DE2217123B2 - Shear linkage for cash register cover - enables housing to be lifted and hinged away - Google Patents

Abstract

The link mechanism is used e.g. when a cover is to be placed with its rim in a groove which runs round the edge of a housing. The link mechanism consists of two crossed links, which can hinge at its cross over point (7). The short ends (8) of the links hinge about points, one of which is mounted in the housing (1) while the other is mounted in the cover (2). The ends of the long parts of the linkages are slotted. The slotted links fit over pins which are mounted respectively in the cover and the housing. Due to the slotted sections of the links, the cover can first be moved away from the housing before it is hinged out of the way.

Description

The turn relates to a Schcrcngclcnk to connect the pivotable and the fixed Housing part of a self-cashier, for example a pay phone, the sloping edges of which according to Art of groove and leather interlock.

Are known scissors-shaped lever mechanisms for parallel guidance of two bodies, the two Legs of the scissors are connected by a pivot pin. The ends of the legs are at the simple scissors rotatably mounted on one side, on the other side they have to be arranged so that they can be moved to make the scissors functional. The two bodies (housing parts, slide, etc.) can then perpendicular to the direction of displacement of the two guide pins straight apart or to each other move.

However, such Bewcgungsmoglichkcit is not satisfactory for many device housings / .. B. of machines, electrical or telecommunications equipment, which is why hinges such as wrist straps or piano straps are used here to be able to swivel open the front part of the device. However, there are occasions in which the use of such hinges is associated with serious disadvantages for the safety of the device. This is especially true for self-checkers, whose cash register is an incentive for break-ins. Hinges and abutting edges of the housing parts are good points of attack for such experiments.

The aim of the invention is to address the described disadvantages of both the scissor mechanism and the hinges avoid. Her job is for the housing of one Self-cashier. whose two housing parts interlock with the edges like tongue and groove to the To further reduce opportunities for burglary tools, to provide a Schercngelcnk that a Uninhibited pivoting of one part of the housing is allowed. According to the invention, the object is thereby achieved solved that the arranged inside the housing Scherengelcnk formed by two identical legs is, which by the common pivot pin in each case a lever arm of constant length and a lever arm variable length are divided, the lever arm constant lunge by the common pivot and a pivot attached to the one housing portion and the variable length lever arm the common pivot and one on the

other housing part attached, guided in an elongated hole of the leg guide pin is limited. With this solution, the advantages of both types of opening (scissor gear and hinge) are combined, so that it is possible to create tightly interlocking edges of the

Provide housing parts on the entire circumference, since the housing part initially separated linearly when opening and then swiveled or swiveled when closing and then just brought together. More interlocking The edge and the internal joint ensure the greatest possible security against break-ins.

Depending on the desired maximum opening angle of the two housing parts, the legs are either straight or curved. In the latter case, the housing can be opened wider than when straight legs are used. The invention is explained in more detail below using an exemplary embodiment with the aid of a drawing. The K i g. 1 to 1 of the drawing show a schematic cross section of the two housing parts with which they connect the scissor joint in three opening stages:
F i g. 1 when closed.
Fig. 2 in a slightly open state, so that the two housing parts are just separated from each other,
F i g. 3 when fully open.

In the figures, the stationary housing part is designated by 1, the pivotable part by 2. The abutting edges Both housing parts are designed so that they interlock like a tongue and groove. So that will achieves that the housing offers little opportunity for burglary tools.

In the example shown, the stationary, i.e. the im generally attached to a wall housing part 1 provided with a circumferential groove 3, which on the housing part molded or attached, for example welded.

is riveted, etc., depending on whether the housing is made of plastic or sheet metal and which one Fastening can be realized more rationally. The edge of the pivotable housing part moves into the groove 3 2 when closing. Of course this can

Principle can also be applied the other way around, i.e. This means that the groove 3 on the edge of the pivotable housing part 2 is arranged and engages over the edge of the stationary part 1 in the closed state.

Since the groove prohibits the use of conventional hinges such as wrist straps or piano straps, the movable connection of the two housing parts 1 and 2 a pivot joint 4 is used, which is so inside the housing can be attached so that it is neither accessible nor visible from the outside when closed.

The shear joint 4 is of two equal parts, the one in Fig. 1 by dash-dotted lines in outline indicated legs 5 and 5 ', which are rotatably connected to one another by a pin 7.

The pivot 7 divides each leg into a two-armed lever, one lever arm 8 or 8 ' having a fixed length b and the other lever arm 9 or 9' having a variable length n .

The constant length b of the lever arm 8 or 8 'is equal to the distance of the common Drehz.aptens 7 from that in the housing part 2 or! attached pivot pin 10 or 11. The length .7 is designed to be variable in that the lever arm 9 or 9 'is provided with an elongated hole 6 into which a slide / pin 12 or 13 attached to the housing part 1 or 2 engages.

In the closed state of the housing (Fig. 1), the lever length ; i is the same or slightly larger than b, since this means that the housing parts are hardly pivoted when opening, but rather are guided parallel or almost parallel to each other due to the small scissor angle (K i g. 2). so that the pivotable housing part 2 cannot jam in the groove 3. When opening further, the sliding pegs 12 and 13 move outward in the elongated holes β, the length; i increases more and more, while the pivoting radius of the housing part 2 becomes smaller and smaller, until the sliding pegs 12 and 13 at the ends of the elongated holes 6. ^Λ -5

The housing is now completely open (K i g. 3). the two housing parts I and 2 close an angle of about 135 a. 13ei corresponding angled or curved legs 5 and 5 'can be tier Öllnungsu Increase the angle to approximately 180 '.

The pivot pins 10 and 11 are fixed in place near the side of the housing on which the edge of the pivotable housing part 2 describes the small arc, while the position of the sliding pegs 12 and 13 V) IH desired opening angle and possibly from the Length of the \ ariable lever arm 9 or 9 'depends. Training has proven to be advantageous in which im closed state of the housing of the lever arm 8 or 8 'of constant length shorter than or equal to that Lever arm 9 or 9 'is of variable length

List of reference symbols used

1 stationary housing part

2 swiveling housing part

3 groove

4 scissor joint
5, 5 'legs

6 elongated hole

7 pivot pins
8.8 'lever arm
9.9 'lever arm

10 pivot pins

11 pivot pins

12 sliding pegs

13 GHt cones

Report on the publications
to the state of the art

Publications considered in the registration:

O. Ri c h Ut. R. \. Voss. K ". Ko / cr:" Components the leinmechaniko. 8th edition. VKB Verlag Technik Berlin. | 9i9, page 453, figure SbJ3 and associated TeM

1 sheet of drawings

Claims (3)

't claims: 1. Scissor hinge for connecting the swiveling and the fixed housing part of a self-cashier. whose sloping edges interlock in the manner of tongue and groove, characterized in that the scissors joint (4) arranged in the interior of the housing formed by the two housing parts (1,2) is formed by two identical legs (5, S ') which are formed by the common pivot pin (7) is divided into a lever arm (8, 8 ') of constant length (b) and a lever arm (9, 9') of variable length (a) , the lever arm (8, 8 ') of constant length (b) by the common pivot pin (7) and a pivot pin (10, 11) attached to the one housing part (2, 1) and the lever arm (9, 9 ') of variable length (s) through the common pivot pin (7) and a glass cap (12, 13) attached to the other housing part (1, 2) and felt in an elongated hole (6) of the leg (5, 5) is delimited. 2. scissors joint according to claim 1, characterized in that the legs (5, 5 ') optionally are straight or curved. 3. A scissor joint according to claim 2, characterized in that the 1 lever arm (8,8 ') of constant length (b) in the closed state of the housing is shorter than or equal to the lever arm (9,9') of variable length (i) m.