EP2813322A2 - Ratchet tool - Google Patents

Abstract

The invention relates to a ratcheting tool (10) with a lever arm (16) and with a cup-shaped housing (12). The pot-shaped housing (12) has a bottom (22) and at least one side wall (20) on which the lever arm (16) is provided. In the housing (12) a ratchet mechanism is arranged. A housing cover (30) covers the ratchet mechanism in the housing (12). With the ratchet mechanism, a drive part (52) is connected.

Description

Technical area

1. a) einen Hebelarm
2. b) ein topfförmiges Gehäuse mit einem Boden und wenigstens einer Seitenwand, welches an dem Hebelarm vorgesehen ist,
3. c) ein in dem Gehäuse angeordneter Ratschenmechanismus,
4. d) eine Gehäuseabdeckung, welche den Ratschenmechanismus in dem Gehäuse abdeckt,
5. e) ein Antriebsteil, welches mit dem Ratschenmechanismus verbunden ist.

The invention relates to a ratchet tool comprising:

1. a) a lever arm
2. b) a pot-shaped housing having a bottom and at least one side wall, which is provided on the lever arm,
3. c) a ratchet mechanism disposed in the housing,
4. d) a housing cover which covers the ratchet mechanism in the housing,
5. e) a drive part which is connected to the ratchet mechanism.

State of the art

Such ratchet tools are used for tightening and loosening of screw connections, especially in mechanical engineering or tool making in assembly technology. The ratchet tools have a lever-shaped body. At one end of a handle is usually provided. At the other end a cup-shaped housing is arranged. By doing Housing is the ratchet mechanism with a drive part. The ratchet mechanism includes a rotating member and a locking member. The drive part is fixed to the rotary part, provided that the rotary part does not itself at the same time forms the drive part. The blocking part allows the rotating part to rotate in one direction only. With a switch the direction of rotation can be set. The drive part is often designed as an external square profile on which plug-in tools are plugged in a form-fitting manner. These plug-in tools therefore have a suitable inner square profile. Usually, such tools are also referred to as a ratchet or ratchet wrench with internal profile for screw drive.

In the DD 231025 A1 is described a Aufsteckratsche, which is equally well suited for the tightening and loosening of screw. The Aufsteckratsche is designed switchable and allows safe transmission of even large torques. Due to their small outer dimensions, the ratchet ratchet allows use in confined mounting locations. In a cylindrical ratchet body four pawls offset by 90 ° are arranged under spring pressure for right and left rotation, the two opposite pawls are intended for one direction of rotation and are brought for the purpose of changing direction by turning a reversing plate in or out of engagement with the ratchet wheel can. The use of two pawls each for one direction of rotation enables the transmission of large torques and ensures a balanced introduction of force when operated with a two-armed lever and thus a high level of safety against slipping.

In the DE 20 2012 104 413 U1 a ratcheting tool with a tool head is described wherein the tool head has an insert coupled to a ratchet mechanism for transmitting torques and placed on the insert or a screw , The ratchet mechanism has a rotary part for torque transmission, which has a toothing on its front side, in which a locking element engages. In this case, the ratchet mechanism is arranged in a housing and / or provided a lever for transmitting power to the ratchet mechanism. The ratchet mechanism is thus protected against contamination.

The DE 1778996 U discloses reversible sockets ratchets used to drive sockets and the like. The known ratchet can be used both for right-hand drive, as well as for left-hand drive. The respectively used drive direction is effected by a locking mechanism, which only takes the ratchet wheel in the desired drive direction. There are already several embodiments of such switching devices known. So it is known from the ratchet wheel by lever-like pawls, which engage in the desired drive direction in the ratchet wheel to take. In these ratchets, the pawl is pivoted by a switching lever which lies on the back of the ratchet housing in a recess and is held by a bridge over it.

The WO 96/011774 discloses a ratchet wrench with intermeshing gears. The ratchet wrench includes a stem having a forward end and a rearward portion, the forward end having a housing with a stepped, circular opening and axially aligned first gear teeth within the stepped opening. The ratchet wrench has a cover plate which is connected to the front end of the shaft. An ergonomically shaped handle is arranged on the back of the rear part of the shaft to touch. The cover plate is assigned to the housing of the gear arrangement. It has one or more fasteners and serves to cover and depress a compression spring and to prevent the ingress of dirt or grease in the covered area.

The ratchet mechanism is seated in the described prior art in a pot-like housing which is closed with a housing cover. The cover avoids, for example, that the ratchet gear dirty. However, the known ratchets or ratchets have the disadvantage that the cover with one or more screws or rivets is attached to the housing. With frequent use and vibration, such fasteners can easily solve. In the process, the entire ratchet mechanism, including the drive part and cover, then comes off the housing.

Another disadvantage of the ratchets or ratchets, as they are known from the prior art, is that they are relatively expensive and therefore expensive to manufacture. Because the housing must have suitable threaded holes and the screws are screwed in an additional operation.

Disclosure of the invention

The object of the invention is therefore to avoid the disadvantages of the prior art and to provide a ratchet tool in which no small parts, such as screws or rivets, can solve.

• f) die Seitenwand des Gehäuses und/oder das Antriebsteil eine nutenförmige Ausnehmung aufweisen, in welcher Befestigungsmittel zur Befestigung der Gehäuseabdeckung vorgesehen sind.

According to the invention the object is achieved in that in a ratchet tool of the type mentioned

• f) the side wall of the housing and / or the drive part have a groove-shaped recess, in which fastening means are provided for fastening the housing cover.

The advantage of the ratchet tool according to the invention is that no small parts can solve more. Especially in aircraft maintenance or aircraft construction, no small parts may get into the turbine blades. Such could destroy the turbines with catastrophic consequences. Often it did not even notice when a screw or rivet broke. In the ratcheting tool according to the invention, the housing cover is no longer fastened with screws. The housing cover is fixed with fastening means in a groove of the side wall of the housing or of the drive part. The groove-shaped recess is usually located on the inside of the cup-shaped housing. Tab-shaped fasteners engage in this groove-shaped recess to secure the housing cover to the housing of the ratchet tool. This can be avoided that small parts, such as screws or rivets are used to attach the housing cover. These can in fact solve themselves in the worst case. Through a groove in the drive part, a fastening means, such as a correspondingly wide designed snap ring, the Fix the housing cover to the housing. The snap ring sits in the groove-shaped recess of the drive part and thus can not slip. This holds the housing cover firmly in its position without screws and the like.

In a preferred embodiment of the invention, the housing cover of the ratcheting tool according to the invention is wholly or partly made of plastic. This is advantageous in the production. An injection molded part can be created quickly and inexpensively. The housing cover made of plastic can also be easily mounted on the housing of the ratchet tool, since the plastic is regularly elastic. The housing cover or the fastening means can then be easier to bring into the groove-shaped recess. The elasticity also has the advantage that the plastic has a damping effect and absorbs vibrations. During assembly, the fitter's arm does not tire so quickly.

Preferably, a plastic edge or a part of the plastic edge of the housing cover engages in the groove-shaped recess of the side wall of the housing ratchet tool for fastening for locking. Due to its elasticity, it is very useful to make the edge or part of the edge of the housing cover made of plastic. Because of its flexibility, this plastic edge can be more easily pressed or latched into the groove-shaped recess than, for example, a rigid metal edge.

A particularly advantageous embodiment of the invention results from the fact that the edge of the housing cover has a Kliplippe, which is clipped as a fastening means in the groove-shaped recess of the housing of the ratcheting tool for closing. This type of attachment of the housing cover allows easy fixation on the housing, even with a non-elastic material for the housing cover. The Kliplippe engages the housing cover firmly on the housing and can be solved only with a special tool or by force from the housing wall.

In a further advantageous variant of the ratcheting tool according to the invention, the groove-shaped recess of the side wall of the housing clips in to close it the housing cover. On the one hand, there is the possibility that the housing cover or its edge or part of its edge is clipped into the groove-shaped recess, on the other hand, of course, the groove-shaped recess may of course contain a mechanism so that it clasps into the housing cover. Basically, combinations of these variants are conceivable.

An advantageous embodiment of the ratcheting tool according to the invention further consists in the housing cover having a plastic bottle which engages in inner recesses of the side wall of the housing for closing the housing. The inner recesses are provided on the inside of the housing. As soon as tabs of the housing cover are inserted into these recesses, a particularly good, secure and firm fit of the housing cover is ensured. Incidentally, this achieves a simple assembly of the housing cover on the housing of the ratchet tool.

A particularly preferred embodiment of the ratchet tool according to the invention further results from the fact that the fastening means are designed as two fastening elements which attach the housing cover to the drive part of the ratchet mechanism, wherein the drive part is guided through the housing cover and through the housing, a first fastening element above the housing cover and a second fastener is disposed outside the housing. The attachment of the housing cover can thus be achieved solely by a fastening means, e.g. Circlips are provided above or outside the housing bottom on the drive part in the groove-shaped recess. The housing cover and the housing can each have a recess, so that the fastening means are arranged in the recess in order to increase the height unnecessarily. The fastening means arranged outside the housing stabilizes the hold of the housing cover on the drive part. Of course, a combination of the variant with the groove-shaped recess in the side wall is conceivable.

In a further advantageous embodiment of the invention, the ratcheting tool is designed as a ratchet, wherein the drive member through an opening of the Housing cover is guided. Straight ratchets are particularly suitable for this type of housing covers. Because creaking are often used for example in the maintenance and installation of aircraft. In this case, the housing cover has the required static stability to absorb the forces of the drive member when operating the ratchet tool.

A further advantageous variant is that the ratcheting tool is designed as a ratchet wrench. This gives another application. Because it is not always a conventional ratchet desired, but also a ratchet wrench. Even with such tools, the problem arises that screws or rivets can solve. In this respect, this covers another application.

An advantageous embodiment of the ratchet tool according to the invention results from the fact that the fastening means and / or the housing cover are provided for closing under tension. The fasteners and / or the housing cover are either biased due to their material or can be biased with additional clamping means. The tension prevents the housing cover from becoming loose in any way. The housing cover receives a the corresponding tight fit on the housing without screws or the like.

A preferred variant of the ratchet tool according to the invention also results from the fact that the housing cover has an elastic mounting groove, which yields to the housing when mounting the housing cover. This mounting groove allows the edge of the housing cover can yield during mounting. Because of the mounting groove, the edge of the housing cover can be pressed in the direction of mounting groove, before it finally reaches the groove-shaped recess. As a result, the elasticity and stress of the inherently rigid housing cover is increased. This facilitates the installation of the housing cover considerably. The mounting groove can also be formed segment or section wise.

Further embodiments and advantages will become apparent from the subject of the dependent claims, as well as the drawings with the accompanying descriptions. One Embodiment is explained below with reference to the accompanying drawings.

Short description of the drawing

Fig. 1

shows in a perspective schematic diagram of a cup-shaped housing without housing cover of a ratchet tool according to the invention with lever arm.

Fig. 2

schematically shows a perspective longitudinal section of the ratchet tool according to Fig. 1 with two enlarged sections of the side wall of the housing.

Figure 3

schematically shows a longitudinal section of the ratchet tool according to Fig. 1 in a side view.

Fig. 4

shows in a perspective schematic diagram of a housing cover with Kliplippe for a ratcheting tool according to the invention in plan view.

Fig. 5

schematically shows a perspective section of the housing cover with Kliplippe according to Fig. 4 for a ratchet tool according to the invention.

Fig. 6

shows in perspective the housing cover with Kliplippe according to 4 and 5 for a ratcheting tool according to the invention from a bottom view.

Fig. 7

shows in a perspective schematic diagram of a housing cover with plastic edge for a ratcheting tool according to the invention in plan view.

Fig. 8

schematically shows a perspective section of the housing cover with plastic edge according to Fig. 7 for a ratchet tool according to the invention.

Fig. 9

shows in perspective the housing cover with Kliplippe according to FIGS. 7 and 8 for a ratcheting tool according to the invention from a bottom view.

Fig. 10

shows in perspective a part of a ratchet tool designed as a ratchet.

Fig. 11

shows in perspective a part of the ratchet tool designed as a ratchet according to Fig. 10 from the top.

Preferred embodiment

In Fig. 1 is denoted by 10 an inventive ratchet tool. The ratchet tool 10 comprises a cup-shaped housing 12 and a lever arm 14. The cup-shaped housing 12 is located at a front end 16 of the lever arm 14. The rear end 18 of the lever arm 14 is formed as a handle end. The cup-shaped housing 12 has a side wall 20 and a bottom 22. In this case, the bottom 22 has recesses 24 for receiving storage and / or controls. In the housing 12, a ratchet mechanism, not shown here, is provided. The housing 12 forms, with the ratchet mechanism, a tool head 26 of the ratcheting tool 10. The ratchet mechanism has a rotating member 50 (see FIG Fig. 10 ) for torque transmission. The rotary member is rotatably mounted in the housing 12 and is locked to a locking member in one direction of rotation. With a switching mechanism, the locked direction of rotation can be changed to transmit the torque. The rotary part is connected to a drive part 52 (see Fig. 10 ), which transmits the torque, for example, to a screw.

In the upper region of the side wall 20 is a groove-shaped recess 28. This groove-shaped recess 28 serves to receive a housing cover 30 (see FIGS. 4 to 9 ). In this region of the side wall 20, a shoulder 31 is also provided for the housing cover 30, on which the housing cover 30 rests when closed.

In FIG. 2 the ratchet tool 10 is shown in perspective in a longitudinal section. The FIG. 2 otherwise corresponds to the FIG. 1 , Corresponding components are therefore identified with the same designations. In this figure, regions 32 are additionally shown enlarged with the cross section of the groove-shaped recess 28. The groove-shaped recess 28 is designed such that it surrounds the edge of the housing cover 30. The housing cover 30 also rests on the shoulder 31 of the side wall 20. The housing cover 30 can not be released by itself in this case. The edge of the housing cover 30 is pressed into the groove-shaped recess 28 for mounting. The housing cover 30, as in the following FIGS. 4 to 9 is shown, consists wholly or partly of plastic. Due to the plastic, the housing cover 30 for mounting on a sufficient elasticity, so that it can be introduced into the groove-shaped recess 28. The groove-shaped recess 28 is divided into several sections 32. The groove-shaped recess 28 also has a slightly protruding Klipprand 34, which acts in cross-section as a kind of barb.

Fig. 3 schematically shows a longitudinal section of the ratcheting tool 10 according to Fig. 1 respectively. Fig. 2 in a side view. Corresponding components with the previous figures are therefore identified by the same designations. Here is also visible that the groove-shaped recess 28, the sections 32 is divided. The housing 12, as shown in the following figures, has the corresponding paragraphs 31 of the side wall 20, which are also divided into sections 33 (see also Fig. 2 ). Clip edge 34 of the housing cover 30 (see Fig. 4 to 9 ) can engage or clasp in the sections 32 for fixing.

Fig. 4 shows in a perspective schematic diagram of the housing cover 30 with Kliplippe 38 for the ratcheting tool 10 in a plan view. The Kliplippe 38 forms in the present embodiment, in part, the edge of the housing cover 30. In the housing cover 30, a circular opening 40 is also provided. Through this circular opening 40, the drive part 52 of the ratchet mechanism is guided in the assembled state of the ratcheting tool 10. The Klipplippe 38 is divided into sections 32. This Klipplippe 38 hooks in the groove-shaped Recess 28 with the Klipprand 34 of the side wall 20 of the housing of the ratchet mechanism 10th

Fig. 5 schematically shows a perspective section through the housing cover 30 with the Kliplippe 38 according to Fig. 4 for the inventive ratcheting tool 10. In this figure, the cross-sectional shape of the Kliplippe 38 can be seen. The cross section is arcuate and has the function of a barb, which hooks into the groove-shaped recess 28 with the clip edge 34.

In Fig. 6 is the sake of completeness, the housing cover 30 with Kliplippe 38 according to 4 and 5 shown in perspective from a bottom view. If components correspond to previous figures and identical reference numerals are used. The Kliplippe 38 is arcuate in cross-section and opened in this view upwards. The Kliplippe 38 is preferably made of plastic. Other comparable materials that are elastic and flexible enough are also conceivable. It is important, however, that the Kliplippe 38 despite the flexibility has sufficient strength and stability.

Fig. 7 shows in a perspective schematic diagram of a housing cover 30 with a plastic edge 42 for the ratchet tool 10 according to the invention in plan view. In order to be able to mount the housing cover 30 better on the housing 12 of the ratcheting tool 10, a plastic groove 44 is provided in the region of the plastic edge 42. As a result, the plastic rim 42 has sufficient space so that it can yield easily during installation. The plastic edge 42 presses namely during assembly into the housing 12 only in the plastic groove 44 before it then engages in the groove-shaped recess 28. The plastic groove 44 yields during assembly of the housing 12. Through the circular opening 40, the drive part of the ratchet mechanism is guided in the mounted state.

Fig. 8 schematically shows a perspective section of the housing cover 30 with plastic edge 42 according to Fig. 7 for the ratcheting tool 10. As far as components correspond to previous figures and identical reference numerals are used. The plastic edge 42 has in this housing cover 30 in cross section a nose-shaped projection 46. This nose-shaped projection 46 engages in the groove-shaped recess 28 of the housing 12th

In Fig. 9 is perspective view of the housing cover 30 with the nose-shaped projection 46 according to FIGS. 7 and 8 for a ratcheting tool 10 according to the invention from a bottom view. Therefore, corresponding components will be identified by the same reference numerals. In this figure, it is also clear that the nose-shaped projection 46 of the edge 36 is divided into sections 33. Instead of the nose-shaped projection 46 or Klipplippe 38 of the rim 36, other shapes are conceivable, such as tabs, which engage in the groove-shaped recesses for attachment.

In Fig. 10 is shown in perspective part of a ratchet tool 10 designed as a ratchet. Approaching the lever arm 14 can be seen, on which the tool head 26 is arranged. The ratchet tool 10 has the ratchet mechanism disposed in the cup-shaped housing 12. The housing 12 is closed with the housing cover 30. A locking ring 54 holds the housing cover 30 fixed to the drive part 52. The drive part 52 has for this purpose a groove-shaped recess 56. The securing ring 54 is arranged in a recess 58 of the housing cover 30. A corresponding locking ring 54 is provided on the upper side of the housing 12, on the drive part 52 for locking (see also Fig. 11 ). Advantageously, Spirolox® rings are used as circlips. The driving part 52 is passed through the circular opening 40 in the housing cover 30. The drive part 52 is designed as an external square profile, so that corresponding Aufsteckwerkzeuge can be attached with inner square profile.

In Fig. 11 is in perspective a part of a trained as a ratchet ratchet tool 10 accordingly Fig. 10 but shown from the top. Approaching the lever arm 14 can be seen here, on which the tool head 26 is arranged. The ratchet tool 10 has the ratchet mechanism disposed in the cup-shaped housing 12. With a shift lever 60, the clockwise or anti-clockwise rotation of the drive part 52 of the ratchet tool 10 can be depending on Set demand. The locking ring 54a with the opposite locking ring 54 on the outside of the housing cover 30, the housing cover 30 is attached to the drive member 52. The locking ring 54a counters the attachment. The drive part 52 has a groove-shaped recess 56a. The securing ring 54a is arranged in a recess 58a of the upper side of the housing 12. The driving part 52 is passed through the circular opening 40 in the housing cover 30 through an opening 62 of the housing top. 10 ratchet tool 12 pot-shaped housing 14 lever arm 16 front end of the lever arm 18 rear end of the lever arm 20 Side wall 22 ground 24 Recesses in the ground 26 tool head 28 groove-shaped recess 30 housing cover 31 paragraph 32 Subsections of the groove-shaped recess 33 Partial sections of the border 34 Clip edge of the groove-shaped recess 38 Kliplippe 40 circular opening in the housing cover 42 Plastic edge of the housing cover 44 Plastic groove 46 nose-shaped projection 50 turned part 52 driving part 54, 54a circlip 56, 56a groove-shaped recess of the drive part 58, 58a deepening 60 gear lever 62 Opening at the top of the housing

Claims (11)

Ratcheting tool (10) comprising: a) a lever arm (16), b) a pot-shaped housing (12) having a bottom (22) and at least one side wall (20) which is provided on the lever arm (16), c) a ratchet mechanism disposed in the housing (12), d) a housing cover (30) covering the ratchet mechanism in the housing (12), e) a drive part (52) which is connected to the ratchet mechanism,
characterized in that f) the side wall (30) of the housing (12) and / or the drive part (52) have a groove-shaped recess (28, 56), in which fastening means (34, 38, 46, 54) for fixing the housing cover (30) are provided are. Ratchet tool (10) according to claim 1, characterized in that the housing cover (30) is wholly or partially made of plastic. Ratchet tool (10) according to any one of claims 1 or 2, characterized in that for closing a plastic edge (36) or a part of the plastic edge (33) of the housing cover (30) in the groove-shaped recess (28) of the side wall (20) of the housing (12) engages for attachment. Ratchet tool (10) according to one of claims 1 to 3, characterized in that the edge (36) of the housing cover (30) has a Kliplippe (38), which serves as fastening means in the groove-shaped recess (28) of the housing (12) for closing is clipped. Ratchet tool (10) according to one of claims 1 to 4, characterized in that the groove-shaped recess (28) of the side wall of the housing (12) for closing in the housing cover (30) clutches. Ratchet tool (10) according to one of claims 1 to 5, characterized in that the housing cover (30) has a plastic bottle which engages in inner recesses of the side wall (20) of the housing (12) for closing the housing (12). Ratchet tool (10) according to one of claims 1 to 6, characterized in that the fastening means are formed as two fastening elements which attach the housing cover (30) to the drive part (52) of the ratchet mechanism, wherein the drive part (52) through the housing cover (52). 30) and through the housing (12) is guided, a first fastening element (54) above the housing cover (30) and a second fastening element (54) outside the housing (12) is arranged. Ratchet tool (10) according to one of claims 1 to 7, characterized in that the ratcheting tool (10) is designed as a ratchet, wherein the drive part (52) through an opening (40) of the housing cover (30) is guided. Ratchet tool (10) according to one of claims 1 to 7, characterized in that the ratchet tool (10) is designed as a ratchet wrench. Ratchet tool (10) according to one of claims 1 to 9, characterized in that the fastening means (54) and / or the housing cover (30) are provided for closing under tension Ratchet tool (10) according to one of claims 1 to 10, characterized in that the housing cover (30) has an elastic mounting groove (44), which yields upon mounting of the housing cover (30) to the housing 12.

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