US595553A

US595553A - Manufacture of gear-wheels

Info

Publication number: US595553A
Authority: US
Publication date: 1897-12-14
Anticipated expiration: 1914-12-14

Description

(No M odel.) D.'S. BISSELL.

' MANUFAGTURE 0F GEAR WHEELS. No. 595,553. Patented Dec. 14, 1897.

FIELI.

2 diff/SM mwmm WITNESSES:

UNITED STATES PATENT v FFICE.

MANUFACTURE OF G EAR-WH EELS.

SPECIFICATION forming part of Letters Patent No. 595,553, dated December 14, 1897.

Application filed. February 15, 1897. Serial No. 623.399. (No model.)

To all whom it may concern: I

Be it known that I, DAVID S. BISSELL, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in the Manufacture of Gear-Wheels, of which improvements the following is a specification.

The invention described herein relates to certain improvements in the construction of gear-wheels, especially of that class or kind which are formed in two or more sections, so as to permit of their easy removal from their shafts in case of breakage.

My improved wheel is more especially adapted for use in transmitting power from anelectrio motor to street-car axles. On account of the frequency of the breakage of such wheels it is necessary, or at least highly desirable, to form them in two or more sections, so as to permit of their renewal without removing any considerable portion of the driving and transmitting mechanism.

Heretofore gear-wheels for street-car motors have been of cast-steel ormalleable iron in two'or more sections, the rim, spokes, and hubs of each section being formed'integral with each other. This material and manner of forming the wheels are objectionable on account of the blow-holes which are generally present in steel castings. pens that in cutting the teeth in a casting which is apparently sound quite large blowholes are disclosed, which render the casting worthless. It also frequently happens that the blow-holes are not disclosed in the formation of the teeth; but such cutting operation so reduces the walls surrounding the blow-holes that the wheel will break as soon as subjected to considerable strain.

The object of the present invention is to construct a sectional gear-wheel with a wro ughtsteel rim or felly and with a cast or wrought steel or iron hub and arms. The inven- It frequently hap-' the connecting-bolts being shown in section. Fig. 3 is a detail view showing the head or enlargement on the ends of the spoke-sections.

In the practice of my invention I form, by rolling or hammering, a blank similar to a channel-bar in that it has flanges united by a web or body portion, but with an added body of metal in the web or body of sufficient thickness to permit of the formation of teeth by cutting or swaging. This blank is then divided into sections of a length sufficient to form the whole or any desired portion of the rim or felly of the wheel. The length of such sections will be dependent upon the diameter of the wheel and will also depend upon the character of the wheeled. e., whether the rim or felly is to be made in sections or not. For purposes of illustration I have shown the invention as used in the construction of sectional wheels such as employed in street-car service. These blank sections are then heated and bent to the desired curvature. As the fiangesare liable to be twisted in the bending operation, it is preferred to employ a former to prevent any such distortion of the flanges. The curved blanks are then secured to a suitable support for the teeth-forming operation.

For convenience the spokes and hub of the completed wheel are preferable as supports for the rim and felly. The rim or felly being secured to the spokes, the teethare formed, preferably, by milling in the web or body portion 1 of the blank.

For street-car purposes, where it is some times necessary to remove the gear-wheels, the latter are made in sections, as shown, and the several parts of the wheel are secured together before the teeth are formed. In such a sectional wheel the spokes or arms 3 are formed integral with the hub-sections 4, as shown. On the outer ends of the arm-sections are formed curved heads 5, of a crosssectional shape and dimensions, correspond ing to the space between the flanges 2 of the rim. These heads are secured to the rim by means of bolts or rivets passing through the flanges and heads. On account of the liability of nuts becoming loose it is preferred to em ploy countersunk rivets, as shown, for the purpose of connecting the rims and spokes.

The two sections of the Wheel are connected together by transverse bolts 6, passing through the spokes, as shown.

As the blanks of the rims of my improved gear-wheels are produced by hammering or rolling down a considerable mass or body of metal, any blow-holes or porosity existing in the ingot or billet is closed up, the walls of the blow-holes being welded together, so that the resultant blank is a solid homogeneous body of metal, much tougher and less liable to breakage than even solid steel ormalleableiron castings. The body of the blank is made of sufficient thickness to permit of the formation of teeth of the desired height on the web portion a, having the flanges 2 along its inner edges. By forming the rim-blank independent of the hub and arms or spokes and detachably securing it to the spokes a renewal of the rims, which are more rapidly worn out than other parts of the wheels, can be easily and quickly effected. The parts of the wheel are so constructed and united that the two sections thereof can -be bound together by bolts closely adjacent to the rim. This is a very desirable characteristic, as in such position the bolts are better capable of resisting any strain.

I claim herein as my invention- As an improvement in the art of manufacturing gear-wheels, the method herein described, which consists in shaping a blank by rolling or forging, having abody portion with flanges along its edges, cutting the blank into sections of desired length, heating said sections and bending them to the desired curvature, securing the flanges to a centering-support as the hub and spokes and finally forming teeth in body portion forming the rim or felly, substantially as set forth.

In testimony whereof I have hereunto set my hand.

DAVID S. BISSELL.

\Vitnesses:

DARWIN S. WoLcoTr, M. S. MURPHY.