US3004688A - Cement extruding guns - Google Patents

Description

Oct. 17, 1961 J. A. DURAN CEMENT EXTRUDING GUNS 2 Sheets-Sheet l- Filed Sept. 21, 1959 Jul/6n far John A Duran, .B y his Afforney Oct. 17, 1961 J. A. DURAN CEMENT EXTRUDING GUNS 2 Sheets-Sheet 2 Filed Sept. 21, 1959 United States This invention relates to'cement extruding guns and has for its principal object the provision of a novel and improved portable hand-operated cement extruding gun adapted to be filled with molten cement from a separate cement-handling apparatus of the type disclosed and described in detail in an application for United States Letters Patent Serial No. 838,152, filed September 4, 1959, in the names of Adolph S. Dorosz and William R. Wade. It will be understood, however, that the gun of this invention is not limited to use with the particular type of cement handling apparatus described in the mentioned application or to the exact mechanical construction illustrated.

The cement handling apparatus referred to above has a heated casing provided with a conical recess in which the conical nozzle portion of the extruding gun may be 7 placed to receive molten cement fed into the recess, and

thence into the gun, in response to the actuation of a control member located adjacent to the recess and adapted to be engaged by a control surface. on a member associated with the gun when the gun is rotated through a partial turn to couple it to the cement handling apparatus. In accordance with a feature of this invention, a plunger which is slidable within a cylindrical bore formed in the nozzle portion of the gun isarranged to be moved along the bore and toward a discharge orifice at oneend of the nozzle to extrude molten cement through the orifice by means of an operating lever provided with a control surface for engaging the control memberof the cement handling apparatus and having an operating arm which is provided with an abutment surface adapted to engage a member connected to the plunger when the lever is swung in a direction to move the plunger toward the orifice in the nozzle. More particularly, the plunger moving means comprises a first lever pivotally mounted on the body of the gun and having an arm provided with the control surface extending above the body of the gun and an operating arm extending below the gun body and provided with an abutment surface, together with a second lever, also pivotally mounted on the body of the gun with one end connected to the plunger by a link and with a roller on its other end adapted to be engaged by the abutment surface on the first-mentioned lever. With the aforementioned arrange ment, when a partially or fully emptied gun is to be coupled to the cement handling apparatus, the operating lever may be swung to a position corresponding to that of a full gun, thereby avoiding initiation of the operation of the cement handling apparatus. Later, when it is desired to start operation of the cement handling appa ratus to fill the gun, the operating lever may be returned to a position in which the abutment surface thereon engages the roller on the other lever. This will bring the control surface on the operating lever into engagement with the surface of the control member of the cement handling apparatus and thus Will initiate operation of that apparatus to fill the gun.

In accordance with another feature of the invention,

areflt '2 the nozzle of the gun is connected to the body portion by means of a generally U-shaped member to provide an open space adjacent to one end of the nozzle into which the plunger is adapted to project at one end of its stroke whenthe gun is filled. More particularly, the U-shaped member is, in turn, connected to the body of the gun by means of spaced parallel blocks of insulating material; while the nozzle has a cylindrical bore open at one'end.

' ing the plunger in one direction thus to extrude cement through the orifice includes a lever connected to the plunger by means of a link and arranged to limit movement of this plunger in the opposite direction to a position in which a portion of the plunger projects from the bore of the nozzle and into the aforementioned open space. With this construction, any molten cement which may leak past the plunger will be discharged into the open space and should any cement solidify on the projecting portion of the plunger, it will be scraped therefrom and fall through the open space as the plunger is next operated to extrude molten cement through the nozzle orifice.

The above and other objects and features of the invention will appear in the following detailed description.

of the embodiment thereof which is illustrated in the accompanying drawings and will be pointed out in the claims.

In the drawings,

FIG. 1 is a view in side elevation of a portable handoperated cement extruding gun embodying the features of this invention; 7

FIG. 2 is a plan view of the gun shown in FIG. 1, and

FIG. 3 is a view in side elevation of the extruding gun shown associated with a cement handling apparatus used for loading the gun with molten cement.

Referring to these drawings, and particularly FIGS. 1 and 2 thereof, the extruding gun therein illustrated comprises a conical nozzle portion 10 provided with a cylindrical bore 12 and a discharge orifice 14. Fit-ted over and brazed to a stem portion 15 on the nozzle are a pair oflaterally extending lugs 18, 18 and a U-shaped member 20. The body portion of the gun comprises a pair of spaced parallel plates 22, 22 which are secured at one end to a wooden hand grip 24 by rivets 26, 26, and at the other end to a pair of spaced blocks 28, 28, formed of heat insulating material, by means of rivets 30, 30 and spacer washers 32, 32. The nozzle 10 is secured to these blocks by means of the U-shaped member 20, rivets 34, 34 and spacer washers 36, 36.

Slidably mounted within the cylindrical bore 12 of the nozzle 10 is a plunger 40 which is connected to one end of an operating lever 42 by means of a link 44. This operating lever is pivotally mounted on the body portion of the gun by means of a cross pin 50 and spacer washers 52, 52, see FIG. 2, and carries at its other end a roller 56, FIG. 1. Also pivotally mounted on the body portion of the gun by means of a cross pin 60 is a trigger lever 62 having a lower operating arm 64 adapted to be engaged by the fingers of an operator and an upper arm 66 which is provided with a control surface 68. As shown in FIG. 2, the operating arm 64 is U-shaped in 3 cross section and is provided with an elongated abutment surface 70, FIG, 1, adapted to engage the roller 56. Preferably, a coil spring 72 is interposed between one portion of the trigger lever 62, see FIG. 2, and a side plate 22 so as to provide a slight frictional resistance to pivotal movement of this lever.

As suggested above, the herein illustrated extruding gun is intended to be filled with molten cement from a cement handling apparatus of the type shown in FIG. 3 and disclosed and described in greater detail in the copending application for United States Letters Patent referred to above. Briefly described, this apparatus has a heated casing 74- provided with a passageway 76 which is in communication with a conical recess 78 through a connecting bore 80. Mechanism including a pair of feed wheels 82, '84, is provided for feeding the leading end of a rod of cement R into the passageway 76 where the rod is melted and from which molten cement is forced through the bore 80 and into the recess 78 when a switch 90 is close as a result of a slight counterclockwise rotation of a control member 92 from the position in which it is shown in FIG. 3.. This control member is provided with an arcuate surface 94 and is adapted to be swung in a clockwise direction, by the action of gravity, to the position shown in FIG. 3 as determined by a stop portion 96, in which position the switch 90 is opened and feeding of the rod of cement terminated.

When the gun is entirely fille'd with molten cement, as shown in FIGS. 1 and 3, the plunger 44 will be moved to the right, see FIG. 1, and to the extent determined by the engagement of the lever 42 with a stop surface 74 on the hand grip 24. Now, upon removal of the gun from the cement handling apparatus, the molten cement within the cylindrical bore 12 may be extruded as a result of movement of the plunger 40 to the left, FIG. -1, in response to pressure applied to the lower arm 64 of the trigger lever 62 by a finger, or fingers of the hand of the operator which holds the gun by means of the hand grip 24. As the cement is thus extruded, the trigger lever swing in a counterclockwise direction, finally arriving in the position shown in dotted lines in FIG. 1, when the bore 12 has been entirely emptied. Now, as is explained in more detail in the above-mentioned application, when the nozzle 10 of the gun is inserted inthe recess 78 of the cement handling apparatus and rotated through a partial turn in a clockwise direction to cause the lugs 18, 18 to engage securing clips associated with the casing 74, one of which securing clips appears in FIG. 3 and is identified by the reference character 98, the control surface 68 on the upper arm 66 of the trigger lever will engage the arcuate surface 94 on the control member 92 and rotate this controlmember through a slight angle in a counterclockwise direction, thereby closing switch 90 and initiating operation of the apparatus to refill the cylindrical bore 12 with molten cement. When the bore 12 has thus been filled with molten cement, the trigger lever 62 will have been returned to the solid line position of FIG. 1 so that surface 68 thereon will have moved beyond the surface 94 on the control member 92, thus permitting this control member to be returned by gravity to the position in which it is shown in FIG. 3, to terminate the feeding of the rod of cement R.

In the event that the operator, after emptying the bore 12, does not intend to use the gun immediately, he may couple the gun to the cement handling apparatus without, however, initiating operation of the feed wheels and extrusion of molten cement into the recess 78, merely by returning the trigger lever 62 to the position shown in solid lines in FIG. 1 prior to placing the gun in the cement handling apparatus, this being possible since the lower arm .64 of the lever 62 is free to move away from the roller 56 as the lever 62 is swung in a clockwise direction. Now when the gun is coupled to the cement handling apparatus, the control surface 68 Will not engage the surface 94 on control member 92. A similar procedure may be followed when the gun is returned to the cement handling apparatus partially emptied. In either case, when the operator wishes to initiate operation of the cement handling apparatus to fillthe gun with molten cement, he merely swings the trigger lever 62 in a counterclockwise direction until the surface 70 on its lower arm 64 contacts the roller 56, at the same time swinging the member 92 in a direction to close the switch 90. Upon release of the member 92 it will be held in operating position by engagement of the arcuate surface 94 with. the control surface 68 in a manner which will be readily understood.

Referring to FIG. 2, it willbe observed that, when the cylindrical bore 12 is entirely filled, the right-hand end of the plunger 40 will project a short distance beyond the stem portion 16 of the nozzle 10 and into the free space provided between the opposite sides of the U-shaped member 20. Thus, any molten cement which may leak past the plunger 40, during movement of the plunger to the left, FIG. 1, to extrude molten adhesive out through the discharge orifice 14, will be forced outwardly through the right-hand end of the bore 12 and into this free space when the plunger is returned to the position shown in FIG. 1. Also, any of the cement which may solidify and stick to the protruding portion of the plunger 40 will be scraped therefrom and will fall through this free space as the plunger is next moved to the left. Accordingly, with the construction illustrated, sticking or binding of the plunger is avoided.

As can be seen in FIGS. 1 and 2, the link 44 operates in a free space between the blocks 28, 28 and plates 22, 22 and is cooled by air circulating through this space. The same is true also with respect to the operating lever 42 which operates in the space between the plates 22, 22. Moreover, because of the line contact between roller 56 and the surface 70 on the lever arm 64 of the trigger operating lever";62, little or no heat is transmitted to the trigger operating lever from the plunger 40. Because of the heat insulating character of the blocks 28, 28, plates 22, 22 remain relatively cool so that heating of the trigger operating lever as a result of direct contact with the plates 22, '22 is'avoided.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent 1. A portable hand-operated cement extruding gun having a body, a hand grip and a nozzle secured to said body, said nozzle being formed to provide a cylindrical bore with a discharge orifice adjacent to one end thereof, a plunger in said bore, means for moving said plunger along said bore toward said orifice to extrude molten cement from said bore out through the orifice, said means comprising a first lever pivotally mounted on the body and having an arm provided with a control surface extending above the body of the gun' and an operating arm extending below said body and provided with an elongated abutment surface and a second lever pivotally mounted on the body of the gun, a link operatively connecting one end of the second lever tosaid plunger, and a roller mounted on the other end of the second lever and adapted to be engaged by said abutment surface when the first-mentioned lever is swung in a direction to move the plunger towardsaid orifice.

A portable hand-operated cement extruding gun having a body, a hand grip and a nozzle, said body comprising a pair of. spaced parallel plates, a generally U-shaped member associated with the nozzle and secured to the body by means of a pair of spaced blocks of heat insulating material to provide an open space adjacent to one end of the nozzle, said nozzle being formed to provide a cylindrical bore open at one end to said space and with a discharge orifice at its other end, a plunger slidably mounted in the cylindrical bore, and manually operable means associated with said body for moving 5 the plunger in one direction from a position adjacent to the open end of the bore toward the other end thereof to extrude molten cement within the bore out through the discharge orifice, said plunger moving means including an operating lever, pivoted to the body between 5 said spaced plates, an operating link connecting said lever to the plunger and extending between said plates, and means on the body providing an abutment surface ar' ranged to limit movement of the operating lever and said plunger in the opposite direction to a position in 10 which a portion of the plunger projects from said bore into the open space adjacent one end of the nozzle.

References Cited in the file of this patent UNITED STATES PATENTS 1,646,614 Frye et a1. Oct. 25, 1927 2,420,203 Sherbondy May 6, 1947 FOREIGN PATENTS 127,849 Australia May 25, 1948

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