Loudspeaker mounting device with foot lock, encapsulated ball sleeve and height-adjustable threaded pin

Abstract

Device for setting up a loudspeaker housing, comprising (a) an elongated foot bar (1) which can be attached to the front and rear walls of the loudspeaker enclosure. (b) Fastening means (4) which force-fit the foot bolt to the front and rear wall and optionally provide a positive engagement in a transverse groove (3) of the front and / or rear wall, (c) wherein the fastening means engage screw-typely on countermeasures arranged in the housing structure, in particular on (i) a transverse nut (5) in the side wall of the housing, and / or (ii) Threaded inserts or counter-screw parts in the front or rear panel, (d) a threaded stud (6) with external thread which is screwed into a fine-thread internal bore of the foot bolt and which is adjustable from above by means of a drive engagement, (e) wherein the threaded pin has a conical surface (6a) on its outer side as a contact surface and a ball sleeve (7) inserted into the base is arranged below the pin, which accommodates three balls (8) on a circumferential circle with 120° divisions, (f) wherein each sphere is in contact with the conical surface, a base support of the sphere sleeve and a cylindrical inner wall of the sphere sleeve, (g) wherein the ball sleeve (7) is encapsulated and sealed and forms a lubricant reservoir (10), (h) wherein the force flow into the foot rail, when loads occur about the transverse axis, passes through the side walls, provided that the countermeasures of the foot rail fixing screws include a transverse nut in the side wall. (i) wherein the ball sleeve has an outer diameter D in the range of 10 mm to 20 mm and the ball diameters d K are chosen proportionally to D with a ratio of 0.30 ≤ d K / D ≤ 0.35 (j) and wherein the threaded pin has an axial internal thread for receiving a countersunk screw of nominal size M3 to M5 (11) acting from above, by which the pin is clamped against the foot bolt.

Description

Technical field

[0001] The invention relates to the mechanical setup of loudspeaker housings.

[0002] More precisely, it concerns a mounting device with a foot bolt running transversely to the housing, an encapsulated ball sleeve with three contact balls and a threaded pin adjustable from above for height adjustment with positive locking by means of a countersunk screw. State of the art

[0003] Common options include spikes with or without base plates, solid plinths, and multi-link feet with hard contact points. These solutions typically couple very rigidly and transmit housing vibrations directly into the floor; defined micro-movements with adjustable properties are not provided. Furthermore, foot assemblies are usually attached to the base plate at specific points; efficient transfer of the moments generated during pitching movements into the foot assembly is not guaranteed. Description of the invention Task

[0004] Provision of a compact, delicate mounting device that (a) enables high tilting and shear stiffness in forward / backward direction, (b) provides a reproducible, defined contact kinematics with adjustable damping, (c) is service-friendly and adjustable from the top (d) can be scaled to different loudspeaker masses. Solution

[0005] The mounting device consists of a transverse foot bolt that is attached to the front and rear panels of the housing. The attachment is either friction-fit without a groove or, alternatively / additionally, positive-locking via a transverse groove; countermeasures are provided by transverse nuts in the side panel and / or threaded inserts in the front / rear panel.

[0006] The foot bolt contains a threaded pin (fine thread) adjustable from above, the conical surface of which acts on three balls in an encapsulated ball sleeve; the balls contact the cone, the base of the ball sleeve and the inner wall of the ball sleeve.

[0007] The ball sleeve is sealed and forms a lubricant reservoir (oil bath operation possible). To prevent self-adjustment, the threaded pin has an axial internal thread for a countersunk screw acting from above, which clamps the threaded pin securely against the foot bolt.

[0008] The loads generated during pitching movements are transferred to the side walls or front and rear walls via the double-sided anchoring of the foot rail.

[0009] The balls are interchangeable and can be provided with different hardness / damping properties.

[0010] The size of the device scales, with the outer diameter D of the ball sleeve being proportional to the thickness t of the foot bolt.R corresponds to (D=t R ) and the ball diameters d K are chosen proportionally to D.

[0011] Preferred areas (numeric): Ball sleeves - 10 mm ≤ D ≤ 20 mm; d K / D = 0.30 - 0.35 ; Wall thickness of ball sleeve t H = 0.10 - 0.15 · D; Angle of conical surface of threaded pin 35° - 50° Example of implementation

[0012] In the preferred embodiment, the foot bolt (1) is inserted into a transverse groove (3) on the front and rear walls (2a) and screwed in place; the foot bolt fastening screws (4) engage in a transverse nut arranged in the side wall (2) and clamp the foot bolt. The threaded pin (6) (M5×0.5 as an example) is adjustable from above via a slot and is clamped against the bolt (1) by means of an M3 countersunk screw (11) in the axial internal thread. The ball sleeve (7) with D = 10 mm (D = t_R) is sealed by an O-ring (9) and contains a lubricant reservoir (10).

[0013] The three spheres (8) are arranged on a circumcircle. d K The / D dimension lies within the defined range, ensuring that contact stiffness and settling behavior remain comparable across the product series. The 45° cone angle limits the radial wall load of the ball sleeve. A hardened insert or a base plate can be provided for the base. Benefits / Effects • High tilting stiffness due to transverse anchoring on the front and rear walls • Reaction / acceleration forces generated by the chassis are introduced into the housing structure and transferred to the floor via the foot rails; a defined force flow path for loads around the transverse axis is provided for this purpose. • Reproducible contact kinematics through triple point contact (cone / ball / wall / floor) in an encapsulated unit with adjustable micro-friction and damping. • Ease of servicing: Adjustment from above, tensioning via countersunk screw; no lock nut required. • Scalability: D = t R , defined areas for D, d K , t H and cone angles ensure constant mechanical properties across different loudspeaker masses. • Optional fastening options: without transverse groove (force-fit) or with transverse groove (additional positive fit), each compatible with transverse nut in the side wall or with threaded inserts in front / back wall. • Protection of function: Encapsulation and reservoir minimize dust / dirt ingress and ensure the long-term stability of the friction / damping properties. List of characters • Fig. 1a: Three views of the device, foot bolt mounting in transverse groove Fig. 1b: Foot bolt mounted on the front and back wall • Fig. 2: Exploded and overview drawing of the front bolt with transverse groove / transverse nut • Fig. 3: Cross-section through the ball sleeve and foot bolt (section AA) • Fig. 4: Side wall with transverse nut / screw and the transverse groove of the front or rear wall (section BB) Reference symbol list 1 foot bolt 2. Case side panel 2a Front or back panel 3 transverse grooves 4 foot bolt fixing screws 5 cross nuts 6 threaded pin 6a Conical surface area 7 Ball sleeve 8 balls 9 O-ring 10 Lubricant reservoir 11 Countersunk screw 12 speaker enclosures

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