MARTIN GORDON YAPP
Pilots at Robinwood Ave, Needham, MA

5611668, Mar 18, 1997

Jun 16, 1995

8/491248

Martin G. Yapp - Needham MA
Richard L. Matsu - Plymouth MI

Bosch Automotive Motor Systems, Inc. - Waltham MA

F04D 2932

416189

A plastic fan includes two injection molded parts, each of which includes its own hub and a set blades extending outwardly from the hub to a band. The two parts are co-operatively sized and shaped to be assembled into a single operable fan having: 1) a hub comprising the hubs of each of the component parts; 2) the blades of the component parts; and 3) a circumferential band comprising the bands of the component parts. The fan blade separation on each of the fan parts is relatively large, permitting separate injection molding of each part. The resulting fan may be designed to have far greater blade number and blade solidity that would be possible for a fan that is injection molded by standard techniques. The fan may be packaged in an airhandler assembly that includes a flexible cylindrical retraining member generally coaxial with, and external to, a rigid cylindrical member, the fan band and the stator assembly, so as to support the stator assembly and to maintain the parts in place. A conical airguide may be positioned axially between the fan assembly and the stators.

5297931, Mar 29, 1994

Apr 28, 1993

8/052811

Martin G. Yapp - Needham MA
Robert Van Houten - Winchester MA
Robert I. Hickey - Concord NH

Airflow Research and Manufacturing Corporation - Watertown MA

E01D 102

4152081

An improvement to forwardly skewed axial fans whereby blade camber and rake are coordinated with skew. The blades are characterized in that a line defined by the points of maximum chordwise camber (f. sub. max) as a function of changing radial position (r) is on the leading edge side of the mid-chord line (M. sub. CL) at values of r toward the root of the blade, and is less forwardly skewed than the leading edge (LE), the mid-chord line (M. sub. CL), and the trailing edge (TE) of said blade; the blade is raked forwardly so that the trailing edge of the blade tip is axially forward of the trailing edge at the blade root; rake (k) increases monotonically as radial position r increases from 0. 75R to 1. 0R, R being the fan radius; the blade has a relatively large pitch ratio (P/D); and rake is corrected to reflect the chordwise position of maximum camber. As a result, the fan produces a flow that is generally in radial equilibrium having a reduced component of flow normal to the2 desired axial flow and normal to the tangential flow.

5489186, Feb 6, 1996

Feb 15, 1995

8/388749

Martin G. Yapp - Needham MA
Robert V. Houten - Winchester MA
Robert I. Hickey - Concord NH

Airflow Research and Manufacturing Corp. - Waltham MA

F04D 2966

415 587

Stationary flow control vanes positioned to encounter and redirect recirculating airflow provide a surprising combination of efficiency, low noise, and manufacturability for shrouded, banded, axial fans that are positioned in a housing. Such fan and housing combinations reduce swirl in recirculating airflow, so that the airflow entering the fan (which includes the recirculating airflow) is more ordered and fan performance is improved. The invention is particularly suited for fans that draw airflow through an upstream heat exchanger. It can also be applied to fans that blow air through a downstream heat exchanger. The invention is also suited for ducted fans.

7585159, Sep 8, 2009

Apr 27, 2004

10/832686

Mark D. Caplan - Westborough MA, US
Wolfgang Kehrer - Newton MA, US
Martin G. Yapp - Needham MA, US

Robert Bosch GmbH - Stuttgart

F04B 39/06, B63H 1/16, A47C 7/74

417368, 416179, 416169 A

The present invention provides an automotive engine-cooling fan assembly including a motor having a driveshaft defining a central axis, and a fan driven by the motor. The fan includes an inner hub portion coupled to the driveshaft, and an outer hub portion coupled to the inner hub portion. The outer hub portion is coupled to a plurality of radially-extending blades. The fan also includes a plurality of vibration isolation members interconnecting the inner hub portion and the outer hub portion.

4946348, Aug 7, 1990

Nov 17, 1989

7/437324

Martin G. Yapp - Needham MA

Airflow Research & Manufacturing Corporation - Watertown MA

F04D 2944

4152112

A rearwardly curved centrifugal blower having an annular envelope around the impeller, so that the rotating impeller draws air in through a central inlet and forces it radially outward into the envelope and out of an annular discharge. Multiple airfoil vanes are positioned in the annular envelope, in two axially displaced stages. The vanes are angled to turn and diffuse airflow entering the envelope.

4900228, Feb 13, 1990

Feb 14, 1989

7/310664

Martin G. Yapp - Needham MA

Airflow Research and Manufacturing Corporation - Watertown MA

F04D 2920

416183

Boundary layer separation in a rearwardly skewed centrifugal impeller can be better controlled by designing the impeller blades with an "S" camber, i. e. , with rearward curved radially extending blades in a centrifugal blower. The blades have a positive camber at a radially inward region and a negative camber at a radially outward region of the blade.

5743710, Apr 28, 1998

Feb 29, 1996

8/609062

Martin G. Yapp - Needham MA

Bosch Automotive Motor Systems Corporation - Waltham MA

F04D 2944

4152082

Centrifugal blower with improved envelope geometry, and improved impeller top and hub plate design.