Screwdriver with blade inserted in a sleeve

Abstract

The invention relates to a screwdriver (1) with a handle body (5) having a freewheel locking mechanism, to which a blade (4) is attached. A freely rotatable sleeve (3) is mounted on the blade (4). The sleeve (3) has at least one opening (4) which has an opening surface adapted to the fingertip of an index finger or thumb of a hand such that, by means of an effective area acting through the opening (4) on the blade surface of the fingertip, which is supported on an edge (15) of the opening (4) with a support area, no or only a slight frictional force can be exerted on the blade (2) by changing a radial force in a first force application position, in which the blade (2) can rotate freely or almost freely in the sleeve (3), and in a second force application position, an increased frictional force can be exerted on the blade (2), in which the handle body (5) can be rotated against the counter-rotational torque relative to the blade (2).

Description

field of technology

[0001] The invention relates to a screw tool with a handle body having a freewheel lock and attached to a blade with a smooth-walled blade surface, wherein the blade is freely rotatable in a sleeve, wherein a torque can be transmitted to the blade by turning the handle body in a locking direction of the freewheel lock and can be rotated by turning in a freewheel direction opposite to the locking direction by overcoming a back torque of the freewheel lock relative to the blade.

[0002] Such a screw-driving tool can be held by the sleeve with one hand. The other hand can freely rotate the handle body to, for example, drive a machine screw into a thread. However, with a loosely engaging thread, turning a screw using the freewheel mechanism by pivoting the handle body back and forth is difficult in confined spaces, as the back-torque must be overcome to rotate the handle body in the freewheel direction. This is generally only possible if the engagement of the thread to be turned in the mating thread is correspondingly stiff. State of the art

[0003] Screwdrivers with a direction-reversible freewheel lock, so-called ratchets, are known from the prior art. Screwdrivers with such a ratchet function are disclosed, for example, in DE 10 2007 004 987 A1 or DE 10 2008 055 581 A1.

[0004] Furthermore, screwdrivers are known with an elongated handle body to which a blade is attached in axial extension, the blade having a screw profile or an opening at its free end into which a screw insert can be inserted. Screwdrivers with a transverse handle attached to a blade, which have an integrated freewheel mechanism, are also known.

[0005] With this type of screwdriver, a screw can be gradually screwed into or out of a thread by twisting the handle back and forth. When using these screwdrivers, where the handle and blade are arranged axially one behind the other, the blade is rotated with the tips of the thumb and one or more fingers for rapid turning. This method of using a screwdriver is commonly referred to as "twisting."

[0006] DE 102 19 418 B4 discloses a tool holder that can be fitted with a bit and has an axially limited-movement actuating sleeve, which can be inserted into the chuck of a screwdriver. A freely rotatable sleeve is located in a circumferential recess of the actuating sleeve, and its circumferential surface forms a handle for the screwdriver. When operating a screwdriver, the freely rotatable sleeve can be held in place with the index finger and thumb.

[0007] German patent DE 10 2018 113 481 A1 discloses a screwdriving tool with a transverse handle that can be attached to a blade. A freely rotating sleeve is mounted on the blade and is directly adjacent to the handle body. Summary of the invention

[0008] The invention is based on the objective of further developing the generic screwdriving tool in a way that is advantageous for practical use. In particular, the invention aims to further develop the screwdriving tool in such a way that, even with a smooth thread engagement, the blade can be rotated in a screw direction by a back-and-forth movement of the handle body.

[0009] The problem is solved by the invention specified in the claims. The dependent claims also represent independent solutions to the problem.

[0010] The screw tool according to the invention essentially comprises a sleeve that can be freely rotatably attached to a blade of a screw tool, the circumferential surface of which has one or more openings. The openings are sized such that a user operating the screw tool can exert a slight radial pressure on the blade through the openings with portions of their fingers, in particular the fingertips.

[0011] The blade is axially extended by a handle body into which a direction-reversible freewheel lock is integrated. Radial pressure on the blade can exert a braking torque, allowing the handle body to rotate indefinitely relative to the blade in the handle body's freewheel direction, i.e., opposite to the blade's currently set freewheel direction.

[0012] To tighten or loosen a screw, a rotational impulse can be applied to the handle, turning the screwdriver clockwise or counterclockwise. For example, if the freewheel mechanism is in a freewheel position where clockwise rotation is the blade's freewheel direction, the blade can be quickly rotated clockwise relative to the handle. In this freewheel position, two or three fingers of one hand can grip the sleeve so that the fingertip of at least one finger exerts a radial pressure on the blade, generating a braking torque, through the openings in the sleeve's surface. Simultaneously, if the other hand applies torque to the handle in the handle's freewheel direction (counterclockwise), the freewheel mechanism allows the handle to be quickly rotated relative to the blade.In this way, the handle body can be moved into any desired rotational position without having to reposition the screwdriver. This allows, for example, longer screws to be quickly screwed in or out of a thread. If, however, no braking torque is applied to the blade, the blade can rotate freely within the sleeve when torque is applied to the handle body.

[0013] The freewheel direction can be set using a switch, which is located, for example, in the handle body. The switch can be positioned on the side of the handle body facing away from the blade. To rotate the handle relative to the blade in the freewheel direction, a counter-torque must be overcome, the magnitude of which depends on the design of the freewheel mechanism.

[0014] If the blade is held between two or three fingers of a user's hand in the area of ​​the openings in the sleeve's outer surface, the fingertips, in particular, can be in direct contact with the blade. Other parts of the fingers can also make contact. This skin contact allows the user to exert radial inward pressure on the blade. In this way, the user can generate a braking torque on the blade, thus enabling the screwdriver to twist.

[0015] In principle, it is sufficient for the sleeve to have only one opening with an opening area adapted to the size of a fingertip of an index finger or a thumb of a user's hand. The contour line of a fingertip extends approximately along a circle with a radius between 10 and 15 mm. One portion of this contour line rests on an edge of the opening and forms a support area. Another portion of this contour line, an effective area, acts against the surface of the smooth-walled blade. By varying the radially applied force, the effective area can be made to bear against the blade surface with varying frictional force. According to a further development of the invention, the opening has a distance between two opposing edges that defines an opening width.The opening width is dimensioned such that two fingertip support areas, between which the working area extends, are each supported at one of the two edges. A circular arc, passing through two edge edges of the opening and tangent to the edge of the blade's cross-sectional area, can follow a circular arc that approximately corresponds to the contour of the fingertip of an index finger or thumb. The radius of such an arc can be between 10 and 20 mm. The clear distance between the two edge edges can be between 10 and 14 mm. The opening width is selected so that the screwdriver can be held in a working position with the fingers gripping the sleeve, allowing the other hand to be released from the handle without the cutting edge of the blade protruding from the drive edge of a screw being turned with the screwdriver.By varying the radial force, the fingertip exerts only a minimal frictional force on the blade in the first force-applying position. Nevertheless, the screwdriver is held securely by the fingertip's support areas against the edges of the opening. Furthermore, the opening width is dimensioned such that increasing the radial pressure causes the fingertip to exert a sufficiently large frictional force on the blade to overcome the reverse torque, even when the blade is not coupled to a screw or similar component. Preferably, the sleeve has two opposing openings, allowing the fingertip of the thumb to support itself at the edge of one opening and the fingertip of the index finger to support itself at the edge of the opposite opening.The opening connects an inner wall of the sleeve, which faces the surface of the blade, with a sleeve surface that forms an outer wall of the sleeve. The opening can have an inner diameter in the region of the inner wall and an outer diameter in the region of the sleeve surface, the outer diameter being larger than the inner diameter. Preferably, the opening has an outer edge that runs along the sleeve surface and an inner edge that runs along the inner wall of the sleeve. Between the two edges, there is a rim of the opening against which a support area of ​​the fingertip can rest. The rims of the opening can extend along a circle whose radius is slightly smaller than the radius of a fingertip's contour line. Preferably, lines extend through the rims that intersect at a point of intersection.This intersection point can lie within the cross-sectional area of ​​the blade. It can also lie slightly outside the cross-sectional area. Preferably, however, the intersection point lies within the cross-sectional area and is spaced a certain distance from the center of the blade, through which the blade axis passes. This distance can be greater than 50%, 70%, 80%, or 90% of the blade radius. The opening can have a minimum opening width, which can, for example, extend circumferentially. This opening width is preferably subject to the previously described design dimensioning rules. The opening can have a maximum opening width, which is larger and can, for example, extend axially. However, it is also possible for the minimum opening width to extend axially.

[0016] In a first embodiment of the invention, the sleeve can be a single-piece body. The body can be tubular. The opening can be a slot extending longitudinally along the body. The width of the slot can be slightly smaller than the diameter of the blade, so that the sleeve can be pressed onto the blade by pressing the slot against the blade until the blade snaps into the body as the slot widens. The body is freely rotatable when attached to the blade. The axial length of the body can be shorter than the axial length of the blade, so that the body can also be displaced axially relative to the blade. The axial displacement of the sleeve can be limited, for example, at one end of the blade by a handle body of the screwdriver and at the other end of the blade by a section with a diameter larger than that of the blade.For example, a collar positioned at the end of the blade opposite the handle body can prevent the sleeve from slipping axially off the blade. The length of the sleeve can also essentially correspond to the length of the blade. The sleeve can be made of a metal or a plastic material, for example.

[0017] In a second embodiment, the free-running sleeve can consist of two sleeve components connected to each other by a releasable snap connection. The sleeve components can be identical in design. For example, the outer surface of the sleeve components can be semi-cylindrical. One or more window-shaped openings can be arranged in the outer surface of each sleeve component. The size of the windows can be adapted to the size of fingertips. For example, the window openings can be elliptical, with the area of ​​the ellipse being smaller, larger, or equal to the area of ​​a fingertip. However, the openings can also assume any geometric shape, provided that the size of the openings is chosen such that radial pressure can be exerted on the blade, at least by a portion of a user's finger.

[0018] In one embodiment of the invention, the sleeve components can each have two windows arranged one behind the other in the axial direction. This allows, for example, the tip of the index finger as well as the tip of another finger, such as the ring finger, to be brought into partial skin contact with the blade.

[0019] If the sleeve components are connected to form a sleeve, one or more of the windows arranged in the outer surface of the sleeve components can be positioned opposite each other in a plane of rotation. This allows the blade to be easily grasped between the index finger and thumb through the openings. To exert a braking torque on the blade, the fingertips must apply slight radial pressure directly to the blade through the windows. However, the windows are also designed so that the fingertips can simply rest on them without exerting any radial pressure on the blade that would generate a braking torque.

[0020] The sleeve's outer surface can be textured to improve grip and ensure safe handling. This textured surface can extend across almost the entire outer surface or be limited to selected areas. For example, it can cover areas the width of a fingertip. The textured surface can be arranged circumferentially and / or axially between the window openings.

[0021] The width of the openings can be between 2 mm and 20 mm, preferably between 4 mm and 10 mm. The width of the edge of the openings, which acts as a bearing surface, can be between 0.5 mm and 10 mm, preferably between 1 mm and 4 mm. The bearing surfaces can be designed as sloping flanks enclosing an angle between 90° and 170°, preferably between 130° and 160°.

[0022] The handle body and the blade of the screwdriver can preferably be arranged axially one behind the other. A direction-reversible freewheel lock is preferably arranged in the handle body. The handle body can, for example, have the form of an elongated handle or a transverse handle, as disclosed, for example, in DE 10 2018 113 481 A1. By moving the handle arm back and forth about a rotation axis extending in the direction of the blade, the blade can be rotated stepwise in a constant direction. The blade can have a profile end that can be connected in a rotationally fixed manner to a socket, which can be fitted onto the hexagonal profile of a nut or bolt. Brief description of the drawings

[0023] Exemplary embodiments of the invention are explained below with reference to the accompanying drawings. These show: Fig. 1 a perspective view of a first embodiment of a screw tool 1 with a sleeve 3 rotatably attached to the blade 2, which has a slot-shaped opening 4; Fig. 2 a perspective view of the screw tool 1 according to Fig. 1, wherein the sleeve 3 is not attached to the blade 2; Fig. 3 a side view of the sleeve 3 having a slot-shaped opening 4; Fig. 4. a section along the plane IV-IV-IV in Fig. 1; Fig. 5 a cut according to Fig. 4, wherein the blade 2 slides along the guide flanks 6 flanking the opening 4 when the sleeve 3 is removed; Fig. 6 a perspective view of a second embodiment of the sleeve 3 which can be attached to the blade 2 of the screw tool 1, wherein a recess 8 is arranged in the outer surface 9 of the sleeve 3; Fig. 7 a section along the plane VII-VII-VII in Fig. 6; Fig. 8 a side view of a third embodiment of the sleeve 3, wherein a longitudinally extending rib 11 is arranged on the inner wall 7 of the sleeve 3; Fig. 9 a cut along line IX-IX in Fig. 8; Fig. 10 a perspective view of a fourth embodiment of the sleeve 3 attached to the blade 2, wherein a rib-shaped profile 12 is arranged on the outer surface 9; Fig. 11 a section along the plane XI-XI-XI in Fig. 10; Fig. 12 a side view of a fifth embodiment of the sleeve 3, wherein a longitudinally extending rib 11 is arranged on the inner wall 7 of the sleeve 3; Fig. 13 a cut along line XIII-XIII in Fig. 12; Fig. 14 another representation of the in the Fig. 12 and Fig. 13 shown embodiment of the sleeve 3 having the profiling 12; Fig. 15 another representation of the in the Fig. 12, Fig. 13 and Fig. 14 shown embodiment of the sleeve 3 having the profiling 12; Fig. 16 a perspective view of a sixth embodiment of the screw tool 1, wherein the sleeve 3 consists of two detachably connectable sleeve components 13, 13', in the outer surfaces 9 of which two window-shaped openings 4 are arranged; Fig. 17 a section along the plane XVII-XVII-XVII in Fig. 16; Fig. 18 a perspective representation of the in the Fig. 16 and Fig. 17 shown embodiment, wherein the sleeve components 13, 13' are separated from each other; Fig. 19 a side view of a seventh embodiment of the sleeve 3, wherein the longitudinally extending rib 11 is arranged on the inner wall 7 of the sleeve 3; Fig. 20 a section along the line XX-XX in Fig. 19; Fig. 21 a front view of the in the Fig. 19 and Fig. 20 illustrated embodiment of sleeve 3; Fig. 22 a side view of the sleeve components 13, 13' connected to each other by means of the snap connection 14; Fig. 23 a representation of an eighth embodiment of the sleeve 3 which can be attached to the blade 2 of the screw tool 1, wherein the outer surface 9 of the sleeve components 13, 13' has a profile 12; Fig. 24 a side view of a sleeve component 13, 13' according to Fig. 23, wherein a rib 11 is arranged on the inner wall 7 of the sleeve component 13, 13'. Description of the embodiments

[0024] The Fig. Figure 1 shows a first embodiment of a screw tool 1 according to the invention. A blade 2 is attached to a handle body 5, which is designed, for example, as a transverse handle. Reference numeral 22 indicates a freewheel lock arranged in the handle body 5, the freewheel direction of which can be switched by a changeover switch 23. A freewheel lock is shown, for example, in DE 20 2018 101 989 U1, and for details of the freewheel lock, reference is made to that disclosure. A screw profile, for example a polygonal profile, can be arranged at a free end of the blade 2, as indicated by dashed lines. According to the invention, a sleeve 3 is detachably attached to the blade 2. The sleeve 3 is designed, for example, as a one-piece body having a circular cylindrical shape. A longitudinally extending slot-shaped opening 4 is arranged in the outer surface 9 of the sleeve 3. The slot 4 is open in the axial direction.

[0025] The diameter of the sleeve 3 is larger than the diameter of the blade 2 (see Fig. 4) so ​​that the sleeve 3 is freely rotatable about the axis of rotation A of the screwdriver 1 when a torque is applied to the handle body 5. The axial movement of the sleeve 3 is limited by the handle body 5 and by a collar 11 arranged at the free end of the sleeve 3. The length of the sleeve 3 preferably corresponds approximately to the length of the blade 2, so that the ends of the sleeve 3 are directly adjacent to the handle body 5 and the collar 11, respectively.

[0026] If a user applies torque to the cross handle 5 of the screwdriver 1 with one hand, the sleeve 3 can be held between two or three fingers of the other hand. The width w of the slotted opening 4 is selected such that a radial pressure is exerted on the blade 2 by a portion of at least one of the fingers holding the sleeve, which rests at least partially on the opening 4. For example, a portion of the fingertip of one of the user's fingers can exert the radial pressure. The radial pressure creates a braking torque on the blade 2. If a torque is simultaneously applied to the handle body 5 in the direction of free rotation, the handle body 5 can be quickly rotated or "twisted" relative to the blade 2.

[0027] As in Fig. As shown in Figure 2, the sleeve 3 is detachable from the blade 2. Fig. Figure 3 shows a frontal view of the sleeve 3 with the slotted opening 4.

[0028] To attach the sleeve 3 to the blade 2, the width w of the opening 4 of the sleeve is chosen such that the sleeve 3 can be applied to the blade 2 by pressing the slot 4 against it. As shown in Fig. As can be seen in Figure 4, the diameter d of the blade 2 is smaller than the inner diameter of the sleeve 3. Therefore, the inner wall 7 of the sleeve 3, when attached to the blade 2, is spaced away from the outer surface 16 of the blade 2, and the sleeve 3 is freely rotatable relative to the blade 2.

[0029] The slot-shaped opening 4 is flanked by guide flanks 6 formed by the body of the sleeve 3. When the sleeve 3 is attached to or detached from the blade 2, the outer surface 16 of the blade 2 slides along the guide flanks 6. The sleeve 3 is preferably made of an elastically deformable material, for example a plastic, which, as described in Fig. Figure 5 shows that this allows the opening 4 to spread open when attaching or detaching the sleeve 3 from the blade 2.

[0030] Each of the guide flanks 6 is connected to a radially inward pointing nose 17, against which the mantle surface 16 of the blade 2 can be supported when radially inward pressure is exerted on it.

[0031] In Fig. Figure 6 shows a second embodiment of the invention. An elliptical recess 8 is arranged centrally in the axial direction of the cylindrical surface 9 of the circular sleeve 3. The principal axis of the ellipse runs parallel to the axis of rotation A. The recess 8 can also have a different shape. Furthermore, several recesses can be arranged on the cylindrical surface 9. The position of the recesses on the cylindrical surface can be variably chosen.

[0032] According to the invention, the size of the recess 8 is selected such that the fingertip of at least one of the user's fingers holding the sleeve 3 can lie at least partially within the recess 8. The recess 8 increases the frictional force of the user's fingers, which hold the sleeve 3 in the area of ​​the outer surface 9 of the sleeve 3 adjoining the opening 4, and thus prevents these fingers from slipping. To exert radial pressure on the blade 2 through the opening 4, the sleeve 3 can, for example, be held between two fingers, with the thumb pressing at least partially through the opening 4 onto the blade 2 and the fingertip of the index finger lying diametrically opposite, at least partially, within the recess 8.

[0033] The depth of depression 8 is, as in Fig. 7 can be seen, preferably smaller than half the thickness of the mantle 18 of the sleeve 3. The recess 8 can also have other geometric dimensions.

[0034] Fig. Figure 8 shows a further embodiment of the invention. The sleeve 3 has a rib 11 arranged on its inner wall 7. The rib 11 preferably extends longitudinally along the sleeve 3. The rib 11 can, as shown by way of example, have an elliptical shape. However, the rib 11 can also have another shape, for example, a rectangular shape. Several ribs 11 can also be arranged parallel to each other, in particular at uniform intervals, on the inner wall 7 of the sleeve 3. The ribs 11 can also, for example, each extend circumferentially, with several ribs 11 being arranged vertically one above the other at uniform intervals. The ribs 11 preferably extend longitudinally along the sleeve 3 over substantially its entire length. However, the length of the ribs 11 can also be less than the longitudinal length of the sleeve 3.At least one rib 11 is preferably arranged diametrically opposite the opening 4. The ribs 11 preferably project into the gap formed between the outer surface 16 and the inner wall 7 of the sleeve 3 when the sleeve 3 is fastened. If no radial pressure is exerted on the blade 2 through the opening 4, the rib 11 can be spaced apart from the outer surface 16 of the blade 2. However, if radial pressure is exerted on the blade 2 through the opening 4, a section of the outer surface 16 of the blade 2 diametrically opposite the opening 4 is pressed against the rib 11. As a result, the outer surface 16 of the blade 2 presses against the inner wall 7 of the sleeve 3 only in the region of the rib 11, creating a frictional force between the surface of the rib 11 and the outer surface 16 of the blade 2.Together with the sections of the fingers that press through the opening 4 onto the blade 2, a braking torque is exerted on the blade 2.

[0035] To increase the grip of the outer surface 9 of the sleeve 3, as described in Fig. Figure 10 shows a profile 12. The profile 12 can, for example, be rib-shaped, with the ribs arranged as shown in the Fig. The ribs, shown in Figures 10 to 15, extend in the circumferential direction of the surface 9. They are, in particular, evenly spaced from one another and preferably extend over the entire surface 9. However, the profiling 12 can also be arranged only on individual sections of the surface 9 and / or consist of elements having a different geometric shape. For example, the profiling 12 can consist of areas of the surface 9 whose roughness has been increased by subsequent machining.

[0036] The level of the Fig. The rib-shaped profile 12 shown in Figure 11 corresponds approximately to the depth of the recess 8. However, the profile 12 can also be higher or lower than the depth of the recess 8.

[0037] In another one in the Fig. In the embodiment shown in Figures 12 to 15, in addition to the rib-shaped profile 12 arranged on the outer surface 9 of the sleeve 3, a rib 11 is arranged on the inner wall 7 of the sleeve 3. The rib 1 runs, as in the embodiment shown in the Fig. 8 and Fig. 9 illustrated embodiment, in the longitudinal direction of the sleeve 3.

[0038] As in Fig. As can be seen in Figure 15, the profiling 12 extends over almost the entire surface 9 of the sleeve 3, with the recess 8 being cut out.

[0039] In the Fig. Figures 16 to 18 show a further embodiment of the invention. Here, the sleeve 3 consists of two sleeve components 13, 13' which can be detachably connected to one another. Preferably, the sleeve components 13, 13' are connected to one another by means of a snap connection. Two windows 4 are arranged in the lateral surface 9 of each sleeve component 13, 13'. The windows 4 are arranged vertically one above the other in the axial direction. The shape of the windows 4 is essentially elliptical, with the major axis of the ellipse running parallel to the axis of rotation A. The windows 4 of the sleeve components 13, 13' are aligned when the sleeve components 13, 13' are connected, as shown in Figure 16 to 18. Fig. 17 can be seen, diametrically opposite.

[0040] The opening area of ​​the windows 4 is such that radial pressure can be exerted on the blade 2 through the windows 4, at least with a finger segment. The opening area is preferably adapted to the size of a fingertip.

[0041] Fig. Figure 17 schematically shows the sleeve 3 held between two fingers of a user. The fingertip presses in certain areas through the opening 4 onto the outer surface 16 of the blade 2. The radial pressure on the blade 2 is exerted, for example, by two finger sections that press onto the blade 2 through windows 4 arranged relative to each other.

[0042] The supporting areas of the fingertip bear against at least one of the edges 15, with one working area of ​​the fingertip being in contact with the surface of the blade 2. Preferably, however, two supporting areas of the fingertip bear against both edges 15 simultaneously to securely hold the sleeve 3 in a working position. The width WI or WA of the opening 15 is accordingly adapted to the curved shape of an average user's fingertip.

[0043] The sleeve components 13, 13' can be, as in the Fig. 16, Fig. 18, Fig. 22 and Fig. 23 can be seen, they are identical in construction. However, the sleeve components 13, 13' can also be designed differently. The rim edge of the in the Fig. Each of the sleeve components 13, 13' shown in Figures 16 to 24 has several projections 19, 19' and recesses 20, 20' which, when connected, engage in the recesses 20, 20' and projections 19, 19' of the other sleeve component 13, 13' respectively (see Figures 16 to 24). Fig. 16 and Fig. 22).

[0044] The snap connection 14 connecting the sleeve components 13, 13' to each other is in cross-section in Fig. 17. The edge of the sleeve component 13, 13' each forms a stepped profile which interlocks with a stepped counter-profile of the respective other sleeve component 13, 13' in the area of ​​the projections 19, 19' or grooves 20, 20'.

[0045] As in Fig. As can be seen in Figure 18, a notch 19 can be arranged at one end of the sleeve component 13, 13' within the edge that partially surrounds the end face opening. The tip of a tool, for example, can be inserted into this notch 19 in order to release the snap connection 14 between the sleeve components 13, 13' by means of leverage exerted on the tool, thus removing the sleeve 3 from the blade 2.

[0046] The rim 15 surrounding the window opening 4 forms a support surface on which a section of a finger can be placed. The rim 15 is obliquely flattened such that by changing a radial force on the fingertip resting on the flattened edges, a section of the fingertip is moved from a first position, in which the section interacts with the blade 2 with no or minimal friction, to a second position, in which the section interacts with the blade 2 with friction or increased friction. The rim 15 forms oblique flanks enclosing an angle α. The angle α can be chosen such that a finger section of the user's finger resting on the support surface 15 exerts a slight radial pressure on the blade 2, so that no braking torque acts on the blade 2 when no twisting of the screwdriver 1 is desired.If, on the other hand, a greater radial pressure is exerted on the sleeve 3 with the fingertips, so that a braking torque acts on the blade 2, a central area of ​​the fingertip in the area of ​​the window opening 4 is in skin contact with the blade 2 and a section surrounding the central area of ​​the fingertip rests on the support surface 15 (see . Fig. 17).

[0047] As in Fig. As shown in Figure 18, the sleeve components 13, 13', depicted as identical in construction, are assembled in opposite orientations to the sleeve 3. One of the projections 19, 19' formed by the sleeve components 13, 13' engages in elongated grooves 20, 20' formed by the other sleeve component 13, 13'.

[0048] The Fig. Figures 19 to 22 show a further embodiment of the invention. Three ribs 11, 11', 11" are arranged on the inner wall 7, each running parallel to the axis of rotation. As in Fig. As can be seen in Figure 19, one of the ribs 11, which is arranged centrally between the two other ribs, 11', 11" and interrupted by the two window openings 4, extends over almost the entire length of the sleeve component 13, 13'. The other ribs 11, 11' are arranged in the region of the projections 19, 19' and project radially inwards from the inner wall 7 of the sleeve 3 (see Figure 19). Fig. 20).

[0049] The edges 15 are designed as sloping flanks, with imaginary lines extending along the sloping flanks intersecting at a center point M located at a distance b from the axis of rotation A. The distance b and an angle α enclosed by the sloping flanks are chosen such that the fingertip of a user's finger can rest on the sloping flanks without exerting a braking torque or only a slight braking torque on the blade 2.

[0050] The edges 15 extend onto surfaces that can be planes or – as in the exemplary embodiment – ​​concave surfaces. The edge surface of the edge 15 transitions into the sleeve shell surface 9, forming an edge 15', and into the inner wall 7 of the sleeve 3, forming a further edge 15". The Fig. The lines L shown in Figure 20 pass through the edge edges 15' and 15". The intersection point M of the two lines L preferably lies within the cross-sectional area of ​​the blade 2 and is only slightly separated from the edge of the cross-sectional area. A distance b to the center of the cross-sectional area of ​​the blade 2 is preferably at least 90% of the radius of the cross-sectional area. The angle α is preferably <180°. In the exemplary embodiment, it is 150°. The angle can be in a range between 170° and 130°. However, it can also be in a range between 160° and 140°.

[0051] The width of the rim 15, i.e., the distance between the rim edges 15' and 15", can be in the range between 0.5 mm and 10 mm. Preferably, the width is in the range between 1 mm and 4 mm.

[0052] The inner diameter WI of the opening 4 can be between 4 mm and 8 mm. Preferably, it is between 5 mm and 12 mm. The outer diameter WA of the opening 4 can be between 8 mm and 14 mm. Preferably, it is between 9 mm and 11 mm. In a preferred embodiment, the inner diameter WI is 5 mm and the outer diameter WA is 10 mm. In this embodiment, the diameter d of the blade is 11 mm. The wall thickness of the sleeve is 2 mm, with the ribs 11 having a height of approximately 1 mm.

[0053] In the Fig. 7 and Fig. In addition, a straight line G is drawn in 20, which runs through the edge edges 15" of the opening 4. In the case of the Fig. In the embodiment shown in Figure 7, the straight line G intersects the cross-sectional area of ​​the blade 2 and runs at a distance b from the center of the cross-sectional area, where the distance b is at least 80% of the radius of the cross-sectional area.

[0054] In the Fig. In the embodiment shown in Figure 20, the straight line G is spaced from a vertex S of the edge of the cross-sectional area of ​​the blade 2. This distance is 10% to 20% of the radius of the cross-sectional area of ​​the blade 2. Fig. Figure 20 further shows a circular arc K, which can have a radius between 10 and 20 mm and which passes through the closest edge edges 15" of the opening 4. The circular arc K also passes through the vertex S and approximately represents the contour line of a fingertip, as described by the Fig. 17 in an effective position.

[0055] Another embodiment of the invention is described in the Fig. 23 and Fig. Figure 24 shows that, in addition to the features described above, the sleeve components 13, 13' have a rib-shaped profile 12 in the area of ​​the projections 19. The profile 12 comprises several vertically stacked ribs extending perpendicular to the axis of rotation A. The profile 12 extends essentially to the level of the window openings 4.

[0056] If no braking torque is to be applied to the sleeve 3, the user's fingers can hold the sleeve 3 in the area of ​​the profile 12. If a torque is applied to the handle body 5, the blade 2 can rotate freely within the sleeve 3.

[0057] The foregoing statements serve to explain the inventions covered by the application as a whole, which each independently further develop the prior art at least through the following combinations of features, whereby two, several or all of these combinations of features may also be combined, namely:

[0058] A screw tool characterized in that the sleeve 3 has at least one opening 4 which has an opening surface adapted to a fingertip of an index finger or thumb of a hand such that, by means of an effective area acting through the opening 4 onto the blade surface of the fingertip which is supported on an edge 15 of the opening 4 with a support area, no or only a slight frictional force can be exerted on the blade 2 by changing a radial force in a first force application position, in which the blade 2 can rotate freely or almost freely in the sleeve 3, and in a second force application position an increased frictional force can be exerted on the blade 2, in which the handle body 5 can be rotated against the counter-rotational torque relative to the blade 2.

[0059] A screw tool characterized in that a width W, WA, WI of the opening 4 measured in a circumferential or axial direction is adapted to a diameter d of the blade 2 such that two support areas of the fingertip support the screw tool in a working position in both the first force application position and the second force application position against opposing edges 15 of the opening 4.

[0060] A screwdriving tool characterized in that a straight line G passing through edge edges 15' of the opening 4 intersects the cross-sectional area of ​​the blade 2 at a distance b from an axis A of the blade 2 which is at least 80% of the radius of the blade 2, or that a straight line G passing through edge edges 15' of the opening 4 lies outside the cross-sectional area of ​​the blade 2 and has a maximum distance to the blade surface of 20% of the radius of the blade 2, or that the opening 4 has an inner width WI in the region of an inner wall 7 of the sleeve 3 and an outer width WA in a sleeve surface 9 which is larger than the inner width WI, and two lines L drawn through edge edges 15', 15" of the obliquely running edges 15 intersect at a point of intersection M which lies within the cross-sectional area of ​​the blade 2 and is spaced from an axis A of the blade 2 by a distance b which is greater than 50%, 70%,80% or 90% of the radius of the blade 2, or which lies slightly outside the cross-sectional area of ​​the blade 2, or that a circular arc line K passing through the edge edges 15" of the opening 4, which determine the clear width WI, and through a vertex S located midway between the edge edges 15" and on the blade surface, has a radius that approximately corresponds to the contour line of the fingertip of an index finger or a thumb.

[0061] A screw tool characterized in that the sleeve 3 is a one-piece body, wherein the opening 4 is a longitudinally extending slot.

[0062] A screw tool characterized by the fact that the openings 4 are diametrically opposed to each other.

[0063] A screw tool characterized in that the sleeve 3 consists of at least two sleeve components 13, 13' that can be detachably connected to one another.

[0064] A screw tool characterized in that the sleeve components 13, 13' are identical in construction.

[0065] A screw tool characterized in that the sleeve components 13, 13' are connected to each other via a snap connection 14.

[0066] A screw tool characterized in that at least one longitudinally extending rib 11, 11', 11" is arranged on an inner wall 7 of the sleeve 3.

[0067] A screw tool characterized in that a circumferentially extending width W of the openings 4 and the edges 15 of the openings 4 are obliquely flattened in such a way that by changing a radial force on the fingertip resting on the flattened edges 15, a section of the fingertip can be brought from a first position, in which the section interacts with the blade 2 with no or less friction, to a second position, in which the section interacts with the blade 2 with friction or increased friction.

[0068] A screw tool characterized in that the width W of the opening 4 is between 2 mm and 20 mm, preferably between 4 mm and 10 mm.

[0069] A screw tool characterized in that the width of the edge 15 of the openings 4, which is designed as a bearing surface, is between 0.5 mm and 10 mm, preferably between 1 mm and 4 mm, and / or the bearing surfaces are designed as inclined surfaces that enclose an angle between 90° and 170°, preferably between 130° and 160°.

[0070] All disclosed features are essential to the invention (individually, but also in combination with one another). The disclosure of this application hereby incorporates in full the disclosure content of the associated / attached priority documents (copy of the earlier application), also for the purpose of including features of these documents in the claims of the present application. The dependent claims, even without the features of a referenced claim, characterize independent inventive developments of the prior art, in particular for the purpose of filing divisional applications based on these claims. The invention specified in each claim may additionally include one or more of the features described above, in particular those identified by reference numerals and / or listed in the reference numeral list.The invention also relates to design forms in which individual features mentioned in the preceding description are not realized, in particular insofar as they are recognizably unnecessary for the respective purpose or can be replaced by other technically equivalent means. List of reference symbols 1 screwdriver 2 blades 3 Sleeve 4 Opening 5 handle bodies 6 Leading flank 7 Inner wall 8 In-depth study 9 Sleeve shell area 10 collars 11th rib 11' rib 11" rib 12 Profiling 13 Sleeve component 13' Sleeve component 14 Snap connection 15 Rand 16 blade sheath surface 17 Nose 18 coat 19 lead 19' lead 20 Nut 20' Nut 21st notch 22 freewheel locks 23 switches b distance d diameter A axis of rotation G Straight K circular arc M Intersection point S vertex W width WA Wide outside WI width inside α angle QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2007 004 987 A1

[0003] DE 10 2008 055 581 A1

[0003] DE 102 19 418 B4

[0006] DE 10 2018 113 481 A1 [0007, 0022] DE 20 2018 101 989 U1

[0024]

Claims

[1] Screwdriver (1) with a handle body (5) having a freewheel lock and attached to a blade (4) having a smooth blade surface, wherein the blade (4) is freely rotatable in a sleeve (3), wherein by rotating the handle body (5) in a locking direction of the freewheel lock a torque can be transmitted to the blade (4) and by rotating in a freewheel direction opposite to the locking direction, it can be rotated by overcoming a back torque of the freewheel lock relative to the blade (2), characterized by that the sleeve (3) has at least one opening (4), which has an opening surface adapted to the fingertip of an index finger or thumb of a hand, that, with an effective area acting through the opening (4) on the blade surface of the fingertip which is supported on an edge (15) of the opening (4) with a support area, by changing a radial force in a first force application position, no or only a slight frictional force can be exerted on the blade (2), in which the blade (2) can rotate freely or almost freely in the sleeve (3), and in a second force application position an increased frictional force can be exerted on the blade (2), in which the handle body (5) can be rotated against the counter-torque relative to the blade (2). [2] Screwdriver according to claim 1, characterized by , that a width (W, WA, WI) of the opening (4) measured in a circumferential or axial direction is adapted to a diameter (d) of the blade (2), that two support areas of the fingertip support the screwing tool in a working position, holding it in both the first force application position and the second force application position against opposite edges (15) of the opening (4). [3] Screwdriver according to any one of the preceding claims, characterized by , that a straight line (G) passing through edge edges (15') of the opening (4) intersects the cross-sectional area of ​​the blade (2) at a distance (b) from an axis (A) of the blade (2) which is at least 80% of the radius of the blade (2), or that a straight line (G) passing through the edge edges (15') of the opening (4) lies outside the cross-sectional area of ​​the blade (2) and has a maximum distance to the blade surface of 20% of the radius of the blade (2) or that the opening (4) in the area of ​​an inner wall (7) of the sleeve (3) has an inner width (WI) and in a sleeve shell surface (9) has an outer width (WA) which is larger than the inner width (WI), and two lines (L) drawn by edge edges (15', 15") of the oblique edges (15) intersect at a point of intersection (M) which lies within the cross-sectional area of ​​the blade (2) and is spaced from an axis (A) of the blade (2) by a distance (b) which is greater than 50%, 70%, 80% or 90% of the radius of the blade (2), or which lies slightly outside the cross-sectional area of ​​the blade (2), or that a circular arc line (K) running through the edge edges (15") of the opening (4) which determine the clear width (WI) and through a vertex (S) located midway between the edge edges (15") and on the blade surface has a radius which approximately corresponds to the contour line of the fingertip of an index finger or a thumb. [4] Screwdriver according to claim 1, characterized by that the sleeve (3) is a one-piece body, wherein the opening (4) is a longitudinally extending slot. [5] Screwdriver according to claim 1, characterized by , that the openings (4) are diametrically opposed to each other. [6] Screwdriver according to claim 1, characterized by , that the sleeve (3) consists of at least two sleeve components (13, 13') that can be detachably connected to each other. [7] Screwdriver according to claim 3, characterized by , that the sleeve components (13, 13') are identical in construction. [8] Screwdriver according to claim 3 or 4, characterized by , that the sleeve components (13, 13') are connected to each other via a snap connection (14). [9] Screwdriver according to any one of the preceding claims, characterized by , that at least one longitudinally extending rib (11, 11', 11") is arranged on an inner wall (7) of the sleeve (3). [10] Screwdriver according to any one of the preceding claims, characterized by , that a circumferentially extending width (W) of the openings (4) and the edges (15) of the openings (4) are obliquely flattened in such a way that by changing a radial force on the fingertip resting on the flattened edges (15) a section of the fingertip can be brought from a first position in which the section interacts with the blade (2) with no or less friction to a second position in which the section interacts with the blade (2) with friction or increased friction. [11] Screwdriver according to claim 10, characterized by , that the width (W) of the opening (4) is between 2 mm and 20 mm, preferably between 4 mm and 10 mm. [12] Screwdriver according to claim 2, characterized by, that the width of the edge (15) of the openings (4) designed as a bearing surface is between 0.5 mm and 10 mm, preferably between 1 mm and 4 mm and / or the bearing surfaces are designed as inclined surfaces enclosing an angle between 90° and 170°, preferably between 130° and 160°. [13] Screwdriver, characterized by one or more of the characterizing features of any of the preceding claims.

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