Power tool

Patent metadata

Field	Value
Publication number	US-12350808-B2
Application number	US-202318368593-A
Country	US
Kind code	B2
Filing date	Sep 15, 2023
Priority date	Mar 15, 2021
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A power tool including a primary housing and a motor assembly connectable to a cutting tool. The motor assembly is configured to drive the cutting tool. A secondary housing is mounted within the primary housing. At least one first dampening system is coupled between the primary housing and the motor assembly. At least one second dampening system is coupled between the primary housing and the secondary housing. The at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly.

First claim

The invention claimed is:

1. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly, and
wherein operation of the at least one second dampening system is independent of the operation of the at least one first dampening system.

2. A power tool according to claim 1 , wherein the at least one first dampening system is configured to move with respect to the primary housing along a longitudinal axis of the power tool.

3. A power tool according to claim 1 , wherein the at least one second dampening system is configured to move with respect to the secondary housing substantially parallel to a longitudinal axis of the power tool.

4. A power tool according to claim 1 , wherein the cutting tool is configured to reciprocate along a tool axis and the at least one first dampening system and the at least one second dampening system are configured to move in a direction substantially parallel with the tool axis.

5. A power tool according to claim 1 , wherein the at least one second dampening system comprises a moveable bracket fixed to the secondary housing.

6. A power tool according to claim 5 , wherein the at least one second dampening system comprises a fixed bracket mounted to the primary housing and the moveable bracket is moveably mounted to the fixed bracket.

7. A power tool according to claim 6 , wherein one or more components mounted on the secondary housing project towards the fixed bracket.

8. A power tool according to claim 5 , wherein the moveable bracket comprises at least one guide element arranged to limit the movement of the moveable bracket.

9. A power tool according to claim 8 , wherein the at least one guide element comprises a peg movable within a slot.

10. A power tool according to claim 5 , wherein the at least one second dampening system comprises at least one vibration dampening element coupled to the movable bracket.

11. A power tool according to claim 10 , wherein the at least one vibration dampening element comprises at least one of a compression spring, a leaf spring, foam pad, rubber pad, and a silicone pad.

12. A power tool according to claim 1 , wherein at least one gripping handle is mounted to the primary housing.

13. A power tool according to claim 1 , wherein at least one of the at least one first and the at least one second dampening systems are spring mass systems.

14. A power tool according to claim 1 , wherein the motor assembly is a motor driven hammer assembly.

15. A power tool according to claim 1 , wherein the power tool is a demolition hammer, hammer drill, rotary hammer or a chipping hammer.

16. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly, and
wherein the at least one second dampening system is configured to reduce vibrations in the secondary housing generated by the motor assembly when at least one first dampening system is inoperable.

17. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly, and
wherein the at least one first dampening system and the at least one second dampening system are tuned to substantially the same vibration frequency.

18. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly, and
wherein the secondary housing is mounted on a side of the primary housing.

19. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly, and
wherein the secondary housing is a tray comprising at least one controller circuit configured to send control instructions to the motor assembly.

20. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by the motor assembly, and
wherein at least one of the at least one first and the at least one second dampening systems are configured to reduce vibrations in the secondary housing generated by the motor assembly in three perpendicular directions.

21. A power tool comprising:
a primary housing;
a motor assembly connectable to a cutting tool, the motor assembly configured to drive the cutting tool;
a secondary housing mounted within the primary housing;
at least one first dampening system coupled between the primary housing and the motor assembly; and
at least one second dampening system coupled between the primary housing and the secondary housing,
wherein the at least one first dampening system and the at least one second dampening system are configured to reduce vibrations in the secondary housing generated by th

Assignees

• Black & Decker Inc

Inventors

• Herdling Andre
• Langhammer Heiko
• Thieme Rene

Classifications

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B25D17/24

  Damping the reaction force {(resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966)} · CPC title

• B25D17/06

  Hammer pistons; Anvils {; Guide-sleeves for pistons} · CPC title

• E01C23/124

  moved rectilinearly, e.g. road-breaker apparatus with reciprocating tools, with drop-hammers · CPC title

• B25D2250/371

  Use of springs · CPC title