US2721442A

US2721442A - Global clock

Info

Publication number: US2721442A
Application number: US292066A
Authority: US
Inventors: Sr James F Pettigrew
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-06-06
Filing date: 1952-06-06
Publication date: 1955-10-25
Anticipated expiration: 1972-10-25

Description

Oct. 25, 1955 .1. F. PETTIGREW, SR

GLOBAL CLOCK 2 Sheets-Sheet l Filed June 6, 1952 CL 25, 1955 .1. F. PETTIGREW, sR

GLOBAL CLOCK 2 Sheets-Sheet 2 Filed June 6, 1952 w Wm w Q w m V// q Ar/ @L -N /O A i w H8 3. F /d w@ H F W Q e Q E L m A Q 6 i n INVENTOR. JAMES F PETTIQQEv/,Sn BY United States Patent O GLOBAL CLCK `lames F. Pettigrew, Sr., Thomasville, Ga.

Application .lune 6, 1F52, Serial No. 292,066

1 Claim. (Cl. 523-44) This invention relates to clocks. More particularly, it refers to a global clock, adapted to show, at one time, the hour all over the world.

The broad object of the invention is to provide a generally improved clock of the type stated. More specific objects are as follows:

First, the provision of a clock in which a terrestrial globe representing the world will be rotated by a clock works relative to a clock face having not only the hours of the day marked thereon, but also the position of the sun relative to the earth at diierent times during the day, thus to cause the globe to be rotated in the same manner, relative to the sun, as the earth itself rotates;

Second, the provision of time-indicating hands radiating from the globe and rotating therewith, that will permit a viewer to ascertain the hour for any location upon the face of the globe;

Third, the provision of a ratchet-and-pawl mechanism actuated by rotation of the globe, that will enable the viewer to know not only the hour, but also the day of the week, for any location upon the face of the globe.

Other objects will appear from the following description, the claim appended thereto, and from the annexed drawing, in which like reference characters designate like parts throughout the several views, and wherein:

Figure 1 is a front elevational View of a global clock formed in accordance with the present invention;

Figure 2 is a side elevation or" the clock as it appears when viewed from the left of Figure l;

Figure 3 is an enlarged, detail sectional view taken substantially on line 3 3 of Figure l;

Figure 4 is an enlarged detail View on line 4 4 of Figure l;

Figure 5 is an enlarged fragmentary rear View of the ratchet wheel containing casing and associated parts, with a portion of the base broken away and in section, of the assembly of Figure 1.

Figure 6 is an enlarged sectional view taken on the line 6 6 of Figure 2.

The clock formed in accordance with the present invention includes 'a base plate 12 having a flat, rectangular shape and provided with a longitudinal slot 14 in which is engaged the lower end of a vertically depending extension 16 integrally formed upon the periphery of a circular, vertically disposed, stationary frame or dial 18, having a large center opening 20.

Afxed to the base plate 12 rearwardly of and in spaced relation to the frame 18 (Figure 2) is a at support plate 22 to which is iixedly attached the lower end of an elongated, vertical standard 24 of tubular formation. An electric cord 26 extending from a source of electricity is inserted through a suitable opening in the base plate 12, and extends through standard 24, into one end of a horizontal, tubular spindle 28 arranged at right angles to the standard and projecting laterally from the upper end thereof supporting an end plate 36 carrying the legend South Pole. A globe generally indicated 2,721,442 Patented Oct. 25, 1955 52 and formed of a translucent material is mounted on the tubular spindle 28 for rotation, and a translucent covering 54 extends over the full area of the globe and is appropriately marked to provide a global map of the world. Means, not shown, energized from electric cord 26, is drivingly connected with the globe for eiecting once in every twenty-four hours a single rotation of the globe through a full three hundred and sixty degree cycle.

Extending about the globe 52, at the equator marking of the globe is a planiform disc 64 on which are timeindicating hands 64. There are twenty-four of these, each having a widened base extending over one time Zone of the world. The outer ends of the hands are widened and pointed, and are provided (Figure 3) with outwardly extended pins 66 on which discs 68, numbered from one to twenty-four, are freely rotatable. Weights, such as drops of solder '70, are provided on the discs so that the numbers on the discs 68 will be vertical in any position of the hands.

My global clock also has means for indicating to a viewer the day of the week, said means being shown in Figures 5 and 6. This includes a hollow, upstanding casing 118 mounted upon the base plate 12, and xedly secured to the depending extension 16 of the dial or annular frame 18, by triangularly spaced screws 120.

As shown by Figure 6, the screw 120 serves as a shaft on which rotates a ratchet wheel 122 formed with a circumferential series of ratchet teeth 124. Uni-directional rotation, and the retention of the ratchet wheel in each position to which it is rotated, is provided for by a pawl 126 mounted within the casing 118.

On that hand 64 bearing the number 24, which hand is on the international date line 52 of the globe 52, I provide a laterally projected nger 12S (Figures l and 4) disposed for engaging the uppermost tooth 124 of the ratchet wheel, the casing 118 being open at its upper end for disposition of the uppermost tooth at a location where it will be engaged by the finger, By reason of this arrangement, it will be seen that on each full rotation of the globe 52, the ratchet wheel will be advanced one step.

At the upper end of the dial or frame 18, there is an upstanding projection 130, marked with the word Sun," the casing 118 being located diametrically opposite said projection and being marked with the word Midnight Also provided on the frame is an outer, circular series of markings 132, spaced equidistantly about the frame and ascending in order from 0100 hours to 2400 hours, the markings representing the hours of the day as used in the armed forces. As a part of the series of markings 132, there are provided the legends "Sunrise and Sunset, spaced diametrically opposite one another and disposed equidistantly from the Sun and Midnight markings.

Also provided upon the dial 1-, and disposed inwardly of the series of markings 132, is an inner series of dial markings 134, the series 134 including a right hand group of markings ascending in order from l to 12 and extending through one hundred eighty degrees of the dial, from the Sun to the Midnight markings. The series 134 also includes a left hand group of markings also reading from 1 to 12, from the Midnight back to the Sun marking. 1retween each pair of adjacent numerals of said groups, minute indicia 136 are imprinted upon the dial, the indicia between each pair of adjacent numerals representing the minutes of a full hour.

In the front wall of the casing 118, I form an outer window 138, said window comprising a sight opening through which can be viewed any one of an annular, outer series of day markings 140. An inner window 142 is also formed in the casing 118, to provide a sight opening 3 through which can be viewed any one of an inner series of day markings 144.

The outer surface of the casing front wall is suitably printed (Figure 5) to provide explanatory information for a viewer with respect to obtaining a comprehension of the markings 140, 144 seen through the sight openings of the casing 118. In other words, the hand 64 bearing the numeral 24 is on the international date line, and when it advances the ratchet wheel one step, it shows how much of the world is into a new day.

If desired, the location in the world at which the clock is disposed can be marked by a ag 146 or the like.

In use, one need only locate a point upon the globe 52 at which he desires to ascertain the time. For example, one might desire to know what time it is in New York city, at which the ag 146 is located in the illustrated example of the device. Hand 17 is found to be in the appropriate time zone in which the ag is located, and it becomes immediately apparent, as seen from Figure 1, that it is 11 A. M. in New York city.

It is considered worthy of note that the construction of the global clock is such as to make it immediately apparent to a viewer that the globe rotates as does the world itself. In other words, those parts of the world in which daylight exists will be located, upon the globe, on that part of the globe turned upwardly toward the Sun marking, and obviously, those parts of the world which are actually in daylight can be illuminated appropriately upon the globe 52, with the remaining parts of the world being relatively dark.

What is claimed is:

In a global clock, a stationary base; a terrestrial globe including an international date line marking mounted for rotation upon the base; means drivingly connected with the globe for effecting, once in each twenty four hours, a single rotation of the globe through a full 360 degree cycle; a planiform disc having a xed connection to and extending about the globe in the plane of the V equatorial marking of the globe; a series of radial hands marked on the disc and angularly spaced about the circumference of the globe to designate time Zones of the world, one of the hands extending in alignment with the international date line marking of the globe; a stationary,

planiform dial having a circumferential series of clock face markings, said dial being xedly mounted on the base in the plane of the disc and having a center opening receiving the disc and globe; a linger xedly secured to and projecting outwardly from the periphery of the disc at the location of said one hand; a casing xedly mounted on the base and having an index marking extending radially of the axis of rotation of the globe and disc, said casing being formed with sight windows at opposite sides of said marking; a ratchet wheel rotatably mounted in the casing and having a peripheral series of teeth extending in the path of the finger disposed for engagement of one of the teeth by said finger during each 360 degree cycle of rotation of the globe, thus to impart a one step, rotatable advancement to the wheel during each cycle of rotation of the globe; a pair of annular, concentric series of markings on the ratchet wheel designating days of the week, said wheel markings being arranged for viewing of a marking of one series of ratchet wheel markings through one window to show the day of the week existing in the portion of the globe included between the index marking and the international date line at one side of the index marking, and for simultaneous viewing of a marking of the other ratchet wheel series through the other window to show the day of the week existing in the remaining portion of the globe, included between the index marking and the international date line at the opposite side of the index marking.

References Cited in the le of this patent UNITED STATES PATENTS Re. 8,666 iuvet Apr. 8,1879 61,459 Rawson Ian. 22, 1867 238,914 Juvet Mar. 15,1881 270,329 Moore et al Ian. 9, 1883 594,410 Margolis Nov. 30, 1897 1,034,496 Olinger Aug. 6, 1912 1,442,249 Buro Jan. 16, 1923 1,912,305 Phillips May 30, 1933 1,974,357 Eklund Sept. 18, 1934 2,040,322 Mandi May 12,1936 2,615,298 Ferrari Oct. 28,1952