Handle operated heavy duty draw latch with safety catch

In a toggle type draw latch assembly having a base, having an elongate operating handle that is pivotally connected by means of a first pivot pin to the base near one end region of the handle for permitting movement of the handle relative to the base about a first pivot axis of the first pivot pin between a fully open position wherein a portion of the handle is extended relative to the base and a fully closed position wherein the handle portion is situated relatively near to the base, having a hand grip formed near the opposite end region thereof, having a drawbar pivotally connected to the handle at a location that is nearer to the end region of the handle than to the hand grip, with the drawbar being pivotally movable relative to the handle about a second pivot axis between an extended position and a retracted position wherein a portion of the drawbar is situated relatively near to the hand grip, the improvement comprising:

• a) the base being formed as an assembly of a substantially L-shaped member and a substantially U-shaped member;
• b) the L-shaped member having a substantially flat mounting leg that is joined by a substantially right angle bend to a substantially flat end leg that has a length measured from the right angle bend that is less than is the length of the mounting leg measured from the right angle bend, with the mounting leg and the end leg each having front and rear portions that are located on opposite sides of a common imaginary center plane that intersects substantially at right angles the mounting leg and the end leg along imaginary center lines that extend substantially centrally with respect to the mounting leg and the end leg, respectively;
• c) the U-shaped member having a pair of substantially flat, similarly configured, front and rear legs that are rigidly connected by substantially right angle bends to a substantially flat base leg, with the front and rear legs:
• 1) being oriented to extend in spaced, substantially parallel relationship so as to overlie each other;
• 2) having end surfaces that overlie each other and that extend substantially perpendicular to the substantially flat base leg;
• 3) having aligned holes formed therethrough that are of a size that will closely receive the first pivot pin;
• d) first connecting means for rigidly connecting the U-shaped member to the L-shaped member 1) such that the front and rear legs of the U-shaped member are positioned to extend in substantially parallel planes on opposed front and rear sides of, and at substantially equal distances from said imaginary center plane, 2) such that the base leg of the U-shaped member engages a selected one of the mounting leg and the end leg of the L-shaped member, and 3) such that the overlying end surfaces of the front and rear legs of the U-shaped member engage the other of the mounting leg and the end leg of the L-shaped member;
• e) the handle being formed as an assembly that includes:
• 1) a pair of elongate front and rear handle members that extend in overlying relationship from A) overlying first end regions of the front and rear handle members that have aligned holes formed therethrough that are of a size that will closely receive the first pivot pin, and B) overlying second end regions of the front and rear handle members are similarly configured and cooperate to define a handgrip;
• and,
• 2) stop formation means defined by overlying, similarly configured formations of the front and rear handle members for cooperatively defining a stop that engages a selected one of the mounting leg and the end leg of the L-shaped base member when the handle is in a selected one of its fully open and fully closed positions;
• f) means for adjusting the effective length of the drawbar within a given range of adjustment, with such adjustment affecting the nearness of the drawbar to the hand grip when the drawbar is in its retracted position;
• g) auxiliary stop formation means for defining drawbar engaging surface means at a location near the hand grip for being engaged by the drawbar when the drawbar is in its retracted position, with the auxiliary stop formation means also being connected to the handle;
• h) with the drawbar engaging surface means including a surface that extends for a sufficient distance along the length of the handle at said location near the hand grip for being engaged by the drawbar when the drawbar is in its retracted position regardless of where within said given range of adjustment the means for adjusting the effective length of the drawbar is set;
• and,
• i) with the drawbar engaging surface being configured to ensure that the retracted position of the drawbar is held at a sufficiently far distance away from the location of the hand grip to ensure that, regardless of where within said given range of adjustment the means for adjusting the effective length of the drawbar is set, the retracted drawbar will not so closely approach the hand grip as to endanger portions of a hand that is gripping the hand grip being contacted by the retracted drawbar.

In a toggle type draw latch assembly having a base, having an elongate operating handle that is pivotally connected by means of a first pivot pin to the base near one end region of the handle for permitting movement of the handle relative to the base about a first pivot axis of the first pivot pin between a fully open position wherein a portion of the handle is extended relative to the base and a fully closed position wherein the handle portion is situated relatively near to the base, having a hand grip formed near the opposite end region thereof, having a drawbar pivotally connected to the handle at a location that is nearer to the one end region of the handle than to the hand grip, with the drawbar being pivotally movable relative to the handle about a second pivot axis between an extended position and a retracted position wherein a portion of the drawbar is situated relatively near to the hand grip, the improvement comprising:

• a) the base being formed as an assembly of a substantially L-shaped member and a substantially U-shaped member;
• b) the L-shaped member having a substantially flat mounting leg that is joined by a substantially right angle bend to a substantially flat end leg that has a length measured from the right angle bend that is less than is the length of the mounting leg measured from the right angle bend, with the mounting leg and the end leg each having front and rear portions that are located on opposite sides of a common imaginary center plane that intersects substantially at right angles the mounting leg and the end leg along imaginary center lines that extend substantially centrally with respect to the mounting leg and the end leg, respectively;
• c) the U-shaped member having a pair of substantially flat, similarly configured, front and rear legs that are rigidly connected by substantially right angle bends to a substantially flat base leg, with the front and rear legs:
• 1) being oriented to extend in spaced, substantially parallel relationship so as to overlie each other;
• 2) having end surfaces that overlie each other and that extend substantially perpendicular to the substantially flat base leg;
• 3) having aligned holes formed therethrough that are of a size that will closely receive the first pivot pin;
• d) first connecting means for rigidly connecting the U-shaped member to the L-shaped member 1) such that the front and rear legs of the U-shaped member are positioned to extend in substantially parallel planes on opposed front and rear sides of, and at substantially equal distances from said imaginary center plane, 2) such that the base leg of the U-shaped member engages a selected one of the mounting leg and the end leg of the L-shaped member, and 3) such that the overlying end surfaces of the front and rear legs of the U-shaped member engage the other of the mounting leg and the end leg of the L-shaped member;
• e) the handle being formed as an assembly that includes:
• 1) a pair of elongate front and rear handle members that extend in overlying relationship from A) overlying first end regions of the front and rear handle members that have aligned holes formed therethrough that are of a size that will closely receive the first pivot pin, and B) overlying second end regions of the front and rear handle members are similarly configured and cooperate to define a handgrip;
• and,
• 2) stop formation means defined by overlying, similarly configured formations of the front and rear handle members for cooperatively defining a stop that engages a selected one of the mounting leg and the end leg of the L-shaped base member when the handle is in a selected one of its fully open and fully closed positions;
• f) drawbar biasing means for biasing the drawbar to pivot toward its retracted position relative to the handle;
• g) wherein 1) the front and rear handle members are spaced apart at a chosen location situated between the location of the handgrip and the location of the aligned holes, 2) aligned circular openings are formed through the spaced front and rear handle members at said chosen location, 3) an elongate second pivot pin extends through and is closely received within the aligned circular openings so as to be pivotally connected to the handle for movement relative to the handle about an imaginary second pivot axis that extends centrally along the length of the second pivot pin, 4) the drawbar is connected to opposite end regions of the second pivot pin for pivotal movement therewith relative to the handle, and 5) said biasing means is interposed between the handle and the second pivot pin for biasing the drawbar relative to the handle toward the retracted position of the drawbar;
• and,
• h) wherein the front and rear legs of the U-shaped base member define congruently extending concave curves that closely receive the second pivot pin when the handle is "fully closed" to assist in maintaining the second pivot pin in a desired position.

In a toggle type draw latch assembly having a base, having an elongate operating handle that is pivotally connected by means of a first pivot pin to the base near one end region of the handle for permitting movement of the handle relative to the base about a first pivot axis of the first pivot pin between a fully open position wherein a portion of the handle is extended relative to the base and a fully closed position wherein the handle portion is situated relatively near to the base, having a hand grip formed near the opposite end region thereof, having a drawbar pivotally connected to the handle at a location that is nearer to the one end region of the handle than to the hand grip, with the drawbar being pivotally movable relative to the handle about a second pivot axis between an extended position and a retracted position wherein a portion of the drawbar is situated relatively near to the hand grip, the improvement comprising:

• a) the base being formed as an assembly of a substantially L-shaped member and a substantially U-shaped member;
• b) the L-shaped member having a substantially flat mounting leg that is joined by a substantially right angle bend to a substantially flat end leg that has a length measured from the right angle bend that is less than is the length of the mounting leg measured from the right angle bend, with the mounting leg and the end leg each having front and rear portions that are located on opposite sides of a common imaginary center plane that intersects substantially at right angles the mounting leg and the end leg along imaginary center lines that extend substantially centrally with respect to the mounting leg and the end leg, respectively;
• c) the U-shaped member having a pair of substantially flat, similarly configured, front and rear legs that are rigidly connected by substantially right angle bends to a substantially flat base leg, with the front and rear legs:
• 1) being oriented to extend in spaced, substantially parallel relationship so as to overlie each other;
• 2) having end surfaces that overlie each other and that extend substantially perpendicular to the substantially flat base leg;
• 3) having aligned holes formed therethrough that are of a size that will closely receive the first pivot pin;
• d) first connecting means for rigidly connecting the U-shaped member to the L-shaped member 1) such that the front and rear legs of the U-shaped member are positioned to extend in substantially parallel planes on opposed front and rear sides of, and at substantially equal distances from said imaginary center plane, 2) such that the base leg of the U-shaped member engages a selected one of the mounting leg and the end leg of the L-shaped member, and 3) such that the overlying end surfaces of the front and rear legs of the U-shaped member engage the other of the mounting leg and the end leg of the L-shaped member;
• e) the handle being formed as an assembly that includes:
• 1) a pair of elongate front and rear handle members that extend in overlying relationship from A) overlying first end regions of the front and rear handle members that have aligned holes formed therethrough that are of a size that will closely receive the first pivot pin, and B) overlying second end regions of the front and rear handle members are similarly configured and cooperate to define a handgrip;
• and,
• 2) stop formation means defined by overlying, similarly configured formations of the front and rear handle members for cooperatively defining a stop that engages a selected one of the mounting leg and the end leg of the L-shaped base member when the handle is in a selected one of its fully open and fully closed positions;
• f) safety catch means for being movably connected to the base for extending adjacent the handle when the handle is in its closed position, and for being connected to the base at a location that positions the safety catch means beside a selected portion of the handle that is located between said one and opposite end regions when the handle is in its closed position;
• and,
• g) a safety catch engagement formation connected to the handle and being movable therewith as the handle pivots relative to the base between said open and closed positions, with the safety catch engagement formation being configured to engage and to be releasably retained by the safety catch means when the handle is in its closed position.

In a toggle type draw latch assembly that has a base, an elongate operating handle that is pivotally connected to the base near one end region thereof by means of a first pivot pin that extends through first aligned holes formed through the handle, with the handle being movable between an open position and a closed position wherein a portion of the handle is situated relatively near to the base, having a hand grip formed near the opposite end region thereof, having a drawbar pivotally connected to the handle at a location that is nearer to the one end region of the handle than to the hand grip by means of a second pivot pin that extends through second aligned holes formed through the handle, with the drawbar being connected to the second pivot pin and being movable about the axis of the second pivot pin relative to the handle between an extended position and a retracted position for engaging a latch-engageable formation to establish a connection between the latch assembly and the latch-engageable formation, the improvement comprising:

• a) safety catch means for being movably connected to the base for extending adjacent the handle when the handle is in its closed position, and for being connected to the base at a location that positions the safety catch means beside a selected portion of the handle that is located between said one and opposite end regions when the handle is in its closed position;
• b) a safety catch engagement formation connected to the handle and being movable therewith as the handle pivots relative to the base between said open and closed positions, with the safety catch engagement formation being configured to engage and to be releasably retained by the safety catch means when the handle is in its closed position;
• c) wherein the safety catch means 1) includes a catch member that is pivotally connected to the base for movement between latched and unlatched positions, 2) includes biasing means for biasing the catch member toward its latched position, 3) is operable to engage and releasably retain the safety catch engagement formation when the handle is in its closed position and the catch member is in its latched position, and 4) is configured such that, as the handle moves toward its closed position, the catch member is engaged by the safety catch engagement formation and is caused by such engagement to be cammed away from its latched position in opposition to the biasing action of the biasing means to permit the safety catch engagement formation to move into engaged, releasably retained relationship with the catch member when the handle reaches its closed position;
• d) with the safety catch means also defining first shackle engagement formation means for receiving the shackle of a padlock when the catch member is in its latched position, with the received shackle physically blocking movement of the catch member from its latched position to its unlatched position;
• e) the handle being formed as an assembly that includes a pair of elongate front and rear handle members that extend in overlying relationship from A) overlying first end regions of the front and rear handle members that have aligned holes formed therethrough that are of a size that will closely receive the first pivot pin, and B) overlying second end regions of the front and rear handle members are similarly configured and cooperate to define a handgrip;
• and,
• f) first connecting means for being interposed between and for rigidly interconnecting overlying portions of the front and rear handle members while maintaining a spaced relationship between the front and rear handle members.

A handle operated toggle-type draw latch assembly for mounting on one of two members for engaging a latch-engageable formation connected to the other of the two members for exerting force on the two members that tends to draw the two members relatively toward each other and for releasably retaining the two members in joined relationship, comprising:

• a) base means for being connected to a mounting surface of said one of two members that are to be joined and releasably retained in joined relationship, for defining spaced, parallel extending front and rear members, for defining a safety catch mount that extends away from the mounting surface at a location spaced along the mounting surface from the location of the handle mounting means, with a first imaginary pivot axis being defined by one set of aligned holes formed through the front and rear members, and with a third imaginary pivot axis being defined by the safety catch mount;
• b) first pivot pin means extending through and being closely received by the one set of aligned holes formed through the front and rear members and extending along the first pivot axis;
• c) handle means including an elongate handle that is formed by elongate front and rear handle members that are similarly configured so as to define corresponding formations that overlie each other but that are held in spaced relationship by mounting means that rigidly connects the front and rear handle members, with the corresponding formations that overlie each other including 1) first end regions that define a first set of aligned holes formed therethrough that closely receive the first pivot pin means to pivotally connect the elongate handle to the base means, 2) second end regions that cooperate to define overlying handgrip formations, 3) first, second and third sets of overlying formations that cooperate to define first, second and third stops located at spaced positions along the length of the handle between the first and second end regions, and 4) a second set of aligned holes formed through the front and rear handle members for defining a second pivot axis that extends transversely relative to the length of the handle in a direction that substantially parallels the first pivot axis but is spaced along the length of the handle from the first pivot axis, and with the pivotal connection of the handle means and the base means being operative to permit movement of the handle means relative to the base means about the first pivot axis in a closing direction of movement toward a closed position wherein the first stop formation engages the base means to prevent further relative movement of the handle in said closing direction of movement, and in an opening direction of movement that extends opposite the closing direction of movement toward an open position wherein the second stop formation engages the base means to prevent further relative movement of the handle in said opening direction of movement;
• d) second pivot pin means connected to the handle and being configured to extend generally along the second pivot axis;
• e) drawbar means including an elongate drawbar for being connected to the second pivot pin means for pivotal movement relative to the handle for selectively being brought into engagement with the latch-engageable formation when the handle is pivoted to its open position, and for transmitting force to and establishing a joining connection with the latch-engageable formation when the handle is moved to its closed position while the drawbar means is engaging the latch-engageable formation, and for being pivoted to a retracted position wherein the drawbar engages the third stop formation of the handle;
• f) third pivot pin means connected to the safety catch mount at the second location along the base means and being configured to extend along the third pivot axis;
• and,
• g) safety catch means including a safety catch member for being pivotally connected by the third pivot pin means to the base means for pivotal movement relative to the base means about the third pivot axis between latched and unlatched positions, for defining a safety catch formation engagement means for receiving and releasably retaining a handle-carried catch engaging formation when the handle is pivoted to its closed position and when the safety catch is pivoted to its latched position, and including biasing means interposed between the base means and the safety catch member for biasing the safety catch member away from its unlatched position toward its latched position.

In a toggle type draw latch assembly having a base, having an elongate operating handle that is pivotally connected by means of a first pivot pin to the base near one end region of the handle for permitting movement of the handle relative to the base about a first pivot axis of the first pivot pin between a fully open position wherein a portion of the handle is extended relative to the base and a fully closed position wherein the handle portion is situated relatively near to the base, having a hand grip formed near the opposite end region thereof, having a drawbar pivotally connected to the handle at a location that is nearer to the one end region of the handle than to the hand grip, with the drawbar being pivotally movable relative to the handle about a second pivot axis between an extended position and a retracted position wherein a portion of the drawbar is situated relatively near to the hand grip, the improvement comprising:

• a) the base being formed as an assembly of a substantially L-shaped member and a substantially U-shaped member;
• b) the L-shaped member having a substantially flat mounting leg that is joined by a substantially right angle bend to a substantially flat end leg that has a length measured from the right angle bend that is less than is the length of the mounting leg measured from the right angle bend, with the mounting leg and the end leg each having front and rear portions that are located on opposite sides of a common imaginary center plane that intersects substantially at right angles the mounting leg and the end leg along imaginary center lines that extend substantially centrally with respect to the mounting leg and the end leg, respectively;
• c) the U-shaped member having a pair of substantially flat, similarly configured, front and rear legs that are rigidly connected by substantially right angle bends to a substantially flat base leg, with the front and rear legs:
• 1) being oriented to extend in spaced, substantially parallel relationship so as to overlie each other;
• 2) having end surfaces that overlie each other and that extend substantially perpendicular to the substantially flat base leg;
• 3) having aligned holes formed therethrough that are of a size that will closely receive the first pivot pin;
• d) first connecting means for rigidly connecting the U-shaped member to the L-shaped member 1) such that the front and rear legs of the U-shaped member are positioned to extend in substantially parallel planes on opposed front and rear sides of, and at substantially equal distances from said imaginary center plane, 2) such that the base leg of the U-shaped member engages a selected one of the mounting leg and the end leg of the L-shaped member, and 3) such that the overlying end surfaces of the front and rear legs of the U-shaped member engage the other of the mounting leg and the end leg of the L-shaped member;
• e) the handle being formed as an assembly that includes:
• 1) a pair of elongate front and rear handle members that extend in overlying relationship from A) overlying first end regions of the front and rear handle members that have aligned holes formed therethrough that are of a size that will closely receive the first pivot pin, and B) overlying second end regions of the front and rear handle members are similarly configured and cooperate to define a handgrip;
• and,
• 2) stop formation means defined by overlying, similarly configured formations of the front and rear handle members for cooperatively defining a stop that engages a selected one of the mounting leg and the end leg of the L-shaped base member when the handle is in a selected one of its fully open and fully closed positions;
• f) drawbar biasing means for biasing the drawbar to pivot toward its retracted position relative to the handle;
• g) wherein 1) the front and rear handle members are spaced apart at a chosen location situated between the location of the handgrip and the location of the aligned holes, 2) aligned circular openings are formed through the spaced front and rear handle members at said chosen location, 3) an elongate second pivot pin extends through and is closely received within the aligned circular openings so as to be pivotally connected to the handle for movement relative to the handle about an imaginary second pivot axis that extends centrally along the length of the second pivot pin, 4) the drawbar is connected to opposite end regions of the second pivot pin for pivotal movement therewith relative to the handle, and 5) said biasing means is interposed between the handle and the second pivot pin for biasing the drawbar relative to the handle toward the retracted position of the drawbar;
• h) wherein the biasing means includes a torsion coil spring having at least one coil of spring wire that extends relatively loosely about a central portion of the second pivot pin that extends between the spaced front and rear handle members at said chosen location;
• i) wherein a radially extending hole is formed in said central portion of the second pivot pin, with the radially extending hole being located substantially mid-way between the front and rear handle members;
• j) wherein an elongate pin member has one portion that is pressed into the radially extending hole, and another portion that projects radially outwardly from the radially extending hole;
• and,
• k) wherein the torsion coil spring has:
• 1) first and second end regions that are connected to the handle;
• 2) a central region that is connected to said another portion of said elongate pin member near where said elongate pin member emerges from said radially extending hole;
• 3) a first set of coils that is formed integrally with said first end region and with said central region, and that are reeved loosely about the central portion of the second pivot pin at a location between the front handle member and the location where the elongate pin member emerges from said radially extending hole;
• and,
• 4) a second set of coils that is formed integrally with said second end region and with said central region, and that are reeved loosely about the central portion of the second pivot pin at a location between the rear handle member and the location where the elongate pin member emerges from said radially extending hole.