RU2191104C2 - Explosive-actuated mounting gun - Google Patents

Abstract

FIELD: explosive actuated hand tools. SUBSTANCE: invention relates to hand tools employing energy of explosion with adjustment of power and it can be used for driving steel expansion bolts into building structures using cartridges of different power. proposed mounting gun has housing, barrel with gas outlet hole and cartridge chamber and piston arranged in barrel bore for acceleration, it has also power regulator provided with adjusting screw and spool placed in space in barrel body communicating with gas outlet hole. Edge of gas outlet hole is made at a distance from barrel bottom equal to m≥1, where m is distance from edge of gas outlet hole to barrel bottom, and l is length of piston acceleration stroke. Power regulator spool is made separately from adjusting screw being spring-loaded for engagement with its edge. EFFECT: provision of initial driving of expansion bolt into partition at constant initial speed within wide range of cartridge powers, increased sensitivity of power regulation, improved layout of device as a whole. 2 dwg

Description

 The invention relates to hand tools using blast energy, in particular to powder guns with power adjustment, and can be used to hammer steel dowels with cartridges of various power into building structures made of concrete, low carbon steel and brickwork when fastening building elements, equipment to them and engineering communications.

 Known powder mounting gun with a power regulator driving plugs by adjusting the displacement of the piston, which changes the volume of the chamber of the pre-piston space. [1].

 The disadvantage of this design is that when adjusting during the displacement of the piston towards the dowel head, the piston acceleration course decreases, which leads to a decrease in the initial entry speed of the dowel into the concrete structure. In this case, the axis of penetration of the dowel into the building structure with a concrete spalling occurs.

 Known powder mounting gun with a power regulator of a throttle type, selected as a prototype, the spool of which is made integral with the adjusting screw, while the edge of the gas outlet in the barrel coincides with the end of the piston in its extreme rear position (with the bottom of the barrel) [2].

 In this design, there is a decrease in speed, the piston approaches the dowel head in the portion of its acceleration (piston) stroke, which also leads to a decrease in the initial speed of the dowel entering the obstacle. In addition, this design, the spool of which is made integral with the adjusting screw, reduces the sensitivity of the adjustment and the stability of the power adjustment due to the certain distance of the spool placement cavity from the gas outlet in a wide range of different power cartridges, creating inconvenience in the layout of the product.

 The problem to which the invention is directed, is to ensure the initial introduction of the dowel into the barrier with a constant initial speed in a wide range of cartridge power, increasing the sensitivity of power control and the convenience of the layout of the product as a whole.

 To do this, in a powder mounting gun containing a housing, a barrel with a gas outlet and a chamber located in the bore with the possibility of acceleration by the piston, as well as a power regulator mounted on the housing, having an adjusting screw and a spool placed in a cavity in the barrel body in communication with a gas outlet, the edge of the gas outlet is made from the bottom of the barrel at a distance m ≥ l, where m is the distance from the edge of the gas outlet to the bottom of the barrel, l is the piston acceleration stroke length. And the spool of the power regulator is performed separately from the adjusting screw and spring-loaded with the possibility of interaction with its end face.

 The invention is illustrated by drawings, which depict in figure 1 - General view of the gun with a fragment of the layout of the power regulator; figure 2 - the barrel and the body of the gun in the context, placed in them by the piston and parts of the power regulator, top view.

 The piston and parts of the power regulator are shown in the initial state before firing. The powder mounting gun contains a housing 1, in the back of which is located on the right side the handle of the adjusting screw 2 of the power regulator 3. In the barrel 4 there is a piston 5, the end of which abuts against the bottom 6 of the barrel 4. The shock part 7 of the piston 5 is located at a distance of the acceleration stroke " l "from the cap of the dowel 8. The edge of the gas outlet 9 is located from the bottom 6 of the barrel at a distance of" m ". A spring-loaded spool 10 is placed in the cavity of the barrel body with the possibility of interaction with the end face of the adjusting screw 2. The cartridge 11 is located in the barrel chamber 4.

 Powder mounting gun works as follows.

 Before firing the handle of the adjusting screw 2 by moving the spool 10 set the required power level. After striking the capsule of the cartridge 11, acceleration of the piston 5 begins until its shock part 7 comes into contact with the dowel head 8, while the piston travels a distance m ≥ l and the tip of the dowel 8 begins to penetrate the obstacle. The energy accumulated during acceleration of the piston provides a constant initial rate of introduction of the dowel into the obstacle in a wide range of capacities of the cartridges used. With further movement of the piston, its end reaches the edge of the gas outlet 9 and the gas enters the gas outlet. The position of the spool 10, controlled by moving the handle of the adjusting screw 2 in the axial direction, changes the degree of overlap of the gas outlet and the amount of gas set by the regulator is vented outside the barrel. Thus, the adjustment of the penetration power of the dowel is already in the body of the barrier, which allows you to accurately hammer the dowel to the full length (no more) without damaging the connected structures with an excess of energy. In this case, a separate execution of the spool with the possibility of interaction with the adjusting screw allows you to bring it as close as possible to the high-pressure chamber and increase the sensitivity of adjustment.

 In the gun reloading of cartridges is carried out by moving the barrel 4 to the front and rear positions and the spool 10 moves together with the barrel 4, and since the spool is spring-loaded, in the initial position of the barrel before firing the spool comes into contact with the end face of the adjusting screw 2 and occupies the position corresponding to the set power level. Separate execution of the spool from the adjusting screw allows you to place the power regulator control in the most convenient place for working with the product.

 This design is implemented in the PMT-l model gun powder gun. Design and technological documentation was developed, and samples were tested. Preparations are underway for its production in mass production.

Sources of information
1. Swiss patent 593919. 05.O9.1976, MKI B 25 C 1/14.

 2. US patent 4883212, 11.28.1989, NCI 227/9, 227/10, MKI B 25 C 1/14 - prototype.

Claims (1)

 A powder mounting gun comprising a body, a barrel with a gas outlet and a chamber and a piston located in the barrel with the possibility of acceleration, a power regulator fixed in the housing, having an adjustment screw and a spool placed in a cavity in the barrel body in communication with the gas outlet, characterized in that the edge of the gas outlet is made from the bottom of the barrel at a distance m ≥ l, where m is the distance from the edge of the gas outlet to the bottom of the barrel, l is the length of the piston acceleration stroke, and the power control valve olnen and separately from the adjusting screw and spring biased to engage with its end face.

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