US1847398A - Drafting table - Google Patents

Description

J. W. HURYCH DRAFIING TABLE Marsh 1 1932 21. 1928 s Sheets-Sheet 1 Filed Nov.

m w w $51 M @bbomw March 1, 1932 J. w. HURYCH DRAFTYING TABLE Filed Nov. 21, 1928 3 Sheets-Shet 3 avwemboz Jmme W. flag 6k QM. mm HAM Mm m n QM I MW QM! I WM. I 0% I QM S \A o I KR m/w Patented Mar. 1, 1932 UNITED STATES PATENT OFFICE JEROME W. HURYCH, OF ASTORIA, NEW YORK, ASSIGNOR TO HAMILTON MIANUFAG TUBING COMPANY, OF TWO RIVERS, WISCONSIN, A CORPORATION OF WISCONSIN DRAF'IIVNG TABLE Application filed November 21, 1928. Serial No. 320,925.

The present invention has reference to a drawing board and appertains more especially to an adjustable support therefor.

The main object of this invention is to produce an improved support of the character described, capable of being placed in desired position by one hand of the operator whose foot controls the release of an automatic locking mechanism.

port of the nature set forth wherein the table is so nicely overbalanced as to slowly lift or rise when liberated, but which can be depressed or moved into changed position by 5 a slight pressure of the operators hand.

A further object is to provide a support of the class mentioned with an arrangement of levers the ends whereof on opposite sides of a common pivotal axis are connected withthe table and a counterweight in such a manner as to maintain perfect equilibrium therebetween in all positions. J

Still another object consists in producing a support of the kind referred to, having paired levers forming with the table and counterweight, the sides of flexibly jointed, oppositely disposed parallelograms, main taining equipoise between the aforesaid elements.

A still further object resides in providing a support of the type specified with sets of levers coupled by their corresponding opposite ends to the table and its counterweight,

which levers serve to control the vertical and horizontal movements of the table.

An additional object is the provision in a. support of the species implied, of separate locking means for each set of levers controlling the tables vertical and horizontal movements so as to enable independent adjustments thereof.

A general object is to supply a support for the purpose in view which shallbe of strong and rigid construction; void of costly and complicated parts; readily assembled; convenient to adjust into different positions and firmly locked therein; besides, amenable to economical manufacture.

Other objects and advantages of the invention will in part be obvious and in part be Another object is the production of a sup-- more fully brought out in the detailed de scription hereinafter contained.

The invention consists in the various comj binations and sub-combinations of elements,

arrangements and interrelative disposition of parts, and peculiar features of construction pertaining to the improved support, as herein described and defined in the appended claims.

A practical embodimentof theinvention.

is illustrated in the drawings hereto annexed and wheremz- Figure I is. a side view of this improved Fig. IV is an enlarged fragmentary ele vation, partly in section, of a detail appearing in the middle portion at the left hand side of Fig. III;

Fig. V is also a fragmentary elevation, partly in section, of a detail appearing in the lower and middle portion at. the left of Fig. III

Fig. VI is an enlarged, fragmentary sec tion, taken on the line VIVI of Fig. III, looking downwardly thereon Fig. VII is also an enlarged fragmentary section, taken on the line VII-VII of Fig.

III, looking in an upward direction thereon; and

Figs. VIII-IX are diagrammatic sideviews corresponding in outline to Fig. I, showing some of the various positions in. which the/drawing board may, be placed.

Briefly described, the invention as it exists in the embodiment thereof herein exemplifi-ed, comprises spaced apart legs adapted to stand on a floor. In and between these legs or stands, is rotatably supported a solid shaft to the outer free ends of'which are fastened double-armed levers. The oppositeterminals of the latter are pivotally connected to a part on the drafting table and to arod Whereon is hinged by their upper portions a couple of counterweights. A tubular shaftis revolubly carried by the solid shaft intermediately of the before named floor stands. In proximity to these stands are secured to the hollow shaft another set of levers angularly offset with respect to the ones first mentioned. The second set of levers have their terminals coupled up by means of links to the table and to the lower portions of the aforesaid counterweights. Both sets of levers, located on opposite sides of one of the stands, are provided urged detents, serving to retain the racks and the thereto attached levers in predetermined positions. Foot actuated pedals joined thru the agency of flexible connections to the detents, are capable upon being depressed of retracting the same when it is desired to change the interr-elative zn'ljustinents of the levers and the thereon depending inclination as well as height of the drafting table.

Obviously, the greatest benefit will be derived from the invention by using it in its entirety after the manner hereinabove ex pressed, altho it may we noted that an operative support of acceptable design may be produced by employing a less number of parts with correspondingly diminished advantages. Furtl'ier will be observed by experts familiar with inventions of analogous import, that the combined double sets of levers direct and indirectly connected to the drafting table and to the counterweights, as well as the detent releasing mechanism herein disclosed, are susceptible of various modifications having the same endin View. Therefore, let it be understooththatthe annexed drawings are offered by. way of example only, and are not put forth as representing the sole means of reducing the invention to practice.

As illustrated on the said drawings,- the support constituting the present embodiment supported a shaft 15 which by preference is of the solid type. To the free, opposite terminals of this shaft is secured, as by keying, a pair of levers 16 ha ing central hubs which areheld in oii'set relation to the outer faces of bearings 1st, 1 1a, by spacing collars 1? interposed therebetween. Intermediately of the inwardly turned faces of the last named bearings, is revolvably carried abont the shaft 15, another but hollow shaft 19. Levers 20' have their hub portions afiixed to the tubular shaft 19 by keys or other appropriate contrivances.

t will be observed with particular reference to Figs. 1, II and III of the accompanying drawings that both sets of the levers 16 and 20 are composed of un-equal arms (16) 16c and (20)20a, respectively. ()f these arms, it to note, that the ones designated. 120a are longer than lever arms 16a. outer ends of the longer arms (16) of the with semi-circular racks engaged by spring.

The

first mentioned set of levers are pivotally connected by means of brackets 22 to the lowor forward portions of bar-like cleats 3 which may serve as backing strips reinforcing the drafting board or table B, or to any other parts to which the latter may be attached. 'Thru the same ends of the shorter arms 1-3:; ofthe identical levers, is passed rod 2% whereon is hinged by their upper portions one or more counterweights 25, generally a pair thereof, depending upon the size and heaviness of the table to be balanced.

The corresponding ends of the other arms (20) pertaining to the second set of levers are flexibly coupled to brackets 22a similar to those first named, by links 26. Said second set of brackets 22a are attached to the aforenamed parts 23, altho to the reverse sides thereof, with respect to the brackets 22, previously referred to. The shorter arms 200 are jointed in a like manner, but individually or by separate pivot pins 27 to the adjacent lowe portions of the counterweights 25, thru the agency of shorter links 28. It will be understood, that for a rather narrow or lightweight table, when only one counter-balance is needed, both of the links 28 can be movably connected thereto. Obviously, for very small boards or easels, the employment of single links 26 and 28 is contemplated. If desired, the weights may be built up of platelike sections 25a held together by bolts 25b, admitting of additional lamina; being includedin the assemblage thereof to increase the weight/ rom the foregoing it will be seen that around-the bearings of each of the floor stands, there is mounted to oscillate, in planes parallel with the sides thereof two sets of different size parallelograms. The larger ones of the latter, consist of the longer arms (16)-(,20) and links 26, strips 23 closing 7 these parallelograms intermediately of the pivot-brackets2222a. On the opposite side of the concentric shafts 1519, thesmaller parallelograms include the shorter arms mew-20a, links 28, and the counter-weights, the distance between the pivots 2427 thereof, completing thelast named parallelograms. By virtue of the reason that the arms'16a- 2041 being of considerably shorter lengths than the other set of arms (16)(2O) so asto reduce the space occupied in rear ofthe stands 1'111'a by the weights 25, the same are therecomprises in the present embodiment of the invention, senn- cn'cularracks 30, 31. For

the sake of convenience, said racks maybe formed as integral extensions to the under and rear edges of the arms (16)l6a and (20)20a, respectively. These segmental appendages which by preference are disposed only at one side of the table, e. g. at the left hand stand 11a, areprovided with rounded teeth a,31a, arranged concentrically with relation to the levers common p'votal centre about the aiiis of shaft 15. Detents on the order of studs 32, adapted to enter between the teeth or dentations 30a, 31a sidewise, hold racks 30.31, respectively, from being swung one way or the other, when in engagement therewith. Studs 32, 33, as most clearly seen from Fig. VII, extend from the sides of the latch-levers 84, 35, affixed as by pinning them to spindles 36, 33, respectively. These spindles are journalled in bearing bosses 38, 39, projecting in a front and rear direction from the left hand stand 1.1a, a given distance below tll,tl118f10 appertaining upper bearing lea, being as shown, disposed on a horizontal line substantially tangential to the periphery of thesaid racks. The aforementioned latchlevers and detent studs are urged automatically upward against the rack dentations. The instrumentality performing this function may consist as illustrated, of a single resilient element in the nature of a contractible spring 41. The latter can expediently be anchored by its extremities to eyes provided in the ends ofears 4L2, 43 that depend from the'underside of a separate hub 4d and from the hub of the latch lever. respectively. The means for individually retracting the latch-levers in o der to release the curved racks, may be composed of cables, chains or other yielding mediiuns,depicted by dot- anddash lines 46, 47, in Figs. 1 to V. As represented, the last. named connections are attached to eyes formed in ears d8, 49 (Figs. I and 11). Of these ears, the one denoted 48, reaches downwardly from the lower side of the latch-lever Set, while the other ear 49 is provided as an adjunct to the latch lever 35. Fixed to spindle '37, at the end thereof opposite to the lever 35, is a collar 50 maintaining it in axial alignment.

The cables spoken of, are passed over individual sheaves 52, 53 rcvolubly mounted on opposite sides of the stand 11a upon a stud or bolt 55 supported in any suitable manner therein. With the lower front part of the:

base 12a of the said stand, is formedabear ing boss 56 wherein is carried a stub shaft 57' having pedals 58, 59 loosely mounted. on the outer ends thereof. Said pedals which have reversely offset foot rests 58a, 59a, may be maintained in their axial alignment, by cotter pins with interposed washers, as most clearly represented in Fig. VI. At the rear portions of pedals 58, 59, the same are formed orconnected with arms 60, 61 provided with ears to which are fastened the lower terminals of the flexible mediums 46, f? respectively. The latter as before stated, control the latchlevers 3435, dentated segments 30-31, and the conjoined arms (16) 16a and (20) '20a, that directly and indirectly engage the-table B and weights 25, respectively. For the purpose of locating the afore-named pedals in the most advantageous positions, i. e. within reach of the operators feet, there is cast: or otherwise attached to the outer'and inner faces of the basal portion of the stand 11a, stops 62,

63, disposed in the arcuate paths followed by arms 60, 61 respectively. The stops referred to serve to limit the rearward and upward swinging movements of the said arms and the therewith associated peda1s58, 59respectively. From the foregoing description 1t will be comprehended that at such timesas a draftsman seated by table 13, names both feet on the pedals, thus releasingthe two racks 30, 31, the table will riseor lift due to the preponderance of the weights 25 acting thereagainst. If only the left hand pedal 58 is depressed, retracting the latch lever 3% from the dentations 30a, the double-armed levers 16,011 the central shaft 15 become liberated for an up and down adjustment of the draft ing tables front edge. If on the other hand," theright pedal 59 alone pushed down, it'is' the second set of levers 20 on" the tubular shaft 19, which are released, and may at optionhave their positions changed to shift the drawing boards upper edge in a front and rear direct-ion. By reason. of the fact all conneetions of the levers with the table and weights as well as the detent mechanism; are pivotal, the friction therebetween is so slight that the mere touch of a persons hand suffices to effect every change desired. Immet iately one or both feet are removed from the pedals, the latch levers under influence of spring' fl reset themselves in engagement with the segmental racks without any other tightening means being needed. The draft-smanshands are always free to manipulate the table and to manage those of his implements or instruments generally reposing thereon. All of the above enumerated features contribute in making the support under consideration affords the draftsman working at a board mounted on a support constructed in accordance with the description hereinbefore contained. Some of the various positions in which this counterbalanced table may be placed, is illustrated by Figs. VIII and IX. As therein shown, the same elements to the ordinals whereof hasbeen added suffixes, denote corresponding positions of the table and the counterweight. From these views it will be apparent that either short or tall persons may use the table or work at the upper and lower edges thereof with equal convenience.

In its broader aspects, the invention herein disclosed is not limited to the precise features of construction and arrangement of parts shown and described, nor to the particular structural make up or design by which it can he reduced to practice, as numerous changes may be made in the details without departing from the principles of the invention, or even sacrificing any of chief advantages.

Having now described my invention, what I claim as novel therein and desire particularly to protect by Letters Patent of the 7 United States, is

1. A support for drawing tables and the like, including levers independently pivoted in crossed relation one to the other about a common axis, a table attachment part and a counter-weight flexibly connected near the of said levers forming therewith and with the other lever three sides in each of oppositely disposed parallelograms, a table attachment part forming the fourth side of one of said parallelograms and a counterweight completing the other of said parallelograms, and means pivotally connecting the levers and said links with the last named elements thereby completing said parallelograms.

3. A support for drawing tables and the like, including separate levers pivoted inwardly of their ends in offset relation thereto about a common centre to provide longer and shorter portions, a table attachment part and a counter-weight respectively connected to the longer and shorter portions of one of said levers, links similarly connecting the corresponding portions of the other lever with said attachment and counterweight, and mechanism for independently locking the said levers in adjusted positions.

l. A support for drawing tables and the like, including a table attachment part and a counterweight, levers and links pivotally connected up with said part and said'weight forming on both sides of a common centre,

oppositely disposed closed parallelograms maintained in constant equipoise, members carried by each of said levers, pivoted elements coacting with said members to hold said levers locked, and means for oscillating said elements to release the levers when changing the position of the said table part.

5. A support for drawing tables and the like, including a stand, levers pivoted independently of one another at opposite sides of said stand, a table attachment part and a counterweight direct connected to the opposite outer ends of one of said levers, links coupling one extremity of the other lever to said part, and other links connecting said weight with the opposite end of the last mentioned lever.

6. A support for drawing tables and the like, includinga table attachment part and a counterweight, levers pivotally supported in crossed relation independently of one another, one of said levers having its extremities connected directly to'the lower and upper portions of said part and said weight respectively, and links connecting the corresponding ends of the other lever to the opposite portions of the part and the counterweight respectively, the connections of said lever and said links with the last named ele ments being spaced at distances apart equalling the effective length of the link connected lever. V

7'. -A support for drawing tables and the like, including a table attachment part and a counterweight, a pair of brackets attached to said part, a lever pivoted intermediate its ends directly connected by said ends to one of said brackets and to a part on said weight, and another lever similarly mounted and flexibly connected at its ends respectively with the other bracket and a different part of the said counterweight.

8. A support for drawing tables and the like, including floor stands spaced one from the other, a shaft having its hearings in said stands projecting therebeyond, a set of levers fastened to the projecting portions of said shaft, a tubular shaft mounted to revolve around the latter intermediately of the stands, another set of levers secured to said tubular shaft in proximity to the said stands, a table attachment part and a counterweight, means coupling said first set of lovers direct with said part and said weight, and other means indirectly connecting said second set of levers with the last named elements.

9. A support for drawing tables and the like, including a pair of floor stands, a shaft journalled therein extending beyond the same, a tubular shaft revolvable around said first shaft intermediately of said stands, a table attachment part and a counterweight, a set of levers aflixed to the extending portions of the first mentioned shaft connected directly to said part and said weight, another set of levers secured to the ends of said tubular shaft coupled indirectly to the last named elements, coacting members carried by one of the stands and one of each of both sets of levers capable of holding the latter locked in various positions, and pedals controlling the release of the stand carried members.

10. A support for drafting tables and the like, including a pair of stands, a main shaft rotatably carried by said stands, a set of levers aiiixed to said main shaft, a hollow shaft revolubly mounted upon the latter, a set of levers secured to said hollow shaft, a table attachment part and a counterweight, means flexibly connecting adjacent ends of the hollow shaft levers with said part, means flexibly connecting adjacent ends of the main shaft levers with the said part and spaced from the hollow shaft lever connection therewith, means flexibly connecting opposite ends of said hollow shaft levers with said counterweight, and means flexibly connecting the opposite ends of said main shaft levers with said counterweight in spaced relation to the hollow lever connection therewith.

11. A support for drafting tables and the like, including floor stands, a main shaft rotatably carried in said stands, a set of lever arms affixed to said main shaft, a hollow shaft independently revolvable around the latter, a set of lever arms secured to said hollow shaft, atable attachment part and a counterweight, means flexibly connecting adjacent ends of the hollow shaft arms with said part, means flexibly connecting adjacent ends of the main shaft arms with the said part and spaced from the hollow shaft arm connection therewith, means flexibly connecting the opposite ends of said main shaft arms with said counterweight in spaced relation to said hollow shaft arm connection therewith, means associated with one of the stands for independently locking each shaft, and separate foot operated means controlling each of said locking means to release either of said shafts.

12. In a drafting table support, a pair of levers arranged in crossed'relation and pivoted about an axis common thereto, a table part and a counterweight, one of said levers being flexibly connected at its ends respectively with end portions of said part and counterweight, links coupling opposite extremities of the other of said lovers with other end portions of the said part and counterweight and spaced from the connections of the first lever therewith, and locking means for each of the said levers.

JEROME W. HURYCH.

Images