired hook size and the wire used.

The groove-shaped extension (12) of the recess (10) now allows the wire to be bent with the thumb towards the outside of the leg and further deformed up to 180° from the original direction of the wire. The groove-shaped extension (12) guides the wire.

The inner radius of the hook is determined by the curvature radius of the groove base, so that this is advantageously adapted to the radius to be created. The curvature radius must be reduced compared to the inner radius so that

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The spring-hard wire springs back to produce the desired radius.

The hook is bent using the groove-shaped recess (16) in the active part (7) and the hole (17) in the jaw (4). To do this, the pre-bent hook is inserted with the short end into the hole (17) and the longer part is inserted into the groove-shaped recess (16) and the pliers are closed.

The groove-shaped recess (15) prevents damage to the wire.

The groove-shaped recess (16) ensures that the pre-bent hook is held in place during the subsequent bending process.

Advantageously, the groove-shaped recesses (15, 16) are circular or V-shaped and are inserted so deeply into the active parts (6, 7) that the wire is not crushed or damaged when the tool is closed.

In addition, the recesses are advantageously placed near the joint in order to keep the rest of the active parts usable for normal separation processes.

Advantageously, the distance between the groove-shaped recesses and the bore (17) from the joint axis should be the same size in order to prevent the hook from tilting or twisting during re-bending.

The distance between the hole (17) and the base of the groove-shaped recess (16) should advantageously correspond to the outer width of the hook, reduced by the amount of the elastic return.

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springiness during deformation, so that after removing the hook from the device the desired hook width is obtained.

The innovation is explained in more detail below using the drawings. The

Fig. 1 the overall view of a pliers-like combination tool,

Fig. 2.a the enlarged top view of the head of the tool

Fig. 2.b the side view of the same Fig. 3 a section through the leg attachment of the same,

Fig. 4 a side view of the joint area of the combination tool opened for shearing a wire, and

Fig. 5 is a top view of the hook to be manufactured.

In Fig. 1, the combination tool shown is shown with 1 and 2 as the legs, 3 as the joint and 4 and 5 as the jaws. The jaws include the active parts 6 and 7. A diagonal cutter is shown as an example.

The recess in the leg attachment corresponding to the main claim 1 is marked with 10 in Fig. 2 and the groove-shaped expansion essentially towards the central axis (8) is marked with 12. It serves to pre-bend the hook.

The advantageous design of the recess and the widening is shown in detail in Fig. 3 in a section through the leg attachment. The recess (10) merges into the widening

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(12). This extension extends to the outside of the leg (1), the base being advantageously curved in the form shown relative to the central plane in order to ensure a uniform bending radius.

Fig. 2.a also shows the advantageously designed recesses (15, 16) in the active parts (6, 7), which together with the bore (17) represent the device for reshaping the hook. The shape and position of the recesses are designed in the advantageous form described above. The groove-shaped recesses (15, 16) can also be V-shaped or prismatic.

Fig. 2.b shows the side view of the combination tool with the joint parts belonging to the legs 1 and 2, into which the active parts (13, 14) of the joint cutter are incorporated in the rest position, ie with the tool closed.

To shear a wire, the tool must be opened and the wire inserted into the resulting gap. This is shown in detail in Fig. 4. The width and angular position of the active parts are advantageously designed so that when the wire (23) is touched by the shearing edges (19, 20), the outer edges of the grooves (21, 22) simultaneously touch the wire and thus hold it parallel to the joint axis when cutting.

Fig. 5 shows the hook (18) of a facebow to be manufactured in plan view.

Claims (13)

¹ ^« #· " · • ·» · •♦ · · ■MMjg , ■ ... i^g W%? ■'■*' - Sf* ■ stfach1355 · D 48663 Ahaus • '&ngr;. \ GS-tested according to DIN/ISO Quality pliers Quality Pliers Quality pins Quality assurance Quality assurance &Pgr;&Egr;&Ngr;&Sgr;&Egr;&Sgr;&Pgr;&Ogr;&Igr;&Ogr;&Tgr;&EEgr;&Tgr;&Ogr;&Sgr; 17 November 1994 TL-AHG/Ve "Cutting and bending tool" Protection claims: 1. Pliers-like combination tool with two handle parts (1, 2), a joint (3) and two active parts (6, 7) designed as jaws (4, 5) of a pair of pliers, which are designed with more or less sharp edges and stand in front of each other and are arranged parallel or at a certain angle to the central axis (8) of the tool, characterized in that in the leg attachment (9), i.e. near the joint in the direction of the leg end, a recess (10) is made perpendicular to a central plane defined by the contact surfaces of the two legs within the joint, which continues in the form of a groove below the pliers surface (11) essentially perpendicular to the central axis and in the direction of the outside of the legs, the base of the groove (12) rising from the vertical recess in the direction of the pliers surface and falling again towards the outside of the leg, i.e. is curved in relation to the central plane. -2- ORBIS-Werk Groten GmbH+Co. KG ■ Ridderstrasse 37 · D 48683 Ahaus Telex 89717 orgrqti _; "!jälefon,e2564/424^-U.-„Fax 02561/424-24 KG: HR Ahaus A 1047 · ßtaG: Brttfen'J3n{bH)· HR Afeai& B 127 · Founded in 1929 Managing Director: Hans Geecher: EAl*-i)BQiNr.4!X)?§8&3 _: 1yST-IdNr.: DE 123786937 2. Combination tool according to claim 1, characterized in that the vertical recess (10) is round. 3. Combination tool according to claim 2, characterized in that the vertical recess (10) is matched to the hook (18) in terms of depth and diameter. 4. Combination tool according to one of the preceding claims, characterized in that the radius of curvature in relation to the central plane of the base of the groove-shaped extension (12) of the vertical recess (10) is adapted to the inner radius of curvature of the hook (18) taking into account the elastic component during deformation. 5. Combination tool according to one of the preceding claims, characterized in that groove-shaped recesses (15, 16) are made in the active parts (6, 7) at the same distance from the axis of rotation and perpendicular to the center plane. 6. Combination tool according to claim 5, characterized in that the groove-shaped recesses are introduced in the vicinity of the joint. 7. Combination tool according to one of the preceding claims, characterized in that the groove-shaped recesses are circular-arc or V-shaped and symmetrical to the central axis. 8. Combination tool according to one of the preceding claims, characterized in that a bore is made in one or both jaws (4, 5) perpendicular to the center plane. -3- 9. Combination tool according to claim 8, characterized in that the bore is made at the same distance from the joint axis as the groove-shaped recesses (15, 16). 10. Combination tool according to claim 9, characterized in that the bore (17) is made at a distance from the base of the groove-shaped recess (16) which is adjusted to the hook width and which is reduced by the amount of elastic springback during re-bending compared to the finished size. 11. Combination tool according to one of the preceding claims, characterized in that grooves (13, 14) are introduced into the joint parts of each leg substantially perpendicular to the center plane, so that these are arranged offset one above the other after the individual parts have been joined together. 12. Combination tool according to claim 11, characterized in that the grooves are slightly skewed to the joint axis. 13. Combination tool according to claim 12, characterized in that the grooves are adapted to the wire diameter with regard to their tangential width and the angle of their inclination with respect to the joint axis in such a way that when the wire is touched by the resulting shearing edges (19, 20), the outer edges (21, 22) also touch the wire.