Handheld power tool, fanless power supply unit and tool system

• US 10,569,407 B2
• Filed: 11/30/2015
• Issued: 02/25/2020
• Est. Priority Date: 12/01/2014
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Meixner, Ralf, Cecchin, Holger, Ziegler, Bernd
• Primary Examiner(s): Chukwurah, Nathaniel C
• Application Number:
  US15/531,977
• Publication Number:
  US 20170334055A1
• Time in Patent Office: 1,548 Days
• Field of Search: 173217, 173 48, 173109, 173201
• CPC Class Codes: B25D 16/00 Portable percussive machines with superimposed rotation , the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit combined percussion and rotary drilling adapted for earth drilling E21B6/00
• CPC Class Codes: B25D 17/20 Devices for cleaning or cooling tool or work
• CPC Class Codes: B25D 2217/0061 related to cooling
• CPC Class Codes: B25F 5/008 Cooling means

Abstract

A hand-held power tool, in particular a hammer drill or combination hammer, is disclosed. The power tool includes a tool housing which has a receiving recess designed to replaceably receive a storage battery or a power supply unit. The hand-held power tool further includes an electric drive motor having a cooling fan and a first vent portion which is located on the tool housing outside the receiving recess and through which a volume flow generated by the cooling fan can be guided. The tool housing has a second vent portion which is different from the first vent portion and which is located in the receiving recess and through which the volume flow generated by the cooling fan can be at least partially guided.

Claims

1. A handheld power tool, comprising:

a tool housing, wherein the tool housing has a receiving recess and wherein a storage battery or a power supply unit is replaceably receivable in the receiving recess;

an electric drive motor with a cooling fan;

a first vent section disposed on the tool housing outside of the receiving recess, wherein a volume flow generated by the cooling fan is guidable through the first vent section; and

a second vent section that differs from the first vent section, wherein the second vent section is disposed within the receiving recess and wherein the volume flow is at least partially guidable through the second vent section;

wherein a closed-surface storage battery held in the receiving recess seals the second vent section.

2. The handheld power tool according to claim 1, wherein the handheld power tool is a hammer drill or a combination hammer.

3. The handheld power tool according to claim 1, wherein the first vent section and the second vent section belong to different vents.

4. A handheld power tool, comprising:

a tool housing, wherein the tool housing has a receiving recess and wherein a storage battery or a power supply unit is replaceably receivable in the receiving recess;

an electric drive motor with a cooling fan;

a first vent section disposed on the tool housing outside of the receiving recess, wherein a volume flow generated by the cooling fan is guidable through the first vent section;

a second vent section that differs from the first vent section, wherein the second vent section is disposed within the receiving recess and wherein the volume flow is at least partially guidable through the second vent section; and

a flow control device, wherein the flow control device distributes the volume flow between the first vent section and the second vent section.

5. The handheld power tool according to claim 4, wherein the flow control device is an externally operated change-over gate which in a first switch position seals the first vent section and which in a second switch position seals the second vent section.

6. A fanless power supply unit for a handheld power tool which has a receiving recess for replaceably holding the fanless power supply unit and an electric drive motor with a cooling fan, comprising:

an inner ventilation channel open to the environment, wherein the fanless power supply unit is force-coolable by a volume flow generated by the cooling fan of the handheld power tool flowing through the inner ventilation channel when the fanless power supply unit is held in the receiving recess of the handheld power tool; and

a sealing element, wherein the sealing element at least partially seals a first vent section disposed outside of the receiving recess of the handheld power tool when the fanless power supply unit is held in the receiving recess.

7. The fanless power supply unit according to claim 6, wherein the sealing element is a projecting sealing plate that covers the first vent section.

8. The fanless power supply unit according to claim 6, wherein the sealing element is a slide element, wherein the slide element switches over an externally operated change-over gate provided in the handheld power tool from a second switch position into a first switch position such that a second vent section disposed within the receiving recess of the handheld power tool is opened.

9. A tool system, comprising:

a handheld power tool, wherein the handheld power tool includes;

a tool housing with a receiving recess;

an electric drive motor with a cooling fan;

a first vent section disposed on the tool housing outside of the receiving recess, wherein a volume flow generated by the cooling fan is guidable through the first vent section;

a second vent section that differs from the first vent section, wherein the second vent section is disposed within the receiving recess and wherein the volume flow is at least partially guidable through the second vent section; and

a flow control device, wherein the flow control device distributes the volume flow between the first vent section and the second vent section; and

a fanless power supply unit receivable within the receiving recess, wherein the fanless power supply unit includes an inner ventilation channel open to the environment and wherein the fanless power supply unit is force-coolable by the volume flow flowing through the inner ventilation channel when the fanless power supply unit is held in the receiving recess.