US1790359A - Elapsed time indicator - Google Patents

Description

Jan. 27, 1931. J. a. WEIR ELAPSED TIME INDICATOR Filed Aug. 9. 1929 m n w n Patented Jan. 27, 1931 UNITED STATES PATENT OFFICE JAMES BUDGE WEIR, OF NEW DORP, NEW YORK, ASSIGNOR TO STANDARD MIRROR COMPANY, INC., OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK ELAPSED-TIME INDICATOR Application filed August 9, 1929. Serial H0. 384,645.

This invention relates to elapsed time indictors, and comprises a mechanisnrada ted to be mounted on the front crystal of a c ock or watch, in front of the ordinary hands of the clock, said mechanism including a pair of hands which can be manually set and will remain stationary during the running time, so that by comparison with the ordinary hands the elapsed time will be indicated at the face of the clock.

The invention is particularly useful on automobile clocks or the like, but is capable of use in any relation. I

One form of the invention is illustrated in the accompanying drawings in which Fig. l is a face view of a clock or watch provided with the mechanism. Fig. 2 is an enlarged detail in section.

Referring specifically to the drawings 6 indicates a clock or watch casing and 7 the crystal thereof, and 8 the ordinary hands of the clock, in front of the dial 9.

The crystal 7 has a central opening in which the attachment is mounted. This attachment comprises a gear housing 10 consisting of a cup shaped plate having a front flange lland a rear flange 12, the latter being headed over at the back behind the crystal to clamp the housing in position, a rubber bushing 14 being interposed between the flange 12 and the edge of the opening in the crystal.

The plate 10 has a central bearing through which extends the sleeve 15 of a minute hand 16 which is mounted on the inner end thereof, and this sleeve surrounds the arbor 17 of the hour hand 18 mounted on the inner end thereof. The front end of the arbor 17 carries a gear 19 which meshes with a pinion 20 on the arbor 21, which is fixed, in the plate 10 and carries a gear 22 meshing with a pinion 23 on the quill 15, the gears being in the usual clock ratio so that the hour and minute hands are properly moved. A cupped setting device or knob 24 is fastened to the front end of the arbor 17 by a squared screw 25, the outer end of the knob having a knurled flange 26 which overlaps and surrounds the flange 11 of the gear housing.

By turning the knob 24-the hands 16 and 18 may be set to any desired time and position. To indicate elapsed time, they are set to the same position as the hands 8 of the clock. Thereafter the hands 8 travel according to the running time, at the expiration of which the positions of the two sets of hands may be compared on the face of the clock, and the elapsed time will thereby be indicated at a glance, quite exactly.

The device will be found very useful on automobiles, or in any position where it is desirable to indicate elapsed or running time in a simple and convenient manner,

I claim:

1. An elapsed time indicator for a clock having a dial and crystal, comprising a gear housing mounted on the clock crystal, gearing supported by said housing, hour and minute hands operatively connected to the gearing and working in front of the clock dial, and means to operate the gearing to set the hands.

2. The combination with a clock havin a crystal with a central opening therein, 0? a gear housing mounted in said opening, gearing supported by said housing, hour and minute hands operatively connected to said gearing, and a knob connected to said gearing for setting the hands.

3. The combination stated in claim 2, the hands being mounted behind the or stal.

4. The combination with a clock aving a crystal with a central opening therein, of a gear support fixed in said opening, gearing mounted on said support, hour and minute hands operatively connected to the gearing, and a knob connected to the gearing at the front of said support and rotatable to set the hands.

In testimony whereof, I afiix my signature.

JAMES BUDGE WEIR.

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