US877881A - Escapement. - Google Patents

Description

PATENTED JAN. 28. 1908.

V G. W. BENNUM.

ESGAPEMENT. APPLIOATION FILED MAY 16,1905.

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GEORGE W. BENNUM, OF GEORGETOWN, DELAWARE.

ESCAPEMENT.

Specification of Letters Patent.

Application filed May 16, 1905. Serial No. 260.650.

Patented Jan. 28, 1-908.

vide an escapement whereby the friction will be reduced between the pallets and the escapement-wheel so that a lighter spring or weight can be used in the motor.

With these ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, the construction and operation will now be de scribed in detail, referring to the accompanying drawing forming a part of this specification, in which Figure 1 is a side elevation of my improved escapement, one disk of the escapement- Wheel being removed to show the rollers; Fig. 2, a cross-section through one edge of the escapement-wheel.

A represents the escapement-wheel which in this instance consists of the disks A, between which at their peripheries are journaled the series of rollers B spaced a certain distance apart, of course, instead of two disks one disk could be used if desired, but it would not be as practical.

C represents the pallets which are pivoted at the point C and extending downward from the pallet is the verge-rod D, through the lower end of which extends the pendulumrod E. The contacting faces of the pallets are made concentric with the pivotal point of the pallets, so that when the pallets move in and out of'engagement with the rollers the least possible amount of friction is generated in the movement. The escapement operates in the usual manner by the step by step movement, common to all escapement, as the pallets move in and out of engagement, and the inner ends of the pallets are beveled in such a direction, as illustrated at C so that the movement of the escapement-wheel, as the pallets move out of engagement with said wheel, will cause the rollers to strike these inclined surfaces 0 and give an impetus to the verge-rod, and consequently to the pendulum-rod E, and the rollers B, wherever they i come in contact with the pallets are free to revolve upon their axis, and consequently the friction between the escapement-wheel and pallets is very slight, and therefore the motive power can be reduced accordingly, which will not only cheapen the construction but also reduce the wear upon all parts of the motor, for, of course, there will not be as much power exerted upon the cog-wheels, and in time-pieces more accurate time will be kept.

These escapements could be applied just as well to the lever movement where a pendulum is not used.

I do not wish to be limited to the exact construction here shown, as slight modifications could be made without departing from the spirit of the invention.

In connection with the pallets it is to be noted that immediately below the contact points or fingers said pallets are provided with a relatively outwardly and downwardly curved bearing face. This face has an important function in connection with the pallet in that said face is first engaged by the rollers of the escapement wheel in the return of the pallet to operative or holding position, and that owing to the peculiar curvature of this face an initial impetus or impulse is imparted to the pallet and pendulum, which, together with the bevel face of the pallet fingers results in imparting a double impulse to the pendulum.

Having thus fully described my invention, what I claim as new and useful, is

1. In combination, an escapement wheel comprising a pair of pivoted disk members capable of revolution, a series of rollers mounted on the disks for independent revolution, pivoted pallets adapted to contact with said rollers, the contacting faces of said pallets being curved concentrically of the pivotal point thereof, and a verge rod con nected to the pallets, the innermost edge of the pallets being beveled, the face of the pallet below the engaging fingers thereof being outwardly and downwardly curved relative to said fingers, whereby a double impetus will be given to the verge rod as the pallets move out of engagement with the rollers.

2. In combination, an escapement wheel having independently-movable pallet-engaging members, and pivoted pallets arranged to engage said members, the engaging face of each pallet being curved on a plane concentric with the pivot thereof, the relatively 10 an engaging face curving outwardly and downwardly relative to said finger, said curved face being adapted to engage the escapement pins and impart an initial impetus to the pendulum prior to the engagement of the pallet fingers with said pins.

In testimony whereof, I have hereunto affixed my signature in the presence of two subscribing witnesses.

\ GEORGE W. BENNUM.

Witnesses:

RoB'r. C. WHITE, JAs. H. OHIPMAN.

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