US841091A

US841091A - Holding and releasing mechanism for brake-shafts.

Info

Publication number: US841091A
Application number: US30960406A
Authority: US
Inventors: Andrew Miller
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-04-03
Filing date: 1906-04-03
Publication date: 1907-01-08
Anticipated expiration: 1924-01-08

Description

No. 841,091. v PATENTED JAN. 8, 1907. ,A. MILLER.

HOLDING AND RELEASING MECHANISM FOR BRAKE SHAFTS.

' APPLICATION FILED APR.3,1906\.

2 SHEETSSHEET 1.

[NVENTOR Attorney PATENTED JAN. 8, 1907.

A. MILLER.

HOLDING AND EELEASING MECHANISM FOR BRAKE SHAFTS.

APPLICATION FILED APR. 3. 1906.

2 SHEETS-SHEET 2.

INVENTOR UNITED STATES PATENT, OFFICE.

HOLDING AND RELEASING MECHANISM FOR BRAKE-SHAFTS.

Specification of Letters Patent.

' Patented Jan. 8, 1907 Application filed pril 8, 1906. SerialNb. 309,604.

To all whom it may concern:

Be it known that I, ANDREW MILLER, a citizen of the United States, residing at Connellsville, in the county of Fayette and State of Pennsylvania, have invented a new and useful Improvement in Holding and Releasing Mechanism for Brake-Qhafts, of which the following is a s ecification.

My invention re ates to improvements in pawl holding and releasing mechanism for brake-shafts. H 7

The object of my invention is to provide a mechanism of this character whereby the pawl is readilymoved in or out of engagement with the ratchet carried by the brakeoperating shaft for releasing the same at any time without moving the said shaft, which is usually necessary in brakes of the character to which my mechanism is to be applied.

Another object of my invention is to provide a more sim le and effective mechanism to accom lish t e above results without affecting t e usual operation of the brakeshaft.

In the accompanying drawings, Figure 1 is a side elevation of my improved pawl-operating mechanism in combination with the ordinary brake-shaft as applied to a car. Fig. 2 is a to plan view showing the ratchet-operating ever in its normal position. Fig. 3 is a longitudinal vertical sectional view taken on the line as a: of Fig.2; and Fig. 4 is a sectional View similar to that shown in Fig. 3, with the pawl-carrying member thrown rearwardly and the pawl disengaged from the ratchet-disk.

Referring now to the drawings, 1 represents the platform or the topof a car, according to the character of the car to which my device is applied, and 2 is the ordinary rotary brake-operating shaft, which has at its upper end a wheel or crank for operating the same and the lower end having the usual chain connection with the brake mechanism. -Adjacent to said shaftv the platform or top, whichever it might be, is provided with an inverted-U-shaped frame 3, which is provided with an outwardly-extending arm 4, forming a bearing for the shaft 2 The said shaft' above the arm 4 is provided with a ratchet-disk 5, having on its lower face ratchet-teeth 6. The said invertedUshaped frame has its upper end in a line with the upper face of the ratchet-disk, and pivoted within said frame intermediate its ends at 7 is a pawl-carrying member 8, said member being adapted-to roclgfreely upon said pivot. The upper end ofsaid pawl-carrying member extends upwardly adjacent to the up or end 9 of, the frame 3, the said upper en of the pawl-carrying member being and intermediately pivoted within said bi-' furcated end is a pawl 11, normally in engagement with the teeth of the ratchet-disk. The opposite end of the pawl 11 is weighted at 13 to hold the pawl in said engaged posi tion. member, as will be clearly seen, will move the pawl out of engagement, with the ratchetteeth, and in order to prevent the pawl from moving upwardly beyond the ratchet-disk I provide the upper end 9 of the U-shaped frame with a beveled face or plate 14, against which the pawl rides and by means of which the pawl is guided in its proper position to engage the ratchet-teeth.

The platform or top of the car, whichever ifurcated at 10,

The rocking of the pawl-carryingthe case may be, adjacent the frame 3 is provided with the two

bearings

15 and 16, in which is journaled a shaft 17. The sald shaft intermediate the journals is rovlded with the double crank 18, to whic is con-.

nected in the usual manner the pitman 20. The opposite end of said pitman 20 is bifureated at 21 and is adapted to receive an ear 22, carried by the lower end of the ratchetcarrying member, the said pitman being pivotally connected to said ear by means of a pivot 23, the said ear being on a line with the double crank when the same is in a horizontal position, and the pitman is thus on a dead-center and will hold the pawl-carrying member in its locked position with the pawl engaging the ratchet-teeth of the disk, and thus pressure exerted upon the pawl cannot move the pawl-carrying member. The shaft 17 extends beyond the bearing 15 and has secured thereon the operating-lever 24, which extends in a direction opposite to that of the crank, but parallel therewith. The U- shaped frame is provided with an outwardlyextending lug orarm 25, which is in the path of travel of the lever 24 and limits the forward and downward movement thereof.

From the foregoing description it will be seen that when the lever 24 is down upon the lug the pitman is on a dead-center, and thus the pawl-carrying member is locked with the pawl engaging the ratchet-disk, as shown in ig. 3. This position allows of the ready rotation of the brake-operating shaft the same as with the ordinary brake now in use.

When it is desired to release the brake-shaft, the lever 24 is drawn upwardly, throwing the pitman d of dead-center, and the continued movement of the lever moves the pawl-carrying member rearwardly, carrying with it the pawl, thus releasing the brake-shaft. The

movement of the pawl carrying member when releasing the brake is in the same direction as the force of the ratchet-disk is on the pawl, thus making the releasing of the brakelever easy. The force of the ratchet-disk if strong enough would move the pawl-carrying member rearwardly after the pitman is thrown off of a dead-center.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is Y 1. The combination with a rotary brakeoperating shaft, a ratchet-disk carried there- "carried by said member.

3. The combination with a rotary brakeoperating'shaft, a ratchet-disk carried thereby, of an intermediately-pivoted pawl-carrying member, an intermediately-pivoted wei hted pawl carried by the upper end of sai member, and means carried by the lower end of the pawl-carrying member for operating the same.

4. The combination with a rotary brakeoperating shaft, a ratchet-disk carried thereby, of an intermediately-pivoted pawl-carrying member, an intermediately-pivoted pawl havin one end weighted and holding the o posite endin engagement with the ratchetd1sk,-a double crank adjacent-to and inaline with the lower end of the pawl-carrying member, and a pitman connected to said crankand pawl-carrying member, said pitman being on a dead-center when the pawl is engaging the ratchetdisk. I

. The combination with a rotary brakeof engagement with operating shaft, a ratchet-disk carried thereby, of an intermediatelyivoted pawl-carrying member, an interme 'atelypivoted pawl having one end weighted and holding the opposite end in engagement with the ratchetdisk, a double crank adjacent to and inaline with the lower end of the pawl-carrying member, a pitman connected to said crank and pawl-carrying member, said pitman being on adead-center when the pawl is engaging the ratchet-disk, an operating-lever carried by the crank in a line therewith, and means for limiting the movement of said lever when the pitman is on a dead-center.

6. The combination with a rotary brakeoperating shaft, a ratchet-disk carried there by and having teeth on its lower face, of a frame adjacent to said shaft, apawl-carrying member intermediately pivoted within said frame, a pawl intermediately pivoted within the upper end of said member below the ratchet-disk, a weight carried by one end of the awl for holding the opposite end upwardly in engagement with theratchet-dis and a wedge-shaped guide carried by the frame and adapted to hold and uide the pawl tothe ratchet-teeth of the dis 7. The combination with a brake-operating shaft having aratchet, of a movable pawlcarrying member, and a pawl carried by said member and adapted to be moved in or out 'of engagement with the ratchet-disk.

8. The combination with a brake-operating shaft having a ratchet-disk, of a movable pawl-carrying member, a pawl carried by said member and adapted to be moved in or. out

I the ratchet-disk, a double crank adjacent said movable member, a pitman connected to the pawl-carrying member and to'the crank in such a manner that the .pitman is on a dead-center when the pawl is engaging the ratchet-disk.

In testimony whereof I have signed my name;to this specification in the presence of two subscribing witnesses.

ANDREW MILLER.

Witnesses:

A. HECKMAN, SAMUEL J. DE BOLT.