David A Brookfield

US Patent:

6539779, Apr 1, 2003

Filed:

Oct 31, 1997

Appl. No.:

08/962556

Inventors:

David A. Brookfield - Sharon MA

Assignee:

Brookfield Engineering Laboratories, Inc. - Stoughton MA

International Classification:

G01N 1114

US Classification:

73 5435, 73 5428

Abstract:

The invention comprises measuring or responsive instruments, including (but not limited to) viscometers, having a music wire ( ) or like high tensile wire support between driving/driven shaft assemblies ( ) and appropriate mounting to eliminate drag, friction, radial misalignment, vibration problems, especially at high rotational speeds, and afford an enhanced accuracy and speed of measurement or other response of the instrument as a whole, including such specific features allowing large angular deflections or small ones (full scale under one degree) and axial and radial rigidity. The instrument can also be used with a plate for cone plate, oscillation and normal force measurements.

US Patent:

20120260723, Oct 18, 2012

Filed:

Apr 13, 2012

Appl. No.:

13/446077

Inventors:

David A. Brookfield - Sharon MA, US

Assignee:

BROOKFIELD ENGINEERING LABORATORIES, INC. - Middleboro MA

International Classification:

G01N 11/00
G01B 5/24

US Classification:

73 5401, 33 1 N

Abstract:

An improved rheometer and rotatable sensing shaft sub-assembly therefor with flexural pivot support at two ends of the shaft, and means for allowing limited axial movement of the shaft while maintaining rigid radial support, with transducer means for extracting and signaling rotational position of the shaft based on shear stress of a fluent material contacting a spindle, cone/plate or other extension of the shaft and/or a related motor-driven member such as a cylinder.

US Patent:

20130340507, Dec 26, 2013

Filed:

Jun 20, 2012

Appl. No.:

13/527769

Inventors:

David A. Brookfield - Sharon MA, US
Steven Cicchese - Bridgewater MA, US
Joseph F. Murray - Bridgewater MA, US

Assignee:

BROOKFIELD ENGINEERING LABORATORIES INC. - Middleboro MA

International Classification:

G01N 11/16

US Classification:

73 5425, 73 5424

Abstract:

A viscosity measuring instrument for measuring ceramic slurries, e.g. in a casting tank, with a probe having an elbow and presenting a transducer part in substantial alignment with a flow direction of the ceramic slurry relative to the active part and a barrier orthogonal to such relative movement direction is interposed in front of the transducer part by one or more stand-off rods to form a partial enclosure that moderates flow to the active part and provides a long term stable measuring capability.

US Patent:

44480610, May 15, 1984

Filed:

Jun 7, 1982

Appl. No.:

6/385576

Inventors:

David A. Brookfield - Sharon MA

International Classification:

G01N 1114

US Classification:

73 59

Abstract:

A viscometer has an element to be immersed in a liquid the viscosity of which is to be monitored. The element is continuously rotated through a resiliently yieldable connection with the stator of a transducer rotated in a constant, selected rate. The rotor of the transducer turns relative to the stator as the connection yields or recovers as determined by the viscosity of the liquid which can vary continuously providing a continuously variable signal by which a digital readout is continuously operated.

US Patent:

55311024, Jul 2, 1996

Filed:

Dec 14, 1994

Appl. No.:

8/355702

Inventors:

David A. Brookfield - Sharon MA
Robert P. Bishop - Pembroke MA

Assignee:

Brookfield Engineering Laboratories, Inc. - Stoughton MA

International Classification:

G01N 1114

US Classification:

73 5432

Abstract:

A viscometer (10) has a spindle (12) mounted on a rotatable shaft (14) which is, in turn, contained in a tubular rotatable shaft (16) which is within a fixed hollow shaft (18). The latter is suspended from a flange (20) that mates with a flange (22) of an access port (24) of a reactor vessel (RV). There is a base for an external tower (21) that carries a motor (M) and gearing (G) to drive the rotatable shafts (14, 16). A torque interconnection between the rotatable shafts allows angular deflection between them and a transducer (28) picks up such deflection.

US Patent:

55356192, Jul 16, 1996

Filed:

Nov 17, 1994

Appl. No.:

8/341498

Inventors:

David A. Brookfield - Sharon MA

Assignee:

Brookfield Engineering Laboratories, Inc. - Stoughton MA

International Classification:

G01N 11140

US Classification:

73 5433

Abstract:

Pressurized viscometer (10) with fluid holder (12) rotatable by a motor (M) and gearing (50) to shear a tested fluid F thus imparting torque to a spindle assembly 32 mounted via a flexural mount (rods TR) and having a read-out rod or wire (40) with an adjacent transducer (R, S), the wire passing through an elongated holder shaft (18) within a fixed cylinder that mounts an elongated fluid holder extension (16) via an elongated bearing array (20, 24) on the outer surface thereof.

US Patent:

51671433, Dec 1, 1992

Filed:

Aug 28, 1990

Appl. No.:

7/574697

Inventors:

David A. Brookfield - Sharon MA

Assignee:

Brookfield Engineering Laboratories, Inc. - Stoughton MA

International Classification:

G01N 1114

US Classification:

73 5423

Abstract:

Rheometric instrument with a motor (24)-driven chamber (12) and concentric spindle (14) removable for fluid changes and reinsertable between the motor drive and a transducer (30) and sense shaft 26) utilizing a flexual mount (36) and jewel--pin mount (26A) to afford repeatably precise radial and axial positioning and, as re-assembled affording a broad range of low torque to high torque response with high sensitivity and reliability and ease of fluid containment for cleaning and handling purposes.

US Patent:

55030033, Apr 2, 1996

Filed:

Dec 14, 1994

Appl. No.:

8/355634

Inventors:

David A. Brookfield - Sharon MA

Assignee:

Brookfield Engineering Laboratories, Inc. - Stoughton MA

International Classification:

G01N 1114

US Classification:

73 5432

Abstract:

Viscometer with a spindle (4) mounted on a shaft (8) supported via axially spaced, e. g. three inches, bearings (12,14) and driving a transducer rotary member via a stiff rotationally resilient member, the latter providing substantially all the resistive torque to viscous drag imparted to the spindle by an outer driven rotating member (6) when the spindle and rotating member are immersed in a liquid whose viscosity is to be measured, the viscometer being constructed with a handle (38) that encloses motor drive and electronic components of the viscometer, these features, as a whole, providing explosion protection and portability of the viscometer with sensitivity appropriate to portable usage.