US2707041A - Automatic shaft positioning apparatus - Google Patents

Automatic shaft positioning apparatus Download PDF

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Publication number
US2707041A
US2707041A US77424A US7742449A US2707041A US 2707041 A US2707041 A US 2707041A US 77424 A US77424 A US 77424A US 7742449 A US7742449 A US 7742449A US 2707041 A US2707041 A US 2707041A
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US
United States
Prior art keywords
pawl
selector
shaft
locking
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US77424A
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English (en)
Inventor
Eric E Jones
Vervest Wilhelmus Lambertus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2707041A publication Critical patent/US2707041A/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • G05D3/125—Control of position or direction using feedback using discrete position sensor
    • G05D3/127—Control of position or direction using feedback using discrete position sensor with electrical contact
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/14—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings operated by auxiliary power
    • H03J5/20—Settings determined by a number of positioning means actuated by a second means adjustable to different positions by the same or by a second auxiliary power

Definitions

  • This invention relates to a shaft-positioning device, and more particularly to a shaft-positioning device which includes a pawl knob.
  • a pawl knob is a system of associated locking discs and pawls which positions, for example, the shaft serving to control the capacity of a condenser in a transmitter or a receiver for wireless intelligence or to adjust other tuning members.
  • control-members may be readily moved from one position to another.
  • apparatus comprising pawl knobs are adapted to be operated by remote control.
  • the pawl knob For each position of the shaft required to be selected the pawl knob comprises a locking disc and an associated pawl.
  • a movable selecting member which is referred to as a pawl selector, permits any selected pawl to be caused to co-operate with the locking disc with which it is associated.
  • a number of such pawl knobs, each of which operates on a separate shaft may be assembled to form a mechanism in which the shafts are adapted to be operated by a common driving arrangement either by hand or with the use of a motor.
  • a device in which the pawl selector of a pawl knob is displaced by the same operating device knob shaft is rotated during the second step until it is locked by the operative pawl upon reaching the selected position.
  • the present device was constructed so that the direction of rotation of the driving shaft had to be reversed with the use of a control-knob. The attention of the operator was required to perform this operation at the correct time.
  • Each stationary contact member is associated with a definite pawl.
  • the contact arm of this position switch is moved simultaneously with the pawl selector, so that each position
  • This current may, for example, serve as the controlcurrent of a relay, the switch of which reverses the field current of a motor which actuates the driving shaft.
  • This device has also a limitation. As soon as the contact arm has contacted the selected contact member, it stops moving. If the contact arm moves excessively slowly, the contact surface between the contact arm and the stationary contact member will be small so that the contact is unreliable. It will readily be interrupted due to vibration or to impurities (burning). This phenomenon occurs particularly if the movement of the drivretardation, as is generally the case of electric driving. If, on the contrary, the pawl selector and the contact arm move with excessive speed, the contact arm may pass over the selected contact member before the closing current has any effect. Consequently, this device requires a quite defined ratio between transmission of the movements from the driving shaft to the pawl selector and the contact arm.
  • the invention relates more pawl knobs and a common driving arrangement for the pawl selector and the shaft of are not inherent.
  • the separating device of the pawl selector and the pawl selector itself have arranged between them a locking element.
  • the locking element may be formed by a pawl wheel and a pawl co-operating therewith and The pawl wheel of the plawl selector.
  • the device according to t e separating device being, for example, a simple ratchetgear coupling (a one-way coupling) similar to the above known devices.
  • pawl knobs may be assumed to be and an operative .by like reference Corresponding parts are designated in Figs. 1 and 2 numerals.
  • the two devices shown each comprise a motor 1 which serves to drive the pawl selector as well as the shaft of the pawl knob. They are differentiated in that in the device shown in Fig. 2 the motor is automatically stopped when upon changing their positions all the pawl knobs occupy their new positions, and in the device shown in Fig. 1 the switch of the motor is operated manually.
  • motor 1 drives a gear wheel 2, which meshes with two further gear wheels 3 and 4.
  • gear wheel 3 Actuated through gear wheel 3 is a shaft 5 on which are seated pawl selectors 6, 7 and 8, the movement being transmitted from gear wheel 3 to the shaft 5 through a shaft 9, a separating device 10 and a set of bevel gears 11.
  • gear wheel 4 Driven through gear wheel 4 is a shaft 12, the movement of which is transmitted with the use of a set of bevel gears 13, 14 and 15 to shafts 16, 17 and 18 respectively.
  • a system of locking discs is clamped to the shaft of each pawl knob.
  • Each system comprises the same number of discs, for example eight pieces.
  • the drawing shows a single locking disc (19, 20, 21) for each pawl knob and a single rotatable pawl (22, 23, 24) for each pawl knob, but in actual fact each locking disc is associated with such a pawl.
  • the shafts of the pawl knob and the pawl selector may be in line with one another and in this case the arm of the pawl may be secured to a rotatable shaft which also supports the pawl and is arranged parallel to the pawl knob shaft, the arms of all the pawls being in one plane at right angles to the shaft and the pawls themselves being located in different planes, the shafts of the pawls forming the edges of an equilateral prism.
  • a pawl selector On the pawl selectors being rotated by the shaft 5, the edges of the pawl selectors pass along the arms of the pawls.
  • the periphery of a pawl selector is circular for the major part but for a small part it comprises a recess (37, 38, 39).
  • a recess On this recess registering with the arm of a pawl, the end of the arm moves into it under the influence of a spring (25, 26, 27) without the pawl selector becoming locked. The end of the pawl adjacent the locking disc is then urged by the spring against the edge of this disc.
  • the angle through which the recess (37, 38, 39) extends need not have an accurately defined value but must be smaller than n being the number of pawls.
  • the shaft 5 must be caused to turn and be locked when the recess (37, 38, 39) of the pawl selector registers with the arm of the pawl concerned.
  • the drawing shows the pawl selectors occupying positions in which the arms 34, 35 and 36 are about to move into the recesses of the pawl selectors.
  • a locking element comprising an electro-magnetically operated pawl (selector pawl) 49 and a pawl wheel 41, which is firmly seated on the pawl selector shaft 5.
  • This locking element is controlled by a position selector 42.
  • the latter comprises a movable contact arm 43 and as many stationary contact members as there are locking positions of the pawl selector. In the embodirnent shown by way of example this number is 8.
  • the stationary contact members are designated I to VIII. They are electrically connected to the corresponding stationary contact members I to Vlll of a position switch 44, the movable contact member of which is secured to the pawl selector shaft 5.
  • the electric connections may have any length, so that the position selector 42 may be remote from the position switch 44 and the pawl knob mechanism.
  • Fig. 1 shows the movable contact member of the position switch and its contact arm 45 which cannot contact periodically with more than one stationary contact member of this switch.
  • the contact arm of the position selector 42 is moved into position I.
  • the shafts 12 and 5 are set rotating and thus the contact arm 45.
  • a circuit is closed. The current passes in this circuit from one of the terminals 47 of a current source (not shown) through the contact arm 43 of the position selector 42, the stationary contact member I and then through the stationary contact member I of the position switch 44 and contact arm 45 and thence to the coil 48 of an electromagnet 49.
  • the pawl wheel 41 comprises as many teeth as there are locking discs on each pawl knob, that is to say eight in the example described.
  • the selector pawl 40 is shown 111 Fig. 1 to have just dropped on the back of one of the teeth 52 and engages it.
  • On the pawl wheel 41 has turned through a small angle a, the front of the next following tooth 53 abuts against the selector pawl 40 and the pawl wheel, and hence also the shaft 5 with the pawl selectors 6, 7 and 8 are locked.
  • contact arm 45 is midway on the stationary contact member I, so that an adequate contact is maintained and the doubled over ends of the arms 34, 35 and 36 engage the recesses 37, 38 and 39 of the pawl selectors 6, 7 and 8.
  • the device might be constructed so that at this instant the direction of rotation of the motor is reversed and not until then the pawl knob shafts are thus set rotating, the
  • separating device 10 being thus enabled to be a condisc 62 is firmly seated on the driven shaft, thus for exventional ratchet-gear coupling and a coupling of this ample, on the pawl knob shaft 16.
  • the springs must be kind being also required between the gear wheel 4 and sufiiciently rigid to transmit, without excessive extension, the shaft 12. the normal torque from the disc 60 to the disc 62.
  • the driving 5 torque increases the springs are extended to a further arrangement rotates in the same direction for operating extent, so that the driven shaft slightly lags behind the the pawl selectors as for actuating the pawl knob shafts. driving shaft.
  • the separating device is formed as Secured to the disc 62 is a stud 64 which extends to an overload coupling This may be a friction clutch but the front through a slot 65 of disc 60 and. which is moved alternatively, use may be made of a coupling of the kind 10 in this slot upon relative movement of the driven shaft mentioned above as suitable for use with the shafts 16, with respect to the disc 60.
  • the springs 63, the stud 64 due to its displacement en- Consequently, even though shaft 5 is locked by selecgages the pawl 61 urges it upwatds and forces it to recontlnue to rotate.
  • the locking discs which have already engaged, the shafts being thus fully separated.
  • the motor 1 Upon locking of all the pawl knobs the motor 1 Upon the shafts being separated the disc 60 is remay be held with the use of switch 46, which may be tracted by the springs 63 and, without further expedients, arranged in the proximity of the position selector 42.
  • switch 46 For pawl 61 would be released by the stud 64 and the pawl, subsequently changing the position of the control shafts, which is under spring stress, would re-engage the teeth all that needs to be done is to displace the contact arm of the pawl wheel 59. his, however, is prevented by the 43 and to close the switch 46.
  • the control current of provision of a clamping device which prevents retraction the magnet 49 is then interrupted and a spring 54 moves 25 of the disc 60.
  • a clamping pawl 66 formed the selector pawl 40 into its inoperative position. as a roller or a ball which is arranged in a wedge-shaped
  • the control current of space between the outer surface of disc 60 and the inner electromagnet 49 is invariably closed as long as the shafts wall of a ring 67 which surrounds the disc 60.
  • the springs 63 tend to turn the separated disc 69 in the the locking element may be made to operate otherwise, direction opposite to the arrow, the pawl 66 is immedias shown in Fig. 2, the selector pawl being moved into ately jammed.
  • the switch The dFlVlIlg S haft Whlch 111 Flgufe 3 eXt11dS t0 e n 58 is not closed and hence, on the switch 57 being opened has seated on it a pawl wheel 59.
  • dlsk 60 which is by the spring 54, the 'motor 1 is not kept actuated by a adapted to while freely about h driven Shaft, pp current passing through the switch 58.
  • the overload coupling 10 is provided, between driving shaft and selector shaft, with a switch 72 operating in a manner similar to that of the switch 58 and similarly thereto connected in parallel to switch 57.
  • Switch 72 is closed so long as both the shafts 9 and 73 coupled by coupling 10 rotate. Consequently, in the event of switch 58 not taking the function of switch 57 when the latter is opened, this is done by switch 72.
  • the motor continues to rotate until the pawl selector shaft is locked, whereupon th; shafts 9 and 73 are separated with the result that switch 72 is opened.
  • switch 57 cannot be dispensed with, since the former is capable of breaking the circuit but not of starting the motor.
  • the springs 63 of the overload coupling release and pull the shaft 73 along with them, but the locking member 67 is not subjected to any force that urges it into the direction of rotation of the shaft until the driving shaft together with the pawl wheel 59 starts to rotate.
  • the switch 57 is therefore required to close the circuit of the motor.
  • a shaft positioning device including a pawl knob, said pawl knob comprising a pawl selector, a locking disc, and a pawl member mounted in operative relationship with said pawl selector and said locking disc, said pawl selector comprising means for rendering said pawl operative to engage said locking disc in locking relationship therewith in a predetermined position of said pawl selector, undirectional and common driving means for said pawl selector and said locking disc, an overload coupling interposed between said common driving means and said pawl selector, said overload coupling comprising means for completely separating said pawl selector from said driving means upon overload and resilient means operable upon such separation to subject said pawl selector to a driving torque, and selectively operable means for locking said pawl selector in said predetermined position.
  • a shaft positioning device including a pawl knob, said pawl knob comprising a pawl selector mounted on a first shaft, a locking disc mounted on a second shaft, a pawl member mounted in operative relationship with said pawl selector and said locking disc, said pawl selector comprising means for rendering said pawl operative to engage said locking disc in locking relationship therewith in a predetermined position of said pawl selector, common electric motor driving means for said pawl selector and said locking disc, a circuit connected to said electric motor means for energizing the same, a switch in said circuit, a separating device interposed between said common driving means and said pawl selector for completely separating the connection between said driving means and pawl selector upon overload, selectively operable means for mechanically locking said pawl selector in said predetermined position, and electromagnetic control means controlling both said switch and said selectively operable means for locking said pawl selector.
  • a shaft positioning device including a pawl knob
  • said pawl knob comprlsing a pawl selector, 9. locking disc, and a pawl member mounted in operative relationship with said pawl selector and said locking disc, said pawl selector comprising means for rendering said pawl operative to engage said locking disc in locking relationship therewith in a predetermined position of said pawl selector, common electric motor driving means for said pawl selector and said locking disc, a circuit connected to said electric motor means for energizing the same, a first switch in said circuit, an overload coupling interposed between said common driving means and said pawl selector, a second overload coupling interposed between said common driving means and said locking disc, selectively operable means for locking said pawl selector in said predetermined position, and control means for said switch, said control means being actuatable by said means for locking said pawl selector, a second switch connected in parallel with said first switch, and means actuated by said second overload coupling for controlling said second switch.
  • a shaft positioning device including a pawl knob, said pawl knob comp ising a pawl selector, a locking disc, and a pawl member mounted in operative relationship with said pawl selector and said locking disc, said pawl selector comprising means for rendering said pawl operative to engage said locking disc in locking relationship therewith in a predetermined position of said pawl selector, common electric motor driving means for said pawl selector and said locking disc, a circuit connected to said electric motor means for energizing the same, a first switch in said circuit, a first overload coupling interposed between said common driving means and said pawl selector, a second overload coupling interposed between said common driving means and said locking disc, selectively operable means for locking said pawl selector in said predetermined position, and control means for said switch, said control means being actuatable by said means for locking said pawl selector, a second switch connected in parallel with said first switch, and means actuated by said second overload coupling for controlling said second switch
  • a shaft positioning device including a pawl knob, said pawl knob comprising a plurality of pawl selectors and a plurality of corresponding locking discs, a plurality of pawl members each mounted in operative relationship with each pawl selector and corresponding locking disc, each pawl selector comprising means for rendering an associated pawl member operative to engage an associated locking disc in locking relationship therewith in a predetermined position of said pawl selector, unidirectional and common driving means for said pawl selectors and said locking discs, an overload coupling interposed between said common driving means and said pawl selectors, and selectively operable means for locking said pawl members in a number of predetermined positions equal to the number of pawl members, said selectively operable means comprising a pawl and a pawl wheel, and a position selector controlling said selectively operable means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transmission Devices (AREA)
  • Mechanical Control Devices (AREA)
US77424A 1948-02-23 1949-02-19 Automatic shaft positioning apparatus Expired - Lifetime US2707041A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL810163X 1948-02-23

Publications (1)

Publication Number Publication Date
US2707041A true US2707041A (en) 1955-04-26

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ID=19837275

Family Applications (1)

Application Number Title Priority Date Filing Date
US77424A Expired - Lifetime US2707041A (en) 1948-02-23 1949-02-19 Automatic shaft positioning apparatus

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US (1) US2707041A (fr)
DE (1) DE810163C (fr)
FR (1) FR980695A (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204521A (en) * 1937-05-26 1940-06-11 Universal Gear Corp Power transmission mechanism
US2216272A (en) * 1935-01-21 1940-10-01 Harold J Kaye Selector control mechanism
US2256781A (en) * 1940-09-06 1941-09-23 Cotta Transmission Corp Overload release mechanism
US2285414A (en) * 1939-11-08 1942-06-09 Arthur A Collins Control system and apparatus
US2323170A (en) * 1940-04-03 1943-06-29 Rca Corp Spot adjusting mechanism for radio transmitters
US2461298A (en) * 1944-10-05 1949-02-08 Gen Electric Combination coupling and overload cam operated device
US2466776A (en) * 1946-12-14 1949-04-12 Collins Radio Co Automatic shaft controlling apparatus
US2467422A (en) * 1946-08-02 1949-04-19 Collins Radio Co Automatic radio control apparatus
US2493622A (en) * 1944-10-28 1950-01-03 Rca Corp Automatic selector mechanism
US2585955A (en) * 1946-01-05 1952-02-19 Collins Radio Co Shaft positioning device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216272A (en) * 1935-01-21 1940-10-01 Harold J Kaye Selector control mechanism
US2204521A (en) * 1937-05-26 1940-06-11 Universal Gear Corp Power transmission mechanism
US2285414A (en) * 1939-11-08 1942-06-09 Arthur A Collins Control system and apparatus
US2323170A (en) * 1940-04-03 1943-06-29 Rca Corp Spot adjusting mechanism for radio transmitters
US2256781A (en) * 1940-09-06 1941-09-23 Cotta Transmission Corp Overload release mechanism
US2461298A (en) * 1944-10-05 1949-02-08 Gen Electric Combination coupling and overload cam operated device
US2493622A (en) * 1944-10-28 1950-01-03 Rca Corp Automatic selector mechanism
US2585955A (en) * 1946-01-05 1952-02-19 Collins Radio Co Shaft positioning device
US2467422A (en) * 1946-08-02 1949-04-19 Collins Radio Co Automatic radio control apparatus
US2466776A (en) * 1946-12-14 1949-04-12 Collins Radio Co Automatic shaft controlling apparatus

Also Published As

Publication number Publication date
DE810163C (de) 1951-08-06
FR980695A (fr) 1951-05-16

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