US1229215A - Scale construction. - Google Patents

Description

J. H. A. BOUSHELD.

SCALE CONSTRUCTION.

APPLICATION FILED MAR. 15, 1916.

1 ,229,2 1 5 Patented June 12, 1917.

2 SHEETS-SHEET I.

Elmo/MM J. H. A. BOU SFIELD.

SCALE CONSTRUCTION.

APPLICATION FILED MAR.15.I916.

1,229,215. Patented June 12, 1917.

2 SHEETS-SHEET 2- lllII 7/////// amoeutoz tutor/mug UNITED STATES PATENT OFFICE.

JOHN H. A. BOUSFIELD, OF ST. JOHNSBURY, VERMONT, ASSIGNOR TO E. AND T. FAIR- BANKS AND COMPANY, OF'ST. J OHNSBURY, VERMONT, A CORPORATION OF VER- MONT.

SCALE CONSTRUCTION.

Application filed March 15, 1916.

To all whom it may concern:

Be it known that I, JoHN H. A. Boos- FIELD, a citizen of the United States of America, residing at St. Johnsbury, in the county of Caledonia and State of'Vermont, have invented certainnew and useful Improvements in Scale Construction, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to lever construction for scales, such as track scales and refers more particularly to a lever construction of the type having knife edge pivots.

The main object of the invention is to provide improved means for forming the seats for the knife edge pivots and for clamping the pivots in position. heretofore been customary in the formation of the mainlever for railroad'track, or other heavy scales to either cast the, pivots in position or to core out recesses and fit in the pivots by forging. Such a construction,

however, lacks; the accuracy or refinement that is desirable in the present construction of track scales, and I have therefore provided means for accurately machining surfaces on both the pivots and the seats and for wedging the pivots into position so as to clamp the accurately machined surfaces into contact with each other.

In the drawings:

Figure 1 is a side elevational view of a track scale lever embodying my invention. Fig. 2 is a-top plan view thereof.

Fig. 3 is a cross-section on the line w-m of Fig. 1.

Fig. 4 is an end elevational view of one of the pivots...

Fig. 5 is a cross-sectional view through the pivot seat.

In the particular construction illustrated in the drawings the invention is shown as applied to the main lever of a track scale. A designates the main lever which is provided with the depending knife edge pivots B and C, and the upwardly extending knife edge pivot .D.

The invention primarily relates to the novel manner of forming the seats for these pivots and for holding the latter accurately positioned within their seats. As shown in detail-in Fig. 5, the knife edge pivot (such as B) is provided with a machined surface E which abuts against the accurately ma- Speification of Letters Patent.

It has- Patented June 12, 1917.

Serial No. 84,447.

chined side wall F of the seat G. This seat of the recessed portion has a vertical face F against which the machined face E of the pivot is forced. For holding the two machined surfaces in contact, I employ a clamping strip J which has an inclined surface K adapted to wedge against the oppositely inclined surface L of the pivot. This clamping strip is held in position by a cap screw M which has a threaded engagement with the body of the lever so that upon adjusting the cap screw the clamping strip can be forced against the inclined side wall of the pivot and willv thus produce a sufficientwedging action to force the two machined surfaces E and F tightly against each other.

It will be noticed that clamping strip K does not engage with the bottom of the recess or seat G but is free to wedge tightly against the inclined side of the pivot. As a precaution against end-wise movement of the pivots, dowel pins O are employed, but the accurate alinement of the pivots is obtained solely by forcing the machined surfaces together. From the above description it will be obvious that the alinement of the pivots can be maintained with great accuracy in both planes and that this advantage is obtained by a comparatively simple and economical construction.

While I have shown and described in detail the pivot B, it is obvious that the pivots C and D are similarly formed, except in the particular construction shown in Fig. 2 only two of the cap screws M are employed for pivot C, which is of lesser length than are .the pivot members B and D. The invention,

however, is not limited to any particular number or arrangement of pivots or in an manner except as specified in the appended claims.

What I claim as my invention is 1. The combination with a scale lever, of a plurality of knife-edge pivots therefor, said lever having a plurality of accuratelymachined vertical walls spaced an exact distance apart and said pivots each having an accurately-machined vertical wall adapted to engage the machined wall of the lever, and mechanism for securing the pivots in position so that their distance apart is determined entirely by the machined walls.

, 2. The combination with-a scale lever, of

a knife-edge pivot therefor, said lever having an accurately-machined vertical wall and sald pivot having an accurately machined vertical surface adapted to engage the machined wall of the lever, and means for clamping the machined surface of the pivot into contact with the machined wall of the lever.

3. The combination with a scale lever, of a knife-edge pivot therefor, said lever having a recess adapted to receive the body portion of the pivot, one wall of the recess being provided with an accurate surface and the adjacent surface of the pivot also being formed accurately, and. a wedge member adapted to force said accurately-formed surfaces into contact with each other.

4E.'The combination with a scale lever, of a knife-edge pivot therefor, comprising a base portion and a side formed accurately at right angles thereto, the opposite side of said pivot being inclined toward the base, and a Wedge member adapted to act upon the inclined surface of the pivot to force the accurately-formed surface of the pivot into contact with an accurately-formed surface on the lever.

5. The combination with a scale lever, of a knife-edge pivot therefor, said lever having a true vertical surface and said pivot member having a true vertical surface and an inclined surface, a wedge member bearing against the inclined surface, and means for adjusting the wedge member to bear against the inclined surface of the pivot member and force the vertical surface thereof into contact with the vertical surface on the lever.

6. The combination with a scale lever having a plurality of spaced knife-edge pivots and seats for said pivots having accurately formed walls spaced a predetermined distance apart, and means for positioning the pivots by clamping the same against said accurately formed walls.

In testimony whereof I afiiX my signature.

JOHN H. A. BOUSFIELD.

Witnesses:

OSMAR A. ULLRIOH, GEO. R. BALLINGER.

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