Jigsaw Transmission Link Guide Torque and Dust Control
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Solution Overview
Problem
Existing saber saws have complex and cost-intensive constructions, and they lack adequate protection against dust ingress, which leads to performance reductions or failure when processing mineral materials due to dust deposits on critical components.
Innovation Solution
The saber saw design incorporates a link guide and adjustable pivot points to efficiently transmit torque, reduce dust ingress through motor insulation, and feature a resiliently mounted link lever to minimize impacts and allow sintered teeth, enhancing durability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a complex drive mechanism with multiple components (swash plate device, piston, connecting rods) is used to achieve reciprocating motion, then the saw blade can be driven effectively, but the device complexity increases and cost increases
Solution Approach 1:
The drive mechanism is segmented into modular components: an electric motor drives a crankshaft that is separably connected to a connecting rod, which in turn connects to the saw blade holder. This segmentation allows for simplified assembly and maintenance while reducing overall complexity compared to integrated swash plate mechanisms.
Solution Approach 2:
The patent replaces complex mechanical transmission systems (swash plate devices, multiple connecting rods) with a simpler crankshaft-connecting rod mechanism directly coupled to an electric motor. This substitution maintains effective reciprocating motion while significantly reducing device complexity and component count.
2Ease of operation
If multiple openings are provided in the housing for access and operation, then the saber saw is easier to operate and maintain, but dust ingress increases
Solution Approach 1:
The housing incorporates flexible sealing elements and gaskets around openings and moving parts. These flexible seals allow for operational access while maintaining dust protection, creating a barrier that adapts to movement while preventing particle ingress into the drive mechanism.
Solution Approach 2:
Sealing elements and protective covers act as intermediaries between the external environment and the internal drive mechanism. These intermediaries allow necessary access for operation while filtering and blocking dust particles from reaching critical components like the crankshaft and connecting rod.
3Adaptability or versatility
If dust deposits settle on sleeve bearings and critical components, then the saber saw can operate in harsh environments, but performance reduction and failure occur
Solution Approach 1:
The patent extracts and isolates critical drive components (crankshaft, connecting rod, saw blade holder) within a protected housing environment. This extraction separates the precision mechanical components from direct exposure to dust-laden environments, allowing the saw to operate in harsh conditions without contaminating the drive mechanism.
Solution Approach 2:
Protective sealing elements and dust-resistant coatings are applied to critical components and housing openings. These protective films prevent dust deposition on sleeve bearings and moving parts, maintaining component performance and reliability even during operation in environments with high dust concentrations.
4Reliability
If a resiliently mounted link lever is used to minimize impacts, then durability increases, but the device complexity increases
Solution Approach 1:
The link lever is mounted with resilient elements (rubber dampers, spring isolators) that provide beforehand cushioning against impact loads during operation. This prior cushioning protects the mounting points and reduces stress on the crankshaft and connecting rod, enhancing durability through simple isolating elements rather than complex active damping systems.
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 improves the saber saw's efficiency and durability by reducing dust-related issues, enhancing the transmission of torque, and allowing for adjustable oscillating movements, resulting in improved performance and reduced maintenance costs.
Implementation Method 1
a first articulated rod (40) with a pivot point (42) and a connection point (44) and a second articulated rod (50) with a first pivot point (52) and a second pivot point (54), wherein the pivot point (42) of the first articulated rod (40) is rotatably connectable to the drive point (69) of the lifting rod (60) and the connection point (44) of the first articulated rod (40) is connected to the drive and rotatably connected
Implementation Method 2
the pivot point (42) of the first articulated rod (40) is rotatably connectable to the drive point (69) of the lifting rod (60)
Implementation Method 3
a resiliently mounted link lever to minimize impacts
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Reciprocating saw (1) for machining a workpiece, in particular a mineral or metallic workpiece, comprising a drive (20) and a stroke rod (60) having a first stroke rod end (63), a second stroke rod end (68) and a drive point (69). Furthermore, a first articulated rod (40) having a pivot point (42) and a connecting point (44) and a second articulated rod (50) having a first pivot point (52) and a second pivot point (54) are provided, wherein the pivot point (42) of the first articulated rod (40) can be rotatably connected to the drive point (69) of the stroke rod (60), and the connecting point (44) of the first articulated rod (40) can be connected to the drive (20) for conjoint rotation therewith by means of a connecting device (70), and wherein the drive (20) can be positioned at least partially in a drive housing.