Classifications

• • 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
  • 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
• • 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

Definitions

• the present invention relates to a power tool arrangement comprising an electric drive unit for a tool accommodated in a housing of a power tool and switchable via an operating switch, as well as a connection interface for detachably attaching an accessory to the housing of the power tool.
• the field of application of the invention extends primarily to metal-cutting power tools, such as drills, hammer drills, and the like.
• a variety of accessories are typically offered for such power tools, which can usually be mechanically and/or electrically connected to the power tool via an open connection interface.
• Such accessories can include, for example, vacuum cleaner units, air blower units, measuring devices, and the like. Whether or not an accessory is used depends on the user of the power tool.
• a generic accessory for a power tool emerges, here in the form of a vacuum unit for a handheld drilling tool.
• the accessory has a suction head that can accommodate a tool rotatable about a tool axis.
• a blower is provided, with a fan wheel rotatable about a fan axis for sucking air from the suction head, which is connected to the housing by an intake duct, which runs in a first section along the longitudinal axis of the suction module and in a second section along a vertical axis of the suction module that is transverse to the longitudinal axis.
• the suction module can be releasably attached below the power hand tool via a connecting interface formed correspondingly on the respective housings.
• connection interface is equipped with locking means for preventing operation of the power tool without an attached accessory.
• the locking means designed according to the invention can be implemented as a mechanical or electronic solution. Within the framework of a mechanical solution, the locking means can be integrated into the power tool and the accessory or arranged externally, as will be described in more detail below.
• the solution according to the invention thus makes it possible to enforce the use of an accessory on power tools.
• the locking means between the power tool and the accessory can be equipped with mechanical or electrical detection means for recognizing the connection status of the accessory as “connected” or “not connected”, whereby associated operation interruption means for forced control only allow the drive unit to be switched on via the power tool's operating switch if the accessory has been recognized as "connected” by evaluating the connection status.
• the advantage of the electronic solution is that the power tool assembly automatically registers whether a mandatory accessory is connected and can only be operated if it is properly connected to the power tool. If the accessory is not connected to the power tool, the tool will not start or will stop operating as soon as the accessory is disconnected. Implementing this technical solution requires relatively little effort in a conventional power tool assembly and can also be retrofitted.
• the alternative mechanical solution can be implemented internally or externally.
• the locking means with a locking device integrated into the housing with release locking means.
• An integrated locking device can, for example, be designed in the manner of a built-in lock operable with a key or screwdriver, which is preferably implemented on the part of the accessory and interacts positively with a housing molding or the like on the part of the power tool's housing.
• the locking means may be configured as an external locking device, for example, in the manner of a padlock with a key as the release locking means.
• a seal for example, could also be considered, which at least creates a barrier to unauthorized removal of the accessory. Breaking a seal can result in liability for unauthorized use being transferred to the responsible user.
• release locking means to be configured electrically or electronically, for example in the form of an electromagnet or the like.
• the alternative electronic interruption means for the forced control of the operation of the power tool can also be designed in different ways.
• the interruption means in the manner of an electrical switch or as a mechanical actuation lock for the operating switch.
• a push-button switch electrically connected in series with the operating switch can be provided, which closes when a coupling of the accessory to the power tool is detected in the retracted push-button position.
• a conventional Microswitches can be used.
• a mechanical actuation lock it is possible, for example, to use a locking mechanism to block the pressing of the power tool's operating switch if a corresponding interface-side plunger does not detect a coupled accessory.
• electrical detection means such as an electrically inductive proximity sensor for detecting an accessory mounted at the connection point
• electrical detection means such as an electrically inductive proximity sensor for detecting an accessory mounted at the connection point
• the inductive proximity sensor can, for example, be installed on the power tool side in the area of the connection interface and interact with a metal element arranged in or on the housing of the accessory.
• connection interface comprises a mechanical sliding interface or a clip connection between the housing of the power tool and a housing of the accessory.
• a power tool 1 here designed as a hammer drill, comprises a drive unit 4 for a tool 5, which is designed here as a drill and can be switched on via an operating switch 2.
• An accessory 6, designed as a vacuum cleaner unit, is coupled via an outer housing 7 to the housing 3 of the power tool 1 by means of a connection interface 8, which is designed here as a sliding interface.
• an electrical switch 9 is placed in the area of the connection interface 8 as a means of interrupting operation. Its mechanical actuating button detects an accessory 6 attached to the power tool 1, whereupon the electrical switch 9 moves into the closed position. Since the electrical switch 9 is connected in series with the operating switch 2 of the power tool 1, this forms the prerequisite for switching on the power tool 1 via the operating switch 2 in order to activate the electric drive unit 4. In this exemplary embodiment, the evaluation of the connection status as "connected" is therefore carried out via the logic of the series connection of two electrical switches.
• the electrical switch 9 opens, which prevents the power tool 9 from being switched on via the operating switch 2 within the scope of the forced control according to the invention.
• Fig. 2 As an example of an integrated mechanical locking device, the electric hand tool 1 with a coupled accessory 6 at the connection interface 8 with a locking device 10 integrated into the housing equipped.
• a mechanical key is used here as a release locking device, which is only accessible to authorized persons.
• integrated operation interruption means are closed via their detection means - similar to the embodiment described above - which, within the scope of the positive control, only allows operation of the power tool 1 with the accessory part 6.
• the accessory part 6 is also a vacuum cleaner unit, which removes dust and particles generated by the tool 5 into a collection container 13 via an intake channel 11 and distal suction head 12.
• the Fig. 3 shows an embodiment as an example for external mechanical locking means.
• an external locking device 14 in the manner of a padlock is provided, which interacts with eyelet-like recesses formed on both sides of the housing (not shown in detail here).
• the release locking means are designed as keys.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Portable Power Tools In General (AREA)
• Electric Vacuum Cleaner (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=90826254

Family Applications (1)

Country Status (2)

Citations (5)

• 2024
  • 2024-04-19 EP EP24171293.4A patent/EP4635682A1/fr active Pending
• 2025
  • 2025-04-04 WO PCT/EP2025/059234 patent/WO2025219108A1/fr active Pending

Patent Citations (5)

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