US1392073A

US1392073A - End bell

Info

Publication number: US1392073A
Application number: US88789A
Authority: US
Inventors: Mattman Emil
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1916-04-04
Filing date: 1916-04-04
Publication date: 1921-09-27
Anticipated expiration: 1938-09-27

Description

E. MATTMAN.

END BELL.

APPLICATION F ILED APR. 4, I916.

I Pawnase t. 27, 1921.

l NVENTOR [mil Ma 772mm WITNESSES fiwzdgima.

ATTORNEY UNITED STATES,

PATENT OFFICE.

EMIL MATTMAN, OF WILKINSIBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OFJ PENNSYLVANIA.

END BELL.

Specification of Iietters Patent. Patented Sept. 1921- Application filed April 4, 1916. Serial No. 88,789.

To all whom it may concern:

Be it known that I, EMIL MATTMAN, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in End Bells, of which the following is a specification.

My invention relates to end inclosing members or end-bells for dynamo-electric machines, and it has for its object to provide an improved type of end-bell which may be cheaply and easily constructed.

In the design and construction of dynamoclectric machines and especially of turbogenerators of large capacity that are operated with a forced system of ventilation, it has been found desirable to provide endbells that completely inclose the end portions of the machines. Such end-bells have heretofore been formed of cast-iron and, in order to provide the required strength, have been relatively heavy and expensive in construction. Cast end-bells possess the further disadvantage of being liable to crack when subjected to sharp blows which are of comparatively frequent occurrence in the handling of heavy parts.

By my inventlon, I propose to provide an end-bell that is build up of similar sheetmetal segments each of which may be readily formed from a suitable punched blank. An end-bell so constructed, is extremely light in weight and is adapted to withstand sharp blows by reason of the somewhat resilient nature of the sheet metal.

In the accompanying drawings, Figure 1 is a view, in front elevation, of a portion of an end-bell constructed in accordance with my invention; Fig. 2 is a view, partially in section and partially in side elevation, of a portion of a dynamo-electric machine provided with an end-bell constructed in accordance with my invention, and Fig. 3 is a plan view of a sheet-metal blankfrom which a segment of the end-bell is formed.

A dynamo-electric machine comprises a stationary armature core member 1 provided with a plurality of windings 2 and a fieldmagnet member 3 carried by a shaft 4 which is rotatably mounted in bearings 5. An endinclosing member or end-bell 6 is secured to the outer portion of the stationary core member 1 and is adapted to inclose the end portions of the winding 2 and to closely encircle the shaft 4: at a point intermediate the field-magnet member 3 and the bearing 5 The end-bell 6 comprises a plurality of slmilar segmental members 7 each of which is formed from a sheet-metal blank, preferably punched as shown in Fig. 3. The blanks are placed in a suitable press or bendng machine and are given the form shown 1n Fig. 2. Each completed segment 7 comprises substantially concentric parallel rim portions 8 and 9 and an intermediate flaredout portion 10. It is to be understood that the flared-out portion 10 may be given the form best suited for the particular arrangement of the projecting coil portions of the machine to which the end-bell is to be applied.

In constructing an end-bell, a proper number of segments 7 are assembled to form a complete annular structure. Tie-rings 11 and 12 are then secured to the substantially continuous rim portions 8 and 9, respectively, by spot-welding or other suitable means, such, for example, as bolts or rivets. Adjacent segments 7 are further secured together by spot-weldin radial ribs 13 to the abutting edges of t e segments, the ribs 13 extending between the outer peripheries of the rings 11 and 12. Holes 14 are drilled through the rings 11 and 12 and the segments 7 to receive screws 15 for securing the completed end-bell to the core member 1.

While I have shown my invention in a simple and preferred form and as applied to a particular type of machine, it is not so limited but is capable of general application, and it is desired that only such limitations shall be placed thereupon as may come within the scope of the appended claims.

I claim as my invention:

1. An annular end-inclosing structure for dynamo-electric machines comprising a pluralit of similar segmental members, rings of difierent diameters secured to the peripheral portions of said members and radial of said members.

An annular end-inclosing structure for dynamoelectric machines comprising a p1urality of similar segmental members, respectively having concentric parallel rim por- 5 tions and a flared-out portion intermediate said rim portions, radial ribs conforming to said flared-out portions and secured to the abutting edges of said structure, and rings of different diameters secured to Said rim portions.

In testimony whereof I have hereunto subscribed my name this 28th day of March.

EMIL MATTMAN