Патент USA US2405060код для вставки
July 30,1946. P. ?F. SCOFHELD STARTER TEST STAND " 2,4053% ? ' Filed June 29, 1944" " _ -? > 4 Sheets-Sheet 1 ZNVENTOR. BY ? A TTGENE v July 30, 1946- P. F. SCGFEELD _ ? I 2A�� STARTER TEST STAND Filed June 29, 1944 4 Sheets-Sheet 2 INVENTOR. By PHILIP F ScoF/sw. A TTORNE Y July 30, 1946. 2,405,06@ P. F. SCOFIELD STARTER TEST STAND Filed June ?29, 1944 4 Sheets-Sheet 3 JNVEN TOR. PH/MP F Scan/s1 0. ATTORNEY Julylw, 1946a - P. F. SCOFIELD 2,405,060 STARTER TEST STAND Filed June 29, 1944, 4. 4 Sheets-Sheet 4 _ 3a INVENTOR. BY PH/L/P F ScoFlELo. \\ ? "MM ATTORNEY Patented July 30, 1946 2,405,060 UNITED STATES PATENT OFFICE 2,405,060 STARTER TEST STAND Philip F. Sco?eld, Cleveland Heights, Ghio, as signor, by mesne assignments, to Jack & Heintz Precision Industries, Inc., Cleveland, Ohio, a corporation of Delaware Application June 29, 1944, ?Serial?No. 542,700 4 Claims. (Cl. 73-418) 2 This invention relates to a portable test stand for testing aircraft starters and the like. The general object of the invention is to provide a compact and rugged portable dynarnometer test stand for testing aircraft starters, ener gizers and the like which is adapted for use in the ?eld to give reliable results with speed and The mounting plate 3 itself carries a plurality of become connection apparent with the as the accompanying description drawings proceeds il lustrating a preferred embodiment of the inven surface l2 with a heel portion [3 on the arm. The cam surface 52 is formed from a vertical dowels 5 and 6' on opposite sides thereof ar ranged to enter holes in the starter mounting ?ange to prevent rotation of the starter on the mounting plate, the dowels t being arranged to ?t a different sized starter ?ange than the dowels 5?. Thus the plate 3 may be turned over to pre facility. sent the dowels 6? outwardly, the dowels 6 being A particular object of the invention is to pro then disposed within the head 2. Openings may vide an absorption brake torque testing device 10 be provided in the plate 3 for observation of the which is particularly adapted for use with inertia starter jaw in operation. A pair of clamping arms 1 are provided to hold the starter clamped tightly type aircraft starters. against the mounting plate. A further object is to provide an aircraft starter testing unit designed to readily accommodate both Referring now to Figures 4 and 5, each of left and right hand rotating starters of different 15 the clamping arms ?I is loosely pivoted by means sizes which will indicate the rotational speed and of a slot 8 to a vertical pin 9 on a side portion torque developed in a simulated starting opera~ of the head 2. A spring operated ball detent It) is contained in the rear end of each arm ?I in a tion. A still further object is to provide a test stand position to bear against an upstanding post or of the type described having novel quick acting ' screw head I! on the head 2 to resiliently urge self-positioning clamping means to removably the arm ?i into clamping position as shown in hold a starter rigidly thereon. Figure 4. Clamping engagement of each arm 1 These and other objects and advantages will is positively maintained by engagement of a cam shaft portion M ,iournaled in the head 2 adjacent the pin 9, said shaft having a lever arm or handle Figure 1 is a front elevational view of the test I5 on its upper end. It will be seen from Figure 4 that when the lever arms l5 are swung for~ stand; Figure 2 is a side elevational view with parts 30 wardly the cam surface l2 shown in section will be rotated in a counterclockwise direction to en shown in section; Figure 3 is a view in rear elevation of the ab gage the heel portion [3 and move the clamping sorption brake structure and torque arms, the arm ?I rearwardly on the pin 9. The forward end of the clamping arm l carries an adjustable flange driving shaft not being shown; Figure 4 is an enlarged fragmentary view partly engaging screw it which may be locked by a set in top elevation and partly in section showing screw I? in the proper position to ?rmly engage the starter clamping mechanism in clamped posi a mounting flange 25 of a particular thickness on a starter 2i. The slope of the cam surface [2 tion; and Figure 5 is a view similar to Figure 4 showing is a very gradual one so that the above described the starter clamping arms released from the ? clamping action will maintain itself by frictional force when the parts are brought to the position starter. shown in Figure 4. The device comprises generally a combined base and frame I, best shown in Figures 1 and 2, To unclamp a starter it is merely necessary to having means to clamp a starter thereon in driv rotate the handles it outwardly and rearwardly so ing engagement with a rotatable shaft, and brake as to rotate the shaft Iii having the cam shown in mechanism, best shown in Figure 3, for absorbing section in a clockwise direction. This rotation the energy of said shaft and responding to the withdraws each cam surface it?. from the heel. 13, torque thereof. allowing the detents is to move the arms 'i longi Cast integrally with the base I is a cylindrical tudinaily forwardly, and brings a back cam sur head 2 carrying a reversible mounting plate 3 - face 22 to engage a toe portion 23 on each arm which accommodates starters with different sized ?i to swing the arm outwardly to the open posi mounting ?anges. The mounting plate 3 is re tion shown in Figure 5. In the open position movably carried in an annular recess 4 in the head the resilient force exerted by the ball detents it? 2 in the manner shown in Figure 2, rotation be causes both clamping arms 7 to bear against the tion in which: . ing prevented by a large dowel 5 on the head 2. cam surfaces. Then when the handles l5 are ro 2,405,060 4 tated forwardly to clamp a starter each toe por tion 23? will follow the cam surface inwardly until the arms 1 are parallel with the starter, and overlying its mounting ?ange in position to be moved longitudinally rearwardly upon further rotation of the shafts M in the manner described above to exert a positive clamping action. The clamping arms 1 may be described as quick acting and self positioning in view of their com the brake tensioning hand wheel 46 ride free on the shaft 21 and are positioned solely by the con nection of the arm 41 with the torque indicator which is in turn anchored to the base abutment The torque indicator 57 being constructed for receiving the application of force in compression will be connected with the arm 4! and the abut ment 55 on the right side of the device when the rotation of shaft El is clockwise as viewed in Fig pound pivotal and longitudinal movements in 10 ure 1, and will be connected with the arm 48 and clamping and releasing a starter mounting abutment 55 on the left side of the device for coun terclockwise rotation. Force measuring indica ?ange by individual cam actuation as above de tors operable in tension rather than compression scribed. These arms are designed to satisfac may be employed by merely connecting the in torily clamp the various diameters of ?anges ac commodated by the two sides of mounting plate 3. 15 dicator to the proper brake arm to utilize a ten sion rather than a compressive force. The head 2 is of general cylindrical shape to receive therewithin a pair of bearing assemblies The numeral 69 indicates a tachometer con 25 and 26 mounting a rotatable shaft 21. The nected through a ?exible cable ill with a gear 02 shaft 21 is hollow and carries in its forward end driven by the previously mentioned gear 3] on a splined jaw clutch member 28, removably se 20 the shaft 2'5. Duplicate ?ttings 63 and 615 enable cured by a screw 29, in position to be engaged the connection of the tachometer on either side by a jaw member 3i} on the starter. The shaft of the base, so to be adjacent the torque meter. 21 also carries a gear 3| for a tachometer drive, The dial of the tachometer is preferably arranged to be referred to later. for indicating speeds in either direction, the di Referring now to Figure 2 the shaft 27 carries 25 rection of movement of the indicator from a cen at its rear end a brake drum 3% rigidly attached tral zero position automatically indicating the thereto by means of a ?ange and hub construc direction of rotation, tion 35. On the shaft 2? between the head 2 and The device is preferably mounted on and se the ?ange and hub construction 36 is a ?oating curely bolted to a heavy bench or other suitable bearing 31 carrying a brake assembly plate 38. foundation of suf?cient rigidity to prevent over The brake plate 33 carries a pair of brake shoes turning under locked brake test conditions. By 39 arranged in braking relation with the drum tightening the brake setting sufficiently the pres 35 and is externally provided with a pair of op ent device is adapted to be used for a locked rotor positely extending torque arms till and 4 l. Coarse test simulatin;r the conditions encountered in at adjustment of the brake shoes may be effected 35 tempting to crank a frozen engine, as well as nor by a conventional wedge adjusting mechanism 42 ma1 operating tests with the brakes set to simulate having a square ended adjusting screw 43 acces the load. imposed upon the starter in a normal sible on the forward side of the brake plate 33. cranking operation. The brake shoes 39 are brought to bear against Thus the present device operates on the general the drum 35 through the action of a lever 46 principle of a prony brake dynamometer, but the operable by a ?exible brake cable 65 as shown in re?nements of its novel construction adapt it Figure 3. The brake cable ?35 is tensioned by a particularly to the rapid testing of aircraft hand wheel. 6&3 on a screw threaded member starters in the ?eld. t is portable and rugged operating in. a supporting sleeve ill on the plate 38 and will give reliable results in the hands of rela 45 as shown in Figure l. The sleeve ii?! is prefer tively unskilled operators. The reversible mount~ ably provided with a scale 138 which is uncovered ing plate and interchangeable jaw members, to by the axial movement of an end 49 on a sur gether with the twin torque arms, render the rounding sleeve iii?: integral with the hand wheel device adaptable to starters having different size Mi whereby markings on the scale may be ob served to roughly duplicate former brake settings 50 base flanges, di?erent jaw members, and having either right or left hand rotation. Change overs and torque loads. These calibrations indicate from one type of starter to another are readily hand wheel turns and experience will enable the effected without dismantling, and without affect operator to approximate in advance the desired ll?lg the quick acting, self-positioning clamping torque load by the preliminary setting of the hand wheel. Fine brake adjustment necessitated by 55 means. Also, by suitably modifying the mounting plate and removable jaw member 28, the pres brake shoe wear, cable stretch, heat of the brake ent device may be employed for torque and dy drum, etc, may be made conveniently with an namometer tests on other specialized apparatus, ordinary wrench on an adjusting nut 5! on the or for general application. hand wheel hub. Various changes may be madein the construc Opposite sides of the lower part of the base I 60 tion and arrangement of parts and all such mod are provided with rigid abutments 55 and 55 di rectly beneath the arms 49 and ill for connection with a torque indicator 5?. As shown in Figure 1 i?cations are included in the invention, the same being limited only by the scope of the appended claims. I claim: 1. A starter test stand comprising a base, a shaft in said base arranged for driving engagement by arm iii through a similar pin connector 59, the end of the torque arm being preferably bifurcated said starter, a brake drum rigidly mounted on in the same manner as abutment 56 to carry the said shaft, a brake shoe plate associated with said pin 59. The torque indicator 5? is a force meas 70 brake drum, a brake cable for actuating said uring instrument stressed in compression by the brake shoes, a hand wheel on said brake shoe downward force exerted by the arm ill and may plate for tensioning said cable, a graduated scale be calibrated in units of torque. associated with said hand wheel to facilitate the The brake plate 38 carrying the above-described setting of predetermined brake loadings, and ad brake assembly, the torque arms til and M and 75 justing means associated with said hand wheel to the torque indicator 5? makes pivotal connection with the base abutment 56 through a bearing pin 58 and makes pivotal connection with the torque 2,405,060 6 compensate for brake wear and the like without ing position, and rotatable in a reverse direction disturbing hand wheel settings on said scale. to release said clamping action and swing said 2. In a starter test stand, a housing adapted to arms outwardly to disengage said base ?ange. position a starter for driving engagement with a 4. In a starter test stand, a base housing carry rotatable shaft, a pair of clamping arms pivoted 5 ing a rotatable shaft adapted to receive inter on said housing for rotational and longitudinal changeable jaw members for engagement by dif movements, individual cam means in said hous ferent starters, a reversible mounting plate on said ing for moving said arms longitudinally to estab base having opposite faces adapted to match dif lish and maintain a ?rm clamping engagement ferent starter mounting ?anges to position a with a starter base ?ange and to swing said arms 10 starter in driving engagement with a jaw member outwardly to release said base ?ange. on said shaft, a pair of quick release clamping 3. In a starter test stand, a housing adapted to arms pivoted on said base, and means on said position a starter for driving engagement with a arms to adjust for starter ?ange thickness in or? rotatable shaft, a pair of clamping arms pivoted der to clamp a starter securely to said mounting on said housing for rotational and longitudinal 15 plate in position for said engagement as said movements, resilient means for swinging said clamping arms overlap� said mounting plate to en arms inwardly to grasp a starter base ?ange, cam gage said mounting ?ange. means rotatable in one direction to move said arms longitudinally from a grasping to a clamp PHILIP F. SCOFIELD.