公开(公告)号：US06835881B1

公开(公告)日：2004-12-28

申请号：US10388724

申请日：2003-03-17

申请人： Donald Jackson

发明人： Donald Jackson

IPC分类号： G10D316

CPC分类号： A44B15/005 ,  G10D3/163

摘要： A guitar pick having a key ring hole for selective attachment to a key ring, and also having a centrally-located disc constructed from non-slippery material, in order to prevent the pick from slipping from a user's fingers while the pick is being used to play a guitar. The key ring hole is lined on both the front and rear surfaces of the pick with a raised bushing, in order to prevent the key ring hole from cracking or splitting after repeated use. When not being used to play a guitar, the guitar pick may be stored upon the key ring, in order to prevent the pick from becoming misplaced.

摘要翻译： 吉他拾音器具有用于选择性地附接到钥匙圈的钥匙环孔，并且还具有由防滑材料构成的居中定位的盘，以便防止拾取器从使用者的手指滑落，同时将拾取器用于 弹吉他 钥匙圈孔在带有凸起衬套的接头的前表面和后表面上排列，以防止钥匙圈孔重复使用后开裂或分裂。 当不用来弹吉他时，吉他拾音器可以存储在钥匙圈上，以防止拾音器错位。

公开(公告)号：US06537033B2

公开(公告)日：2003-03-25

申请号：US09827685

申请日：2001-04-06

申请人： Lionel H. Brazil ,  Donald Jackson

发明人： Lionel H. Brazil ,  Donald Jackson

IPC分类号： F04B4900

CPC分类号： F04B49/20 ,  A01J5/048 ,  F04B2205/05 ,  Y10S137/907

摘要： An open loop feedback control apparatus for a vacuum controlled system for providing vacuum stability within a predetermined range of vacuum levels is shown. The open loop feedback control apparatus includes a vacuum regulator having a diaphragm including a valve member having a valve opening or input port which changes position as a function of the vacuum level within the vacuum system for controllably admitting or bleeding air into the vacuum system to adjust the vacuum level within the vacuum system. A transducer is operatively coupled to the diaphragm for producing an output signal which represents an instantaneous position of any one of the diaphragm valve member, valve opening or input port. A control device having a pair of inputs and an output has applied to one of the pair of inputs a set point signal representing a programmed vacuum level for the vacuum system and has applied to the other of the pair of inputs the output signal from the transducer representing an instantaneous position of any one of the diaphragm valve member, valve opening or input port. The control device produces on its output a control signal for controlling speed of a variable speed motor which drives a vacuum pump at various speed as required to enable the vacuum pump to maintain the vacuum level of the vacuum system within a predetermined range of vacuum levels.