Classifications

• • 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 the independent claims.
• Antivibration handles with an elastic connection to the hammer also cause relative movements between the hammer and the handle itself due to the required rigidity as a side effect. From this, requirements for the interface between a hammer and an anti-vibration handle can be derived:
• the invention relates to a handle device for a hand tool having an operating mode switching device and a drive device for driving an insert tool in different modes, with at least one spring element and with a machine housing at least limited movably mounted handle unit, which over the at least one spring element relative to the Machine housing is at least partially vibration decoupled and comprises a switch actuator to a commissioning of the drive device, wherein the switch actuator can be switched both mono-stable and bi-stable between two switching positions.
• the handle device has an intermediate plate, which is provided in the machine housing and which accommodates at least the spring element on one side, and a control means, via which the switch actuator with the Radiogon tenschaltschaltvoriques cooperates such that in certain modes of the switch actuator is not bi-stable can be switched.
• a control means via which the switch actuator with the Radiogon tenschaltschaltvoriques cooperates such that in certain modes of the switch actuator is not bi-stable can be switched.
• the switch actuator only has a stable switching position, in which the switch actuator can be switched or in which the switch actuator preferably falls back automatically, while the switch operator in at least one other switching position of a operator must be kept in particular.
• the term "bi-stable” should be understood in particular to mean that the switch actuator has two stable switching positions into which the switch actuator can be switched
• Switch actuator is preferably formed as an on-off switch of the power tool.
• the handle device according to the invention solves the task in a simple to assemble and cost-effective manner. It fulfills all requirements placed on it.
• control means is designed as a drawstring.
• the drawstring may preferably be made of a plastic or other material that appears appropriate to a person skilled in the art.
• the tension band preferably has an at least substantially rectangular cross section with an at least substantially circular-like, in particular circular middle fiber. It is also conceivable for the middle formers to have an at least essentially four- or hexagonal or another cross-section which appears expedient to a person skilled in the art.
• the middle fiber is preferably provided to serve at least partially as a filling channel, in particular during an injection process, and / or to form an advantageously narrow contact line with the leaf spring.
• the drawstring may preferably be made of a plastic. As a result, an advantageous cost-effective design can be achieved.
• the at least one spring element is formed by a leaf spring.
• the handle device has at least one secondary spring element, which is formed by an elastomeric spring element.
• the spring element formed by the leaf spring can be advantageously supported in a spring action, and use of the handle device, in particular in larger and more powerful hand tool machines, can be achieved.
• the secondary spring element is acted upon only after a certain compression travel. It is proposed that the spring stiffness of the spring element formed by the leaf spring is adjusted so that with a compression travel between 2 mm and 10 mm, preferably between 3 mm and 7 mm, more preferably between 4 mm and 5 mm minimum operating pressure points for most important Use cases can be achieved. From this Andruckschwelle the secondary spring element begins to act. The more volume of the
• Eiastomerfederelements is designed such that at an additional compression of 2 mm to 5 mm, in particular from 3 mm to 4 mm over a minimum operating pressure point beyond the elastomeric spring element is compressed to 70% of its original volume. In a further compression of 1 mm to 2 mm, virtually the entire volume of the Eiastomerfederelements is acted upon, so that the spring stiffness increases relatively quickly. This has the advantage that in a case on the Antivibrati- onshandgriff very much energy can be absorbed, so that the impact-like components are less loaded.
• FIG. 1 a shows a handheld power tool with a handle device according to the invention in a schematic side view
• Fig. 1 b shows a detail of the handle device according to the invention in a
• Sectional view 2 shows an assembly of the handle device according to the invention in a perspective view
• 3a shows a detail of the handle device according to the invention in one
• FIG. 4a shows a detail of the handle device according to the invention in a
• Fig. 4c shows a detail of the handle device according to the invention in one
• Fig. 5 shows a detail of the handle device according to the invention in a
• FIG. 6a shows a part of the assembly of the handle device according to the invention in a perspective view
• 6b shows a part of the assembly of the handle device according to the invention in a side view
• 6c shows a part of the assembly of the handle device according to the invention in a side view
• FIG. 7a shows a control means of the handle device according to the invention in a schematic representation
• FIG. 8a shows a detail of the handle device according to the invention in one
• Fig. 10 shows a detail of the handle device according to the invention in a
• Sectional view Fig. 1 1 a detail of the handle device according to the invention in a
• Fig. 12b shows a detail of the handle device according to the invention in one
• Fig. 13 shows a detail of the handle device according to the invention in one
• Fig. 14b shows a detail of the handle device according to the invention in one
• Fig. 15 shows a detail of the handle device according to the invention in a
• FIG. 1 shows a schematic view of a drill and / or chisel hammer as an example of a hand tool 10 with a machine housing 20, a tool holder 54 movably mounted on the machine housing 20 for exchangeable reception of an insert tool 16 and with a housing 20 accommodated in the machine housing, a drive unit and a gear unit having drive device 14 for driving the insert tool 16 in different modes.
• the tool holder 54 is preferably rotatably arranged on an end face of the machine housing 20.
• a handle device is further provided in the example of Figure 1 further.
• the handle device comprises in the present example a switch actuator 24 for commissioning the drill and / or chisel hammer.
• the switch actuator 24 can be switched both monostable and bi-stable between two switching positions.
• an additional handle device 56 is arranged on the machine housing 20 of the drill and / or chisel hammer, in particular arranged adjustable.
• the hand tool 10 has an operating mode switching device 12.
• a Conshebei for a mode switch 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 power tool 10 comprises a spring element 18 and a at least limited movably mounted on the machine housing 20 handle unit 22 which is vibration-decoupled via the spring member 18 relative to the machine housing 20 and the switch actuator 24 includes a commissioning of the drive device 14.
• the handgrip unit 22 comprises an anti-vibration handle 58.
• the handheld power tool device further comprises a control means 28, via which the switch actuator 24 cooperates with the mode changeover device 12 in such a way that in certain operating modes
• Switch actuator 24 can not be bi-stable switched.
• the control means 28 is designed as a drawstring 30.
• the u.a. shown assembly consists of the following functional units: an intermediate plate 26, the spring element 18 and a slide valve assembly.
• the intermediate plate 26 is the central
• One of the central tasks of the intermediate plate 26 is the receiving and guiding of the spring element 18, as shown in Figures 3a and 3b.
• the spring element 18 is clamped by the intermediate plate 26 in the anti-vibration handle 58 and fixed at the clamping point over 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 stiffness, 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 as a stop for or as a stop for one or more secondary spring elements 34, 34 ', 34 ", which can serve as damping elements.
• FIGS. 4a to 4c show conceivable variants and embodiments of the secondary spring elements 34, 34', 34 "presented.
• pockets with supporting ribs 60 and a frame 62 additionally provide for the introduction of damping elements into the intermediate plate 26.
• the secondary spring elements 34, 34 ', 34 " can preferably be made of foam, a cellular rubber
• Sponge rubber another synthetic or natural foam, elastomer, TPE, rubber, be formed gel or a similar elastic material.
• the degree of damping or suspension can also be adjusted via the volume of individual chambers.
• the frame 62 prevents jamming with other surrounding components.
• the trained as a drawstring 30 control means 28 is made of plastic.
• Slide valve 66 paired with jumps / steps in the guide prevents one Dust enclosure between sliding surfaces. As a result, a malfunction can be avoided by clamping on the slide valve 66 in principle.
• the z-shaped, cranked slide switch 66 can be pushed into the intermediate plate 26 with a simple sliding movement and locked in place by means of a snap hook connection, not shown, in the intended installation position. It is also conceivable that the z-shaped, cranked slide switch 66 can rotate into the intermediate plate 26 with a simple pivoting movement.
• the aspect ratio of the guide surfaces ensures sufficient pre-centering during the entire pre-assembly. A wrong assembly is thereby excluded.
• plastic offers a great variety of variations in order to combine low friction values with good emergency running properties and low dust susceptibility. Therefore, a plastic is fundamentally a very suitable material for this application. In order to achieve sufficient rigidity for the transmission of tensile forces, while at the same time lose flexibility for a driving on the spring element 18, cross-sectional conditions are determining.
• a band cross section of the tension band 30 must be very flat in height and long in the width.
• a rectangular cross-section with an aspect ratio of 1:10 was combined with a substantially circle-like - lo chen, in particular circular, medium fiber chosen (see Figures 7a to 7c), but it can also 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 be beneficial.
• the substantially circle-like, in particular circular portion serves to fill the mold in the manufacturing process and at the same time advantageously increases the strength.
• a buffer is created by the installation situation in the slide valve 66, which can compensate for any blurring of manufacture and mechanical behavior of the tension band 30, which is made of plastic.
• the drawstring 30 must have a body for receiving the compensation spring 68 and safely taken up with the help of two rotational recordings in the slide valve 66 / performed.
• the slide valve 66 supports the compensation spring 68 on the opposite side and determines the measure of the compensation over the installation length.
• the path from the slide valve 66 is now transmitted force-dependent on the drawstring 30 and the switch actuator 24 (see Figures 8a and 8b).
• the coupling is no longer rigid but linear-elastic.
• the paths between the slide valve 66 and switching lever on the switch actuator 24, which forms a hammer switch, are designed so that in the compensation spring 68 is always a
• Reserved reserve This reserve from the length of the compensation spring 68 in operation can be used for tolerance compensation and compensation of thermal, elastic as well as plastic changes in length on the drawstring 30, which is made of plastic. An overload protection is ensured and tensile forces are now applied to the tension band 30 via the compensation spring 68.
• the labyrinth 70 engages the transitions into the surrounding parts and, especially during the switchover of the switch actuator 24 formed by the hammer switch, effectively ensures dust protection and safe operation. Additional sealing elements are not required.
• Another aspect of the invention relates to the fact that for larger and more powerful hand tool machines 10, such as e.g. in heavy drilling and
• the above-described fixation 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 have to be introduced between the machine housing 20 and the leaf spring 32 in order to prevent the too soft leaf spring 32 in its ih- to support spring action.
• the secondary spring elements 34 are each formed by an elastomeric spring element 36.
• the leaf spring can be acted upon by a clamping piece and the screw plate only on the back side functionally or with forces. On the side of the leaf spring facing the device side, no holding or fixing functions or forces can be introduced.
• the invention thus represents an extension of the known from the document DE 10 2006 029 630 A1 solution to implement the presented there anti-vibration handle concept even with larger and more powerful hand tool machines can.
• the operator-held anti-vibration handle 58 includes the switch actuator 24 formed as an on-off switch, and is closed by screwing a handle of the anti-vibration handle 58 backward.
• the leaf spring 32 is clamped between the anti-vibration handle 58 and two screw plates 48.
• the two screw plates 48 are pushed in the transverse direction on both sides of the leaf spring 32.
• the screw plates 48 thus enclose an upper clamping region 50 of the leaf spring 32 up to the contact zone to the anti-vibration handle 58 in all spatial directions. This ensures a durable and stable enclosure of the leaf spring 32.
• screw dome 52 which serve for screwing the screw 48 and thus one of the leaf spring 32 with the anti-vibration handle 58.
• the screw 48, the leaf spring 32, the anti-vibration handle 58 and a strained bellows 72 form a fastening system, which is held together advantageously on form and frictional connection.
• the positive connection is formed by mutually supporting and penetrating retaining domes and ribs, so that the adhesion has only a fixing function and the essential forces are absorbed by the positive connection of the components.
• a significant advantage of the screw plates 48 pushed on both sides is the provision of additional functional surfaces in front of a region and laterally of a region of the screw plates 48 of the leaf spring 32.
• the screw plates 48 are formed so that they can accommodate the additional secondary spring elements 34. In addition to spring shots have the screw 48 even more features.
• the screw plates 48 In order to prevent tearing out of the anti-vibration handle 58 and thus also overloading of the leaf spring 32, the screw plates 48 have lateral abutment 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 back stop.
• Another function of the screw 48 is the lateral guiding and covering the control means 28 formed by the tension band 30 relative to that of a
• Tieback 30 must be able to slide smoothly on the leaf spring 32 and must not be jammed or pinched.
• Bellows 72 is chambered by the screw plates 48 in the anti-vibration handle 58. Furthermore, the screw 48 also form the end stop in the longitudinal and vertical direction of the anti-vibration handle 58.
• the lower Blattfederklemmung is in the screw system of the back plates
• the previously one-piece backplate was split into two mirror-symmetrical backplates 38 in order to fulfill all required functions, favorable mountability and mold endformability.
• the bellows 72 already mounted on the anti-vibration handle 20 and the rocker arms (not shown) are chambered during assembly by pushing the two back plates 38 together. Due to the required bias of the leaf spring 32, the leaf spring 32 is then a bit of the back plates designed as housing rear plates 38 from.
• a spring plate 40 is inserted above with its two retaining ribs 42 in two corresponding retaining grooves 44 formed as housing rear plates back plates 38 and then folded against a leaf spring tension in the direction of the back plates 38 to the rear , In order to hold this position, two are in the back plates 38
• Snap hook 46 integrates, which engage in the spring plate 40 and these in the Keep assembly position.
• the thus pre-assembled complete, designed as a handle assembly handle device can then be applied in an assembly line on the core device.
• the leaf spring 32 For clamping the leaf spring 32 both positive and positive elements are used. As a positive connection, the leaf spring 32 has at its lower end two openings and a Abfalzung 74.
• the leaf spring 32, the spring plate 40 and the machine housing 20 are threaded onto two domes of the respective side of the back plates formed by the housing rear plates 38. Furthermore, the spring plate 40 engages around the two screw domes of the machine housing 20.
• the Abfalzung 74 of the leaf spring 32 is clamped between the back plates 38 and the spring plate 40.
• the spring plate 40 is designed in its contour height so that the leaf spring 32 is firmly clamped down to about 25% of its length. The remaining length can cantilever freely during compression.
• 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 acted upon only after a certain compression travel.
• FIG. 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 which surround the leaf spring 32, are designed to receive the one or the additional secondary spring elements 34 can.
• a foamed elastomer molded part between the screw plate 48 or the leaf spring 32 and the spring plate 40 is introduced.
• the elastomeric molded part is formed as the elastomeric spring element 36 and forms the secondary spring element 34.
• Foamed elastomer moldings have the advantage of cost-effective production by a continuous extrusion molding process with subsequent cutting to the required length. Furthermore, they act in virtually all directions, ie they have no preferred direction such as a helical compression spring.
• the advantageous, formed as Elastomerfederelement 36 secondary spring element 34 supports the leaf spring 32 at loads that are above an optimal Radio Santikticians.
• the optimum operating pressure point is the minimum pressure that the operator just has to provide in order for the hand tool 10 formed by the hammer to perform a regular and clean impact operation. This operating pressure is dependent on the power class of the power tool 10 and the particular application.
• the spring stiffness of the leaf spring 32 is adjusted so that with a compression travel between 2 mm and 10 mm, preferably between
• Elastomer spring element 36 is compressed to 70% of its original volume. With further compression of 1 mm to 2 mm, almost the entire volume of
• Elastomer spring member 36 is applied, so that the spring stiffness relatively quickly increases. This has the advantage that in a case on the anti-vibration handle 58 a lot of energy can be absorbed, so that the impact-like components are less loaded. A described compression characteristic can also be effected or supported by a targeted shaping of the elastomer spring element 36. It is thus also possible to install tubular or other contours that can be produced in an extrusion process.
• the elastomer spring element 36 is preferably made of foamed elastomer (sponge rubber), which is produced in a continuous extrusion molding process with subsequent cutting to length.

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Citations (8)

Family Cites Families (7)

• 2011
  • 2011-09-02 DE DE102011082093A patent/DE102011082093A1/de not_active Withdrawn
• 2012
  • 2012-08-31 WO PCT/EP2012/067034 patent/WO2013030380A1/de unknown
  • 2012-08-31 WO PCT/EP2012/067036 patent/WO2013030382A1/de unknown
  • 2012-08-31 CN CN201280042543.9A patent/CN103796800B/zh active Active
  • 2012-08-31 EP EP12809620.3A patent/EP2750837B1/de active Active
  • 2012-08-31 CN CN201280042590.3A patent/CN103781597A/zh active Pending
  • 2012-08-31 EP EP12790435.7A patent/EP2750836B1/de active Active
  • 2012-08-31 EP EP12797722.1A patent/EP2750834B1/de active Active
  • 2012-08-31 WO PCT/EP2012/067030 patent/WO2013030377A1/de unknown
  • 2012-08-31 CN CN201280042520.8A patent/CN103764350B/zh active Active
  • 2012-08-31 EP EP12783534.6A patent/EP2750835B1/de active Active
  • 2012-08-31 WO PCT/EP2012/067035 patent/WO2013030381A1/de unknown

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