公开(公告)号：US3776647A

公开(公告)日：1973-12-04

申请号：US3776647D

申请日：1972-08-31

Applicant: HART H

Inventor： HART H

IPC: B23B31/00 ,  B23Q11/00 ,  B23B47/00

CPC classification number: B23B31/001 ,  B23Q11/0053 ,  Y10T408/50 ,  Y10T408/5653 ,  Y10T408/98

Abstract: This is an attachment for a drill that provides a safety guard, and a dust and debris catcher. It is in the form of a pair of frusto-cones, preferably of stainless steel, removably held in spaced apart relationship by a cylinder of similar material, providing space for the dust and debris to accumulate therebetween. The apexes of the frusto-cones are apertured to permit the drill-bit to extend therethrough. The frusto-cones and cylinder, in turn, are threadedly secured on a telescopic sleeve which is retractable into and between a pair of concentric sleeves, secured together, and mounted on a drill body, fitting over the drill hub, and removably secured to the drill body. A spring about the frusto-cones and the cylinder urges the frustocones outwardly and permits the frusto-cones and telescopic sleeve to retract as the drill-bit penetrates the material being drilled. The outer concentric sleeve is apertured to permit ready retraction and prevent pressure building up between the concentric sleeve, and permit suction through the frusto-cone apertures as the drill is removed from the drilled area, thus providing a vacuum cleaner effect about the drill-bit to keep the dust within the frusto-cones as the drill-bit is removed. To empty the dust, telescoping the male sleeve back and forth will act like a blow-gun and blow out the dust and debris. A drill-bit depth-limiting and depth gauge for the drill, and in another form, a drill depth measuring gauge on the outer surface of the telescopic sleeve, is provided. Should the drill-bit break while in use, the broken parts will be trapped within the frustocones or concentric sleeves, preventing any injury or damage. To prevent the dust from falling out, the drill-bit aperture in the outer cone when drilling downwardly, as in a floor, an internal flared pipe is detachably added to the inside of the outer frusto-cone, just slightly larger than the drill-bit, and has a flared internal flanged lip so that the major part of the dust will collect within the outer cone.

Abstract translation: 这是一个钻头附件，提供一个安全防护装置，以及一个灰尘和碎屑捕集器。 它是一对截头圆锥体，优选不锈钢的形式，通过类似材料的圆筒以可拆卸的方式保持间隔开的关系，为灰尘和碎屑提供空间以便在它们之间积聚。 截头圆锥体的顶点是有孔的，以允许钻头穿过其延伸。 截头圆锥体和圆柱体又被螺纹固定在可伸缩的套筒上，伸缩套筒可伸缩到一对同心的套筒之间并固定在一起，并且安装在钻体上，装配在钻头毂上，并且可拆卸地固定在 钻体。 围绕截头圆锥体和圆柱体的弹簧向外推动截头圆锥体，并且允许截头圆锥体和伸缩套筒随着钻头穿透正在钻探的材料而缩回。 外部同心套筒是有孔的，以允许准备回缩并防止在同心套筒之间形成压力，并且当钻头从钻孔区域移除时允许通过截头圆锥孔的抽吸，从而提供关于钻头的真空吸尘器效应 在钻头被去除时，将灰尘保持在截头圆锥体内。

公开(公告)号：US3840773A

公开(公告)日：1974-10-08

申请号：US31996872

申请日：1972-12-29

Applicant: HART H

Inventor： HART H

IPC: H01J29/18 ,  H01J29/26 ,  H01J29/80 ,  H01J31/20 ,  H04N9/27 ,  H01J29/70

CPC classification number: B82Y10/00 ,  H01J29/187 ,  H01J29/803 ,  H01J31/208

Abstract: An improved color display system employing a beam penetration type cathode-ray tube with rapid color switching. The screen electrode is separated from the accelerating electrodes without the use of an isolating mesh so that the voltage applied to the screen electrode is switched across only a relatively small capacitance. The invention may be used in conjunction with either magnetic or electrostatic deflection beam penetration cathode-ray tubes as well as either magnetic or electrostatic focus tubes. Such display systems may be used for radar type random access or scanned raster type displays.