The purpose of the utility model is to put forward a kind of expansion bolt with good fixing effect. The expansion bolt of the utility model comprises an expansion sleeve and the bolt, the bolt is installed on the expansion sleeve, the bolt is located in the end of the expansion sleeve is a cone shaped or cone shape; the key lies in the expansion of the barrel wall of the sleeve barrel multiple from outer to inner curved to form concave salient point. At the time of installation, first using the bit on the wall through a predetermined depth and diameter of the hole, and then the expansion sleeve into the hole, the bolt is inserted into the expansion sleeve, using a hammer and other tools to gradually extend into the expansion sleeve bolt. During the process, the bolt contacts with the concave point, so that the expansion sleeve wall of the concave point and its periphery is expanded outward and clamped into the wall, so that the expansion sleeve can not move relative to the wall, so the expansion bolt is fixed. Because the side tube wall concave point is inserted into the wall, the equivalent in a plurality of directions of expansion sleeve made of fixed fixed, therefore more stable.
【技术实现步骤摘要】
一种膨胀螺栓
本技术属于紧固件
,特别涉及到一种膨胀螺栓。
技术介绍
膨胀螺栓一般说的是金属膨胀螺栓,它的固定原理如下:膨胀螺栓利用楔形斜度来促使膨胀产生摩擦握裹力,达到固定效果。螺栓一头是螺纹,一头有锥度。外面包一铁皮圆筒,铁皮圆筒的一端有若干切口,把它们一起塞进墙上打好的洞里,然后锁螺母,螺母把螺栓往外拉,将锥度拉入铁皮圆筒,铁皮圆筒的切口处被涨开,于是紧紧固定在墙上,一般用于防护栏、雨蓬、空调等在水泥、砖等材料上的紧固。上述膨胀螺栓存在下述缺点:膨胀螺栓只有一端被涨开,如果打好的洞较深时,就很难保持螺栓稳定,螺栓容易向洞内方向移动而导致松动,虽然不能掉落出来,但是却影响使用效果。
技术实现思路
本技术的目的是提出一种固定效果好的膨胀螺栓。本技术的膨胀螺栓包括膨胀套筒和螺栓,所述螺栓安装于膨胀套筒内,螺栓位于膨胀套筒内的一端为锥状或圆台状;关键在于所述膨胀套筒的筒壁多处由外向内弯曲而形成向内突出的凹点。在安装时,首先利用钻头在墙壁上钻出预定深度和直径的孔(该孔的直径应等于或略大于膨胀套筒的直径,该孔的深度应略大于膨胀套筒的长度),然后将膨胀套筒放入该孔内,然后将螺栓插入到膨胀套筒内,利用锤子等工具使螺栓逐渐伸入到膨胀套筒内。在螺栓逐渐伸入到膨胀套筒内的过程中,螺栓与凹点接触,使凹点及其周边的膨胀套筒筒壁向外扩张卡入墙壁,使膨胀套筒无法再相对墙壁移动,实现了对膨胀螺栓的固定。由于凹点的旁侧筒壁是卡入到墙壁中的,相当于在多个方向上均对膨胀套筒做了固定,无论所预先钻的孔深度是否过深,都不会导致膨胀套筒在墙体内移动,因此固定更加稳定。为保证对墙壁的附着力均匀 ...
【技术保护点】
一种膨胀螺栓,包括膨胀套筒和螺栓,所述螺栓安装于膨胀套筒内,螺栓位于膨胀套筒内的一端为锥状或圆台状;其特征在于所述膨胀套筒的筒壁多处由外向内弯曲而形成向内突出的凹点。
【技术特征摘要】
1.一种膨胀螺栓,包括膨胀套筒和螺栓,所述螺栓安装于膨胀套筒内,螺栓位于膨胀套筒内的一端为锥状或圆台状;其特征在于所述膨胀套筒的筒壁多处由外向内弯曲而形成向内突出的凹点。2.根据权利要求1所述的膨胀螺栓,其特征在于所述凹...
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