DE1244080B - Tool for gripping and inserting open, resilient locking rings - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY Int. Cl .:

B 25b

GERMAN

PATENT OFFICE

EDITORIAL

B25h; B25j
German class: 87 a - 22

Number: 1244 080

File number: W27890Ic / 87a

Registration date: May 19, 1960

Open date: 6th June 1967

The invention relates to the design of a tool for tapping and inserting open, using resilient retaining rings in annular grooves of shafts or similar rod-shaped workpieces a hollow plunger through which each locking ring is axially applied to the face of the Workpiece attachable expansion body is axially displaceable and thus expandable, which is why the Spreader has a diameter that increases up to the diameter of the workpiece.

Assembly devices with expansion body and hollow plunger for the retaining ring to be assembled are known. However, these devices are not particularly suitable when the assembly site is difficult to access. In other devices, pliers-like pivotable handles have become known. In these devices, however, the tools are not as in the invention to the Arranged ends of the mutually pivotable legs. These pliers-like tools were there- not readily applicable in connection with expansion body and hollow ram.

The invention is based on the task of securing rings in a new field of application to open up those cases where the assembly of the locking ring with the known tools encounters certain difficulties due to difficult accessibility. The advantages of circlips have become known in practically all areas of mechanical engineering. With more and more However, the increasing use of circlips resulted in assembly difficulties in some cases, which are to be remedied by the device according to the invention.

The invention accordingly consists in that in a tool of the type described above Hollow plunger and the expansion body at the free ends ■ of about a hinge axis like tongs against each other pivotable arms are arranged, one of which is fixed with a handle is connected, in which the other arm is pivotably mounted about the hinge axis, that also the an arm ends in the shape of a fork in two semicylindrical jaws forming the hollow plunger and the space between these jaws is dimensioned so that they are arranged over the one on the other arm Spreader are pivotable and enclose it in the end position.

The new and advantageous feature of this device is that the hollow plunger and expansion body work together with a pliers tool, namely in that the hollow plunger and tool are used for gripping and inserting
of open, resilient retaining rings

Applicant:

Waldes Kohinoor, Inc.,

Long Island City, N.Y. (V. St. A.) '

Representative:

DipL-Ing. EG Ottens, patent attorney,
Munich 23, Leopoldstr. 33

Named as inventor:

Hans Erdmann, Maplewood, N. J. (V. St. A.)

Claimed priority:

V. St. v. America dated June 2, 1959 (817 668),

of August 21, 1959 (835 222) for claims 4 to 8

Spreading body attached to the ends of the tong arms in a departure from conventional pliers were, which made it possible to arrange the swivel arms in one handle, the possibility creates a convenient system for the operator. It is also advantageous when Device according to the invention that there is the possibility of picking up the rings with the tool itself, so that it is not necessary to place the ring on the expansion body by hand. This advantage occurs especially when numerous rings have to be assembled quickly and cannot or should not use a power-driven device.

In one embodiment of the invention, the expansion body is with its arm through a narrow Web connected, which can enter the gap between the ends of the locking ring. Through this Measure, the guidance of the locking ring is improved. According to the invention, the expansion body can also be provided with bevels, which facilitate its entry into the opening of the locking ring.

In another embodiment, the expansion body is provided with a plate-shaped head piece and an adjoining web is formed, which from top to bottom 'through inclined lateral Transition areas increases in thickness, so that the diameter of the safety device pushed over the web

709 609/140

ring ring expands to the diameter of the workpiece. In this embodiment the guidance of the locking ring is further improved by cleverly arranged transition surfaces. Between the jaws of the hollow plunger can be provided with a flat rib arranged with play be that protrudes downward beyond the hollow plunger and the lower edge either in the direction of the Annular gap or in the direction perpendicular to it can enter the ring opening. This measure prevents that the closing of the arms may be disturbed by the lower edge of the rib. The edge of the rib extending in the direction of the annular gap can be lengthened so that it can enter the annular gap. Furthermore, according to the invention, the lower edge of the rib can have a projection have, which when pivoting the arms of the tool into a corresponding recess of the expansion body occurs. These measures are intended to reduce the risk of any malfunction exclude with certainty. Finally, the expansion body can have diametrically opposite projections have, for the purpose of better alignment of the device and the locking ring over the workpiece are slidable.

The invention is explained below with reference to drawings of several exemplary embodiments; it is

F i g. 1 the perspective view of an embodiment,

Fig. 2 is a side view on a larger scale, partly in section,

F i g. 3 shows a partial view of the expansion means after a ring has been picked up,

F i g. 4 is a section along line 4-4 of FIG. 2;

F i g. 5 is a partial side view showing the tool in the closed position immediately after FIG Shows assembly of a ring;

F i g. 6 shows in perspective the position of the tool when gripping a ring;

F i g. 7 and 8 are side views of a somewhat modified embodiment;

F i g. 9 is a top plan view of another embodiment;

Fig. 10 is a side view, partly in section; F i g. 11 is a front view of this embodiment;

Fig. 12 is a partial side view showing the tool picking up a ring;

F i g. 13 is a similar view showing the tool unmittalbar after assembly ^- a ring;

F i g. 13 A and 13 B show the end of the pick-up blade in side view and in plan view, respectively;

Fig. 13C is a section on line cc of Fig. 13A;

14 to 16 correspond to FIGS. 9 to 11, but show a somewhat different embodiment of FIG Pick-up belts; .... -

Fig. 15A is a section along line aa of Fig. 15;

Figures 17 to 21 correspond to Figures 9 to 13 but show a further embodiment;

Fig. 18A is a section along line aa of Fig. 18;

F i g. 22 is a partial perspective view, and FIG. 23 is a plan view of the working end of the arm, which has the expansion cone.

The in Fig. 1 to 6 shown tool 10 has two arms 12,14 ,, of which the arm 14 immovable on the hollow handle 16, z. B. by rivets 18, while the arm 12 is arranged to this Ann 14 about the axis 20 pivotable. A spring 22 holds the arms in a spaced, open position. The arm 14 is bifurcated, while the arm 12 has a rectangular cross-section and is dimensioned so that it is in the fork of the

ίο Armes 14 finds space (Fig. 5). The working end of the arm 12 is designed as an expanding mandrel for the ring in that it has a frustoconical head 24 , the smaller diameter of which is arranged at the top. This upper part has a diameter which is slightly larger than the inner diameter of the ring to be assembled, and the truncated cone then increases to a diameter which corresponds approximately to the diameter of the workpiece.

To make it easier to pick up the ring, the upper edge of the truncated cone 24 is beveled slightly so that, as shown in FIG. 3, the diameter of this beveled portion 26 at the top is slightly smaller than the inner diameter of the ring R. The ring is shown in FIG. 3 is shown in dashed lines in its untensioned state and in full lines in a somewhat spread state. The depth of the bevel 26 is advantageously somewhat smaller than the axial thickness of a ring. The ring can either be put on by hand and gently pressed on in order to achieve a slight expansion, or the tool can, as in FIG. 6, upside down and pushed into the ring opening.
The frustoconical head 24 is connected to the arm 12 by a thin web 28 , the width of which is dimensioned such that it can enter the gap between the free ring ends. As shown in Fig. 4, the upper part 28 a of the web 28 is preferably double-wedge-shaped. As a result, the web has some play in the annular gap, which helps when gripping the ring and also allows the web to be produced with dimensions that are not too precise.

The arm 14 ends in 'semi-cylindrical jaws 30 a, 30 b, which together form a hollow plunger 30 . The two semi-cylindrical parts are somewhat resilient in the radial direction, so that they can yield somewhat when they are pushed over the truncated cone 24. When this happens, press the lower edges 32 a, 32 b on the surface of the ring and spread it over the frustoconical head to the diameter of the workpiece.

F i g. 7 shows an arrangement in which the arms 42, 44 act like crossing legs of a pair of pliers. The arm 42 is fixed immovably on the handle 46 , while the arm 44 is arranged to be pivotable thereto. In Fig. 8, the arm 52 is attached to the handle 56 , and the arm 54 lies almost entirely outside the handle 56. This arm can be provided with a finger piece to facilitate the closing of the tool.

In Fig. 9 to 13 a further embodiment is shown, which has the advantage that turning over of the tools between picking up the ring and the actual assembly process is required. This is achieved in that the pick-up means do not, as in the previous embodiment, be connected to the frustoconical part of the tool, but to the

Claims (1)

arm serving as a hollow ram. The tool has, similar to before, arms 60, 61, the arm 61 being fastened with its rear end to the handle 62, while the arm 60 is pivotable about the axis 63. The arms are spaced apart by a spring 64 In the (open) position, they can be moved towards each other until they assume a closed position The hollow tappet for the ring, generally designated 68, consists of the jaws 68a, 686, which are designed similarly to the hollow tappet 30 of the first exemplary embodiment: As shown in FIG 13, the truncated cone 66 can be placed axially onto the end of the shaft S or another workpiece. The ring is then spread with the jaws 68a, 686 over the truncated cone 66 Snaps into place. In this exemplary embodiment, a gripping member for the ring is also arranged on the arm 61, which element serves to grasp the ring to be mounted from a horizontal surface or - as indicated in FIG. 12 - from a ring dispensing device. This gripping member is attached to the arm 61 with the rear end of its arm 70 and has a flat rib 72 at its free end between the jaws 68 a and 686, the lower edge of which protrudes downward beyond the hollow plunger 68. This edge is slightly greater in length than the inner diameter of the ring to be assembled and can therefore be pressed into the ring opening at diametrically opposite points so that the rib 72 can grip the ring with friction and hold it in the correct position for assembly. In order to facilitate the entry of the rib lower edge 72 c into the ring opening, the side edges of the rib 72 can be slightly beveled, as indicated at 73 a, 736. The length of the rib can also be chosen so that it can enter the gap in the ring. This extension can have beveled side surfaces 74 a, 746 at the bottom and be so thick that it spreads the annular gap somewhat. The rib 72 can even be designed in such a way that, after being inserted into the annular gap, it spreads the ring so far that further spreading means, such as the truncated cone 66, are not required. In order to prevent proper closing of the arms 60, 61 from being disturbed by the lower edge 72c of the rib 72, the truncated cone 60 is provided at its upper end with a slot 75 (FIG. 11) into which the rib 72 can occur. Since the arm 70 is advantageously made of resilient material, the rib 72 will, after reaching the bottom of the slot 75, deflect upwards as the closing movement of the arms 60 and 61 continues, as shown in FIG. 13 is shown. When a ring R, which is seated in the recess 77 of a ring dispenser (FIG. 12), is to be mounted, the tool is brought with spread arms into a position in which the hollow ram 68 and the rib 72 rest over the ring. The gap in the ring is aligned with the web 65. When the arm 61 is lowered, the rib 72 enters the annular opening and the annular gap (Figs. 13A, 13B). This happens before the hollow plunger 68 is pressed onto the ring. After the ring is held by the tool in this way, it is lifted off and brought over the workpiece S. The expansion cone 66 is placed on the workpiece, and the arms of the tool are moved towards one another. This movement first brings the ring from the rib 72 to the upper surface of the truncated cone 66 and then moves it, spreading further over the workpiece into its annular groove. 14 to 16 show a modification of the tool according to FIGS. 9 to 13. In this embodiment, the arm 70 a of the pick-up element 68 has a widened free end 72 a, which extends transversely to the ring opening. The width of the finger 72 a is chosen so that the side edges grip the inner edge of the ring with friction. Entry into the ring opening can be facilitated by chamfering the side edges at 73χ, 73y (FIG. 15A). In the embodiment according to FIG. 17 to 23, the arrangement of the tool arms 80, 81 and the hollow socket 83 is the same. Instead of the frustoconical expansion head, however, an expansion body 84, 88, 90 is used, which in part has the shape of a rectangular plate 84 with a recess 85 at its upper edge and a recess 86 at its lower edge. The latter is used to pick up the end of the workpiece. From Fig. 18, 19 and 22 it can be seen that the web is narrow at the top at 88 and wide at the bottom at 90 and is thicker from top to bottom due to inclined lateral transition surfaces 92 a, 926. The distance of the web 88.90 from the front edge of the expansion body part 84 is selected so that the projections located at the free ends of the locking ring are spread over this web until the ring can be pushed over the workpiece. This exemplary embodiment naturally also has an arm 94 with a rib 95. The rib has a protrusion 96 which fits into the recess 85 to bring the rib 95 into proper relationship with the expansion body 84, 88, 90. The tool in this form works in the same way as that of the previous embodiment. Patent claims: 1. Tool for gripping and inserting open, resilient circlips in ring grooves of shafts or similar rod-shaped workpieces using a hollow ram, through which each circlip can be placed axially on the end face of the workpiece Expansion body, which has a diameter that increases up to the diameter of the workpiece, axially displaceable and thereby expandable, characterized in that the hollow plunger (30; 68; 83) and the expansion body (24; 66; 84) at the free ends of about a hinge axis (20) like tong legs against each other pivotable arms (12, 14; 42, 44; 52, 54; 60, 61; 80, 81) are arranged, of which the an arm (14; 42; 52; 61; 81) is firmly connected to a handle (16; 46; 56; 62) in which the other arm (12; 44; 54; 60; 80) is pivotably mounted about the hinge axis (20), furthermore one arm fork-shaped into two semicylindrical jaws (30 a, 306; 32 a, 326; 68 a, 686) expires and the intermediate