Abstract
A vacuum nozzle system has a vacuum nozzle with an inlet opening for engaging a surface to be vacuumed and an outlet opening for connection to a vacuum supply hose. The inlet opening is delimited by a circumferential end face. The nozzle defining a vacuum flow direction from the inlet opening to the outlet opening. A holder bracket has a holder for holding the nozzle. The holder is disposed downstream of the end face in a vacuum flow in the vacuum flow direction when the nozzle is in a retained position on the holder bracket.
Claims
1. A vacuum nozzle system, comprising: a vacuum nozzle having an inlet opening and an outlet opening for connection to a vacuum supply hose, said inlet opening being delimited by a circumferential end face, said end face for engaging a surface to be vacuumed, said nozzle defining a vacuum flow direction from said inlet opening to said outlet opening; and a holder bracket having a holder for holding said nozzle, said holder being disposed downstream of said end face in a vacuum flow in the vacuum flow direction when said nozzle is in a retained position on said holder bracket.
2. The vacuum nozzle system according to claim 1, wherein said nozzle has an inner wall defining a nozzle surface profile, said holder is constructed as a tongue with a circumferential tongue surface profile that matches said nozzle surface profile to seal said nozzle to said tongue when said nozzle is in the retained position.
3. The vacuum nozzle system according to claim 2, wherein said nozzle surface profile is smooth and free of any protrusions.
4. The vacuum nozzle system according to claim 1, wherein said end surface is provided with notches therein for allowing a bypass of vacuum between the nozzle and a surface to be vacuumed.
5. The vacuum nozzle system according to claim 1, wherein said nozzle has a curved section in a longitudinal direction of said nozzle, said curved section has a structural rib on an external surface of said nozzle, said rib extends longitudinally on said nozzle.
6. The vacuum nozzle system according to claim 5, wherein said structural rib is multiple ribs disposed on an inside and an outside of a curve of the curved section.
7. The vacuum nozzle system according to claim 2, wherein said nozzle surface profile has taper in the flow direction and said tongue surface profile has a matching taper in the flow direction, said tapers ensuring a reliable seal of the nozzle to the tongue as said nozzle wears over a service life thereof.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0014] FIG. 1 is a perspective view of a claw according to the Prior Art;
[0015] FIG. 2 is a perspective view of the claw of FIG. 1 and a holder according to the Prior Art;
[0016] FIG. 3 is a perspective view of an embodiment of the vacuum claw system;
[0017] FIG. 4 is a top view of the vacuum claw system;
[0018] FIG. 5 is an end view of the vacuum claw system;
[0019] FIG. 6 is a side view of the vacuum claw system;
[0020] FIG. 7A is a section view of the vacuum claw system of FIG. 3 at the holder/claw interface;
[0021] FIG. 7B is a section view of the vacuum claw system of FIG. 3 at the holder/claw interface;
[0022] FIG. 8 is a perspective view of the claw of FIG. 3;
[0023] FIG. 9 is a top view of the claw;
[0024] FIG. 10 is an end view of the claw;
[0025] FIG. 11 is a side view of the claw;
[0026] FIG. 12 is a perspective view of another embodiment of the claw;
[0027] FIG. 13 is an end view of the claw of FIG. 12; and
[0028] FIG. 14 is a perspective view of the holder bracket;
DETAILED DESCRIPTION OF THE INVENTION
[0029] In all the figures of the drawing, sub-features and integral parts that correspond to one another bear the same reference symbol in each case.
[0030] Referring now to the figures of the drawings in detail and first, particularly, to FIGS. 3-10, there is shown a vacuum claw or nozzle 10 for a vacuum claw system 100. The vacuum claw 10 has an inlet opening 11 and an exit opening 12 for connection to a vacuum hose that is connected to a central vacuum system. The inlet opening 11 has a circumferential end surface 15 that is an end of the claw 10 and delimits the inlet opening 11. The claw 10 has a curved portion 13 that extends along a longitudinal direction of the claw 10 from the inlet opening end of the claw 10 when viewed from the side. The claw 11 is provided with external ribs 14 extending along the curved portion 13. The external ribs 14 are provided on the inside and outside of the curve of the curve portion 13. The provision of the external ribs 14 eliminates the need for internal stiffeners in the flow channel and results in a smoother transition of vacuumed objects passing through the claw 10.
[0031] As shown best in FIGS. 3 and 14, the vacuum claw system 100 has a holder bracket 30 constructed for mounting to a substrate structure, the holder bracket 30 retains the claw 10 when not in use. In a claw retained position on the holder bracket 30, the holder bracket 30 has a holder 31 that is disposed within the claw 10 downstream of the end surface 15, with respect to an airflow direction F through the claw 10 resulting from vacuum applied at the exit opening. That is the flow begins at the inlet opening 11 and moves to the exit opening 12 where the exit opening 12 is downstream of the inlet opening 11 in regard to the flow direction. The holder 31 is defined by a tongue 31 that is received inside the claw 10 at the inlet opening 11. The tongue 31 has a circumferential surface profile 33 that matches the surface profile of an inner wall 16 (FIG. 7) of the claw 10 inside the claw 10 downstream of the end surface 15 so that the outer circumference of the tongue 31 seals against the inner wall 16. The circumferential surface profile 33 of the tongue 31 has a taper or draft angle in a longitudinal direction thereof (size reduces in the flow direction). The surface profile of the inner wall 16 has a corresponding (same) taper or draft angle in the longitudinal direction. The matching tapers of these surfaces ensures a reliable seal inside the nozzle 10 between the nozzle 10 and the tongue 31 even as the end surface 15 wears dramatically (up to an inch). As such, relationship accommodates wear of the end surface 15 of the claw 10 without a negative effect on the sealing between the tongue 31 and the claw 10. This results in not adding noise pollution from the nozzle and not adding load on the vacuum system from losses and maintains suction power in other nozzles of the central vacuum system that are in use.
[0032] The base of the tongue 31 may be provided with a shoulder 32 that has a height relative to the tongue 31 that matches the depth of the end face 15 along the insertion direction of the claw onto the holder, also referred to herein as the “depth” at the position of the shoulder 32 about the circumference of the end face 15. Particularly, as seen in the cross section of FIG. 7, the height is more prominent (prouder) at a side of the claw that is on the inside of the curve than on a side of the claw that is on the outside of the curve to correspond to the depth at the corresponding location.
[0033] Applicant found that the implementation of the tongue 31 inserted into the claw 10 and engaging the inner wall 16 has several benefits. Firstly, the suction of the vacuum through the claw 10 provides for the claw 10 to seal onto the tongue 31, as the tongue 31 has a mating taper to the inner surface 16 of the inlet end of the claw 10, which closes off escaping air flow and thus solves the problem, associated with continuously running central vacuum systems, of whistling noise pollution common in existing claw holder brackets. Furthermore, the fact that the tongue 31 engages the inner wall 16 of the claw 10 allows for the claw 10 to have a notched or stepped circumferential end surface 15, as shown in FIGS. 12 and 13 and allows for the claw 10 to wear at the end surface 15 without change to the performance of the claw system 100. In particular, the sealing occurs inside the claw 10, downstream of the end surface 15. As such, the system can accommodate any abrasions, uneven wear or damage to the end surface 15 during regular use of the nozzle 10 over its lifetime. In other words, contrary to a holster type holder, the profile or smoothness of the end surface 15 does not have a detrimental effect on the system. Furthermore, the tongue 31 also provides for the claw 10 to be securely held by the holder bracket 30 even when the vacuum is turned off. It is pointed out that the end surface 15 is the face of the claw 10 that engages against the object/surface to be vacuumed. The notched end surface 15 provides gaps for an air flow to pass into the claw 10 between the claw 10 and the surface that is being vacuumed and prevents the claw 10 from sucking down onto the object being vacuumed, as is common problem in traditional claws. This air flow bypass provides the benefit of the claw 10 not getting stuck on the object vacuumed and thus is easier to advance along the surface of the object being vacuumed. This is especially beneficial when vacuuming flexible material such as fabrics, carpets, or seating surfaces of natural or synthetic materials. The notched or stepped end surface 15 can be provided as spaced notches 17 in the end surface 15 around the circumference of the inlet opening 11.
