Impact Tool Hammer Casing Integration
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Solution Overview
Problem
Existing impact tools have a complex assembly structure that increases the number of parts, making them difficult to assemble and disassemble, and they are not easily downsized, which affects operability in narrow spaces.
Innovation Solution
An impact tool design featuring a housing body with a recess, a motor, a hammer casing with an integrated disk-shaped member that supports the spindle and closes its rear end, and engagement members that restrict movement and rotation, reducing the number of parts and enhancing assembly workability while preventing parts from falling out during disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal gear casing and hammer casing are separately fixed on the housing body with screws, then the fixation is achieved, but the number of parts increases and assembling work becomes troublesome
Solution Approach 1:
The patent merges the fixation function into the hammer casing itself by providing a fixation protrusion that engages with a fixation recess in the housing body. This integrates the fixation mechanism with the hammer casing structure, eliminating the need for separate fixation screws and reducing the total number of parts while maintaining reliable fixation.
2Device complexity
If the internal gear casing is covered with the hammer casing, then the structure is compacted, but it becomes difficult to downsize the hammer casing and operability in narrow spaces deteriorates
Solution Approach 1:
The patent segments the hammer casing into a main body and a separate rear end portion that can be opened. This segmentation allows the rear end to be accessed and removed independently, providing operational access in narrow spaces while maintaining the compact overall structure when closed.
3Ease of operation
If the hammer casing is opened at the rear end for access, then operability is improved, but parts may fall out during disassembly for maintenance
Solution Approach 1:
The patent provides a cover for the rear end opening that can be attached before disassembly for maintenance. This cover prevents parts from falling out during the disassembly process while still allowing access to the interior when needed, as the cover can be removed and reattached.
4Stability of the object's composition
If multiple engagement members are used to restrict hammer casing movement, then movement control is precise, but the number of parts increases
Solution Approach 1:
The patent combines multiple engagement functions into integrated engagement members. The first engagement member restricts movement in one direction while the second engagement member restricts movement in another direction, with both integrated into the hammer casing structure. This reduces the number of separate parts while maintaining precise movement control in multiple directions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design simplifies the assembly of the hammer casing, reduces the number of parts, prevents parts from falling out during maintenance, and allows for downsizing, thereby improving operability and workability in confined spaces.
Implementation Method 1
The hammer is urged toward the anvil by a coiled spring
Implementation Method 2
a spindle operable to rotate to transmit a power from an output axis of the motor by way of a planetary reduction gear mechanism
Data Source
AI summary
An impact tool includes a motor, a hammer casing with an opened rear end and a disk-shaped member coupled to the hammer casing to close the opened rear end and to rotatably support a spindle. A first engagement member is formed on an outer face of the disk-shaped member. A second engagement member is formed on an inner face of the recess and engaging with the first engagement member to restrict a movement of the hammer casing in a second direction parallel to a rotation axis of the spindle. A third engagement member is formed on an outer face of the hammer casing. A fourth engagement member is formed on an inner face of the housing body and engaging with the third engagement member so as to restrict a movement of the hammer casing in the first direction.