JPS61209742A - Fixture caulker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a swaging tool for a two-part fixture that requires pressing one part and pulling another part to swage the fixture. , a thrust member capable of reciprocating back and forth along the axis of the housing and having a fixture engaging surface at its front end that presses a part of the fixture during the caulking operation of the fixture; The present invention relates to a tool that is reciprocally movable and includes a tensioning means for pulling other parts of the fixture against the thrust member during the caulking operation of the fixture.

(Prior Art) A tool for crimping two-part fasteners, e.g. a blind rivet assembly and a lock bolt, which comprises a housing and reciprocates along a common axis, as the case may be, the rivet head of the blind rivet assembly or the lock bolt. Tools are known in which a thrust member for pressing on the collar of the former and tensioning means for pulling the mandrel of the former or the bolt of the latter are arranged in the housing. It is also known to effect the stroke of the thrust member and tensioning means with hydraulic pressure. Additionally, U.S. Patent No. 3.996 detailing a lock bolt staking tool.
No. 784, the thrust member consists of a sleeve with a piston i at its rear end, and the tensioning means consists of a sleeve mostly housed within the sleeve of the thrust member, also with a piston at its rear end, both pistons being identical. An arrangement is disclosed which operates within a hydraulic cylinder and in which the piston of the tensioning means is located behind the piston of the thrust member. The cylinder is provided with a boat that introduces pressurized fluid at each end of the cylinder wall and at an intermediate location. The operating stroke of the thrust member and tensioning means is therefore effected by valve means controlling the flow of fluid through each of the boats of a cylinder.

(Problem to be Solved by the Invention) According to the above, a certain degree of independence in the movement of the thrust member and the tensioning means can be obtained with a tool of simple and economical construction, but such independence of movement is The stroke of the thrust member is limited to the cylinder part forward of the boat, while the stroke of the tensioning means is limited to the cylinder part aft of the boat.

It is therefore an object of the present invention to enable the pistons of the thrust member and of the tension means to operate within the same cylinder, and to introduce fluid into or out of the pistons at any selected position along the cylinder. It is an object of the present invention to provide a hydraulically operated fastener crimping tool which is movable together over the entire length of a cylinder.

(Means for Solving the Problems) According to the present invention, the above object is a crimping tool for a two-component fixture in which it is necessary to press one part and pull another part in order to crimp the fixture. , a thrust member capable of reciprocating back and forth along the axis of the housing and having a fixture engaging surface at its front end that presses a part of the fixture during the caulking operation of the fixture; A tool that is reciprocally movable and equipped with a tensioning means for pulling other parts of the fixing device against the thrust member during the caulking operation of the fixing device, wherein the thrust member has a piston at its rear end that is slidable within a hydraulic cylinder. Consisting of
The tensioning means comprises a sleeve having at its rear end a piston which projects forward into the sleeve of the thrust member and is slidable within said cylinder behind the piston of the thrust member, and applies pressurized fluid to the rear of the piston of the tensioning means. A fluid passageway is provided in the housing which is capable of acting in front of the pistons of the thrust member to cause the pistons to advance and to cause the pistons to retract by passing through the sleeve of the tensioning means in the vicinity of the pistons. A fixture crimping tool, further comprising a fluid passage opening into the cylinder between the two, through which pressurized fluid is introduced to separate the pistons and effect the fixture crimping stroke of the tool. achieved.

Preferably, the tool according to the invention includes means for supplying pressurized air into the cylinder in front of the piston of the thrust member and rearward of the piston of the tensioning means, and means for supplying working fluid into the sleeve of the tensioning means and supplying pressurized air between the two pistons in the cylinder. Means are provided to guide the Also preferably, a hollow cylindrical rod or sleeve of the housing extends forwardly from an end cap at the rear end of the cylinder through an annular seal in the piston of the tensioning means and abuts an inner surface of the sleeve of the tensioning means. The hydraulic oil, which is led into the cylinder between the two pistons, passes from the rear through the hollow rod and into the passage in the wall of the hollow rod formed immediately behind the annular seal and into the annular chamber between the hollow rod and the tension sleeve. and into a passageway through said wall adjacent to the piston of the tensioning means. The hollow rod described above may have double cylindrical walls, allowing hydraulic fluid to flow through the space between the two walls sealed at each end.

The tool according to the invention can be applied to swage blind rivet assemblies of the tension type, in which case the thrust member provides a nose piece that abuts the rivet head of the blind rivet assembly, and the tension means are attached to the shank of the mandrel. and the tool further introduces air after the rear piston to advance both pistons to the front end of the cylinder, and introduces working fluid between the pistons to caulk the rivet and forward the front piston. In particular, a blind riveting tool equipped with a power operating means according to the invention, which includes valve control means for introducing air to retract both pistons and for discharging working fluid from between both pistons, is particularly suitable for Such a tool according to the present invention is particularly suitable when it is desired to retract the thrust member within the housing to facilitate the feeding of a new blind rivet assembly into the nosepiece. The structure of the tool, excluding the power unit, will not be described in detail here.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power device for an exemplary blind riveting tool according to the present invention will be described in detail with reference to the accompanying drawings. It will be understood that this example tool is chosen as an illustrative example and is not intended to limit the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the exemplary tool comprises a housing 10 with a rearward extension providing a pneumatic/hydraulic cylinder with a bore 30 extending therethrough.

An abutment or thrust member 50 (FIG. 1) comprising a hollow cylindrical sleeve 52 is axially reciprocatably mounted within the housing 10, and the sleeve 52 is connected to an annular seal 54 within the housing (FIG. 2). It is possible to slide through the
It has a hollow piston 56 at its rear end that can slide through the hole 30. A nosepiece 58 is screwed to the front end of the sleeve 52.

Mounted within the abutment member 50 is a second hollow piston assembly that constitutes the mandrel tensioning means 70 of the exemplary tool. At its rear end, the mandrel tensioning means 70 has a hollow piston 71 (FIGS. 1 and 2) slidable in the bore 30 of the cylinder 12 behind the piston 56. Piston 71 is secured to a sleeve 72 of a mandrel tensioning means which is slidable through an annular seal 57 within piston 56 .

The construction of an exemplary tool and its operation for crimping blind rivets is described in detail in our co-pending patent application Ser.

A tube 110 (FIGS. 2 and 3) extends rearwardly from the collet 80 to provide a small diameter passage through the mandrel tensioning means 70 and is freely passable into the hollow sleeve 112. Sleeve 112 has a large diameter head 114 at its forward end, which has an annular seal 115 that abuts the inner wall of sleeve 72 . Sleeve 112 extends rearwardly through a seal 117 within piston 71. Two bearing parts 116 (immediately behind the large diameter head 114 in FIG. 2) and 11
8 (FIG. 3), the entire length of the sleeve 112 is small in diameter, both wheel bearing portions support the sleeve 120, and an annular chamber 122 (FIG. 3) is formed within the sleeve 120 between the two wheel bearing portions. Sleeve 120 has an outer diameter that is smaller than the inner diameter of sleeve 72, providing an annular chamber 123 therebetween. Communication between both annular chambers 122 and 123 is provided by bearing portion 116.11.
ports 12 at each end of sleeve 120, each adjacent to port 8;
4; as is clear from this, the entire stroke length of the piston 71 corresponds to the distance between the two ports. Sleeve 112 is secured at its rear end to an end cap 126 mounted on cylinder 12; thus securing sleeve 112 and head 114 within housing 10.

The housing 10 of the exemplary tool includes each piston 56 and 71
It has passages for oil and air to effect the forward and backward strokes of the engine. That is, there is an inlet 130 in the handle 18 of the housing 10 through which oil can enter and exit the end cap 126 via a tube 128. The means for connecting the inlet 130 to the hydraulic amplifier are not shown in the figure and are of conventional construction. Oil flows from tube 128 through passage 131 in end cap 126 and through boat 124 at the rear end of sleeve 120 to both sleeves 112.1.
20 into the annular chamber 122 between the sleeves 12 and 12.
0 through the port 124 at the front end of the mandrel tensioning means 70
into the sleeve 72. A boat 136 opens through the sleeve 72 just forward of the piston 71 (
(FIG. 3); that is, the pressure oil flowing through the boat 136 into the bore 30 of the cylinder 12 exerts pressure on both pistons 56, 71, causing them to separate. When hydraulic pressure is released, oil flows in the opposite direction through the system.

The rear surface of the piston 56 and the front surface of the piston 71 are inlets 130
The piston 5 is constantly exposed to the pressure oil supplied to the piston 5.
The front surface of piston 6 and the rear surface of piston 71 are constantly exposed to air. The air is therefore supplied to the housing 10, which is provided according to normal practice in double-acting cylinders, although not detailed here.
appropriate ports 156 (Fig. 2), 158 (Fig. 3) within
and passages into and out of the front and rear parts of the cylinder 12.

Suitable means are provided for controlling fluid flow within the exemplary tool to move the piston and control the sequence thereof, which is described in detail in the co-pending patent application cited above; A brief summary will be given only as far as the equipment is concerned.

It is most convenient to consider the operating cycle of the rivet clinching portions of the exemplary tool to begin with the abutment member 50 and mandrel tensioning means 70 in their respective forward positions as shown in FIG.

A means for sequentially operating each part of the tool by controlling the flow of air and hydraulic oil is schematically shown in FIG. When the tool is at rest as shown in FIG. 1, air from compressed air source 200 enters the rear end of cylinder 12 behind piston 71 through two-position valve 202 and valve 204.

That is, the contact member 50 is held in the housing at its forwardmost position by pressurized air in the cylinder 12 behind the piston 71 in contact with the piston 56, and the oil pressure at the inlet 130 is atmospheric pressure. The air behind the actuation sleeve 100 is also under pressure.

The tool is now directed at the workpiece (not shown) and the rivet of blind rivet assembly B is inserted into the hole in the workpiece by nosepiece 58. A push button switch for the electric control circuit is provided on the hand grip 18, and when the operator presses this switch, the solenoid valve 20 in the hydraulic circuit is activated.
6 is energized, and pressure oil from the pressure amplifier 208 enters the inlet 13.
0 is further introduced into the cylinder 12 between the two pistons 56, 71. At the same time, two-position valve 202 is energized and immediately opens a passage for exhausting air behind piston 71.

Pressure oil forces both pistons 56, 71 apart, and as usual,
The rivet is caulked by pulling the mandrel while pressing the rivet head; the mandrel finally breaks at the neck of the rivet where the cross section of the mandrel shank is reduced, and the broken part of the mandrel shank is connected to the tube 110 and the sleeve i.
t 2 ” and a suitable receptacle is connected to the vessel (into the hose 150. limited by the physical structure.

Energization of valve 202 opens hole 28 behind sleeve 100 to vent air and pressurizes air line 210 leading to the front of cylinder 12 . However, at this point, the tensioning means 70 is held by the mandrel in front, so
Piston 56 cannot be retracted. However, when the mandrel breaks, piston 56 moves rearward and pushes piston 71 rearward. After a preset time delay in the electrical control circuit, the solenoid valve 206 is deenergized and the spring pressure causes the pressure oil to flow back out of the cylinder 12 between the pistons 56 and 71.

Later in the operating cycle of the exemplary tool, after a new blind rivet assembly has been loaded into the nosepiece 58, the abutment member 50 and mandrel tensioning means 70 are advanced by introducing air into the bore 30 behind the piston 71. Then return the tool to the state shown in FIG. Both pistons 56.71
Advancement of the valve 202 is accomplished by deenergizing the solenoid of the valve 202 and reversing the directed valve 202, which reversal is accomplished by pressing the pushbutton 14.
This occurs when a predetermined period of time, set by the time delay of the electrical control circuit, has elapsed after pressing 8. Thus, regardless of whether the operator releases pushbutton 148, the tool returns to the state shown in FIG. 1, but the second cycle does not begin until the operator releases pushbutton 148 and presses it again.

In the illustrated tool, when both pistons 56, 71 are at the front of cylinder 12, high pressure oil flows into both pistons 56, 71.
When the piston 56 begins to move rearward along the cylinder, i.e. shortly after the valve 206 is deenergized, the pressure oil is discharged from between the two pistons. In any case, the structure is such that fluid can be introduced into and removed from the cylinder 12 while each piston is generally stationary or moving along the cylinder 12, or both.

[Brief explanation of the drawing]

FIG. 1 is a side view, partially in longitudinal section, of an exemplary tool, the tool being loaded with a blind rivet assembly;
The tool is now ready to be applied to the workpiece for a blind riveting operation; Figure 2.3 is a partial view showing the structure of the two pistons and power plant related parts shown in Figure 1. 1 is enlarged and shown in detail; and FIG. 4 is a circuit diagram of the fluid control means of the tool. DESCRIPTION OF SYMBOLS 10... Housing, 12... Fluid pressure cylinder, 50... Thrust member, 52... Same sleeve, 56... Same piston, 58... Nose piece, 70... Tension means, 122 .123,124,136,156°158...
・Fluid passage, 14B... Push button, 200.202... Pressurized air supply means, 206.20
8... Hydraulic oil supply means.

Claims (1)

[Claims] 1. A caulking tool for a two-part fixture that requires pressing one part and pulling another part to caulk the fixture, which reciprocates back and forth along the housing and the axis of the housing. a thrust member that is movable and has a fixture engaging surface at its front end that presses a part of the fixture during the caulking operation of the fixture; The tool includes a tensioning means for tensioning the other parts of the fixture relative to the thrust member, wherein the thrust member comprises a sleeve having a piston at its rear end slidable within a hydraulic cylinder, and the tensioning means comprises a sleeve of the thrust member. The sleeve has a piston at its rear end that projects inwardly and forwardly and is slidable within the cylinder behind the piston of the thrust member, and pressurized fluid is applied to the rear of the piston of the tensioning means to advance both pistons. A fluid passageway is provided in the housing capable of acting in front of the pistons of the thrust member to retract both pistons, the fluid passing through the sleeve of the tensioning means near the pistons and opening into the cylinder between the pistons. A fixture staking tool, further comprising a passageway through which pressurized fluid is introduced to separate the pistons and effect a fixture staking stroke of the tool. 2. Means for supplying pressurized air into the cylinder in front of the piston of the thrust member and rearward of the piston of the tensioning means, and means for supplying working fluid into the inside of the sleeve of the tensioning means and guiding it into the cylinder between both pistons are provided. The tool according to claim 1, characterized in that: 3. The thrust member provides a nosepiece that abuts the rivet head of the blind rivet assembly, the tensioning means is arranged to pull the shank of the mandrel, and the tool further introduces air behind the rear piston to tighten both pistons. Valve control that advances the front end of the cylinder to the front end of the cylinder, introduces working fluid between both pistons to caulk the rivet, introduces air in front of the front piston to move both pistons backward, and discharges the working fluid from between the pistons. The tool according to claim 2, which is suitable for blind riveting, characterized in that it is equipped with means.