Wagtail
Super Star Member
- Joined
- Jan 15, 2013
- Messages
- 12,685
- Location
- St Helens, Tasmania, Australia
- Tractor
- JD 4105 / JD Z355E (48" deck)
Putting some 'over-night' thought to the situation... I put it to the discussion that, whilst the installed seat belt mechanism worked as designed, perhaps the latching/buckle system is the wrong type for tractor applications.
Generally a tractor seat belt does two things: both keeping the operator in the seat. One deals with the up/down/'jouncing' of going over rough terrain and the other is keeping the operator in place during a roll onto its side (due to ROPS).
In the former situation (bouncing around) a standard vehicle seat belt configuration works fine.
In the latter situation and due to an operators weight putting full force onto the latching mechanism, it is very difficult to release unless the tension of the weight is eased. In other words, the operator cannot apply sufficient pressure on the 'button' to overcome the tension holding the buckle together.
The only type of 'practical' ($) buckle (that I can think of) would be a lever type of locking mechanism; such as what is employed on passenger aircraft seats or what was used when safety belts were first introduced in cars. A lever would be able to apply more force to unlock in a roll onto your side situation.
Generally a tractor seat belt does two things: both keeping the operator in the seat. One deals with the up/down/'jouncing' of going over rough terrain and the other is keeping the operator in place during a roll onto its side (due to ROPS).
In the former situation (bouncing around) a standard vehicle seat belt configuration works fine.
In the latter situation and due to an operators weight putting full force onto the latching mechanism, it is very difficult to release unless the tension of the weight is eased. In other words, the operator cannot apply sufficient pressure on the 'button' to overcome the tension holding the buckle together.
The only type of 'practical' ($) buckle (that I can think of) would be a lever type of locking mechanism; such as what is employed on passenger aircraft seats or what was used when safety belts were first introduced in cars. A lever would be able to apply more force to unlock in a roll onto your side situation.