Screw off baseplate

Abstract

A rear slip base plate for a round carrying a guidance and control unit payload, which round is launched from a rifled launch tube. To prevent the guidance and control unit payload from also being rapidly spun with the round, the slip base plate unit mechanically isolates the guidance and control unit payload from the round spin rate.

Claims

1. A round (300) for launching a guidance and control system which is degraded by rotational motion, said round having a main longitudinal axis (63), said guidance and control system being located within a forward saboted carrier housing (2) which has outer facing vanes (51) thereon and wherein said round is launched through a rifled launching tube, said forward saboted carrier housing (2) being located together with a rear screw off baseplate unit (102), together as an assembly (100) in said round, and wherein said forward saboted carrier housing has attached thereon a one piece composite stem (61) having stem first part (43) which is sized to fit into a cavity (52), and a stem second part (4), and a stem third part (48) being a rearward facing square cross sectioned element which mates into a circular disk shaped plate (3) that is attached rearwardly behind said forward saboted carrier housing by means of a square cross sectional passage (49) which is sized to mate to stem third part (48), and wherein the forward saboted carrier further has thread grooves (44) therein and the stem second part (4) has threads (45) thereon which are sized to engage the thread grooves (44) to unscrew said composite stem (61) backing it away (305) from said forward saboted carrier when said composite stem (61) is turned clockwise (304) looking from the rear, and wherein said circular disk shaped plate (3) has thereon a rotating band element (1) attached in a groove (50) of the circular disk shaped plate (3) and wherein circular disk shaped plate (3) is free to rotate independently of the forward saboted carrier (2) if turned clockwise looking from the rear, and there further is an annular shaped ball bearing friction pad (5) located between the forward saboted carrier (2) and circular disk shaped plate (3), and wherein composite stem (61) in pre-launch position is fully screwed in place so that stem first part (43) rests completely flush against a front line (62) in the cavity (52), whereupon, during launch circular disk shaped plate (3) is rotated clockwise looking from the rear, through the rotating band element (1) being engaged in rifle grooving of the launching tube, and thereupon circular disk shaped plate (3), the rotating band (1) and the composite stem (61) are all unscrewed and separated from the forward saboted carrier (2) into a direction (305), whereupon the forward saboted carrier (2) experiences reduced rotational spin than does circular disk shaped plate (3) during forward (307) launching of the assembly (100) within said round as a result of unscrewing action causing reduced rotational spin of said forward saboted carrier (2).

2. The round of claim 1 wherein there are three screw threads on threads (44), and thread grooves (45).

3. The round of claim 1 wherein said round (300) has a nose (306), an enclosing case (301) with a front (302) thereon, and a rear location (303) to where the assembly (100) is connected, and wherein the round is launched forwardly in direction (307) and spins clockwise (304) as a result of rotating band element (1) engaging rifling in the launching tube.

4. The round of claim 3 further having a member (308) having a hole (310) sized to engage the stem first part (43) in launch position whereupon, as a result of launch, unscrewing of the composite stem (61) releases a multi-piece member (308) which in turn releases petals in lateral directions (309) of enclosing case (301) freeing the forward saboted carrier (2) either with or without the nose (306) into its flight.

Description

LIST OF DRAWINGS

(1) FIG. 1 shows a cross sectional view of a slip baseplate system with a carrier 2 payload, in accordance with this invention.

(2) FIG. 2 illustrates a rear end view of the slip baseplate system of FIG. 1, in accordance with this invention.

(3) FIG. 3 shows a cross sectional view of launching round 300, implementing a slip baseplate system during a launching cycle, in accordance with this invention.

(4) FIG. 4 illustrates scenario 400 which shows the effect of an unscrewed slip baseplate cross sectionally during the firing of round 300 of FIG. 3, in accordance with this invention.

DETAILED DESCRIPTION

(5) FIGS. 1-4 show a rear slip base plate for a round carrying a guidance and control unit payload, which round is launched from a rifled launch tube. To prevent the guidance and control unit payload from also being rapidly spun with the round, the slip base plate unit mechanically isolates the guidance and control unit payload from the round spin rate. FIG. 3 shows a cross section of a round 300 for launching a guidance and control system (GCS) which GCS is degraded by rotational motion. The round has a main longitudinal axis 63; the guidance and control system is located within a forward saboted carrier housing 2 which has outer facing vanes 51 thereon. The saboted carrier housing 2 is located together with a rear screw off baseplate unit 102, together as an assembly 100 in the round. The carrier housing has screwed therein a one piece composite stem 61. Composite stem comprises stem first part 43 which is sized to fit into cavity 52, and a stem second part 4, and a stem third part 48 being a rearward facing square cross sectioned element. The square element mates into a circular disc shaped plate 3 that is attached rearwardly behind the carrier housing by means of a square cross sectional passage 49 which is sized to mate to stem third part 48. The carrier 2 further has thread grooves 44 therein and the stem second part 4 has threads 45 thereon which are sized to engage the thread grooves 44 in carrier 2 to be able to unscrew said composite stem. The composite stem backs away from the carrier in direction 305 when the composite stem 61 is turned clockwise in direction 304 looking from the rear. Plate 3 has a rotating band element 1 thereon, attached in a groove 50. The plate is free to rotate independently of carrier 2 if turned clockwise looking from the rear. There further is an annular shaped ball bearing friction pad 5 located between carrier 2 and plate 3. In pre-launch position the composite stem 61 is fully screwed in place so that stem first part 43 rests completely flush against the front at line 62, in cavity 52. During launch, plate 3 is rotated clockwise looking from the rear, through rotating band element 1 being engaged in rifle grooving found in its launching tube (not completely shown), and thereupon plate 3, rotating band 1 and the composite stem 61 are all unscrewed and separated from carrier 2 into direction 305. After such separation, carrier 2 is free to experience reduced rotational spin than does plate 3 during forward direction 307 launching of assembly 100 within said round. This is as a result of unscrewing action causing reduced rotational spin of said carrier 2. There may be three screw threads on threads 44, and thread grooves 45, for one carrier embodiment, for instance. The round 300 has a nose 306, an enclosing case 301 with a front 302 thereon, and a rear location 303 to where assembly 100 is connected, and wherein the round is launched forwardly in direction 307 and spins clockwise 304 as a result of rotating band element 1 engaging rifling in its launching tube. The round of claim 3 further has a multi-piece member 308 (not completely shown) having a hole 310 sized to engage stem first part 43 during pre-launch position. As a result of launch, an unscrewing of the composite stem 61 releases multi-piece member 308; this in turn releases petals in directions 309 of casing 301 freeing the carrier 2 with/without nose 306 into its flight. The multi-piece member 308 is not completely shown here, but it has separate parts that may pull out laterally from the carrier 2 after composite stem 61 unscrews from hole 310, and therefore no longer keeps the multi-piece member 308 in place. The multi-piece member would thereafter not be able to retain the petals in place since the petals are attached at distal ends of such multi-piece member.

(6) While the invention may have been described with reference to certain embodiments, numerous changes, alterations and modifications to the described embodiments are possible without departing from the spirit and scope of the invention as defined in the appended claims, and equivalents thereof.