US3298244A - Resilient return device for rotatable shafts in electric switching equipment and the like - Google Patents

Resilient return device for rotatable shafts in electric switching equipment and the like Download PDF

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Publication number
US3298244A
US3298244A US418500A US41850064A US3298244A US 3298244 A US3298244 A US 3298244A US 418500 A US418500 A US 418500A US 41850064 A US41850064 A US 41850064A US 3298244 A US3298244 A US 3298244A
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United States
Prior art keywords
shaft
frame
plate
rotation
spring
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Expired - Lifetime
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US418500A
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English (en)
Inventor
Roger C Durand
Fosse Jean G La
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Telemecanique SA
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La Telemecanique Electrique SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/36—Driving mechanisms
    • H01H21/50—Driving mechanisms with indexing or latching means, e.g. indexing by ball and spring; with means to ensure stopping at intermediate operative positions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20474—Rotatable rod, shaft, or post
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents

Definitions

  • This invention relates to an improved spring device for resiliently restraining a rotatable shaft in a prescribed neutral position and returning the shaft to that position when rotated in either direction away from the neutral position.
  • the device is especially useful in connection with electrical switching equipment such as multi-positional rotary controllers, and will be described with especial reference to this last application.
  • a known type of multi-positional controller for manually controlling complex electrical apparatus comprises a camming drum mounted on a shaft for rotation by means of a manual lever or handle.
  • the drum has a plurality of camming projections spaced axially and/or circumferentially of its periphery, the projections being desirably arranged to be selectively presettable at prescribed positions on the drum.
  • a set of microswitches, connected in the circuitry of the electrical apparatus to be controlled, is arranged adjacent the drum, e.g. in a linear array parallel to a generatrix of the drum, so as to be actuated during rotation of the drum on engagement of a camming projection of the drum with an actuator element of a microswitch.
  • a rotary controller there is one angular position of the drum which is a neutral position wherein, for example, all of the microswit-chcs may be deactivated and the associated apparatus deenergized.
  • Resilient means are generally provided for restraining the drum in this neutral position and returning it thereto on release of the control lever after the lever has been displaced in one or the other direction away from the neutral position.
  • a pre-tensioned helical torsion spring coaxial with the shaft and having outturned end legs engaging stop means on the stationary frame structure, and the shaft has a driver pin projecting from it and interposed between the legs of the springs so as to deform the spring in torsion when the shaft is displaced in either direction away from neutral.
  • Objects of this invention include the provision of a resilent return device of the type specified in which the spring restoring couple can be made approximately uniform over a wide range of angular displacements; in which the shaft will be restored to neutral under a controlled, and if desired substantially uniform, velocity without tendency to overshoot or rebound; intermediate detent positions, if any are provided, will be positively and reliably traversed; and to provide such a device which will be simple and sturdy and inexpensive and especially well-suited for use in multi-positional rotary controllers and analogous switching equipment.
  • FIGURE 1 is a side view of an electrical controller apparatus embodying the invention.
  • FIGURE 2 is a corresponding view in overhead plan.
  • FIGURE 3a is an end view as viewed in IIIIII, FIGURE 1, showing the resilient return device of the invention in neutral position.
  • FIGURES 3b and 3c are similar views showing the device in its two end positions respectively.
  • FIGURE 4 is an exploded view of the device.
  • the rotary cont-roller switch assembly generally illustrated in FIGURES 1 and 2 comprises a supporting frame in the form of a pair of end plates 4 and 5 and four spacer rods or posts 3 having ends engaging suitable holes formed in the corners of the end plates and retained in assembly therewith by means of screw 12.
  • a shaft is arranged for rotation in coaxial openings formed in the end plates 4 and 5 :and is formed with an extension 2 beyond end plate 4 in the form of a manual lever crank or handle for rotating the shaft.
  • a controller drum mounted on the shaft between end plates 4, 5 is a controller drum generally designated T and formed in this embodiment of the invention as a stack of identical spool-like elements 1 all assembled in juxtaposed relation along the shaft 19 for bodily rotation with said shaft when the handle 2 is turned one way or the other.
  • the spoollike elements 1 are desirably made of a tough plastic material and each element comprises a cylindrical body and a pair of disk-like side flanges coaxial with the body and of larger diameter than it, as will be apparent from FIGURE 1.
  • the inwardly directed surface of each of the side flanges of each spool-like element ll has a series of oval bosses 6 projecting from it towards the other side flange.
  • Cylindrical camming pins 7 are adapted to be selectively inserted between pairs of adjacent bosses 6 so as to be removably retained between said bosses and the cylindrical surface of the body of the spool.
  • microswitc'hes 8 An array of identical microswitc'hes 8 is supported from the end frame members 4, 5 of the assembly as by way of the flanged strips shown.
  • Each microswitch 8 of generally conventional construction, has an actuator element 8:: projecting from it.
  • the actuator elements 8a of all the microswitches are aligned substantially parallel to a common generatrix of the drum T so as to be selectively depressible by the pins '7 of the respective drum elements 1, by way of intermediate levers or the like partly shown at 8b, when the drum T is rotated with handle 2.
  • FIGURES 1 and 2 the controller switch assembly is illustrated in a neutral position, in which a pointer 2a associated with handle 2 is positioned in registry with a zero calibration of a suitable dial 9 associated with the assembly, this being the lowermost position of pointer 2a in the drawings. From this neutral position the handle 2 can be turned in either direction.
  • the microswitches 8 are connected with the circuitry, not shown, of electrical apparatus to be controlled by means of the controller switch assembly.
  • the camming pins 7 are preset at selected positions on the respective spool-like drum elements 1, in accordance with a prescribed programme. Actuation of the handle 2 will then serve to operate the electrical apparatus in accordance with the programmed sequence and with current operational requirements.
  • the controller switch assembly so far described is generally conventional and does not, per se, form a part of this invention. Improved means will now be described in accordance with the invention for resiliently returning the rotatable assembly, including the drum T, the shaft and handle, which spring return means is generally designated 119, to its neutral position when displaced therefrom in either sense by means of the handle 2.
  • the spring return means 119 is mounted on the outer side of the end frame plate remote from the handle 2, and its component parts are best seen in the exploded view of FIGURE 4.
  • This assembly includes a flanged supporting frame plate or stirrup 11 having a central aperture, diametrically-opposed side legs 23 turned down at right angles to the plane of the plate 11, and outturned apertured securing lugs 11a.
  • the lugs 11a are secured to the end plate 5 of the assembly frame by means of the screws 12 engaging threaded holes formed in the adjacent ends of the spacer bars 3, and thus contribute to holding the entire structure in assembly.
  • the rotatable shaft carrying the drum T has an end fitting secured on its projecting end beyond the end plate, said fitting being shown at the extreme right in FIGURE 4.
  • This end fitting includes a flange 19b seated against the outer surface of end plate 5, a cylindrical hub 19 having a pair of square driver pins or lugs 20 projecting from diametrically opposed points of it, and a smaller diameter end hub or nose 1%.
  • a generally octogonal plate 13B is centrally recessed to fit around the hub portion 19 of the shaft.
  • the recess in plate 13b includes as shown a pair of diametrically opposed arcs 14 forming part of a common circumference and each somewhat less than 90 in extent, and a pair of larger-radius sector-shaped cutout portions 15 interconnecting said arcs.
  • the dimensioning of the various portions of the recess is such that the plate can be fitted around the hub 19, with the two opposite, smaller-radius arcs 14 of the recess rotatably engaging the cylindrical surface of said hub, and the driver pins projecting from said hub then riding in the sector cutouts 15 of the recess so as to limit the rotation of the plate 13B relative to the shaft through abutment of the pins 20' with radial sidewalls of the sector cutouts.
  • the plates 13a and 131) each have a pair of opposite lugs 17 projecting from their opposite ends and bent at right angles to the plate.
  • a pair of extension coil springs 18 have their hooked ends anchored to lugs 17 of the respective plates, each spring having its one end hooked around a lug 17 projecting from plate 13A and its other end hooked around a lug projecting from plate 13B.
  • Each of the plates 13A and 1313 has edge portions 21 which are inclined at an angle of substantially 45 to the 4 main axis of the plate as defined by a line joining the spring-anchoring lugs 17 thereof.
  • each spring tends to rotate both plates 13A, 1313 in opposite directions until the rotation of both plates is arrested through abutment of inclined edges 21 of the plates with a common inner surface of a related one of the two downturned flanges 23 of the frame cover plate 21. Due to the above defined angular relationship of said edges 21, it will be apparent that in this abutted position the two plates 13A and 13B are arrested in a mutually orthogonal relationship, in which corresponding radial directions of the respective plates are at right angles to each other, as shown in FIGURE 3a.
  • each sector cutout portion 15 of the recess in each plate 13A, 13B is somewhat greater than in arcuate extent. More precisely, the arcuate extent of each sector portion 15 may be made substantially equal to 90 plus the width of a driver lug 20. Hence in the mutually orthogonal abutted position of the two plates 13A, 13B just described, each sector cutout 15 of one plate overlaps a related sector cutout 15 of the other plate an amount corresponding to the width of a driver lug 20, with the overlapping portions of the two pairs of sector cutouts 15 being diametrically opposed.
  • the extension springs 18 exert a restoring couple tending to return the assembly 19 to neutral, and the value of the restoring couple can be seen to be twice the product of the tension of a spring 18 times the distance (designated A in FIGURE 3a of the centre of rotation of the assembly from the centre line of action of either spring 18.
  • plate 13B remains in its abutted position because, firstly, driver lugs 20 are moving freely within the sector cutouts 15 of said plate 13B without acting on the radial sides thereof, and, secondly, rotation of plate 13B in the direction F1 is positively prevented through the abutment of the inclined edges 21 of the plate against the stationary flange surfaces 23.
  • the restoring couple remains approximately constant as the angle of rotation is increased from zero, over a substantial angular range to either side of the neutral position.
  • the spring restoring couple which opposes displacement of the rotatable assembly by means of handle 2 to either side from neutral, is substantially proportional to a cosine function of the displacement angle.
  • the couple remains constant, to a second order of approximation, for small displacement angles and thereafter falls off toward zero as the displacement angle approaches 90.
  • the lever has been turned by about 90 from its neutral position, as to either of the positions shown in FIGURES 3b and 3c, the distance termed A in FIGURE 3a would approach zero.
  • the restoring force would tend to drop to unacceptably low values for large rotation angles.
  • the nose fixture of the shaft includes a projecting cylindrical section 1% beyond the hub portion 19, so that the extension springs 18 are forced into contact with the peripheral surface of the projecting section 19a when the angular displacement of the assembly exceeds a predeterminable amount, whereupon the springs are deflected as shown in FIGURES 3b and 3c and the distance previously referred as A is positively prevented from approaching zero but is made to retain the constant value determined by the radius R of the projecting section 19a. It can be shown that with this arrangement, the restoring couple of the springs actually increases somewhat as the rotation is continued beyond the angle at which the springs 18 first contact the periphery of cylindrical portion 19a.
  • the rotatable assembly including the drum T and the plate 13A or 13B that was displaced therewith, returns to its neutral position under the approximately constant force exerted by the spring arrangement described. Due to this constant restoring force, and also to the frictional resistance developed between the particular plate ]l3A or 138 which is moving, with the washer 16 on one side and with the outer surface of flange 1% or the inner surface of frame plate 11, as the case may be, on the other side, the rotatable assembly is returned to neutral position at a moderate and substantially uniform velocity and so has no tendency to overshoot the neutral position or rebound therefrom.
  • detent means are prvoided for resiliently arresting or retarding the rotation of the drum T at each of a number of prescribed angular positions in order to make the operator aware that such a position has been reached in the manipulation of handle 2.
  • detent means are generally designated 24 in FIGURE 1 and include levers supported from the upper spacer posts 3 and resiliently cooperating with the previously mentioned camming rods 7 inserted around the periphery of the drum T.
  • the detent means 6 form the subject matter of co-pending patent application Serial No. 418,400, now Patent No. 3,242,762, for Detent Device for a Rotatable Member in Electrical Switching Equipment and the Like and hence need not be here described in greater detail.
  • the invention has provided a highly advantageous two-way spring-restoring arrangement for a shaft rotatable in opposite directions from a neutral position, especially for use in a rotary switching device such as a multipositional rotary controller for electrical equipment.
  • the arrangement has made it possible to achieve a substantially uniform spring-restoring couple over the full extent of the angular displacement of the shaft in either direction, whereby said uniform couple can be predetermined at an optimum value such that it will reliably ensure a positive return of the rotatable assembly at a moderate velocity without overshoot or rebound and will cause said assembly to move past any detent means (such as the means 24) if such are provided without imposing an excessive muscular effort on the operator at any point over the range of the angular displacement.
  • the improved device may be found useful in various contexts, including cases Where the rotatable shaft to be resiliently restrained is rotated mechanically (e.g. in limit switches) rather than manually as herein shown.
  • the various cooperating components of the device including especially the driver pins 20, plates 13A and 13B, and frame lugs 23, as well as the springs 13, may be designed in a variety of forms other than those shown and described above in detail.
  • the desired two-way restoring effect is obtained through the provision of the following entities: a first and a second elements mounted for indepenent rotation around the shaft (i.e.
  • first and second plates 13A, 13B first cooperating stop means on the first element and the shaft engagea-ble to limit rotation of the first element relative to the shaft in a first direction (i.e., one radial sidewall of each cutout 15 of plate 13A and a related side of each lug 20); second cooperating stop means on the second element and the shaft engageable to limit rotation of the second element relative to the shaft in the opposite direction (i.e., the opposite radial sidewall of each cutout 15 of plate 13B .and a related opposite side of each lug 20); third cooperating stop means on the first element and the frame engageable to limit rotation of the first element relative to the frame in said first direction (i.e., an edge 21 of plate 13A engageable with the inner surface of a leg 23); fourth cooperating stop means on the second element and the frame engageable to limit rotation of the second element relative to the frame in said opposite direction (i.e., an edge 21 of plate 13B engageable with the inner surface of a leg 23); and spring means 18 inter
  • a resilient return device for a switching shaft rotatable in opposite directions from a neutral position relative to a shaftsupporting frame comprising:
  • first cooperating stop means on the first element and the shaft engageable to limit rotation of the first element relative to the shaft in a first direction
  • spring means interconnecting both elements so as to tend to rotate the first element in said first direction and rotate the second element in said second direction; whereby said elements will resiliently restrain said shaft in, and return the shaft to a prescribed neutral position relative to the frame.
  • said spring means comprises an extension spring having opposite ends attached to the respective elements, said spring having its line of action lying substantially in a plane transverse to the geometric axis of said shaft at a radial distance therefrom.
  • the invention claimed in claim 2 including means defining a cylindrical surface coaxial with the shaft and of a radius less than the value of said radial distance when the shaft is in neutral position, and engageable by said extension spring during shaft rotation away from said neutral position to deflect the spring and prevent the line of action thereof from approaching the shaft axis to within less than a predetermined minimal radial distance.
  • a resilient return device for a switching shaft rotatable in opposite directions from a neutral position relative to a shaftsupporting frame comprising:
  • a first plate mounted for rotation around the shaft and having a cutout therein with a radial wall of said cutout engageable with one side of said pin to limit the rotation of said first plate relative to the shaft in a first direction;
  • a second plate mounted for rotation around the shaft and having a cutout therein with a radial wall of said cutout engageable with the opposite side of said pin to limit the rotation of said second plate relative to the shaft in the opposite direction;
  • a stop surface on the first plate engageable with a cooperating stop surface on the frame to limit rotation of the first plate relative to the frame in said one direction;
  • spring means connected to both plates to tend to rotate the first plate in said first direction and rotate the second plate in said opposite direction;
  • said spring means comprises an extension spring having opposite ends attached to the respective plates, said spring having its line of action substantially in a plane transverse to the geometric axis of said shaft at a radial distance therefrom.
  • the invention claimed in claim 5, including means defining a cylindrical surface coaxial with the shaft and of a radius less than the value of said radial distance when the shaft is in neutral position and engageable by said extension spring during shaft rotation away from said neutral position to deflect the spring and prevent its line of action from approaching the shaft axis to within less than a predetermined minimal radial distance.
  • a resilient return device for a switching shaft rotatable in opposite directions from a neutral position relative to a shaftsupporting frame comprising:
  • a first plate mounted for rotation around the shaft and having two diametrically opposed cutouts therein With a radial wall of each cutout engageable with one side of a related one of said pins to jointly limit the rotation of said first plate relative to the shaft in a first direction;
  • a second plate mounted for rotation around the shaft and having two diametrically opposed cutouts therein with a radial wall of each cutout engageable with the opposite side of a related one of said pins to jointly limit the rotation of said second plate relative to the shaft in the opposite direction;
  • stop surface means on each of said first and second plates engageable with cooperating stop surface means on the frame to limit rotation of said first and second plates relative to the frame respectively in said first and said opposite directions;
  • stop surface means on each of said plates comprises edge surfaces of the respective plates inclined at opposite angles from the line of symmetry of the pair of cutouts formed in the respective plates, and said cooperating stop means comprises a common planar surface projecting from the frame.
  • said frame includes a supporting surface transverse to the shaft and having an aperture therein through which the shaft projects, and including a flanged stirrup-like frame member having a portion transverse to the shaft axially spaced from said supporting surface and two diametrically opposed fianged leg portions secured to said supporting surface, each of said leg portions defining said common planar surface on its inwardly directed side, and said plates are rotatably supported on said shaft in axially adjacent relation and are retained between said supporting surface and said transverse portion of the frame member, each plate having two opposite parallel edge surfaces to define said stop surface means cooperating with the respective planar surfaces defined on the inwardly directed side of a respective leg portion.
  • the invention claimed in claim 10 including hub structure on the shaft in the part thereof projecting through said aperture, said hulb structure including a first cylindrical bearing surface for rotatably receiving said plates thereon and having said pins projecting there- 9 10 from and a second cylindrical surface coaxially extend- 12.

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  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Mechanical Control Devices (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Gear-Shifting Mechanisms (AREA)
US418500A 1963-12-23 1964-12-15 Resilient return device for rotatable shafts in electric switching equipment and the like Expired - Lifetime US3298244A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR958233A FR1404430A (fr) 1963-12-23 1963-12-23 Dispositifs de rappel élastique et d'asservissement pour appareils tournants électrques, en particulier commutateurs

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US3298244A true US3298244A (en) 1967-01-17

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US418500A Expired - Lifetime US3298244A (en) 1963-12-23 1964-12-15 Resilient return device for rotatable shafts in electric switching equipment and the like
US418400A Expired - Lifetime US3242762A (en) 1963-12-23 1964-12-15 Detent device for a rotatable member in electrical switching equipment and the like

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Application Number Title Priority Date Filing Date
US418400A Expired - Lifetime US3242762A (en) 1963-12-23 1964-12-15 Detent device for a rotatable member in electrical switching equipment and the like

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AT (1) AT258388B (enrdf_load_html_response)
BE (1) BE657487A (enrdf_load_html_response)
BR (1) BR6465546D0 (enrdf_load_html_response)
CH (1) CH419284A (enrdf_load_html_response)
DE (2) DE1226686B (enrdf_load_html_response)
DK (1) DK127203B (enrdf_load_html_response)
ES (1) ES307422A1 (enrdf_load_html_response)
FR (1) FR1404430A (enrdf_load_html_response)
GB (1) GB1084037A (enrdf_load_html_response)
NL (1) NL6415039A (enrdf_load_html_response)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519777A (en) * 1966-12-12 1970-07-07 Gemco Electric Co Dual positioning mechanism for a rotary electric switch with a lostmotion coupling between rotors and particular detent means

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743799A (en) * 1972-02-08 1973-07-03 Gemco Electric Co Selector switch mechanism with adjustable radial cam insert members having circumferential overlap flange
US3943308A (en) * 1973-08-18 1976-03-09 Becker Flugfunwerk Gmbh Control for navigation receivers, radio compasses, radio, and aircraft telephony, transponders and the like
US4381437A (en) 1981-01-08 1983-04-26 Tri-Tech, Inc. Switching device
US4684905A (en) * 1983-12-14 1987-08-04 Weinschel Engineering Load-bearing detent mechanism

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642502A (en) * 1951-12-17 1953-06-16 Arrow Hart & Hegeman Electric Rotary selector switch with bias
US2954707A (en) * 1958-02-17 1960-10-04 Collins Radio Co Bidirectional spring-loaded, control device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123733B (de) * 1960-05-10 1962-02-15 Siemens Ag Rueckstellfederelement fuer Drehschalter, insbesondere nockenbetaetigte Steuerschalter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642502A (en) * 1951-12-17 1953-06-16 Arrow Hart & Hegeman Electric Rotary selector switch with bias
US2954707A (en) * 1958-02-17 1960-10-04 Collins Radio Co Bidirectional spring-loaded, control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519777A (en) * 1966-12-12 1970-07-07 Gemco Electric Co Dual positioning mechanism for a rotary electric switch with a lostmotion coupling between rotors and particular detent means

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AT258388B (de) 1967-11-27
GB1084037A (enrdf_load_html_response) 1967-09-20
SE308548B (enrdf_load_html_response) 1969-02-17
FR1404430A (fr) 1965-07-02
BR6465546D0 (pt) 1973-12-26
DE1226686B (de) 1966-10-13
SE307186B (enrdf_load_html_response) 1968-12-23
DE1265819B (de) 1968-04-11
CH419284A (fr) 1966-08-31
US3242762A (en) 1966-03-29
DK127203B (da) 1973-10-01
ES307422A1 (es) 1965-04-16
NL6415039A (enrdf_load_html_response) 1965-06-24
BE657487A (enrdf_load_html_response) 1965-06-22

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