EP2750836B1 - Handle device - Google Patents
Handle device Download PDFInfo
- Publication number
- EP2750836B1 EP2750836B1 EP12790435.7A EP12790435A EP2750836B1 EP 2750836 B1 EP2750836 B1 EP 2750836B1 EP 12790435 A EP12790435 A EP 12790435A EP 2750836 B1 EP2750836 B1 EP 2750836B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring element
- handle device
- handle
- screw
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/04—Handles; Handle mountings
- B25D17/043—Handles resiliently mounted relative to the hammer housing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/54—Plastics
- B25D2222/57—Elastomers, e.g. rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/54—Plastics
- B25D2222/69—Foamed polymers, e.g. polyurethane foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/255—Switches
- B25D2250/261—Means for locking an operative switch on
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/255—Switches
- B25D2250/265—Trigger mechanism in handle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/275—Tools having at least two similar components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/371—Use of springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/371—Use of springs
- B25D2250/381—Leaf springs
Definitions
- the invention relates to a handle device for a hand tool according to the preamble of claim 1 and as from DE 10 2006 029 630 A1 known.
- Anti-vibration handles with an elastic connection to the hammer also cause relative movements between the hammer and the handle itself due to the required stiffness.
- the invention is based on a handle device for a hand-held power tool, which has an operating mode switchover device and a drive device for driving an insert tool in different operating modes, with at least one spring element and with a handle unit which is attached to a machine housing at least to a limited extent and which can be moved across the at least one spring element the machine housing is at least partially vibration-decoupled, and with at least one screw plate which is provided to fix the spring element in a positive and non-positive manner.
- the handle device according to the invention with the features of main claim 1 solves the problem in an easy to install and inexpensive manner. It fulfills all the requirements placed on it.
- the screw plate encloses a clamping area of the spring element in all spatial directions except for a contact zone with the handle unit. In particular, this enables a stable, high-quality, compact and inexpensive design and connection of the handle device to the hand-held power tool.
- the screw plate have at least one screw dome, which is provided for screwing the spring element to the handle unit.
- the handle device comprises a switch actuator for starting up the drive device, the switch actuator being able to be switched between two switching positions both mono-stably and bi-stably.
- “bi-stable” is to be understood in particular to mean that the switch actuator has two stable switching positions into which the switch actuator can be switched.
- the switch actuator is preferably formed as an on-off switch of the hand machine tool.
- the handle device comprises an intermediate plate which is provided in the machine housing and which at least receives the spring element on one side, and a control means via which the switch actuator interacts with the operating mode switchover device in such a way that in certain operating modes the switch actuator is not switched bi-stably can.
- “mono-stable” is to be understood in particular to mean that the switch actuator only has a stable switching position into which the switch actuator can be switched or into which the switch actuator preferably falls back automatically, while the switch actuator in at least one other switching position Operator in particular must be kept. As a result, an easy-to-assemble and inexpensive configuration of the handle device can be achieved.
- the control means be designed as a tension band.
- the drawstring can preferably be made of a plastic or another, a specialist be made as a material that appears reasonable.
- the drawstring preferably has an at least substantially rectangular cross section with an at least substantially circular-like, in particular circular, central fiber.
- the middle fastener it is also conceivable for the middle fastener to have an at least essentially quadrangular or hexagonal cross-section or another cross-section that appears reasonable to a person skilled in the art.
- the middle fiber is preferably provided to serve at least partially as a filling channel, in particular in a spraying process, and / or to form an advantageously narrow line of contact with the leaf spring. This enables an advantageously inexpensive configuration to be achieved.
- the at least one spring element is formed by a leaf spring. In this way, in particular a preferably inexpensive implementation and an advantageously simple assembly of the handle device can be achieved.
- the handle device has at least one secondary spring element which is formed by an elastomer spring element.
- the spring element formed by the leaf spring can advantageously be supported in a spring action and use of the handle device, in particular in larger and more powerful handheld power tools, can be achieved.
- the secondary spring element is only acted upon after a certain spring deflection. It is proposed that the spring stiffness of the spring element formed by the leaf spring be set so that with a spring deflection between 2 mm and 10 mm, preferably between 3 mm and 7 mm, particularly preferably between 4 mm and 5 mm, minimum operating pressure points for most important Use cases can be achieved. From this pressure threshold, the secondary spring element begins to act. The more the volume of the elastomer spring element is deformed during the deflection, the stiffer a characteristic curve of the secondary spring element.
- the volume compression of the elastomer spring element is designed in such a way that with an additional deflection of 2 mm to 5 mm, in particular 3 mm to 4 mm, beyond a minimal operating pressure point, the elastomer spring element is 70% of its initial volume is compressed. With a further compression of 1 mm to 2 mm, the entire volume of the elastomer spring element is applied, so that the spring stiffness increases relatively quickly. This has the advantage that in the event of a fall on the anti-vibration handle, a great deal of energy can be absorbed, so that the components which are subjected to impacts are less loaded.
- the screw plate be provided to receive the at least one secondary spring element.
- this enables a stable, high-quality, compact and inexpensive design and connection of the handle device to the hand-held power tool.
- Figure 1 shows a schematic view of a hammer drill and / or chisel hammer as an example of a handheld power tool 10 with a machine housing 20, a tool holder 54 movably arranged on the machine housing 20 for exchangeably receiving an insert tool 16 and with a drive device accommodated in the machine housing 20 and having a drive unit and a gear unit 14 for driving the insert tool 16 in different operating modes.
- the tool holder 54 is preferably rotatably arranged on an end face of the machine housing 20.
- the handle device comprises a switch actuator 24 for starting up the hammer drill and / or chisel hammer.
- the switch actuator 24 can be switched both mono-stable and bi-stable between two switching positions.
- an additional handle device 56 is arranged on the machine housing 20 of the hammer drill and / or chisel hammer, in particular is arranged to be adjustable.
- Handheld power tool 10 has an operating mode switchover device 12.
- an operating lever for an operating mode switchover is arranged on the machine housing 20, with which an operator can choose between different drive types for the insert tool 16 used in the tool holder 54.
- the handle device for the handheld power tool 10 comprises a spring element 18 and a handle unit 22, which is attached to the machine housing 20 so that it can move at least to a limited extent, which is vibration-decoupled from the machine housing 20 via the spring element 18 and comprises the switch actuator 24 for starting up the drive device 14.
- the handle unit 22 includes an anti-vibration handle 58.
- the handheld power tool device also has a Control means 28 via which the switch actuator 24 interacts with the operating mode switchover device 12 in such a way that the switch actuator 24 cannot be switched bi-stably in certain operating modes.
- the control means 28 is designed as a tension band 30.
- the assembly shown is composed of the following functional units: an intermediate plate 26, the spring element 18 and a slide switch assembly.
- the intermediate plate 26 is the central component of this assembly. Their construction enables a number of possibilities for the simple implementation of existing functions in the hand-held power tool 10 formed by the hammer when the anti-vibration handle 58 is used and a mechanical switch actuation with changeover.
- One of the central tasks of the intermediate plate 26 is to accommodate and guide the spring element 18, as in FIGS Figures 3a and 3b shown.
- the spring element 18 is clamped into the anti-vibration handle 58 by the intermediate plate 26 and fixed at the clamping point via a contour.
- the contour is preferably realized in a contact surface on the intermediate plate 26 on which the spring element 18 can be supported.
- the curve of this contour determines the rigidity, bending line and paths of the spring element 18.
- the spring element 18 is designed as a leaf spring 32.
- the intermediate plate 26 serves to receive or as a stop for one or more secondary spring elements 34, 34 ', 34 ", which can serve as damping elements Figures 4a to 4c Possible variants and configurations of the secondary spring elements 34, 34 ', 34 "are shown Figures 4a to 4c Bags with support ribs 60 and a frame 62 additionally for introducing damping elements into the intermediate plate 26.
- the secondary spring elements 34, 34 ', 34 " can preferably be made of foam, a cellular rubber, a foam rubber, another synthetic or natural foam, elastomer, TPE , Rubber, a gel or a similar elastic material
- the degree of damping or suspension can additionally be adjusted via the volume of individual chambers, and the frame 62 prevents jamming with other surrounding components.
- Suspension and damping are consequently adjusted to one another centrally via the accommodation of the spring element 18 and the secondary spring elements 34, 34 ', 34 "in the intermediate plate 26.
- the result is the compact assembly which is provided for preassembly and which contains all the essential components for the operative connection of the decoupling united with each other.
- the principle facilitates the coordination of the components for decoupling and, moreover, opens up the possibility of deriving a rigid handle of the handle unit 22 without switching over by simply omitting the assembly.
- the special design of the intermediate plate 26 also enables improved guidance of the handheld power tool 10 and in particular an improved transmission of operating forces on the anti-vibration handle 58 to the machine housing 20 of the handheld power tool 10 Figure 5
- support points and receptacles of the intermediate plate 26 are designed in the upper area of a handle housing 64 and at the connection to the drive device 14 comprising a motor assembly so that 58 operating forces can be transmitted unfiltered or unsprung to the handheld power tool 10 along the force flow from the anti-vibration handle. This results in good user guidance for the handheld power tool 10.
- the intermediate plate 26 is provided in the machine housing 20 and receives the spring element 18 on one side. Finally, the slide valve assembly is accommodated in the intermediate plate 26.
- the slide valve assembly consists according to the Figures 6a to 6c consisting of a slide switch 66, the tension band 30 and a compensation spring 68. In addition to the intermediate plate 26, it forms a further important unit especially for the transmission of switching or switching paths to the switch actuator 24.
- the control means 28 designed as a tension band 30 is made of plastic.
- the z-shaped, cranked slide switch 66 can be pushed into the intermediate plate 26 with a simple sliding movement and locked in place in the intended installation position by means of a snap hook connection (not shown). It is also conceivable that the z-shaped, cranked slide switch 66 can be rotated into the intermediate plate 26 with a simple pivoting movement.
- the aspect ratio The guide surfaces with each other ensure sufficient pre-centering during the entire pre-assembly. This prevents incorrect assembly.
- the material and geometry are decisive for the design of the tension band 30.
- plastic offers a wide range of variations to combine low friction values with good emergency running properties and low susceptibility to dust. Therefore, a plastic is essential for this application a very suitable material.
- a band cross section of the tension band 30 must run very flat in height and therefore long in width.
- a rectangular cross-section with an aspect ratio of 1:10 was combined with an essentially circular-like, in particular circular, central fiber (see Figures 7a to 7c ), but cross sections with rounded corners and / or different aspect ratios, in particular in the range between 1: 2 to 1:20, particularly preferably from 1: 5 to 1:15, can also be advantageous.
- the variation of the surface proportions also helps between stiffness and flexibility.
- the essentially circular-like, in particular circular, portion serves to fill the mold in the manufacturing process and at the same time advantageously increases the strength.
- the installation situation in the slide switch 66 creates a buffer which can compensate for all blurring from the production and mechanical behavior of the tension band 30, which is made of plastic.
- the tension band 30 must have a body for receiving the compensation spring 68 and must be securely received / guided in the slide switch 66 with the aid of two rotary receptacles.
- the slide switch 66 supports the compensation spring 68 on the opposite side and determines the measure for the compensation over the installation length.
- a labyrinth 70 is further provided over the intermediate plate 26, which reaches inwards to cover the machine housing 20 comprising a striking mechanism housing and a housing cover, the drive device 14 comprising a motor assembly and the anti-vibration handle 58 (see Figure 9 ).
- the labyrinth 70 reaches into the surrounding parts at the transitions and provides effective dust protection and safe operation, especially when the switch actuator 24 formed by the hammer switch is switched over. Additional sealing elements are therefore not required.
- Another aspect of the invention relates to the fact that in the case of larger and more powerful handheld power tools 10, e.g. in the case of heavy hammer drills and chisels, the above-described fixing of the leaf spring 32 between the anti-vibration handle 58 and the machine housing 20 is no longer sufficient.
- the leaf spring 32 is no longer sufficient as the sole spring element.
- Additional secondary spring elements 34 must also be inserted between the machine housing 20 and the leaf spring 32 in order to support the spring force of the too soft leaf spring 32.
- the secondary spring elements 34 are each formed by an elastomer spring element 36.
- the leaf spring can only be functionally or applied with force by a clamping piece and the screw plate on the back. No holding or fixing functions or forces can be initiated on the side of the leaf spring facing the device side.
- the invention thus represents an extension of that from the publication DE 10 2006 029 630 A1 known solution, in order to be able to implement the anti-vibration handle concept presented there also with larger and more powerful hand-held machine tools.
- the anti-vibration handle 58 held by the operator contains the switch actuator 24 designed as an on-off switch and is closed off by screwing a grip shell of the anti-vibration handle 58 towards the rear.
- the leaf spring 32 is clamped at the top between the anti-vibration handle 58 and two screw plates 48.
- the two screw plates 48 are pushed onto the leaf spring 32 on both sides in the transverse direction.
- the screw plates 48 thus enclose an upper clamping area 50 of the leaf spring 32 except for the contact zone to the anti-vibration handle 58 in all spatial directions. This ensures a permanent and stable enclosure of the leaf spring 32.
- Screw domes 52 are located in the screw plates 48, which serve to screw the screw plates 48 and thus one of the leaf springs 32 to the anti-vibration handle 58.
- the screw plates 48, the leaf spring 32, the anti-vibration handle 58 and a tensioned bellows 72 form a fastening system which is advantageously held together by positive and non-positive engagement.
- the positive connection is formed by mutually supporting and penetrating holding domes and ribs, so that the positive connection has only a fixing function and the essential forces are absorbed by the positive connection of the components.
- a major advantage of the screw plates 48 pushed on both sides is the creation of additional functional surfaces in front of an area and to the side of an area of the screw plates 48 of the leaf spring 32.
- the screw plates 48 are designed such that they accommodate the additional secondary spring elements 34. In addition to spring mounts, the screw plates 48 also have additional functions. In order to prevent the anti-vibration handle 58 from being torn out and thus also to prevent the leaf spring 32 from being overloaded, the screw plates 48 have lateral contact surfaces which are supported on the back on two rear plates 38 designed as housing rear plates. As a result, the anti-vibration handle 58 has a stable and defined rear stop.
- a further function of the screw plates 48 is the lateral guiding and the covering of the control means 28 formed by the tension band 30 compared to the secondary spring element 34 formed from an elastomer the switch actuator 24 formed on the on-off switch is blocked during chiseling so that the operator does not have to continuously press the switch actuator 24.
- the drawstring 30 must be able to slide smoothly on the leaf spring 32 and must not be jammed or jammed.
- the tension band 30 is chambered in a shaft of the screw plates 48.
- the bellows 72 is also chambered by the screw plates 48 in the anti-vibration handle 58.
- the screw plates 48 also form the end stop in the longitudinal and vertical directions of the anti-vibration handle 58.
- the lower leaf spring clamp has advantageously been integrated into the screw connection system of the back plates 38 to the machine housing 20 (see Figures 14a and 14b ).
- the formerly one-piece back plate was divided into two mirror-symmetrical back plates 38 in order to be able to fulfill all the required functions, inexpensive assembly and tool formability.
- a spring plate 40 is inserted at the top with its two retaining ribs 42 into two corresponding holding grooves 44 of the rear plates 38 designed as housing rear plates and then folded back towards the rear plates 38 against a leaf spring tension ,
- two snap hooks 46 are integrated in the rear plates 38, which snap into the spring plate 40 and hold it in the assembly position.
- the complete preassembled handle device designed as a handle assembly can then be applied to the core device in an assembly line.
- both non-positive and positive elements are used to clamp the leaf spring 32.
- the leaf spring 32 has at its lower end two openings and a fold 74.
- the leaf spring 32, the spring plate 40 and the machine housing 20 are on two domes on the respective side of the Back plates 38 threaded back plates formed.
- the spring plate 40 also encompasses the two screw domes of the machine housing 20.
- the fold 74 of the leaf spring 32 is clamped between the rear plates 38 and the spring plate 40.
- the height of the spring plate 40 is designed in such a way that the leaf spring 32 is firmly clamped at the bottom over approximately 25% of its length. The remaining length can freely cantilever when compressed.
- Another aspect of the invention is the combination of the leaf spring 32 as the primary spring element and the at least one further secondary spring element 34, which is however only acted upon after a certain spring deflection.
- Figure 15 shows a cross section through the upper region of the anti-vibration handle 58 with the leaf spring 32 and the secondary spring element 34.
- the screw plates 48, with which the leaf spring 32 is enclosed, are designed to the front in such a way that they still take up one or the additional secondary spring elements 34.
- a foamed molded elastomer part is introduced between the screw plate 48 or the leaf spring 32 and the spring plate 40.
- the elastomer molded part is designed as the elastomer spring element 36 and forms the secondary spring element 34.
- Foamed elastomer molded parts have the advantage of cost-effective production through a continuous extrusion process with subsequent cutting to the required length. Furthermore, they work in almost all spatial directions, i.e. they have no preferred direction, e.g. a helical compression spring.
- the advantageous secondary spring element 34 which is designed as an elastomer spring element 36, supports the leaf spring 32 under loads which lie above an optimal operating pressure point.
- the optimal operating pressure point is the minimum pressure that just has to be provided by the operator so that the handheld power tool 10 formed by the hammer drill performs a regular and clean impact operation. This operating pressure is dependent on the performance class of the handheld power tool 10 and on the respective application.
- an at least two-stage spring characteristic is generated. Up to the operating contact point, only the leaf spring 32 acts, so that very good decoupling of the anti-vibration handle 58 can be achieved with a low vibration level. A good decoupling is achieved in this area primarily because the leaf spring 32 has a very low damping constant. If the hand-held power tool 10 is overpressed or falls onto the anti-vibration handle 58, the elastomer spring element 36 then absorbs the essential part of the loads.
- the spring stiffness of the leaf spring 32 be set such that the minimum operating pressure points for most important applications are achieved with a spring deflection between 2 mm and 10 mm, preferably between 3 mm and 7 mm, particularly preferably between 4 mm and 5 mm , From this pressure threshold, the secondary spring element 34 begins to act. The more the volume of the elastomer spring element 36 is deformed during the deflection, the stiffer the characteristic curve of the secondary spring element 34. It is therefore further proposed that volume compression of the elastomer spring element 36 be designed such that with an additional deflection of 2 mm to 5 mm, In particular from 3 mm to 4 mm beyond the minimum operating pressure point, the elastomer spring element 36 is compressed to 70% of its initial volume.
- the elastomer spring element 36 is preferably made of foamed elastomer (foam rubber), which is produced in a continuous extrusion process with subsequent cutting to length.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
Die Erfindung betrifft eine Handgriffvorrichtung für eine Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1 und wie aus
Durch Inkrafttreten gesetzlicher Forderungen, die eine Begrenzung des Vibrationsverhalten an handgeführten Elektrowerkzeugen beinhalten, findet in der Branche dieses Thema eine immer größer werdende Bedeutung. Gerade bei schweren Bohr- und Schlaghämmern ist aufgrund der hohen Einzelschlagstärke ein Vibrieren sehr ausgeprägt. Durch Norm bzw. Gesetz wird nun festgeschrieben, wie lange der Anwender abhängig vom Vibrationsniveau der Maschine fortwährend damit arbeiten darf. Übersteigt die Belastung aus der Vibration festgelegte Grenzwerte, wird die zulässige Nutzungsdauer pro Tag entsprechend reduziert.With the entry into force of legal requirements that include a limitation of the vibration behavior of hand-held power tools, this topic is becoming increasingly important in the industry. With heavy rotary and impact hammers, vibration is very pronounced due to the high individual impact strength. The standard or law now specifies how long the user can work with it depending on the vibration level of the machine. If the exposure due to vibration exceeds the specified limit values, the permissible period of use per day is reduced accordingly.
Infolgedessen wird bei der Produktentwicklung zunehmend an Maßnahmen zur Vibrationsreduktion gearbeitet. Primärziel ist, den Bedienkomfort weiter zu steigern und ein praxisgerechtes Maß für die damit verbundene Nutzungsdauer pro Tag aufrechtzuerhalten. Zur Senkung von Vibrationen in Hämmern wird meist ein Teil der Maschinenbewegung direkt über Handgriffe für einen Bediener entkoppelt. Bei der Art der Entkopplung bedient sich der Markt grundlegend unterschiedlicher Konzepte. Neben einem Doppelschalengehäuse ist die meistverbreitete Methode ein Handgriff mit elastischer Anbindung zum Hammer, um die auftretenden Schwingungen über Federung und Dämpfung vom Bediener zu entkoppeln.As a result, measures to reduce vibrations are increasingly being worked on in product development. The primary goal is to further increase the ease of use and to maintain a practical measure of the associated service life per day. To reduce vibrations in hammers, part of the machine movement is usually decoupled directly for an operator using handles. The market uses fundamentally different concepts for the type of decoupling. In addition to a double-shell housing, the most common method is a handle with an elastic connection to the hammer in order to decouple the vibrations that occur from the operator via suspension and damping.
Antivibrationshandgriffe mit elastischer Anbindung am Hammer bewirken aufgrund der erforderlichen Steifigkeiten als Nebeneffekt auch Relativbewegungen zwischen Hammer und Handgriff selbst.Anti-vibration handles with an elastic connection to the hammer also cause relative movements between the hammer and the handle itself due to the required stiffness.
Daraus lassen sich Anforderungen für die Schnittstelle zwischen einem Hammer und einem Antivibrationshandgriff neu ableiten:
- □ Der Antivibrationshandgriff muss trotz seiner elastischen Anbindung zur Entkopplung weiterhin eine präzise Führung der Handwerkzeugmaschine ermöglichen.
- □ Anbindung und Führung des Antivibrationshandgriffs sollten den Hammer in seiner Größe/Länge ergonomisch nicht beeinflussen.
- □ Bei der Auslegung der im Antivibrationshandgriff innen liegenden Teile ist die zusätzliche Bewegung aus der Entkopplung von der Handwerkzeugmaschine zu berücksichtigen.
- □ Staubschutz muss sichergestellt werden.
- □ Die Umschaltung vom Hammerschalter in Abhängigkeit von einer Betriebsart des Hammers, insbesondere die Umschaltung der Schalterfunktion und die Arretierbarkeit des Hammerschalters, soll weiterhin erhalten bleiben.
- □ Despite its elastic connection for decoupling, the anti-vibration handle must still enable precise guidance of the hand tool.
- □ Connection and guidance of the anti-vibration handle should not ergonomically influence the size / length of the hammer.
- □ When designing the parts inside the anti-vibration handle, the additional movement from the decoupling from the hand tool must be taken into account.
- □ Dust protection must be ensured.
- □ The switchover from the hammer switch depending on the operating mode of the hammer, in particular the switchover of the switch function and the lockability of the hammer switch, should be retained.
Die Erfindung geht aus von einer Handgriffvorrichtung für eine Handwerkzeugmaschine, die eine Betriebsartenumschaltvorrichtung und eine Antriebsvorrichtung zum Antrieb eines Einsatzwerkzeugs in unterschiedlichen Betriebsarten, aufweist, mit zumindest einem Federelement und mit einer an einem Maschinengehäuse zumindest begrenzt beweglich angebrachten Handgriffeinheit, welche über das zumindest eine Federelement gegenüber dem Maschinengehäuse zumindest teilweise schwingungsentkoppelt ist, und mit zumindest einer Schraubplatte, die dazu vorgesehen ist, das Federelement form- und kraftschlüssig zu fixieren.The invention is based on a handle device for a hand-held power tool, which has an operating mode switchover device and a drive device for driving an insert tool in different operating modes, with at least one spring element and with a handle unit which is attached to a machine housing at least to a limited extent and which can be moved across the at least one spring element the machine housing is at least partially vibration-decoupled, and with at least one screw plate which is provided to fix the spring element in a positive and non-positive manner.
Die erfindungsgemäße Handgriffvorrichtung mit den Merkmalen des Hauptanspruchs 1 löst die gestellte Aufgabe auf einfach montierbare und kostengünstige Weise. Sie erfüllt dabei alle an sie gestellten Anforderungen.The handle device according to the invention with the features of main claim 1 solves the problem in an easy to install and inexpensive manner. It fulfills all the requirements placed on it.
Durch die in den Unteransprüchen und in der nachfolgenden Beschreibung der Ausführungsbeispiele aufgeführten Maßnahmen ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale.The measures listed in the subclaims and in the following description of the exemplary embodiments result in advantageous developments and improvements of the features specified in the main claim.
So wird ferner vorgeschlagen, dass die Schraubplatte einen Klemmbereich des Federelements bis auf eine Anlagezone zu der Handgriffeinheit hin in allen Raumrichtungen umschließt. Dadurch kann insbesondere eine stabile, qualitativ hochwertige, kompakte und kostengünstige Ausgestaltung und Anbindung der Handgriffvorrichtung an die Handwerkzeugmaschine ermöglicht werden.It is also proposed that the screw plate encloses a clamping area of the spring element in all spatial directions except for a contact zone with the handle unit. In particular, this enables a stable, high-quality, compact and inexpensive design and connection of the handle device to the hand-held power tool.
Zudem wird vorgeschlagen, dass die Schraubplatte zumindest einen Schraubdom aufweist, der zu einer Verschraubung des Federelements mit der Handgriffeinheit vorgesehen ist. Dadurch kann eine einfach montierbare und kostengünstige Ausgestaltung der Handgriffvorrichtung erreicht werden.In addition, it is proposed that the screw plate have at least one screw dome, which is provided for screwing the spring element to the handle unit. As a result, an easy-to-assemble and inexpensive configuration of the handle device can be achieved.
Des Weiteren wird vorgeschlagen, dass die Handgriffvorrichtung einen Schalterbetätiger zu einer Inbetriebnahme der Antriebsvorrichtung umfasst, wobei der Schalterbetätiger sowohl mono-stabil als auch bi-stabil zwischen zwei Schaltpositionen geschaltet werden kann. Unter "bi-stabil" soll in diesem Zusammenhang insbesondere verstanden werden, dass der Schalterbetätiger zwei stabile Schaltpositionen aufweist, in die der Schalterbetätiger geschaltet werden kann. Der Schalterbetätiger ist vorzugsweise als Ein-Aus-Schalter der Handwerkzeugmaschine gebildet. Dadurch kann eine einfach montierbare und kostengünstige Ausgestaltung der Handgriffvorrichtung erreicht werden.Furthermore, it is proposed that the handle device comprises a switch actuator for starting up the drive device, the switch actuator being able to be switched between two switching positions both mono-stably and bi-stably. In this context, “bi-stable” is to be understood in particular to mean that the switch actuator has two stable switching positions into which the switch actuator can be switched. The switch actuator is preferably formed as an on-off switch of the hand machine tool. As a result, an easy-to-assemble and inexpensive configuration of the handle device can be achieved.
Zudem wird vorgeschlagen, dass die Handgriffvorrichtung eine Zwischenplatte umfasst, die im Maschinengehäuse vorgesehen ist und welche zumindest das Federelement einseitig aufnimmt, und ein Steuermittel, über das der Schalterbetätiger mit der Betriebsartenumschaltvorrichtung derart zusammenwirkt, dass in bestimmten Betriebsarten der Schalterbetätiger nicht bi-stabil geschaltet werden kann. Unter "mono-stabil" soll in diesem Zusammenhang insbesondere verstanden werden, dass der Schalterbetätiger nur eine stabile Schaltposition aufweist, in die der Schalterbetätiger geschaltet werden kann bzw. in die der Schalterbetätiger vorzugsweise selbstständig zurückfällt, während der Schalterbetätiger in zumindest einer anderen Schaltposition von einem Bediener insbesondere gehalten werden muss. Dadurch kann eine einfach montierbare und kostengünstige Ausgestaltung der Handgriffvorrichtung erreicht werden.In addition, it is proposed that the handle device comprises an intermediate plate which is provided in the machine housing and which at least receives the spring element on one side, and a control means via which the switch actuator interacts with the operating mode switchover device in such a way that in certain operating modes the switch actuator is not switched bi-stably can. In this context, “mono-stable” is to be understood in particular to mean that the switch actuator only has a stable switching position into which the switch actuator can be switched or into which the switch actuator preferably falls back automatically, while the switch actuator in at least one other switching position Operator in particular must be kept. As a result, an easy-to-assemble and inexpensive configuration of the handle device can be achieved.
Ferner wird vorgeschlagen, dass das Steuermittel als ein Zugband ausgebildet ist. Das Zugband kann vorzugsweise aus einem Kunststoff oder einem anderen, einem Fachmann als sinnvoll erscheinenden Material gefertigt sein. Das Zugband weist vorzugsweise einen zumindest im Wesentlichen rechteckigen Querschnitt mit einer zumindest im Wesentlichen kreisähnlichen, insbesondere kreisrunden Mittelfaser auf. Es ist ferner denkbar, dass die Mittelfaster einen zumindest im Wesentlichen vier- oder sechseckigen oder einen anderen, einem Fachmann als sinnvoll erscheinenden Querschnitt aufweist. Die Mittelfaser ist vorzugsweise dazu vorgesehen, zumindest teilweise als Füllkanal insbesondere bei einem Spritzprozess zu dienen und/oder eine vorteilhaft schmale Berührlinie zur Blattfeder zu bilden. Dadurch kann eine vorteilhaft kostengünstige Ausgestaltung erreicht werden.It is also proposed that the control means be designed as a tension band. The drawstring can preferably be made of a plastic or another, a specialist be made as a material that appears reasonable. The drawstring preferably has an at least substantially rectangular cross section with an at least substantially circular-like, in particular circular, central fiber. It is also conceivable for the middle fastener to have an at least essentially quadrangular or hexagonal cross-section or another cross-section that appears reasonable to a person skilled in the art. The middle fiber is preferably provided to serve at least partially as a filling channel, in particular in a spraying process, and / or to form an advantageously narrow line of contact with the leaf spring. This enables an advantageously inexpensive configuration to be achieved.
Zudem wird vorgeschlagen, dass das zumindest eine Federelement von einer Blattfeder ausgebildet wird. Dadurch kann insbesondere eine bevorzugt kostengünstige Umsetzung und eine vorteilhaft einfache Montage der Handgriffvorrichtung erreicht werden.It is also proposed that the at least one spring element is formed by a leaf spring. In this way, in particular a preferably inexpensive implementation and an advantageously simple assembly of the handle device can be achieved.
Erfindungsgemäß wird vorgeschlagen, dass die Handgriffvorrichtung mindestens ein Sekundärfederelement aufweist, das von einem Elastomerfederelement gebildet ist. Dadurch kann insbesondere das von der Blattfeder gebildete Federelement in einer Federwirkung vorteilhaft unterstützt werden und ein Einsatz der Handgriffvorrichtung insbesondere in größeren und leistungsfähigeren Handwerkzeugmaschinen kann erreicht werden.It is proposed according to the invention that the handle device has at least one secondary spring element which is formed by an elastomer spring element. As a result, in particular the spring element formed by the leaf spring can advantageously be supported in a spring action and use of the handle device, in particular in larger and more powerful handheld power tools, can be achieved.
Ferner wird vorgeschlagen, dass das Sekundärfederelement erst nach einem bestimmten Einfederweg beaufschlagt wird. Es wird vorgeschlagen, dass die Federsteifigkeit des von der Blattfeder gebildeten Federelements so eingestellt wird, dass mit einem Einfederweg zwischen 2 mm und 10 mm, vorzugsweise zwischen 3 mm und 7 mm, besonders bevorzugt zwischen 4 mm und 5 mm minimale Betriebsandruckpunkte für die meisten wichtigen Anwendungsfälle erreicht werden. Ab dieser Andruckschwelle fängt das Sekundärfederelement an zu wirken. Je mehr das Volumen des Elastomerfederelements bei der Einfederung verformt wird, desto steifer wird eine Kennlinie des Sekundärfederelements.It is also proposed that the secondary spring element is only acted upon after a certain spring deflection. It is proposed that the spring stiffness of the spring element formed by the leaf spring be set so that with a spring deflection between 2 mm and 10 mm, preferably between 3 mm and 7 mm, particularly preferably between 4 mm and 5 mm, minimum operating pressure points for most important Use cases can be achieved. From this pressure threshold, the secondary spring element begins to act. The more the volume of the elastomer spring element is deformed during the deflection, the stiffer a characteristic curve of the secondary spring element.
Es wird deshalb weiterhin vorgeschlagen, dass die Volumenverpressung des Elastomerfederelements derart gestaltet wird, dass bei einem zusätzlichen Einfedern von 2 mm bis 5 mm, insbesondere von 3 mm bis 4 mm über einen minimalen Betriebsandruckpunkt hinaus, das Elastomerfederelement zu 70 % seines Ausgangsvolumens komprimiert wird. Bei einem weiteren Einfedern von 1 mm bis 2 mm wird quasi das ganze Volumen des Elastomerfederelements beaufschlagt, so dass die Federsteifigkeit relativ schnell ansteigt. Dies hat den Vorteil, dass bei einem Fall auf den Antivibrationshandgriff sehr viel Energie aufgenommen werden kann, so dass die stoßartig beaufschlagten Bauteile weniger belastet werden.It is therefore further proposed that the volume compression of the elastomer spring element is designed in such a way that with an additional deflection of 2 mm to 5 mm, in particular 3 mm to 4 mm, beyond a minimal operating pressure point, the elastomer spring element is 70% of its initial volume is compressed. With a further compression of 1 mm to 2 mm, the entire volume of the elastomer spring element is applied, so that the spring stiffness increases relatively quickly. This has the advantage that in the event of a fall on the anti-vibration handle, a great deal of energy can be absorbed, so that the components which are subjected to impacts are less loaded.
Erfindungsgemäß wird vorgeschlagen, dass die Schraubplatte dazu vorgesehen ist, das zumindest eine Sekundärfederelement aufzunehmen. Dadurch kann insbesondere eine stabile, qualitativ hochwertige, kompakte und kostengünstige Ausgestaltung und Anbindung der Handgriffvorrichtung an die Handwerkzeugmaschine ermöglicht werden.According to the invention, it is proposed that the screw plate be provided to receive the at least one secondary spring element. In particular, this enables a stable, high-quality, compact and inexpensive design and connection of the handle device to the hand-held power tool.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind mehrere Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the drawing. Several exemplary embodiments of the invention are shown in the drawing. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.
Es zeigen:
- Fig. 1a
- eine Handwerkzeugmaschine mit einer erfindungsgemäßen Handgriffvorrichtung in einer schematischen Seitenansicht,
- Fig. 1b
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 2
- eine Baugruppe der erfindungsgemäßen Handgriffvorrichtung in einer perspektivischen Darstellung,
- Fig. 3a
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 3b
- die Baugruppe der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 4a
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 4b
- einen alternativ ausgestalteten Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 4c
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 5
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 6a
- einen Teil der Baugruppe der erfindungsgemäßen Handgriffvorrichtung in einer perspektivischen Darstellung,
- Fig. 6b
- einen Teil der Baugruppe der erfindungsgemäßen Handgriffvorrichtung in einer Seitenansicht,
- Fig. 6c
- einen Teil der Baugruppe der erfindungsgemäßen Handgriffvorrichtung in einer Seitenansicht,
- Fig. 7a
- ein Steuermittel der erfindungsgemäßen Handgriffvorrichtung in einer schematischen Darstellung,
- Fig. 7b
- das Steuermittel der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 7c
- das Steuermittel der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 8a
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 8b
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 8c
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung während einer Montage in einer Schnittdarstellung,
- Fig. 9
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer schematischen Darstellung,
- Fig. 10
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 11
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung entlang der Schnittlinie XI-XI,
- Fig. 12a
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 12b
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 13
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Explosionsdarstellung,
- Fig. 14a
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung,
- Fig. 14b
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung entlang der Schnittlinie XIVb-XIVb und
- Fig. 15
- einen Ausschnitt der erfindungsgemäßen Handgriffvorrichtung in einer Schnittdarstellung.
- Fig. 1a
- a handheld power tool with a handle device according to the invention in a schematic side view,
- Fig. 1b
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 2
- 1 shows an assembly of the handle device according to the invention in a perspective view,
- Fig. 3a
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 3b
- the assembly of the handle device according to the invention in a sectional view,
- Fig. 4a
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 4b
- FIG. 2 shows an alternative cutout of the handle device according to the invention in a sectional view,
- Fig. 4c
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 5
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 6a
- a part of the assembly of the handle device according to the invention in a perspective view,
- Fig. 6b
- a part of the assembly of the handle device according to the invention in a side view,
- Fig. 6c
- a part of the assembly of the handle device according to the invention in a side view,
- Fig. 7a
- a control means of the handle device according to the invention in a schematic representation,
- Fig. 7b
- the control means of the handle device according to the invention in a sectional view,
- Fig. 7c
- the control means of the handle device according to the invention in a sectional view,
- Fig. 8a
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 8b
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 8c
- 1 shows a section of the handle device according to the invention during assembly in a sectional view,
- Fig. 9
- a section of the handle device according to the invention in a schematic representation,
- Fig. 10
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 11
- 1 shows a section of the handle device according to the invention in a sectional view along the section line XI-XI,
- Fig. 12a
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 12b
- 1 shows a section of the handle device according to the invention in a sectional view,
- Fig. 13
- a section of the handle device according to the invention in an exploded view,
- 14a
- 1 shows a section of the handle device according to the invention in a sectional view,
- 14b
- a section of the handle device according to the invention in a sectional view along the section line XIVb-XIVb and
- Fig. 15
- a section of the handle device according to the invention in a sectional view.
Die Handgriffvorrichtung für die Handwerkzeugmaschine 10 umfasst ein Federelement 18 und eine an dem Maschinengehäuse 20 zumindest begrenzt beweglich angebrachten Handgriffeinheit 22, welche über das Federelement 18 gegenüber dem Maschinengehäuse 20 schwingungsentkoppelt ist und den Schalterbetätiger 24 zu einer Inbetriebnahme der Antriebsvorrichtung 14 umfasst. Die Handgriffeinheit 22 umfasst einen Antivibrationshandgriff 58. Die Handwerkzeugmaschinenvorrichtung weist ferner ein Steuermittel 28 auf, über das der Schalterbetätiger 24 mit der Betriebsartenumschaltvorrichtung 12 derart zusammenwirkt, dass in bestimmten Betriebsarten der Schalterbetätiger 24 nicht bi-stabil geschaltet werden kann. Das Steuermittel 28 ist als ein Zugband 30 ausgebildet. Die u.a. in
Eine der zentralen Aufgaben der Zwischenplatte 26 ist die Aufnahme und Führung des Federelements 18, wie in den
Des Weiteren dient die Zwischenplatte 26 der Aufnahme von oder als Anschlag für ein oder mehrere Sekundärfederelemente 34, 34', 34", die als Dämpfungselemente dienen können. In den
Federung und Dämpfung werden folglich zentral über die Aufnahme des Federelements 18 und der Sekundärfederelemente 34, 34', 34" in der Zwischenplatte 26 aufeinander eingestellt. Es entsteht die kompakte Baugruppe, die zu einer Vormontage vorgesehen ist und die alle wesentlichen Bauteile für den Wirkzusammenhang der Entkopplung miteinander vereint. Das Prinzip erleichtert die Abstimmung der Komponenten zur Entkopplung und eröffnet darüber hinaus die Möglichkeit, durch Weglassen der Baugruppe ohne großen Aufwand einen starren Handgriff der Handgriffeinheit 22 ohne Umschaltung daraus abzuleiten.Suspension and damping are consequently adjusted to one another centrally via the accommodation of the spring element 18 and the
Die besondere Ausgestaltung der Zwischenplatte 26 ermöglicht ferner eine verbesserte Führung der Handwerkzeugmaschine 10 und insbesondere eine verbesserte Übertragung von Bedienkräften am Antivibrationshandgriff 58 auf das Maschinengehäuse 20 der Handwerkzeugmaschine 10. Nach
Die Zwischenplatte 26 ist im Maschinengehäuse 20 vorgesehen und nimmt das Federelement 18 einseitig auf. Schließlich wird in der Zwischenplatte 26 die Schaltschieberbaugruppe aufgenommen Die Schaltschieberbaugruppe besteht dabei gemäß den
Dadurch lassen sich Maßabhängigkeiten, welche sich auf Wege der Betriebsartenumschaltung vom Schalterbetätiger 24 auswirken, in nur einem Bauteil regulieren. Es wird wenig Bauraum benötigt. Die Montage ist einfach. Die verbreiterte Kopfauflage am Schaltschieber 66 gepaart mit Sprüngen/Stufen in der Führung verhindert einen Staubeinschluss zwischen Gleitflächen. Dadurch kann eine Fehlfunktion durch Klemmen am Schaltschieber 66 grundsätzlich vermieden werden.As a result, dimensional dependencies which have an effect on the way of switching the operating mode from the
Der z-förmige, gekröpfte Schaltschieber 66 lässt sich mit einer einfachen Schiebebewegung in die Zwischenplatte 26 hinein schieben und verrastet über eine nicht näher dargestellte Schnapphakenverbindung in der vorgesehenen Einbaulage. Es ist ferner denkbar, dass sich der z-förmige, gekröpfte Schaltschieber 66 mit einer einfachen Schwenkbewegung in die Zwischenplatte 26 hinein drehen lässt. Das Längenverhältnis der Führungsflächen untereinander sorgt für ausreichend Vorzentrierung während der gesamten Vormontage. Eine Fehlmontage ist dadurch ausgeschlossen.The z-shaped, cranked
Für eine betriebsartenabhängige Umschaltung vom Hammerschalter gemäß der Druckschrift
Reibungsverluste, Verformung des Federelements 18 sowie Aspekte aus dem Herstellprozess machen eine Umsetzung dieses Konzepts in der Praxis allerdings schwierig.Friction losses, deformation of the spring element 18 and aspects from the manufacturing process make it difficult to implement this concept in practice.
Aus diesem Grund sind für die Ausführung des Zugbands 30 speziell Werkstoff und Geometrie entscheidend. Als Werkstoff bietet Kunststoff sehr vielfältige Variationen, um niedrige Reibwerte mit guten Notlaufeigenschaften und geringer Staubanfälligkeit zu vereinen. Deshalb ist ein Kunststoff grundlegend für diese Anwendung ein sehr geeigneter Werkstoff.For this reason, the material and geometry are decisive for the design of the tension band 30. As a material, plastic offers a wide range of variations to combine low friction values with good emergency running properties and low susceptibility to dust. Therefore, a plastic is essential for this application a very suitable material.
Um ausreichend Steifigkeit für die Übertragung von Zugkräften zu erreichen, ohne gleichzeitig an Flexibilität für eine Mitnahme über das Federelement 18 zu verlieren, sind Querschnittverhältnisse bestimmend.In order to achieve sufficient rigidity for the transmission of tensile forces without at the same time losing flexibility for being carried along via the spring element 18, cross-sectional conditions are decisive.
Ein Bandquerschnitt des Zugbands 30 muss sehr flach in der Höhe und dafür lang in die Breite verlaufen. In der vorliegenden Konstruktion wurde ein Rechteckquerschnitt mit einem Seitenverhältnis von 1:10 kombiniert mit einer im Wesentlichen kreisähnlichen, insbesondere kreisrunden, Mittelfaser gewählt (siehe
Flächenanteile sind über die gesamte Länge des Zugbands 30 variabel einstellbar, müssen in der Summe jedoch ausgeglichen bleiben. Dadurch wird trotz Ösen und Umlenkung im Einsatz eine immer gleich bleibende Spannung im Zugband 30 aufrechterhalten. Es kann eine gleichförmige Beanspruchung des Werkstoffs sichergestellt werden.Area shares can be variably adjusted over the entire length of the drawstring 30, but the sum must remain balanced. As a result, a constant tension in the tension band 30 is maintained in spite of eyelets and deflection in use. Uniform stress on the material can be ensured.
Zwischen Steifigkeit und Flexibilität hilft auch die Variation der Flächenanteile. Der im Wesentlichen kreisähnliche, insbesondere kreisrunde Anteil dient zum Füllen der Form im Herstellprozess und erhöht gleichzeitig vorteilhaft die Festigkeit.The variation of the surface proportions also helps between stiffness and flexibility. The essentially circular-like, in particular circular, portion serves to fill the mold in the manufacturing process and at the same time advantageously increases the strength.
Aufgrund von Herstelltoleranz, thermisch-elastischen Längenänderungen, Schwindung/Nachkristallisierung und dem ausgeprägten Fließverhalten von Kunststoff unter Belastung des Zugbands 30, summieren sich bei der Übertragung der Zugkräfte und Wege am Zugband 30, das aus Kunststoff gefertigt ist, Differenzen auf, die eine sichere und zufriedenstellende Funktion des Schalterbetätigers 24 auf mechanischem Wege nur bedingt gewährleisten.Due to manufacturing tolerance, thermal-elastic changes in length, shrinkage / recrystallization and the pronounced flow behavior of plastic under load on the tension band 30, differences add up during the transmission of the tensile forces and paths on the tension band 30, which is made of plastic, which are safe and Ensure satisfactory function of the
Mit Hilfe der Kompensationsfeder 68 (siehe
In der Vorspannung der Kompensationsfeder 68 wird durch die Einbausituation im Schaltschieber 66 ein Puffer geschaffen, der alle Unschärfen aus Herstellung und mechanischem Verhalten des Zugbands 30, das aus Kunststoff gefertigt ist, ausgleichen kann.In the pretension of the
Das Zugband 30 muss dafür einen Korpus zur Aufnahme der Kompensationsfeder 68 haben und mit Hilfe von zwei Drehaufnahmen sicher im Schaltschieber 66 aufgenommen/geführt werden. Der Schaltschieber 66 stützt die Kompensationsfeder 68 auf der Gegenseite ab und bestimmt über die Einbaulänge das Maß für den Ausgleich.For this purpose, the tension band 30 must have a body for receiving the
Bei Betätigung der Umschaltung wird der Weg vom Schaltschieber 66 nun kraftabhängig auf das Zugband 30 und den Schalterbetätiger 24 übertragen (siehe
Für eine einfache Montage wurde am Schaltschieber vorne eine Öffnung in der Führung gelassen und dem Zugband 30 eine Schnappverbindung spendiert, d.h. vorgesehen (siehe
Für einen effektiven Staubschutz ist über die Zwischenplatte 26 weiters ein Labyrinth 70 vorgesehen, welches zur Abdeckung des ein Schlagwerkgehäuse und einen Gehäusedeckel umfassenden Maschinengehäuses 20, der eine Motorbaugruppe umfassenden Antriebsvorrichtung 14 und des Antivibrationshandgriffs 58 nach innen hinein erreicht (siehe
Ein weiterer Aspekt der Erfindung betrifft den Umstand, dass bei größeren und leistungsfähigeren Handwerkzeugmaschinen 10, wie z.B. bei schweren Bohr- und Meißelhämmern, die oben beschriebene Fixierung der Blattfeder 32 zwischen dem Antivibrationshandgriff 58 und dem Maschinengehäuse 20 nicht mehr ausreicht. Beispielsweise reicht hier die Blattfeder 32 als alleiniges Federelement nicht mehr aus. Es müssen noch zusätzliche Sekundärfederelemente 34 zwischen dem Maschinengehäuse 20 und der Blattfeder 32 eingebracht werden, um die zu weiche Blattfeder 32 in ihrer Federwirkung zu unterstützen. Die Sekundärfederelemente 34 sind jeweils von einem Elastomerfederelement 36 gebildet.Another aspect of the invention relates to the fact that in the case of larger and more powerful
Gemäß der Druckschrift
Der vom Bediener gehaltene Antivibrationshandgriff 58 beinhaltet den als Ein- Aus-Schalter ausgebildeten Schalterbetätiger 24 und wird durch Verschrauben einer Griffschale des Antivibrationshandgriffs 58 nach hinten hin abgeschlossen.The anti-vibration handle 58 held by the operator contains the
Oben ist die Blattfeder 32 zwischen dem Antivibrationshandgriff 58 und zwei Schraubplatten 48 eingespannt. Die beiden Schraubplatten 48 werden in Querrichtung beidseitig auf die Blattfeder 32 aufgeschoben. Die Schraubplatten 48 umschließen somit einen oberen Klemmbereich 50 der Blattfeder 32 bis auf die Anlagezone zum Antivibrationshandgriff 58 hin in allen Raumrichtungen. Dies gewährleistet eine dauerhafte und stabile Einfassung der Blattfeder 32. In den Schraubplatten 48 befinden sich Schraubdome 52, die zur Verschraubung der Schraubplatten 48 und damit einer der Blattfeder 32 mit dem Antivibrationshandgriff 58 dienen. Die Schraubplatten 48, die Blattfeder 32, der Antivibrationshandgriff 58 und ein verspannter Faltenbalg 72 bilden ein Befestigungssystem, das über Form- und Kraftschluss vorteilhaft zusammengehalten wird. Der Formschluss wird über einander gegenseitig abstützende und durchdringende Haltedome und Rippen gebildet, so dass der Kraftschluss nur eine fixierende Funktion hat und die wesentlichen Kräfte durch den Formschluss der Bauteile aufgenommen werden.The leaf spring 32 is clamped at the top between the
Ein wesentlicher Vorteil der beidseitig aufgeschobenen Schraubplatten 48 ist die Schaffung von zusätzlichen Funktionsflächen vor einem Bereich und seitlich eines Bereichs der Schraubplatten 48 der Blattfeder 32.A major advantage of the
Im vorderen Bereich sind die Schraubplatten 48 so ausgebildet, dass sie die zusätzlichen Sekundärfederelemente 34 aufnehmen. Neben Federaufnahmen haben die Schraubplatten 48 noch zusätzliche Funktionen. Um ein Herausreißen des Antivibrationshandgriffs 58 und damit auch eine Überlastung der Blattfeder 32 zu verhindern, besitzen die Schraubplatten 48 seitliche Anlageflächen, welche sich rückseitig an zwei, als Gehäuserückplatten ausgebildeten Rückplatten 38 abstützen. Dadurch besitzt der Antivibrationshandgriff 58 einen stabilen und definierten rückseitigen Anschlag. Eine weitere Funktion der Schraubplatten 48 ist das seitliche Führen und das Abdecken des von dem Zugband 30 gebildeten Steuermittels 28 gegenüber dem aus einem Elastomer gebildeten Sekundärfederelement 34. Mit dem Zugband 30 wird der von dem Ein-Aus-Schalter gebildete Schalterbetätiger 24 während eines Meißelns blockiert, so dass der Bediener den Schalterbetätiger 24 nicht ständig drücken muss. Das Zugband 30 muss leichtgängig auf der Blattfeder 32 gleiten können und darf nicht verklemmt oder eingeklemmt werden.In the front area, the
Während des Zusammenschiebens der beiden Schraubplatten 48 auf die Blattfeder 32 wird das Zugband 30 in einem Schacht der Schraubplatten 48 gekammert. Auch der Faltenbalg 72 wird durch die Schraubplatten 48 im Antivibrationshandgriff 58 gekammert. Weiterhin bilden die Schraubplatten 48 auch den Endanschlag in Längs- und Hochrichtung des Antivibrationshandgriffs 58.When the two
Die untere Blattfederklemmung ist in die Verschraubungssystematik der Rückplatten 38 zum Maschinengehäuse 20 vorteilhaft integriert worden (siehe
Wie schon bei der Druckschrift
Zur Klemmung der Blattfeder 32 werden sowohl kraft- als auch formschlüssige Elemente verwendet. Als Formschluss besitzt die Blattfeder 32 an ihrem unteren Ende zwei Durchbrüche und eine Abfalzung 74. Die Blattfeder 32, die Federplatte 40 und das Maschinengehäuse 20 sind auf zwei Dome der jeweiligen Seite der von den Gehäuserückplatten gebildeten Rückplatten 38 aufgefädelt. Weiterhin umgreift die Federplatte 40 auch die beiden Schraubdome des Maschinengehäuses 20. Die Abfalzung 74 der Blattfeder 32 wird zwischen den Rückplatten 38 und der Federplatte 40 verspannt. Durch Verschrauben der von den Gehäuserückplatten gebildeten Rückplatten 38 mit dem Maschinengehäuse 20 werden alle Teile miteinander verspannt. Durch die vorteilhafte Schachtelung der Bauteile ineinander entsteht eine dauerhafte Verbindung, die auch der großen Vibrationsbelastung in der von einem schlagenden Elektrowerkzeug gebildeten Handwerkzeugmaschine 10 standhält.Both non-positive and positive elements are used to clamp the leaf spring 32. As a positive connection, the leaf spring 32 has at its lower end two openings and a
Auch im Falle eines Vorspannungsverlusts in der Schraubverbindung aufgrund von Setz- oder Lösungsvorgängen bleibt die Verbindung auf Grund des Formschlusses aufrechterhalten. Die Federplatte 40 ist in ihrer Höhenkontur dermaßen gestaltet, dass die Blattfeder 32 auf ca. 25 % ihrer Länge unten fest eingespannt ist. Die restliche Länge kann beim Einfedern frei auskragen.Even in the event of a loss of preload in the screw connection due to setting or loosening processes, the connection is maintained due to the positive connection. The height of the
Ein weiterer Erfindungsaspekt ist die Kombination der Blattfeder 32 als primäres Federelement und des noch mindestens einen weiteren Sekundärfederelements 34, das aber erst nach einem gewissen Einfederweg beaufschlagt wird.Another aspect of the invention is the combination of the leaf spring 32 as the primary spring element and the at least one further
Geschäumte Elastomerformteile haben den Vorteil der kostengünstigen Herstellung durch einen kontinuierlichen Strangspritzprozess mit anschließendem Ablängen auf die benötigte Baulänge. Weiterhin wirken sie quasi in allen Raumrichtungen, d.h. sie haben keine Vorzugsrichtung wie z.B. eine Schraubendruckfeder.Foamed elastomer molded parts have the advantage of cost-effective production through a continuous extrusion process with subsequent cutting to the required length. Furthermore, they work in almost all spatial directions, i.e. they have no preferred direction, e.g. a helical compression spring.
Das vorteilhafte, als Elastomerfederelement 36 ausgebildete Sekundärfederelement 34 unterstützt die Blattfeder 32 bei Belastungen, die oberhalb eines optimalen Betriebsandruckpunkts liegen. Der optimale Betriebsandruckpunkt ist der Mindestandruck, der vom Bediener gerade noch erbracht werden muss, damit die von dem Bohrhammer gebildete Handwerkzeugmaschine 10 einen regelmäßigen und sauberen Schlagbetrieb ausführt. Dieser Bedienandruck ist abhängig von der Leistungsklasse der Handwerkzeugmaschine 10 und vom jeweiligen Einsatzfall.The advantageous
D.h. durch Vorsehen eines bestimmten Spiels des Elastomerfederelements 36 zwischen den Anlageflächen wird eine mindestens zweistufige Federkennlinie erzeugt. Bis zum Betriebsandruckpunkt wirkt ausschließlich die Blattfeder 32, so dass eine sehr gute Entkopplung des Antivibrationshandgriffs 58 mit einem niedrigen Vibrationsniveau erreicht werden kann. Eine gute Entkopplung wird in diesem Bereich vor allem auch deshalb erreicht, weil die Blattfeder 32 eine sehr geringe Dämpfungskonstante hat. Bei einem Überdrücken oder bei einem Fall der Handwerkzeugmaschine 10 auf den Antivibrationshandgriff 58 nimmt dann das Elastomerfederelement 36 den wesentlichen Anteil an Belastungen auf.That by providing a certain play of the elastomer spring element 36 between the contact surfaces, an at least two-stage spring characteristic is generated. Up to the operating contact point, only the leaf spring 32 acts, so that very good decoupling of the anti-vibration handle 58 can be achieved with a low vibration level. A good decoupling is achieved in this area primarily because the leaf spring 32 has a very low damping constant. If the hand-held
Es wird vorgeschlagen das die Federsteifigkeit der Blattfeder 32 so eingestellt wird, dass mit einem Einfederweg zwischen 2 mm und 10 mm, vorzugsweise zwischen 3 mm und 7 mm, besonders bevorzugt zwischen 4 mm und 5 mm die minimalen Betriebsandruckpunkte für die meisten wichtigen Anwendungsfälle erreicht werden. Ab dieser Andruckschwelle fängt das Sekundärfederelement 34 an zu wirken. Je mehr das Volumen des Elastomerfederelements 36 bei der Einfederung verformt wird, umso steifer wird die Kennlinie des Sekundärfederelements 34. Es wird deshalb weiterhin vorgeschlagen, dass eine Volumenverpressung des Elastomerfederelements 36 derart gestaltet wird, dass bei einem zusätzlichen Einfedern von 2 mm bis 5 mm, insbesondere von 3 mm bis 4 mm über den minimalen Betriebsandruckpunkt hinaus das Elastomerfederelement 36 zu 70 % seines Ausgangsvolumens komprimiert wird. Bei weiterem Einfedern von 1 mm bis 2 mm wird quasi das ganze Volumen des Elastomerfederelements 36 beaufschlagt, so dass die Federsteifigkeit relativ schnell ansteigt. Dies hat den Vorteil, dass bei einem Fall auf den Antivibrationshandgriff 58 sehr viel Energie aufgenommen werden kann, so dass die stoßartig beaufschlagten Bauteile weniger belastet werden. Eine beschriebene Einfederungscharakteristik kann auch durch eine gezielte Formgebung des Elastomerfederelements 36 bewirkt bzw. unterstützt werden. So können auch schlauchförmige oder sonstige in einem Strangprozess erzeugbare Konturen verbaut werden. Das Elastomerfederelement 36 ist dabei vorzugsweise aus geschäumten Elastomer (Moosgummi), welches in einem kontinuierlichen Strangspritzprozeß mit anschließendem Ablängen hergestellt wird.It is proposed that the spring stiffness of the leaf spring 32 be set such that the minimum operating pressure points for most important applications are achieved with a spring deflection between 2 mm and 10 mm, preferably between 3 mm and 7 mm, particularly preferably between 4 mm and 5 mm , From this pressure threshold, the
Claims (8)
- Handle device for a hand-held power tool (10) which has an operating-mode-switchover device (12) and a drive device (14) for driving an insertion tool (16) in different operating modes, said handle device having at least one spring element (18) and having a handle unit (22), which is fitted on a machine housing (20) such that it can be moved at least to a limited extent and which is isolated from the machine housing (20) in terms of vibration, at least to some extent, via the at least one spring element (18), and having at least one screw-connection plate (48), which is provided to fix the spring element (18) in a form-fitting and force-fitting manner, characterized in that the handle device has at least one secondary spring element (34), which is formed by an elastomeric spring element (36), wherein the screw-connection plate (48) is provided to accommodate the at least one secondary spring element (34).
- Handle device according to Claim 1, characterized in that the screw-connection plate (48) has at least one screw-connection pin (52), which is provided to screw-connect the spring element (18) to the handle unit (22).
- Handle device according to either of the preceding claims, characterized by a switch activator (24) for operating the drive device (14), wherein the switch actuator (24) can be switched in both monostable and bistable form between two switching conditions.
- Handle device according to Claim 3, characterized by an intermediate plate (26), which is provided in the machine housing (20) and accommodates at least the spring element (18) on one side, and by a control means (28), via which the switch actuator (24) interacts with the operating-mode-switchover device (12) such that, in certain operating modes, the switch actuator (24) cannot be switched in bistable form.
- Handle device according to Claim 4, characterized in that the control means (28) is designed in the form of a tensile strip (30).
- Handle device according to one of the preceding claims, characterized in that the at least one spring element (18) is formed by a leaf spring (32).
- Handle device according to one of the preceding claims, characterized in that the secondary spring element (34) is activated only once a certain inward-deflection distance has been covered.
- Hand-held power tool (10), in particular hammer drill and/or chisel hammer, having a handle device according to one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011082093A DE102011082093A1 (en) | 2011-09-02 | 2011-09-02 | Handle device for a hand tool |
PCT/EP2012/067036 WO2013030382A1 (en) | 2011-09-02 | 2012-08-31 | Handle device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2750836A1 EP2750836A1 (en) | 2014-07-09 |
EP2750836B1 true EP2750836B1 (en) | 2020-02-26 |
Family
ID=47146340
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12783534.6A Active EP2750835B1 (en) | 2011-09-02 | 2012-08-31 | Hand-held power tool |
EP12790435.7A Active EP2750836B1 (en) | 2011-09-02 | 2012-08-31 | Handle device |
EP12797722.1A Active EP2750834B1 (en) | 2011-09-02 | 2012-08-31 | Handle device |
EP12809620.3A Active EP2750837B1 (en) | 2011-09-02 | 2012-08-31 | Handle device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12783534.6A Active EP2750835B1 (en) | 2011-09-02 | 2012-08-31 | Hand-held power tool |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12797722.1A Active EP2750834B1 (en) | 2011-09-02 | 2012-08-31 | Handle device |
EP12809620.3A Active EP2750837B1 (en) | 2011-09-02 | 2012-08-31 | Handle device |
Country Status (4)
Country | Link |
---|---|
EP (4) | EP2750835B1 (en) |
CN (3) | CN103764350B (en) |
DE (1) | DE102011082093A1 (en) |
WO (4) | WO2013030381A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2813326A1 (en) * | 2013-06-13 | 2014-12-17 | HILTI Aktiengesellschaft | Machine tool |
JP6105454B2 (en) * | 2013-11-26 | 2017-03-29 | 株式会社マキタ | Work tools |
DE102022206667A1 (en) * | 2022-06-30 | 2024-01-04 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hand tool |
Citations (1)
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WO2012016729A1 (en) * | 2010-08-02 | 2012-02-09 | Robert Bosch Gmbh | Electric machine-tool comprising a lockable rocker switch |
Family Cites Families (14)
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NL290159A (en) * | 1962-03-13 | |||
EP0391856A3 (en) * | 1989-04-07 | 1992-07-08 | SIG Schweizerische Industrie-Gesellschaft | Pneumatic hammer |
US5697456A (en) * | 1995-04-10 | 1997-12-16 | Milwaukee Electric Tool Corp. | Power tool with vibration isolated handle |
DE19720947B4 (en) | 1996-06-15 | 2005-07-28 | Robert Bosch Gmbh | Electric combination hammer |
DE10034768A1 (en) * | 2000-07-18 | 2002-02-07 | Bosch Gmbh Robert | Combination electric hand tool operating as hammer drill or electric chisel, has pivoted jaw catch mechanism with blocking component in handle |
DE10036078B4 (en) * | 2000-07-25 | 2007-04-05 | Robert Bosch Gmbh | Hand tool machine with a handle and an insulating device |
DE10259566A1 (en) * | 2002-12-19 | 2004-07-01 | Hilti Ag | Hitting electric hand machine tool |
DE102004061521A1 (en) * | 2004-12-21 | 2006-06-29 | Hilti Ag | Tool device with decoupled main handle |
DE102006029630A1 (en) | 2006-06-28 | 2008-01-03 | Robert Bosch Gmbh | Hand tool |
DE102007001591A1 (en) * | 2007-01-10 | 2008-07-17 | Aeg Electric Tools Gmbh | Portable, hand-held machine tool |
DE102007000362A1 (en) * | 2007-07-02 | 2009-01-08 | Hilti Aktiengesellschaft | Vibrating hand tool with a lock switch of the engine switch |
DE202008008844U1 (en) * | 2008-09-22 | 2008-11-20 | Einhell Germany Ag | Hand tool |
DE102010038753A1 (en) | 2010-08-02 | 2012-02-02 | Robert Bosch Gmbh | Anti-vibration handle with train-loaded switch connection |
DE102010063962A1 (en) * | 2010-12-22 | 2012-06-28 | Robert Bosch Gmbh | Lockable electrical switch |
-
2011
- 2011-09-02 DE DE102011082093A patent/DE102011082093A1/en not_active Withdrawn
-
2012
- 2012-08-31 WO PCT/EP2012/067035 patent/WO2013030381A1/en unknown
- 2012-08-31 CN CN201280042520.8A patent/CN103764350B/en active Active
- 2012-08-31 EP EP12783534.6A patent/EP2750835B1/en active Active
- 2012-08-31 CN CN201280042543.9A patent/CN103796800B/en active Active
- 2012-08-31 WO PCT/EP2012/067030 patent/WO2013030377A1/en unknown
- 2012-08-31 WO PCT/EP2012/067036 patent/WO2013030382A1/en unknown
- 2012-08-31 EP EP12790435.7A patent/EP2750836B1/en active Active
- 2012-08-31 CN CN201280042590.3A patent/CN103781597A/en active Pending
- 2012-08-31 EP EP12797722.1A patent/EP2750834B1/en active Active
- 2012-08-31 EP EP12809620.3A patent/EP2750837B1/en active Active
- 2012-08-31 WO PCT/EP2012/067034 patent/WO2013030380A1/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2012016729A1 (en) * | 2010-08-02 | 2012-02-09 | Robert Bosch Gmbh | Electric machine-tool comprising a lockable rocker switch |
EP2601019A1 (en) * | 2010-08-02 | 2013-06-12 | Robert Bosch GmbH | Electric machine-tool comprising a lockable rocker switch |
Also Published As
Publication number | Publication date |
---|---|
CN103764350B (en) | 2016-10-26 |
EP2750834B1 (en) | 2022-01-19 |
WO2013030382A1 (en) | 2013-03-07 |
WO2013030377A1 (en) | 2013-03-07 |
EP2750837A1 (en) | 2014-07-09 |
CN103781597A (en) | 2014-05-07 |
CN103796800A (en) | 2014-05-14 |
CN103764350A (en) | 2014-04-30 |
EP2750835A1 (en) | 2014-07-09 |
EP2750836A1 (en) | 2014-07-09 |
EP2750835B1 (en) | 2022-12-28 |
EP2750834A1 (en) | 2014-07-09 |
WO2013030381A1 (en) | 2013-03-07 |
CN103796800B (en) | 2017-02-15 |
WO2013030380A1 (en) | 2013-03-07 |
EP2750837B1 (en) | 2019-08-14 |
DE102011082093A1 (en) | 2013-03-07 |
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