DE9404121U1 - Work and assembly stand - Google Patents

Description

Work and assembly stand

own symbol; D 14. 12. DE 1 D 14. 22. DE 1 08.03.94

When working on workpieces, for example in metalworking, carpentry and interior work, work and assembly stands are often required on which the workpieces can be placed at the correct working height so that the workpieces and their individual parts can be placed in the correct order in relation to one another during the work to be carried out and the work itself can be carried out by the staff at an ergonomically favourable height.

Known workbenches generally have a supporting part that extends over the entire length, onto which the workpieces are placed, and two spreader feet on each end of the workbench. The two spreader feet on one side are connected to one another by struts that run parallel to the supporting part to form a one-piece frame part, with the top strut usually serving as the supporting part. The two frame parts are usually connected to one another in an articulated manner in the area of their supporting part, so that they can be set to a rest position in which they are a minimum distance from one another, and they can be set to an operating position in which their feet are a maximum distance from one another near the ground. Due to its design with two frame parts lying parallel to one another, the workbench has a thickness measured across the frames, even when folded up, i.e. in the rest position, that is at least equal to the sum of the thicknesses of the individual frame parts. This results in a considerable amount of space being required for storage and, above all, for transport in a vehicle.

A further disadvantage of these workbenches with ladder-shaped frame parts is that in the operating position they span a relatively large floor area and the space above is also only accessible to a limited extent and getting closer to the workpiece on the workbench is hindered.

In the operating position of the trestle, the frame parts must be held in a maximum spread position by one or more spread limiters for reasons of stability. These spread limiters are designed in different ways. A pair of handlebars is often used, the handlebars of which are connected to one another at one end and the other end of which is connected to one of the frame parts. These foldable spread limiters always pose an accident hazard when they are folded in.

In another known trestle, the supporting part is connected to a post at each of its two ends to form a base body. In addition, there is usually a strut between the two posts below the supporting part. For support in the operating position, there is a fork-shaped support leg with a pair of support feet in the middle of the lower strut, which is arranged on the strut so that it can pivot around a vertical axis. The two support feet reach down to the ground. In the rest position, the pair of support feet is aligned parallel to the strut and thus to the base body and is therefore practically within the outline of the trestle. For the operating position, they are pivoted in a plane that is aligned perpendicular to the plane of the base body of the trestle. Since these support feet are only located in the longitudinal center of the trestle in the operating position, the trestle has only limited stability, since the plan shape of the support points is a diamond, in which the support lines as connecting lines of the support points extend from the two

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Support feet run towards the posts on the front of the trestle. If a horizontal force acts on the supporting part of the trestle in the area of the front, a relatively large tipping moment occurs around the support line between the foot of the post and the corresponding support foot of the support foot pair located in the longitudinal center of the trestle. If the support foot pair in the middle of the trestle is not fully adjusted to the operating position or is not secured against swiveling back in the operating position, the stability of the trestle is reduced considerably again.

The invention specified in claim 1 is based on the object of creating a work and assembly stand which, in the rest position, has very small external dimensions for storage and transport and which, in the operating position, has good stability and at the same time offers good accessibility to the workpieces resting on it.

Because the support feet are each made up of a foot part and a support part, which are connected to each other and to the post or to the height-adjustable guide part on it, they can be folded very close to the base frame for the rest position and folded out to the maximum support position for the operating position. In the rest position, the space they require is hardly larger than that of the base frame alone. In the operating position, the support feet form four support points, which are located at the corners of a rectangle and which therefore ensure the greatest possible support width both in the lengthwise direction of the workbench and transversely to it, and thus also the greatest possible stability. Because the pairs of support feet are arranged in the plane of the posts aligned transversely to the base frame, the area between the posts remains free of parts that could impede access to the workpiece.

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A load on the supporting part is transferred directly to the ground by the vertically aligned posts without detours via joints or scissor-like frame parts. The support feet and their joints are therefore not involved in this force transfer. They only have to transfer the support forces resulting from horizontal force components, which are usually much lower than the forces from the main load that are transferred by the posts. This means that the support feet can be designed with relatively small cross-sectional dimensions and with a correspondingly low material expenditure. This in turn results in a relatively low dead weight for a given load-bearing capacity and a certain level of stability, in addition to small external dimensions, especially in the rest position.

In an embodiment according to claim 2, the space required by the support feet in the rest position is particularly small.

In an embodiment according to claim 3, the supporting forces are divided between two pairs of supporting feet with the same external space requirement, whereby these can either be made lighter or, with the same design, a greater supporting force can be absorbed and thus greater stability is achieved.

A further development according to claim 4 facilitates the joint handling of the support feet.

In an embodiment according to claim 5, the foot parts and/or the support parts can be manufactured in a simple and inexpensive manner by bending appropriate sheet metal cuts, whereby they also retain a relatively high dimensional stability. Nevertheless, their space requirement remains very small.

•i 5 ·&agr;

With a design according to claim 6, the trestle can also be set up on uneven floor surfaces without wobbling.

With a design according to claim 7, guide parts are created that are relatively simple and inexpensive to manufacture. This applies in particular when the guide sleeves are made from rectangular bore sections, the clear internal dimensions of which are matched to the external dimensions of the posts.

A design according to claim 8 creates a relatively simple and above all reliable locking device. A further development according to claim 9 makes it easier to operate the locking device.

In a further development according to claim 11 or claim 12, the locking devices on both posts can be operated, i.e. unlocked, simultaneously and with only one hand.

A further development according to claim 13 is particularly suitable for support feet in which the guide part on one post is not connected to the guide part on the other post by a strut or the like.

An embodiment according to claim 14 makes it possible to adjust the guide parts on both posts simultaneously with one hand.

The invention is explained in more detail below using some embodiments shown in the drawing. They show:

5 Fig. 1 is a side view of a first embodiment of the trestle, partly in the rest position and partly in the operating position;

Fig. 7 and 8th Fig. 9 and 10

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Fig. 2 is a front view of the trestle according to Fig. 1;

Fig. 3 is a partial and partially cutaway side view of the work stand with a locking device of a guide part with a modified actuating device; Fig. 4 is a partial and partially cutaway side view and 5 is a top view of the

Work trestle with a further embodiment of the actuating device;

Fig. 6 is a partial front view of the actuating device according to Fig. 4 and Fig. 5; a partial side view or top view of the work stand with a further embodiment of the actuating device; Fig. 9 is a partial side view

or top view of the work stand with another design of the operating device.

The work and assembly trestle shown in Fig. 1 and Fig. 2, which is referred to below as work trestle 10, has one post 11 and one 12 each, which are permanently connected to one another by means of a horizontally aligned strut 13. Both the posts 11 and 12 and the strut 13 are made from a rectangular tube section. In each of the two posts 11 and 12, an extension rod 14 or 15 is guided so that it can be moved longitudinally. They are also made from a rectangular tube section, the external dimensions of which are matched to the clear internal dimensions of the posts 11 and 12. The two extension rods are permanently connected at their upper end to a horizontally aligned support part 16, which forms the support part of the work trestle 10 on which the workpieces are placed and which is also made from a rectangular tube section.

The two posts 11 and 12 and the strut 13 form a base body 17 of the work trestle 10. The supporting part 16 and the

The two extension rods 14 and 15 together form an upper part 18 of the work stand 10, which is guided on it so that it is height-adjustable relative to the base body 17. Two locking devices 19 are provided for setting the upper part 18 to different height positions. These each have a locking bolt 21 which is guided longitudinally in a tubular housing 22 and is subject to the action of a return spring which presses it into its locking position. The locking devices 19 also have a number of recesses (not shown) which are arranged on the inside of the extension rods 14 and 15 at different heights in the alignment of the locking bolt 21.

Each unlocking device 19 is provided with an actuating device 23, which has a pivoting wing 24, which is connected to the locking bolt in a rotationally fixed manner and which interacts with a ramp surface 25, which is designed as an obliquely aligned front surface of the housing 22, along which the pivoting wing 24 slides during a pivoting movement and thereby moves the locking bolt back and forth in the axial direction.

On each post 11 and 12, a support leg 26 or 27 is arranged on each side, based on the front view according to Fig. 2.

Each of the support feet 26 and 27 has a foot part 28 and a support part 29. The foot parts 28 are connected at one end to the lower end section of the associated post 10 or 11 in an articulated manner. At their other end they are connected at one end of the associated support part 29 in an articulated manner. The other end of the support part 29 is connected at an articulated manner to a guide part 31, which is guided on the post 11 or 12 in a height-adjustable manner.

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The foot parts 28 and the support parts 29 each have a U-shaped cross-sectional profile. In the simplest case, they are made from a sheet metal cut by bending. The flanges of the U-profile are each facing the post and are arranged on both sides of the post in relation to the elevation according to Fig. 1. The web of the U-profile has a recess 32 in each end area of the foot parts 28 and the support parts 29 (Fig. 1 right), so that in this end area the flanges of the U-profile can at least partially overlap the post 11 or 12 and the guide part 31 (Fig. 2). The joint connection 33 between the foot part 28 and the post 11 or 12, the joint connection between the foot part 28 and the support part 29 and the joint connection 35 between the support part 29 and the guide part 31 each has a cylindrical joint bolt 36 which is inserted through circular recesses in the flanges of the U-profile of the foot parts 28 and the support parts 29 and through corresponding circular recesses at the lower end of the posts 11 and 12 and at a bolt receptacle 37 of the guide part 31. The position of the joint bolts is secured in the usual way by locking washers.

The guide parts 31 are designed as rectangular tube sections, the clear dimensions of which are matched to the external dimensions of the posts 11 and 12, on which they are guided in a height-adjustable manner. In the rest position of the support feet 26 and 27 (Fig. 1 right and Fig. 2 right) and in the operating position of the support feet 26 and 27 (Fig. 1 left and Fig. 2 left), the guide parts 31 are each locked by a locking device 38 (Fig. 1 left). These locking devices each have a locking bolt 39, which is arranged to be longitudinally displaceable in a tubular housing 41 and is subject to the action of a return spring, which exerts a force on the locking bolt 39 in the direction of the locking position. Each locking device 38 is coupled to an actuating device.

The actuating devices 42 can be designed in the same way as the actuating devices 23, by means of which the locking devices 19 acting between the posts 11 and 12 and the extension rods 14 and 15 guided in them are actuated.

In Fig. 1 and Fig. 2, these locking devices 38 and their actuating devices 42 are arranged on the outside of the guide parts 31 in relation to the side view according to Fig. 1. This applies in particular to a design of the work trestle 10 according to Fig. 1, in which the guide part 31 on the post 11 and the guide part 31 on the post 12 are rigidly connected to one another on their inside by means of a strut 43, especially if this strut is arranged approximately in the middle of the inside of the guide parts 31. If the strut 43 is not present or there is still sufficient space on the inside of the guide parts 31, the locking devices 38 can also be arranged on the inside of the guide parts, as is the case with the guide part 44 and its locking device (Fig. 3). The locking device itself is designed to be the same or at least similar to the locking devices 38 or 19, so that reference can be made to their explanation. The actuating device 46 is modified. It is formed by a ring eyelet 47 which is connected or coupled to the locking bolt 48. Instead of the ring eyelet 47, a disk-shaped or spherical actuating button can also be provided.

In the following, some modified actuating devices are explained with reference to Figs. 4 to 10, in which the locking devices are designed and arranged in the same way as or similar to the locking device 44.

In the actuating device 49 shown in Fig. 4 to Fig. 6, the guide parts 51 are

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Strut 52 is rigidly connected to one another, which is permanently connected to the guide parts outside the middle of the inside (Fig. 5), whereby this strut has been omitted in Fig. 4 for the sake of clarity. The guide bolts 53 of the locking devices 54 are provided with a flattened area on their rear end at least on one side, in which a circular through hole is arranged. A hinge bolt 55 is arranged in this through hole. By means of this, the locking bolt 53 is articulated to one end of a link 56 of the actuating device 49. The other end of one link 56 is also articulated to the end of the second link 57 facing it, which in turn is articulated to the locking bolt 53 of the second guide part 51. The length of the links 56 and 57 is dimensioned such that the locking bolts 53 coupled to them assume their locking position when the two links are in their extended position, which is shown in solid lines in Fig. 4. When the common joint 58 of the two links 56 and 57 is raised, as shown in dashed lines in Fig. 4, the distance between the two joints 59 between the links 56 and 57 and the locking bolts 53 coupled to them is shortened, so that the locking bolts 53 are pulled out of their locking position into a release position. In the release position of the locking bolts 53, the guide parts 51 can be adjusted in height, most easily by raising or lowering the strut 52 connected to them.

The operation of the actuating device 49 is made easier by arranging a handle 61 on the middle joint 58 (Fig. 4). Further facilitation can be achieved by arranging the handle 61 twice and by angling the handle part 62 outwards relative to the tab part 63, as shown in Fig. 6.

The actuating device 64 can be seen as a further modification in Fig. 7 and Fig. 8. The guide parts 65 are rigidly connected to one another by means of a strut 66, which is arranged at the lower end of the guide parts 65 in the side view and is located in the center plane of the guide parts 65 in the plan view.

The actuating device 64 in turn has two links 67 and 68, which are coupled to the locking bolts 69 of the locking devices 71. In the longitudinal center of the strut 66, on its top side, there is a bearing block 72 with a pivot pin 73, the axis of which is aligned vertically. A two-armed lever 74 is pivotally mounted on the pivot pin 73. One of the links 67 and 68 is connected in an articulated manner to each end of the lever 74. The length of the lever 74 and the two links 67 and 68 are coordinated with one another in such a way that in their extended position shown in Fig. 8, the locking bolts 69 coupled to them are in their locking position. The two-armed lever 74 is extended on one side to form an actuating arm 75, at the free end of which an actuating button 76 is arranged.

The two-armed lever 74 can be pivoted by means of the actuating arm 75, whereby the

Handlebars 67 and 68 are pulled towards the centre so that they in turn move the locking bolts 69 coupled to them from the locking position into their release position.
30

From Fig. 9 and Fig. 10, a modified actuating device 77 can be seen, which is particularly suitable for those embodiments of the work stand in which the guide parts 78 are not connected to one another by means of a strut.

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An actuating lever 84 is pivotably mounted on the housing 79 of the locking device 81 on a support arm rigidly connected to it by means of a pivot bearing 83. The locking bolt 85 is pivotally connected at its end facing away from the guide part 78 to one end of a tab 86, the other end of which is pivotally connected to the actuating lever 84.

The pivot bearing 83 is arranged outside the movement path of the locking bolt 85. From here, the actuating lever 84 extends outside the locking bolt 85 past it, with the articulated connection 87 between the tab 86 and the actuating arm 84 being located beyond the longitudinal axis of the locking bolt 85. When the actuating arm 84 is pivoted towards the side of the pivot bearing 83, the articulated connection 87 moves on a circular arc-shaped movement path that leads away from the housing 79 of the locking device 81. As a result, the locking bolt 85, which is coupled to the actuating arm 84 by means of the tab 86, is moved from its locking position into its release position. When the actuating arm 84 is released again, the locking bolt 85 is moved back into its locking position by its return spring, whereby the actuating arm 84 also returns to its original position.

In order to ensure that the trestle 10 can be set up without wobbling even on uneven ground, it is advisable to provide a foot plate 88 near the ends of the foot parts 28 facing away from the posts, which is connected to the foot part 28 in an adjustable manner by means of a threaded connection (Fig. 1 left and Fig. 2).

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In order to expand the application area of the workbench with regard to the size of the workpieces to be placed on it it is expedient if an extension 89 that can be folded up and down is provided at the height of the support part 16 on both of its outer sides.

List of reference symbols D 1 4 .·*22&idigr;··0&Egr;

10 workbench

11 posts

12 posts

13 Strut

14 Extension rod

15 Extension rod

16 Supporting part

17 Basic body

18 Top

19 Locking devices

21 locking bolts

22 Housing

23 Actuating device

24 pivoting wings

25 Ramp area

26 Support foot

27 Support foot

28 Foot part

29 Support part

31 Guide part

32 recesses

33 Articulated connection

34 Articulated connection

35 Articulated connection

36 hinge pins

37 Bolt holder

38 Locking device

39 locking bolts

41 Housing

42 Actuating device

43 Strut

44 Guide part

45 Locking device

46 Actuating device

47 Eyelet

48 locking bolts

49 Actuating device

51 Guide parts

52 Strut

53 Locking bolt

54 Locking device

55 hinge pins

56 handlebars

57 handlebars

58 Articulated connection

59 Articulated connection

61 Handle

62 Handle part

63 Tab part

64 Actuating device

65 guide parts

66 Strut

67 handlebars

68 handlebars

69 Locking bolt

71 locking devices

72 Bearing block

73 pivot pin

74 levers

75 Actuating arm

76 Operating button

77 Actuating device

78 Guide part

79 Housing

81 Locking device

82 Support arm

83 Swivel bearing

84 Operating lever

85 locking bolts

86 tab

87 Articulated connection

88 Adjustment plate

89 Extension

Claims (14)

--jyhsprüche 1. Work and assembly stand with the following features: - there are two posts (11; 12) which are aligned parallel to each other and arranged at a distance from each other, - there is a support part or at least one strut (13) which is aligned at right angles to the posts (11; 12) and is permanently connected to them and which together with the posts (11; 12) forms a base body (17),
- there is at least one pair of support legs, - - which can be set to either a rest position or a Operating position is adjustable, - - whose support feet (26) in the rest position have a minimum distance from the base body (17) and - - whose support feet (26) in the operating position have a minimum distance from the Base body (17) have a maximum distance, characterized by the features: - a pair of support feet (26; 27) is arranged on each post (11; 12) and is aligned transversely to the longitudinal extension of the base body (17), - each support foot (26; 27) has a foot part (28) and a support part (29), - - of which the foot part (28) is connected at one end to the Posts (11; 12) and at the other end is hingedly connected to one end of the support part (29) and - - of which the support part (29) is connected at one end to a end of the foot part (28) and at the other end is articulated to a guide part (31), - the axis of the swivel joints (33; 34; 35) of the support feet (26; 27) are aligned horizontally and parallel to the base body (17), - the guide part (31) is - - on the associated post (11; 12) between a rest position and an operating position and is height adjustable and - - by means of a locking device (38) in the rest position and in the operating position on the Posts (11; 12) lockable. 2. Work stand according to claim 1,
characterized by the features: - the foot part (28) and the support part (29) of a support foot (26) are arranged outside the elevation of the associated post (11; 12), - Preferably, at least in part of the articulated connections (33) the axis is located within the side view of the post (11; 12). 3. Work stand according to claim 1 or 2, characterized by the feature: - on each post (11; 12) a pair of support feet (26) is arranged on both sides in the elevation. 4. Work stand according to claim 3,
characterized by the feature: - the foot parts and/or the support parts which are arranged on the same side of the post in the side view are permanently connected to each other by means of a bracket or a strut. 5. Work stand according to claim 1 or 2, g e k e &eegr;&eegr; z,e i c h &eegr; e t by the feature: - the foot parts (28) and/or the support parts (29), which are arranged on the same side of the post (11; 12) in the side view, are formed by a single component with a U-shaped cross-section, - - where the flanges of the U-profile are facing the post (11; 12) and are arranged on both sides of the post (11; 12) in elevation and - - in which the web of the U-profile has a recess (32) matched to the post (11; 12) or the guide part (31) at least at the end that is articulated to the post (11; 12) and/or to the end that is articulated to the guide part (31). 10 6. Work trestle according to one of claims 1 to 5, characterized by the feature: - an adjustable foot plate (88) is present on at least one foot part (28), preferably on all foot parts. 7. Work stand according to claim 1,
characterized by the feature: - the guide parts (31) are designed as guide sleeves which are aligned with the outline of the post (11; 12) and surround it on the outside. 8. Work trestle according to claim 1 or 7, characterized by the feature: - each locking device (38) is - - by means of a guide part (31) perpendicular to the Displacement path of the guide part (31) longitudinally displaceably guided, preferably spring-loaded, locking bolt (39) and - - by one in the rest position and in the In the operating position of the guide part (31), a recess is formed on the post (11; 12) that is arranged in the alignment line of the locking bolt (39) and is matched to it. 9. Work stand according to claim 8,
characterized by the feature: - each locking device (38) is coupled to an actuating device (42). 10. Work trestle according to claim 9,
characterized by the feature: - the actuating device (46) is formed by a pulling element connected to the locking bolt (48), preferably in the form of a pulling knob or a pulling eye (47). 11. Work trestle according to claim 9,
characterized by the feature: - the actuating device (49) is formed by two links (56; 57) which are articulated at one end to one of the locking bolts (53) and at the other end to one another and/or to a handle (61). 12. Work trestle according to claim 9,
characterized by the features: - the actuating device (64) is formed by two links (67; 68) which are articulated at one end to one of the locking bolts (69) and at the other end to one of the ends of a two-armed lever (74), - the two-armed lever (74) is preferably pivotally mounted on a strut (66) which is permanently connected to the two guide parts (63), - the two-armed lever (74) is preferably connected to an operating arm (75) which, in the rest position, is preferably located within the side view of the base body (17). 13. Work trestle according to claim 9,
characterized by the feature: - the actuating device (64) has an actuating lever (84), - - which is pivotably mounted outside the movement path of the locking bolt (85) by means of a stationary pivot bearing (83) and - - which is articulated to the locking bolt (85), preferably by means of a connecting tab (86) articulated on both sides. 14. Work trestle according to one of claims 1 to 13, characterized by the feature: - the two guide parts (31) are rigidly connected to each other by means of a strut (43).