HERBERT N HOFFMAN
Engineering in Lunenburg, MA
License number
Massachusetts 4888
Expiration Date
Jun 30, 1986
Type
Mechanical Engineer
Address
Address
Lunenburg, MA 01462
Personal information
See more information about HERBERT N HOFFMAN at radaris.comName
Address
Phone
464 Commonwealth Ave APT 56, Boston, MA 02215
85 Appleton St APT 2, Malden, MA 02148
85 Appleton St, Malden, MA 02148
14 Waushacum Ave, Sterling, MA 01564
55 Appleton St, Malden, MA 02148
Professional information
Vibration Detection Probe Holder
US Patent:
4018083, Apr 19, 1977
Filed:
Aug 22, 1975
Appl. No.:
5/606838
Inventors:
Herbert N. Hoffman - Lunenburg MA
Assignee:
General Electric Company - Schenectady NY
International Classification:
G01H 1100
US Classification:
73 70
Abstract:
A vibration detection probe holder for use in measuring the vibration of a shaft employed in rotating machinery such as turbines or generators comprises a stationary probe housing fixed to a bearing bracket or other suitable stationary member. Upon initial assembly, the housing is accurately positioned in close proximity to the shaft. This probe housing is provided with stop means which determine the exact location of a vibration detection probe when such a probe is inserted in the housing, thereby obviating any risk of contacting the rotating shaft with the probe should such an insertion be required while the shaft is rotating. The stop means also ensure that any replacement probe will be located the same distance from the rotating shaft as the probe initially provided in the holder thereby ensuring continuing accurate readings obtained from any such replacement probes. A flexible cable, or a series of sleeves positioned within the housing, provide a means for maintaining the probe in position within the housing. Sealing means disposed at the radially inner end of the housing prevent the splashing of lubricating oil and any contaminants entrained therein from the rotating shaft into the probe holder.
Throttle Valve Operator
US Patent:
4033234, Jul 5, 1977
Filed:
Jun 2, 1975
Appl. No.:
5/582705
Inventors:
Norman E. Nutter - Lunenburg MA
Herbert N. Hoffman - Lunenburg MA
Herbert N. Hoffman - Lunenburg MA
Assignee:
General Electric Company - Schenectady NY
International Classification:
F15B 910
US Classification:
91384
Abstract:
The disclosure relates to a valve operator which may be used for controlling an inlet valve to a steam turbine. The valve operator has a trip position for rapidly closing the steam inlet valve and a reset position whereby the position of the steam inlet valve may be hydraulically controlled. The valve operator includes a manual operator and a remote powered operator. A trip relay and a reset pilot are fluidly interconnected so that the valve operator must be reset after each trip. The valve operator also includes a valve position feedback mechanism.