Патент USA US2094833код для вставки
Oct. 5, 1937. J, McAULlFFE 2,094,833 PORTABLE SUNDIAL Filed Dec. 31, 1956 2 Sheets-Sheet“ l INVENTOR. 1055p” MWuuF/Z. BY I %% ‘ ATTORNEY. Oct. 5, 1937. J. MCAULIFFE 2,094,833 - PORTABLE SUNDIAL Filed Dec. 31, 1936 _ 2 Sheets-Sheet 2 .7‘ -_4_ _ INVENTOR BY 1555p” M9400”: WTTORNEY. 2,04,833" Patented Oct. 5, 1937 UNITED STAT ATENT oFFi 2,094,833 PORTABLE SUNDIAL Joseph McAuliffe, Idaho Springs, Colo. Application December 31, 1936, Serial No. 118,529 4 Claims. (Cl. 33-452) This invention relates to a portable sun dial and has for its principal object the provision of a neat, compact, highly ef?cient unit which can be used to determine the hour of the day by the 5 sun in any latitude, and which can be easily car ried upon the person. It is more particularly designed for use by campers, hunters, travelers, and explorers who might lose or damage ordinary time pieces and 10 who have no access to a clock. It is also valu able ior instructing classes in schools, boy scout troops, etc., in the fundamentals of time deter~ mination and astronomy. ' Other objects and advantages reside' in the 15 detail construction of the inventiomwhich is de signed for simplicity, economy, and e?‘iciency. These will become more apparent from the fol lowing description. In the following detailed description of the in 20 vention reference is had to» the accompanying drawings which form a part hereof. Like numer als refer to like parts in all views of the drawings and throughout the description. In the drawings:— 25 ‘ i the invention. Fig. 4 is a longitudinal section through the form of Fig. 3, taken on the line 4—4, Fig. 3. Fig. 5 is a detail view of the roll‘ operating mechanism of the form of Fig. 3. cates positions on the dial 22. The dial is in dexe-d in all of the latitudes in which the inven- 5 tion is expected to be used. A scale running from 20° to 60° is usually all that is necessary. A calendar is printed or engraved upon the plate I6, as shown at 25. The calendar is printed in two sections, with the months from July to 10; November at one side, and the months January '60 May at the other side, and with the two re maining months June and December at the ex tremities as illustrated. The calendar is accu rately laid out by projection from a declination 15 scale lid on the latitude plate 33. The declination scale is indexed to a mid-leap-year declination. The two sections of the calendar are separated by means of a calendar slot 26. A ?exible string 27 terminating in a plumbweight 28 extends 20 through the slot 26 from a suitable head on the back thereof. The weight 28 is slidable along the string 2? and may carry an indicating pointer 42. Below ~the plate Iii on the board II] is a remov ' Fig. 1 is a face view of one form of the improved portable sun dial as it would appear in use. Fig. 2 is a side view thereof. Fig. 3 is a face view of an alternate form of 30 Adjacent the slot 20 is an arcuate latitude in dex or dial 22 which is visible through a window 23 in the plate l6. An indicating arrow 24 indi ' The invention comprises a board In, of any 35 suitable material such as cardboard, wood, bake able time chart 2.‘! which may be clamped thereon 25 by means of clamp nuts 30‘. Upon the time chart 29 are two hour circles 3| and 32, the circle 35 designating the A. M. hours, and the circle 32, the P. M. hours. The time indications of each hour circle are joined to those of the other by 30 means of a series of vertical guide lines 43. The charts 29 must be changed to correspond with the latitude of. the place where the dial is to be used. As illustrated, a “Lat. 40” chart is shown on the board Ill. ' 35 lite ?ber, etc. At the top of the board are two ' In use, the user turns the flaps ll and i2 to hinged ?aps II and I2. The face of the ?ap H the vertical position as illustrated. He then sets is provided with a narrow slot l3 and the face of the ?ap I2 is provided with a. vertical indi 40 cating line M. The flaps H and I2 are mounted upon suitable hinges 15 so that when not in use, they may lie ?at against the board I0 and, when in use, they will stand upwardly at right angles to the surface of the board and parallel to each 45 other. The slot I3 is aligned with the line H! on a horizontal line 4| across the board. A latitude plate I6 is pivoted upon a suitable pivot rivet extending through the board I 0. Ad jacent the rivet H, the latitude plate passes 50 through an arcuate slot l8, and is secured to the board on the rear face thereof. The plate I6 can be set at any desired angle by means of a clamp screw i9 which passes through an arcuate slot 20 and terminates in a clamping head 2| on 55 the rear of the board. his latitude plate it on the dial 22 to correspond with the chart 29 and with the place of use. As illustrated, the plate is set“ at 40° latitude. He 40 now slides his string 2'! along the slot 26 to bring it opposite the approximate day of the month. He now swings the string 21 over the I2 noon mark on the hour circles (which is directly over the pivot point of the plate it) and slides the 45 . Weight 28 along the string until the point of the indicating arrow #12 indicates the exact noon point. The board is now set for use. By holding the board ill in a plane intersect ing the sun and inclining it to the proper angle, 50 the sun’s rays will shine through the slot l3 form ing an image on the flap l2. By tilting the board to the right or left, this image is brought directly upon the line 14 of the flap 12. At this time the string 27, due to its weight 28, is hanging verti- 55 2 ' 2,094,833 cally across the time chart 29 and the indicating ' with a ray from the sun; a movable plate on said board; a ?exible member depending from said arrow 42 on the weight will indicate a certain one of the vertical guide lines 43. If it is morning the time can be read by following this line up ward to the A. M. hour circle SI, and ifit is after noon, the hour is read by following the line down ward to the P. M. hour circle 32. As illustrated the dial is indicating either A; M. or P. M. de pending, of course, on whether the dial is being used in the morning or the afternoon. By care ful holding and accurate manufacturing, the time can be foretold accurately in ?ve minute intervals. 7 Ordinarily, the device will be used in the same latitude at all times so that the chart 29 need not be oi‘ten changed. For travelers or explorers, however, who are constantly changing their lati tude, the charts must be constantly changed to correspond thereto. An alternate form of the 20 invention to facilitate this constant change is shown'in Figs. 3 and 4. V r ' In the latter form a latitude plate 33“, similar to the plate I6, is pivoted on a side bracket clip plateyan hour scale intersected by said ?exible member when said board is in alignment with said ray; a latitude scale’ upon said board; means for aligning and setting said'plate at a desired indication on said latitude scale; a calendar scale ‘on said plate; and means for varying the posi tion of said flexible member with'reference to said calendar scale. ' . V 10 V 2. A portable sun dial comprising: a ?at board; a pair of upstanding members parallel to each other on said board, there being a slot in‘ one of said members and an alignment indication on the other of said members to align said board with a ray from the sun; a movable plate on said board; a flexible member'rdepending' from said plate; an hour scale intersected by said ?exible member. when said board is in alignment with i said ray; 2, pair of rollers extending laterally of said board; and a-continuous strip of flexible material reeling from one roll to the other for car rying a series of differing hour circles. 3. A portable sun dial comprising: a ?at board; a declination platepivoted adjacent one side edge 34, so' that it extends over the 12 noon point on a time chart printed on the face of a relatively of said board so as to swing over the face there long1paper strip 35. The strip 35 contains a se of’; a latitudescale for determining the position ries of time charts 36, each laid out for a' par-. ticular latitude. The latitude for which each> of the said declination plate; means forrlocking chart is to be used is indicated by an indexsuch said plate at any desired position on said latitude scale, said plate having a slot extending across 3O 30 as shown at 3?. The strip 35 reels and unreels its face at right angles to a radius extending to from a pair of rollers '38; operated from a thumb button 39, on the side of the device. The thumb its pivot; ‘a plumb line depending from said slot downwardly over said board; a calendar scale button may operate the rollers directly, or it may be connected with both rollers through suitable along said slot for determining the point of sus gears 44 and friction discs 45, as illustrated. pension of said plumbrline; van hour scale below’ .35 This enables the user to quickly change his time said declination plate over which said plumb line charts to correspond to the latitude of the place extends; and means for aligning said plate with a ' ' I r of use. VAs each; chart is brought into position ray from thesun. its 12 noon point mustbe brought directly be ' 4. A portable sun dial comprising: a ?at board; 40 neath the pivot point of the latitude plate. This .a declination plate pivoted adjacent one side edge positioning is facilitated by printing an indication 45 on the strip at each time chart to’ be aligned with a corresponding indication 47 on the board. of said board so as to swing over the face there of ;V a latitude scalerfor determining the position of the said declination plate; means for locking While a speci?c form of the improvement has’ ' said plate at any desired position on said latitude 45 been described and illustrated herein, it. is de sired to be understood that; the same may be varied, within the scope of the appended claims, without departing‘f-rom the spirit of the inven tion. _ . . Having thus described the invention, what is claimed and desired secured ,by Letters Patent is:-— ' 1. A portable sun dial comprising: a ?at board; a pair of upstanding members parallel to each other on said board, there being a slot in one of said members and an alignment'i'ndication on the other of said membersgto; align said’ board scale, said'plate having-a slot extending across its face atright angles to a radius extending to its pivot; a plumb line depending from said slot downwardly over said board; a'calendar scale along said slot for determining the point of sus pension of ‘said plumb line; an hour scale below 50 said declinationv plate over’which said plumb line extends; means for aligning said plate with a ray from the sun; and a head .member on said plumb line preventing the'ilatter froinpulling from said slot, said head being clamped between said dec-. lination plate and said flat board. ' a ' “JOSEPH a McAULIFFE. '