Патент USA US2108060код для вставки
Feb. 15, 1938. '5, @_ GREEN 2,108,060V BACK PLATE LATCH FOR MACHINE GUNS Filed DeC. 9, .1936 a n E E( _` E 6 ` Inventur* Samuel E_Er‘ean refeptedreb. is, 193e' ' _ „2,108,060 UNITED Ís-TA'yras PATENT. CF1-‘ICE 2,108,060 , >BACK PLATE LATCH Fon MACHINE GUNS ' _ I ¿ A Samuel G. Green, Gray, Ga.. Application December-9,1936, serial Np. 114,972 ' ` s Claims.- (orso-_1) (Granted under the _per of March s, 1883, as amended April 3o, 192s; 33o o. 6.157); bar is‘fspaced from the. lower end 'of the _back 'I'he invention described herein may be manu factured and used by or for the Government for plate ~which has 'a centrally positioned slot 20 _ « governmental purposes, without >the payment to - for receiving and pivotally mounting the foot of _ me of any royalty thereon. ' 5 ' a late_h 2 I. A nose 22 on the latch is adapted to . This invention relates to. a back plate latch for machine guns. - engage» under the rear end _of the bottom Aplate and-the latch is normally'held in latching posi _ 'I'he purpose of this invention is to provide a back plate for the receiver of a machine gun in which a latch -is conveniently mounted in the lower end of -the plate and in order-_that the tion by a. helical spring 23 which is seated‘in a recess in the under side of the bar I 6 and in a well 24 formed in the body of the'latch. A toe 25 on the foot of the latch is adapted to engage the latch may not be accidentally disengaged from ' `back plate and limit movement of the latch _the receiver a locking member is mounted onv the under influence of the spring when the back plate` back plate and is arranged to normally hold th is out of -i_ts ;ñna1 assembled'position or is de-' latch in latching position. ‘ vtached from the gun. -To these and other ends, theinvention consists in the construction,-arrangement and combina The latch is held in engagement with the' bot 15 tom plate of the receiver by means of a locking tion of elements described hereinafter and point- f.. member 26 which is -arranged to move in a plane ed out in the claims forming a part of this speci transversely- of the plane of movement _of the ñcation. ' ‘ latch.. Thev locking member is channeled to ,em-` „Q_ A practical embodiment ofthe invention is il'-_ brace the bar I6 and it is mounted at its right lustrated inthe accompanying drawing, wherein: end on a .pivot pin 21 passing through vthe bai’ Fig. 1 is a plan view of ‘the breech end of I6. A spring 28 bearing on the bar and anchored in the locking member normally holds said mem b'er against the bar in which position its lower'. a machine gun. Fig.- 2 is a view in lrear elevation. Fig. 3 is a sectional view on theline 3-3 of Fig. 2. - side engages the shoulder_29 of the latch. 'I'he lower- _side of the locking member is formed with . ._ Fig. 4 is a sectional view- on the line 3-3 _of _ a cut-away portion 30 to avoid interference with Fig. 3? 7 . the'helical spring 23. - . In operation the locking member must iìrstbe. moved out _of engagement with the latch before Ú 30 ' Fig. 5. the latch can be movedout of engagement with Fig. '7 is a view in rear elevation and partly in the bottom plate. As clearly shown in Fig. 2 both section showing the application of the latch to the latch and locking member may be conveni Fig. 5 isa plan view of the locking member. Fig. 6 is a sectional view-on the line 6_-6 of r, another type of back plate. ' Fig. 8 is a sectional view on the line 8-8 oi l ently grasped by the thumb and foreñnger. Fig. 7. Referring to -Figs. 1 to 6 there is ‘shown a ma-. chine gun ofthe Browning type comprising a back plate 3| is of a type particularly designed . In the modification shown in Figs. 'l' and 8 the for a. iixed gun and is not provided with a trigger and handle grips while 'the buiïer 32 is arranged vertically in the back plate. 'I‘he latch 33 is sub receiver formed of side plates 5 and 6, a bottom 40 plate 1 and' a top plate 8. The innerwalls of the side plates 5 andy 6 are formed' adjacent their rear ends with vertically disposed grooves, respec stantially identical with the latch 2I and is ar- ' ranged in a similar manner. lvA locking member 34, vertically disposed in a slot 35 _in the backv plate, is pivotally mounted` to move transversely tively 9 and I0, for >receiving opposite tongues II-'II on _a back plate I2 which is assembled-by of the back plate and in a plane transversely oi' the plane of .movement of the latch. A toe 36 45 a downward movement vand supported by_ the bottom plate 1. The back plate carries a trig ger I3 and a buiïer lI4 which is disposed longi tudinally of the gun and serves in a Well known 45 on the lower end of the locking member is nor mally in engagement with the latch 33 to hold _ the latter in latching position and the locking manner to limit recoil movement of the breech , member is maintained in this position by a spring 50 bolt (not shown). _' An upper bar 'I5 and a lower bar I6 on the back plate carry a pair of hand grips vI_1-I1.4 , ’31.` ._ ~ ' . cSo long as the latch is engaged by Ithe locking ’ member the 'latch cannot be accidentally dis 'I'he >lower bar I B is‘mounted in .two laterally "engaged as might occur when the breech end of spaced sets of vertically spaced ears I8-I8 and the gun-is depressed and an obstruction such as _ 55 secured thereto by bolts or rivets I9. The lower the knee of the gunner is struck b_y the latch, 55 ' 2 2,108,0_60 I claim: - 1. In a machine gun, a receiver, a back plate slidably mounted in- the receiver by a lowering ' movement, a bar onf the lower part of the back receiver to hold the‘back plate in place, a spring between _the bar and latch, a locking member pivotally mounted on the bar and movable in a plane transversely of the piane of movement of the latch, and a. spring normally holding the plate, a latch pivottally carried by _the back plate underneath the bar and arranged to engage the locking member in engagement with the latch. receiver to hold the back plate in place, a spring. 3. In a machine gun, ia receiver,` a back-I plate between the bar and latch, a channeled locking slidably mounted in the receiver by a lowering 'member pivotallyf mounted on the b'ar and mov movement, a latch carried in the lower part of the back plate and arranged to engage the re 10 10 a‘ble in a plane transversely of the plane of move ment of the latch,'and a spring normally holding ceiver to hold the back plate in place, and a lock the locking membler in embracing relation with ing member carried by the back plate and mov the bar and in engagement with the latch. able in a .plane transversely of the plane of 2. In a machine gun, a receiver, a back plate movement of the latch to engage the latch, said 15 slidably mounted yin the receiver by’a lowering latch and locking member mounted for move 15 movement, a bar on the lower part of the back ment towards each other on being disengaged. plate, a latch pivotally carried by the back plate ~underneath the bar and arranged to engage the i SAMUEL G. GREEN.