WO2019048301A1

WO2019048301A1 - Wrench

Info

Publication number: WO2019048301A1
Application number: PCT/EP2018/073189
Authority: WO
Inventors: Josef Messmann
Original assignee: Messmann Service Gmbh
Priority date: 2017-09-08
Filing date: 2018-08-29
Publication date: 2019-03-14
Also published as: DE202017105451U1

Abstract

The invention relates to a wrench (1) in the form of an open end wrench for screwing on a nut (2), comprising a handle (3) and an engagement portion (4). The handle (3) and the engagement portion (4) are connected to one another in a force-transmitting manner, such that a torque can be exerted on the engagement portion (4) by means of the handle (3). The engagement portion (4) is open-ended such that it laterally circumferentially surrounds, in part, a nut space (5). In a further development of the invention, the engagement portion (4) has a plurality of lugs (6) which extend radially inwardly into the nut space (5) starting from an edge (7) of the engagement portion (4).

Description

wrench

Description Introduction

The present application relates to a wrench according to the

Preamble of claim 1. This comprises a mouth-shaped engagement portion, which includes a mother room partially revolving.

[02] For the purposes of the present application, an "engagement section" is the section by means of which the wrench can engage a nut to be screwed in order to transmit torque to the nut instead of.

[03] For the purposes of the present application, the term "mouth-shaped" is understood to mean a shape that is open to at least one side.) In this respect, a mouth shape differs in particular from a ring shape which not only surrounds a parent space partially revolving but completely encircling Design of the

In particular, the engagement key makes it possible to use the wrench for screwing union nuts, which are typically used along strands of wire, to ensure a permanent transmission of force and possibly a tight connection of second conduit sections. Such compounds have the peculiarity that the lines on both sides of the nut further extend, so that an annular engagement portion formed in the form of a ring spanner

Wrench can not be brought into engagement with the nut. For this purpose, an open-end wrench with a mouth-shaped engagement section is then mandatory

use.

[04] For the purposes of the present application, the "parent space" describes a space enclosed by the engagement portion, in which the respective nut to be screwed is to be placed, in order to engage the wrench determined certain nut diameter, so that a nut of appropriate size can fit together fit the engagement portion of the wrench. State of the art

[05] Wrench of the type described above are already known in the art. In particular, for screwing particularly large nuts, such as union nuts, are typically called so-called hook wrench used. These have a hook-shaped engagement portion, which has a nose projecting radially inwards in the direction of the parent space at an end facing away from the handle. Such a hook wrench is particularly well suited to cooperate with particularly large locknuts, which are used for example in the form of union nuts for connecting large cross-sectional fluid lines, for example in breweries and dairies.

However, such hook wrenches have the particular disadvantage that they can easily slip off the respective mother. This is due in particular to the sometimes considerable torques which are to be applied in order to loosen or firmly tighten a corresponding nut. Especially in the brewing industry, it is due to such

Slipping already several times to accidents, as in the course of jerky

Release the applied torque strike the user of the wrench and can seriously injure.

task

[07] The present application is therefore based on the object, a

To provide wrench whose application is less dangerous than wrenches according to the prior art.

solution

The underlying object is achieved by means of a wrench with the features of claim 1. Advantageous embodiments will be apparent from the dependent claims 2 to 7.

[09] The wrench according to the invention has a plurality of lugs in its engagement section. These extend from an edge of the

Engaging portion radially inwardly into the mother room inside.

[10] The wrench according to the invention has many advantages. In particular, a positive connection with the respective nut is significantly improved by means of the plurality of lugs, so that an accidental slipping of the wrench is greatly reduced. Furthermore, by means of the noses of the positive connection between the wrench and the respective nut is formed such that the wrench holds after attaching to the mother alone to the mother, that is, in particular, can be released by a user of the wrench without falling down. This is particularly advantageous for the use of such a wrench in many cases, since the wrench can be especially easy to follow. Furthermore, the wrench according to the invention can be compared to a hook key described above more easily brought into positive engagement with a respective mother, in particular a game between the

Wrench and the nut is reduced to a minimum. Furthermore, an accidental tilting of the wrench with the nut hardly occur, so that the wrench according to the invention can be easily removed from a nut.

[1 1] In an advantageous embodiment of the wrench according to the invention, the engagement section holds the nut space - with reference to a screw axis of the nut

Wrench - in an angular range of at least 60 °, preferably at least 180 °, more preferably at least 200 °, a. In this way, the wrench encloses the mother space and thus also a respective nut to be screwed in a particularly advantageous scope, so that by means of the noses a reliable positive connection with the mother can be produced. Furthermore, it may be advantageous if the lugs are arranged distributed equidistantly along the edge of the engagement portion. A corresponding embodiment is typically recognizable in each case to be screwed nuts, so that the

Wrench is particularly well suited to interact with such nuts. Preferably, at least the - with respect to the screw axis of the wrench - angularly furthest away from each other nose relative to the screw axis by at least 140 °, preferably offset by at least 160 °, against each other. Such an offset between the noses contributes to the positive connection between the

Engaging portion as a whole and the respective screw to be screwed mother, since the noses can penetrate deep into the complementary grooves of the nut after placing the wrench on the nut. Furthermore, slipping is almost impossible, as a lateral removal of the wrench from the mother - if at all - is hardly possible.

Advantageously, the wrench according to the invention in its engagement section on at least four lugs. The higher number of lugs promotes a force transmission from the wrench into the respective nut, wherein the transmission of the total torque is distributed to the individual noses. The use of multiple noses thus reduces the force to be transmitted per nose, whereby the risk of accidental slippage or relative evasive movements between

Wrench and nut are further reduced. [14] The wrench according to the invention further ausgestaltend the handle is designed cranked so that an engagement plane of the engagement portion and a handle axis of the handle are arranged offset relative to each other. Such an embodiment of

Wrench may be particularly favorable to provide sufficient space for rotation of the handle relative to the screw axis, in particular in confined spaces, which are often to be complained, the position of the handle at least a bit far away from the immediate environment of the mother away is. For the purposes of the present application, the term "intervention level" is understood to mean that level which is defined by the

Engaging portion is clamped, in particular the lugs within the

Intervention level are arranged. By contrast, the "handle axis" describes a central axis of the handle

Central axis of the handle and the engagement plane at least substantially, preferably completely, parallel and offset from each other, extend.

The wrench according to the invention is further particularly advantageous if it has a stop which on a - relative to the screw axis of

Wrench considered - upper end of the engagement portion is formed. The stopper is designed such that it starts from the edge of the

Engaging portion protrudes radially inwardly into the nut space. The stop has the particular advantage of limiting movement of the wrench relative to the respective nut in a direction parallel to the screw axis. In other words, the stopper causes the wrench to be placed only to some extent on the nut and in particular not "slip over" the nut

Aufsetzposition of the wrench in which the wrench is pushed onto the maximum mother, abuts a top-side stop surface of the mother and blocked in this way further pushing the wrench on the mother. Preferably, the stopper is formed such that it extends along the entire edge of the engagement portion.

In a further advantageous embodiment, at least one of the lugs, preferably all lugs, on a - relative to the screw axis of the

Wrench viewed - lower end has a thickened base. The For the purposes of the present application, "thickening" of the base is reflected in the fact that a cross section of the base considered perpendicular to the screw axis exceeds a cross section of the remaining nose, whereby it is further conceivable that the base is thickened relative to the remaining nose The result is that the lugs engage positively with the respective nut and, in a sense, form a lower stop so that the wrench does not extend beyond the thickened base in a direction parallel to the nut Screw axis can be moved relative to the mother.

Advantageously, the base is adapted to the grooves such that a cross section of the base falls below a cross section of the associated groove, so that the nose together with the thickened base can be guided through the groove. However, since the base protrudes radially over the associated nose, it is still suitable as a stop on the mother. At the moment of a power transmission, namely, the wrench is rotated relative to the nut about the screw axis, so that the thickened base form-fitting with a

Engages underside of the nut. As a result, the wrench as a whole can no longer be pulled upwardly from the nut as soon as it is used, that is to say as soon as a torque is transmitted between the wrench and the nut.

[18] Particularly preferable is such a wrench, which in his

Engaging portion both a stop and on at least one nose has a thickened base. It is understood that such a wrench can only be placed laterally on a nut, because it can be pushed due to the thickened base neither "from above" nor because of the attack "from below" in a direction parallel to the screw axis on a nut. A trained in this way

Wrench forms a triple positive engagement with the associated utter, namely in the direction of rotation about the screw axis by means of the lugs and in both directions parallel to the screw axis by means of the stop and the thickened base of each nose. embodiments

The wrench according to the invention is described below with reference to a

Embodiment, which is shown in the figures, explained in more detail. It shows:

Fig. 1: A view of a wrench according to the invention in one

Perspective from below. 2 shows a detail of an engagement section of the wrench according to FIG. 1 in a lateral perspective, FIG.

3 shows a detail of an engagement section of the wrench according to FIG

1 in a perspective from below.

4 shows an interaction of the wrench according to FIG. 1 with a complementary nut in a perspective from above, FIG.

Fig. 5: An interaction of the wrench according to Figure 1 with a complementary nut in a perspective from below and

Fig. 6: A cross section through an engagement portion of an inventive

Wrench.

[20] An embodiment, which is shown in FIGS. 1 to 5, comprises a wrench 1 according to the invention, which comprises a handle 3 and an engagement section 4. The handle 3 is connected to form a crank 15 to the engaging portion 4 in a torque transmitting manner. The crank 15 causes a handle axis 9 of the handle 3 in parallel and spaced from an engagement plane 8 of

Engaging section 4 extends. The engagement level 8 describes a center plane of the engagement portion 4. The wrench 1 may be formed in particular of tool steel, wherein the handle 3 and the engagement portion 4 may be welded together, for example. [21] The engaging portion 4 is formed part-circular, wherein it encloses an inner mother space 5 partially. In this nut chamber 5, the wrench 1 can accommodate a nut to be screwed 2, which results, for example, from FIGS. 4 and 5. In this case, the engagement portion 4 of the wrench 1 is typically matched to a specific, assembled type of nuts 2, so that the engagement portion 4 can engage positively with the respective nut 2.

In order to produce by means of the wrench 1 a torque-transmitting connection with the respective nut 2, the engagement section 4 here comprises a total of four lugs 6, which extend from an edge 7 of the engagement portion 4 radially inwardly into the nut chamber 5 inside. The individual lugs 6 are distributed equidistant along the engagement portion 4, so that they are adapted to engage positively with complementary grooves 14 of a respective nut 2. This engagement has the consequence that the wrench 1 in cooperation with a respective nut 2 can not be freely rotated relative to the nut 2 about a screw axis 11, which is oriented perpendicular to the engagement plane 8 and, so to speak, a center of the nut space. 5 includes. In other words, the nut 2 and the wrench 1 thus cooperate in such a way that the exercise of a force oriented parallel to the engaging plane 8 leads to the exertion of a torque on the nut 2, so that these are moved around the nut

Screw axis 11 is screwed. The here four noses 6 offer the particular advantage that a

Power transmission between the wrench 1 and the nut 2 distributed over several locations takes place, wherein at each point, namely at each of the lugs 6, a comparatively small force between the wrench 1 and the nut 2 acts. In this way, both wear of the nut 2 and the engaging portion 4 of

Wrench 1 significantly reduced. The much more important advantage, however, is that it can not come to an uncontrolled slipping of the wrench 1 of the nut 2, as it is known and feared in particular by the known hook spanners.

[24] This slip-resistance also contributes to the fact that the lugs 6 furthest away from one another in the engagement section 4 - relative to the screw axis 11

considered - have an angular offset of about 180 ° here. These lugs 6 are those arranged at opposite ends of the engaging portion 4. The high angular offset between these "outer" lugs 6 causes the wrench 1 can only be placed in a direction parallel to the screw axis 11 on the respective nut 2. Thus, it is understood that even removing the wrench 1 exclusively in this direction Thus, in particular, peeling off in a direction parallel to the engagement plane 8 is blocked, which of course also relates to accidental removal, that is to say slippage, which is why the wrench 1 shown here is slip-proof, as a result of which

Injury risk in the course of screwing a respective nut 2 is drastically reduced.

The wrench 1 shown here is further at an upper end 12 of its engagement portion 4, a stop 10 which is formed here in the form of a continuous collar. The stop 10 extends over the entire engagement portion 4 and extends from the edge 7 radially inwardly into the nut space 5. The stop 10 thus effectively causes a reduction in diameter of the engagement portion 4 at its upper end 12 This has the consequence that the

Wrench 1 can only be pushed up to the stop 10 on a nut 2. Such a situation can be seen in particular from FIG. In other words, it is not possible to "pull over" the wrench 1 via the nut 2. In this way, the stopper 10 provides a further assurance of

Positive connection between wrench 1 and nut 2, since in addition to a lateral slipping further schraubachsparalleles slipping of the

Wrench 1 is prevented by the nut 2. Additionally or alternatively, it is conceivable to equip the lugs 6 at a lower end 13 of the engagement portion 4 each with a thickened base 16. This causes the lugs 6 engage positively by means of their thickened bases with the nut 2 and can not be moved along the grooves 14 of the nut 2 parallel to the screw axis 11 upwards. A corresponding embodiment of an inventive

Wrench 1 Figure 6 is removable. There, the base 16 is formed such that its cross section below a cross section of the complementary groove 14 of the nut 2, so that the nose 6 can be passed together with the thickened base 16 axially through the groove 14. However, the base 16 contributes to an improvement in the hold between the wrench 1 and the nut 2. As soon as a torque is exerted on the wrench 1 and transmitted to the nut 2, a minimal relative movement between the wrench 1 and the nut 2 takes place until the lugs 6 abut with their lateral flanks on complementary flanks of the respective grooves 14. In such a "fitting position", which can be seen in Figure 6, the thickened base 16 engages positively with a bottom 17 of the nut 2 and thereby prevents withdrawal of the wrench 1 parallel to the screw axis 12 upwards.

Please list

1 wrench

2 mother

3 handle

4 engagement section

5 mother room

6 nose

7 edge

8 intervention level

9 handle axis

10 stop

1 1 screw axis

12 upper end

13 lower end 4 groove

15 crank

16 base

17 bottom

Claims

protection claims

A wrench (1) in the form of a wrench for screwing a nut (2) comprising

a handle (3) and an engagement portion (4),

wherein the handle (3) and the engagement portion (4) are interconnected in a force-transmitting manner so that a torque can be exerted on the engagement portion (4) by means of the handle (3),

wherein the engagement portion (4) is formed mouth-shaped, so that it has a

Mutterraum (5) partially encircling laterally,

characterized in that

the engagement portion (4) has a plurality of lugs (6) extending radially inwardly into the nut space (5) from an edge (7) of the engagement portion (4).

2. wrench (1) according to claim 1, characterized in that the engagement portion (4) the nut space (5) in an angular range (15) of at least - relative to a screw axis (1 1) of the wrench (1) - 160 °, preferably at least 180 °, more preferably at least 200 °.

3. wrench (1) according to claim 1 or 2, characterized in that the lugs (6) are arranged distributed equidistant along the edge (7) of the engagement portion (4), wherein preferably at opposite ends of the engagement portion (4) arranged lugs (6) - relative to a screw axis (1 1) of the wrench (1) - an angular offset of at least 140 °, preferably at least 160 °. respectively.

4. wrench (1) according to one of claims 1 to 3, characterized

characterized in that the engagement portion (4) has at least four lugs (6).

5. wrench (1) according to one of claims 1 to 4, characterized

in that the handle (3) is designed to be cranked such that a Engagement level (8) of the engagement portion (4) and a handle axis (9) of the handle (3) are arranged offset relative to each other.

6. wrench (1) according to one of claims 1 to 5, characterized by a stop (10) on a - relative to a screw axis (1 1) of the wrench (1) considered - upper end (12) of the

Engaging portion (4) is formed, wherein the stop (10), starting from the edge (7) of the engaging portion (4) projects radially inwardly into the nut chamber (5).

7. wrench (1) according to claim 6, characterized in that the stop (10) along the entire edge (7) of the engagement portion (4).

8. wrench (1) according to one of claims 1 to 7, characterized

in that at least one of the lugs (6), preferably all lugs (6), on a - relative to a screw axis (1 1) of the

Wrench (1) viewed - lower end (13) has a thickened base (16) whose perpendicular to the screw axis (1 1) considered

Cross-section exceeds a cross section of the remaining nose (6).