US1694220A - Reversing-propeller throttle control - Google Patents

Description

Dec. 4, 1928. 1,694,220

' C-F-JENKINS I R EVER SING PROPELLER THROTTLE CONTROL Filed July 23, 1927 Patented Dec. 4, 1928.

.UNITED STATES 1,694,220 PATENT OFFICE.

REVERSING-PROPEELER THROTTLE CONTROL.-

Application filed July 23,

This invention relatcsto airplanes, and has for its principal object devices for bringing an airplane to a stop promptly after touching the ground and is supplemental to the subject device of Patent No. 1,634,904.

Ithas been found that reversing the pitch of the propeller blades after the plane has touched the ground, and then opening the. throttle of the motor to give reverse power to the propeller, introduces a delay that, if not actually dangerous, certainly is not conducive ,to the promptest possible stop, often where seconds count because of the high landing speed of some planes.

This invention seeks, therefore, to further reduce the hazard of landing by still more promptly stopping the plane after it alights.

With this and other objects in view the in vention consists in the novel details of construction and combination of parts more particularly pointed out in the claims.

Referring to the accompanying drawings forming a part of this specification,.in which like numerals designate like parts in all of the figures I Figure 1 is an airplane; Figure 2 the mo-- tor-section motor-propeller section of the p plane; and Figure 3 the blade-rotatinglever,

lock, and throttle-actuating catch.

In the several figures, A is a propeller,the blades of which may be rotated about their longitudinal axis; B a collar slidable along the engine shaft, and connected by links. C to levers D on the hub-end of each blade; E a loose ring in a groove on collar B, wliich advances or retracts the collar to partiallyrotate the blades to give them a different angular attack on the air; F a connecting rod from ring E to the hand lever G, which is in two 40 parts. The two parts of the hand lever are pivoted at H and one of the parts, G, has a. notch J in the lower, quadrant-shaped end of it to engage with a latch K. This latch is pivoted at L and has attached thereto rods M and N, one of which, N, is fastened to the tail-skid P, and the other, M, attached to some part of the landing-gear truck, R, which, as usual, supports the plane on springs, i. e., springsbetween truck and fuse- 60 lage.

S isa safetyblock on the lower end of lever which prevents the latch K from being pulled out by the landing gear until the block is moved from under the latch Whenlever G is pushed forward. Each of the rods M and N has a spring end Z, so that the shock gear before the lever locked part-of the lever,

the truck, or both,

1927. Serial No 207,949.

damage the reversing can be moved. P is a rod attached to the throttle, the opposite end of which has a notch Q therein, to be engaged by the pawl'W operable by the latch r is a foot lever to set the whole mechaof landing does not .nism back to zero, that is, in locked position for a take-off.

The displacement of the safety block .8 is the first result of the movement of the hand leverG. This forward movement of the le ver also brings the pin T on the lever against one of the detents on the upper end of the and further movement partially rotates. the blades of the propeller, The further movement referred to is possible only when the lever is unlocked by' the landing gear, either the tail-skid of coming into contact with the ground.

Such setting of the blades. renders the propeller effective in stopping the machine when the engine is turned up to such speed as circumstances may require.

in reverse in the smallest possible time after the blades are reversed, the. same lever which reverses the blades is arranged to open the engine throttle. This saves vital fractions of secondsin theprocess of a quick stop, where the time the pilot requires to change his hand irom reversing lever to throttle might be atal.

- After the plane stops, the locking-latch remains out of engagement With the notch J because the the truck is pushing up on the spring-ended rod M. So to prepare the plane for a takeofi and flight the pilot puts his foot on the permitting the latch K to enter the notch if and be lockedin place'by the block S. In such position the regular throttle of the motor is free for service in the usual manner.-

In these specifications the Word ground is In order that the power may be turned on Weight of the plane onpedal X and pushes down on the sprin used to mean the landing surface upon which theplane comes to'rest, and obviously, may

be the surface of water, the deck of aship, an elevated landing platform, or the like.

.What I claim, 1s 1. The combination, in an airplane, of a motor therein, a throttle for controlling said motor, a propeller driven by said motor, re-

versing gear for saidpropeller, alever for controlling the reversing gear, means. for' connecting said throttle and reversing-gear lever to insure simultaneous operation of the two,,and means for preventing operation of said last mentioned means until the airplane engages the landing surface.

2. The combinatlon, in an airplane, of a motor therein, a throttle for said motor, a

-pr peller driven hy said motor, reverslng gear for said propeller, means for simultaneously operating the, throttle and; the reversing gear, and means for locklng said means 1n opv erative position.

3. The combination, in an airplane, of a f motor therein, a throttle for said motor, a propeller driven by SEtlCl 'motor reverslng gear for saidpropeller, means which may be used at will for simultaneously operating the throttle and the reversing gear. means for locking said operating means, and means oppropeller driven by said motor, reversing.

gear for said propeller, means for locking said reversing gear, and meansffor unlocking the same When the plane contacts with the ground, and means for again locking the reversing gear While the weight of the plane is v on the ground.

In testimony whereof I have affixed iny signature. 5

CHARLES FRANCIS JENKINS

Images