US2506239A

US2506239A - Quick detachable starter mount

Info

Publication number: US2506239A
Application number: US706457A
Authority: US
Inventors: Richard E Sears
Original assignee: Jack & Heintz Prec Ind Inc
Current assignee: Jack & Heintz Prec Ind Inc; Jack & Heintz Precision Industries Inc
Priority date: 1946-10-29
Filing date: 1946-10-29
Publication date: 1950-05-02
Anticipated expiration: 1967-05-02

Description

May 2 l950 'y R. E. sl-:ARs 2,506,239

' QUICK DETACHABLE STARTER MOUNT Filed Oct. 29, 1946 2 Sheets-Sheet 1 n S Il d??? Q II l N l N S I v- I I os I IG I u; I l a n. "Tte I III i l g INVENToR. RICHARD E. SEARS BYi ATTORNEY May 2, 1950 R. E. SEARS 2,506,239

QUICK DETACHABLE STARTER MOUNT Filed Oct. 29, 1946 2 Sheets-Sheet 2 l uw will H INVENToR. R/cHA RD E. SEARS ATTORNEY Patented May 2*, 195() Richard E. Sears, Shaker Heights, Ohio, ass-ignor' to Jack & Heintz Precision Industries, Inc., Cleveland, Ohio, a corporation of Delaware' Application October 29, 1946, Serial No. 706,45@r p 6 Claims.

Thisinvention relates in general to starters for internal combustion engines and more particularly to means for mounting the starter on the engine for cranking the engine.

In aircraft engines, it is desirable and usual practice to provide means for detachably securing the starter to the engine so that the forward end of the starter extends into the engine crankrcase andto have complementary adjacent ratchet starter and engine crankshaft jaws that are normally disengaged' with means in the starter to effect engagement and disengagement of the jaws. The usual practice is'to provide the starter with a, mounting fiange with a series of holes to receive bolts for fastening the flange to the engine as the forward end of the starter extends into the crankcase. The tightening and loosening of these bolts is time consuming and it is difficult to insure uniform tightness of the bolts in assembly. Moreover, due to inaccessibility in many aircraft, installation and removal of the starter is either so difficult or impossible that some other engine accessoriesm'ust be removed for starter installation, adjustment or removal.

Therefore, it is one of the primary objects of the invention to provide an improved starter mount and one that is simple and effective as a Y quick-detachable mount.

. forth in the following specification and appended claims, certain embodiments thereof being illustrated in the accompanying drawings, in which:

Figure 1 is a view of an aircraft engine starter partly in side elevation and partly in section and a portion of the engine crankcase wall in section as well as the complementary securing screw threads on the crankcase and starter casing with the single bolt for starter installation and removal;

Figure 2 is a fragmentary View in top plan of the starter housing showing the assembling bolt and locking means therefor; and

Figure 3 is a view in section taken along line 3 3 of Figure 2, showing the assembling bolt and locking means therefor.

Referring more particularly to the drawings,

the starter housing is'generally indicated at and the engine crankcase, at 2. In conventional practice the forward, or right, end of the starter as viewed in Figure 1, would be provided with an enlarged mounting ange with a series of bolt holes to receive bolts to extend therethrough for locking the flange to the engine casing. The installation, adjustment and removal of starters in such a manner is time consuming and many times difficult, if not impossible, because of inaccessibility without removing other aircraft engine accessories.

Therefore, in the present invention the engine crankcase may be provided with a ring gear 3, rigid with the crankcase 2, and having female spiral threads to be engaged by similar male spiral threads 5 of a gear adapter 6 which abuts the inner shoulder of a mounting plate 4 secured by bolts 26 to the st-arter housing. To assist in mounting the starter, a series of screw bolts 21 are embedded in the crankcase to extend outwardly through the radial ange of ring gear 3,. On each bolt 21 is a threaded sleeve 28 that extends through a hole in the mounting plate 4 t0 position the starter and prevent its turning.

With such an assembly, it is readily seen that a manual rotation of the pinion 9 in one direction forces the gear adapter 6 to rotate inwardly in the ring gear 3 which draws the starter, with its engine cranking jaw 29, intothe crankcase, to the right, by outward pressure of the gear adapter 6 on the mounting Yflange 4, and a similar manual rotation of the pinion in the opposite direction withdraws the starter from the crankcase, to the left. Y

For the purpose of providing 'a simple single control means for so rotating andso installing, adjusting and removing the starter, the starter housing is provided with an angularly extending bore 'I in its wall to receive a bushing 8 in which is removably secured a manually rotatable pinion 9. This pinion is provided with bevelled teeth I0 to engage similar teeth II on the inner end of the gear adapter 6. Thus a manual turning of pinion 9 physically moves the starter into or out of the engine crankcase according to the direction of manual rotation of the pinion.

The novel automatic locking means for locking the pinion in any adjusted position is best shown in Figures 2 and 3. In greater detail the pinion has a pivot bearing point 30 to engage a corresponding extension of bore 1. The pinion has a reduced diameter portion I2 to receive a packing ring I3. Loosely fitting over the pinion is a plate I4 apertured to receive the pinion 8 An application of a wrench to effect turning of the nut 23, and hence the pinion 9, and the simultaneous downward pressurejwith the wrench upon plate I against the action of compression Coil springs 2e and 25, brings the dodecagonal aperture 22 out of registry with the hexagonal nut 23 and permits the latter to be turned in either direction. Release of manual downward pressure on plate l'I permits

springs

24 and 25 to restore registry between the hexagonal nut -23 and the dodecagonal aperture 22 which latter automatically andeffectively locks -nut 23 against `rotation `in either direction.

From-the Aforegoing, it will be Yseen that .there haslbeen provided a simple and veflicient means whereby an engine starter may be quick detachabl-y secured to an engine for engine crank `ing'fpurposes and an automatic locking means thateiectively locks the starter in any desired adjusted position without interference in the manual installation, adjustment or removal of the starter `from .the engine.

I claim:

1. -In a, device for securing, adjusting and detaching a pair of housings having complementary .-engageable threaded members, an internal gear carried by one 0f said housings, a single manu fally vrotatable pinion extending inwardly from the-exterior through said housing andengaging saidiinternal .gear to rotate the latter in either direction to .move said zliousing into or out Aof the other housing and means for locking said .rstzhousing in any adjusted position,

"2.*In a device for securing, adjusting and deftaching a pair of housings'having complementary engageable threaded members, an internal gear carried .by one of said housingaa single rnanuially :rotatable pinion extending inwardly from ithe exterior through said Ahousing and engaging saidnternallgear to rotate the latter in either direction to move said housing into or out of etheiother .housing andautomatic locking means ffoirlockingsaid pinion in any adjusted position.

3.-[n..a.device for securing, adjusting and d eftachinga pair of housings having complementary engageable threaded members, an internal Agear Jcarriedlbyone of said housings, a single manu- .ally Yrotatable pinion extending inwardly from tthexterior ythrough said housing and engaging V:said'tinternal gear to rotate the latter in either .directionto move said housing into or out ofthe :other housing and automatic locking means re- -siliently .urged to normally lock said pinion `in .any 1 adjusted position.

4. In a device for securing, adjusting and detaching a pair of housings having complementary engageable threaded members, an internal gear carried by one of said housings, a single manually rotatable pinion extending inwardly from the exterior through said housing and engaging said internal gear to rotate the latter in either direction to move housing into or out of the other housing, automatic vlocking vmeans resiliently urged to normally lock said pinion in any adjusted position, said locking means comprising a member resiliently urged upwardly to said pinion.

A5. In a device for securing, adjusting and detaching a pair of housings having complementary engageable'threaded members, an internal gear carried by one of said housings, a single manually rotatable pinion extending inwardly from the exterior through said housing and engaging said internal gear to rotate the latter in either direction .to .move said .housing into or vout of ythe other housing automatic locking ymeans re- .siliently .urged to normally locksaid .pinion inany adjusted position, said locking means @Qmprising a polygonally .aperture plate and resilient means for 4normally urging .said -plate upwardly 120 .engage a polygonal head of said pinion in zloclged engagement against turning.

6. In a device for securing, adjusting and 1de,- Ytaching a pair of ,housingshaving complementary .engageable threaded members, an `internal gear carried by one of said housings, a single .m-11ually rotatable pinion extending inwardly from the exterior through said housingand 4engaging said internal gear to rotate vthe latter ineither direc,- tion to .move saidzhousinginto or outof theot'ner Vhousing automatic lookingmeans resilientlyurged `to vnormally lock said pinion in any adjusted lpositionsaid'locking means comprising a `pOlvg.-

.onally .aperture plate and resilient means ,for .normally urging .said plate upwardly toengage a .polygonal head of said pinion and manually compressible .to .unlock said pinion so that vthe latter is free to be rotated .in either direction. RICHARD SEARS.

REFERENCES CITED The following references oi record Vin the file of this patent:

UNITED STATES PATENTS Number Name ADate ,413,569 Sherman Oct.. Y22, 1889 6.4.0;849 Wade V ,Jan.v9, 1900 1,191,893 Harriman July 18, ,-1.916 .1,194,236 Richards Aug. 8, `1916 1,459,025 Hutchins June 19, 192-3 1,459,578 Densmore ,June 1,91923 .FOREIGNPATENIS Number Country Date .6,144 Great Britain Oct. 24, 1912 524,940 Great Britain Aug. 19, 9,40