US1821756A - Compression brake for hoisting drums - Google Patents

Description

Sept. 1, 1931.

c. E. KENDRICK ET AL COMPRESSION BRAKE FOR HOISTING DRUMS 2 Sheets-Sheet 1 Filed July 143, 1929 Inventors 9 Bymw/h I A ttomey SPt- L1931- C. E. KENDRICK ET AL 1,821,756

COMPRESSION BRAKE FOR HOISTING DRUMS Filed July 15. 1929 2 Sheets-Sheet 2 Hime? c Homey Patented Sept.' 1, 1931 l rss PATsr CARL n. KENDRICK AND BERT w.1vioonn, or LITHIA, FLORIDA; SAID Moons Assrenon 'roV SAID KENDRICK COMPRESSION BRAKE FOR HOISTIN G DRUMS Application led July 13,

rihe present invention'relates generally to a hoisting drum and has for its prime object to provide a compression brake operatively associated therewith. .a Another very important object of the in- Jvention resides 'in the combination of a hoisting drum with a piston reciprocably mounted in a cylinder and operatively connected with the hoisting drum, and a valve mechal nism associated with the cylinder to control the intake and exhaust of air therefrom occasioned by the reciprocation of the piston so that said means may bemshut off causing a braking action on the pistons which is effective on the drum to said connecting means.

A still further very important object of the invention resides in the provision of a mechanism of this nature which is simple in its construction, inexpensive to manufacture, easy te manipulate, compact and convenient, strong and durable, thoroughly ethcient and reliable in use and operation, and otherwise well adapted to the purpose for which it is designed.

lVith the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction and in the combination and arrangement of parts as will be 3@ hereinafter more fully described and claimed.

1n the drawings: Figure 1 is a side elevation of an apparatus embodying' the features of our invention.

Figure 2 is a top plan view thereof, showing the cylinder` in section, and f Figure 3 is an enlarged detail section taken substantially on the line 3 3 of Figure 1.

Referring to the drawings in detail, it will be seen that the numeral 5 denotes a base, with the standard 6 arising therefrom, on which is rotatably mounted a drum 7 hav-- ing driving means 8 associated at one end thereof and at the other end`being formed with al gear 9. rThe gear 9 meshes with the gear 1() on the shaft 11 ournaled in bearings at the'upper end of the standard 12 rising v from the base 5. A wheel or disc 14 is fixed to the shaft 11 at the opposite end to the gear 10 and has an off center pin 15 projecting therefrom with which is engaged a connect- 1929. Serial N0. 378,098.

ing rod 16. The .numeral 17 denotes the piston cylinder, mounted in supports 18 rising from the base and held in place by straps 19 or in anyY other suitable manner. Heads 20 and 21 are provided at the ends of the cylinder. The head 21 is provided with the stuffing box 22 at the center thereof through which is slidable a piston 24, reciprocably mounted in the cylinder 17. Pressure actuated safety valves 26 are mounted in the heads 2O and 21. Air intake and outlet pipes 27 lead from the ends of the cylinder and have valves 28 provided with valve operating cranks 29 connected by a control rod 30, so that the valves may be opened and closed simultaneously.

From the above detailed description it will be seen that when the valves 28 are opened, the piston 24 reciprocates back and forth freely, offeringvery little resistance to the turning of the drum 7, either by the mechanism 8 or by the load on the cable 7 when wound thereon, but when it is desired to brake the drum '.7, it is only necessary to close the valve 28, and thus a compression brake is formed as the piston tends to compress the air in the ends of the cylinder and this braking action is transmitted `to the drum through the rod-s 23 and 16, wheel 14, shaft 11 and gearing 9. When compression at either end of the cylinder approaches a dangerous limit, the valve 26 automatically opens to permit escape of air and consequent reduction of pressure.

It is thought that the construction, operation, utility and advantages of thisinvention will now be quite apparent to those skilled in this art without a more detailed description thereof.

The present embodiment of the inventionhas been disclosed in considerable detail merely for the purpose of exemplication, since in actual practice it attains the features of advantage enumerated as desirable in the statement of the invention and the above description. It will be apparent that changes in the details of construction and in the combination and arrangement of parts may be resorted to, without departing from the spirit or scope of the invention as hereinafter claimed or sacriicing any of its advantages.

What We claim as new s:

A compression brake comprising a cylinder, e piston in said cylinder, adapted to be connected to the member to be brakedi air intakeand outlet pipes communicating with the cylinder adjacent opposite limits of the travel of said piston, L normally open valve ineach pipe, en operating rod connecting each valve for simultaneously closing Vand opening saine to regulate the escape andentrance of air from and into Said cylinder, and :1V pressure actuated Valve at each end of the cylinder operable to open the cylinder to the atmosphere when the pressure therein exceeds a predetermined amount.

In testimony whereof We :LHX our signatures.

CARL E. KENDRICK. BERT W.

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