US2940364A - Base plate for mortars and the like - Google Patents

Base plate for mortars and the like Download PDF

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Publication number
US2940364A
US2940364A US672476A US67247657A US2940364A US 2940364 A US2940364 A US 2940364A US 672476 A US672476 A US 672476A US 67247657 A US67247657 A US 67247657A US 2940364 A US2940364 A US 2940364A
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US
United States
Prior art keywords
base plate
ground
panel
fins
walls
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US672476A
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English (en)
Inventor
Jasse Joseph Raymond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hotchkiss Brandt SA
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Hotchkiss Brandt SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hotchkiss Brandt SA filed Critical Hotchkiss Brandt SA
Application granted granted Critical
Publication of US2940364A publication Critical patent/US2940364A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A23/00—Gun mountings, e.g. on vehicles; Disposition of guns on vehicles
    • F41A23/52—Base plates for gun mountings
    • F41A23/54—Base plates for gun mountings for mortars

Definitions

  • the present invention relates to base plates for mortars or like firing devices adapted to be anchored in the ground for receiving the thrust of the tube of the firing device when firing.
  • the object of the invention is to provide a base plate which is simple in construction, particularly convenient to use and permits obtaining a remarkable stabilization of the firing device after the first shots, this plate being easy to extract from the ground after firing.
  • This base plate comprises in combination: a flat panel provided at its centre with a cup or other device adapted to receive the rear end of the firing device, and, protruding from the lower face of this panel, on one hand, fins perpendicular to the panel the lower edges of these fins forming ground-penetrating points and, on the other hand, inclined curved walls forming arches which are symmetrical in pairs so as to constitute supporting wedges in the ground, said walls being upwardly divergent and higher than said lower edges of said fins.
  • the base plate Owing to this construction as soon as the first shots are fired, the base plate is driven into the ground a certain distance very rapidly along the parts of the fins which protrude downwardly relative to the curved walls, the latter then progressively bear against the ground and damp or brake from that moment on the speed at which the base plate is driven into the ground while providing the base plate with a very large ground-contacting surface.
  • Fig. 1 is a vertical axial sectional view of a base plate embodying the invention taken along line 11 of Fig. 2;
  • Fig. 2 is a plan view thereof
  • Fig. 3 is a side view corresponding to Fig. 1;
  • Fig. 4 is a view of the underside of the base plate
  • Fig. 5 is a vertical sectional view taken along line 5-5 of Fig. 1;
  • Fig. 6 is a perspective view from above, and
  • Fig. 7 is a perspective view from below.
  • the base plate comprises a flat panel 1 in the form of a three-branched star, for example composed of weldable steel plate.
  • this panel has at its centre a rein-forced part 2, for example attached by welding, in which an upper recess 3 is formed, this recess being part-spheri cal in shape the centre 0 of which is situated in the im- 2,949,364 Patented June 14, 1960 mediate vicinity and preferably slightly above the upper face of-the panel 1.
  • the branches of the star-shaped panel 1 could have a constant thickness or, as is shown in Fig. l, a thickness tapering from the part 2 toward the ends 4 of the branches (Figs. 1 and 6). These branches have lateral parallel edges interconnected by large-radius arcuate edges 5 (Figs. 2 and 6).
  • each fin is disposed in a radial plane which is the median plane of one of the branches of the panel 1.
  • the fins 6 are furthermore interconnected by a conical wall 8 which terminates at its base in a conical end member 9 the point of which is directed downwardly.
  • the lower edges 11 of the fins are parallel with the panel 1 in their portion in the vicinity of the centre of the; base plate but these edges progressively curve downwardly at 12 and terminate in a peripheral point 13 which: constitutes one of the three bearing points of the base: plate the most distant from the panel 1 in the down-- ward direction.
  • the central point 9 is distinctly nearer:
  • Each point 13 pertaining to one of the fins is reinforced by a peripheral spade 14 and by two gusset plates.
  • these spades 14 consists of a triangular plate which extends a certaim distance beyond the panel 1 and terminates in an upper large base 14* which is rectilinear in the presently-described embodimentr
  • these spades 14 are slightly oblique and downwardly diverge relative to the axis XX.
  • the fins 6 are each combined with a pair of inclined curved walls in the form of arch portions 16-17, Ili -17 and 16 17
  • the two walls of each pair are connected at their lower edges to the corresponding fin along two lines 18 on opposite sides of this fin. These lines 18 are parallel with the panel 1 and are closer to the latter than the lower edges 11 of the fins.
  • each pair upwardly diverge symmetrically relative to the corresponding fin 6, that is relative to an axial radial plane containing the axis XX, and extend beyond the panel 1 and terminate in a curved upper edge 19which is preferably reinforced.
  • These walls are part-conical and do not require to be pressed out when being put into shape, this shaping being obtained by a simple rolling operation.
  • the angle of inclination of each of these wallsrelative to a plane parallel with the panel 1 progressively decreases from a value a at the level of the line 18, to a value b at the level of the panel, to a value c at the upper end 19 of the wall.
  • the curved walls forming arches pertaining to the various fins 6, are interconnected in pairs along lines 211 situated in axial radial plans and these lines, owing to a suitable shape of said walls, could be rectilinear as seen on the right side of Fig. l, and in Figs. 4, 6 and 7.
  • the total area of the anchoring surfaces normal or substantially normal to the panel 1 (the parts of the fins 6 situated below the lines 18 and the spades 14) only represent a relatively small fraction (20 to of the total anchoring surface.
  • the plate is completed by arcuate handles 22, for example one handle for each spaced 14, these handles being fixed to the latter at their ends.
  • the base plate of the invention is used in the following manner:
  • the base plate When the firing position has been selected, the base plate is placed directly on the ground on its three points 13 and the breach of the firing device is engaged by its rear swivel bearing in the part-spherical recess 3 on which the firing device is pivotable for adjusting the firing direction and elevation. As soon as the first shot has been fired, the reaction of the firing device exerts on the base plate a downward thrust through the centre of the recess 3 and, as a result of this thrust, the base plate is driven into the ground firstly at its points 13 and thereafter along the lower portions of the fins 6 and the spades 14.
  • the ground as it offers a resistance which is the greater as the angles a, b, c are smaller, does not cause the base plate to be displaced laterally, and the stability of'this base plate as concerns its positionat a given point in the ground is practically perfect.
  • the base plate of the invention has other important shots.
  • walls 16''17 16 17 form with the fiat panel a strong box-like structure in the form of a starwhich transmits to said walls, which form arches and bear against the ground, the initial percussion of the successive It is very easy to extract from the ground compared with most of known base plates.
  • the slopes due to the anglesa' to c are such that the ground does not adhere to the. base plate and the. latter never needs cleaning. 7
  • a base plate for a mortar or like firing device comprising: a flat panel including a substantially central'portion, vertical fins depending from said panel and extending radially fro-m said central portion, said fins including pointed portions extending downwardly and spaced from said central portion, and a pair of curvedwalls operatively engaged with said panel and extending along and converging towards a respective one of saidfins to engage therewith at a position spaced from the bottom of said one fin, said walls being curved in a cross-section normal to the radial extent of said one fin, said walls diverging upwardly for braking the displacement of the plate into the ground after the fins have entered the ground by engaging the ground with increasing amounts of surface area.
  • a base plate as claimed in claim 1 comprising spades at the peripheral ends of the fins, said spades being interconnected by the peripheral ends of adjacent pairs of said walls.
  • A, base plate as claimed in claim 4 comprising peripheral gusset plates providing a reinforced connection between said spades, fins and walls.
  • a base plate as claimed in claim 1 comprising a pointed member depending downwardly from the center of said panel and interconnecting the fins.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Finishing Walls (AREA)
  • Joining Of Building Structures In Genera (AREA)
US672476A 1956-07-18 1957-07-17 Base plate for mortars and the like Expired - Lifetime US2940364A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1086592X 1956-07-18

Publications (1)

Publication Number Publication Date
US2940364A true US2940364A (en) 1960-06-14

Family

ID=9612862

Family Applications (1)

Application Number Title Priority Date Filing Date
US672476A Expired - Lifetime US2940364A (en) 1956-07-18 1957-07-17 Base plate for mortars and the like

Country Status (5)

Country Link
US (1) US2940364A (en(2012))
BE (1) BE559084A (en(2012))
CH (1) CH339832A (en(2012))
DE (1) DE1086592B (en(2012))
FR (1) FR1156432A (en(2012))

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010049002B3 (de) * 2010-10-21 2012-01-12 Bundesamt für Wehrtechnik und Beschaffung Verfahren zur Erhöhung der Treffwahrscheinlichkeit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR816093A (fr) * 1936-04-06 1937-07-29 Plateforme pour pièces d'artillerie
US2557960A (en) * 1946-04-15 1951-06-26 William R Gerhardt Base plate for mortars
US2694342A (en) * 1948-08-04 1954-11-16 Brandt Edgar Ets Base-plate device for mortars and other guns

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT79175B (de) * 1918-07-17 1919-11-25 Edwin Storek Granatwerfer.
DE611540C (de) * 1931-03-21 1935-03-30 Emil Hene Dr Ing Verfahren zur Herstellung von Cyannatrium
US2046518A (en) * 1935-05-25 1936-07-07 American Armament Corp Separable gun mount
NL56198C (en(2012)) * 1936-04-20
BE425482A (en(2012)) * 1936-12-31
BE425481A (en(2012)) * 1937-01-04
CH194788A (de) * 1937-04-08 1937-12-31 Mueller Albrecht Bettungsplatte für leichte Minenwerfer.
BE490274A (en(2012)) * 1949-07-04 Brandt Edgar Ets
US2765707A (en) * 1953-05-12 1956-10-09 Soltam Ltd Base plate of grenade mortar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR816093A (fr) * 1936-04-06 1937-07-29 Plateforme pour pièces d'artillerie
US2557960A (en) * 1946-04-15 1951-06-26 William R Gerhardt Base plate for mortars
US2694342A (en) * 1948-08-04 1954-11-16 Brandt Edgar Ets Base-plate device for mortars and other guns

Also Published As

Publication number Publication date
CH339832A (fr) 1959-07-15
DE1086592B (de) 1960-08-04
FR1156432A (fr) 1958-05-16
BE559084A (en(2012))

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