pluggable connector and pluggable tool

Abstract

A pluggable connecting element for tools comprising at least a fitting (5) with at least one fastening means (6) for attachment to a handle element (4) and at least one retaining sleeve (7) with at least one locking element (8), wherein the retaining sleeve (7) is designed as a hollow cylinder and is open at both ends, and wherein the fitting (5) is at least partially cylindrical and, in a use position, is at least partially inserted into the retaining sleeve (7) and is detachably fixed to the retaining sleeve (7) by means of the at least one locking element (8), wherein the outer diameter of the fitting (5) is 92-96% of the inner diameter of the retaining sleeve (7).

Description

[0001] This document describes a modular, interlocking connecting element for tools, which consists of several parts. Furthermore, it describes a tool with such an interlocking connecting element, which, depending on the desired application, can be assembled with an interchangeable tool head or separated / disassembled. background

[0002] There are many different tools for various purposes. To be prepared for as many different situations as possible, it's advisable to have a wide range of tools available or carry them with you. This is particularly relevant for fire departments, technical relief organizations, and other aid and rescue organizations, as well as the military, which require a variety of tools depending on the specific operation. For example, rakes and hoes are often used during floods to retrieve objects from the water. Firefighting operations require fire beaters, pike poles, shovels, and other similar equipment. A disadvantage of this approach is that each tool must be carried separately in its assembled state, which is very space-consuming and logistically challenging.

[0003] Currently, tool heads are permanently attached to a handle. If the tool is damaged, for example, because the handle breaks or the tool head is damaged, the components cannot be easily replaced, especially not during use, as both a replacement part and the necessary tools for the replacement are required. A quick component exchange is not possible.

[0004] Storing bulky and dirty tools is also difficult without contaminating neighboring, clean tools or the transport vehicle itself. For example, brooms can become soiled with contaminated oil absorbent after cleaning up an oil spill and transfer this to the transport vehicle or other tools. On-site cleaning is often not possible. Tools can also be contaminated with other liquids or operating fluids that may be present during technical assistance operations, such as responding to a traffic accident.

[0005] Furthermore, the tools used in professional operations by fire departments, technical relief organizations, etc., are exposed to very harsh conditions. Therefore, the tools must also be mechanically robust and particularly stable, able to withstand extreme temperatures, i.e., both high and low temperatures, and resistant to dust, dirt, moisture, and, in some cases, aggressive and hazardous chemicals such as battery acid. At the same time, these tools must be transported safely and properly stowed on the transport or emergency vehicle so that any contaminated tools pose no danger. State of the art

[0006] Currently available snap-together tools are unsuitable for withstanding the harsh conditions encountered during operations by fire departments, technical relief organizations, and similar services. Tools with interchangeable heads are predominantly found in the leisure sector, especially in gardening. These allow for the exchange of tool heads on trowels, rakes, weeders, and similar items. However, the common coupling mechanisms are susceptible to dirt and mechanically weak, as they are designed for single-use in a garden setting.

[0007] Furthermore, connections are also known in which a handle with a screw thread at one free end can be screwed into a corresponding socket with an internal thread on a tool head. A disadvantage of this is that the handle can loosen during use, as it can also unscrew itself from the socket, potentially causing the tool head to detach from the handle in the worst-case scenario. Another disadvantage is that such a screw connection can only withstand external forces to a limited extent. It is also a disadvantage that dirt getting into the thread can block the connection between the handle and tool head, rendering the tool unusable.

[0008] US 5,743,580 A describes a handle and post assembly with a plurality of attachments, wherein, in the disclosed embodiments, the attachments include a digging attachment, a rake attachment, and a sweeping attachment. The attachments are each attached to the post via a thread, the post having an external thread at its lower end that can be screwed into an internal thread of one of the attachments, thus providing a detachable connection between the post and the attachments. A disadvantage of this design is that, firstly, the screw connection between the post and the attachment is susceptible to dirt accumulation, as dirt can block it, and secondly, the screw connection can loosen during use.

[0009] US Patent 2014 / 0348582 A1 discloses a long-handled tool component system with interchangeable tool heads, connectors, handles, and grip surfaces. The described connector system consists of a receiver and a connector, the receiver having a polygonal locking rod and a round outer reinforcing ring. The polygonal locking rod is arranged concentrically to the round outer reinforcing ring, into which the connector engages, with the connector and receiver being separated by a plastic sleeve. A disadvantage here, too, is that contamination can block the connector system.

[0010] AT 411 887 B describes a tool comprising at least one interchangeable tool attachment and a handle with a grip. Opposite the grip, the handle features a base body into which various tool attachments can be inserted, with the connection between the tool attachments and the base body being both force-fit and form-fit. The base body itself is cuboid in shape and has a bore perpendicular to its longitudinal axis for receiving the handle. The base body also features blind holes for receiving additional tool components. However, blind holes also prove to be a disadvantage, as they can become blocked by contamination, rendering the tool unusable.

[0011] DE 202 13 299 U1 discloses a handle fastening device for the permanent, positive-locking, and backlash-free connection of a household appliance to a handle. Such household appliances can be garden tools, such as rakes, cultivators, hoes, weed killers, etc. The household appliance to be fastened has an insertion pin that can be inserted into a tool holder at the lower end of the handle and secured. The insertion pin and tool holder are congruent to each other and have a polygonal, preferably rectangular, cross-sectional shape, so that a rotationally fixed connection is formed when inserted. The connection between the household appliance and the handle is effected after insertion by a pre-tensioned leaf spring, whereby a so-called offset engages in a locking recess on the insertion pin and holds it positively.As with the aforementioned devices, contamination can also lead to blockages here, rendering the described tool unusable.

[0012] US 5,915,482 A discloses a hand tool with interchangeable attachments, wherein the hand tool comprises a handle with a dowel extending upward from a lower end of the handle. The dowel has diametrically opposed end sections extending outward from the handle. A shaft is connected to the handle, the shaft having a recess extending within its upper end. The recess is dimensioned to accommodate the lower end of the handle. The upper end has a pair of diametrically opposed vertical slots extending downward in conjunction with the recess. The vertical slots slidably accommodate the opposite end sections of the dowel of the handle. A collar element is slidably mounted on the handle. The collar element has an open upper end with an external thread and an open lower end that widens outward.The open lower end has a pair of diametrically opposed recesses extending upwards. These recesses receive the opposing outer ends of the dowel when fully engaged. Essentially, a bayonet fitting is described as the connecting mechanism, but in the described design, it suffers from the same disadvantages as those found in the aforementioned publications.

[0013] AT 357 811 B describes garden and household tools consisting of a handle to which a tool is detachably attached. The tool has a coupling nipple that can be inserted into a coupling sleeve on the handle. The coupling nipple is shaped like a regular hexagon. It is inserted into the coupling sleeve, which has an internal hexagonal recess, and pressed into one side of the hexagon by means of a clamping screw. This creates a positive connection. The hexagonal shape also ensures a rotation-proof fix. However, any dirt or debris can lead to a complete blockage of the coupling mechanism. Task

[0014] It is therefore an object of the present invention to provide a pluggable connecting element for tools with which different tool heads can be detachably attached to a handle element and which is simultaneously robust, resistant to temperature, dirt and moisture. Furthermore, it is an object of the present invention to provide a tool in which tool heads can be exchanged quickly, intuitively and easily, depending on the application. Solution

[0015] The problem is solved by a pluggable connecting element with the features of claim 1 and a pluggable tool with the features of claim 9.

[0016] A pluggable connecting element for tools is described, comprising at least a fitting with at least one fastening means for attachment to a handle element and at least one retaining sleeve with at least one locking element, wherein the fitting is at least partially inserted into the retaining sleeve in a use position and is detachably fixed to the retaining sleeve by means of the at least one locking element.

[0017] The term "operating position" advantageously refers to the position in which the pluggable connecting element is designed as a fixed connection. In this position, the retaining sleeve and fitting are firmly connected and cannot be separated by external force applied to the retaining sleeve and / or the fitting. In contrast, in a non-operating position, the retaining sleeve and fitting are separate and detachable. In this position, the fitting can be easily moved or pulled out of the retaining sleeve. The individual components of the pluggable connecting element and any attached elements, such as the handle on the fitting, can thus be stored and kept separate.

[0018] Further advantageous embodiments of the pluggable connecting element are disclosed in the dependent claims.

[0019] A tool head can be easily and effectively attached to and detached from a handle using the plug-in connector. The tool head is either attached to the retaining sleeve or can even be integrated with it. This allows different tool heads to be arranged on a single handle via the plug-in connector, as needed, and even sequentially. Tool heads can be selected and connected to a handle depending on the application. This eliminates the need to carry all potentially usable tools separately in their assembled state.

[0020] In a further advantageous embodiment, the pluggable connecting element can be made of metal, particularly advantageously of rust-free metal such as stainless steel. This makes it especially robust and also temperature-resistant. Impacts to the pluggable connecting element, which may occur during use in the operating position, are also well absorbed by the metal without immediately causing breakage or failure of the pluggable connecting element as a component.

[0021] However, this is not meant to be a limitation. It is also conceivable that the pluggable connector could be made of plastic, wood, or a composite material such as carbon fiber or glass-fiber reinforced plastic. Combinations of different materials are also possible. The choice of materials depends on the intended application of the pluggable connector and any other components attached to it. For example, the pluggable connector could also be made of a spark-free or non-sparking metal. Such spark-free or non-sparking metals are particularly advantageous for use in potentially explosive atmospheres and consist of highly wear-resistant non-ferrous alloys such as special bronze or copper-beryllium.

[0022] Furthermore, it is also conceivable that the pluggable connecting element is additionally coated, at least partially, with a corrosion protection layer. Such a corrosion protection layer could be galvanizing, painting, powder coating, or a plastic coating.

[0023] In another advantageous embodiment, the retaining sleeve can be welded, riveted, or screwed to the tool head. This creates a particularly stable and secure material-bonded or force-fit connection between the retaining sleeve and the tool head. This also makes it possible to attach the retaining sleeve to any weldable or screwable tool head. It is also conceivable that the retaining sleeve and the tool head are formed as a single piece. In this way, the retaining sleeve can be integrated during the manufacturing of the tool head itself.

[0024] In a further advantageous embodiment, the fitting can be at least partially cylindrical and the retaining sleeve a hollow cylinder. This advantageously allows the fitting to be easily slid into the retaining sleeve. The retaining sleeve can also be advantageously open at both ends. This allows dirt and liquids to easily flow or fall out of the retaining sleeve on their own. Any subsequent cleaning is therefore particularly easy and thorough. The outer diameter of the fitting is 92-96% of the inner diameter of the retaining sleeve.

[0025] Particularly advantageous is the outer diameter of the fitting being 93-95% of the inner diameter of the retaining sleeve, and even more advantageously 94%. This creates a gap or clearance between the retaining sleeve and the fitting when the latter is at least partially inserted into the retaining sleeve in its operating position. In a specific embodiment, the gap has a width of 1.25 mm, with the outer radius of the fitting being 40 mm and the inner diameter of the retaining sleeve being 42.5 mm.

[0026] Conversely, the outer diameter of the fitting is 4 to 8% smaller than the inner diameter of the retaining sleeve. It is particularly advantageous if the outer diameter of the fitting is 6% smaller than the inner diameter of the retaining sleeve.

[0027] When the fitting is inserted into the retaining sleeve, the gap initially forms an annular gap. As the pluggable connecting element is moved into its operating position, tightening at least one locking element presses the fitting against the inside of the retaining sleeve, thus fixing it in place. Consequently, the gap is no longer annular but, due to the eccentric displacement of the fitting within the retaining sleeve, now has a crescent shape. According to the specific embodiment described above, the gap would be 2.5 mm wide at its widest point. On the opposite side, the gap would be 0 mm wide, meaning the fitting would abut the inner wall of the retaining sleeve at this point.

[0028] The gap between the fitting and the retaining sleeve allows the fitting to be easily inserted into the sleeve without jamming. This is particularly advantageous in rescue operations when a tool head needs to be quickly attached to a handle, such as a pole, using the connecting element. The fitting has some play within the retaining sleeve due to the gap. This play makes it very easy to insert the handle and fitting into the sleeve. Furthermore, this play makes the connecting element tolerant of dirt. This means that the fitting can still be inserted into the retaining sleeve even when dirty, without the dirt significantly hindering or even blocking the insertion.

[0029] A further advantage arises from the fact that the retaining sleeve is open at both ends. This allows, for example, dirt to be easily pushed out of the retaining sleeve when inserting the fitting, preventing further blockage. Liquids can also easily flow through the retaining sleeve. They cannot accumulate inside and cause damage to the sleeve – for example, through corrosion or clogging. This also prevents damage to the fitting or handle element, as they come into little to no contact with any moisture on the retaining sleeve.

[0030] Additionally, the handle can be impregnated to provide extra protection against moisture or other liquids. For example, the handle might have a plastic coating or be oiled.

[0031] In a further advantageous embodiment, the at least one locking element can be screwed into an internal thread arranged on the outer circumference of the retaining sleeve, wherein the screw axis of the internal thread is oriented perpendicular to the longitudinal axis of the retaining sleeve. This means that, for example, in the case of a retaining sleeve in the form of a cuboid, the internal thread is arranged on one of the longitudinal sides and, at the same time, the screw axis is oriented perpendicular to the surface of that longitudinal side. If the retaining sleeve is designed as a cylinder, the internal thread is arranged on the cylindrical surface of this cylinder, with the screw axis being radially oriented. It is also perpendicular to the cylindrical surface. The screw direction of the locking element is the same as the screw direction of the internal thread.

[0032] The at least one locking element is advantageously designed as a locking screw. The internal thread is located on the cylindrical surface of the retaining sleeve. The axis of the internal thread, and thus also the axis of the locking screw, is radially aligned with the cylindrical shape of the retaining sleeve.

[0033] When the locking element is screwed in, in the advantageous form of the locking screw, it presses against the fitting arranged in the retaining sleeve and clamps it firmly within the retaining sleeve. This prevents the fitting from being moved out of the retaining sleeve. The fitting is thus firmly connected to the retaining sleeve by the locking screw.

[0034] The locking screw and fitting form a contact surface at the point of contact.

[0035] The internal thread can be formed by a nut located on the outer circumference of the retaining sleeve, aligned with a corresponding bore in the sleeve wall. The nut simultaneously reinforces the retaining sleeve, allowing it to withstand greater forces exerted by the locking element in this area without the wall failing. In the simplest case, the nut could be welded to the retaining sleeve. However, this is not the only possible solution. For example, the internal thread could be directly integrated into or cut into a bore in the retaining sleeve wall.

[0036] It is also particularly advantageous if the thread pairing, consisting of the internal thread on the retaining sleeve and the external thread on the locking screw, is a fine thread. Firstly, this allows a high force to be applied to the fitting via the locking screw, even with a short internal thread length – for example, due to a thin wall thickness of the retaining sleeve. Secondly, a fine thread has a higher self-locking effect than a standard thread, which means that the locking screw is more difficult to loosen on its own.

[0037] Additionally, it is conceivable that the locking screw and / or the fitting has a roughened surface at the contact point. This roughening or increased surface roughness further enhances the self-locking effect of the locking screw, thus preventing unintentional loosening.

[0038] The locking screw features a convenient T-shaped handle on the screw head. This allows the locking screw to be easily turned by hand without the need for additional tools. The T-handle design is particularly advantageous because it can be gripped and turned even while wearing gloves, such as those required by emergency personnel during operations. The T-handle also allows for effective and, compared to a conventional wing nut, greater force transmission. This enables the locking screw to be tightened very securely, resulting in a very firm and stable fixation of the fitting within the retaining sleeve.

[0039] Furthermore, it is also conceivable that the T-handle is detachable from the locking element. This allows the T-handle to be removed after the locking element has been screwed in. For example, the locking element could be a socket head cap screw, with the T-handle having a free end shaped like a hex key that fits the screw. Instead of a hexagonal profile, any other profile shape could also be used. In such an embodiment, it is advantageous that after the retaining sleeve is attached to the fitting, the entire plug-in connecting element is slim and no T-handle protrudes. For example, a demolition hook attached to a handle element with a plug-in tool and a removable T-handle is more comfortable to use. This prevents the demolition hook from snagging or jamming on surrounding objects, beams, etc.its use can be effectively prevented.

[0040] The locking screw, with its free end opposite the screw head, presses against the fitting, which is at least partially positioned or inserted within the retaining sleeve. This presses the fitting against the inside of the retaining sleeve. The annular gap formed during insertion is thus transformed into a crescent-shaped gap. It is also possible that part of the fitting and part of the handle element are pressed equally against the inside of the retaining sleeve. This creates at least a three-point load. One load point is the contact surface between the fitting and the locking screw. At least two further load points are formed between the fitting and the inside of the retaining sleeve. In particular, the presence of a gap between the fitting and the retaining sleeve, together with the locking screw, can create a three-point load.Such a three-point load is advantageous because it is very stable and can very effectively absorb tilting and bending moments. In the operating position, forces are transferred from the tool head to the retaining sleeve and, via the three-point load, directly and without play to the fitting and the attached handle element. The tool head does not wobble or become detached from the handle element, even under impact, as they are firmly connected in the operating position by the plug-in connector. Surprisingly, it has been shown that even under prolonged, heavy impact stress on the tool head, the connection between the bolt and the retaining sleeve does not loosen. Despite such extreme stress, the plug-in connector between the tool head and the handle element remains firmly fixed in the operating position. Retightening the locking screw is not necessary.

[0041] In a further advantageous embodiment, the fitting can be made up of multiple parts, wherein the fitting has at least one key with a locking recess, at least one guide element and at least one retaining ring.

[0042] These components fulfill several functions. The key can be attached to a handle element, such as a shaft. For this purpose, the handle element advantageously has a recess shaped like the key. The key is held securely in the recess on the handle element. The key is completely enclosed by the material of the handle element. Additionally, the key is fixed to the handle element by at least one fastener. This fastener is designed as a screw, nail, or rivet. It is conceivable that the key has a rounded end. The corresponding recess in which the key is attached would then have an elongated shape. However, this is not a limiting factor, and the key can also have a straight end. In this case, the recess has the shape of a rectangular groove.

[0043] At least one guide element is arranged on the keyway. This can be designed as a bolt, pin, or nipple, which is arranged perpendicularly on the surface of the keyway.

[0044] The retaining ring is located at a free end of the handle element, specifically the end that is inserted into the retaining sleeve when the handle is moved into the operating position. The retaining ring also simultaneously clamps over one end of the key, which points towards the free end of the handle element.

[0045] The retaining ring is advantageously slid or pressed onto the free end of the handle element. It simultaneously spans at least part of the keyway. The retaining ring forms a stable and resistant contact point when, in the operating position, the fitting is at least partially inserted into the retaining sleeve and secured by the locking element. Furthermore, as its name suggests, the retaining ring also fulfills a locking function. If the locking element, which in this embodiment is a locking screw, is unintentionally loosened, the tool head with the retaining sleeve cannot slide completely off the fitting, as the retaining ring presents an obstacle against which the loosened locking element would collide. Complete removal of the fitting from the retaining sleeve is only possible if the locking element is almost completely unscrewed from the retaining sleeve.It is practically impossible for the locking element to unscrew itself completely simply as a result of use. The retaining ring therefore has the advantage that, when using a tool where the tool head and handle are firmly connected by the plug-in connector described here, they cannot easily detach from each other. Even under very extreme conditions, this prevents the tool head from unintentionally detaching from the handle and, in the worst case, being lost.

[0046] Furthermore, the retaining ring serves the function of forming a cylindrical outer circumference at the free end of the handle element on which the fitting is arranged.

[0047] Handle elements in the form of shafts, particularly advantageous in the form of wooden shafts, have a standardized conical shape at their free end, where a tool head can be attached. This allows the handle element to be easily inserted into a corresponding receptacle on the tool head. However, a conical shape is disadvantageous when tilting and torque forces need to be absorbed. The retaining ring compensates for the conical shape at the end. The outer circumference of the retaining ring essentially matches the outer circumference of the handle element before the conical section. In the operating position, the retaining ring and the portion of the handle element before the conical section each form a bearing point inside the retaining sleeve. Together with the contact surface of the locking element, they form a three-point load. This is particularly advantageous for absorbing strong tilting and torque forces, which, among other things,can be caused by blows to the tool head.

[0048] The term "bearing point" or "point load" is not limited to a point in the mathematical sense. It can also refer to a surface bearing area. A bearing point or point load includes any formed contact surface between the fitting and the retaining sleeve, or between the fitting and the locking element.

[0049] A further advantage arises from the keyway design of the fitting. If the handle is made of wood, it swells upon contact with water. The keyway remains attached to the handle by the screws. As the handle dries, the wood contracts again, and the recess in which the keyway is located now firmly encloses it. Due to this positive fit, the keyway cannot be forced out of the recess. Instead, it is further secured within the recess on the handle. Even with repeated cycles of wet and dry conditions, and the resulting alternating swelling and contraction of the wood, the fitting remains firmly attached to the handle. The keyway design prevents the gradual loosening or loosening that is otherwise common under such alternating stresses.This creates a particularly strong and durable connection between the fitting and the handle element.

[0050] Furthermore, it is advantageous that the keyway-shaped fitting can be easily retrofitted to existing tools. Only a corresponding recess needs to be machined into a handle element, which can preferably be made of wood. The keyway of the fitting can then simply be inserted into the recess and fastened with wood screws.

[0051] In a further advantageous embodiment, the at least one guide element and / or the at least one retaining ring can be materially bonded to the at least one key.

[0052] It is particularly advantageous that at least one guide element and / or at least one retaining ring is made of metal and welded to the key, which is also advantageously made of metal. This creates a very stable and durable connection between the guide element and / or retaining ring and the key. The fitting is therefore particularly robust against external forces and heavy use.

[0053] During assembly, the retaining ring is forced onto the free end of the handle element, where the tool head is to be mounted. It also extends at least partially beyond one end of the key. In the area where the retaining ring and key overlap, the retaining ring is welded to the key. This prevents the fitting from being removed from the handle element, even without the fasteners. The key blocks the removal of the retaining ring. The retaining ring also prevents the key from being removed from its recess in the handle element. This provides additional security against unintentional detachment of the fitting from the handle element.

[0054] The retaining ring also serves as reinforcement, making the free end of the handle more durable and resistant. It protects the free end from damage. For example, if the handle is made of wood, the retaining ring prevents chipping or splintering if the free end is struck against something. Such impacts can occur, for instance, when storing or putting the handles away. The retaining ring also prevents swelling and thus widening of the free end when the handle gets wet. This protects the wood at the free end from splintering.

[0055] The guide element, which is advantageously made of metal, is also welded to the key. For this purpose, the guide element, which is designed as a bolt, pin, or nipple, is inserted into a conical bore on the key and welded in place. Advantageously, the guide element has a chamfer at its weldable end, corresponding to the conical bore. As the weld cools, the weld contractes, drawing the guide element further into the bore. This centers the guide element at the weld position and aligns it stably and perpendicularly with the key. Self-centering occurs as the weld cools. This ensures the guide element is firmly connected to the key and break-resistant. The guide element can only break off within the bore under extremely extreme stress.At the same time, this guide element allows the fitting to be easily and intuitively moved into the operating position. The fitting and retaining sleeve are precisely aligned with each other as intended, ensuring that the locking element engages in the locking recess as intended when tightened.

[0056] In a further advantageous embodiment, the locking recess can be designed as an at least partially conical bore into which the at least one locking element can be inserted at least partially in a form-fitting manner.

[0057] For this purpose, the locking element advantageously has a chamfer congruent to the conical bore at its outer free end, which forms a contact surface with the fitting in the operating position. This allows the locking element to be easily inserted into the locking recess and also advantageously centers the fitting when the locking element is inserted into the locking recess. Self-centering occurs when the locking element is tightened, aligning the retaining sleeve and fitting with each other in the position predetermined by the locking recess. Furthermore, it is advantageously conceivable that the conical bore enlarges the contact surface with the locking element, resulting in a better frictional connection. A better frictional connection improves the bond between the retaining sleeve and the fitting. Moreover, this also advantageously prevents the locking element from unintentionally loosening in the operating position.At the same time, the conical shape of the locking recess forms a safety barrier should the locking element be only slightly loosened. The locking element, positioned in the conical bore, can move within the locking recess in its slightly loosened state, but does not slip beyond it. This advantageously holds the retaining sleeve within the locking recess. If the locking element is slightly loosened, the retaining sleeve does not immediately detach from the fitting.

[0058] In a further advantageous embodiment, the retaining sleeve can have at least one recess for the rotationally secure reception of the at least one guide element, wherein the at least one recess is congruent with the at least one guide element.

[0059] In the operating position, the guide element engages in the recess on the retaining sleeve. This allows for a predetermined position of the fitting when at least partially inserted into the retaining sleeve. This prevents the retaining sleeve from rotating and subsequently being locked in place by the locking element. As a result, the tool head is always correctly positioned and secured to the handle element in the operating position via the retaining sleeve and the guide element on the fitting.

[0060] Furthermore, the positive-locking interlocking of the recess and guide element prevents the fitting from being inserted too deeply into the retaining sleeve. This ensures that, in the inserted position, the locking element is always aligned with the locking recess.

[0061] Advantageously, the fit between the guide element and the recess has a certain amount of play. This ensures that the fitting, along with the guide element, can be easily inserted into the retaining sleeve with a certain tolerance, without the guide element becoming jammed. This provides a tolerance for contamination. Minor contamination does not immediately block the recess, so even when the retaining sleeve and / or the fitting or guide element is dirty, it can still be moved into its operating position. Furthermore, the recess can advantageously be designed as a guide groove. This guide groove is also advantageously shaped like an elongated slot with one open side. The guide element can be inserted into the guide groove from this open side to move the fitting and retaining sleeve into their operating position.Furthermore, the guide groove can advantageously have chamfers on its open side. These chamfers form a funnel that leads into the guide groove. The chamfers create guide paths along which the guide element can be easily and reliably inserted into the guide groove. In the simplest case, the chamfers are formed as bevels. However, it is also conceivable that the chamfers are formed as curved guide paths. Alternatively, the guide groove could be funnel-shaped overall.

[0062] In one specific embodiment, the guide element has a diameter of 8 mm and the recess, which is designed as a guide groove with a slotted shape open on one side, has a width of 9 mm.

[0063] It is also conceivable that the recess on the retaining sleeve is designed like a bayonet fitting. This provides an additional means of securing the retaining sleeve to the fitting. Unintentional removal of the retaining sleeve from the fitting is impossible when the guide element engages in the bayonet-like recess, even if the locking element has not yet been inserted into the corresponding locking recess.

[0064] In a further advantageous embodiment, the fitting can be formed in one piece, wherein the fitting can be designed as a sleeve with a stepped outer profile, which has at least one locking recess. It is conceivable that the sleeve is designed as a cuboid or cylindrical sleeve. Depending on the design, the retaining sleeve can also have a cuboid or cylindrical shape. The fitting can thus be at least partially inserted into and positioned within the retaining sleeve. However, this is not to be understood as a limitation. The fitting can also have a pin shaft shape, which can be inserted into a retaining sleeve designed congruently with the pin shaft shape.

[0065] The fitting can be at least partially inserted concentrically into the retaining sleeve to move it into the operating position. In the operating position, the fitting is at least partially positioned within the retaining sleeve and fixed within the retaining sleeve by means of at least one locking element.

[0066] The locking recess is advantageously designed as a circumferential rectangular groove or as an annular groove. In the operating position, the locking element engages in this locking recess. It presses against the locking recess, thus securing the fitting in the retaining sleeve. The sleeve, with its stepped outer profile, is pressed against the interior of the retaining sleeve. Due to the stepped profile, it advantageously forms a three-point load together with the locking element in the locking recess. This allows tilting and torque forces to be absorbed particularly effectively. The connection between the retaining sleeve and the fitting is therefore particularly stable and resistant to external loads.

[0067] Furthermore, it is conceivable that the sleeve has a shoulder at its free end, the end furthest from the handle, which has a larger outer circumference than the locking recess. This shoulder forms a kind of retaining ring. On the one hand, it creates a contact point within the retaining sleeve; on the other hand, it allows the fitting, in the form of the sleeve, to be inserted straight and securely into the retaining sleeve. Additionally, the shoulder prevents the fitting from being completely pulled out of the retaining sleeve in the operating position if the locking element is unintentionally released. In this position, the fitting and retaining sleeve have some play, which the user can detect early on. This allows the user to tighten the locking element again before they completely separate. The shoulder prevents the fitting from being completely pulled out of the retaining sleeve.This prevents the retaining sleeve from falling off the fitting. This also prevents tool heads, which are connected to the fitting and thus also to the handle element via the retaining sleeve, from being unintentionally lost during use.

[0068] The sleeve advantageously features an additional shoulder located at the free end facing the handle. The outer diameter of this shoulder is larger than the inner diameter of the retaining sleeve. Thus, when inserted into the retaining sleeve, the shoulder of the sleeve abuts the sleeve, limiting its insertion to a certain point. In the operating position, this shoulder abuts the retaining sleeve. This also advantageously aligns the locking recess with the locking element, allowing it to be tightened after the fitting is inserted into the retaining sleeve, engaging the corresponding locking recess as intended. This ensures particularly simple and intuitive handling. The fitting, in the form of the sleeve, and the retaining sleeve can be easily moved into the operating position and aligned with each other.

[0069] In this embodiment, the fitting, in the form of a sleeve, can be attached to a handle element, such as a handle. It is fastened to the handle element by a fastener, which can advantageously be a screw. The screw is inserted through a hole in the sleeve and into the handle element.

[0070] When the fitting, in the form of a sleeve, is slid onto and secured to a handle element, such as a wooden handle, it simultaneously forms reinforcement for the handle element. It protects the free end of the handle element, which is located inside the sleeve. This protects the free end of the handle element from moisture and / or impacts.

[0071] Furthermore, a pluggable tool with a pluggable connecting element, comprising at least a tool head and a handle element, wherein the tool head and the handle element are detachably connected to each other by the pluggable connecting element, is described.

[0072] This allows different tool heads to be arranged on different handle elements. The ability to easily replace the tool heads as needed is particularly advantageous. Furthermore, it is also beneficial that the individual components can be stored disassembled when not in use. This is especially useful for rescue workers who need to carry the tool in a rescue or emergency vehicle. For example, if the handle elements are designed as a shaft, they can be stored very compactly without the tool heads. At the same time, the tool heads can be conveniently stored separately in boxes or similar containers. This is particularly advantageous if the tool heads are dirty or wet from previous use, preventing damage to surrounding tools. For example,Broom heads, after being used to sweep up battery acid, should be safely stored in a box and do not need to be left loose in the rescue or emergency vehicle. The same applies, for example, to shovels, which may be heavily soiled.

[0073] Furthermore, the disassembled tool can be more easily loaded onto the rescue or emergency vehicle. Optimal loading is crucial for rescue or emergency vehicles. The space-saving arrangement of the tool components within the vehicle ensures optimal weight distribution of the equipment carried.

[0074] Furthermore, handle elements in the form of long handles, for example, can be easily lifted and moved, since the weight of a tool head is eliminated when the tool is disassembled. This allows a handle element to be easily gripped and lifted even at the outer end, the end opposite the fitting.

[0075] Furthermore, the fitting on the handle element does not prevent it from being pulled out, even when the handle elements are stored close together, whether lying down or standing upright. Locking elements, such as locking devices, are located on the retaining sleeves on the tool heads. This prevents the handle elements from jamming against each other.

[0076] In another advantageous embodiment, the interlocking tool can be made of metal, particularly advantageously of a rust-resistant metal such as stainless steel. This makes it especially robust and also temperature-resistant. The interlocking tool can also be made, at least partially, of a spark-free or non-sparking metal. Such spark-free or non-sparking metals are particularly advantageous for use in explosive atmospheres and consist of highly wear-resistant non-ferrous alloys such as special bronze or copper-beryllium. However, this is not to be understood as a limitation. It is also conceivable that the interlocking tool could be made of plastic, wood, or a composite material such as carbon fiber or glass-fiber-reinforced plastic. Combinations of different materials are also possible.The choice of materials depends on the intended application of the interlocking tool. It is also conceivable that the interlocking tool is at least partially coated with a corrosion protection layer. Such a corrosion protection layer can be galvanizing, painting, powder coating, or a plastic coating.

[0077] It is also conceivable that the pluggable connecting element is designed as a retrofit module for tools. This would allow existing tools to be equipped with such a pluggable connecting element, enabling different tool heads to be attached to a single handle. Conversely, it is also conceivable that different handle elements could be attached to a single tool head. For example, depending on the application, a straight or an ergonomically shaped, curved handle could be attached to a shovel.

[0078] In the event of a component failure, it is also advantageous that it can be replaced easily and quickly. For example, if a handle breaks, it can simply be replaced with a new handle and a suitable fitting.

[0079] Both the fittings and the retaining sleeves can be advantageously manufactured in large quantities. Simple geometries facilitate the production of the plug-in connecting element or plug-in tool described here.

[0080] Furthermore, the use of a modular tool with a modular connecting element as a manually operated tool using muscle power is described for fire departments, technical relief organizations, the military, and / or rescue organizations. Such a tool can be in the form of a shovel, rake, scraper, hook, scraper, fire beater, broom, squeegee, spade, pitchfork, karst, push rake, snow shovel, and / or claw. This list is, of course, not exhaustive. Modular tools with a modular connecting element can also be used, for example, as pickaxes, axes, pruning shears, saws, etc.

[0081] Finally, the use of a plug-in connector as a retrofit module or tool connector for a plug-in tool is described. It is conceivable that existing tools can be upgraded and retrofitted with the connector described here. A wide variety of tools can thus be connected to one another. For this purpose, the retaining sleeve must first be attached to the tool head. This can be done, for example, by a screw or weld connection, depending on whether the tool head is made of wood or metal. Rivet or adhesive connections are also possible. Furthermore, the fitting can be easily and quickly attached to a handle element, such as a wooden handle. This makes it advantageously possible to quickly and easily transform a conventional tool into a plug-in tool using a plug-in connector.

[0082] Further advantages, features and design possibilities will result from the following description of figures illustrating exemplary embodiments, which are not to be understood as restrictive. Brief description of the drawings

[0083] The drawings show: Fig. 1 Side sectional view of a first embodiment of a pluggable connecting element, Fig. 2 Perspective view of the first embodiment of a pluggable connecting element, Fig. 3 Side sectional view of a second embodiment of a pluggable connecting element, Fig. 4 Perspective view of the second embodiment of a pluggable connecting element.

[0084] In the drawings, elements designated with the same reference numerals are essentially equivalent to one another, unless otherwise indicated. Furthermore, components that are not essential for understanding the technical teaching disclosed herein are not shown or described. Additionally, reference numerals are not repeated for all elements already introduced and illustrated, provided that the elements themselves and their function have already been described or are known to a person skilled in the art. Detailed description of exemplary implementations

[0085] In the Fig. Figure 1 shows a side sectional view of a first embodiment of a pluggable connecting element 1. On the right of the image is the outer end section of a handle element 4. This is the outer end of a stem with a tapered end. A fitting 5 is arranged at the outer end of the handle element 4. The fitting 5 has the form of a cylindrical sleeve with a stepped profile. It is fitted onto the outer end of the handle element 4 and fastened to the handle element 4 by means of a fastening element 6 in the form of a screw. The screw is inserted into the handle element 4 through a hole in the fitting 5.

[0086] The fitting 5, in the form of a cylindrical sleeve, has a shoulder that tapers towards the free end. The tapered section has a smaller outer diameter than the section into which the handle element 4 is inserted. Furthermore, the fitting 5 also has a rectangular groove in the tapered section. This groove forms a locking recess 9.

[0087] The fitting is arranged within a retaining sleeve 7. The retaining sleeve 7 and the fitting 5 are arranged concentrically to each other. The shoulder of the fitting 5 abuts one end of the retaining sleeve 7, preventing the fitting 5 from being inserted further into the retaining sleeve 7. This also ensures that the fitting 5 is optimally aligned in its operating position.

[0088] A locking element 8 in the form of a locking screw is arranged on the outer circumference of the retaining sleeve 7. It engages in an internal thread located on the wall of the retaining sleeve 7. The locking screw passes through the wall of the retaining sleeve 7 and simultaneously engages in the locking recess 9 on the fitting 5. The locking screw thus presses the fitting 5 against the interior of the retaining sleeve 7, thereby fixing the fitting 5 within the retaining sleeve 7. The locking screw and the locking recess form a common contact surface. Opposite this, the areas to the right and left of the locking recess form contact surfaces between the fitting 5 and the inner wall of the retaining sleeve 7. This creates at least three contact points or surfaces. This arrangement thus forms a three-point load, which is particularly advantageous for effectively absorbing tilting and bending moments.The connection between the retaining sleeve 7 and the fitting 5 is therefore particularly stable. Tilting, wobbling, twisting, or slipping of the fitting 5 within the retaining sleeve 7 is thus prevented in the operating position.

[0089] A tool head 2 is arranged at the end of the retaining sleeve 7 that faces away from the stop of the fitting 5. This is shown here only schematically and in part. In the illustrated embodiment, the retaining sleeve 7 has a tab. This tab can be formed integrally with the retaining sleeve 7. However, it is also conceivable that it is welded to the retaining sleeve. This is not to be understood as a limitation; for example, the tab could also be screwed or riveted to the retaining sleeve 7.

[0090] The tab, in turn, is connected to the tool head 2. In the illustrated embodiment, the connection is a screw connection. However, it is also conceivable that the connection could be a clamping, welding, riveting, or adhesive connection. It is also conceivable that the tab is formed integrally with the tool head 2.

[0091] The retaining sleeve 7 is open on both sides. This prevents dirt and liquids from accumulating inside the retaining sleeve 7 and damaging it. If, for example, dirt is present inside the retaining sleeve 7, it is simply pushed out when the fitting 5 is inserted into the operating position. Water or other liquids can drain away quickly and easily and do not collect in grooves or similar features.

[0092] In the Fig. Figure 2 shows a perspective view of the first embodiment of a pluggable connecting element 1, wherein the pluggable connecting element 1 is shown as an exploded view. The pluggable connecting element 1 corresponds to the one from Fig. 1.

[0093] All components shown form a pluggable tool 3, in which the handle element 4, in the form of a shaft, is detachably connected to a tool head 2 via a pluggable connecting element 1. To connect it to the working position, the fitting 5 is inserted into the retaining sleeve 7 until it stops and secured with the locking element 8 by screwing it in. The connection thus formed is particularly stable and durable and ideally suited for demanding applications such as rescue operations or technical assistance by the fire department or the Federal Agency for Technical Relief (THW).

[0094] In Fig. Figure 3 shows a side sectional view of a second embodiment of a pluggable connecting element 1. A portion of a handle element 4 in the form of a stem is shown in the center. The stem tapers slightly towards the free end shown.

[0095] A retaining ring 12 is arranged at the conical end of the handle. It simultaneously forms a reinforcement. A fitting 5 is also arranged in the conical area of ​​the handle. The fitting 5 has a base body in the form of a key 10. The key 10 is inserted into a corresponding recess in the handle. It forms a flush surface with the grip element 4. Furthermore, the key 10 is fastened to the handle by fasteners 6 in the form of screws, which are screwed to the handle through holes in the key 10. In the case of a wooden handle, the screws are advantageously wood screws.

[0096] A guide element 11 in the form of a nipple extends perpendicularly from the surface of the key 10 away from the handle element 4. In the illustrated embodiment, the guide element 11 and the key 10 are formed as a single piece. However, it is also conceivable that they are connected to each other as separate components. For example, they could be welded together.

[0097] Handle element 4 and fitting 5 are inserted into a retaining sleeve 4. The handle element 4 and fitting 5 are arranged concentrically with respect to the retaining sleeve 7. The retaining sleeve 7 is open at both ends, allowing dirt and liquids to be easily removed or drain away. In the arrangement shown, the components of the pluggable connecting element 1 are in their operating position.

[0098] A locking element 8 in the form of a locking screw is arranged on the outer circumference of the retaining sleeve 7. It is screwed into a thread on the outer wall of the retaining sleeve 7. It protrudes through the wall of the retaining sleeve 7 and engages in a locking recess 9 in the keyway 10. The locking recess 9 is designed as a partially conical bore. The locking screw, which engages in the conical bore, has a corresponding chamfer at its outer end. This increases the contact area between the locking element 8 and the locking recess 9, which in turn increases the frictional engagement at the contact surface. As a result, the locking screw has a higher self-locking effect. Unintentional loosening during use is effectively prevented. At the same time, the conical bore of the locking recess 9 ensures that the fitting 5 is centered and thus precisely aligned when the locking screw is tightened.Thus, by screwing in the locking screw, the same operating position is always achieved.

[0099] The diameter of the conical bore is smaller than the width of the key. This leaves material from the key forming a wall around the conical bore, which provides added stability. When force is applied to the bore by the locking element 8, the wall around the conical bore prevents the key from deflecting. The conical bore has a depth that is less than the thickness of the key. Advantageously, the depth of the conical bore is at most half the thickness of the key.

[0100] When the locking screw presses against the fitting 5 in the operating position, the fitting, together with the handle element 4, is pressed against the inside of the retaining sleeve 7. This creates a total of three contact points: the contact surface between the retaining ring 12 and the retaining sleeve 7, the contact surface between the locking element 8 and the locking recess 9, and the contact surface between the handle element 4 and the retaining sleeve 7. This three-point load is very stable and can reliably absorb tilting and torque forces. This creates a particularly stable connection between the fitting 5 with the handle element 4 and the retaining sleeve 7. This connection is also particularly impact-resistant. The three-point load prevents the handle element 4 from tilting within the retaining sleeve 7. This also effectively prevents the locking element 8 from loosening on its own during use.

[0101] In its operating position, the guide element 11 engages in a corresponding recess in the retaining sleeve 7. This allows the fitting 5 to be inserted into the retaining sleeve 7 in a rotationally secure manner. Simultaneously, the recess in the retaining sleeve 7 forms a stop for the guide element 11. This prevents the fitting 5 from being inserted into the retaining sleeve 7 to a certain point, thus preventing it from being inserted too deeply. At the same time, this ensures that the fitting 5 is in its preferred operating position relative to the retaining sleeve 7 when the guide element 11 engages. Advantageously, in this position, the locking recess 9 is aligned with the locking element 8.

[0102] In the Fig. Figure 4 shows a perspective view of the second embodiment of a pluggable connecting element 1, with the pluggable connecting element 1 being shown as an exploded view. The pluggable connecting element 1 corresponds to the one from Fig. 3.

[0103] All components shown form a pluggable tool 3, in which the handle element 4, in the form of a shaft, is detachably connected to a tool head 2 via a pluggable connecting element 1. To connect it to the working position, the fitting 5 is inserted into the retaining sleeve 7 until the guide element 11 stops against the recess in the retaining sleeve 7 and is secured with the locking element 8 by screwing it in. The connection thus formed is particularly stable and durable and ideally suited for demanding applications, such as rescue operations by the fire department or the Federal Agency for Technical Relief (THW).

[0104] The retaining sleeve 7 is rigidly connected to a tool head 2. In the illustrated embodiment, the retaining sleeve 7 is welded to the tool head 2. However, it is also conceivable that the retaining sleeve 7 is screwed, riveted, glued, or similarly bonded to the tool head 2. Furthermore, it is also conceivable that the retaining sleeve 7 and the tool head 2 are formed as a single piece.

[0105] When mounting the fitting 5 to the handle element 4, the key 10 is first inserted into the corresponding recess on the handle element 4 and secured with the fastening elements 6. Then, the retaining ring 12 is slid onto the outer end of the handle element 4 so that the retaining ring 12 partially covers the key 10 at one end. In this position, the retaining ring 12 is welded to the key 10. This causes the key 10 and retaining ring 12 to lock against each other and prevent them from being removed from the handle element 4. This provides additional security for the fitting on the handle element 4.

[0106] Although the invention has been further illustrated and described in detail by the advantageous embodiments, the invention is not limited by the disclosed examples. Other variations can be derived by a person skilled in the art without departing from the scope of protection of the invention. In particular, the invention is not limited to the combinations of features specified below, but other combinations and partial combinations of the disclosed features that are obviously executable by a person skilled in the art can also be formed. List of reference symbols 1 connecting element 2 Tool head 3 tools 4 handle elements 5 fittings 6 Fasteners 7 Retaining sleeve 8 Locking element 9 Locking recess 10 Keyway 11 Guide element 12 retaining ring

Claims

[1] Pluggable connecting element for tools, at least comprising a fitting (5) with at least one fastening means (6) for fastening to a handle element (4) and at least one holding sleeve (7) with at least one locking element (8), wherein the holding sleeve (7) is designed as a hollow cylinder and is open on both sides and wherein the fitting (5) is at least partially cylindrical and, in a use position, is at least partially pushed into the holding sleeve (7) and is releasably fixed to the holding sleeve (7) by means of the at least one locking element (8), wherein the outer diameter of the fitting (5) is 92-96% of the inner diameter of the holding sleeve (7). [2] Pluggable connecting element according to claim 1, characterized bythat the at least one locking element (8) can be screwed into the holding sleeve (8) into an internal thread arranged on the outer circumference of the holding sleeve (7), wherein the screw axis of the internal thread is aligned perpendicular to the longitudinal axis of the longitudinal extension of the holding sleeve (8). [3] Pluggable connecting element according to claim 1, characterized by that the fitting (5) is designed in several parts, wherein the fitting (5) has at least one feather key (10) with a locking recess (9), at least one guide element (11) and at least one retaining ring (12). [4] Pluggable connecting element according to claim 3, characterized by that the at least one guide element (11) and / or the at least one retaining ring (12) is integrally connected to the at least one feather key (10). [5] Pluggable connecting element according to claim 3, characterized bythat the locking recess (9) is designed as an at least partially conical bore into which the at least one locking element (8) can be inserted at least partially in a form-fitting manner. [6] Pluggable connecting element according to claims 1 and 3, characterized by that the holding sleeve (7) has at least one recess for the rotationally secure reception of the at least one guide element (11), wherein the at least one recess is formed congruent to the at least one guide element (11). [7] Pluggable connecting element according to claim 1, characterized by that the fitting (5) is formed in one piece, wherein the fitting (5) is designed as a sleeve with a stepped outer profile, which has at least one locking recess (9). [8] Pluggable tool with a pluggable connecting element (1) according to at least one of claims 1-7, at least comprising a tool head (2) and a handle element (4), wherein the tool head (2) and the handle element (4) are detachably connected to one another by the pluggable connecting element (1). [9] Use of a pluggable tool according to claim 8 with a pluggable connecting element (1) according to at least one of claims 1-8 as a tool which can be used manually with muscle power in the form of a shovel, a rake, a pusher, a hook, a fire beater, a broom, a shovel, a spade, a fork, a hoe, a snow shovel and / or a claw for fire brigades, technical relief organisations, the military and / or rescue organisations. [10] Use of a pluggable connecting element according to at least one of claims 1-7 as a retrofit module or tool connector for a pluggable tool according to claim 8.

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