SCREWDRIVER TOOL

Description

field of technology

[0001] The invention relates to a screwing tool with a head having a fixed jaw and a movable jaw, which is attached to a handle so as to be pivotable about a pivot axis from a small distance between the two jaws to a large distance between the two jaws, against a restoring force. State of the art

[0002] Such a screwing tool is known, for example, from DE 10 2018 113 478 A1.

[0003] In a screwdriving tool of this type, an elongated handle carries a head that is pivotally mounted on the handle about a pivot axis in such a way that the distance between the grip flanks of the two jaws changes as the head pivots. The head is connected to the handle via a gear in such a way that the two grip flanks are forced towards each other as a torque is applied to the handle, allowing the screwdriving tool to loosen or tighten hexagon screw heads or nuts with different wrench sizes. The movable jaw is spring-loaded towards the fixed jaw by a spring element. At the same time, the spring element forces the head into a first pivot position, which corresponds to the small distance between the two jaws.In order to grip a nut or a screw head with a greater distance between the two jaws, the head must be moved from the first pivoting position to a second pivoting position in which the two gripping flanks of the jaws are separated from each other.

[0004] Also known from the state of the art are so-called "English" grips, in which the gripping flanks of the jaws can be moved into a different distance position by means of an actuating element.

[0005] Furthermore, screwing tools are known from the prior art which have a handle with an electrically insulating covering so that live screws or nuts can be turned with the screwing tool.

[0006] WO 97 / 36717 A1 discloses a screwing tool according to the preamble of claim 1. Summary of the invention

[0007] The invention is based on the object of further developing the generic screwing tool in a manner that is advantageous for use. One object of the invention is, in particular, to further develop a generic screwing tool in such a way that it can be used on live screws or nuts.

[0008] The problem is solved by the invention specified in the claims.

[0009] First and foremost, it is proposed that a movable actuating element be arranged on the handle, with which the head can be displaced from the small distance position to the large distance position. The actuating element can be an actuating slide that can be displaced relative to the handle. The handle can have a guide recess in which the actuating slide rests. The actuating element can have a shoulder that engages an abutting flank of the head. The head can have two legs. The two legs can give the head a forked shape. One of the two legs is formed by the movable jaw and the other leg by the fixed jaw. The fixed jaw can be assigned to a jaw carrier that is pivotally connected to the handle. For this purpose, an axis in the form of a bolt can engage in bearing openings in the handle and / or the head or the jaw carrier.The jaw carrier can form a shaft into which an end section of the handle projects. The shaft can be crossed by the bolt. A sliding section of the movable jaw can be displaceable relative to the jaw carrier. For this purpose, the sliding section can have a tooth gap into which a tooth of the handle projects. The movable jaw carrier can be acted upon by a spring element that urges the two jaws towards one another. The actuating element can have an elongated shape and a long side running in a handle extension direction, with which the actuating element can be displaced. The long side of the actuating element can have gripping recesses or a knurling that the thumb of a hand grasping the handle can engage, so that the actuating element can be displaced by thumb actuation.The actuating element preferably engages the leg of the head that is spatially associated with the movable jaw. The handle can be an elongated flat piece having a first broad side and a second broad side facing away from it. Narrow sides facing away from each other extend between the two broad sides. The actuating element is preferably associated with one of the two narrow sides. The narrow side or, in a variant of the invention, also one of the broad sides can form the guide recess in which the actuating element, which is preferably an actuating slide, lies and in which it can be displaced from a first position to a second position.The guide recess can be an undercut groove into which a rib of the actuating element, for example having a dovetail-shaped cross-section, is mounted, inserted, or clipped, so that the actuating element is bound to the handle in a linearly movable manner. In the first position, which can be a retracted position, an end section of the actuating element rests on a step of the guide recess. In a second position, which can be an actuating position, the actuating element has displaced the head from a first pivot position to a second pivot position, in which the two gripping flanks of the two jaws have an increased distance. It is advantageous if the actuating element has a butt shoulder that interacts with a butt flank of the head.It can be provided that the impact flank of the head is physically formed by the fixed jaw, but is spatially assigned to the side of the head on which the movable jaw is located. If the actuating element is displaced from a first position, the impact shoulder can approach the impact flank until it touches the impact flank. Further displacement of the actuating element then leads to a pivoting of the head against the restoring force of a spring element. This is preferably the same spring element that displaces the two jaws towards each other. Embodiments of the invention are provided in which the handle has a casing. The handle has, in particular, an electrically insulating casing, which can be formed from a plastic overmolding. As a result of this casing, the tool can be used on live parts.According to the invention, the actuating element is electrically insulating or has an electrically insulating sheath. The actuating element extends largely over the electrically insulating sheathed area of the handle. Its impact shoulder can protrude beyond the electrically insulating sheath in the direction of the head. However, the actuating element is actuated via an actuating section, for example a thumb recess, which is arranged at the end of the actuating element facing away from the impact shoulder. The screwing tool according to the invention can have an actuating slide which has an impact shoulder at its end facing the head and an actuating section at its end facing away from the head.

[0010] A tool according to the invention has a collar extending from the handle transversely to the direction of handle extension. This collar can be a collar extending around the handle and formed by an electrically insulating sheath. This collar is preferably adjacent to the end of the sheath facing the head. The collar has a guide opening through which the actuating element protrudes. The actuating element, located in a guide recess, is slidably fixed to the handle by the window formed by the guide opening. Short description of the drawings

[0011] Embodiments of the invention are explained below with reference to the accompanying drawings. They show: Fig. 1 is a plan view of a broad side of an embodiment of the invention, Fig. 2 is a plan view of a narrow side of the embodiment, Fig. 3 is a section along the line III-III in Figure 2in a first pivoting position of a head 2 relative to a handle 1, wherein two jaws 3, 4 of the head 2 assume a small distance position, Fig. 4 a representation according to Figure 3 in a second pivoting position of the head relative to the handle 1, in which the two jaws 3, 4 of the head 2 assume a large distance and an actuating element 5 with a butt shoulder 6 engages a butt flank 7 of the head 2, Fig. 5 a section along the line VV and Fig. 6 a perspective view of the embodiment. Description of the embodiments

[0012] The embodiment shown in the drawings is a screwing tool for turning screws with a polygonal head or nuts with a polygonal profile, wherein the distance A between two grip flanks 14, 15 of a movable jaw 3 relative to a fixed jaw 4 is variable in such a way that nuts or screws with different wrench widths can be turned with the screwing tool, wherein a head 2 is pivotally connected to a handle 1 about a pivot pin 20 in such a way that when a torque is applied to the handle 1, grip flanks 13, 14 of the two jaws are each pressed against the polygonal surfaces of the nut or screw with a contact force.

[0013] Due to an electrically insulating casing 11 and an actuating element 5 which can be displaced along the casing 11 and with which the head 2 carrying the jaws 3, 4 can be pivoted along with a change in the distance A, the width of the opening of the mouth formed by the two jaws 3, 4 can be changed, while at the same time the metallic head 2 touches a live part.

[0014] The handle 1 consists of an elongated, flat metal body and has a pivot end to which the head 2 is pivotally attached by means of a bolt defining an axis 20. The bolt extends through bearing openings in both the head 2 and the pivot end of the handle. The head 2 can form a pocket in which the pivot end forming a tooth 19 lies. Except for the end section engaging in the pocket of the head 2 or the pivot end, the handle 1 is completely surrounded by an electrically insulating sheath 11. The sheath can be applied to the metal base body using an injection molding process. The sheath can be made of plastic. A collar 12 is formed by the sheath 11 and projects transversely to the direction of extension of the handle and close to the pivot end.The handle forms a hand guard or a mechanical resistance that prevents a hand holding the handle 1 from slipping over the handle surface in the direction of the head 2.

[0015] The head 2 forms a fixed jaw 4, which is articulated to the handle 1 by means of the bolt 20 forming the axis 20. The fixed jaw 4 has a gripping flank 15 for engaging a polygonal surface of a nut or the like. A sliding section 17 of a movable jaw 3 is displaceable in a direction approximately transverse to the surface extension of the gripping flank 15. The sliding section 17 forms the base 16 of a mouth formed, on the one hand, by the gripping flank 15 of the fixed jaw 4 and, on the other hand, by a gripping flank 14 of the movable jaw 3 opposite this.

[0016] The sliding section 17 forms a tooth gap 18 into which a tooth 19 of the pivoting end of the handle engages. If the handle 1 is pivoted relative to the head 2, the tooth 19 engaging in the tooth gap 18 displaces the grip flank 14 of the movable jaw 3 relative to the grip flank 15 of the fixed jaw 4.

[0017] A spring element 8, formed in the exemplary embodiment by a compression spring, acts on the movable jaw 3 relative to the fixed jaw 4 in such a way that the gripping flanks 14, 15 tend to approach each other. In the resting state, the distance A between the two gripping flanks 14, 15 has a minimal value.

[0018] A guide recess 22 is located on one of the two narrow sides 10 of the handle 1. In embodiments not shown, such a guide recess 22 can also be arranged on a broad side 9. The guide recess 22 extends through a guide opening 13 of the collar 12, which forms a window. The guide opening 13 holds an actuating slide 5 in the guide recess 22.

[0019] The Figure 5shows the guide recess 22 in cross-section. The guide recess can have a groove with undercut walls. A rib of the actuating element 5 can engage in this groove. The rib can have a dovetail-shaped cross-section. The rib can be mounted in the groove, in particular the undercut groove. It can also be pushed or clipped into the groove, in particular the undercut groove. This is done in order to attach the actuating element 5 to the handle in a merely linearly displaceable manner. However, it can also be provided that the guide recess merely forms a depression with a non-undercut base.

[0020] The Figure 5 also shows a metal core 26 overmolded with a plastic compound, which gives the handle 1 mechanical stability.

[0021] The actuating slide 5 forms an actuating element with which the head 2 can be pivoted relative to the handle 1, thereby increasing the distance A between the two handle flanks 14, 15. This occurs counter to the restoring force of the spring element 8. For this purpose, the head 2 forms a butt flank 7, which is arranged on the side of the head 2 on which the movable jaw 3 is also located. The actuating element 5 has a butt shoulder 6, which, when the actuating element 5 is displaced, pushes against the butt flank 7 in order to pivot the head 2.

[0022] The actuating element 5 forms a section that extends on the side of the collar 12 facing the head 2 and forms the impact shoulder 6. Another section of the actuating element 5 extends on the opposite side of the collar 12. This section forms an actuating section 25, for example in the form of a thumb recess or a ribbing, so that the thumb of a hand grasping the handle 1 can displace the actuating element 5 by engaging the actuating section 25. In the exemplary embodiment, the actuating section 25 is arranged at the end of the actuating element 5 opposite the impact shoulder 6. The end opposite the impact shoulder 6 forms an end section 23, which, in a basic position of the actuating element 5, can bear against a step 24 of the guide recess 22. In the exemplary embodiment, the actuating section 25 is formed by a step or indentation of the actuating element 5.

[0023] In the Figure 3 In the basic position shown, in which the distance A is at its minimum, the head 2 is guided towards the actuating element 5. In the position shown in Figure 4 In the position shown, in which the head 2 assumes a maximum pivoting position relative to the handle 1 compared to the basic position, the head 2 is facing away from the actuating element 5. During the displacement of the head 2 from the position shown in the Figure 3 shown position in the Figure 4 In the position shown, the impact shoulder 6 slides along the impact flank 7. The Figure 4 shows that the butt shoulder 6 supports a corner area of the butt flank 7 in the pivoting end position.

[0024] The elongated actuating element 5 can be made of plastic or a metal part coated with plastic. It is, in particular, electrically insulating.

[0025] The operation of the screwing tool is as follows: Starting from a Figure 3 In the basic position shown, in which the distance A between the movable jaw 3 and the fixed jaw 4 has a minimum value and the head 2 is inclined towards the actuating element 5, the head 2 can be moved into a position such as that shown, for example, by displacing the actuating element 5 in the direction of the head 2. Figure 4 shows, can be pivoted. In this pivoted position, the distance A between the movable jaw 3 and the fixed jaw 4 has a greater value. With the aid of the electrically insulating actuating element 5, the opening width of the mouth formed by the handle flanks 14, 15 can be increased even when the metal head 2 is in contact with a live part.

[0026] The above statements serve to explain the inventions covered by the application as a whole, which also independently develop the state of the art at least by the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0027] A screwing tool characterized by an actuating element 5 which is displaceable relative to the handle 1 and which, when displaced, moves the head 2 from the small distance position to the large distance position.

[0028] A screwing tool characterized in that the actuating element 5 is an actuating slide that can be moved relative to the handle 1.

[0029] A screwing tool, which is characterized in that the actuating element 5 has a shoulder 6 engaging an abutment flank 7 of the head 2.

[0030] A screwing tool, which is characterized in that the actuating element 5 has an elongated shape and a longitudinal side 21 extending in a handle extension direction and forms the impact shoulder 6 with an end face.

[0031] A screwing tool, characterized in that the head 2 has a first leg spatially associated with the movable jaw 3 and a second leg spatially associated with the fixed jaw 4, and the actuating element 5 engages the first leg.

[0032] A screwing tool, which is characterized in that the handle 1 has two broad sides 9 facing away from each other and two narrow sides 10 facing away from each other, wherein the actuating element 5 is arranged on one of the narrow sides 10.

[0033] A screwing tool, characterized in that the handle 1 has a casing 11 made of an electrically insulating material, and the actuating element 5 consists of an electrically insulating material or is covered by such a material.

[0034] A screwing tool which is characterized by a collar 12 which projects transversely to the handle extension direction from the handle 1 and which has a guide opening 13 in which the actuating element 5 is displaceably guided and / or that the actuating element 5 is bound to a casing 11 of the handle in a linearly movable manner.

[0035] A screwing tool, which is characterized in that a spring element 8 arranged in the head 2 acts on the fixed jaw 4 against the movable jaw 3 and acts on the head 2 in a first pivoting position corresponding to the small distance between the two jaws 3, 4, and / or in that the actuating element 5 lies in a guide recess 22 which forms a step 24 against which an end section 23 of the actuating element 5 opposite the impact shoulder 6 can rest.

[0036] All disclosed features are essential to the invention (individually, but also in combination with one another). The invention specified in each claim may additionally comprise one or more of the features specified in the above description, in particular those provided with reference numbers and / or in the list of reference numbers. The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular insofar as they are clearly dispensable for the respective intended use or can be replaced by other technically equivalent means, within the scope of the invention specified in the patent claims. List of reference symbols 1 Handle 25 Operating section, thumb recess 2 Head 3 movable jaw 26 core 4 firm cheek 5 Actuating element, actuating slide 6 Shoulder 7 Impact flank 8 spring element 9 broadside A Distance 10 narrow side 11 electrically insulating sheath 12 collar 13 Guide opening 14 Handle flank 15 Handle flank 16 Floor 17 Sliding section 18 Gap between teeth 19 Tooth 20 axis 21 Long side, grip surface 22 Guide recess 23 final section 24 Level

Claims

1. A screwing tool comprising a head (2), which has a fixed jaw (4) and a movable jaw (3) and which, by shifting an actuating element (5), which is mounted in a shiftable manner in a guide recess (22), is fastened to a handle (1) so as to be pivotable about a pivot axis (20) against a restoring force from a small distance position of the two jaws (3, 4) into a large distance position of the two jaws (3, 4), characterized in that the handle (1) has a casing (11), which is made of an electrically insulating material, and the actuating element (5) consists of an electrically insulating material or is encased by such and a collar (12), which protrudes from the handle (1) transversely to the handle extension direction, is guided in a shiftable manner in a guide opening (13).

2. The screwing tool according to claim 1, characterized in that the actuating element (5) is an actuating slide, which can be shifted with respect to the handle (1).

3. The screwing tool according to claim 1, characterized in that the actuating element (5) has an abutment shoulder (6), which engages with an abutment flank (7) of the head (2).

4. The screwing tool according to claim 1, characterized in that the actuating element (5) has an elongate shape and a longitudinal side (21) running in a handle extension direction and forms the abutment shoulder (6) with a front side.

5. The screwing tool according to claim 1, characterized in that the head (2) has a first leg, which is spatially assigned to the movable jaw (3), and a second leg, which is spatially assigned to the fixed jaw (4), and the actuating element (5) engages with the first leg.

6. The screwing tool according to claim 1, characterized in that the handle (1) has two broad sides (9) facing away from one another and two narrow sides (10) facing away from one another, wherein the actuating element (5) is arranged on one of the narrow sides (10).

7. The screwing tool according to claim 1, characterized in that the actuating element (5) is tied to casing (11) of the handle in a linearly movable manner.

8. The screwing tool according to claim 1, characterized in that a spring element (8) arranged in the head (2) biases the fixed jaw (4) against the movable jaw (3) and biases the head (2) into a first pivot position, which corresponds to the small distance position of the two jaws (3, 4).

9. The screwing tool according to claim 1, characterized in that the actuating element (5) lies in a guide recess (22), which forms a step (24), on which an end section (23) of the actuating element (5), which is located opposite the abutment shoulder (6), can abut.