US 1837140 A
Description (OCR text may contain errors)
Dec. 15, 1931. w THEW 1,837,140
APPARATUS FOR DELIVERING ELECTRIC IMPULSES FROM A SOURCE OF CURRENT SUPPLY Filed Dec. 9, 1930 Patented Dec. 15, 1931 UNITED STATES wim'oar rnzw, or Lennon, uremia APPARATUS FOR nmvname m0 naru'nm miasovmorcunur SUPPLY Application fled member 9, 1880, Serial Io. 801,15), and in Great Britain. 18, I.
This invention relates to apparatus for delivering electric impulses from a source of current supply of the kind comp a freely vibrating member which alternate y closes and opens a circuit. The object of the invention is to provide an improved ap aratus of this type more particularly inten ed 'for use where the current impulses are not required continuously for long periods, which be of simple and in naive construction,"reliable in action an readily brought into and out of operation.
To this end ap aratus according to the present invention or delivering electric im-,
p lses from a source of current supply comprises, in addition to a make-andreak device comprising a freely vibrating member I which alternately closes and opens a gap in -vice is included,
break device conveniently sprintgy arm held rigidly at one end and, as
st te s a base 'havin a circuit, a switch arranged in sense with the make-and-break device so as to control the circuit in which the make-and-break deand means whereby movement actuating the said current controlling switch will mechanically set in motion the vibratory member of the make-and-break device. I
The vibratory member of the make-andcomprises a o mounted on the movable part of the switch or circuit-closing device controlling the main flow of current through the circuit in which the make-and-break device is 7 included as to be caused to vibrate whenever such part of the switch is moved to close the circuit. Thus in one convenient arrangement the circuit-closing device or switch controlling the main flow of current inthe circuit in which the make-and-break device is included has two relatively movable parts of which that one which is normally moved to close the circuit, carries a ri arm constituting the vibratory mem r o the makeand-break device so that vibration of such vibratory member "will be caused owin to the inertia of the free part of the arm V518!) such switch part is moved to close the circuit For example the apparatus may comprise hinged thereto a which one en of the springy arm is rigidly ertia of the wei support -to connected, the other end of the arm preferably being weighted. An electric contact on the arm is adapted alternately to make and break contact with a second contact as the arm vibrates and a switch is provided controlling the circuit through the contacts and operated by movement of the hinged support relatively to the base. Thus the movement of the hinged support to close the switch causes an initial vibration to be imparted to the vibratory ring b reason of the inted end thereof. Preferably the hinge support is acted on by a spring which tends to separate it from the base, the closing of the switch' to complete the circuit through the contacts and to im part an initial vibration to the vibratog.
member being effected by su rt towards the base.
e invention is particularly applicable to apparatus for delivering a series of electric current impulses to a dental or surgical chisel of the kind described in the ification of the present applicants copen ing apglication for Letters Patent of the United tates of America No. 384,699, and in this case the apparatus is conveniently adapted to be foot-operated, the bin d su port being provided for example wi a lid or cover which is acted upon by the foot so as to depress it together with the su port to close the switch and impart the desired initial vibration to the vibratory arm. With such apparatus the contact carried by the vribratory arm is'if desired arranged on the upper face of this arm so as to engage its cooperating stationary contact when the arm rises, the arrangement being such that the apparatus can be inverted and when so inverted the weighted end of the arm will cause the two contacts to be brought into continuous engagement so that closing of the switch by depressing what is normally the base circuit so asto deliver a single electric impulse. i
The/invention may be carried into practice in various ways but one construction according to this invention is illustrated by way'of moving the of the apparatus will then complete the 95 example in the accompanying drawings, in which Figure 1 is a side elevation partly broken away, i Figure 2 is a sectional plan, and Figure 3 a section on the line 3-3 of Figure 1.
. In the construction illustrated the apparatus comprises a base A adapted to rest upon the floor and a platform, B, hereinafter termed the hinged support, hinged at C at one end to the adjacent end of the base A. Thehinged support B carries an insulating block D secured thereto and clamped between the upper face of this block and the lower face of a metal plate E is a leaf spring F carrying a weight F at its free end. Mounted on the leaf spring F at a point intermediate in its length is an electric contact G adapted to cooperate with a stationary and preferably adjustable contact G which is carried by a metal plate Gr secured to the hinged support B. The arrangement is such that as the leaf spring F vibrates the two contacts G, G alternately make and break contact.
Arranged between the upper face of the base A and the under face of the hinged sup port B is a bowed leaf spring H the under surface of the centre part of which engages the base A while its ends extend upwards to engage the under face of the hinged support so as normally to maintain this hinged support in the position shown in Figures 1 and 3.
The hinged support B is provided with a lid J which rests thereon and encloses the vibrating leaf spring F and its associated mechanism, while the base A is provided with side members A which act as' guides to prevent lateral movement of the hinged support B relatively to the base A and to prevent entry of the flexible lead wire which would hold up the downward movement of the hinged member.
Extending along the outer face of one of the side members A is a metal leaf K one end of which is connected to an electric contact K within a junction box L, while its other end extends through a slot A in the side member A as indicated at K to form one contact of a switch the other contact of which is constituted by a pin K mounted in a recess in the adjacentside of the hinged support B so that when this support is depressed against the action of the leaf spring H the two contacts K K are brought into engagement. Alternatively, instead of the leaf spring, a spring-loaded gun-metal ball and socket may be used so that in either case a rubbing contact is obtained, thus ensuring that any sparking which may take place is completed before the foot is fully pressed down.
The contact K is connected to the metal plate G by a conductor K while the metal plate E is connected by a conductor E to a stud E constituting one of the securing screws for one half of the hinge C. The other half of the hinge C which is secured to the base A is connected by a further conductor E to a second contact E in the junction box L. From the two contacts E and K respectively lead flexible conductors constituting a twin cable M.
It will be seen that with the arrangement above described, when the lid J, and hence the hinged su port B, is depressed, for example by the cot, the contacts K, K will be brought into engagement and, at the same time, owing to the inertia of the weight F the depressing of the hinged support will cause the leaf spring F and member F' to oscillate so as alternately to make and break contact between the contacts G and G Thus in operation when the hinged support B is depressed to close the contacts K K the leaf spring F will be set in oscillation to close intermittently the circuit through the whole apparatus from one of the conductors M by way of the contact K metal strip K, contacts K K conductor K metal plate G, contacts G, G, spring F, metal plate E, conductor E hinge G and contact E to the other conductor M, whereby a series of electric im-. pulses will be transmitted. As soon, however, as the hinged support B is released it will move upwards under the action of the spring H so as to break connection between the contactsK, K and thus open the circuit.
If desired the weight F may be adjustable along the spring F so as to vary the period of oscillation of this spring while, further, in some cases the fixed contact G may be arranged above the leaf spring F so that by inverting the device the weight of the member' F will cause the contacts G, G to come into continuous en agement whereupon by depressing the base the circuit can be closed so as to deliver a single electric impulse.
It is to be understood that the constructions described above are given by way of example only and that the arrangement of the vibratory member and the switch whereby the apparatus is rendered inoperative and brought into operation as well as other details of construction may be varied without departing from this invention.
What I claim as my invention and desire to secure by Letter Patent is 1. Apparatus for controlling the delivery of electric impulses from a source of current supply, including in combination a makeand-break device comprising a freely vibrating member, a movable contact operatively connected to the vibrating member and a relatively fixed contact with which the movable contact cooperates, a switch including a movable member arranged in series with the make-and-break device, and means whereby movement actuating the switch will mechanically set in motion the vibrating memto move the hinged support away her of the bake-and-break device. from e base, and a make-and-break device 2. Apparatus for controlling the delivery arranged in series with the switch and comof electric impulses from a source of current prising an arm of a springy nature, means 5 supply including in combination amake-andor securing one end of the arm ri 'dly to break device comprising a movable sup ortthe hinged support,'a weight at the other end ing member, an arm of a s ringy nature, of the arm, a contact on t e arm and a fixed means for securing one end 0 the arm to the on a t On he hinged support cooperating sup orting member, aweight on the other end with the contact on the arm.
10 of t e arm, a contact on the arm and a fixed In stlmony whereof I have signed my 7 contact cooperating with the contact on the name to the specification. I
arm, a switch arranged in series with the WILTON THEW. make-and-break device, and means whereby movement of the supporting member actuates the switch and simultaneously sets in motion the springy arm by reason of the inertia of the weight.
3. Apparatus for controlling the delivery of electricim ulses from a source of current supply inclu ing in combination a switch '5 comprising a movable and a fixed part, and a make-and-break device in series with the switch comprising a springy arm, means for securing one end of the springy arm rigidly to the movable part of the switch, a weight at the other end of the springy arm, one contact on the arm and another contact cooperating with the contact on the arm,
4. Apparatus for controlling the delivery.
of electric im ulses from a source of current supply inclu ing in combination a switch comprising a movable and a fixed art, a make-and-break device in series with the switch and comprising a freely vibrating member carried by the movable part of the switch, a movable contact 0 ratively connected to the vibrating mem zr and a fixed contact which is carried by the movable part of the switch and with which the movable con- 40 tact cooperates, so that movement of the mova m able part of the switch to close this switch mechanically sets in motion the vibrating member of the make-and-break device.
5. Apparatus for controlling the. delivery of electric im ulses from a source of current 110 supply inclu ing in combination a base, a a support hinged to the base, a switch which is automatical y closed when the hinged support is moved towards the base, and a makeand-break device arranged in series with the switch and comfirising a freely vibrating member carried y the support, a movable contact operatively connected to the vibrating member and a fixed contact carried by the hinged support with which the movable contact cooperates whereby movement of the hinged support towards the base, in addition to closing the switch sets in motion mechanically the vibrating member.
00 6. Apparatus for controlling the delivery of electric impulses from a source of current supply including in combination a base a support hinged to the base, a switch comprismg a contact on the hin (1 support and a cooperating contact on the base, a spring 130