SCREWDRIVER TOOL

Description

field of technology

[0001] The invention relates to a screwing tool according to claim 1, comprising an elongated handle that carries a head pivotable about a pivot axis at at least one of its two ends, each having two torque-transmitting flanks. The handle has a force-applying flank for applying a force to generate a torque on the head. The farther the force-applying flank is from the head, the greater the torque exerted on the head at a constant force. State of the art

[0002] A screwing tool of the type described above is known from DE 94 04 031 U1. At a first end of an elongated handle is a head having two torque-transmitting flanks. If the head is pivoted about a rotational axis relative to the handle, the distance between a fixed jaw firmly connected to the head and a movable jaw slidably arranged on the head changes. Each of the two jaws forms a torque-transmitting flank. The two torque-transmitting flanks approach each other when torque is applied to the head via the handle. To displace the movable jaw relative to the fixed jaw, a tooth arrangement on the end of the handle engages a rack arrangement on the movable jaw.

[0003] A similar screwing tool is described in DE 10 2017108 014 A1.

[0004] US 2,697,371 describes an open-end wrench with an elongated handle, which has a head with an opening at each of its ends and is firmly connected to the handle.

[0005] From US 2,751,802 a ring wrench is already known in which two ring-shaped screw head attack profile sections are each arranged at the end of an elongated handle.

[0006] WO 2010 / 002239 A1 also belongs to the prior art. A tool according to the preamble of claim 1 is disclosed in US Pat. No. 1,363,274 A. Summary of the invention

[0007] The invention is based on the object of further developing a screwing tool characterized at the outset in a manner that is advantageous in use.

[0008] The problem is solved by the invention specified in the claims, wherein the subclaims represent not only advantageous developments of the invention specified in the main claim, but also independent solutions to the problem.

[0009] First and foremost, a screwing tool according to claim 1 is proposed, in which a head pivotable about a pivot axis is arranged at each end of the handle. The handle forms two force-applying flanks onto which a force can be exerted in order to apply a torque to the head arranged remote from the force-applying flank. According to the invention, this force-applying flank is adjacent to a nearby head. A narrow side of the head closest to the respective force-applying flank forms an extension of the force-applying flank. Each of the two heads is supported in a pivoting end position with a stop on a counter-stop of the handle. In the pivoting end position, the heads thus each form quasi-rigid extensions of the force-applying flank, which is subjected to a force in order to apply a torque to the other head.The narrow side of the head thus forms a lever extension that is pivotably associated with the handle and preferably flush with the force application flank of the handle. In particular, it is provided that the handle has two opposing broad sides and two opposing narrow sides. The pivot axes with which the head is hinged to the handle run through the ends of the two broad sides. One of the two narrow sides forms the force application flank. Each of the two heads also forms two opposing broad sides. The broad sides of the two heads and of the handle preferably run in parallel planes. In the broad side plane, the head is arranged so that it can be pivoted relative to the handle. The head has a fixed jaw and a movable jaw that can be moved relative to the fixed jaw. The two jaws can form torque transmission flanks that face towards one another.The displacement of the movable jaw relative to the fixed jaw occurs in the broad side plane. A back of the fixed jaw forms a narrow side, which forms a support flank that adjoins the force-applying flank of the handle essentially without any kinks, thus forming a force arm extension. Each of the two heads has a stop that, in a first pivoting end position, rests against a counter-stop of the handle. According to the invention, a spring element is provided that holds the head in the first stop position. The spring element preferably acts on the movable jaw such that, in the first pivoting end position, the distance between the two torque-transmitting flanks is minimal.The two heads, each of which is pivotally connected to the handle at the end, preferably differ from one another in that the minimum distances between their torque transmission flanks in the first two pivot end positions are different. The two heads are designed so that they can each grip hexagon nuts or screw heads with three or four different wrench sizes. By differing the minimum distances between the torque transmission flanks of the two heads, the number of wrench sizes that can be screwed with the screwdriving tool can be doubled. The movable jaw is motion-coupled to one arm of the handle in such a way that the distance between the two torque transmission flanks or the distance between the movable jaw and the fixed jaw changes when the head is pivoted relative to the handle.The arm preferably engages a pressure flank of the movable jaw, which is formed by a recess into which a tooth formed by the arm of the handle engages. According to the invention, the two heads can be displaced in opposite pivoting directions from the first pivot end position to a second pivot end position, in which the distance between the two torque transmission flanks is minimal. For this purpose, one of the heads must be pivoted clockwise, for example, and the other of the two heads must be pivoted counterclockwise, for example. The displacement from the first pivot end position to the second pivot end position preferably occurs against the restoring force of a spring. In the second pivot end position, the two torque transmission flanks have the distance with which they can grip a hexagon profile with the largest wrench width.The maximum distance between the two torque transmission flanks of one head can be smaller than the minimum distance between the two torque transmission flanks of the other head. According to the invention, the second head of the screwing tool, which can be grasped by the user's hand, forms a handle that represents a force application point located at the maximum distance from the second head. For this purpose, it is particularly advantageous if the material thickness of the two jaws of the head is greater than the material thickness of the handle, and in particular, the narrow side of the head is wider than the force application flank formed by the narrow side of the handle. Short description of the drawings

[0010] An embodiment of the invention is explained below with reference to the accompanying drawings. They show: Fig. 1 shows the screwing tool in a broad side view, with the hand of a worker engaging a head 3, Fig. 2 shows the screwing tool in a narrow side view and Fig. 3 shows the screwing tool in section along the line III-III in Figure 2. Description of the embodiments

[0011] The screwdriving tool shown in the drawings has an elongated handle 1 made of steel. The handle 1 has a first end 1' and a second end 1" opposite thereto. At the first end 1' there is a first head 2 which can be pivoted about a pivot axis 4 relative to the handle 1. The head 2 has a fixed jaw 13 and a movable jaw 14 which can be moved relative to the fixed jaw 13. The fixed jaw 13 forms a torque transmission flank 15 directed towards the movable jaw 14 and the movable jaw 14 forms a torque transmission flank 16 opposite the torque transmission flank 15.

[0012] The movable jaw 14 forms a pressure flank 18 with a tooth gap, which is engaged by a tooth-like arm 17 of the first end 1' of the handle 1. A spring 12 applies force to the movable jaw 14 against the fixed jaw 13. The spring 12 holds the head 2 in a first pivoting end position, in which a stop 8 of the head 2 rests against a counter-stop 9 of the handle. In this pivoting end position, the distance S1 between the two torque transmission flanks 15, 16 is minimal.

[0013] At the second end 1" of the handle 1, a second head 3 is attached, which can be pivoted about a pivot axis 5 relative to the handle 1. The second head 3 has a fixed jaw 13 and a movable jaw 14 that can be displaced relative to the fixed jaw 13. Here, too, the two jaws 13, 14 form torque transmission flanks 15, 16 directed towards one another, which, in a pivoting end position of the head 3 relative to the handle 1, have a minimum distance S2 that is less than the distance S1, so that with the first head 2, hexagon profiles of a different wrench size than with the head 3 can be accommodated between the torque transmission flanks 15, 16 in order to apply a torque to screws or nuts.

[0014] The movable jaw 14 of the second head 3 is acted upon by the spring 12, so that a stop 8 of the head 3 rests against a counter-stop 9 of the handle 1. Here, too, a movement coupling between the handle 1 and the movable jaw 14 is provided, in which an arm 17 engages a pressure flank 18 of the head 3.

[0015] If the head 2 is pivoted clockwise about the pivot axis 4, the distance S1 between the two torque transmission flanks 15, 16 increases. If the head 3 is pivoted counterclockwise about the pivot axis 5, the distance S1 between the two torque transmission flanks 15, 16 increases.

[0016] The narrow sides of the handle 1 each form force application flanks 6, 7 adjacent to one of the two heads 2, 3. In the exemplary embodiment, the force application flanks 6, 7 are slightly concave. If a force is exerted on the respective force application flanks 6, 7, a torque can be exerted on the head 2, 3 that is located away from the respective force application flank 6, 7. The head 2, 3, which is close to the force application flank 6, 7 and immediately adjacent to it, forms an extension of the force application flank 6, 7 with its narrow side 11. The extended force application flank 6, 7 thus forms a support flank formed by the narrow side 10, 11, which adjoins the force application flank 6, 7 formed by the handle 1 flush, i.e., without kinks. The narrow sides 10, 11 forming the support flank form convex extensions of the force application flanks 6, 7.The concave contour line of the force application flank 6, 7 merges smoothly into the convexly curved narrow side 10, 11 of the head 2, 3 in the transition area to the head 2, 3, forming a turning point.

[0017] Again Figure 2 As can be seen, the two narrow sides 10, 11 adjoin the force application flanks 6, 7 with approximately the same narrow side width, so that an enlarged pressure surface is formed, which can be acted upon by the ball of the user's hand when the screwing tool is operated. When applying torque, the user can hold one of the two heads 2, 3 in the hollow of their hand, with the ball of their hand resting on the narrow side 10, 11. The crease between the index finger and thumb can lie in the convex force application flank 6, 7.

[0018] It is particularly advantageous if the transition area between the extended force application flanks 6, 7 formed by the head 2, 3 transitions essentially in a straight line into the force application flanks 6, 7 formed by the handle. In the transition area, the two surface sections of the adjacent force application flanks 6, 7 of the handle 1 and the head 2, 3 lie flush with one another. In the transition area between the side surface of the handle 1 and the side surface of the head 2, 3, no kink or step forms on the side of the force application flank 6, 7.

[0019] The above statements serve to explain the inventions covered by the application as a whole, which each independently develop the state of the art by at least the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0020] A screwdriving tool with an elongated handle 1, which carries at each of its two ends 1', 1" a head 2, 3 which can be pivoted about a pivot axis 4, 5 and each has two torque transmission flanks 15, 16 and a force application flank 6, 7 for introducing a force to generate a torque on the head 2, 3 remote from the respective force application flank 6, 7, wherein in a pivot end position of the head 2, 3, in which a stop 8 of the head 2, 3 rests against a counter-stop 9 of the handle 1, a narrow side 10, 11 of the head 2, 3 functionally directed away from the stop 8 forms an extension of the force application flank 6, 7.

[0021] A screwing tool which is characterized in that the narrow side 10, 11 is substantially flush with the force application flank 6, 7.

[0022] A screwing tool characterized in that the head 2, 3 is held in the pivoting end position by means of a spring 12.

[0023] A screwing tool characterized in that the two force application flanks 6, 7 are formed by the same narrow side of the handle 1.

[0024] A screwing tool characterized by a fixed jaw 13 arranged on the head 2, 3 and a movable jaw 14 which is displaced relative to the fixed jaw 13 when the head 2, 3 is pivoted.

[0025] A screwing tool characterized in that the distance between a first torque transmission flank formed by the fixed jaw 13 and a second torque transmission flank 16 formed by the movable jaw 14 is minimal in the pivoting end position.

[0026] A screwing tool characterized in that the two heads 2, 3 have different minimum distances between the two torque transmission flanks 15, 16.

[0027] A screwing tool which is characterized in that the two heads 2, 3 are to be displaced from the respective pivoting end position in opposite pivoting directions. List of reference symbols

[0028] 1 Handle S1 Distance 1' End S2 Distance 1" End 2 Head 3 Head 4 Swivel axis 5 Swivel axis 6 Force application flank 7 Force application flank 8 stop 9 Counter-attack 10 narrow side 11 narrow side 12 Feather 13 firm cheek 14 movable jaw 15 Torque transmission flank 16 Torque transmission flank 17 arm 18 pressure flank

Claims

1. A screwing tool with an elongate handle (1), which on each of its two ends (1', 1") carries a head (2, 3) that is pivotable about a pivot axis (4, 5) and respectively forms torque transmission flanks (15), the distance between which changes during a pivoting motion of the head (2, 3), with a fixed jaw (13) and a movable jaw (14), wherein said handle has a force application flank (6, 7) for introducing a force in order to generate a torque on the head (2, 3) lying remotely from the respective force application flank (6, 7), wherein a narrow side (10, 11) of the fixed jaw (13), which is functionally directed away from a stop (8), forms an extension of the force application flank (6, 7) in a pivoting end position of the head (2, 3), in which the stop (8) of the head (2, 3) lies against a counter stop (9) of the handle (1), which essentially lies flushly adjacent to the force application flank (6, 7), which forms a pressure surface on which the palm of a hand gripping the head (2, 3) can rest, characterized in that the head (2, 3) is held in the pivoting end position by means of a spring (12), in that the counter stop (9) is associated with the handle (1), and in that the two heads (2, 3) are to be displaced from the respective pivoting end position in opposite pivoting directions.

2. The screwing tool according to one of the preceding claims, characterized in that the two force application flanks (6, 7) are formed by the same narrow side of the handle (1).

3. The screwing tool according to one of the preceding claims, characterized by a fixed jaw (13) that is rigidly arranged on the head (2, 3) and a movable jaw (14) that is displaced relative to the fixed jaw (13) during a pivoting motion of the head (2, 3).

4. The screwing tool according to one of the preceding claims, characterized in that the distance between a first torque transmission flank formed by the fixed jaw (13) and a second torque transmission flank (16) formed by the movable jaw (14) is minimal in the pivoting end position.

5. The screwing tool according to claim one of the preceding claims, characterized in that the two heads (2, 3) have different minimal distances between the two torque transmission flanks (15, 16).