Handles

The invention concerns handles and has particular, though not exclusive reference to handles for paint pads.

It is known in the art to provide a handle for releasable engagement with a channel formation mounted on or formed integrally with the body of a paint pad, the handle having a base plate which is a free sliding fit within the channel, the lateral edges of the plate engaging beneath inwardly directed lips at the longitudinal edges of the channel. In order to maintain the handle in position longitudinally of the channel it is known to provide protruberances at the underside of the plate which bear on the floor of the channel so to deform the channel as to urge the lips of such channel inwardly, thereby gripping the edges of the plate by pressure, such pressure being determined by the amount of deflection of the channel which in turn is controlled by the size of the protruberances.

Having regard to the nature of the materials from which handle and pad body are conveniently made, namely synthetic plastics materials, the rate of wear of the protruberances is such that on repeated application of the handle to and its removal from the channel the security of the attachment quickly deteriorates and the handle becomes loose in the channel, readily moving longitudinally thereof.

The primary object of the invention is to provide a handle for releasably attachment to a channel which is less susceptible to wear, and thus can be used more frequently, than is the case with conventional handles before requiring that the same be discarded and substituted by a replacement handle.

In its broadest aspect the invention proposes a handle arrangement for releasable engagement with a guide formation characterised by spaced lateral guide-engaging edges for cooperation with said guide formation and locking means pivotally mounted on this handle and selectively adjustable between first and second positions thereon respectively representing inoperative and operative conditions of this locking means, the said locking means including a part movable outwardly of the handle on adjustment between said first and second positions for surface co-operation with an opposed structure to urge the guide-engaging edges into frictional engagement with the guide formation.

According to another aspect of the invention there is provided a handle for releasable engagement with a lipped channel which handle comprises spaced opposed lateral edges for engagement with respective opposite longitudinal sides of the channel, a handle member extending from said edges and outwardly of the plane defined thereby and a locking means arranged in association with the handle member and selectively adjustable between a first, or datum, position wherein a part thereof is relatively retracted in relation to the general plane of the edges and a second position wherein said part is displaced outwardly from such plane.

According to a preferred feature, the locking means is mounted within the handle and includes an operating lever extending from said handle, the said operating lever being adapted, upon adjustment, to shift the aforesaid part between the first and second positions.

According to a still further feature of the invention, the said part of the locking means comprises a cam member operably connected with the handle for angular displacement upon adjustment of the locking means.

The invention will now be described further, by way of example only, with reference to the accompanying drawings illustrating two embodiments thereof and in which:

FIG. 1 is a side elevation, partly in section, of a handle as applied to a guide channel provided on the back of a paint pad body;

FIG. 2 is a plan view of the arrangement shown in FIG. 1; and

FIG. 3 is a side elevation, partly in section, of a preferred form of handle constructed in accordance with the invention.

Referring now to the drawings, and particularly to FIGS. 1 and 2 thereof, a handle 11 for a paint pad 12 comprises an aperture, generally rectangular base plate 11a having opposed lateral edges 11b, a hollow handle member 11c extending outwardly from the said base plate and in register with the aperture 11d therein, and a locking means 13 mounted within the handle member 11c and having an edge-cam member 13a adjustable between first and second positions wherein the effective cam surface 13a' of the cam member lies at one or other side of the plane of the underside of the base plate, respectively.

The base plate 11a and handle member 11c are conveniently of integrally moulded construction, being produced from a synthetic thermoplastics material, polyethylene or A.B.S. being the preferred material of choice, whilst the edge-cam member 13a is made from moulded nylon thereby to provide of a considerable resistance to frictional wear.

The locking means 13 is pivotably supported on and between two lugs 11e provided internally of the handle member 11c and in spaced disposition transversely of such handle member, such means comprising the cam member 13a aforesaid and a cranked manually-actuable lever 13b firmly attached thereto, the cam member 13a being of disc-like form and being rotatably mounted between the lugs 11e for motion about the axis of a support pin 13c engaged therewith, the support pin 13c being eccentrically positioned with respect to the cam member 13a.

An aperture 11f if provided in the top wall of the handle member through which cranked lever 13b of the locking means 13 protrudes, the lever 13b being movable to and from the position shown in FIG. 1 as indicated by arrow A therein.

In use in connection with a paint pad 12, the handle is positioned relative to the pad by engaging the lateral edges 11b of the base plate 11a with respective lipped longitudinal edges 14a of a guide channel 14 secured to the body of the paint pad, the base plate 11a being freely slidable in the guide channel 14 with the locking means 13 in an inoperative condition.

In order to secure the handle in a selected position longitudinally of the guide channel, the lever 13b is moved from the unlocked position (dotted lines in FIG. 1) to the locked position (full lines in FIG. 1) so that the effective cam surface moves downwardly through the plane of the base plate 11a into engagement with the bottom of the guide channel, the lever moving over-centre to reach the "locked" position thereby to be maintained automatically in such locked position with the cam surface in pressure engagement with the channel. The effect of the pressure engagement of the cam surface with the floor of the channel is initially to lift the base plate 11a of the handle outwardly relative to the channel so that the lateral edges of the base plate are moved into pressure contact with the lipped edges of the channel. A subsequent effect of the pressure engagement is to move the lips inwardly.

The action is described in more detail as follows:

The cam is so situated that with the handle engaged with the channel it falls to the centre of such channel. The channel, being of a resiliently flexible plastics material, is deformed in a downward direction when the cam is moved to the lock position and because the edges of the base plate of the handle are within the inwardly curved edges of the channel, the resulting pressure secures the handle to the channel. When the cam is moved to the lock position it protrudes approximately 1/4" below the level of the handle base plate and this amount is sufficient to draw the lips of the channel towards each other, thereby creating the required pressure to trap and securely lock the edges of the handle base plate.

To remove the handle, it is necessary only to release the locking means, (dotted-line position of FIG. 1) and slide such handle longitudinally off the guide channel.

As will be appreciated, as the cam member is, in effect, retracted whilst the handle is moved to and from its intended position, such cam member is not subjected to wear and thus the handle will have an improved life as compared with conventional handles of the kind before referred to.

In a preferred construction, see now FIG. 3, the handle 31 comprises a conically tubular hand-grip portion 31c which merges with an integral, generally frusto-pyramidal shaped housing 31g itself terminating in an outwardly directed peripheral flange 31b, the respective axes of the hand-grip portion 31c and housing 31g being mutually inclined at an angle of approximately 90.degree..

A slot 31f is provided in the forward wall 31g' of the housing in register with the longitudinal axis of the handle 31c, such slot 31f extending from a position immediately adjacent to the flange 31b to a position adjacent the uppermost extremity of the wall, which wall 31g', as can be seen from the drawing, being of curved construction when viewed in side elevation.

The opposed lateral side walls 31g" of the housing are each recessed to define a bearing for a cam member 33a pivotally supported on the housing 31g, the recess extending from the open end of the housing and comprising a convergent lead-in groove 31e and a bearing groove 31e'.

The locking means 33 comprises the cam member 33a aforesaid, such cam member consisting of an edge cam of generally oval plate-like form, there being axially aligned lugs 33c extending from the respective faces thereof for engagement with the bearing grooves 31e'. The cam member 33a includes a radially extending enlargement 33b, which enlargement engages the slot 31f in the housing 31g to protrude outwardly therefrom thereat to constitute a control member for angular adjustment of the cam member 33a about the axis of the aligned lugs 33c within limits defined generally by the ends of the said slot. The cam form includes a flat displacement portion 33a' co-operable with the floor of the channel 34 with which the handle is engaged when the cam member is in its locked position, as shown in dotted line in FIG. 3, and a clearance portion 33a" angularly spaced from such displacement portion and separated therefrom by a node 35, the displacement portion being spaced at a greater distance from the axis of the bearing lugs 33c, than the clearance portion, but at a lesser distance than the node 35, the clearance portion 33a" being disposed at the handle side of the plane of the plate defined by flange 31b in the "unlocked" condition of the locking means and the displacement portion 33a' being disposed beyond and parallel to such plane in the "locked" condition of the locking means.

The cam form includes a further node 36 generally diametrically opposed with respect to that node 35 between the displacement and clearance portions, such further node 36 constituting a stop for abutment with the inner surface of the housing, as shown in FIG. 3, in the "unlocked" condition of the locking means.

The operation of the embodiment shown in FIG. 3 corresponds to that of FIGS. 1 and 2, and no further description thereof is thought to be necessary.

The invention is not restricted to the exact features of the embodiment described and illustrated, since alternatives will readily present themselves to one skilled in the art.

Thus, for example, whilst we prefer that the locking means be provided internally of the handle member, an external mounting may be preferred in some instances. In other arrangements the cam member is provided within the handle member and the actuating lever therefor is arranged outwardly of such member.

As an alternative to the disc-like cam member disclosed, a pivotably mounted, cranked lever operating on a displaceable contact plate engageable with the guide channel may be adopted, the lever moving to an over-centre position in urging the contact plate into engagement with the floor of the channel.

Whilst, in the ordinary course of events, the handle will be engaged with a channel member and will be urged into contact with the underside of inwardly directed lips at the longitudinal edges of such member, it is to be borne in mind that a like guide effect is obtainable by providing upstanding lugs of inverted L-shape cross-section with which the lateral edges of the base plate of the handle, a plurality of spaced such lugs being provided for co-operation with each such lateral edge.