US523022A - Level - Google Patents

Description

(No Model.)

J. A. TRAUT.

LEVEL.

Patented Ju1y'17, 1894.

Inventor: Justus Jllfi'aut. 13y ZZI'SJHW 2 Witu esses UNITED STATES PATE T OFFICE.

JUSTUS A. TRAUT, OF NEW BRITAIN, CONNECTICUT.

LEVEL.

SPECIFICATION forming part of Letters Patent No. 523,022, dated July 17, 1894.

Application filed February 3, 1894. Serial No. 498,990. (No model.)

T0 at whom it may concern:

Be it known that I, J USTUS A. TRAUT, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Levels, of which the following is a specification.

This invention relates to that class of levels known as spirit-levels.

The object of this invention is to provide, in connection with a level-stock and levelglass, a simple and efficient device for facilitating the true sighting of the bubble in the level-glass, either when viewed from above in the usual manner, or when viewed through the side openings in the stock; and to so construct the sight-device that in sighting any deviation from a center line bisecting the bubble at rightjangles to its length will be instantly noticed, and may be quickly remedied, thus insuring accuracy in sighting.

In the drawings accompanying and forming a part of this specification, Figure 1 is a plan view of alevel embodying my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical cross-section taken in dotted lineaa, Fig. 2. Fig. 4 is a side view of a portion of the level as seen from a point in alignment with the dotted division line bb shown in Fig. 1.

Similar characters designate like parts in all the figures.

The level comprises the usual level-stock B, recessed longitudinally at its upper side midway of its length to receive a level-glass, E, which may be secured therein in any usual manner, said level-stock having the usual side-openings, 3 and 4., through which the level-glass may be viewed from either side of the stock.

Secured to the upper face of the level-stock, preferably by means of screws, is a guardplate, D, which is centrally and longitudinally slotted orrecessed, as shown at 2, to form the sight-opening through which the bubble, e, in the level-glass may be viewed from above. This plate (which will be hereinafter termed the sight-plate) has two oppositely-disposed inwardly and downwardly proj ecting points, 5 and 6, preferably V-shaped, and terminating in close proximity to the level-glass, and extending inwardly beyond the outer edges of the bubble e when this is in its middle position in the glass. These sight-points 5 and 6 are shown formed at opposite sides of the sightopening 2, as shown most clearly in Figs. 1 and 3 of the drawings, and project inwardly and downwardly sufficiently so that they may be readily seen either from above or below the plate D, thereby enabling the user to observe, by comparison of said points, whether the bubble is accurately located, with said points centrally 0f the length thereof, irrespective of the point of observation.

When looking at the bubble from the side of the level, the points not only serve, in the manner before described, forlocating the bubble, but also, in consequence of their relation one to the other, for accurately showing the correctness of the point of vision with relation to a straight line drawn through the center of the bubble at right angles to its length, thereby avoiding error in the reading of the same. For instance, when reading the level, if the point of vision of the user is at one side of a line drawn through the centers of the two points 5 and 6 (as when the sight is taken in alignment with the dotted line bb, Fig. 1) both of said points will be Visible, as illustrated in Fig. 4, and the user will be cognizant of the fact that his line of vision is not correct; by moving his position so that the nearest point 6 entirely hides the point 5, said error in observation is corrected, and he is enabled to obtain a correct observation of the exact location of the bubble.

The sightplate will preferably be constructed of sheet metal, stamped to the form illustrated in Fig. 1, with a central opening 2 therein and withinwardly projecting points with their apexes in alignment transversely of the plate; which points will be subsequently bent downward, as shown in Fig. 3.

Having thus described my invention, I claim- 1. In a level, the combination with the levelstock and with the level-glass secured therein, of two oppositely-disposed inwardly projecting fixed points terminating remote from each other adjacent to the level-glass and in exact alignment at right angles to the longitudinal axis of the level-glass, substantially as described and for the purpose set forth.

2. In a level, the combination with the lonthe purpose set forth.

gitudinal and transversely recessed levelstock, and with "the level-glass secured therein, of two oppositely-disposed inwardly-projecting fixed points terminating adjacent to the level-glass at points below the upper surface of the level-stock and in exact alignment at right angles to the longitudinal axis of the level-glass, substantially as described and for 3. In a level, the combination with the levelstock and the level-glass secured therein, of a longitudinally slotted plate secured to the level-stock and having oppositely-disposed inwardly-proj ectin g fixed points terminating remote from each other, in a line at right angles to the longitudinal axis of the level-glass and extending below the lower face of said plate 3 in close proximity to the level glass, substantially as described and for the purpose set forth.

4:. The herein-described sight-device for levels, it consisting of a plate havinga lon'gi- 1 tudinal sight-opening and having integral opposi'tely-disposed inwardly and downwardlyprojecting points or barbs terminating remote from each other, in a line at 'right'angles to the longitudinal axis of said sight-opening, substantially as described and for the purpos set forth.

5. The herein-described-level, it comprising a stock B recessed vertically and longitudinally to receive the level-glass and having the side-openings 3 and 4, and a. longitudinally- J USTUS A. TRAUT.

Witnesses;

FRANCIS I-I. RICHARDS, FRED. J. DOLE.

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