US1285905A - Secondary clock. - Google Patents

Description

L. O. BEARD.

SECONDARY CLOCK.

APPLICATION FILED MAR. 7 19!].

Patented Nov. 26, 1918.

IN VEN TOR LAWRENCE O. BEARD, OF LANCASTER, PENNSYLVANIA.

SECONDARY CLOCK.

Specification of Letters Patent.

Patented Nov. 26, 1918.

Application filed. March 7, 1917. Serial No. 153,083.

To all whom it may concern:

Be it known that I, LAWRENCE O. BEARD, a citizen of the United States, and a resident of Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Secondary Clocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in secondary clocks and particularly to such as employ mechanism controlled and actuated by electromagnetic means,one object of the invention being to so construct a secondary clock that it shall be accurate in operation and at the same time reduce to a minimum the noise of moving parts.

With this and other objects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings; Figure 1 is a sectional view on the line l1 of Fig. 3 showing the operating mechanism in elevation; Fig. 2 is a similar view on the line 2-2 of Fig. 3; .Fig. 3 is a plan view, and Fig. 4 is a view of a modification.

1 represents a frame such as employed for secondary clock movements, and 2 the escapement wheel of such-movement.

An arbor 3 is located in the upper portion of the frame 1 and a lever & having a general L-shape, is supported at the juncture of its upright and horizontal portions, by said arbor. The depending portion of the lever 44; is made with laterally projecting arms to form a verge 5 having pins or pallets 6 near the free ends of said arms for coopera tion with the escapement wheel 2, and the notches between the teeth of said escapement wheel are of such depth that the pallots of the verge will not, during the oscillation of the verge, move to the bottoms of said nctches,--thus minimizing the noise of the escapement.

An electro-magnet 7 is suitably supported in the frame 1 and is intended to be included in the circuit of a master clock, as is well understood. An arbor 8 is mounted in the frame 1, above the poles of the magnet and carries a swinging armature 9, connected with said arbor by means of arms 11. and

12, the constructioi'i being such that the armature will oscillate over the pole of the magnet in a direction at approximately right angles to the axis of the latter. The er i 11 is made with an extension 13 provided with a pin 14, with which latter one end of a spring 15 is connected. The other end of said spring is attached to the frame 1, and said spring serves to move the swinging armature in a direction opposite to that in which it is moved by the magnet. The arm 12 connecting the armature with the arbor 8 is made in the form of av plate which extends an appreciable distance beyond said arbor and is provided with a cam slot 16 into which a pin 17 projecting laterally from the horizontal arm 18 of the verge lever 4.- enters. By means of this construction, the armature 9 will be oscillated by the action of the magnet 7 and spring 15 and the verge will be oscillated by cooperation of the cam plate or arm 12 with the horizontal arm of the verge lever. As the moving of the devices above described do not strike limiting stops of any kind, noise in their operation is reduced to a minimum.

A propelling pawl 19 is pivotally mounted or. the verge lever, (preferably on one of the arms of the verge 5) in position to engage the teeth of the escapemcnt wheel. In order to obviate noise which might occur if the pawl were permitted to drop deeply into the notches between the teeth of the escapement wheel and strike the teeth in moving from one to another, I provide a pair of small leaf springs 20 which are secured at one end to a pin on theverge and near their free ends embrace'a pin 22 projecting laterally from the propelling pawl 19. These springs will cause the pawl19 to float and prevent the same (during its retrograde movement) from striking a tooth of the escapement wheel behind the tooth which it will engage at the next forward movement of the pawl, and thus noise in the cooperation of the propelling pawl with the escapement wheel will be prevented.

In escapement mechanism of the type to which my invention relates wherein the propelling of the escapement wheel and the time mechanism of the clock, is dependent solely upon the operation of the verge and propelling pawl, it is important that retrograde pawl for the escapement wheel shall be provided. I therefore provide a retrograde pawl 23 hung loosely on the arbor 3 and adapted to engage the teeth of the ratchet wheel. In order to prevent noise which is usually caused by the retrograde pawl riding over the teeth of the escapement wheel and striking said teeth, I provide leaf springs 24 secured to the frame 1 and embracing a. pin 25 projecting laterally from said retrograde pawl. These springs will cause the pawlto float and prevent the same from dropping against the teeth of the escapement wheel.

Slight changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scope and hence I do not wish to restrict myself to the precise details herein set forth,thus instead of employing two leaf springs for causing the pawls 19 and 23 to float, single springs 20 24 may be employed, and the pawls may be provided with pins 22 22, between which said springs project.

Having fully described m invention what I claim as new and desire to secure by Letters-Patent, is

1. In a clock, the combination with an escapement wheel and a verge coo perable therewith, of a floatingpawl having a tooth to engage the teeth of said wheel, yielding means normally holding said pawl supported with its tooth in position to engage a tooth of the Wheel and preventing said pawl from dropping upon an advancing tooth of the wheel.

2. In a clock, the combination with an cscapement wheel, and a gravity pawl for cooperation therewith, of a spring connected with said pawl and normally supporting the same in position to engage the escapement wheel and preventing it from dropping upon an advancing tooth of the wheel.

3. In a clock, the combination with a verge, an escapement wheel, a separate propelling pawl carried by and movable with the verge, and an electro-magnet, of an armature mounted to oscillate across the pole of the magnet, cam devices connecting said oscillatory armature with the verge to move the latter and the propelling pawl in one direction,

and a spring for moving said verge and pawl in the reverse direction.

L. In a clock, the combination with a verge, an escapement wheel, a propelling pawl movable with the verge, and an electromagnet, of an armature mounted to oscillate over the pole of said magnet, an arm having a cam slot, movable with said armature, and a pin on a part rigid with the verge, said pin entering said cam slot.

5. In a clock, the combination with a frame, a verge mounted in said frame and provided with an arm, an eseapement wheel, a propelling pawl movable with the verge, and an electromagnet, of a swinging armature movable over the pole of the magnet, said armature provided with arms pivotally mounted in the frame, cam connections between one of said arms and the verge arm, and a spring attached at one end to on of said armature arms and at the other end to the frame.

6. In a clock, the combination with an escapement wheel, a verge, and pawl to engage said wheel, of means causing said pawl to iloat and preventing it from dropping onto the teeth of the escapement wheel.

7. In a clock, the combination with a frame, of a verge lever-mounted therein and comprising in a unitary structure a verge and an arm, an eleetro-n'iagnet, an oscillatory armature therefor movable in one direction by said magnet, cam devices connecting the oscillatory armature with the arm of the verge lever for transmitting motion from said armature to the arm of the verge lever, a spring connected with said oscillatory armature for moving the same and the verge lever in the other direction, a propelling pawl movable with the verge lever for propelling the escapement wheel, and a retrograde pawl for the escapement wheel.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

LAWVRENCE O. BEARD.

IVitnesses:

J No. L. McGovnnn, JOHN H. MYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C.

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