US1404794A

US1404794A - Beam compass

Info

Publication number: US1404794A
Application number: US386426A
Authority: US
Inventors: Charles C Reitenbaugh
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-06-04
Filing date: 1920-06-04
Publication date: 1922-01-31
Anticipated expiration: 1939-01-31

Description

C. C. REITENBAUGH.

BEAM COMPASS,

APPLICATION FILED JUNE 4, 1920.

ElRNE 5 Patented Jan. 31

nhau JNVENTU ATT 4 EJEPQEi LE j v BEAM comrass.

cameo. REI'IVENBAUGH, or ROGKISLAND, ILLINOIS.

iaearea in its set position, thereby eliminating the a inconveniences associated with the com passes now on the market.

-Another object of the invention is to provide an improved drawing instrument in which the lead can bequickly removed from the marking leg, when it is desired to insert a new piece therein and thus eliminate the difficulties heretobefore experi enced in removing small pieces of lead from the marking leg.

A other object of the invention is to provide an improved beam compass embodying a graduated beam and a sliding marking post or leg mountedon thebeam, the post or leg having an improved means for engaging the beam so as to prevent accidental movement thereon. a

A still further object of the invention is to provide an improved compass of the above character which is durable and efiicient in use, one that is simple and easy to manufacture, and onc which can be placed upon the market at a reasonable cost.

lVith these and other objects in view, the invention consists in the novel constructioin arrangement and formation of parts, as will he hereinafter more specifically described claimorh and illustrated in the ac companying drawings, forming a part of this specification, in which drawings:

Figure 1 is a side elevation of the improved beam compass. v I

Figure 2 is an enlarged fragmentary longitudinal section taken on the line 22 of Figure 1. I a a a Figure 3 is an enlarged vertical section taken on the line 33 of Figure 1.

Figure 4 is an enlarged transverse section taken on the line 14of Figure 1.

Figure 5 is a detail horizontal section taken on the line of Figure 1.

Figure 6 is an enlarged vertical trans Specification of Letters Patent.

Patented J an. 31 1922.

Application filed June 4, 1920. Serial No. 386,426.

verse section through the improved beam compass showing the means for adjustably holding the marking leg or post in position on the beam. I t

Figure 7 is an enlarged fragmentary vertical longitudinal section through the same taken on the line 7-7 of Figure 4.,

Figure 8 is a detail elevation of the marking pen adapted to be detachably associated with the movable post.

Figure 9 is a detail elevation of the means for forcing the lead fromthe lead carrying leg. V

Figure 10 is an enlarged detail elevation of the leg for carrying the marking lead.

Referring to the drawings, in detail, wherein similar reference characters indicate corresponding parts throughout the several views, the letter A genrally indicates the improved beam compass which includesthe main needle carrying post 15, the beam 16, the adjustable marking post 17,

and the lead extractor The main or needle post 15 includes a central cylindrical body portion 18 which is provided on its opposite sides with flat faces 15) andiwith a bore 20 to conform with the reduced end 21. of the beam 16. The reduced end 21 of the beam is provided with a flat face 22 which prevents the beam 16 from rotating in bore 20. The reduced end 21 of beam 16is provided with a threaded bore 23 in which is fitted. a clamping thumb screw 24. The clamping thumb screw is adapted to engage the outer surface of the main or needle post 15 and to engage in the serrated. as at 2 5, and theend is concave as at26, so as topermit a firm grip to behad thereon by the draftsman. The lower end I of the main or needle carrying post 15is gradually tapered toward its free end, and is provided with a slotted recessed terminal for the reception of the needle 27 which is held in adjusted position against shoe e f-which is provided with an upwardly means of a leaf spring 418 which is carried by the housing and the upper sur lfaee of accidental displacement by a tapered nut 28 which is threaded, in position on the threaded tapered lower portion of post 15.

The beam 16 includes a substantially cylindrical body vith a reduced end 21, and the loweu face of the .body is flattened as at 29 an'd provided with a plurality of equi-distantly spaced transversely extending notches 30 and the forward face of the beam is graduated as at 31 and provided with suitable indicating numbers to conform to the graduations and the recesses 30' so as to permit of the convenient adjustment of the post 17. The extreme outer end of the beam 16 is provided with a head 32 which limits the outward movement of the adjusting marking post housing 88 thereon.

The adjustable marking postl'l' is carried by the housing 33 which is slidably mounted on the beam 16, and this housing includes spaced end plates 34 and anintermediate partition plate 35. The end plates 3 1 above the partition plate are provided on the inner faces with lugs 36, and with openings 37 for the beam 16, and these openings are shaped to conform to the cross sectional configuration of the beam. By this means the marking leg is held perpendicular and parallel with needlepost 15. Y i

The end plates 34 ot the partition plate are provided with aligned-openings 38 for the reception of the adjusting screw-39 which is mounted in the threaded bore 40 of on opposite sides of the lugs 36, and the legs of member all have sec'liu'ed thereto a extending transversely arraii ed tooth lti, which is adapted to eng in any one at the recesses 30. One 01 the oi the U shaped thun'ib pieces 1/1; is provided with a sight opening, 67, the purpose of which will hereinafter more fully appear. I

The outer face of the thumb piece 14 is roughed or serrated as at 47 so as to prevent the slipping of the operators thumb thereon.

Theshoe is normallyheld in engagement with the straight face 29 of the beam 16 by the partitionplate 35 is provided with a .recessedportion a9 for the reception of spring 4,8, Thus it can be seen that lugs 36 act as guides for thumb piece 1 1, and prevent the dissolution of. the marking leg as a whole, when iris desiredto substitute a beam of difi erent length for beam 16.

The lower end of the adjusting marking post 17, is provided with a vertically dis- 'posed'bore 50 for the reception of the legs of the reduced portion 51 of the pencil markingleg 52 and the reduced portion 58 of the pen 5%. The reduced portions 51' and 53 of the lead carrying leg 52 and the pen are slotted as at 55 which permitsof the contraction of the reduced portion when the same is fitted in the vertical bore 50 of the adjusting marking post 17. A pin 56 is carried by the adjusting or marking post 17 and the same extends through the bore 50 thereof and is adapted to fit in a transversely extended groove 57 formed in the reduced portions 51 and 53 of the lead carryingleg 52 and the pen 54. The upper ends of the reduced portions 51 and 53 of the lead carrying leg 52 and pen 51 are inclined as at 58 above the groove 57 so as to permit the flexing of the slotted reduced portions 51 and 53 of the pencil carrying leg 52 and the pen 54 when either one of the same is being placed in the bore 50 of the post 17. The leg 52 is provided with an inwardly extending smooth bore 59 for the reception of the marking lead 60 and-this portionot the lower outer surface of the same istapered as at 62and is provided with external threads 63. Aninternally tapered nut 64: ismounted on the leg 52 and is adapted to bringthe slit portions otthe leg together to holdthe marking lead 60 against accidental displacement. V

The bore 59 of the leg 52has -slidably mounted therein a 'follower 65 of cylindrical formation, which is adapted to push the lead 60 out of the bore when the same has become worn down and the cylindrical fol lower 65 is provided with an outwardlyextending handle or pin 66 which protrudes througl'i the slot fil formed in the leg; Thus it can be seen that when it is desired to relnovethe lead 60 from the bore it is merely necessary to loosen the nut 6 1 so to permit the leg to expandand the followeri s then brought down the bore into eng gement with thelead and thus effectively lorce. the same out o'lf the bore.

When it is desired to substitute the pen 56 rides into the groove 57 formed in its outer surface.

In operation of the improved compass the leg 52 or the pen 54 is associated with the post 17 according to the character of the 7 work being executed, and the thumb piece 44 is moved downwardly against the tension of the spring 48 which moves the tooth 46 from out of engagement with the notches 30. The housing is then moved to the desired place on the beam and the marking thereon can be readily seen through the openingGT provided in the thumb piece id for that purpose. lVhen it is desired to adjust the leg 52 a fraction of an inch, it is merely neces' sary to turn the adjusting screw. 39 which will permit of as fine adjustment as desired. The compass is then used in the ordinary manner.

Various changes in form, proportions, size and details of the device may be had without departing from the spirit or sacrificing any of the advantages of my invention, but,

I claim: a

1. A compass comprising a needle post, an outwardly extending beam carried by the post having a plurality of equi-distantly spaced notches formed on its lower face, a housing slidably mounted on said beam, a thumb piece slidably carried by the housing, a tooth carried by the thumb piece and arranged to engage in any one of said notches, spring means normally holding said thumb piece in a raised position and in engagement with one of the notches, and a marking'post adjustably carried by the housing.v

2. A compass comprising a needle post, an outwardly extending beam carried by the needle post having a plurality of equi-distantly spaced notches formed therein, a housing slidably mounted on the beam, a shoe slidably carried by the housing, a toot-h formed on the shoe and arranged to engage in any one of the notches, spring 3. In a drawing instrument. a supporting post having a vertical bore anda pin carried by the post and arranged in said bore, of a leg having a reduced slotted terminal arranged to fit in said bore, the reduced terminal having a. groove arranged to receive said pin, and provided with an inclined surface arranged above said groove.

it. A compass comprising a needle post having a diametrically extending opening formed therein, the wall of said opening having a flattened portion, a longitudinally extending graduated beam, a reduced extension formed on one terminal of the beam arranged to lit in the opening formed in the post, said reduced extension having a fiattened face for engagement with the flattened portion of the wall of the opening, whereby rotary movement of the beam in relation to the post is prevented, the body portion oi? the beam having a lower flattened face, a housing including end walls and a partition plate, inwardly extending lugs formed on the end walls and spacedi it'rom the upper and side edges thereof, said side walls and lugs having aligned openings for receiving the beam, the walls 1 of said openings having the lower portions thereof flattened for engagement with the flattened face of the beam, whereby the housing is held in parallel relation with the post and against rotation on said beam, the flattened face of said beam having grooves formed therein, a sliding shoe arranged between the end walls of thehousing, a tooth formed on said shoe arranged to engage in any one of said grooves, a U-shaped thumb grip slidably mounted on said lugs and secured to said shoe, said thumb grip having a sight opening therein to permit 01. the reading of the graduations on the beam, and an adjustable marking leg carried by the housing. V

5. In a compass, the combination, with a needle post, and a beam, of a marking post adjustably carried by said beam, and including resilient means forrigidly maintaining said. marking post in position upon the beam.

6. In a compass, the combination, of a needle post; a beam, and a marker post, in cluding a housing slid ably carried upon. sa i d beam, said housing having guide lugs thereon, a substantially U-sluuied thumb piece reciprocably mounted upon said housing, a shoe u'leniber detacbably connected to the open end of said U-sbaped member, a spring detachably carried by said housing, and nor-- i'ually under (unupression to push said shoe into engagement with said beam, and "a. marking point adjustably carried by said housing.

' CHARLES C. REITENBAUGH.