US1186174A

US1186174A - Endless driving-belt.

Info

Publication number: US1186174A
Application number: US675313A
Authority: US
Inventors: Carl Eloesser
Original assignee: ELOESSER KRAFTBAND GmbH
Current assignee: Eloesser-Kraftband-Gesellschaft M B H; ELOESSER KRAFTBAND GmbH
Priority date: 1907-03-04
Filing date: 1912-02-03
Publication date: 1916-06-06
Anticipated expiration: 1933-06-06

Description

C. ELOESSER.

ENDLESS DRIVING BELT.

APPLICATION FILED FEB. 3. 19m.-

1 1 86, 1 74 I Patented June 6, 1916.

Wncssea Mw M COLUMBIA 'PLANoanu-H cu., wAsmNa-rov D c UNITED STATES PATENT OFFICE.

CARL ELOESSER, OF CHARLOTTENBURG, GERMANY, ASS-IGNOR TO [Ill-I111. FIRM 0F ELOESSER-KRAFTBANDGESELLSCHAFT M. 13. H., 0F CHARLOTTENBURG, GER- MANY.

ENDLESS DRIVING-BELT.

Specification of Letters Patent.

Patented J une 6, .1916.

Original application filed March 4, 1907, Serial No. 360,585. Divided and this application filed February 3,

' 1912. Serial No. 675,313.

'is a specification.

The invention relates to driving belts, and more particularly to means for predetermining the required length of endless metal driving belts, such as described in my application for patent filed on March 4, 1907,

Ser. No. 360,585, of which this application is a division.

In the use of an endless metal driving belt it is of prime importance that the belt be given exactly the required tension, as too great a tension will be detrimental to the life of the belt and also to the shaft-bearing, while too small a tension will cause the belt to slip olf the pulleys. In determining the tension allowance must be made for the sagging of the belt, especially where long belts are used, and it is, therefore, a diflicult problem to predetermine the tension of such a driving belt.

By describing my new tensioning device I will shov how the required length of the driving belt and its exact tension can be predetermined, so that, when the belt is placed around the pulleys, its tension will neither be too large nor too small. For this operation a measuring band of the same material as the driving belt but of smaller width and cross-section in combination with the tensioning device referred to is mounted on the pulleys intended for the driving belt, and after the measuring band has been subjected to the required tension by said tensioning device, its length may be measured by a suitable measuring device. In this way the length of the driving belt can be exactly predetermined with a proper allowance for shortening due to the sagging of the belt, as the measuring band, though of smaller cross-section and width, will have the same sag as the driving belt. With the aid of my new device one is, therefore, enabled to make driving belts of the exact length within a fraction of a millimeter.

In order that my invention may be more clearly understood, reference is had to the accompanying drawing, in which, by way of an example, one form of a tensioning apparatus, as used for carrying out my invention, is illustrated, Figure 1 being a side elevation of the apparatus, part of the measuring device being shown in section, Fig. 2 a front elevation of the casing containing the measuring spring.

7 According to the drawing, the apparatus consists of two lever arms 0, (Z, connected by a post 6 and carrying at their free ends the clamping blocks a, 6, for holding the measuring band. Arm d is secured to post 6 in fixed position by screws or the like, whereas arm 0 is held on the post by a pivot pin 7", allowing said arm to be swung toward or away from arm 03. The forward ends of the arms 0 and d are coupled by a screw bolt 9, on which is placed a nut k, so that upon tightening the latter, the free ends of the arms are moved toward each other, and the measuring band clamped by the blocks a and b is stretched. On the bolt 9 are placed two disk-shaped abutments h, i, one below arm d, and the other above arm 0, each abutment being provided with a knife edge adapted to enter corresponding recesses in said arms. Against disk It abuts one end of a helical spring Z, which is inclosed in a cylindrical casing a supported by said disk, and the other end of which spring abuts against a cylindrical cover 1?. adapted to telescope on said casing. The latter is provided with a graduated scale '1', whereby the tension of the measuring band as measured by said spring Z will be indicated, as the lower edge of the cylindrical cover m moves over the said scale. After the measuring band has thus been adjusted by the means of the thumb screw 70 to the required tension, while the tension of the measuring spring has been observed on the scale 1', either of the two ends 0, 70, of the measuring band, one overlapping the other between the lever arms 0, d, may be cut 05, and the remaining length be used to determine the length of the driving belt.

Where the measuring band itself is provided" with a scale, the length of the belt can be easily ascertained by the measuring band, in which case, of course, the overlapping end of the latter is not cut off.

I claim as my invention:

1. A device adapted for application to pulleys in the manner stated, comprising a measuring band of the same material as, but of smaller cross-section than the driving belt, clamping members for the ends of said measuring band, means for tensioning the measuring band around the pulley, and means for measuring the amount of tension.

2. A device adapted for application to pulleys in the manner stated, comprising a measuring band of the same material as, but of smaller cross-section than the driving belt, clamping members for the ends of said measuring band, means adjustably connecting said clamping members, including a screw gear to tension the band around the pulley, and means for measuring the amount of tension.

3. A device adapted for application to pulleys in the manner stated, comprising a measuring band of the same material as, but

of smaller cross-section than the driving belt, clamping members for the ends of said measuring band, adjustable levers carrying said clamping members, means connecting said levers including a screw gear, a measuring spring controlled by said screw gear, and means for disclosing the amount of tension.

4:. A device adapted for application to pulleys in the manner stated, comprising a measuring band made of the same material as, but of smaller cross-section than the driving belt and provided with a scale, clamps for the ends of said measuring band, adjustable levers carrying said clamps, means connecting said levers including a screw gear, and a measuring spring controlled by said gear.

In testimony whereof I hereto afiix my signature in presence of two witnesses.

CARL ELOESSER.

Witnesses HENRY HASPER, lVOLDnMAR HAUIT.

Copies 0! this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents. Washington, D. G.