DE8017678U1 - SWIVEL CHAIR WITH FOOTREST - Google Patents

Description

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Dipl.-lng. Bodo THIELKING

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Dipl.-lng. Otto ELBERTZHAGEN _{TtlloXi o3aoao nnwll d}

CoslBOhfinkkonto: Han 309193-302 Registration number: 12 0619-

Dniunn: June 30, 1980

Applicant: Drabert Söhne Minden (Westf.), 4950 Minden, Wilhelmstrasse 11-17

Swivel chair with footrest

The invention relates to a swivel chair according to the preamble of claim 1.

For safety reasons, a work chair must have a climbing aid from a certain seat height the user can reach the raised seat without difficulty. When ascending it must be ensured that the upper part of the chair does not twist. When the footrest is connected to the chair upper part to form a torsion-proof unit is, the entire unit consisting of the chair upper part and footrest must not twist to avoid accidents to be avoided on the ascent. This makes a locking necessary, which for the different Phases of use of the chair must be served. To climb onto the chair, the rotatably mounted chair unit must must first be locked so that a firm stance is guaranteed during the ascent. After the user sits, he must release the lock so that he can pivot the chair into the working position. While

12 061a June 30, 1980

he has to lock the chair back in place so that it sits firmly and securely during the work process. Will the user leave the chair, he must repeat the process described in reverse order. The multitude described of operating steps leads to the fact that the user often takes the necessary steps for his safety neglects, for example, does not lock the swivel chair when climbing, and this is the cause of numerous industrial accidents.

Work chairs for elevated seating are in different Embodiments are known, for example it is known to arrange a foot ring or a foot plate on such chairs. There are also known chairs in which the distance between the footrests and the seat surface can be changed. Likewise, work chairs with footrests are known that can be pivoted either into a horizontal or vertical position are.

All of these different work chairs have the disadvantages outlined above.

The invention is based on the object of designing a chair of the type mentioned in the preamble of claim 1 so that the locking processes required for use automatically, d. H. without actuation of special ones intended for locking Controls takes place.

This object is achieved according to the characterizing part of claim 1.

The coupling provided according to the invention between actuation the footrest when loaded and locking the chair in the rotational position has the advantage that climbing the

12 061a June 30, 1980

Chair over the footrest serving as a climbing aid is not possible without the chair against during the ascent Rotation is secured. In addition, the new principle ensures that after climbing the chair, the lock can be unlocked by relieving the footrest, so that an intended pivoting movement at any time without actuation of complex adjustment mechanisms is possible. A locking of the upper part of the swivel chair is also desired Pivoting position, for example in the final working position, is easily possible.

In a preferred embodiment of the invention, the Locking elements designed as clamping elements. This has the advantage, among other things, that the swivel position is chosen continuously can be. In addition, the use of clamping elements can ß force depending on the on the Adjust the pressure force acting on the footplate. The clamping force is during the ascent process, during which the entire body weight of the user rests on the footplate, highest. After the chair user is seated, he can relieve the footplate and thus reduce the clamping force.

In a preferred embodiment of the invention, the The footrest is attached to the bracket so that it can pivot about a horizontal axis and the step surface is horizontal Position in the radial direction in front of the horizontal axis, while the area of the footrest facing the chair column acts directly or indirectly on a clamping element. Such a design has proven to be particularly practical proven.

In a further embodiment of the invention have the clamping elements on the one hand on the chair column, on the other

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12 061a

June 30, 1980

on the side of the clamping wedge resting against a pressure surface of the holder) on, which is pressed against the contact surfaces under load on the footrest.

Further embodiments of the invention are explained in the subclaims and in the description of the drawings below. ■,

In the drawings show:

Figure 1 -

Figure 2 -

Figure 3 -

Figure 4 -

Figure 5 -

a schematic overall view of a swivel chair according to the invention from the side, a first embodiment of the locking device, partly in section,

a second embodiment of the locking device, partly in section,

a side sectional view of a third embodiment of the lock, a view in the direction of arrow V according to FIG

The chair consists essentially of a normal, as a stable one Foot part formed lower part, a vertically and centrally arranged chair column 2 and a chair upper part 3 with seat 4 and movable backrest 5. The bracket is on a height-adjustable bracket on the chair column 2 Footrest 6 is mounted pivotably about a horizontal axis 7. The footrest has a step plate 6a and a lever area 6c, which extends from the horizontal axis 7 in the direction of the chair column 2.

The holder 25 is slidably guided on the chair column 2 via a slide bearing 0. The slide bearing 8 comprises the chair column 2 with two half-shells. A telescopic connection sits on the bracket 25, which forms part of the slide bearing, which consists of a tube 10, an eyelet 9 and a

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adjusting device 11 exists. The upper end of the sleeve 9 is attached to the upper part of the chair 3. By actuating the adjusting device 11, the distance H between the seat 4 and the footrest 6 can be changed and adapted to requirements. In the embodiment according to FIG. 2, the plain bearing designated as a whole by 8 consists of a plain bearing housing 8 'with a conically inclined clamping surface 8a ¹ . The clamping surface 12a ^{1 of} the clamping wedge 12 'rests on the clamping surface 8a ^1. Furthermore, the clamping wedge 12 ′ rests with its vertical surface 12b ¹ on the circumference of the chair column 2.

The lever area 6c has a pressure surface 6b with which it rests on the actuating surface 12d 'of the clamping wedge.

With its horizontal upper side 12c ¹ , the clamping wedge rests on a height-adjustable pressure plate 17 which can be adjusted by means of the adjusting screw 18. The adjusting screw 18 reaches through a threaded hole in the housing of the slide bearing 8 ¹ .

A locking pin 14 or a projection 13 hold the clamping wedge 12 'in its specified range of motion.

When the footrest 6 is loaded, it is pivoted on the step plate 6a the lever area 6c upwards and presses the clamping wedge 12 'between the clamping surface 12a via the pressure surface 6b and the circumference of the chair column 2. In this position, the slide bearing 8 is blocked.

The embodiment according to FIG. 3 corresponds essentially the embodiment according to Figure 2. Gieiche parts are with same reference numerals and analogous ones. Parts are denoted by the same reference numerals and two prime characters.

The lever area 6c carries an adjusting screw 26 between

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the clamping wedge 12 "and the clamping surface 8a" is a sliding plate 12 arranged. A return spring 15 designed as a compression spring presses the clamping wedge 12 ″ back out of its clamping position.

The drawing Figures 4 and 4a show a further embodiment, in which instead of a clamping wedge, a clamping roller with a Clamping cam 19 is provided with an eccentric clamping surface. The clamping cam 19 is on a horizontal bearing pin 20 pivotably mounted. The lever area 6c of the footrest 6 engages the lever attachment 19a via the adjusting screw 18 at. The attack leads to a pivoting of the clamping cam 19 and to a clamping of the slide bearing 8 on the chair column

Claims (14)

1. Swivel chair with a footrest that serves as a climbing aid is mounted and locked together with the upper part of the chair so as to be pivotable about a central chair column, thereby characterized in that the footrest is seated on a bracket that can be pivoted around the vertical chair column, which can be locked via locking elements that can be acted upon by the footrest. 2. Swivel chair according to claim 1, characterized in that the locking elements are clamping elements (12, 8; 20) are. 3. Swivel chair according to claim 1 or 2, characterized in that the footrest (6) about a horizontal axis (7) is pivotably attached to the holder (25) inä that the tread (6a) in the horizontal position in the radial direction in front of the horizontal axis (7), while the lever area (6c) of the footrest (6) facing the chair column (2) acts directly or indirectly on a clamping element (12; 20). 4. characterized in swivel chair according to one or more of claims 1 to 3, that the clamping elements have a one hand to the chair column (2) and secondly to a printing surface (8a ^1, 8a ") of the holder (25) adjacent the clamping wedge (12 *; ^{12 "), which is pressed against the contact surfaces (8a 1} ; 8a") under load by the footrest (6). III III «·» < · ■ »it it ι it η · 061 a June 30, 1980 5. Swivel chair according to one or more of claims 1 to 4, characterized in that the holder (25) has a sliding bearing (8) with a sliding bearing housing (8 ¹ ; 8 ") which the clamping wedge (12 ', - 12") and has a slope (8a ¹ ; 8a ") on one side surface, the slope of which corresponds to the slope of the sloping wedge surface (12a ¹ ; 12a"). 6. Swivel chair according to one or more of claims 1 to 5, characterized in that one Return spring (15) engages the clamping element. 7. Swivel chair according to one or more of claims 1 to 6, characterized in that the clamping element is held in its released position by a securing element (14; 13). 8. Swivel chair according to one or more of claims 1 to 7, characterized in that a sliding plate (16) is arranged between the inclined surface ( ^{8a ") of the slide bearing housing (8") and the inclined surface (12a ") of the clamping wedge (12 1)} . 9. Swivel chair according to one or more of claims 1 to 8, characterized in that the The clamping position of the clamping wedge (12 *) can be adjusted. 10. Swivel chair according to claim 9, characterized in that ^{a pressure plate (17) is provided over the upper surface (12c 1} ) of the clamping wedge (12 '), the position of which can be changed by means of an adjusting screw (18) screwed into ^{the plain bearing housing (8 1)} . • »■ it a« ··· m * itl Ii a · «·« • • I III «··· β «III II * · · · · 061 a June 30, 1980 11. Swivel chair according to one or more of claims 1 to 10, characterized in that the Footrest (6) on its side facing the chair column (2) has a shoulder designed to rest against the clamping wedge (12 ') (6b). 12. Swivel chair according to claim 11, characterized in that the approach consists of an adjusting screw (26) for the inclination of the footrest (6). 13. Swivel chair according to one or more of claims 1 to 12, characterized in that the footrest (6) is adjustable in height with the upper part of the swivel chair (3) is connected. 14. Swivel chair according to claim 13, characterized in that that between the holder (25) for the footrest (6) and the upper part of the chair (3) a telescopic extendable or retractable adjusting device (9, 10, 11) is provided.