| 摘要 |
A truss screed includes a shaft guard that covers the screed's exciter shaft to protect it from concrete and debris and that protects the surroundings from the rotating exciter shaft. The shaft guard includes a plurality of tubing sections that surround the shaft and that are supported on joints disposed between the guard sections. In a first preferred embodiment of the shaft guard, each joint includes a resilient spring ring, a support cup that receives the spring ring and an end of an associated tubular section, and a bearing that engages the support cup and that supports the joint and a portion of the exciter shaft on the screed's frame. In a second preferred embodiment, each joint includes a support cup that supports an end of the associated tubular section, a bearing, and a U-shaped bracket that couples the support cup to the bearing. The bearing and/or the bracket have elongated slots therethrough for accommodating misalignment of joint components. Joints located at a juncture between adjacent screed sections also include a cup guide that bears the associated support cup while permitting limited tilting movement of the support cup relative to the bearing. Hence, both types of joint accommodate component misalignment, provide an at least limited seal, and permit adjustment of the angular orientation of adjacent screed sections relative to one another.
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