EP2217410B1

EP2217410B1 - Clamp for use with a workbench

Info

Publication number: EP2217410B1
Application number: EP08854138.8A
Authority: EP
Inventors: Matthew Spencer Collins
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2007-11-29
Filing date: 2008-12-01
Publication date: 2015-07-15
Anticipated expiration: 2028-12-01
Also published as: WO2009068693A3; EP2217410A2; WO2009068693A2; GB0723354D0

Description

The present invention relates to a clamp for use with a workbench arranged for use in performing 'do it yourself tasks.
When performing woodworking, metalworking or other do it yourself tasks it is common to make use of a workbench that provides a relatively large, but also sturdy work surface. Since such workbenches are typically not required for daily use it is desirable for them to be stowable in disassembled or folded-up form. It is also desirable that the stowed form is as compact as possible and that the time and effort required to translate the workbench from its stowed to in-use position be minimized.
WO 84/02102 discloses a clamp for use with a workbench comprising a clamp frame defining a frame member, a first clamp element defining a first clamping surface and a second clamp element defining a second clamping surface, wherein the first clamp element is in fixed relationship relative to the clamp frame and the second clamp element is movable relative to the clamp frame from a damped position to a clamp open position, in which the first and second clamping surfaces are spaced relative to each other to define an open clamp jaw therebetween.
The features of the preamble of claim 1 are known from WO2007/065919 . WO20071065919 describes a folding workbench that is stowable in highly compact form yet readily and safely unfolds with the minimum of time and effort to provide a relatively large and sturdy work surface. The workbench employs a central spine to which first and second primary work surface frames hingedly mount such that the primary work surface frames are foldable towards each other. Each of the first and second primary work surface frames hingedly mounts to the central spine by a distinct hinge mounting with each hinge mounting typically spaced horizontally from the other. In the folded configuration, the outer edges of the respective first and second primary work surface frames rest parallel with each other and each of the legs of the workbench rests parallel with a side edge thereof.
Applicant has now devised a clamp for use with a workbench such as that described in pending PCT Patent Application No. WO2007/065,919 , but also more generally of use with other workbench forms. The clamp allows for the convenient and ready clamping of various sizes and shapes of workpiece such as planks or blocks of wood.
It is an object of the present invention to provide a clamp for use with a workbench.
According to one aspect of the present invention there is provided a clamp for use with a workbench comprising
a clamp frame defining first and second frame arms arranged in spaced parallel relationship relative to each other;
provided to the clamp frame, a first clamp element defining a first clamping surface and a second clamp element defining a second clamping surface,
wherein the first clamp element is in fixed relationship relative to the clamp frame and the second clamp element is movable relative to the clamp frame in the direction of the first and second frame arms from a clamp closed position to a clamp open position, in which the first and second clamping surfaces are spaced relative to each other to define an open clamp jaw therebetween,
and wherein each of the first and second frame arms of the clamp frame includes a well-form portion that is positioned in the clamp open position to line up with said open clamp jaw such as to form a well-form support thereto.
There is provided a clamp for use with a workbench. The workbench may have any suitable form including those described in further detail herein.
The clamp comprises a clamp frame. The clamp frame defines first and second frame arms. The frame arms typically comprise straight, elongate elements e.g. of rod or box-like construction. The first and second arms of the clamp frame are arranged in spaced parallel relationship to each other and in embodiments, are provided with one or more cross-pieces therebetween. In embodiments, the clamp frame has a rectangular frame structure, of which the first and second clamp arms typically form opposing sides/edges thereof.
The clamp frame is provided with a first clamp element defining a first clamping surface and a second clamp element defining a second clamping surface. The first and second clamping surfaces are typically planar and arranged in opposing relationship to each other. The first and second clamping surfaces may be of a continuous nature or may in embodiments, be comprised of a series of surfaces (e.g. a series arrangement of blocks) that in combination form each of the first and second clamping surfaces.
The first clamp element is in fixed relationship relative to the clamp frame. That fixed relationship may for example, be defined by one or more fixing elements existing between the first clamp element and the clamp frame. In alternative embodiments, the first clamp element and the clamp frame comprise an integral form (e.g. co-moulded or co-welded) such that the fixed relationship inevitably arises from the integral nature of the overall form.
The second clamp element is movable relative to the clamp frame in the direction of the first and second frame arms. That is to say that the movement of the second clamp element is along the axis defined by first and second frame arms. Such movement of the second clamp element is typically achieved by the provision of a suitable mounting between the second clamp element and the clamp frame such as one that allows for linear movement (e.g. a slide mounting or a track and rail mounting).
The movement of the second clamp element is from a clamp closed position, in which the first and second clamping surfaces are unspaced relative to (e.g. adjacent to or abutting against) each other to define a closed clamp jaw therebetween, to a clamp open position, in which the first and second clamping surfaces are spaced relative to each other to define an open clamp jaw therebetween.
Embodiments are envisaged in which there exist intermediate 'open jaw' positions between the closed clamp jaw and (fully) open clamp jaw positions. In embodiments, such intermediate positions may be continuous or may be defined (e.g. pegged or latched) such that movement is from one defined intermediate opened clamp jaw position to another.
Each of the first and second frame arms of the clamp frame includes a well-form portion, which is suitably provided as an integral part of each of the first and second frame arms. That is to say, each of the first and second frame arms is shaped such as to define a well-form (e.g. well-shaped cut-out) portion therein and suitably integral therewith. Preferably, the location of each well-form portion is similar or identical for each of the first and second frame arms. The well-form portion may in embodiments, be arranged to define a flat base, which suitably defines a base plane that is parallel to the plane defined by the (non-well form part) of the relevant frame arm. The well-form portion may in embodiments, be arranged to define flat side walls that may in embodiments, extend vertically or be offset from the vertical such as to define a well-portion that fans out (e.g. tapers) from the base thereof.
The well-form portion of each of the first and second clamp arms is positioned such that in the clamp open position the well-form portion lines up with the open clamp jaw such as to form a well-form bottom support thereto. In more detail, the positioning of the well-form portion of each of the first and second clamp arms is arranged such that when a workpiece is placed within the open clamp jaw the well-form portions act as a well-form bottom support that acts to support that workpiece.
In embodiments, the well-form portions in combination define a support channel for the workpiece. Typically, the well-form portions are arranged such as to lie beneath the open clamp jaw. The extent (in the axial direction defined by the clamp arms) of the well-form portions may be arranged to correspond to the maximum open extent of the open clamp jaw or in embodiments, be somewhat less than that maximum open clamp jaw extent.
The provision of such well-form portions allows for the provision of a work-piece receiving support (e.g. channel) of greater depth than would be possible were the first and second clamp arms not to be provided with the well-form portions. This allows for clamped receipt of workpieces of greater depth than would normally be possible for clamps arranged for use with workbenches. The 'jaw capacity' of the clamp is thereby, increased.
Movement of the second clamping element relative to the clamp frame (e.g. along a mounting provided therebetween) is typically under the action of a movement control mechanism. The mounting typically allows for linear movement (e.g. a slide mounting or a track and rail mounting).
In embodiments, the movement control mechanism comprises a lock and release mechanism. Thus, when in a locked position movement of the second clamping element relative to the clamp frame is prevented, and when in a released position movement of the second clamping element relative to the clamp frame is enabled. In embodiments, that lock and release mechanism is responsive to user-actuable handles.
In embodiments, the lock and release mechanism comprises
a toothed rack, provided in fixed relationship to the clamp frame, said toothed rack defining a linear arrangement of rack teeth arranged in a direction parallel to the first and/or second clamp arms;
a mounting block arranged for fixing to the second clamping element and for linear travel relative to the clamp frame in said direction parallel to the first and/or second clamp arms, said mounting block provided with a through hole;
a bar with a threaded portion, said bar arranged for receipt by said through hole of the mounting block;
a toggle element arranged for threaded interaction with said threaded portion of the bar, said toggle element provided with one or more teeth arranged for locking engagement with said rack teeth of the toothed rack,
wherein, the bar is reversibly rotatable within the through hole of the mounting block such that the threaded portion thereof interacts with the toggle element to move the toggle element from a locked position to an unlocked position, in which the one or more teeth thereof disengage from locking interaction with the rack teeth of the toothed rack such as to enable movement of the mounting block relative to the clamp frame.
Thus, there is provided a lock and release mechanism arranged for use with the clamp herein, but also more generally applicable to other clamp forms.
The mechanism comprises a toothed rack, provided in fixed relationship to the clamp frame. The toothed rack defines a linear arrangement of rack teeth arranged in a direction parallel to the first and/or second clamp arms. In embodiments, the toothed rack is provided to a plate or block that fixes to the clamp frame. In other embodiments, the toothed rack is provided integral with the clamp frame.
The mechanism also comprises a mounting block arranged for fixing to the second clamping element and for linear travel relative to the clamp frame in the direction parallel to the first and/or second clamp arms. Typically, the clamp frame is provided with a guide channel or other guide means to guide the linear travel of the mounting block relative to the clamp frame. The mounting block provided with a through hole, the size and shape of which is determined by its function to receive the threaded bar, as described below.
Thus, the mechanism further comprises a bar with a threaded portion, arranged for receipt by the threaded through hole of the mounting block for rotation therein. The threaded bar may have any suitable shape or form, but most typically has a circular cross-section. In embodiments, the threaded portion locates at a position that is spaced from both ends thereof (i.e. at a position along the shaft of the bar). The bar and the mounting block are generally coupled such as to prevent relative linear motion (i.e. along the direction defined by the bar) therebetween. Suitable coupling elements in embodiments, comprise one or more washers. This coupling interaction between the bar and mounting block means that these two parts will move in a linear sense in unison with each other.
There is further provided a toggle element arranged for threaded interaction with said threaded portion of the bar. The toggle element provided with one or more teeth arranged for locking engagement with said rack teeth of the toothed rack.
The bar is reversibly rotatable within the through hole of the mounting block such that the threaded portion thereof interacts with the toggle element to move the toggle element from a locked position to an unlocked position, in which the one or more teeth thereof disengage from locking interaction with the rack teeth of the toothed rack such as to enable movement of the mounting block relative to the clamp frame. The end of the bar is typically provided with user-actuable handles such as to enable such rotation.
Thus, in a typical use operation the mechanism is initially in the locked position and the user grabs hold of the handle and rotates it such as to cause the one or more teeth of the toggle element to disengage from the rack teeth of the toothed rack. The mounting block may then move freely relative to the clamp frame such as to enable movement of the second clamping element fixed directly or indirectly thereto to a desired clamping position. The user then rotates the handle in the opposite sense such as to again bring the one or more teeth of the toggle element into locking engagement with the rack teeth of the toothed rack, thereby locking the second clamping element into that clamping position.
In embodiments, there is provided slight biasing (e.g. a light spring) between the mounting block and the bar. Such biasing may assist the teeth to again come into locking interaction at the desired clamping position.
In embodiments, one lock and release mechanism is provided for each of the first and second clamp arms of the clamp.
The clamp herein may be used in conjunction with a frame assembly for a workbench that is readily and reversibly foldable from an in-use to a folded configuration. The frame assembly is desirably supplemented with one or more bench and/or utility features such as to provide the full workbench. One suitable frame assembly and workbench is described in PCT Patent Application No. WO2007/065,919 .
The frame assembly comprises a central spine. The central spine is in embodiments rigid and locates about the central folding axis of the frame assembly. In embodiments, the central spine has an elongate rectangular (e.g. box form), elongate open rectangular (e.g. open box form) or elongate cylindrical (e.g. tubular) form. For compactness of folding, the distinct hinge mountings preferably locate inboard of the central spine (e.g. within the space defined by planes defined by the literal extent of the central spine). In embodiments, the central spine defines a rectangular top surface (e.g. a plate),
which in the in-use configuration preferably defines a central part of the work surface of the workbench.
The frame assembly further comprises first and second primary work surface frames suitable for receipt and / or definition of first and second primary work surfaces. In embodiments, the first and second primary work surfaces are separately provided to their primary work surface frames, to which they are secured by suitable securing means (e.g. screw mounting, bracket fixing or slide / track mounting). In another aspect, the first and second primary work surface frames actually define the first and second primary work surfaces (i.e. integral frame structure).
Each work surface frame in embodiments has an inner edge, an outer edge and two side edges. Typically, the dimensions of the first and second work surfaces frames and edges thereof are selected to match each other. Each inner edge of the first and second work surface frames hingedly mounts to the central spine such that the primary work surface frames are foldable towards each other (i.e. as in the folded configuration).
The frame assembly is provided with at least two (i.e. first and second) opposing pairs of legs. Each leg pivotally mounts to one end (typically, the outer end) of an outer edge of the first and second primary work surface frames such that the legs of each opposing pair are foldable towards each other. In the in-use configuration, the legs extend generally downwards to typically provide a four leg supporting structure for the first and second primary work frames.
For additional stability, adjacent pairs of legs (i.e. those pairs of legs which mount to an identical outer edge of either the first or second primary work surface frames) are provided with a cross-brace. Preferably, both pairs of adjacent legs (of the four leg supporting structure) are cross-braced. In embodiments, the ends of the legs are provided with feet. Feet comprised of rubber or of a similar flexible or rubber-like material are preferable.
The inner edge of each of the first and second primary work surface frames hingedly mounts to the central spine by a distinct hinge mounting such that in the folded configuration, the side edges of the respective first and second primary work surface frames (i.e. opposing side edges) are brought parallel with each other and each of the legs is brought parallel with a side edge thereof. Preferably, in the folded configuration the (top surfaces of the) primary and second work surfaces rest flush with each other and the legs rest flush with the underside thereof.
Each primary work surface frames mounts to the central spine by a distinct (i.e. separate) hinge mounting. The distinct first and second hinge mountings are in embodiments arranged (e.g. in parallel fashion to each other) about the central spine such as to define first and second hinge axes that are parallel to and spaced apart slightly from each other. The relative spacing of the axes of the hinge mountings is selected to allow for compact folding of the frame assembly and in particular, for flush accommodation of the first and second primary work surfaces in the folded configuration. Typical hinge axis spacing may be from 5 to 500mm, preferably from 10 to 100mm (e.g. 30-40mm) apart. In embodiments, the first and second hinge axes lie below the central spine, for example below the rectangular top surface of the central spine.
In one example, for a hinge spacing of say 40mm, the first hinge locates on a first axis that is laterally spaced 20mm from but parallel to the central axis defined by the central spine and the second hinge locates on a second axis that is laterally spaced 40mm from the first axis, but also 20mm laterally from and parallel to the central axis defined by the central spine (i.e. one on either side of the central spine). Alternatives and equivalents to hinge mountings are envisaged herein including arrangements (e.g. series arrangements) of pivot mountings and other mechanical arrangements capable of providing hinge-like functionality. The spaced hinge mountings may either comprise separate hinges or alternatively, the hinges may be coupled in some way (e.g. by a coupling arm or geared link) including for example, by a compass type hinge.
Where the central spine defines a rectangular top surface (e.g. a plate) having major and minor rectangle edges, the hinge mountings preferably locate inboard of (i.e. within the leading edges, which is to say major edges, of) that rectangular top surface.
In embodiments, the frame assembly additionally comprises first and/or second subsidiary work surface frames, each respective subsidiary work surface frame pivotally mounting to an outer edge of the first and second primary work surface frames. In embodiments, in the folded configuration, each respective subsidiary work surface frame is brought parallel with its primary work surface frame. In embodiments, in the folded configuration, each respective subsidiary work surface frame is brought parallel with the legs.
The first and/or second subsidiary work surface frames are suitable for receipt and / or definition of first and second subsidiary work surfaces. Thus, in embodiments, the workbench additionally comprises first and/or second subsidiary work surfaces provided to the first and/or second subsidiary work surface frames. In embodiments, the first and second subsidiary surfaces are separately provided to their subsidiary work surface frames, to which they are secured by suitable securing means (e.g. screw mounting, bracket fixing or slide / track mounting). In another aspect, the first and second subsidiary work surface frames actually define the first and second subsidiary work surfaces (i.e. integral frame structure).
In embodiments, the workbench incorporates the clamp herein as an integral feature thereof. Thus, in embodiments the clamp frame of the clamp herein is wholly or partly defined by the first and/or second subsidiary work surface frame. Thus also, in embodiments the first clamping element and/or second clamping element of the clamp herein are wholly or partly defined by the first and/or second subsidiary work surface (i.e. as provided to the first and/or second subsidiary work surface frame).
A preferred configuration includes both first and second subsidiary work surface frames; although a less preferred configuration including only one subsidiary work surface frame is envisaged.
In embodiments, a trunk extends downwards from the central spine to define a trunk cavity. That is to say, the central spine is provided with a trunk having trunk walls that extends downwards (i.e. towards the floor) from the central spine, and generally a trunk base. The trunk typically reaches only part-ways to the floor when the workbench is in the 'in use' position. The trunk may extend downwards across the full length of the central spine or only from a part length thereof. In embodiments, the trunk has a box form or an open box form. In embodiments, the trunk is integrally formed with the central spine. Use of a trunk extending to only a part length of the central spine is preferable to allow for accommodation of the user's legs when seated at the workbench.
In embodiments, the distinct hinge mountings locate inboard of the trunk (i.e. within the space defined by planes defined by the downwardly extending walls of the trunk). In embodiments, the first and second hinge axes of the distinct hinge mountings lie within the upper part (i.e. that part closest to the central spine and furthest from the trunk base) of the trunk.
In embodiments, in the folded configuration the trunk locates directly underneath the first and second primary work surfaces and frames. This assists with compact stowage of the trunk.
In embodiments, the width of the trunk approximates to the combined thickness of the first and second primary work surface frames, and their respective first and second work surfaces, when brought together in the folded configuration. Again, this assists with compact stowage of the trunk. In embodiments, the length of downward extent of the trunk added to the length of one of the side edges of the first and second primary work surface frames equates to less than or approximately equal to the length of one of the legs.
Most preferably, in the folded configuration the trunk locates directly underneath the first and second primary work surface frames and the combined length of these elements is roughly equal to (i.e. only slightly more than or less than) that of the legs. Thus, in essence, the length of the legs defines the maximum extent of the compact folded configuration and the width thereof is only slightly greater than the combined width of the opposing legs and thicknesses of the work surfaces (as lie side-by-side each other).
In embodiments, the frame assembly is provided with struts that pivotally connect the lower part (i.e. closest to the floor) of the trunk to each of the respective legs such that in the in-use configuration the struts define a tray framework for receipt of a tray. That is to say, in the in-use configuration the struts preferably define a flat / level framework suitable for optional receipt of a tray or other flat surface.
In embodiments, leg cross-struts are also provided to adjacent legs, each leg cross-strut running parallel to the outer edge of one of the first and second primary work surface frames. In embodiments, the leg cross-struts further define the framework for receipt of a tray.
The trunk is in embodiments shaped to define an inner trunk cavity for storage of tools and/or receipt of utility equipment (e.g. electrical plug socketry or cable storage).
In embodiments, the frame assembly additionally comprises first and second couplings that act to respectively couple said trunk to the underside of each of the first and second subsidiary work surface frames. Preferably, each of said first and second couplings acts such as to move (e.g. push and/or pull) the respective underside of each of the first and second subsidiary work surface frames parallel with the respective underside of each of the first and second primary work surface frames on folding of the frame assembly from the in-use to the folded configuration. Preferably, also each of said first and second couplings acts such as to push each of the first and second subsidiary work surface frames to their in-use position on unfolding of the frame assembly from the folded to in-use configuration. Most preferably, the couplings provide both push and pull function. In embodiments, each of said couplings comprises a coupling arm, preferably a rigid strut. In embodiments, each of said couplings shares a common pivot with the trunk mounted pivot of the trunk to leg strut.
In embodiments, each of said couplings is provided with a safety catch, which acts to prevent uncontrolled (or e.g. accidental) folding of the frame assembly of the workbench.
In embodiments, for each coupling the safety catch comprises a latch arm, which pivotally mounts to the underside of the relevant subsidiary work surface frame (or in alternatives, to the underside of the relevant subsidiary work surface itself); said latch arm provided with at least a first latch element (e.g. a cutaway portion or slot) for latching interaction with a first latch pin provided to the coupling when the workbench is in the in-use configuration. In embodiments, that latching interaction is also enabled when the workbench is in a part-folded configuration, and the latching interaction must be broken to enable full folding of the workbench.
In embodiments, the latch arm is additionally provided with a second latch element (e.g. a cutaway portion or slot) for latching interaction with a second latch pin provided to the underside of the relevant primary work surface frame when the workbench is in the folded configuration.
In embodiments, a pair of such latch arms is provided, each of which pivotally mounts to the underside of the relevant subsidiary work surface frame (or in alternatives, to the underside of the relevant subsidiary work surface itself). Preferably, the pair of latch arms pivotally mounts about a common pivot mounting axis.
In embodiments, the or each latch arm is provided with an actuator arm (e.g. in the form of a horizontally extending rod), which actuator arm is arranged for ease of latching / delatching by the user. Where a pair of latch arms, each with an actuator arm is present, the pair of actuator arms preferably shares the same axis when the pair of latch arms is in the latched and/or fully unlatched positions. The actuator arms are movable independently.
In embodiments, the frame assembly additionally includes one or more supports, which are provided to support either the first or second subsidiary work surface frames. In embodiments, the one or more supports extend in supporting fashion to the first and / or second subsidiary work surface frames from one or more of the legs or from any leg cross-struts provided thereto. Preferably, each of the one or more supports comprises a snap-link (e.g. rod with snap-linkage or sliding latch) provided with a lock for locking said link in a rigid position.
In embodiments, one support pivotally connects to each of the legs (i.e. for a four-legged frame assembly there are also four supports, preferably one extending to each corner of the unfolded workbench).
In embodiments, that support-to-leg pivotal connection is shared (i.e. in common with) the strut-to leg pivotal connection that connects the aforementioned struts to their respective legs. As described above, the struts extend to a lower part (i.e. closest to the floor) of the trunk to define a tray framework.
In embodiments, the frame assembly additionally comprises first and second sprung couplings, which act to respectively couple said trunk to the underside of each of the first and second primary work surface frames. The sprung couplings act such as to provide a degree of resistance to folding (and hence control and safety) when the workbench is folded up and provide a degree of spring assist when the workbench is unfolded.
In embodiments, the frame assembly is symmetrical about the central spine. For strength and compactness symmetry is generally preferable in the overall frame assembly structure and in the arrangement of the component parts (e.g. work surfaces, couplings, struts and supports). In embodiments however, the frame assembly also provides for an asymmetric mode of operation, in which one half of the workbench is folded and wall-mounted and the other half extended.
According to another aspect of the present invention there is provided a workbench comprising a frame assembly as described hereinabove; and first and second primary work surfaces provided to the first and second primary work surface frames.
In embodiments, the workbench additionally comprises first and/or second subsidiary work surfaces provided to the first and/or second subsidiary work surface frames.
In embodiments, the central spine defines a rectangular top surface (e.g. a plate), that in the in-use configuration preferably rests essentially co-planar with (or slightly below) the first and second primary work surfaces to define a central work surface of the workbench.
Preferably, the width of the minor edge of the rectangular top surface of the central spine corresponds essentially to the combined width of the first and second primary work surface frames and their respective first and second work surfaces, when brought together in the folded configuration. In other words, the width of the minor edge of the rectangular top surface of the central spine defines the flush, folded width of the first and second primary work surface frames and their respective first and second work surfaces.
On folding, the first and second primary work surface frames are in embodiments brought towards each other, passing over the central spine (e.g. top surface thereof) and meeting essentially flush alongside the central axis defined by the central spine, thereby providing maximum compactness of the folded configuration.
Preferably, in the folded configuration the (top surfaces of the) first and second primary work surfaces rest essentially flush with each other, and preferably the legs rest flush with the underside (i.e. bottom surfaces) of the first and second primary work surfaces. Preferably, in the folded configuration, the legs rest flush with the underside of the first and second primary work surfaces. In embodiments, the first and second subsidiary work surfaces are provided with an access hole to enable the user to access (and thereby, actuate) the actuator arm(s) of any latch arm(s) provided to the underside thereof.
In embodiments, the workbench additionally comprises an optional tray provided to the tray framework.
The frame assembly and workbench herein may be supplied fully assembled or in any suitable kit of parts form. There is also provided the use of the workbench herein in its folded and/or in-use configuration.
In one particular use configuration, one half of the work bench mounts to an external vertical surface (e.g. a wall) in folded configuration and the other half of the work bench is unfolded to its in-use configuration. Thus, the workbench may also be supplied as a kit of parts with an optional wall mounting.
The frame assembly and workbench herein has been described in relation to embodiments comprising both first and second primary work surface frames. A less preferred configuration comprising only 'one half' of the present workbench, and thus comprising only one primary and subsidiary work surface frame (and typically, one pair of legs associated therewith) is however, also envisaged. It will be appreciated that in one embodiment such 'one half configuration would be suitable exclusively for use in the wall-mounted configuration. In another embodiment supporting legs (e.g. permanent, bolted on or flipped down) are provided to the underside of the trunk of the 'one half' configuration such that in use, the 'one half' workbench would be supported by these trunk-mounted legs (i.e. instead of the wall-mounting) and the pair of legs associated with the one primary and subsidiary work surface frame.
Embodiments of the present invention will now be described with reference to the accompanying drawings in which:

Figures 1a to 1d show perspective views of a first folding workbench suitable for use with the clamp herein in various stages as the workbench is folded up from the normal 'in-use' configuration (Figure 1a) to the 'folded' configuration (Figure 1d);
Figure 2 shows a perspective view of a clamp for use with a workbench herein shown in the clamp closed position;
Figure 3 shows a perspective view of the clamp of Figure 2 with the movable clamping work surface thereof removed;
Figures 4a and 4b show first and second perspective views of the clamp of Figure 2 provided to a workbench, wherein that workbench is shown in part view and in a part-folded up configuration;
Figure 5 shows a side view of the workbench with clamp of Figures 4a and 4b;
Figure 6 shows a perspective view of the workbench with clamp of Figures 4a and 4b, wherein that workbench is shown in part view and in a use configuration and the clamp is in a first clamp open position;
Figures 7a and 7b show side views of the workbench with clamp of Figures 4a and 4b, wherein that workbench is shown in part view and in a use configuration and the clamp is respectively in a clamp closed and first clamp open position; Figure 8 shows a side view of the workbench with clamp of Figures 4a and 4b, wherein that workbench is shown in part view and in a use configuration and the clamp is in a first clamp open position and receives a work-piece;
Figure 9 shows a side view of the workbench with clamp of Figures 4a and 4b, wherein that workbench is shown in part view and in a use configuration and the clamp is in a second clamp open position;
Figure 10 shows a side view of the workbench with clamp of Figures 4a and 4b, wherein that workbench is shown in part view and in a use configuration and the clamp is in a second clamp open position and receives a work-piece;
Figure 11 shows a perspective view of the clamp of Figure 2 with the movable clamping work surface thereof removed and also with top plates on the clamp frame arm removed to show details of the quick release mechanism thereof;
Figure 12 shows a top view of a detail of the clamp of Figure 2 with the movable clamping work surface thereof removed and also with top plates on the clamp frame arm removed to show details of the quick release mechanism thereof; and
Figures 13a and 13b shows different perspective views of the quick release mechanism of Figure 11.

Referring now to the drawings, in Figures 1a to 1d there is shown a first folding workbench 1 that may be modified as described hereinafter for use with the clamp herein. The workbench 1 is shown in various stages as the workbench is folded up from a normal 'in-use' configuration (Figure 1a), in which the workbench rests on the floor, to a normal 'folded' configuration (Figure 1d). For simplicity of reference, not all Figures are labelled with all number labels.
In more detail, the workbench 1 comprises a rigid central spine 10, defining first and second spaced hinge mountings 12, 14 arranged in parallel fashion. First and second primary work surfaces 20, 22 attached to first and second primary work surface frames 19, 21 hingedly mount to the central spine 10 via said first and second hinge mountings 12, 14. The central spine 10 is provided with a top surface 11 in the form of a rectangular plate, which in this (i.e. in the in-use) configuration is essentially co-planar with the top surfaces of the first and second primary work surfaces 20, 22. It will be noted that the hinge axes defined by the hinge mountings 12, 14 are parallel to each other and to a central axis defined by the central spine 10 and lie below the plane of the rectangular plate 11.
Each work surface frame has an inner edge 23, 24, an outer edge 25, 26 and two side edges 27a, 27b; 28a, 28b. It may be seen that it is the inner edge 23, 24 of each primary work surface frame 19, 21 that hingedly mounts to the central spine 10 such that the primary work surface frames 19, 21 (and their respectively supported work surfaces 20, 22) are foldable towards each other.
As a point of detail, it is noted that each hinge mounting 12, 14 for the primary work surface frames 19, 21 locates approximately 20mm away from the centre line of the workbench 1 to allow the frame 19, 21 to rotate clear of the central spine 10 and allow the primary work surfaces 20, 22 to meet flush along the centre line.
The workbench additionally comprises two opposing pairs of legs 30a, 30b; 32a, 32b. Each leg 30a, 30b; 32a, 32b mounts via pivot mounting 34b, 36b to one end of the outer edge 25, 26 of the first and second primary work surface frames 19, 21 such that the legs of each opposing pair 30a, 30b; 32a, 32b are foldable towards each other.
The workbench 1 also includes first and second subsidiary work surface frames 39, 41, which support first and second subsidiary work surfaces 40, 42. Second subsidiary work surface frame 41 pivotally mounts directly to outer edge 26 of the second primary work surface frame 21. First subsidiary work surface 40 mounts via slide track mounting to first subsidiary work surface frame 39, which then pivotally mounts to outer edge 25 of the first primary work surface frame 19. The first subsidiary mount surface 40 is movable on its slide track mounting by the action of turn handles 44, 45. It may also be seen that trunk 16 extends downwards from the central spine 10. The trunk 16 defines an inner cavity for receipt of electrical socketry 17 and also cabling, tools etc.
As a point of detail, it is noted that the exact positioning of the pivot mountings for the subsidiary work surface frames 39, 41 lies about 10mm below the corresponding edge of the frame 39, 41.
Struts 50a, 52a, 50b 52b pivotally connect the underside of the trunk 16 to each of the respective legs 30a, 30b; 32a, 32b such that in the in-use configuration the struts 50a, 52a, 50b 52b define a tray framework for receipt of storage tray 54. Leg cross-struts 56, 58 are also provided to adjacent legs 30a, 30b and 32a, 32b respectively, each leg cross-strut 56, 58 running parallel to the respective outer edge 25, 26 of one of the first and second primary work surface frames 19, 21. The leg cross-struts 56, 58 provide further support for the tray 54.
The workbench 1 also comprises first and second coupling arms 60, 62 that act to respectively couple trunk 16 to the underside of each of the first and second subsidiary work surface frames 39, 41.
As may be seen with particular reference to Figures 1b and 1c, during folding the first and second couplings 60, 62 act such as to pull the respective underside of each of the first and second subsidiary work surface frames 39, 41 parallel with the respective underside of each of the first and second primary work surface frames 19,21.
Two supports 70, 71 are provided to support the first subsidiary work surface frame 39 in the in-use configuration. These two supports 70, 71 extend upwards from adjacent pair of legs 30b, 30a. Similarly, two supports 72, 73 are provided to support the second subsidiary work surface frame 41 in the in-use configuration. Again, these two supports 72, 73 extend upwards from adjacent pair of legs 32b, 32a.
Each of the supports 70-73 comprises a snap-link provided with a lock for locking said link to provide rigid support when the first and second subsidiary work surface frames 39, 41 are in the in-use configuration.
First and second sprung couplings 80, 82 act to respectively couple trunk 16 to the underside of each of the first and second primary work surface frames 19, 21. These sprung couplings 80, 82 act such as to provide a degree of resistance to folding (and hence control and safety) when the workbench 1 is folded up and provide a degree of spring assist when the workbench 1 is unfolded.
Referring in particular to Figure 1d it may be seen that in the folded configuration the outer edges 25, 26 of the respective first and second primary work surfaces 20, 22 rest flush with each other and each of the legs 30b, 32b (only two visible in Figure 1d) rests flush with a side edge 27b, 28b (again, only two visible in Figure 1d) thereof.
Also, in the folded configuration, each respective subsidiary work surface frame 39, 41 rests parallel with its primary work surface frame 19, 21 and flush with the relevant legs 30a, 30b, 32a, 32b. The trunk 16 locates directly underneath the first and second primary work surfaces 20, 22. It may be seen that the combined length of the trunk 16 add to the length of one of the side edges 27b, 28b of the first and second primary work surfaces 20,22 amounts to just less than the length of one of the legs 30b, 32b.
It may be appreciated that the overall form of the workbench 1 is generally symmetrical about the central spine 10. Such symmetry is desirable from the standpoint of ease and stability of use, particularly during folding and unfolding of the workbench 1. It is however, also a feature of the workbench 1 herein that it may be used in an asymmetrical mode of operation in which it is used in combination with a wall mounting suitable for mounting one half of the workbench in its folded configuration whilst the other half is in the in-use configuration.
The workbench 1 of Figures 1a to 1d may be modified to allow for the provision of a clamp herein for reversible clamping of a wooden plank or other item to be worked on. A clamp herein is now described in particular relation to its use with such a modified workbench 1 herein, although it may be appreciated that the form of the clamp makes it amenable for use with other forms of workbench also.
Referring now to Figures 2 and 3, there is shown a clamp herein that is integrally incorporated as part of a modified workbench 101 as shown in Figures 4a to 6. The clamp comprises a first clamp frame part 139 and a second clamp frame part 139a movable relative thereto. The first clamp frame part 139 defines first 137a and second 137b frame arms arranged in spaced parallel relationship relative to each other with cross-pieces 138a, 138b therebetween. The first clamp frame part 139 is provided with a first longitudinal clamp element 146 defining a first clamping surface 147. The second clamp frame part 139a is provided with support elements 195a-d that receive and support a second planar clamp element 140 (that also mainly defines the first subsidiary work surface 140 of the workbench) defining a second opposing clamping surface 148. Bolts 196a-d (see Figure 11) may be used to fix the second planar clamp element / first subsidiary work surface 140 to the support elements 195a-d. The first clamp element 146 is in fixed relationship relative to the first clamp frame part 139. The second clamp element 140 is in fixed relationship relative to the second clamp frame part 139a.
Referring now also to Figures 7a to 10, the second clamp frame part 139a and second clamp element 140 are movable relative to the first clamp frame part 139 in the direction of the first 137a and second 137b frame arms from a clamp closed position to a clamp open position, in which the first 147 and second 148 clamping surfaces are spaced relative to each other to define an open clamp jaw 149 therebetween. Each of the first 137a and second 137b frame arms of the first clamp frame part 139 includes a well- form portion 190a, 190b that is positioned in a clamp open position (e.g. of Figures 6 or 9) to line up with the open clamp jaw 149 such as to form a well-form bottom support thereto.
Referring now in particular, to Figures 4a, 4b and 5 the workbench 101 having first and second 120, 122 primary work surfaces may be seen to be foldable into a folding configuration (only one side shown folded), in which the first clamping element 146 and second clamping element 140 (i.e. first subsidiary work surface) rests parallel with its primary work surface 120 and flush with the relevant legs 130a, 130b. It may be seen that the primary work surface 120 is provided with slots 164a, 164b that are arranged in the folded-up configuration to receive the bottom edge 192a, 192b of each well- portion 190a, 190b of the clamp arms 137a, 137b. Thus, the well- portions 190a, 190b may be accommodated in the workbench 101 design without in any way compromising its ability to fold up compactly into the folded-up configuration.
Referring now in particular to Figures 7a to 10, it may be noted that movement of the second clamp frame part 139a and second clamp element 140 from the clamp open to clamp closed positions is responsive to user movement of the clamp handles 144, 145.
Thus, responsive to user movement of the clamp handles 144, 145 the second clamp frame part 139a and second clamp element 140 are movable relative to the first clamp frame part 139 from a clamp closed position (e.g. of Figure 7a) to a clamp open position, in which the first 147 and second 148 clamping surfaces are spaced relative to each other to define an open clamp jaw 149 therebetween. As shown in Figures 6, 7a and 9, in clamp open positions the well- form portions 190a, 190b of the first 137a and second 137b frame arms of the first clamp frame part 139 line up with the open clamp jaw 149 such as to form a well-form bottom support thereto. Thus, the well- form portions 190a, 190b allow for the ready and deep receipt of various sizes and shapes of workpiece 185 as shown at Figures 8 and 10.
It may be appreciated that in Figures 7b and 8, the axial extent (i.e. in the axial direction defined by the clamp arms 137a, 137b) of the well- form portions 190a, 190b corresponds to the open extent of the open clamp jaw 149, but that in Figures 9 and 10 the axial extent of the well- form portions 190a, 190b is somewhat less than that maximum open clamp jaw 149 extent.
In embodiments, a quick lock and release mechanism is provided to the clamp and/or workbench. Such a quick lock and release mechanism is now described by reference to Figures 11 to 13b.
Thus, each frame arm 137a, 137b of the first clamp frame part 139 of Figures 11 and 12 is provided with a quick lock and release mechanism, which for succinctness is only described in relation to that mechanism provided to the first frame arm 137a. It will be noted that Figure 11 corresponds to Figure 3 save that the cover plate 191a, 191b for the quick lock and release mechanism has been removed.
The mechanism comprises a plate 175 defining a toothed rack 176, which plate 175 is fixed to the first clamp frame part 139. The toothed rack 176 defines a linear arrangement of rack teeth 177 arranged in a direction parallel to the first 137a and second 137b clamp arms. A mounting block 184 arranged for fixing to the first subsidiary work surface 140, which defines the second clamping element 140 is provided and sits in a guide channel 185. The guide channel 185 is arranged to guide linear travel of the mounting block 184 relative to the first clamp frame part 139 in the direction parallel to the first 137a and second clamp 137b arms.
The mounting block 184 is provided with first and second mounting block parts 186a, 186b wherein each is provided with a through hole 187a, 187b for receipt of bar 188 such that the bar 188 is rotatable within these through holes 187a, 187b. Washer elements are also provided (not visible), which restrict any linear (i.e. in a direction along the frame arms 137a, 137b) relative movement of the bar 188 relative to the block parts 186a, 186b of the mounting block 184. Thus, the bar 188 and parts 186a, 186b of the mounting block 184 will move in unison. The bar 188 is provided with a threaded portion 188a arranged for threaded interaction with a toggle block 194 that is itself provided with plural teeth 189. In other embodiments, the toggle block 194 is provided with just a single tooth 189. Those plural teeth 189 are arranged for locking engagement with the rack teeth 177 of the toothed rack 176. The end of the bar 188 with threaded portion 188a is shaped for receipt of a user-acuated handle 144.
The bar 188 with threaded portion 188a is freely rotatable within the through holes 187a, 187b of the mounting block 184 to allow threaded relative movement of the toggle block 194 from a locked position, in which the plural teeth 189 thereof engage in locking interaction with the rack teeth 177 of the toothed rack 176 such as to prevent linear movement of the bar 188 and mounting block 184 relative to the first clamp frame part 139, to an unlocked position, in which the plural teeth 189 thereof disengage from locking interaction with the rack teeth 177 of the toothed rack 176 such as to enable linear movement of the bar 188 and mounting block 184 relative to the first clamp frame part 139 in the direction of the guide channel 185.
In a typical use operation the mechanism is initially in the locked position and the user grabs hold of the handle 144 and rotates the bar 188 such as to cause the plural teeth 189 of the toggle block 194 to disengage from the rack teeth 177 of the toothed rack 176. The bar 188 and mounting block 184 may then move freely in a linear sense relative to the first clamp frame part 139 such as to enable linear movement of the second frame part 139a and second clamping element 140 fixed thereto to a desired clamping position. The user then rotates the handle 144 in the opposite sense such as to again bring the plural teeth 189 of the toggle block 194 into locking engagement with the rack teeth 177 of the toothed rack 176, thereby locking the second frame part 139a and second clamping element 140 into that clamping position. Further rotation of the handle 144 causes the bar 188 and therefore also the mounting block 184 to move relative to the toggle element 194 such as to exert a clamping pressure.
In embodiments, a light spring is provided between the toggle block 194 and the bar 188. Such biasing may assist the toggle element 194 to rotate with the threaded bar 188 upon actuation of the handle.
For the avoidance of doubt, it is noted that wherever reference herein is made to 'pivot mounting', 'pivotally mounting', pivotally connecting' and the like, what is envisaged is both classic pivot forms typically comprising pivot pins and associated bushes and washers, and any functional equivalents thereto such as pivot assemblies that comprise interlocking parts that provide the required pivot movement.
it is noted that wherever reference herein is made to 'hinge mounting', 'hingedly mounting', hingedly connecting' and the like, what is envisaged is both classic hinge forms and any functional equivalents thereto such as hinge assemblies that comprise interlocking parts that provide the required hinge movement.

Claims

A clamp for use with a workbench (101) comprising a clamp frame defining first and second frame arms (137a,137b) arranged in spaced parallel relationship relative to each other; provided to the clamp frame, a first clamp element (146) defining a first clamping surface (147) and a second clamp element (140) defining a second clamping surface (148), wherein the first clamp element (146) is in fixed relationship relative to the clamp frame and the second clamp element (140) is movable relative to the clamp frame In the direction of the first and second frame arms (137a,137b) from a clamp closed position, in which the first and second clamping surfaces (147,148) are unspaced relative to each other to define a closed clamp jaw therebetween, to a clamp open position, in which the first and second clamping surfaces (147, 148) are spaced relative to each other to define an open clamp jaw (149) therebetween, characterized in that each of the first and second frame arms (137a, 137b) of the clamp frame includes a well-form portion (190a, 190b) that is positioned in the clamp open position to line up with said open clamp jaw (149) such as to form a well-form support thereto.
A clamp according to claim 1, characterized in that each of the first and second frame arms (137a, 137b) is straight and elongate in form.
A clamp according to either of claims 1 or 2, characterized in that the clamp frame is provided with one or more cross-pieces (138a, 138b) between the first and second frame arms (137a, 137b).
A clamp according to claim 3, characterized In that the clamp frame has a rectangular frame structure and the first and second clamp arms (137a, 137b) comprise opposing sides thereof.
A clamp according to any of claims 1 to 4, characterized in that the first and second clamping surfaces (147, (148) are planar surfaces and arranged in opposing relationship to each other.
A clamp according to any of claims 1 to 5, characterized in that the first clamp element (146) fixes to the clamp frame by means of one or more fixing elements.
A clamp according to any of claims 1 to 5, characterized in that the first clamp element (146) and the clamp frame are integrally comprised.
A clamp according to any of claims 1 to 7, characterized in that the clamp addidonally comprises a mounting between the second clamp element (140) and the clamp frame.
A clamp according to any of claims 1 to 8, characterized in that the well-portion of the first and/or second clamp arms (137a, 137b) is provided as a well-shaped cut-out thereto.
A clamp according to any of claims 1 to 9, characterized in that the well-form portion (190a, 190b) is correspondingly located for each of the first and second frame arms (137a, 137b).
A clamp according to any of claims 1 to 10, characterized in that the well-portion (190a, 190b) of the first and/or second clamp arms (137a, 137b) defines a flat base.
A clamp according to any of claims 1 to 11, characterized in that the well-portion of the first and/or second clamp arms (137a, 137b) defines flat side walls.
A clamp according to claim 12, characterized in that said flat side walls extend vertically.
A clamp according to any of claims 1 to 13, characterized in that the well-form portions (190a, 190b) the first and second frame arms (137a, 137b) in combination define a support channel for supported receipt of a workpiece.
A clamp according to any of claims 1 to 14, characterized in that movement of the second clamping element (140) relative to the clamp frame is under the action of a movement control mechanism.