US816032A - Tape-stretcher. - Google Patents

Description

UNITED sTATEs PATENT oEEroE.

Speccaton of Letters Patent.

r Patented March 27,1906.

Application led December 13, 1905. Serial No. 291,52'7.

To @ZZ whom, it may concern:

Be it known that I, GEORGE OERTEL, la citizen of the United States, residing at New York city, Manhattan, county and State of NewYork, have invented new and useful Improvements in Tape-Stretchers, of which the following is a specliication.

Thisl invention relates to an apparatus for enabling surveyors to impart a uniform and predetermined tension to the measuring-tape, so that the distances measured off will be correct.

In the accompanying drawings, Figure l is a side view of my improved tape-stretcher; Fig. 2, a section on line 2 2, Fig. l; Fig. 3, a section on line 3 3, Fig. 2 Fig. 4, an enlarged section on line 4 4, Fig. 1, Fig. 5, a section on line 5 5, Fig. 4, partly in side view; and Fig.

, provide 6', a detail ofthe indicator.

The letter a indicates the open trapezoidal base of the stretcher, across which extends a bar a, arallel to the rear bar a2 of the base. An osci lating shaft b is j ournaled to the parts a a2 by coned screws b b2. The shaft b 1s engaged by a brake-strap c, which serves to hold it in position. From shaft b rises a slotted standard e, provided with a handle e.

' The standard e is embraced by a slide f, held at any suitable elevation by a clamp-screwf To slide d] is pivoted at g a disk or sector g,

with a hand-lever g2 and received within the slot of standard e. A ileXible strap h is secured at its rear end to sector g, as atv h. Above strap h is arranged a rail i, secured to such strap at its front end only, as at it', the rail being disconnected from the strap at its rear end. The arts h i pass over a front guide-rollerf2 of s ide f, thence through slot of standard e, and, finally, below arearV guide-rollerf3 of the slide.

To the front of rail t' is secured a yoke y', that embraces the casing Zc of an indicator, such casing being afliXed to the yoke y' by screws Zr. Into casing Zc projects the shank of a sliding hook Z, the beak Z of which is adapted to engage one end of a surveyors tape m. The hook Z is normally retracted by a* spring Z2 and is operatively connected to a pointer n by a rack Z3 and pinion n. The pointer n moves over a dial Zc2 of casing Ze, the position of the pointer thus indicating the tension of hook Z.

To obtain accurate results in a survey, it is,

of course necessary that the tape be subjected to the same tension for each measurement, the particular tension desired being determined by the surveyor.

In use the end of the tape m is engaged by hook Z, and then the lever g2 is swung backward until the pointer n indicates the tension desired. The backward movement of handlever g2 will cause a corresponding movement of sector g, so that the strap ZL is partly wound upon the latter, while the rail i moves back'- ward in a rectilinear direction between guides f 2 f3. As soon as the pointer has indicated the tension desired the measurement is taken off the end of the tape m by a plumb-bob in the usual manner. The apparatus is held in position by the foot of the operator resting upon base a, while the lateral movement of standard e permits obstacles to be readily cleared.

What I claim is-'- 1. A tape-stretcher provided with a ivoted sector, la flexible strap connected t ereto at its rear end, a rail secured to the strap at its front end and disconnected therefrom at its rear end, and an indicator secured to the rail, substantially as specified.

2. A tape-stretcher provided with a stand- 4. A tape-stretcher provided with a base, a

standard pivoted thereto, a slide engaging the standard, a sector ivoted to the slide, a iiexible strap connected) to the sector, and an indicator operatively connected to the strap, substantially as specified.

Signed by me at New York city, Manhattan, New York, this 12th day of December, 1905.

GEORGE OERTEL.

Witnesses FRANK v. BRIESEN, ARTEII:a]ZIJi\r1 E'.4A

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