Spray Handle Head Integrating Throttle and Stop Controls
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Solution Overview
Problem
Portable spraying devices for plant protection require improved ergonomic design to simplify handling, as existing configurations limit control element placement due to size constraints, necessitating frequent hand movement or use of the other hand to operate multiple functions.
Innovation Solution
The handle features a handle head with integrated throttle control, stop switch, and actuating element for the control valve, allowing all functions to be accessed without repositioning the hand, including a spring-loaded linear valve for precise spraying agent control and a pivot lever for dual-function stop and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is designed with limited size for ergonomic gripping, then the ergonomic quality is improved, but the space for control elements becomes insufficient
Solution Approach 1:
The patent extends the handle structure by adding a handle head that projects beyond the gripping area in longitudinal direction. This dimensional extension provides additional space for mounting control elements (throttle control, stop switch, actuating element) without increasing the transverse dimensions that would compromise ergonomic gripping. The handle head serves as a separate functional zone that does not interfere with the gripping area.
2Adaptability or versatility
If control elements are distributed on different locations (handle, carburetor, control valve), then the functional distribution is improved, but the operation complexity increases due to frequent hand movement
Solution Approach 1:
The patent consolidates all three control elements (throttle control, stop switch, and actuating element for control valve) onto the handle head. This merging of control functions into a single location allows the operator to access and operate all controls without moving the hand to different locations on the device, thereby reducing operation complexity while maintaining functional distribution.
Solution Approach 2:
The handle head serves multiple functions: it provides the gripping surface, mounts the throttle control, accommodates the stop switch, and supports the actuating element. This multi-functional design consolidates control operations in one universal interface, improving ease of operation without sacrificing functional versatility.
3Area of stationary object
If the handle head projects past the gripping area to accommodate control elements, then the space for controls is improved, but the handle structure becomes more complex
Solution Approach 1:
The handle is segmented into distinct functional zones: the gripping area for hand placement and the handle head for control elements. This segmentation allows each zone to be optimized independently - the gripping area maintains ergonomic dimensions while the handle head extends to provide sufficient space for controls, reducing structural complexity through functional separation.
Data Source
AI summary
A portable spraying device has an internal combustion engine and a blower driven by the internal combustion engine. A blower tube is connected to the blower and conveys a blowing air stream generated in the blower. A spraying agent reservoir is provided and a spraying agent line is connect to the reservoir and conveys a spraying agent stream from the reservoir into the blowing air stream. A control valve is arranged in the spraying agent line. A throttle control acts on the internal combustion engine for controlling an engine output. A stop switch acts on the internal combustion engine for interrupting ignition. An actuating element acts on the control valve for actuating the control valve to control the spraying agent stream. A handle with a handle head is provided and the throttle control, the stop switch, and the actuating element are arranged in the handle head.