Excavation Tool Locking Pin Retention Mechanism
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Solution Overview
Problem
Existing excavation tools face issues with the locking pin not being firmly fixed, leading to potential detachment during impact or insertion/removal, which can suspend excavation work.
Innovation Solution
The excavation tool incorporates a rigid fixing member that abuts the locking pin and a locking portion to prevent movement, with an optional auxiliary member maintaining engagement to prevent coming-off, ensuring the locking pin remains securely in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking pin is used to retain the bit head, then the bit head can be fixed to the device, but the locking pin may come off during excavation due to impact or repulsion
Solution Approach 1:
The patent applies beforehand cushioning by providing a retaining means (such as a retaining groove or retaining structure) in advance on the device or locking pin. This retaining structure is designed to accommodate and prevent the locking pin from coming off during excavation operations, thereby cushioning against the harmful effects of impact and repulsion forces that occur during normal use.
2Reliability
If elastic members are used to retain the locking pin, then the locking pin can be fixed, but the locking pin may not be firmly fixed due to elastic deformation under impact
Solution Approach 1:
The patent employs a retaining structure that is designed to be simple and robust rather than relying on elastic members. The retaining means (such as a retaining groove or retaining protrusion) provides a permanent, non-deformable solution that maintains its fixation strength under impact conditions, eliminating the weakness of elastic deformation associated with elastic members.
3Ease of operation
If the locking pin is freely movable in the pin hole, then insertion and removal is easy, but the locking pin can be pushed out in the insertion/removal direction
Solution Approach 1:
The patent segments the pin hole into different functional zones: an insertion/removal portion that allows easy insertion and removal operations, and a retaining portion (such as a retaining groove or locked position) that prevents the locking pin from being pushed out during normal operation. This segmentation enables the locking pin to be easily installed and removed when needed, while maintaining position stability during excavation operations.
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 solution effectively prevents the locking pin from moving or coming off during excavation, even under impact, ensuring continuous operation and reliable fixation without significant elastic deformation.
Implementation Method 1
a fixing member which is a rigid body and abuts on the end face of the locking pin to fix the locking pin
Implementation Method 2
a locking portion which locks the fixing member in the extension direction of the pin hole to fix the fixing member
Implementation Method 3
an auxiliary member which maintains an engagement state between the fixing member and the locking portion
Data Source
AI summary
Provided is an excavation tool which can firmly fix a locking pin so that the locking pin does not move even in the case of an impact during excavation and/or the locking pin being pushed out in the insertion/removal direction.The excavation tool (10) includes a tool body (20) having an attaching hole (32) and an attaching member (40).The attaching member (40) is provided with an attaching shaft (45) inserted into the attaching hole (32), and the outer peripheral surface of the attaching shaft (45) is provided with a groove (46) which crosses the extension direction of the attaching shaft (45).The tool body (40) is provided with a pin hole (33) extending in a direction crossing the extension direction of the attaching hole (32). A part of the pin hole (33) passes through the attaching hole (32).A locking pin (56), which can engage with the groove (46) of the attaching shaft (45) inserted into the attaching hole (32), is inserted into the pin hole (33). An opening of the pin hole (33) is provided with a fixing member (50) which is a rigid body and abuts on the end face of the locking pin (56) to fix the locking pin, anda locking portion (57) which locks the fixing member (50) in the extension direction of the pin hole (33) to fix the fixing member.