US1630532A - Machine-gun unit - Google Patents

Description

May 31,1927.

,r. M. JERVEY MACHINE GUN UN`I-T Filed Jan.. 1s. 192s `2 Sheets-Sheet 1 May-5311531521 A'l'. M. JERVEY MAHINE GUN UNH Fim Jan. 1s. 1926 2 sheets-snaai l y 'N-lumai M degltg @ttm nui Patented May 31, 1927.

ai 2;. rags THOMAS lvr; Jammin, on 'ann Unrrnnsrarns ARMY, ABER-nnen PRVING- GROUND,

.MARYLAND Y MACHINE-GUN UNIT.'

Application. aiedfiaauary 1a, 19265 seriain'o. 815079.y

(snai-irannnnaarns ACT or rllhe inv-ention described hereinA may be nscd. by the Government, or any of its oiiicers or employees in prosecutionor workrror the Government,or by any other person'in the 'United' States, ,vithcaitv payment to Ime of` any royalty thereon, in accordance with the act ot March 3, 1883; i

rlhis invention relates to, a machine gun unit and in 'particular it has'reference to a sear release mechanism applicable for synchronized guns mountedfon aircraft.

The principal object of this invention is to provide a sear release mechanism for machine guns of the above specifiedl type 1n which a lever is utilized to release the scar, and this lever is so mounted as tol operate thesea-r more easily than, existing types yof releases while" at the i same ytime supplementing the action of the'sear spring by normally tending to hold the sear'engaged, thereby increasing the positive locking action of the sear and insuring semi-automatic operation of the gun. L

To these and other ends, my invention consists in the construction, arrangement, and combination oi' elements,'described hereinafter-'and pointed out inthe claims forming-a." part of this specification. n

A practical' embodiment ofmy invention is illustrated in the accompanying drawings, wherein: Y n Y Fig. 1 is a transverse sectional view through a machine gun showing, in rear'ele-y vation, a bolt providedl with a searmechanism constructed in accordance with the i'n-v vention;

Fig; 2l is a sectional view through the bolt on. the line 2-2 of Fig l;v

Fig. 3 is a longitudinal sectional view through the bolt;

Fig. 4 is a view in front elevation of the assembled seal" and sear release mechanism;

Figs. 5, 6, 7 and 8 are detail views of the lever;

Figs. 9, 10, 11 and 12 are detail views of the Sear;

Figs. 13 and 14 are ldetail views of the sear lever slide.

Referring to the drawings by numerals of reference:

There is shown at 5 the side plates of a machine gun between which reciprocates the bolt G carrying the firing pin 7 which is cocked in a well `Known manner by the lever MARCH 3,1833; 22' saar.' L. 62751.).

8. The. pin isheld in cocked position byv a Sear 9V slid'able vertically -inlslots 6 cut' Iin Athe rear tace orthe bolt andi forced to ypin- Yengagint'g,position by,YV a, spring 10. i

The sejar is operate'dto release lthe tiring pin by meansv of a transversely swinging lever 11 whose connection 'with the sear 1s' preferably made by a slide 12 disposed in agroove 1'1 in the lever and' having a cylindrical projection or stud 12 receivable in'an apenture 9" inthe sear. The llever'S Substantially inthepform of; quadrant and in its normal? position ot restv ,whenfconnected to lthe sear it is-out of' equilibrium, its ulcruln 13 being' located at one side ofthe vbolt so as to liejabove andto'one side otthecentefr of .gravity of the lever andfthereby normally produce a force' acting -olithereturIlStiioke supplementing the sea-rspring, for moving and holding the sear 1n iringpinengalgement'.

of the lever or whenf the lever is at rest, and .Y Y

s In order that the movement of'the,lever may be transmitted to the sear with asllittle eitort as' possible, thefposition4 of the groove 11 during' operation, is substantially along theV horizontal planeV so vas to,v reduce to` Ya minimumjthey resistance encountered in lifting' the sear and furthermore the slide works 'in the' outer-po'rtionofk the grooveV to obtain a long lever arm. By thus converting1 circu 'it willY supplement the ,action of the Sear spring in' preventing disengagement of the sear.

The lower circumferential portion of the lever is reduced as at 14 for disposition in a slot or groove 15 in the bolt to prevent withdrawal of the lever after being assembled in the gun. A conventional trigger motor includes the usual plunger 16 and a pa-wl 17 for rocking the lever and operates in a well known manner to synchronize the action of the gun and the airplane propeller. y

While in the foregoing there has been illustrated and described such combination and arrangement of elements, as constitute the preferred embodiment of my invention,

llarv intoV reciprocal motion. the force required Y to operate the sear will be 'considerably` less Y it is Ynevertheless desired to emphasize the fact that intermetation ot the invention should only be conclusivewvhen made inthe lightol the subjoinedclaims.

I claim:

l. In a machinegun unit, a reciprocal breech bolt, aiiring pin carried thereby and movable with respect thereto, a cooking lever for the pin, a centrally located scar, having an aperture, for holding the pin in cocked position, a. lever ot substantially quadrant 'form tulcrumed at one side of the bolt so a's to place the leverin unstable equilibrium,

'said' lever formed with agroove positioned during operation of the lever "approximately 1n the horlzontal plane, and a slide .member dis osed in the Orooveand havingY a. ro'ectv C h l in@r stud receivable in the aperture of the sear.

2. Ina m chine gun unit. a reciprocal breech bolt,l a fringpin carried thereby and movable with respect thereto, a cooking lever tor the pin, a centrally located sear, having an aperture, tor holding Vthe pin in cocked position, af lever fulcrumed at one sidepof'the bolt and swinging acrossthefcenterv of the bolt, said lever formed witha groove posi- 'tioned during operation of the lever approXimately in the horizontal plane, and a slide member disposedin the groove and having a vprojecting stud receivable in the aperture of the scar.

` 8. In a'I machine gun unit, a. reciprocal kbreech bolt, afirmg pm carried thereby and vmovable With respect thereto, a cooking lever for the pin, a centrally located Sear, having an aperture, Vfor holdingthe pin in cocked position, a leverfulcrumed at one side' of the vcoimectiou' bretweenthe lever and thc scar whereby they move in unison. y

5.7111 a. machine gun unit, a reciprocal u Y breech bolt, a1 firing pin carried: thereby and mmovable With respect thereto, means 'tor cockl ing the pin, a sliding seal' f'lior holding the pinin cocked position, a scar spring, a lever ulcrumedj on the bolt, and a connection between the lever andthe scar whereby they move in unison. Y

6. In aV machine gun unit, a reciprocal breech bolt, a firing pin carried thereby and movable with respect thereto, means for cocking thev pin, a, sliding scar 'tor-holding the pinin cocked position, a sear spring VJfor moving the sear to engage the pin, and means svvingable transversely of the bolt for disengagingthe sear, the normalposition ot sa'id means being out of equilibrium so as to sup plement the actionof the Sear spring.' f

7. In a machine Ygun unit, a reciprocal breechboln a firing pin carried thereby and movable with respect thereto, means for cocking the pin, aA sliding sea'r for holding the pin in cocked positiom'a sear spring for moving the Sear to engage the pin, and means swingable transversely of the bolt for disen-l gaging the sear. f v

Y 8.'V In a machine gun,v a reciprocal breech bolt, a firing! pin carried thereby and movable With respect thereto, means for cockingthe pin, a. sliding sear for holding'the pin'in cocked position, and sear actuating means mounted on the bolt for swinging movement.

`9. In a machine gun, a reciprocal breech bort, a tiring pm carried thereby and movable With respect thereto, means for cocking the Vpin,a sliding sear for holding the pin in cocked positiomand swinging means connected tothe sear, the upward stroke olf said means disengaging the sear and the downward stroke moving the sear into firing pin engagement.V

10. The combination with a sear, of a lever fulcrumed adjacent the sear and swingable across the path'ot travel of the scar, and a sliding connection between the Vlever and scar. K l' Y THOMAS M. J ERVE Y.

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