Design of a Quiet Rock Drill. A Feasibility Study Using Principles of Leavell Pavement Breaker.
Authors
Anderson-FR; Shaikh-N
Source
NTIS: PB/274-402 Available for Reference At Bureau Libraries :41 pages
Link
NIOSHTIC No.
10000171
Abstract
This report shows the feasibility of a quiet stopper for drilling roof bolts in coal mines. The work is directly applicable to pneumatic percussive rock drills. The report shows an oscillator based on patented leavell concepts which results in a vibration-free tool and noiseless exhaust. The dynamics of the oscillator are analyzed. Independant rotation of drill rod is provided by an air motor (screw expander), and flushing of cuttings is accomplished by an air ejector in a compact lower housing. The feasibility of no exhaust noise, low drill machine noise, and vibration-free casing is discussed.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-274402
NTIS Price
A04
Identifying No.
OFR 162-77
NIOSH Division
PRC;
Source Name
NTIS: PB/274-402 Available for Reference At Bureau Libraries
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link.
CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website.
For more information on CDC's web notification policies, see Website Disclaimers.
CDC.gov Privacy Settings
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.
Thank you for taking the time to confirm your preferences. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page.