Патент USA US2409942код для вставки
Oct. 22, 1946. I E. L. KENT 2,409,941 INTERVAL CONTROL MECHANISM Filed Jan. 5, 1944 (Eg/Qui I i, (fw /F/šg. 2 “gg/3:3 20: h 116 15,) 1345 176 (14 ' 28 /4 Patented Oct. 22, 1946 2,409,941 UNITED sTATEs 412.2!:1'1.EurIïá oFFicE . 2,409,9411 INTERVAL CONTROL .MECHANISM Earlc L. Kent, Elkhart, Ind., assignor'toC. G. Conn, Ltd., Elkhart, Ind., :av corporation of Indiana Applicationianuary 5, 1944, serial'No. 517,025 ' ~ 7 Claims. < oi. .zoo-_33) l 2 This-invention relates to -interval control mech anism and more particularly to switching mecha nism for supplying an electrical impulse of ypre determined duration. One of the objects of the invention is to provide vand attheir opposite ends pivoted to a blockv 23 -on the base. These arms being parallel serve to interval rcontrol mechanism in which the duration of 'anl electrical impulse can be -accurately ad -guide the carriage and hold it against rotation while permitting it v'to move along the drum. In operation-the drum is rotated >and the y'car riage is moved along i't from initial position shown in Figure '2 to a ?nal position shown in Figure 3. In- the initial position the brush [39 engages the conducting portion l5 of the drum, while the micro second. 10 brush 20 engages the insulating portion I'4 at one end> of the drum. Asïthe carriage is moved-axially Another object is to provide interval control §usted~. In the constructionyshown the »duration of an impulse can be adjusted in fractions of a mechanism in which duration of an impulse is determined by »a pair of spaced brushes moving over a contact drum. Adjustment of the- inter of the drum, the brush 2'6 will pass across >the shoulder FIi on to the conducting portion l5 to establish a circuit between the brushes. 'This cir val is laccomplished in this construction by ad 15 cuit will be maintai-ned until the leading brush 19 movesacross the shoulder ll at the right end vjusting the relative positions of the brushes to of the drum to interrupt the circuit. Thus the vary the time both brushes engage a conducting interval duringÅ which the circuit is maintained portion of the drum. ' will depend upon the relativ-e positions of the Still another object of the» invention is to pro I vide interval control mechanism in which safety 20 brushes. In order to adjust the brush Z-U-to provide the means are provided to prevent closing a circuit ' desiredV interva-l, the collar 2| is Aformed at one between the brushes during resetting of the mech end withscale markings having calibrations 24 anism. thereon for one scale indication and calibr-ations The above and other objects and advantages will be more readily apparent from the following 25 25 for- a second scale indication. Preferably the description when read in connection with the-ac two scale indicationsv are in different Vcolors so that they may be readily distinguished. One of companying drawing, in which the scale indications cooperates With a reference Figure l is a plan lview of an intervalV control mark 26 on the sleeve IB and the second scale mechanism embodying the invention; and Figures 2 and 3 are partial -diagrammatic views 30 indications cooperate with a similarV axially spaced mark 21. The marks 26 and 21 may be show-ing the mechanism in different positions. 4 The apparatus shown in Figure 1 comprises a colored to correspond to the scales for easy read ing. As the collaris turned indications are ?rst base lo on which is mounted an electric motor H. The motor is preferably a synchronous or obtained on the scale 24 opposite the reference constant speed motor of suf?cient power to drive mark 26, the reference mark 21 at this time being the apparatus without any substantial variation spaced axially from the collar. As the collar is inspeed during the cycle of operations. As shown, turned-further it moves up on the reference mark the motor may be controlledby a switch 12. 27 and the interval may then be read opposite The motor shaft carries at its outer end a drum: this mark on the scale 25. The scales are prefer l-3 'as shown in Figures 2 and 3 formed with in 40. ably~calibrated in micro seconds so that the inter val can 'be-adjusted accurately in fractions of a sulatedl end portions vM and a conducting central second. portion |5. The several portions of the drum are The carriage is moved along the drum by a connected along helical lines l6 terminating in feeding mechanism including a cylindrical feed abrupt shoulders Il. While the drum has been shown with the ends of insulating material- and 45 member-28 on the motor shaft having plain cy lindrical end portions 28. with a helical thread the centerV portion of conducting material, it will 29 therebetween. The pitch of the thread 29 be--understood- that this arrangement could be re is the, same as that of the helical lines l6 so that versed. A- carriage is provided movable axially of the as the carriage is> advanced the brushes will move drum and as> shown in Figure 1 is formed/by a parallel to the> lines 16. . sleeve IB ?tting over the drum. The sleeve car The ycarriage has pivoted thereon a lever 3| ries a pair of spaced brushes one indicated at 19 which carries at one end a follower pin 32 adapt being fixed in the-sleeve and'the otherfshown at ed tojengage the threads 29 to advance the car riage. V'I'helever 3I-may be normally urged in va 20-being carried by a kcollar 21 which is threaded position to engage the feed member by a spring on the sleeve. The-threads connecting thercollar 2| -to the sleeve» are preferably of the same axial orv thelike not shown and may bev moved out of engagement withl the feed memberby al handle' pitch as the helical lines l6. ~ ~ The carriage is held against rotation while be 33V onA the end'ofth'elever. ' ' ' * ing permitted to move axially of the drum by a The carriage is shown in Figure 1 in its initial pair of arms 22 pivoted to the carriage at one end 60 position in which the follower pin 32 engages the 2,4oa941 cylindrical portion 28 to the left of the threads 29. The carriage is urged toward the threads by a spring 34 and is held in its initial position against a spring tension by a latch 35. Prefer ably, adjustable stops 36 and 31 are provided to limit the initial and final positions of the carriage. 'I'o operate the mechanism with its carriage in initial position as shown in Figure 1 and with 4 the carriage engageable with the feed screw to move the carriage axially of the drum, a pair of brushes on the carriage engageable With the drum, a collar threaded on the carriage coaxial with the drum Carrying one of the brushes, the threaded connection between the collar and car riage having the same axial pitch as the feed screw and said helical lines. 4. Interval control mechanism comprising a the motor I l running, the latch 35 is released. The spring 34 then moves the carriage to the right 10 rotatable contact drum having adjacent con until the follower pin 32 engages the threads 29. ducting and insulating portions joined along The carriage will continue to move at a rate de helical lines, a carriage movable axially of the termined by the threads to close a circuit be drum, a feed screw rotatable with the drum tween the brushes IS and 20 for a predetermined having the same axial pitch as said helical lines, interval as explained above. When the carriage means of the carriage engageable with the feed has moved over against the stop member 31 the screw to move the carriage axially of the drum. follower pin 32 will ride on 'the Cylindrical portion a pair of brushes on the carriage engageable with 23 at the right of the feed member. the drum, a collar threaded on the carriage To reset the mechanism the lever 3| is swung coaxial With the drum carrying one of the clockwise to raise the follower pin 32 above the 20 brushes, the threaded connection between the point where it will engage the threads 29. The collar and carriage having the same axial pitch carriage will then be moved to the left until the as the feed screw and said helical lines, the latch 35 is engaged at which time it is set for collar having a pair of graduated scales at one another operation. end, and a pair of axially spaced index marks In order to prevent accidental Completion of a on the carriage cooperating with said scales circuit between the brushes during resetting, a respectively to indicate the interval during which switch 38 is provided on the carriage in circuit the brushes are electrically connected through with the brushes. The switch 38 is normally the drum. closed but is engaged by the lever 3I when it is 5. Interval control mechanism Comprising a operated to move the follower finger away from 30 contact drum having conducting and insulating the feed member to be opened. Thus, during re portions, a carriage movable axially of the drum, setting it is impossible to establish a circuit a pair of spaced Contacts carried by the carriage through the brushes. engageable with the drum, a feed screw aligned While one embodiment of the invention has with the drum, a follower movably mounted on been shown and described in detail herein, it is 35 the carriage engageable With the feed screw to understood that this is for the purpose of illus move the carriage along the drum, and a switch tration only and is not to be taken as de?nition in circuit with the Contacts engaged and opened of the scope of the invention, reference being by the follower when it is moved out of engage had to the appended claims for this purpose. ment with the feed screw. What is Claimed is: 40 6. Interval control mechanism comprising a 1. Interval control mechanism comprising a) rotatable contact drum having adjacent con ducting and insulating portions joined along helical lines, a carriage movable axially of the contact drum having conducting and insulating portions, a carriage movable axially of the drum, a pair of spaced Contacts carried by the car riage engageable with the drum, a feed screw drum. means to move the carriage at a substan 45 aligned with the drum, a lever pivoted on the tially constant rate, a pair of spaced brushes on carriage and carrying at one end a follower the carriage engageable with the drum, and engageable with the feed screw to move the means mounting one of the brushes on the car carriage along the drum, and a switch on the riage for adjustment about the drum axis along carriage in circuit with the Contacts engaged and helical lines having the same axial pitch as the 50 opened by the lever When it is swung to a posi first named helical lines to vary the helical dis tion to disengage the follower from the feed tance around the drum surface between the screw. brushes. '7. Interval control mechanism comprising a 2. Interval control mechanism comprising a shaft rotatable at a substantlally constant speed, 55 rotatable contact drum having adjacent con a Contact drum on the shaft having Conducting ducting and insulating portions joined along helical lines, a carriage movable axially of the and insulating portions joined by helical lines, a carriage movable longitudinally of the drum, drum, a feed screw rotatable with the drum Contacts on the carriage engaging the drum, a having the same axial pitch as said helical lines, collar threaded on the carriage coaxial with the means on the carriage engageable with the feed 60 drum on threads having the same axial pitch as screw to move the carriage axially of the drum, said helical lines and carrying one of the con a pair of brushes on the carriage engageable with tacts, a feed member on the shaft having cylin the drum, and means mounting one of the drical ends and a helical thread between them brushes on the carriage for adjustment around of the same axial pitch as said helical lines, a the drum in a helical path having the same axial follower pivotally mounted on the carriage pitch as the feed screw and said helical lines. movable into engagement with the feed member, 3. Interval control mechanism Comprisíng a a switch in circuit with the Contacts opened by rotatable contact drum having adjacent conduct the follower when it is moved out of engagement ing and insulating portions joined along helical with the feed member, a latch for holding the lines, a carriage movable axially of the drum, a 70 carriage in one end position, and resillient means feed screw rotatable with the drum having the same axial pitch as said helical lines, means on urging the carriage toward its other end position. - EARLE L. KENT.