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公开(公告)号：US5771635A
公开(公告)日：1998-06-30
申请号：US646364
申请日：1996-08-16
申请人： Keith Thomas Skinner
发明人： Keith Thomas Skinner
CPC分类号： F15B15/065 , E05F15/53 , E05F3/02 , E05F3/224 , F15B11/076 , E05Y2201/21 , E05Y2201/256 , E05Y2201/264 , E05Y2201/41 , E05Y2201/422 , E05Y2201/448 , E05Y2400/44 , E05Y2400/454 , E05Y2800/112 , E05Y2800/113 , E05Y2900/132 , F15B2211/212 , F15B2211/30525 , F15B2211/40584 , F15B2211/455 , F15B2211/46 , F15B2211/625 , F15B2211/7716 , F15B2211/8855
摘要： A pneumatic device 10 comprises a piston 12 moveable along a cylinder 10. The piston has opposite ends 18, 26 defining a space 30 therebetween. The space is divided into two chambers 30a, 30b by a housing 40 fixed relative to the cylinder and having a fluid flow control passageway 42 therethrough. The space 30 is filled with fluid, such as oil. The piston 12 is arranged such that movement thereof against a spring 16 causes the fluid to be displaced from one chamber 30a of the space 30 to the other chamber 30b through the passageway 42. The spring 16 is arranged to apply a return force to the piston 12 and the rate of return of the piston 12 is controlled by the return flow of fluid through the passageway 42. A pneumatic system 100 includes a device 10 connected between first and second members 58, 58a of a building, such as a door and door frame. The pneumatic system comprises a source of compressed gas C for operating the device 10 to enable the device 10 to move the first member 58 relative to the second member 58a, ie to open and close the door. A switching device 72 controls the supply of compressed gas to the device 10.
摘要翻译： PCT No.PCT / GB95 / 02208 Sec。 371日期：1996年8月16日 102（e）日期1996年8月16日PCT提交1995年9月18日PCT公布。 公开号WO96 / 08657 日期1996年3月21日气动装置10包括可沿气缸10移动的活塞12.活塞具有在其间限定空间30的相对端18,26。 该空间被相对于气缸固定的壳体40分成两个室30a，30b，并具有通过其的流体流动控制通道42。 空间30填充有诸如油的流体。 活塞12被布置成使得其相对于弹簧16的运动使得流体通过通道42从空间30的一个室30a移动到另一个室30b。弹簧16被布置成将返回力施加到活塞 活塞12的返回速率由通过通道42的流体的返回流控制。气动系统100包括连接在建筑物的第一和第二构件58,58a之间的装置10，例如门和门 帧。 气动系统包括用于操作装置10的压缩气体源C，以使得装置10能够使第一构件58相对于第二构件58a移动，即打开和关闭门。 开关装置72控制向装置10供给压缩气体。
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公开(公告)号：US3952384A
公开(公告)日：1976-04-27
申请号：US512501
申请日：1974-10-07
CPC分类号： F16L1/06 , B25B5/147 , Y10T279/1241 , Y10T279/18
摘要： The invention provides a pipe jack for pulling a pipe lengthwise through the ground without the necessity of excavating the ground to create a trench first, the jack including a number of hydraulic rams coupled to a set of jaws, and the jaws being hydraulically displaceable to clamp a pipe disposed between them.BACKGROUND OF THE INVENTIONThis invention relates to pipe jacks, which are known devices for use in hauling pipes, cables and the like through the ground. By disconnecting a length of pipe or like at both ends, and then pulling the pipe lengthwise, the expense and labour of creating a trench, that is removing earth from above the pipe, can be avoided. In cases where the pipe runs below a surfaced road, pavement or the like, additional substantial costs in resurfacing are avoided. A new pipe may be installed in similar manner for example by attaching the same to the trailing end of the old pipe being removed, or by threading the new pipe into the orifice created by withdrawing the old pipe.The known devices have comprised a screw operated vice for gripping the pipe, and attached to a hydraulic ram which is contracted to haul the vice and hence the pipe towards the stationary end of the ram.SUMMARY OF THE INVENTIONThe objects of the present invention are to provide an improved pipe jack.In accordance with the present invention, a pipe jack comprises a number of fluid powered rams which extend between a fixed head and a movable head, the latter being provided with a plurality of jaws, each of said jaws being hydraulically displaceable to clamp a pipe or like disposed between the jaws.Preferably the jaws are levers of the first order, being pivoted to the head, having a serrated or like gripping surface at a free end, and lying against hydraulically activated pistons housed in the head at their other ends: three equi-angularly spaced jaws being preferred.The jaws may be spring returned from the hydraulically closed position by hairpin springs interposed between the head and the jaws, or for example by extensions of the lever ends coupled to tension springs.Preferably also the movable head comprises a centreing device comprising a series of radially movable plungers which may be equi-spaced about the head and alternated with the jaws, and the plungers are associated with means for displacing all of them to similar radial positions together, so that pipes or like of different diameters can be accommodated in a single apparatus and to ensure that the jaws grip the pipe at equi-spaced positions, as a result of the centreing action of the plungers. The plunger displacing means are preferably manually operated.Alternatively a more single centreing device may be provided comprising equi-spaced radially directed screws.
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公开(公告)号：US5807038A
公开(公告)日：1998-09-15
申请号：US743402
申请日：1996-11-01
申请人： Keith Thomas Skinner
发明人： Keith Thomas Skinner
CPC分类号： B23B31/02 , B23B31/11 , B23B51/0473 , Y10T279/16 , Y10T279/17948 , Y10T279/17965 , Y10T408/895 , Y10T408/907 , Y10T408/95
摘要： A drill chuck for holding a tapered end of a tubular drill bit. The chuck comprises a driving member having a tapered surface for frictional engagement with the tapered end of the drill bit, a first holding member mounted on the driving member and a second holding member mounted, in use, on the tubular drill bit. The second member has a substantially radial surface thereon for abutment with a surface 31 on the drill bit. The two holding members can be screwed together whereby abutment between the substantially radial surface on the second holding member and the surface on the drill bit urges the tapered end of the tubular drill bit into frictional driving contact with the tapered surface of the driving member.
摘要翻译： 用于保持管状钻头的锥形端的钻夹头。 卡盘包括具有用于与钻头的锥形端摩擦接合的锥形表面的驱动构件，安装在驱动构件上的第一保持构件和在使用中安装在管状钻头上的第二保持构件。 第二构件在其上具有基本上径向的表面，用于与钻头上的表面31邻接。 两个保持构件可以被拧紧在一起，由此第二保持构件上的基本上径向的表面与钻头表面之间的邻接促使管状钻头的锥形端部与驱动构件的锥形表面摩擦驱动接触。
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