Screwdriver

Abstract

The invention relates to a screwing tool having a head (2) with a fixed jaw (4) and a movable jaw (3), which head is fixed on a handle (1) and can be pivoted about a pivot axis (20) from a small spacing position of the two jaws (3, 4) to a large spacing position of the two jaws (3, 4) against a restoring force. In order to enable such a screwing tool to be brought into contact with live parts, the handle has an insulating jacket (11) and a handling element (5) which is movable relative to the handle (1) and which, on movement, moves the head (2) from the small spacing position to the large spacing position.

Description

Technical Field

[0001] The present invention relates to a screwing tool having a head with fixed jaws and movable jaws, the head being fixed to a handle and capable of pivoting about a pivot axis against restoring force from a small-spaced position between the two jaws to a large-spaced position between the two jaws. Background Technology

[0002] Such a screwing tool is known, for example, from the document DE 10 2018 113478A1.

[0003] In this type of screwdriver, the elongated handle has a head that is pivotally hinged to the handle about a pivot axis, so that the distance between the gripping sidewalls of the two jaws changes as the head rotates. The head is connected to the handle via a transmission mechanism, causing the two gripping sidewalls to exert forces on each other with the torque applied to the handle, thus enabling the screwdriver to loosen or tighten hexagonal bolt heads or nuts with different wrench widths. The movable jaws are spring-loaded towards the fixed jaws via spring elements. The head is then spring-loaded to a first pivot position, corresponding to a small gap between the two jaws. To grip the nut or bolt head through the larger gap between the jaws, the head must move from the first pivot position to a second pivot position, where the two gripping sidewalls of the jaws move away from each other.

[0004] The so-called "adjustable wrench" is also known from existing technology. "In this context, the gripping sidewalls of the jaws can be moved to different interval positions by means of the operating elements.

[0005] Furthermore, the following screw-tightening tools are known from the prior art, which have a handle with an electrically insulating jacket, thereby enabling the screw-tightening tool to turn an electrified bolt or nut. Summary of the Invention

[0006] The technical problem to be solved by this invention is to improve the aforementioned type of screw-tightening tool for practical application. In particular, this invention aims to improve the aforementioned type of screw-tightening tool so that it can be used with live bolts or nuts.

[0007] The technical problem described herein is solved by the invention as provided in the claims. The dependent claims not only represent advantageous extensions of the invention as provided in the independent claims, but are also independent solutions to the technical problem.

[0008] The primary recommendation is to assemble a movable operating element on the handle, enabling the head to move from a small-interval position to a large-interval position. The operating element can be an operating slider movable relative to the handle. The handle can have a guide groove in which the operating slider is located. It can be specified that the operating element has a thrust shoulder acting on the thrust sidewall of the head. The head can have two arms. The two arms can give the head a forked shape. One arm consists of a movable jaw, and the other arm consists of a fixed jaw. The fixed jaw can be fitted with a jaw support, which is pivotally hinged to the handle. A pin-type shaft can thus engage with a support opening in the handle and / or the head or the jaw support. The jaw support can form a channel into which the end section of the handle extends. The channel can intersect with the pin. The moving section of the movable jaw can move relative to the jaw support. The moving section can thus have teeth into which the teeth of the handle can extend. The movable jaw support can be loaded by a spring element that causes the two jaws to act relative to each other. The operating element can be elongated and has a longitudinal side extending along the handle's extension direction, through which the operating element can translate. The longitudinal side of the operating element can have a handle groove or notch, on which the thumb of the hand gripping the handle can act, thereby enabling the operating element to translate by thumb operation. The operating element preferably acts on an arm of the head, which is spatially associated with the movable jaws. The handle can be an elongated flat piece having a first wide side and a second wide side pointing away from the first wide side. Narrow sides pointing away from each other extend between the two wide sides. The operating element is preferably associated with one of the two narrow sides. The narrow side can form a guide groove, or in a variation of the invention, one of the wide sides can also form a guide groove, in which the operating element, preferably an operating slider, is supported, and in which the operating element can move from a first position to a second position. The guide groove can be a laterally recessed groove into which a rib of the operating element, for example having a dovetail-shaped cross-section, is installed, pushed, or engaged, thereby allowing the operating element to be linearly movable into the handle. In a first position, which can be a return position, the end section of the operating element rests against the step of the guide groove. In a second position, which can be an operating position, the operating element moves the head from a first pivot position to a second pivot position, in which the distance between the two gripping sidewalls of the two jaws increases. Advantageously, the operating element has a thrust shoulder that engages with the thrust sidewall of the head. It can be specified that the thrust sidewall of the head is physically formed by fixed jaws, but spatially belongs to the side where the movable jaws of the head are located. If the operating element moves from the first position, the thrust shoulder can approach the thrust sidewall until it contacts it.Further movement of the operating element causes the head to pivot against the restoring force of the spring element. Preferably, this involves the same spring element that moves the two jaws toward each other. An embodiment of the invention is specified, wherein the handle includes a jacket. The handle particularly has an electrically insulating jacket, which may be formed by a plastic injection-molded encapsulation. This jacket allows the tool to be used with live parts. Advantageously, the operating element is electrically insulating or has an electrically insulating jacket. The operating element here extends primarily within the electrically insulatingly covered area of ​​the handle. The operating element may protrude beyond the electrically insulating jacket with its thrust shoulder toward the head. However, operation of the operating element is here achieved in the operating section, for example, at a thumb slot, which is arranged on the end of the operating element away from the thrust shoulder. The screwing tool according to the invention may have an operating slider, which has a thrust shoulder on its head-facing end and an operating section on its head-remote end.

[0009] Embodiments of the invention may have a protrusion. This may involve a protrusion extending around a handle, the protrusion being formed by an electrically insulating outer sheath. The protrusion is preferably adjacent to the head-facing end of the outer sheath. The protrusion may have a guide opening through which the operating element passes. Preferably, the operating element, placed in a guide groove, is slidably held on the handle through a window formed by the guide opening. Attached Figure Description

[0010] The embodiments of the present invention will now be described with reference to the accompanying drawings. In the drawings:

[0011] Figure 1 A top view of a wide side of an embodiment of the present invention is shown.

[0012] Figure 2 A top view of the narrow side of the embodiment is shown.

[0013] Figure 3 Shown in the first pivot position of head 2 relative to handle 1 along Figure 2 The sectional view obtained by sectioning line III-III shows that the two jaws 3 and 4 of the head 2 are in a small-interval position.

[0014] Figure 4 The following is shown in the second pivot position of the head relative to handle 1. Figure 3 The view shows that the two jaws 3 and 4 of the head 2 are in a wide-spaced position, and the operating element 5 acts on the thrust sidewall 7 of the head 2 through the thrust shoulder 6.

[0015] Figure 5 The diagram shows a cross-sectional view obtained by cutting along section line VV, and

[0016] Figure 6 A perspective view of an embodiment is shown. Detailed Implementation

[0017] The embodiment shown in the figure is a screw-tightening tool for tightening bolts with polygonal heads or nuts with polygonal profiles, wherein the distance A between the movable jaws 3 and the two gripping sidewalls 14, 15 of the fixed jaws 4 can vary, thereby enabling the screw-tightening of nuts or bolts with different wrench widths. The head 2 is rotatably hinged to the handle 1 around a universal joint pin, such that when torque is applied to the handle 1, the gripping sidewalls 14, 15 of the two jaws press against the polygonal surface of the nut or bolt with contact force.

[0018] Because of the electrically insulating outer jacket 11 and the operating element 5 which can translate along the outer jacket 11 and allows the head 2 with jaws 3 and 4 to rotate as the distance A changes, the opening width of the jaws formed by the two jaws 3 and 4 can be changed, while the metal head 2 comes into contact with the charged parts.

[0019] The handle 1 is constructed of a longitudinally elongated, flat metal body and has a hinged end, to which the head 2 is pivotally secured by a pin defining an axis. A bolt passes through both a support opening in the head 2 and a support opening in the hinged end of the handle. The head 2 may form a recess in which the hinged end forming the teeth 19 is located. Except for the end section engaging the recess in the head 2 or the hinged end, the handle 1 is completely surrounded by an electrically insulating jacket 11. This jacket can be applied to the metal substrate by injection molding. The jacket may be made of plastic. The jacket 11 forms a protrusion 12 that extends transversely to the direction of extension of the handle and protrudes near the hinged end. The handle serves as a hand protection device or mechanical resistance, preventing the hand gripping the handle 1 from slipping off the handle surface towards the head 2.

[0020] The head 2 forms a fixed jaw 4, which is hinged to the handle 1 by a pin forming the shaft 20. The fixed jaw 4 has a gripping sidewall 15 for acting on a polygonal surface of a nut or similar component. The movable jaw 3 has a moving section 17 that can translate along a direction extending generally transversely to the surface of the gripping sidewall 15. The moving section 17 forms the bottom 16 of the jaw, which is formed on one hand by the gripping sidewall 15 of the fixed jaw 4 and on the other hand by the gripping sidewall 14 of the movable jaw 3 opposite to the gripping sidewall 15.

[0021] The moving section 17 forms a toothed groove 18, into which the teeth 19 of the hinged end of the handle engage. When the handle 1 pivots relative to the head 2, the teeth 19 engaged in the toothed groove 18 cause the gripping sidewall 14 of the movable jaw 3 to move relative to the gripping sidewall 15 of the fixed jaw 4.

[0022] In this embodiment, the movable jaw 3 is loaded relative to the fixed jaw 4 by a spring element 8 formed by a compression spring, causing the gripping sidewalls 14 and 15 to approach each other. In the idle state, the distance A between the two gripping sidewalls 14 and 15 has a minimum value.

[0023] The guide groove 22 is located on one of the two narrow sides 10 of the handle 1. However, in an embodiment not shown, this guide groove 22 may also be arranged on the wide side 9. The guide groove 22 extends through the guide opening 13 that forms the window of the protrusion 12. The guide opening 13 holds the drive slider 5 in the guide groove 22.

[0024] Figure 5 The guide groove 22 is shown in cross-section. The guide groove may have a groove with a side-recessed wall. The rib of the operating element 5 can engage with this groove. The rib may have a dovetail-shaped cross-section. The rib can be installed in the groove, especially the side-recessed groove. The rib can also be pushed into or snapped into the groove, especially the side-recessed groove. This is so that the operating element 5 can only be linearly translated onto the handle. However, it may also be specified that the guide groove only forms a groove with a non-side-recessed bottom.

[0025] Figure 5 A metal core 26, encapsulated in plastic material, is also shown, which provides mechanical stability to the handle 1.

[0026] The operating slider 5 constitutes the operating element, and the head 2 is pivotable relative to the handle 1 so as to increase the distance A between the two gripping sidewalls 14, 15. This is achieved against the restoring force of the spring element 8. The head 2 thus constitutes a thrust sidewall 7, which is arranged on one side of the head 2 with the movable jaws 3. The operating element 5 has a thrust shoulder 6, which abuts against the thrust sidewall 7 when the operating element 5 moves, so as to pivot the head 2 thereon.

[0027] The operating element 5 forms a section that extends on the side of the protrusion 12 facing the head 2 and forms a thrust shoulder 6. Another section of the operating element 5 extends on the opposite side of the protrusion 12. This section forms an operating section 25, for example, in the form of a thumb groove or groove, so that the thumb of the hand gripping the handle 1 can move the operating element 5 by acting on the operating section 25. In this embodiment, the operating section 25 is arranged on the end of the operating element 5 opposite to the thrust shoulder 6. The end opposite to the thrust shoulder 6 forms an end section 23, which can abut against the step 24 of the guide groove 22 when the operating element 5 is in the initial position. In this embodiment, the operating section 25 is formed by the step or recess of the operating element 5.

[0028] exist Figure 3 In the initial position shown, distance A has a minimum value, and in this initial position, head 2 turns towards operating element 5. Figure 4 In the position shown, head 2 is away from operating element 5, and in this position, head 2 is in its maximum pivoting position relative to handle 1 compared to the initial position. When head 2 moves from... Figure 3 Move to the position shown Figure 4 In the position shown, the thrust shoulder 6 slides along the thrust sidewall 7. Figure 4 The corner region of the thrust shoulder 6 supporting the thrust sidewall 7 in the pivot end position is shown.

[0029] The elongated operating element 5 can be made of plastic or a metal part covered by plastic. The operating element is especially electrically insulated.

[0030] The working principle of a screwdriver is as follows:

[0031] exist Figure 3 In the initial position shown, the distance A between the movable jaw 3 and the fixed jaw 4 is at its minimum, and the head 2 is tilted towards the operating element 5. Starting from this initial position, the head 2 can be pivoted, for example, by moving the operating element 5 towards the head 2. Figure 4 In the position shown, the distance A between the movable jaw 3 and the fixed jaw 4 has a larger value. With the aid of the electrically insulated operating element 5, the opening width of the jaws formed by the gripping sidewalls 14 and 15 can also be increased when the metal head 2 comes into contact with a live component.

[0032] The above embodiments are used to illustrate the invention as a whole included in the application, which independently extends the prior art by at least the following combinations of features, wherein two, more, or all of these combinations of features can also be combined, namely:

[0033] A screwdriver is characterized by having an operating element 5 that is movable relative to the handle 1, such that when the operating element is moved, the head 2 moves from a small interval position to a large interval position.

[0034] A screwdriver, characterized in that the operating element 5 is an operating slider movable relative to the handle 1.

[0035] A screwing tool, characterized in that the operating element 5 has a thrust shoulder 6 acting on the thrust sidewall 7 of the head 2.

[0036] A screwdriver, characterized in that the operating element 5 has an elongated shape and a longitudinal side 21 extending along the handle extension direction, and the operating element forms the thrust shoulder 6 through its end side.

[0037] A screwdriver, characterized in that the head 2 has a first arm spatially associated with the movable jaw 3 and a second arm spatially associated with the fixed jaw 4, and the operating element 5 acts on the first arm.

[0038] A screwing tool, characterized in that the handle 1 has two wide sides 9 facing away from each other and two narrow sides 10 facing away from each other, wherein the operating element 5 is arranged on one of the narrow sides 10.

[0039] A screwdriver, characterized in that the handle 1 has a jacket 11 made of an electrically insulating material, and the operating element 5 is made of or covered by an electrically insulating material.

[0040] A screwdriver is characterized by having a protrusion 12 extending transversely from the handle 1 in the direction of handle extension, the protrusion having a guide opening 13 in which an operating element 5 is movably guided, and / or, the operating element 5 is linearly movable and held on the outer sleeve 11 of the handle.

[0041] A screwdriver is characterized in that a spring element 8 arranged in the head 2 loads the fixed jaws 4 toward the movable jaws 3, and the spring element applies force to place the head 2 in a first pivot position corresponding to a small interval position of the two jaws 3, 4, and / or, the operating element 5 is located in a guide groove 22, the guide groove forming a step 24, and the end section 23 of the operating element 5 opposite to the thrust shoulder 6 can abut against the step.

[0042] All disclosed features (in themselves and in combination thereof) have inventive significance or value. The disclosures of the subordinate / attached priority texts (previous applications) are also fully included in the publication of this application, and features from those priority texts are incorporated into the claims of this application. Features of dependent claims, even those without corresponding technical features, are improvements to the prior art that have independent inventive significance or value, and divisional applications can be filed based on these dependent claims. The invention provided in each claim may additionally include one or more technical features provided in the foregoing description, particularly those indicated by reference numerals and / or in the list of reference numerals. This invention also relates to design forms where certain technical features mentioned in the foregoing description cannot be implemented, particularly those that are unnecessary for the various applications or can be replaced by other technically equivalent devices.

[0043] List of reference numerals

[0044] 1. Handle

[0045] 2. Head

[0046] 3. Movable jaws

[0047] 4. Fixed jaws

[0048] 5. Operating elements and operating sliders

[0049] 6. Thrust shoulder

[0050] 7. Thrust sidewall

[0051] 8. Spring elements

[0052] 9. Wide side

[0053] 10 Narrow side

[0054] 11 Electrically insulating outer jacket

[0055] 12 Protrusions

[0056] 13. Guiding opening

[0057] 14. Grasp the sidewall

[0058] 15. Grasp the sidewall

[0059] 16 Bottom

[0060] 17 Moving segment

[0061] 18 tooth grooves

[0062] 19. Teeth

[0063] 20-axis

[0064] 21. Longitudinal side, handle face

[0065] 22 Guide Grooves

[0066] 23 End Section

[0067] 24 steps

[0068] 25. Operating section, thumb groove

[0069] 26 cores

[0070] A distance

Claims

1. A screwing tool having a head (2) with a fixed jaw (4) and a movable jaw (3), which head is fixed on a handle (1) and can be pivoted about a pivot axis (20) from a small spacing position of the two jaws (3, 4) to a large spacing position of the two jaws (3, 4) against a restoring force by movement of an operating element (5), which operating element is movably supported on the handle (1) in a guide groove (22), characterized in that The handle (1) has a jacket (11) made of an electrically insulating material, and the operating element (5) is made of or covered by an electrically insulating material. The jacket (11) forms a protrusion (12) extending around the handle (1), the protrusion (12) having a guide opening (13) forming a window through which the operating element (5) passes. The operating element (5) is movably guided in the guide opening (13) of the protrusion (12) extending from the handle (1) transverse to the extension direction of the handle. The handle (1) has a metal core (26) completely surrounded by the electrically insulating jacket (11) except for an end section that extends into a recess in the head (2). The protrusion (12) is an integral part of the electrically insulating jacket (11) and is configured as a hand protection device to prevent the hand gripping the handle (1) from pointing towards the head (2). The operating element (5) slides out in the direction of the handle (1), wherein the operating element (5) has an elongated shape and is arranged along the extension direction of the handle (1) on the area of ​​the handle (1) covered by the electrically insulating outer jacket (11), wherein the head-side section of the operating element (5) forms a thrust shoulder (6), the thrust shoulder is arranged on the side of the protrusion (12) facing the head (2) and protrudes beyond the electrically insulating outer jacket (11) towards the head (2), and wherein the operating element (5) has an operating section (25) away from the head (2), the operating section having a thumb groove or groove, the operating section being arranged on the side of the protrusion (12) away from the head (2), such that the operation of the operating element (5) is performed at the operating section (25), and the hand gripping the handle (1) only contacts the electrically insulating outer jacket (11) and the area of ​​the operating element (5) that is made of or covered by the electrically insulating material.

2. The screwing tool according to claim 1, characterized in that The operating element (5) is an operating slider that is movable relative to the handle (1).

3. The screwing tool according to claim 1, characterized in that The operating element (5) has an elongated shape and a longitudinal side (21) extending along the handle extension direction, and the operating element forms the thrust shoulder (6) through the end side.

4. The screwing tool according to claim 1, characterized in that The head (2) has a first arm spatially associated with the movable jaws (3) and a second arm spatially associated with the fixed jaws (4), and the operating element (5) acts on the first arm.

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

6. The screwing tool according to claim 1, characterized in that The operating element (5) is linearly movable and held on the outer sleeve (11) of the handle.

7. The screwing tool according to claim 1, characterized in that A spring element (8) arranged in the head (2) loads the fixed jaw (4) toward the movable jaw (3), and the spring element applies force to place the head (2) in a first pivot position corresponding to the small interval position of the two jaws (3, 4).

8. The screwing tool according to claim 1, characterized in that The operating element (5) is located in the guide groove (22), which forms a step (24), and the end section (23) of the operating element (5) opposite to the thrust shoulder (6) can abut against the step.

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